HEIGHT-ADJUSTABLE DESK

Abstract

A height-adjustable desk includes a base, a desk board assembly, a support arm assembly and a supporter. The desk board assembly is above the base, and the support arm assembly is a rhombic linkage mechanism. The support arm assembly includes a first arm segment, a second arm segment, a third arm segment and a fourth arm segment. Bottom ends of the first and second arm segments rotatably connect with the base, and top ends of the third and fourth arm segments rotatably connect with the desk board assembly. A top end of the first arm segment rotatably connects with a bottom end of the third arm segment, and a top end of the second arm segment rotatably connects with a bottom end of the fourth arm segment. The first and second arm segments, and the third and fourth arm segments connect in an engaging transmission manner, respectively.

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application the benefit of Chinese Application No. 202322329424.X, filed Aug. 28, 2023, entitled HEIGHT-ADJUSTABLE DESK, the entirety of which is incorporated herein by reference.

FIELD

The present disclosure relates to the technical field of furniture, in particular to a height-adjustable desk.

BACKGROUND

A height-adjustable desk in related art realizes a height adjustment of a desk board through an X-shaped support arm assembly. For example, the height-adjustable desk includes a base, a desk board and a support arm assembly. The support arm assembly includes two support arms which rotatably connect with and cross each other, so that the support arm assembly is X-shaped. Atop end of the support arm rotatably connects with a bottom of the desk board, and a bottom end of the support arm rotatably connects with the base. The top end of one support arm is capable of horizontally sliding relative to the desk board, and the bottom end of another support arm is capable of horizontally sliding relative to the base. As a distance between the desk board and the base changes, an included angle between the two support arms also changes accordingly.

However, when the desk board is in a higher position, the stability of height-adjustable desk is not good. For example, as the desk board ascends, the top end of the one support arm slides to the left, and the bottom end of the another support arm slides to the left too, so that the support arm assembly mainly supports a left half of the desk board, and a right half of the desk board is suspended. In this state, if a heavy object is placed on the right half of the desk board, the height-adjustable desk is easy to fall down.

SUMMARY

A height-adjustable desk is disclosed in the present disclosure.

According to embodiments of the present disclosure, the height-adjustable desk includes: a base; a desk board assembly above the base; a support arm assembly, which is a rhombic linkage mechanism; and at least one supporter. The support arm assembly includes a first arm segment, a second arm segment, a third arm segment and a fourth arm segment. Both a bottom end of the first arm segment and a bottom end of the second arm segment rotatably connect with the base. Both a top end of the third arm segment and a top end of the fourth arm segment rotatably connect with the desk board assembly. A top end of the first arm segment rotatably connects with a bottom end of the third arm segment. A top end of the second arm segment rotatably connects with a bottom end of the fourth arm segment. The bottom end of the first arm segment and the bottom end of the second arm segment connect in an engaging transmission manner, and the top end of the third arm segment and the top end of the fourth arm segment connect in an engaging transmission manner. One end of the at least one supporter connects with the base, and another end of the at least one supporter connects with the desk board assembly. The at least one supporter is capable of extending and retracting to adjust a distance between the desk board assembly and the base in a vertical direction, and is configured to support the desk board assembly to keep the distance between the desk board assembly and the base in the vertical direction.

According to some embodiments of the present disclosure, the supporter inclines relative to the vertical direction, a top end of the supporter rotatably connects with the desk board assembly, and a bottom end of the supporter rotatably connects with the base.

According to some embodiments of the present disclosure, the first arm segment and the second arm segment are arranged along a first horizontal direction, the third arm segment and the fourth arm segment are arranged along the first horizontal direction, the first arm segment and the second arm segment are symmetrically arranged based on a symmetry axis extending in the vertical direction, and the third arm segment and the fourth arm segment are symmetrically arranged based on the symmetry axis. In the first horizontal direction, the top end of the supporter and the bottom end of the supporter respectively locate at different sides of the symmetry axis.

According to some embodiments of the present disclosure, the desk board assembly includes a top frame and a desk board, where the third arm segment and the fourth arm segment rotatably connect with the top frame, the desk board fixedly connects with a top of the top frame, the top frame includes a first end, the top end of the supporter locates between the first end and the symmetry axis in the first horizontal direction, a distance between the first end and the symmetry axis in the first horizontal direction is L₁, and a distance between the top end of the supporter and the symmetry axis in the first horizontal direction is L₂, where ⅓L₁≤L₂≤⅔L₁. The base includes a second end, the second end and the first end respectively locate at different sides of the symmetry axis in the first horizontal direction, the bottom end of the supporter locates between the second end and the symmetry axis, a distance between the second end and the symmetry axis in the first horizontal direction is L₃, and a distance between the bottom end of the supporter and the symmetry axis in the first horizontal direction is L₄, where

$\frac{1}{3}{L}_3\le L_4\le \frac{2}{3}{L}_3.$

According to some embodiments of the present disclosure, a plurality of supporters are provided.

According to some embodiments of the present disclosure, the first arm segment and the second arm segment are arranged along the first horizontal direction, and a second horizontal direction is perpendicular to the first horizontal direction. The top end of the supporter rotatably connects with the desk board assembly, the bottom end of the supporter rotatably connects with the base, the top end and the bottom end of the supporter are arranged at intervals along the first horizontal direction, a plurality of supporters are arranged at intervals along the second horizontal direction.

According to some embodiments of the present disclosure, any two supporters are parallel to each other, alternately, any two adjacent supporters are arranged in a crossed way.

According to some embodiments of the present disclosure, the first arm segment is provided with a first groove; and/or the second arm segment is provided with a second groove; and/or the third arm segment is provided with a third groove; and/or the fourth arm segment is provided with a fourth groove.

According to some embodiments of the present disclosure, the first arm segment and the second arm segment are arranged along a first horizontal direction, and a second horizontal direction is perpendicular to the first horizontal direction. A plurality of support arm assemblies are arranged at intervals along the second horizontal direction.

According to some embodiments of the present disclosure, the height-adjustable desk further includes at least one connecting bar, and at least one group of two first arm segments, two second arm segments, two third arm segments and two fourth arm segments of two adjacent support arm assemblies connects with the at least one connecting bar.

Additional aspects and advantages of the present disclosure will be set forth in part in the following description, and in part will become obvious from the following description, or may be learned through the practice of the present disclosure.

BRIEF DESCRIPTION OF DRAWINGS

The present disclosure will be further explained with the accompanying drawings and embodiments, in which:

FIG. 1 is a front view of a support of a height-adjustable desk in related art;

FIG. 2 is a schematic view of the height-adjustable desk in a first embodiment of the present disclosure;

FIG. 3 is a schematic view of the height-adjustable desk in FIG. 2 after being switched to a folded state;

FIG. 4 is a schematic view of the height-adjustable desk in FIG. 2 without a desk board and a keyboard holder;

FIG. 5 is a front view of the height-adjustable desk in FIG. 4 without the desk board and the keyboard holder;

FIG. 6 is a front view of the height-adjustable desk in a second embodiment of the present disclosure without the desk board and the keyboard holder;

FIG. 7 is a schematic view of a support arm assembly in FIG. 4;

FIG. 8 is a schematic view of the support arm assembly in FIG. 4 from another angle;

FIG. 9 is a schematic view of a joint of a first arm segment and a second arm segment in some embodiments of the present disclosure;

FIG. 10 is a schematic view of a joint of a third arm segment and a fourth arm segment in some embodiments of the present disclosure;

FIG. 11 is a schematic view of the height-adjustable desk in a third embodiment of the present disclosure;

FIG. 12 is a front view of the height-adjustable desk in the third embodiment of the present disclosure;

FIG. 13 is a schematic view of a gear seat and the joint of the first arm segment and the second arm segment of the height-adjustable desk in the third embodiment of the present disclosure;

FIG. 14 is a schematic view of the height-adjustable desk in the third embodiment of the present disclosure.

