EXTENDABLE SEAT FRAME AND FURNITURE THEREOF

Abstract

Provided are an extendable seat frame and a furniture thereof. The extendable seat frame includes: a fixed base; a seat frame main body, configured to move relatively above the fixed base; and an extension apparatus, configured to be rotatably connected to the fixed base and rotatably connected to the seat frame main body so as to enable the extendable seat frame to switch between a retracted state and an extended state. Further, the extension apparatus includes at least an extension part, one end of the extension part is rotatably connected to an end of the seat frame main body that is away from an extending direction, and the extension part is configured to drive the extension part to flip in response to the seat frame main body moving towards the extending direction.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation application of PCT application No. PCT/CN2023/075714 filed on Feb. 13, 2023 which is based upon and claims priority to Chinese Patent Application No. 202220411743.8 filed on Feb. 28, 2022, and is also based upon and claims priority to Chinese Patent Application No. 202322456851.4, filed on Sep. 11, 2023, the entire disclosures of which are incorporated herein by reference for all purposes.

FIELD

The present application generally relates to the field of smart home technology, and in particular but not limited to integrated extendable seat frames and seats.

BACKGROUND

As the demand for smart home solutions increases, existing furniture such as sofas and chairs often feature movable seat frames to meet the varying needs of different users. Functional seats can adjust their posture, thus presenting different structural states to meet consumers' needs in various postures. Common functional seats generally have a sitting posture and a lying posture (i.e., reclining posture), where the seat acts as a bed in the lying posture. In practice, to control the size of the seat, a leg extension structure is often used to lengthen the seat. When the seat is in the sitting posture, the leg extension structure retracts backward and downward under the seat frame. When the seat is in the lying posture, the leg extension structure extends forward and upward to the front of the seat frame. However, the leg extension structure has limited effectiveness in extendable the seat length. Additionally, storing a large leg extension structure is inconvenient, and its structural stability is poor in the extended state. As a result, functional seats using conventional leg extension structures are not able to provide a reclining-like experience in the reclining position, and thus need to be improved.

Additionally, the existing movable range of seat frames is limited. Some seats extend the length of the seat cushion by adding a footrest-like structure at the front of the seat frame, which does not meet the diverse needs of users for cushion length. Moreover, after the seat frame is extended, a significant gap appears between the back of the seat frame and the backrest frame, resulting in poor comfort and even potential safety hazards for users. Additionally, the adjustment of the seat frame position in existing technologies often relies on manual adjustment by users, which is time-consuming and inconvenient.

Therefore, there is a need for an extendable seat frame and seat that can significantly increase the extension distance of the seat frame main body and, at the same time, drive the flip of the extension part behind the seat frame main body as it extends, to compensate for the gap formed by the movement of the seat frame main body, ensuring smooth movement, comfort, and high safety.

BRIEF SUMMARY

The present disclosure provides examples of techniques relating to improving an extendable seat frame and a seat.

According to a first aspect of the present disclosure, an extendable seat frame is provided, which may include: a fixed base; a seat frame main body, configured to move relatively above the fixed base; and an extension apparatus, configured to be rotatably connected to the fixed base and rotatably connected to the seat frame main body so as to enable the extendable seat frame to switch between a retracted state and an extended state.

Furthermore, the extension apparatus includes at least an extension part, one end of the extension part is rotatably connected to an end of the seat frame main body that is away from an extending direction, and the extension part is configured to drive the extension part to flip in response to the seat frame main body moving towards the extending direction.

According to a second aspect of the present disclosure, a furniture is provided, which may include: a first cushion, a second cushion, and an extendable seat frame including: a fixed base; a seat frame main body, configured to move relatively above the fixed base; and an extension apparatus, configured to be rotatably connected to the fixed base and rotatably connected to the seat frame main body so as to enable the extendable seat frame to switch between a retracted state and an extended state.

Furthermore, the extension apparatus includes at least an extension part, one end of the extension part is rotatably connected to an end of the seat frame main body that is away from an extending direction, and the extension part is configured to drive the extension part to flip in response to the seat frame main body moving towards the extending direction.