REFERENCE NUMERAL

• • 100—height-adjustable desk, 101—desk board assembly, 102—desk board, 103—keyboard holder, 104—top frame, 105—support arm assembly, 106—supporter, 107—connecting bar, 108—base, 109—control handle;
  • 201—first arm segment, 202—second arm segment, 203—third arm segment, 204—fourth arm segment, 205—first connecting bar, 206—gas spring, 207—piston rod, 208—cylinder, 209—symmetry axis, 210—second connecting bar, 211—third connecting bar, 212—fourth connecting bar;
  • 301—first groove, 302—second groove, 303—third groove, 304—fourth groove, 305—first tooth, 306—second tooth, 307—third tooth, 308—fourth tooth, 309—first pivot, 310—second pivot, 311—third pivot, 312—fourth pivot;
  • 401—first support arm, 402—second support arm, 403—first chute, 404—second chute;
  • 501—first end, 502—second end;
  • 601—auxiliary link assembly, 602—slide rail, 603—pulley, 604—link rod;
  • 701A—bottom gear seat, 701B—top gear seat, 702A—first arc chute, 702B—second arc chute, 702C—third arc chute, 702D—fourth arc chute, 703A—first limit post, 703B—second limit post, 703C—third limit post, 703D—fourth limit post.

DETAILED DESCRIPTION

Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present disclosure, and cannot be understood as limitations of the present disclosure.

In the description of the present disclosure, it should be understood that the orientation or position relationship related to orientation description, such as up, down, front, back, left and right, is based on the orientation or position relationship shown in the accompanying drawings, only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present disclosure.

In the description of the present disclosure, several means more than one, and a plurality of means more than two. Terms such as “greater than”, “less than”, “exceeding”, etc. are understood as excluding the number, while above, below and within are understood as including the number. If there is description to first and second, it is only for distinguishing technical features, and it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

In the description of the present disclosure, unless otherwise specified, the words such as installation, mount and connection should be broadly understood, and those skilled in the technical field can reasonably determine specific meanings of the above words in the present disclosure in combination with specific contents of the technical scheme.

FIG. 2 shows a height-adjustable desk 100 in the first embodiment of the present disclosure. The height-adjustable desk 100 includes a desk board assembly 101, a support arm assembly 105, a supporter 106 and a base 108. In this embodiment, the desk board assembly 101 includes a desk board 102 and a top frame 104. The desk board 102 is fixedly connected to a top of the top frame 104, and the top frame 104 is configured to connect with the support arm assembly 105 and the supporter 106. In other embodiments, the desk board assembly 101 may not include the top frame 104, and both the supporter 106 and the support arm assembly 105 are directly connected with a bottom of the desk board 102. The base 108 is configured to be placed on ground, a desktop (referring to a desktop of any other desks except the height-adjustable desk 100) or other surface that can bear the height-adjustable desk 100. The support arm assembly 105 is a rhombic linkage mechanism, and capable of being folded. After the support arm assembly 105 is folded, a state of the height-adjustable desk 100 is shown in FIG. 3, and a top surface of the desk board 102 is in a lower position. When the height-adjustable desk 100 is in the folded state shown in FIG. 3, a vertical distance between a top surface of the desk board assembly 101 (that is, the top surface of the desk board 102) and the base 108 is the smallest, and a volume and an occupied space of the height-adjustable desk 100 are small, so that the height-adjustable desk 100 in the folded state is convenient to store and transport.

FIG. 4 shows the support arm assembly 105 in FIG. 2. As shown in FIG. 4, the support arm assembly 105 includes a first arm segment 201, a second arm segment 202, a third arm segment 203 and a fourth arm segment 204. The first arm segment 201 and the second arm segment 202 are arranged along a first horizontal direction. The third arm segment 203 and the fourth arm segment 204 are also arranged along the first horizontal direction. In FIG. 4, the first horizontal direction is the left-right direction. A bottom end of the first arm segment 201 and a bottom end of the second arm segment 202 are rotatably connected with the base 108, and a top end of the third arm segment 203 and a top end of the fourth arm segment 204 are rotatably connected with the top frame 104. Atop end of the first arm segment 201 is rotatably connected with a bottom end of the third arm segment 203, and a top end of the second arm segment 202 is rotatably connected with a bottom end of the fourth arm segment 204. The rotational connection between the above components can be configured as pivot connection or hinge connection.

In this embodiment, the bottom end of the first arm segment 201 and the bottom end of the second arm segment 202 are connected with the base 108 through a pivot, respectively, and the bottom end of the first arm segment 201 and the bottom end of the second arm segment 202 are arranged along the first horizontal direction and are adjacent to each other. The top end of the third arm segment 203 and the top end of the fourth arm segment 204 are also connected with the desk board assembly 101 through a pivot, respectively, and the top end of the third arm segment 203 and the top end of the fourth arm segment 204 are arranged along the first horizontal direction and are adjacent to each other.

The bottom end of the first arm segment 201 and the bottom end of the second arm segment 202 are connected in an engaging transmission manner. As shown in FIG. 9, the first arm segment 201 includes a plurality of first teeth 305 and the second arm segment 202 includes a plurality of second teeth 306. FIG. 9 also shows a first pivot 309 and a second pivot 310 of the height-adjustable desk 100. The first arm segment 201 is connected with the base 108 through the first pivot 309, and the second arm segment 202 is connected with the base 108 through the second pivot 310. A central axis (not shown) of the first pivot 309 extends in a second horizontal direction (i.e., the front-back direction). If the central axis of the first pivot 309 is taken as a first axis, the first axis is a rotation axis of the first arm segment 201 when the first arm segment 201 rotates relative to the base 108. A central axis (not shown) of the second pivot 310 extends in the second horizontal direction. If the central axis of the second pivot 310 is taken as a second axis, the second axis is a rotation axis of the second arm segment 202 when the second arm segment 202 rotates relative to the base 108. The plurality of first teeth 305 are arranged around the first axis, and the plurality of second teeth 306 are arranged around the axis. The first teeth 305 and the second teeth 306 engage with each other.

Because the first teeth 305 and the second teeth 306 engage with each other, when the first arm segment 201 rotates an angle in a certain direction (for example, to the left), the second arm segment 202 rotates the identical angle in another direction (for example, to the right). The rotation of the first arm segment 201 and the rotation of the second arm segment 202 are symmetrical and synchronous, so as to beneficially prevent the desk board assembly 101 from being skewed due to asynchronous movements of the first arm segment 201 and the second arm segment 202.