Moreover, the first cushion is placed above the seat frame main body, the second cushion is placed above the extension part, an upper surface of the first cushion and an upper surface of the second cushion are on a same horizontal plane.

It is to be understood that both the foregoing general description and the following detailed description are examples only and are not restrictive of the present disclosure.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate examples consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

FIG. 1 illustrates a perspective view of the extendable seat frame in a retracted or a folded state according to one example of this present disclosure.

FIG. 2 illustrates a front view of the extendable seat frame in the retracted state or the folded state according to the example of this present disclosure.

FIG. 3 illustrates a perspective view of the extendable seat frame in an extended state according to the example of this present disclosure.

FIG. 4 illustrates a front view of the extendable seat frame in the extended state according to the example of this present disclosure.

FIG. 5 illustrates a structural schematic view of an adjustment frame and an extension apparatus in the retracted state or the folded state of the extendable seat frame according to the example of this present disclosure.

FIG. 6 illustrates a structural schematic view of the adjustment frame and the extension apparatus in the extended state of the extendable seat frame according to the example of this present disclosure.

FIG. 7 illustrates a structural schematic view of the seat in the retracted state or the folded state according to the example of this present disclosure.

FIG. 8 illustrates a structural schematic view of the seat in the extended state according to the example of this present disclosure.

FIG. 9 is a schematic structural view of an extendable seat frame in a retracted state or a folded state according to another example of the present disclosure.

FIG. 10 is a schematic structural view of the extendable seat frame in an extended state according to the example as shown in FIG. 9.

FIG. 11 is a schematic view of the connection relationship between a seat frame main body and a hidden extension apparatus in the retracted state or folded state as shown in FIG. 9.

FIG. 12 is a schematic view of the connection relationship between the seat frame main body and the hidden extension apparatus in the extended state as shown in FIG. 9.

FIG. 13 is a schematic structural view of a sliding apparatus in a retracted state or a folded state in another example of this present disclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to specific implementations, examples of which are illustrated in the accompanying drawings. In the following detailed description, numerous non-limiting specific details are set forth in order to assist in understanding the subject matter presented herein. But various alternatives may be used without departing from the scope of claims and the subject matter may be practiced without these specific details.

Reference throughout this specification to “one embodiment,” “an embodiment,” “an example,” “some embodiments,” “some examples,” or similar language means that a particular feature, structure, or characteristic described is included in at least one embodiment or example. Features, structures, elements, or characteristics described in connection with one or some embodiments are also applicable to other embodiments, unless expressly specified otherwise.

In the present disclosure, it should be understood that terms such as “up,” “down,” “left,” “right,” “top,” “bottom,” “front,” “rear,” etc., indicating directions or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. These terms are used for ease of description and simplification, and do not imply that the indicated devices or components must have specific orientations or be constructed and operated in specific orientations. Therefore, they should not be construed as limitations to the present disclosure.

It should be illustrated that the terms “first,” “second,” and the like used in the description, claims of the present disclosure, and the accompanying drawings are used to distinguish objects, and not used to describe any specific order or sequence.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of this present application is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure.

Referring to FIG. 1 to FIG. 8, an integrated extendable seat frame is applied to a seat. Specifically, the integrated extendable seat frame constitutes the main framework of the seat, and the posture adjustment of the integrated extendable seat frame corresponds to the posture adjustment of the seat. For convenience of description, the integrated extendable seat frame will be collectively referred to as the extendable seat frame in the following text.

The extendable seat frame may include a base 1, an adjustment frame 3, a driver 2, and an extension apparatus 4. The base 1 may include a front end and a rear end in the extendable direction of the extendable seat frame. The adjustment frame 3 is movably mounted on the base 1. The driver 2 drives the adjustment frame 3 to reciprocate between the front end and the rear end, so that the extendable seat frame can switch between an extended state and a retracted state (i.e., a folded state).

The extension apparatus 4 is adjustably configured between the base 1 and the adjustment frame 3. The extension apparatus 4 includes a limiting link 41, a backrest fixing rod 42, and an extension plate set 43 that are pivotally connected in sequence. The limiting link 41 is pivotally connected to the base 1, and the extension plate set 43 is pivotally connected to the adjustment frame 3.

When the extendable seat frame switches from the retracted state to the extended state, the adjustment frame 3 moves toward the front end, and the extension plate set 43 pulls the backrest fixing rod 42 and the limiting link 41 to flip toward the front end.

FIG. 7 and FIG. 8 are schematic diagrams of the structure of the extendable seat frame with cushions assembled. Specifically, the base 1 provides longitudinal support force for the extendable seat frame or the seat including the extendable seat frame. The adjustment frame 3 is fitted with a seat cushion I, and the backrest fixing rod 42 is fitted with an extension cushion II. When the seat, that is, the extendable seat frame, is in the retracted state, the backrest fixing rod 42, extension cushion II, and part of the seat cushion I are stored behind the backrest cushion III. When the seat, that is, the extendable seat frame, is in the extended state, the adjustment frame 3 drives the seat cushion I forward, and the backrest fixing rod 42 drives the extension cushion II to flip forward, thereby extendable the length of the seat.

It should be noted that the increased seat depth or length of the seat in the extended state, compared to the seat in the retracted state, is the sum of the length of the extension cushion II and the length of the part of the seat cushion I that is behind the backrest cushion III. This significantly increases the length of the seat, thereby enabling the seat to function as a bed in the extended state.

In another example, in order to improve structural stability, the adjustment frame 3 has a support rod 33. The support rod 33 extends in the front-rear direction, that is, in the extendable direction of the extendable seat frame. The front end of the support rod 33 is equipped with a roller 331 that is in rolling contact with the ground, and the seat cushion I is positioned on the support rod 33.

In another example, the extension plate set 43 includes at least one pulling extension plate 431, with one end of the pulling extension plate 431 pivotally connected to the backrest fixing rod 42 and the other end pivotally connected to the adjustment frame 3. The adjustment frame 3 is capable of more stably driving the backrest fixing rod 42 through the pulling extension plate 431, while also being able to reduce the height of the adjustment frame 3 through the pulling extension plate 431.

In another example, when the adjustment frame 3 is directly pivotally connected to the backrest fixing rod 42, the height of the adjustment frame 3 would need to be increased to achieve the same leverage effect provided by the pulling extension plate 431. However, increasing the height of the adjustment frame 3 could interfere with the extension cushion II. To achieve the desired length of the seat in the extended state, as shown in FIG. 7, increasing the height of the backrest fixing rod 42 is the optimal choice. This makes it possible to increase the height of the backrest fixing rod 42, allowing for the installation of a longer extension cushion II without compromising the structural stability of the seat. This is beneficial for achieving a greater seat depth when the extendable seat frame, or seat, is in the extended state, thereby transforming the seat into a bed. At the same time, when the extendable seat frame is in the extended state, the pulling extension plate 431 can cooperate with the backrest fixing rod 42 to provide longitudinal support for the extension cushion II, thereby effectively ensuring the structural stability of the seat.

In another example, the pulling extension plate 431 is a single unit. Specifically, as shown in FIG. 3 and FIG. 4, the pivot point between the backrest fixing rod 42 and the limiting rod 41 is defined as a first pivot point a, the pivot point between the backrest fixing rod 42 and the extension plate set 43 is defined as a second pivot point b, and the pivot point between the extension plate set 43 and the adjustment frame 3 is defined as a third pivot point c. When the extendable seat frame is in the extended state, the angle α between the line connecting the first pivot point a and the second pivot point b, and the line connecting the second pivot point b and the third pivot point c is α=150°-180°. In some examples, α=170°-180°. In this way, the pulling extension plate 431 can better cooperate with the backrest fixing rod 42 to provide support for the extension cushion II.

In other examples, there can be two or three pulling extension plates 431, with the two or three pulling extension plates 431 being pivotally connected in sequence.