Similarly, the top end of the third arm segment 203 and the top end of the fourth arm segment 204 connect in an engaging transmission manner. As shown in FIG. 10, the third arm segment 203 includes a plurality of third teeth 307 and the fourth arm segment 204 includes a plurality of fourth teeth 308. FIG. 10 also shows a third pivot 311 and a fourth pivot 312 of the height-adjustable desk 100. The third arm segment 203 is connected with the top frame 104 through the third pivot 311, and the fourth arm segment 204 is connected with the top frame 104 through the fourth pivot 312. A central axis (not shown) of the third pivot 311 extends in the second horizontal direction (i.e., the front-back direction). If the central axis of the third pivot 311 is taken as a third axis, the third axis is a rotation axis of the third arm segment 203 when the third arm segment 203 rotates relative to the desk board assembly 101. A central axis (not shown) of the fourth pivot 312 extends in the second horizontal direction. If the central axis of the fourth pivot 312 is taken as a fourth axis, the fourth axis is a rotation axis of the fourth arm segment 204 when the fourth arm segment 204 rotates relative to the desk board assembly 101. The plurality of third teeth 307 are arranged around the third axis, and the plurality of fourth teeth 308 are arranged around the fourth axis. The third teeth 307 and the fourth teeth 308 engage with each other. Because the third teeth 307 and the fourth teeth 308 engage with each other, the rotation of the third arm segment 203 and the rotation of the fourth arm segment 204 are symmetrical and synchronous, so as to beneficially prevent the desk board assembly 101 from being skewed due to the asynchronous movements of the third arm segment 203 and the fourth arm segment 204.

In addition, if an axis of rotation of the first arm segment 201 relative to the third arm segment 203 is called as a fifth axis and an axis of rotation of the second arm segment 202 relative to the fourth arm segment 204 is called as a sixth axis, then any two of the first axis, the second axis, the third axis, the fourth axis, the fifth axis and the sixth axis are parallel to each other, and all six axes extend in the second horizontal direction. In this way, as the top frame 104 ascends and descends relative to the base 108, the support arm assembly 105 is unfolded or folded accordingly. In FIG. 4, the second horizontal direction is the front-back direction.

Two ends of the supporter 106 are connected with the base 108 and the top frame 104 respectively. In FIG. 4, a bottom end of the supporter 106 is connected with the base 108, and a top end of the supporter 106 is connected with the top frame 104. The supporter 106 can fix the top frame 104 relative to the base 108, thus keeping a distance of the desk board assembly 101 relative to the base 108 in a vertical direction. Moreover, the telescopic supporter 106 (that is, a distance between the top end and the bottom end of the supporter 106 is capable of being changed) is capable of adjusting the distance of the desk board assembly 101 relative to the base 108 in the vertical direction, that is, a height of the desk board assembly 101. In this embodiment, the supporter 106 is a gas spring 206, which includes a cylinder 208 and a piston rod 207, and the piston rod 207 is slidably connected with the cylinder 208. A bottom end of the cylinder 208 is connected with the base 108. The piston rod 207 protrudes upward from a top end of the cylinder 208, and a top end of the piston rod 207 is connected with the top frame 104. The supporter 106 may also be an air cylinder or an oil cylinder, which also includes a cylinder 208 and a piston rod 207. In addition, the supporter 106 may be an electrically driven telescopic rod, an electric linear actuator, a linear motor, a screw module or any other component driven by electricity. Alternatively, the supporter 106 may also be provided as a telescopic rod assembly that can extend and retract and has no power source.

The support arm assembly 105 is configured as a rhombic linkage mechanism, such that one of diagonal lines of the support arm assembly 105 is perpendicular to the vertical direction, and the other one of the diagonal lines may be a symmetry axis 209 in FIG. 5. In this way, as the top frame 104 ascends and descends relative to the base 108, the support arm assembly 105 is unfolded or folded accordingly. The support arm assembly 105 guides the lifting (i.e., a height adjustment) of the desk board assembly 101 to enable the desk board assembly 101 to lift smoothly. The gas spring supports the desk board assembly 101, and drives the desk board assembly 101 to ascend and descend. The height of the desk board assembly 101 mainly depends on a telescopic length of the supporter 106.

In order to conveniently explain the beneficial effects of the height-adjustable desk 100 of the present disclosure, the height-adjustable desk 100 in the related art is introduced by taking FIG. 1 as an example. FIG. 1 shows a height-adjustable desk 100 in the related art. The height-adjustable desk 100 includes a desk board 102, a base 108 and a support arm assembly 105. The support arm assembly 105 includes a first support arm 401 and a second support arm 402 which are crossed and rotatably connected with each other. The desk board 102 has a first chute 403, in which a top end of the second support arm 402 is arranged. With the ascent and descent of the desk board 102, the top end of the second support arm 402 slides left and right along the first chute 403. The base 108 has a second chute 404, in which a bottom end of the first support arm 401 is arranged. With the ascent and descent of the desk board 102, the bottom end of the first support arm 401 slides left and right along the second chute 404. A top end of the first support arm 401 is rotatably connected with the desk board 102, and a bottom end of the second support arm 402 is rotatably connected with the base 108. When the desk board 102 is in a higher position (as shown in FIG. 1), the top end of the second support arm 402 is located at a left end of the first chute 403, and the bottom end of the first support arm 401 is located at a left end of the second chute 404. At this time, support points provided by the first support arm 401 and the second support arm 402 are located at a left half of the height-adjustable desk 100, and a right half of the height-adjustable desk 100 is in a suspended state. In this state, if a heavy object is placed on the right half of the desk board 102, the height-adjustable desk 100 is easy to fall down. In order to avoid this situation, it is necessary to limit a height of the desk board of the X-shaped height-adjustable desk 100 in the related art, which cannot meet use requirements of people of different heights for this type of height-adjustable desk.

As shown in FIG. 4, the support arm assembly of the height-adjustable desk of the present disclosure does not adopt the X-shaped frame in the related art, and the support arm assembly of the present disclosure adopts the rhombic frame to connect the desk board assembly 101 and the base 108 with the two ends of the supporter respectively. No matter how the height of the desk board assembly changes, a distance between a support point of the support arm assembly to the desk board assembly and the support point of the supporter to the desk board assembly, and a distance between a support point of the support arm assembly to the base and the support point of supporter to the base remain unchanged all the time. Therefore, both the support arm assembly and the supporter can effectively and stably support the desk board assembly, thus ensuring the stability of the height-adjustable desk. Compared with the X-shaped frame in the related art, especially when the desk board is in a higher position, the support of the height-adjustable desk of the present disclosure is more stable, and the stability of the height-adjustable desk of the present disclosure is better. Moreover, the height-adjustable desk 100 of the present disclosure provides two sets of support systems between the desk board assembly 101 and the base 108, where one set of the support systems is the support arm assembly 105 and another set of the support systems is the supporter 106. Since the top end of the supporter 106 is connected with the desk board assembly 101 and the bottom end of the supporter 106 is connected with the base 108, the number of support points of the desk board assembly 101 and the base 108 is larger, and the height-adjustable desk 100 of the present disclosure has high bearing capacity and stability.