As shown in FIG. 1 and FIG. 2, the adjustment frame 3 includes a front seat frame support 31 and a front fixing mount 32 that are connected to each other. The support rod 33 is fixedly connected to the front seat frame support 31. The front fixing mount 32 is pivotally connected to the extension plate set 43. Furthermore, the front fixing mount 32 is L-shaped, with one end fixedly connected to the front seat frame support 31 and the other end pivotally connected to the extension plate set 43, with the pivot point between them being the third pivot point c. As shown in FIG. 7, the L-shaped front fixing mount 32 can avoid excessive interference with the seat cushion I, allowing the seat cushion I to fit more closely to the front fixing mount 32 in the rearward direction. This, in turn, helps to reduce the gap between the seat cushion I and the extension cushion II when in the extended state, effectively improving the comfort of the seat. In some examples, the height of the front seat frame support 31 is less than 40 cm. In one or more examples, the height of the front seat frame support 31 is between 20 cm and 40 cm with two ends included.

In another example, the pulling extension plate 431 is provided with a first limiting shaft 4311, which is located between the second pivot point b and the third pivot point c. When the extendable seat frame is in the retracted state, the first limiting shaft 4311 rests against the backrest fixing rod 42. The first limiting shaft 4311 works with the backrest fixing rod 42 to limit the movement of the pulling extension plate 431, thereby assisting the driver 2 in limiting the movement of the adjustment frame 3, ensuring that the extendable seat frame remains stable in the retracted state.

As shown in FIG. 3 and FIG. 4, a second limiting shaft 321 is provided on the front fixing mount 32. When the extendable seat frame is in the extended state, the pulling extension plate 431 rests against the second limiting shaft 321. In some examples, the pulling extension plate 431 is provided with a limiting groove 4312 corresponding to the second limiting shaft 321, which is used to accommodate the second limiting shaft 321. The second limiting shaft 321 is used to limit and support the pulling extension plate 431, thereby improving the structural strength of the extension apparatus 4 when the extendable seat frame is in the extended state, and preventing the extension cushion II from collapsing.

In another example, the adjustment frame 3 is slidably connected to the base 1. As shown in FIG. 1, the fixed base 1 includes a front beam 12, a middle beam 13, and a guide rail 16. The guide rail 16 spans the front beam 12 and the middle beam 13 and is fixedly connected to both the front beam 12 and the middle beam 13. The extendable direction of the guide rail 16 is parallel to the extendable direction of the extendable seat frame, that is, the front-rear direction. The adjustment frame 3 is slidably connected to the guide rail 16. Specifically, the guide rail 16 is provided with a slide groove 161, and the bottom of the front seat frame support 31 is fitted with a second sliding member 311 that is compatible with the slide groove 161. In some examples, the slide groove 161 is a T-shaped slot.

In some examples, the driver 2 is a linear actuator, with the fixed part 21 of the driver 2 mounted on the middle beam 13, and the first sliding member 22 connected to the seat frame body 3. To improve the structural strength and stability of the extendable seat frame, the extendable seat frame includes two parallel guide rails 16. The middle beam 13 and the front beam 12 are parallel to each other, and the driver 2 is positioned between the two guide rails 16. Accordingly, two adjustment frames 3 are correspondingly set with the two guide rails 16, and the two adjustment frames 3 are linked by a linkage beam 5. During use, the fixed part 21 of the driver 2 is mounted on the middle beam 13, and the first sliding member 22 is connected to the linkage beam 5, to synchronously drive the two adjustment frames 3 to reciprocate along the front-rear direction relative to the guide rails 16. In some examples, the moving distance driven by the driver 2 is greater than 300 mm.

The base 1 may further include a rear beam 14, with the rear beam 14 positioned at the rear end, the front beam 12 positioned at the front end, and the middle beam 13 positioned between the front beam 12 and the rear beam 14. The rotating frame 41 is pivotally connected to the middle beam 13 or the guide rail 16. When the extendable seat frame is in the retracted state, the rotating frame 41 extends toward the rear beam 14, and the backrest fixing rod 42 and the extension plate set 43 are located in the area between the middle beam 13 and the rear beam 14. As shown in FIG. 7 and FIG. 8, the area between the middle beam 13 and the rear beam 14 is within the backrest region of the seat, used to store the extension cushion II and part of the seat cushion I in the retracted state, to restore the seat's conventional seating depth when the seat is in the normal sitting posture.