The gas spring 206 has a locked state and an unlocked state. When the gas spring 206 is in the locked state, the gas spring 206 can fix the top frame 104 relative to the base 108. When the gas spring 206 is in the unlocked state, the gas spring 206 can drive the top frame 104 to ascend and descend relative to the base 108. In this way, the gas spring 206 is capable of driving the top frame 104 to ascend, so that a user does not need to spend much effort to adjust a position of the desk board 102, and the use of the height-adjustable desk 100 is more labor-saving and convenient.

The locked state and unlocked state are described below. Take the gas spring 206 as an example. When the gas spring 206 is in the unlocked state, the piston rod 207 can slide relative to the cylinder 208 under the action of the internal gas pressure of the gas spring 206. If a load on the desk board 102 is small, a length of a part of the piston rod 207 protruding out of the cylinder 208 may increase, and a height of the top frame 104 increases with an extension of the piston rod 207. When the gas spring 206 is in the locked state, the piston rod 207 is fixed relative to the cylinder 208, and at this time, the gas spring 206 can stably support the top frame 104. The height-adjustable desk 100 further includes a control handle 109 and a connecting rope (the connecting rope is not shown in the accompanying drawings). As shown in FIG. 2, the control handle 109 is rotatably connected to a bottom of the desk board 102, and the control handle 109 is connected to the gas spring 206 through the connecting rope. A user can pull the control handle 109 to switch the gas spring 206 to the unlocked state. When the user releases the control handle 109, the gas spring 206 returns to the locked state.

The internal structure and working principle of the gas spring 206 belong to the well-known technology in the field and will not be described in detail here. It should be noted that if it is necessary to lower the top frame 104, the user can switch the gas spring 206 to the unlocked state, and then exert great pressure on the desk board 102 by hand (or put some heavy articles on the desk board 102), so that the desk board 102 is pressed down, and the length of the part of the piston rod 207 protruding out of the cylinder 208 tapers off with the lowering of the desk board 102.

In the embodiment shown in FIG. 5, the bottom end of the cylinder 208 is connected with the base 108, and the top end of the piston rod 207 is connected with the top frame 104. In the second embodiment, as shown in FIG. 6, the gas spring 206 may also be arranged in a such way that the top end of the cylinder 208 is connected with the top frame 104, the piston rod 207 extends downward from the bottom end of the cylinder 208, and the bottom end of the piston rod 207 is connected with the base 108. In the embodiment shown in FIG. 6, the supporter 106 can also support the top frame 104 and drive the top frame 104 to ascend.

A relative position of the cylinder 208 and the piston rod 207 may be determined according to a position of the control handle 109. In a case that the control handle 109 is arranged on a bottom surface of the desk board 102, the piston rod 207 is arranged on the top and the cylinder 208 is arranged on the bottom to beneficially shorten a length of the connecting rope, as shown in an arrangement of the gas spring 206 of FIG. 5. In a case that the piston rod 207 is arranged on the bottom and the cylinder 208 is arranged on the top to beneficially shorten a length of the connecting rope, the gas spring 206 may be arrange as shown in FIG. 6.

It should be noted that in other embodiments, the control handle 109 may be installed at other position of the height-adjustable desk 100. For example, the control handle 109 may be installed on the top frame 104 or the base 108. For another example, as shown in FIG. 2, the desk board assembly 101 further includes a keyboard holder 103 for containing a keyboard. The keyboard holder 103 is connected with the desk board 102, located below the desk board 102, and at least a part of the keyboard holder 103 is located in front of the desk board 102, so as to reduce an obstruction of the desk board 102 to the user when using the keyboard. In a case that the height-adjustable desk 100 includes the keyboard holder 103, the control handle 109 may also be installed at a bottom of the keyboard holder 103.

The arrangement of the supporter 106 is further described below.

Referring to FIGS. 5 and 6, in some embodiments, the supporter 106 is inclined relative to the vertical direction. Accordingly, the top end of the supporter 106 is capable of rotating relative to the top frame 104, and the bottom end of the supporter 106 is capable of rotating relative to the base 108. With the folding of the support arm assembly 105, the supporter 106 is capable of rotating relative to the base 108 and the top frame 104, so that the height-adjustable desk 100 can be switched to the folded state as shown in FIG. 3. Since the supporter 106 is inclined relative to the vertical direction, the supporter 106 has a small height to beneficially reduce the height and volume of the height-adjustable desk 100 in the folded state. In FIG. 5, the top and bottom ends of the supporter 106 are arranged at intervals along the first horizontal direction (i.e., the left-right direction). In order to tilt the supporter 106, in other embodiments, the top and bottom ends of the supporter 106 may be arranged at intervals along other horizontal directions.

In addition, in other embodiments, the supporter 106 may also be vertically arranged. A component of force exerted on the top frame 104 by the vertically arranged supporter 106 in the vertical direction is relatively large to beneficially increase a speed of the top frame 104 when the top frame 104 is driven by the supporter 106 to ascend.

Referring to FIG. 5, the rhombic support arm assembly 105 is symmetrical. The symmetry axis 209 is a straight line extending in the vertical direction. The first arm segment 201 and the second arm segment 202 are symmetrically arranged based on the symmetry axis 209, and the third arm segment 203 and the fourth arm segment 204 are also symmetrically arranged based on the symmetry axis 209. The symmetry axis 209 corresponds to one of the diagonal lines of the rhombic support arm assembly 105. The top frame 104 may be symmetrically arranged based on the symmetry axis 209, and the base 108 may also be symmetrically arranged based on the symmetry axis 209. In a case that the supporter 106 is inclined relative to the vertical direction, in the first horizontal direction, the top end of the supporter 106 and the bottom end of the supporter 106 may be respectively arranged at different sides of the symmetry axis 209. For example, as shown in FIG. 5, the first horizontal direction corresponds to the left-right direction, the top end of the supporter 106 is on a right side of the symmetry axis 209, and the bottom end of the supporter 106 is on a left side of the symmetry axis 209. The arrangement that the top and bottom ends of the supporter 106 are located at different sides of the symmetry axis 209 is beneficial to increase a distance between a connection point of the supporter 106 with the base 108 and a connection point of the supporter 106 with the top frame 104, so that the height-adjustable desk 100 is not easy to shake left and right, and it is not easy to fall left or right.

As shown in FIG. 5, the top frame 104 includes a first end 501, which is a right end of the top frame 104, and the top end of the supporter 106 is located between the first end 501 and the symmetry axis 209. The base 108 includes a second end 502, which is a left end of the base 108. The second end 502 and the first end 501 are located on different sides of the symmetry axis 209, and the bottom end of the supporter 106 is located between the symmetry axis 209 and the second end 502. Positions of the top and bottom ends of the supporter 106 satisfy the following conditions: ⅓L₁≤L₂≤⅔L₁, ⅓L₃≤L₄≤⅔L₃. As shown in FIG. 5, a distance between the first end 501 and the symmetry axis 209 in the first horizontal direction is L₁, and a distance between the top end of the supporter 106 and the symmetry axis 209 in the first horizontal direction is L₂. A distance between the second end 502 and the symmetry axis 209 in the first horizontal direction is L₃, and a distance between the bottom end of the supporter 106 and the symmetry axis 209 in the first horizontal direction is L₄.

In the first horizontal direction, the greater the distance between the top end of the supporter 106 and the bottom end of the supporter 106, the higher the stability of the height-adjustable desk 100. In the first horizontal direction, the smaller the distance between the top end of the supporter 106 and the bottom end of the supporter 106, the greater the component of the force exerted by the supporter 106 on the top frame 104 in the vertical direction, and the faster the desk board assembly 101 ascends. The relationship among L₁, L₂, L₃, and L₄ is conducive to keeping the distance between the top end of the supporter 106 and the bottom end of the supporter 106 within a suitable range, so that the height-adjustable desk 100 has higher stability (i.e., the height-adjustable desk 100 is not easy to fall to the left or right) and the desk board assembly 101 has a faster ascent speed.

In order to further increase the number of support points of the top frame 104 and the base 108, a plurality of supporters 106 may be provided. As shown in FIG. 4, two supporters 106 are arranged. In other embodiments, the number of supporters 106 may be greater than two.

As shown in FIG. 4, in a case that a plurality of supporters 106 are provided, the supporters 106 may be arranged at intervals along the second horizontal direction. As shown in FIG. 4, since the top and bottom ends of the supporters 106 are arranged at intervals along the first horizontal direction, a single supporter 106 can make the top frame 104 have better stability in the first horizontal direction (i.e., the left-right direction). On this basis, a plurality of supporters 106 may be arranged along the second horizontal direction in order to improve the stability of the top frame 104 in the second horizontal direction (i.e., the front-back direction), thereby improving the overall stability of the desk board assembly 101.

As shown in FIG. 4, in an embodiment, the two supporters 106 are parallel to each other. In this arrangement, since directions of the force applied to the top frame 104 by the two supporters 106 are the same, the two supporters 106 provide relatively stable supporting to the top frame 104. In other embodiments, the number of the supporters 106 may be greater than two, as long as any two supporters 106 are parallel to each other. If a connecting line between the top end of the supporter 106 and the bottom end of the supporter 106 is called a central axis of the supporter 106, then the two supporters 106 parallel to each other means that the central axis of one supporter 106 is parallel to the central axis of another supporter 106.

It should be noted that in the embodiment shown in FIG. 4, the height-adjustable desk 100 can remain stable regardless of whether an article is placed in a left half or a right half of the desk board assembly 101, as the gas spring 206 has a locked state. For example, when an article is placed on the left half of the desk board assembly 101, the top end of the piston rod 207 of the gas spring 206 is subjected to a downward pressure, and the piston rod 207 will not slide downward due to this downward pressure when the gas spring 206 is in the locked state, so that the whole height-adjustable desk 100 is still in a stable state. When an article is placed on the right half of the desk board assembly 101, the top end of the piston rod 207 of the gas spring 206 is subjected to an upward pulling force, and the piston rod 207 will not slide upward due to this upward pulling force when the gas spring 206 is in the locked state, so that the whole height-adjustable desk 100 is still in a stable state.

In the case that the plurality of supporters 106 are provided, the supporters 106 may be arranged in other ways. For example, any two adjacent supporters 106 are arranged in a crossed way. For example, as shown in FIG. 6, in another embodiment, as viewed in the second horizontal direction, the two adjacent supporters 106 are inclined relative to the vertical direction, and the two adjacent supporters 106 are symmetrically arranged based on the symmetry axis 209. The second horizontal direction may correspond to a direction perpendicular to the paper sheet in FIG. 6.

The structure of the support arm assembly 105 is further described below.

As shown in FIG. 7, the first arm segment 201 has a first groove 301. In some embodiments, the first groove 301 may be configured to accommodate other arm segments in the support arm assembly 105 (to be illustrated below). Moreover, due to the first groove 301, a weight of the first arm segment 201 is small, and an overall weight of the height-adjustable desk 100 is also small. The first groove 301 extends along a length direction of the first arm segment 201, and an opening of the first groove 301 faces the fourth arm segment 204. A cross section of the first arm segment 201 is U-shaped. Therefore, the first arm segment 201 has good strength as well as a light weight.

Similarly, as shown in FIG. 7, the third arm segment 203 has a third groove 303 configured to accommodate other arm segments in the support arm assembly 105. The third groove 303 extends along a length direction of the third arm segment 203, and an opening of the third groove 303 faces the second arm segment 202. A cross section of the third arm segment 203 is U-shaped, and the third arm segment 203 has good strength as well as a light weight.

Similarly, as shown in FIG. 8, the second arm segment 202 has a second groove 302 configured to accommodate other arm segments in the support arm assembly 105. The second groove 302 extends along a length direction of the second arm segment 202, and an opening of the second groove 302 faces the third arm segment 203. A cross section of the second arm segment 202 is U-shaped, and the second arm segment 202 has good strength as well as a light weight.

Similarly, as shown in FIG. 8, the fourth arm segment 204 has a fourth groove 304 configured to accommodate other arm segments in the support arm assembly 105. The fourth groove 304 extends along the length direction of the fourth arm segment 204, and the opening of the fourth groove 304 faces the first arm segment 201. The cross section of the fourth arm segment 204 is U-shaped, and the fourth arm segment 204 has good strength under the condition of light weight.

It should be noted that in the embodiments shown in FIGS. 7 and 8, the first arm segment 201, the second arm segment 202, the third arm segment 203 and the fourth arm segment 204 all have corresponding grooves. However, in other embodiments, in order to reduce the weight of the height-adjustable desk 100, at least one of the first arm segment 201, the second arm segment 202, the third arm segment 203 and the fourth arm segment 204 has a corresponding groove.

Referring to FIGS. 7 and 8, in an embodiment, the first arm segment 201 has the first groove 301 and the second arm segment 202 has the second groove 302. A width of the first groove 301 is greater than that of the third arm segment 203, and a width of the second groove 302 is greater than that of the fourth arm segment 204. When the height-adjustable desk 100 is in a folded state (the folded state is shown in FIG. 3), at least a part of the third arm segment 203 is accommodated in the first groove 301, and at least a part of the fourth arm segment 204 is accommodated in the second groove 302. This arrangement can improve the layout compactness among the parts of the height-adjustable desk 100 in the folded state, thereby reducing the volume of the height-adjustable desk 100 in the folded state and facilitating the storage and transportation of the height-adjustable desk 100.

It should be noted that in order to reduce the volume of the height-adjustable desk 100 in the folded state, the support arm assembly 105 may be arranged in other different ways.

For example, the third arm segment 203 has the third groove 303, and the fourth arm segment 204 has the fourth groove 304. The width of the third groove 303 is greater than that of the first arm segment 201, and the width of the fourth groove 304 is greater than that of the first arm segment 201. When the height-adjustable desk 100 is in a folded state, at least a part of the first arm segment 201 is accommodated in the third groove 303, and at least a part of the second arm segment 202 is accommodated in the fourth groove 304.

For another example, the first arm segment 201 has the first groove 301, and the fourth arm segment 204 has the fourth groove 304. The width of the first groove 301 is greater than that of the third arm segment 203, and the width of the fourth groove 304 is greater than that of the second arm segment 202. When the height-adjustable desk 100 is in a folded state, at least a part of the third arm segment 203 is accommodated in the first groove 301, and at least a part of the second arm segment 202 is accommodated in the fourth groove 304.

For another example, the second arm segment 202 has the second groove 302, and the third arm segment 203 has the third groove 303. The width of the second groove 302 is greater than that of the fourth arm segment 204, and the width of the third groove 303 is greater than that of the first arm segment 201. When the height-adjustable desk 100 is in a folded state, at least a part of the fourth arm segment 204 is accommodated in the second groove 302, and at least a part of the first arm segment 201 is accommodated in the third groove 303.

In an embodiment, referring to FIGS. 11 and 14, the first arm segment 201 and the second arm segment 202 are on a first vertical plane, and the third arm segment 203 and the fourth arm segment 204 are on a second vertical plane. The first vertical plane and the second vertical plane are parallel (not coincident) with each other. In this way, when the support arm assembly 105 in the folded state is viewed from the first horizontal direction, at least some areas of the first arm segment 201 and the third arm segment 203, the second arm segment 202 and the fourth arm segment 204 are overlapped. This arrangement can also improve the layout compactness among the parts of the height-adjustable desk 100 in the folded state, thereby reducing the overall volume and occupied space of the height-adjustable desk 100 in the folded state and facilitating the storage and transportation of the height-adjustable desk 100.

Referring to FIG. 4, in an embodiment, a plurality of support arm assemblies 105 are arranged at intervals along the second horizontal direction. Increasing the number of support arm assemblies 105 is beneficial to increase the support points of the top frame 104 and the base 108, thus further improving the stability of the height-adjustable desk 100. In FIG. 4, there are two support arm assemblies 105. In other embodiments, there may be more support arm assemblies 105. Referring to FIG. 4, a supporter 106 is disposed in a gap formed by two adjacent support arm assemblies 105. This arrangement is beneficial to improve the layout compactness among the parts of the height-adjustable desk 100, thereby reducing the space occupied by the height-adjustable desk 100.

Referring to FIG. 4, in an embodiment, the height-adjustable desk 100 includes at least one connecting bar 107, and both ends of the at least one connecting bar 107 (both ends in the second horizontal direction) are fixedly connected with two adjacent support arm assemblies 105, respectively. Since the two adjacent support arm assemblies 105 are connected through the connecting bar 107, a risk that one support arm assembly 105 moves relative to another support arm assembly 105 is reduced, and the two support arm assemblies 105 provide high support stability for the desk board assembly 101.

As shown in FIG. 4, four connecting bars 107 may be arranged, namely, a first connecting bar 205, a second connecting bar 210, a third connecting bar 211 and a fourth connecting bar 212. Two ends of the first connecting bar 205 are fixedly connected with two adjacent first arm segments 201. Two ends of the second connecting bar 210 are fixedly connected with two adjacent second arm segments 202. Two ends of the third connecting bar 211 are fixedly connected with two adjacent third arm segments 203, and two ends of the fourth connecting bar 212 are fixedly connected with two adjacent fourth arm segments 204.

In this arrangement, two first arm segments 201 belonging to different support arm assemblies 105 can move synchronously. Two second arm segments 202 belonging to different support arm assemblies 105 can move synchronously. Two third arm segments 203 belonging to different support arm assemblies 105 can move synchronously, and two fourth arm segments 204 belonging to different support arm assemblies 105 can move synchronously. Therefore, states of two adjacent support arm assemblies 105 can be changed synchronously, which is beneficial to improve the stability of the ascent and descent process of the desk board assembly 101 and the stability of the supporting of the support arm assemblies 105 on the desk board assembly 101.

It should be noted that the height-adjustable desk 100 does not necessarily to have the four connecting bars 107. The height-adjustable desk 100 may have at least one of the first connecting bar 205, the second connecting bar 210, the third connecting bar 211 and the fourth connecting bar 212. In other words, in order to enable two adjacent support arm assemblies 105 to move synchronously, at least one group of two first arm segments 201, two second arm segments 202, two third arm segments 203 and two fourth arm segments 204 of two adjacent support arm assemblies 105 may be connected with one connecting bar 107. When the number of connecting bars 107 is two, one group of the two first arm segments 201 and the two second arm segments 202 may be connected with one connecting bar 107, and one group of the two third arm segments 203 and the two fourth arm segments 204 may be connected with another connecting bar 107.

The structure of the support arm assembly 105 is further described below.

Referring to FIGS. 11 and 12, according to the height-adjustable desk of the third embodiment of the present disclosure, the height-adjustable desk 100 further includes at least two groups of auxiliary link assemblies 601. Each of the auxiliary link assemblies 601 includes a slide rail 602 fixedly connecting with the desk board assembly 101 or the base 108; and a link rod 604 rotatably connecting with the support arm assembly 105 at one end of the link rod 604, and slidably connecting with the slide rail 602 through a pulley 603 at another end of the link rod 604. When the supporter 106 extends and retracts, the pulley 603 is capable of sliding in the slide rail 602, so that the each of the auxiliary link assemblies 601 can additionally support the desk board 102 and the base 108 during the extension and retraction of the supporter 106, reduce the swinging and shaking of the desk board 102 and the base 108 in the horizontal directions.

In an embodiment, at least two groups of auxiliary link assemblies 601 may be arranged between the support arm assembly 105 and the desk board assembly 101. A slide rail 602 is fixedly connected with the desk board assembly 101. A link rod 604 of one group of the auxiliary link assemblies 601 rotatably connects with a middle or upper part of the third arm segment 203 at one end of the link rod 604, and slidably connects with the slide rail 602 through a pulley 60 at another end of the link rod 604, so that when the link rod 604 rotates relative to the third arm segment 203, the pulley 603 slides accordingly in the slide rail 602. Meanwhile, a link rod 604 of another group of auxiliary link assemblies 601 is rotatably connects with a middle or upper part of the fourth arm segment 204 at one end of the link rod 604, and slidably connects with the slide rail 602 through a pulley 603 at another end of the link rod 604, so that when the link rod 604 rotates relative to the fourth arm segment 204, the pulley 603 accordingly slides in the slide rail 602. The two groups of auxiliary link assemblies 601 are symmetrically arranged based on the symmetry axis 209.

In an embodiment, at least two groups of auxiliary link assemblies 601 may also be arranged between the support arm assembly 105 and the base 108. A slide rail 602 is fixedly connected with the base 108. A link rod 604 of one group of the auxiliary link assemblies 601 is rotatably connects with a middle or upper part of the first arm segment 201 at one end of the link rod 604, and slidably connects with the slide rail 602 through a pulley 60 at another end of the link rod 604, so that when the link rod 604 rotates relative to the first arm segment 201, the pulley 603 slides accordingly in the slide rail 602. Meanwhile, a link rod 604 of another group of auxiliary link assemblies 601 is rotatably connects with a middle or upper part of the second arm segment 202 at one end of the link rod 604, and slidably connects with the slide rail 602 through a pulley 603 at another end of the link rod 604, so that when the link rod 604 rotates relative to the second arm segment 202, the pulley 603 correspondingly slides in the slide rail 602. The two groups of auxiliary link assemblies 601 are symmetrically arranged based on the symmetry axis 209.

In practical application, two, three or four groups of auxiliary link assemblies 601 may be arranged between the support arm assembly 105 and the desk board assembly 101. Meanwhile, two, three or four groups of auxiliary link assemblies 601 may also be arranged between the support arm assembly 105 and the base 108. In this way, the auxiliary link assemblies 601 can additionally support the desk board 102 and the base 108 during the extension and retraction of the supporter 106, reduce the swinging and shaking of the desk board 102 and the base 108 in the horizontal directions.

Referring to FIG. 13, the support arm assembly 105 further includes a gear seat. The gear seat includes a bottom gear seat 701A and a top gear seat 701B. The bottom gear seat 701A is arranged at a joint of the first arm segment 201 and the second arm segment 202, and the bottom end of the first arm segment 201 and the bottom end of the second arm segment 202 are both rotatably connected with the base 108 through the bottom gear seat 701A. The bottom end of first arm segment 201 and the bottom end of the second arm segment 202 are respectively provided with a first limit post 703A and a second limit post 703B. The bottom gear seat 701A is provided with a first arc chute 702A and a second arc chute 702B for respectively accommodating the first limit post 703A and the second limit post 703B to slide, and the first arc chute 702A and the second arc chute 702B are symmetrically arranged based on the symmetry axis 209. The top gear seat 701B is arranged at a joint of the third arm segment 203 and the fourth arm segment 204, and the top end of the third arm segment 203 and the top end of the fourth arm segment 204 are both rotatably connected with the desk board assembly 101 through the top gear seat 701B. The top end of third arm segment 203 and the top end of the fourth arm segment 204 are respectively provided with a third limit post 703C and a fourth limit post 703D. The top gear seat is provided with a third arc chute 702C and a fourth arc chute 702D for respectively accommodating the third limit post 703C and the fourth limit post 703D to slide, and the third arc chute 702C and the fourth arc chute 702D are symmetrically arranged based on the symmetry axis 209. When the supporter 106 extends and retracts, the first limit post 703A, the second limit post 703B, the third limit post 703C and the fourth limit post 703D slide in the first arc chute 703A and the second arc chute 703B in the bottom gear seat 701A, and the third arc chute 703C and the fourth arc chute 703D in the top gear seat 701B, respectively, and the arc chutes limit the limit posts. Therefore, when the supporter 106 extends and retracts, a lateral movement of the rhombic support arm assembly 105 composed of the first arm segment 201, the second arm segment 202, the third arm segment 203 and the fourth arm segment 204 is further restrained to reduce the swinging and shaking of the height-adjustable desk.

Referring to FIG. 14, the supporter 106 may be installed in a variety of ways. Under a case that one end of the supporter 106 is connected with the base 108, another end of the supporter 106 may be connected with the connecting bar 107 rather than the desk board assembly 101, so that the supporter 106 can extend and retract to adjust a distance between the connecting bar 107 and the base 108 in the vertical direction. The supporter 106 is also configured to support the desk board assembly 101 to maintain a distance between the connecting bar 107 and the base 108 in the vertical direction.

For example, in an embodiment of the supporter 106, the supporter 106 is rotatably connects with the base 108 at one end of the supporter 106, and rotatably connects with the third connecting bar 211 at another end of the supporter 106, and the supporter 106 is inclined relative to the vertical direction. Alternatively, the supporter 106 rotatably connects with the base 108 at one end of the supporter 106, and rotatably connects with the fourth connecting bar 212 at another end of the supporter 106, and the supporter 106 is inclined relative to the vertical direction.

For example, in another embodiment of the supporter 106, the supporter 106 rotatably connects with the desk board assembly 101 at one end of the supporter 106, and rotatably connects with the first connecting bar 205 at another end of the supporter 106, and the supporter 106 is inclined relative to the vertical direction. Alternatively, the supporter 106 rotatably connects with the desk board assembly 101 at one end of the supporter 106, and rotatably connects with the second connecting bar 210 at another end of the supporter 106, and the supporter 106 is inclined relative to the vertical direction.

In the description of the present disclosure, the description with reference to the terms “an embodiment”, “some embodiments”, “schematic embodiments”, “examples”, “specific examples” or “some examples” means that the specific features, structures, materials or characteristics described in combination with this embodiment or example are included in at least one embodiment or example of the present disclosure. In this description, schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A height-adjustable desk, comprising:

a base;

a desk board assembly above the base;

a support arm assembly, which is a rhombic linkage mechanism, wherein, the support arm assembly comprises a first arm segment, a second arm segment, a third arm segment and a fourth arm segment, both a bottom end of the first arm segment and a bottom end of the second arm segment rotatably connect with the base, both a top end of the third arm segment and a top end of the fourth arm segment rotatably connect with the desk board assembly, a top end of the first arm segment rotatably connects with a bottom end of the third arm segment, a top end of the second arm segment rotatably connects with a bottom end of the fourth arm segment, the bottom end of the first arm segment and the bottom end of the second arm segment connect in an engaging transmission manner, and the top end of the third arm segment and the top end of the fourth arm segment connect in an engaging transmission manner; and

at least one supporter, connecting with the base at one end of the at least one supporter, and connecting with the desk board assembly at another end of the at least one supporter, wherein, the at least one supporter is capable of extending and retracting to adjust a distance between the desk board assembly and the base in a vertical direction, and configured to support the desk board assembly to maintain the distance between the desk board assembly and the base in the vertical direction.

2. The height-adjustable desk of claim 1, wherein the at least one supporter inclines relative to the vertical direction, a top end of the at least one supporter rotatably connects with the desk board assembly, and a bottom end of the at least one supporter rotatably connects with the base.

3. The height-adjustable desk of claim 2, wherein the support arm assembly further comprises at least one of:

a bottom gear seat at a joint of the first arm segment and the second arm segment, so that both the bottom end of the first arm segment and the bottom end of the second arm segment rotatably connect with the base through the bottom gear seat, wherein the bottom end of the first arm segment and the bottom end of the second arm segment are respectively provided with a first limit post and a second limit post, and the bottom gear seat is provided with a first arc chute and a second arc chute for accommodating the first limit post and the second limit post to slide respectively; or

a top gear seat at a joint of the third arm segment and the fourth arm segment, so that both the top end of the third arm segment and the top end of the fourth arm segment rotatably connect with the desk board assembly through the top gear seat, wherein the top end of the third arm segment and the top end of the fourth arm segment are respectively provided with a third limit post and a fourth limit post, and the top gear seat is provided with a third arc chute and a fourth arc chute for accommodating the third limit post and the fourth limit post to slide respectively.

4. The height-adjustable desk of claim 3, wherein the first arm segment and the second arm segment are arranged along a first horizontal direction, the third arm segment and the fourth arm segment are arranged along the first horizontal direction, the first arm segment and the second arm segment are symmetrically arranged based on a symmetry axis extending in the vertical direction, and the third arm segment and the fourth arm segment are symmetrically arranged based on the symmetry axis; and

wherein in the first horizontal direction, the top end of the at least one supporter and the bottom end of the at least one supporter are respectively located at different sides of the symmetry axis.

5. The height-adjustable desk of claim 4, wherein the desk board assembly comprises a top frame and a desk board, both the third arm segment and the fourth arm segment rotatably connect with the top frame, the desk board fixedly connects with a top of the top frame, the top frame comprises a first end, the top end of the at least one supporter locates between the first end and the symmetry axis in the first horizontal direction, a distance between the first end and the symmetry axis in the first horizontal direction is L1, and a distance between the top end of the at least one supporter and the symmetry axis in the first horizontal direction is L2, wherein ⅓L1≤L2≤⅔L1; and

wherein, the base comprises a second end, the second end and the first end respectively locate at different sides of the symmetry axis in the first horizontal direction, the bottom end of the at least one supporter locate between the second end and the symmetry axis, a distance between the second end and the symmetry axis in the first horizontal direction is L3, and a distance between the bottom end of the at least one supporter and the symmetry axis in the first horizontal direction is L4, wherein ⅓L3≤L4≤⅔L3.

6. The height-adjustable desk of claim 5, wherein the first arm segment and the second arm segment are arranged along the first horizontal direction, and a second horizontal direction is perpendicular to the first horizontal direction; and

wherein the top end of the at least one supporter rotatably connects with the desk board assembly, the bottom end of the at least one supporter rotatably connects with the base, the top end and the bottom end of the at least one supporter are arranged at intervals along the first horizontal direction, and a plurality of supporters are arranged at intervals along the second horizontal direction.

7. The height-adjustable desk of claim 6, wherein any two supporters are parallel to each other, alternately, any two adjacent supporters are arranged in a crossed way.

8. The height-adjustable desk of claim 1, wherein at least one of the first arm segment is provided with a first groove, the second arm segment is provided with a second groove, the third arm segment is provided with a third groove, or the fourth arm segment is provided with a fourth groove.

9. The height-adjustable desk of claim 1, wherein the first arm segment and the second arm segment are arranged along a first horizontal direction, and a second horizontal direction is perpendicular to the first horizontal direction; and

wherein a plurality of support arm assemblies are arranged at intervals along the second horizontal direction.

10. The height-adjustable desk of claim 9, wherein the height-adjustable desk further comprises at least one connecting bar, and at least one group of two first arm segments, two second arm segments, two third arm segments and two fourth arm segments of two adjacent support arm assemblies connects with the at least one connecting bar.

11. The height-adjustable desk of claim 1, wherein the at least one supporter is an electrically driven telescopic rod or a mechanically driven telescopic rod.

12. The height-adjustable desk of claim 1, wherein the height-adjustable desk further comprises at least two groups of auxiliary link assemblies, and each of the auxiliary link assemblies comprises:

a slide rail fixedly connecting with the desk board assembly or the base; and

a link rod rotatably connecting with the support arm assembly at one end of the link rod, and slidably connecting with the slide rail through a pulley at another end of the link rod.

13. A height-adjustable desk, comprising:

a base;

a desk board assembly above the base;

two support arm assemblies arranged between the desk board assembly and the base in parallel, wherein, each of the two support arm assemblies is a rhombic linkage mechanism and comprises a first arm segment, a second arm segment, a third arm segment and a fourth arm segment, both a bottom end of the first arm segment and a bottom end of the second arm segment rotatably connect with the base, both a top end of the third arm segment and a top end of the fourth arm segment rotatably connect with the desk board assembly, a top end of the first arm segment rotatably connects with a bottom end of the third arm segment, a top end of the second arm segment rotatably connects with a bottom end of the fourth arm segment, the bottom end of the first arm segment and the bottom end of the second arm segment connect in an engaging transmission manner, and the top end of the third arm segment and the top end of the fourth arm segment connect in an engaging transmission manner;

a connecting bar, wherein at least one group of two first arm segments, two second arm segments, two third arm segments and two fourth arm segments of two adjacent support arm assemblies connects with the connecting bar; and

at least one supporter, connecting with the base at one end of the at least one supporter, and connecting with the connecting bar at another end of the at least one supporter, the at least one supporter is capable of extending and retracting to adjust a distance between the connecting bar and the base in a vertical direction, and the at least one supporter is configured to support the desk board assembly to maintain the distance between the connecting bar and the base in the vertical direction.

14. The height-adjustable desk of claim 13, wherein the at least one supporter inclines relative to the vertical direction, a top end of the at least one supporter rotatably connects with the connecting bar, and a bottom end of the at least one supporter rotatably connects with the base.

15. The height-adjustable desk of claim 14, wherein the support arm assembly further comprises at least one of:

a bottom gear seat at a joint of the first arm segment and the second arm segment, so that both the bottom end of the first arm segment and the bottom end of the second arm segment rotatably connect with the base through the bottom gear seat, wherein the bottom end of the first arm segment and the bottom end of the second arm segment are respectively provided with a first limit post and a second limit post, and the bottom gear seat is provided with a first arc chute and a second arc chute for accommodating the first limit post and the second limit post to slide respectively; or

a top gear seat at a joint of the third arm segment and the fourth arm segment, so that both the top end of the third arm segment and the top end of the fourth arm segment rotatably connect with the desk board assembly through the top gear seat, wherein the top end of the third arm segment and the top end of the fourth arm segment are respectively provided with a third limit post and a fourth limit post, and the top gear seat is provided with a third arc chute and a fourth arc chute for accommodating the third limit post and the fourth limit post to slide respectively.

16. The height-adjustable desk of claim 15, wherein the first arm segment and the second arm segment are arranged along a first horizontal direction, and the third arm segment and the fourth arm segment are arranged along the first horizontal direction, the first arm segment and the second arm segment are symmetrically arranged based on a symmetry axis extending in the vertical direction, and the third arm segment and the fourth arm segment are symmetrically arranged based on the symmetry axis; and

wherein in the first horizontal direction, the top end of the at least one supporter and the bottom end of the at least one supporter respectively locates at different sides of the symmetry axis.

17. The height-adjustable desk of claim 16, the desk board assembly comprises a top frame and a desk board, both the third arm segment and the fourth arm segment rotatably connect with the top frame, the desk board fixedly connects with a top of the top frame, the top frame comprises a first end, the top end of the at least one supporter locates between the first end and the symmetry axis in the first horizontal direction, a distance between the first end and the symmetry axis in the first horizontal direction is L1, and a distance between the top end of the at least one supporter and the symmetry axis in the first horizontal direction is L2, wherein ⅓L1≤L2≤⅔L1; and

wherein, the base comprises a second end, the second end and the first end respectively locates at different sides of the symmetry axis in the first horizontal direction, the bottom end of the at least one supporter locates between the second end and the symmetry axis, a distance between the second end and the symmetry axis in the first horizontal direction is L3, and a distance between the bottom end of the at least one supporter and the symmetry axis in the first horizontal direction is L4, wherein ⅓L3≤L4≤⅔L3.

18. The height-adjustable desk of claim 17, wherein the first arm segment and the second arm segment are arranged along the first horizontal direction, and a second horizontal direction is perpendicular to the first horizontal direction; and

wherein the top end of the at least one supporter rotatably connects with the desk board assembly, the bottom end of the at least one supporter rotatably connects with the base, the top end and the bottom end of the at least one supporter are arranged at intervals along the first horizontal direction, a plurality of supporters are arranged at intervals along the second horizontal direction.

19. The height-adjustable desk of claim 13, wherein the at least one supporter is an electrically driven telescopic rod or a mechanically driven telescopic rod.

20. The height-adjustable desk of claim 13, wherein the height-adjustable desk further comprises at least two groups of auxiliary link assemblies, and each of the auxiliary link assemblies comprises:

a slide rail fixedly connecting with the desk board assembly or the base; and

a link rod rotatably connecting with the support arm assembly at one end of the link rod, and slidably connecting with the slide rail through a pulley at another end of the link rod.