In another example, the base 1 further includes a longitudinal beam 11, with the front beam 12, middle beam 13, and rear beam 14 all fixedly connected to the longitudinal beam 11.

In another example, there are two longitudinal beams 11, positioned at the ends of the extendable direction of the front beam 12, middle beam 13, and rear beam 14, forming a structurally stable box-type base 1.

In another example, the longitudinal beams 11 are provided with armrest beams 111. The armrest beams 111, together with the longitudinal beams 11, front beam 12, middle beam 13, and rear beam 14, achieve an integrated structural design for the extendable seat frame, providing good structural stability and case of assembly. During operation, the armrest beams 111 and the longitudinal beams 11 are used to install the side panels of the seat (not shown in the figures), to conceal the internal structure of the seat frame from the sides.

In another example, the middle beam 13 is provided with a fixing plate 131, and the rotating frame 41 is pivotally connected to the fixing plate 131. Furthermore, the rotating frame 41 is provided with a third limiting shaft 411. When the extendable seat frame is in the retracted state, the third limiting shaft 411 rests against the fixing plate 131. The third limiting shaft 411 limits the rotating frame 41, and together with the first limiting shaft 4311, limits the pulling extension plate 431, assisting the drive mechanism 2 in stabilizing the position of the seat frame body 3, to ensure that the extendable seat frame is in a stable retracted state. The rotating frame 41, in cooperation with the front fixing mount 32, provides support for the backrest fixing rod 42 and the pulling extension plate 431 when in the extended state.

In another example, the base 1 may further include a backrest beam 15 positioned near the rear beam 14, and the backrest cushion III is mounted on the backrest beam 15.

As shown in FIG. 7 and FIG. 8, provided is also a seat, including the aforementioned seat cushion I, extension cushion II, backrest cushion III, and extendable seat frame. The seat cushion I is mounted on the adjustment frame 3, the extension cushion II is mounted on the backrest fixing rod 42, and the backrest cushion III is positioned above the seat cushion I and the extension cushion II. The space behind and below the backrest cushion III is defined as the storage area A. When the extendable seat frame is in the retracted state, the extension cushion II and at least part of the seat cushion I are positioned in the storage area A. When the extendable seat frame is in the extended state, the extension cushion II and the seat cushion I exit the storage area A, and the working surface of the extension cushion II is flush with the working surface of the seat cushion I.

As shown in FIG. 8, the working surface of the extension cushion II is its upper surface, and the working surface of the seat cushion I is its upper surface. This seat can switch between an extended state and a retracted state. In the retracted state, the seat functions as a regular seat, whereas in the extended state, the extension cushion II and the seat cushion I together significantly increase the seat depth, with the working surface of the extension cushion II being at the same level as the working surface of the seat cushion I, thereby enabling the seat to function as a true bed.

The extendable seat frame provided by examples in the present disclosure, for example as shown in FIGS. 1-8, has a stable structure and convenient posture adjustment, which can offer a greater seat depth when the seat equipped with this integrated extendable seat frame in the extended state. Further, the seat with the extendable seat frame, when in the extended state, offers a large seat depth and can be converted into a bed.

The technical solution of the examples above at least has the following advantages and beneficial effects:

The seat frame body of the present disclosure can more stably drive the lengthening part through the extension plate set while also being able to reduce the height of the seat frame body through the extension plate set. This makes it possible to increase the height of the lengthening part, which is beneficial for the extendable seat frame, that is, the seat, to achieve a greater seat depth when in the extended state, thereby enabling the transformation of the seat into a bed function. At the same time, when the extendable seat frame is in the extended state, the pulling extension plate can cooperate with the lengthening part to provide longitudinal support force for the extension cushion, thereby effectively ensuring the structural stability of the seat.

The examples of this present disclosure are implemented through the following technical solutions.

In some examples, provided is an extendable seat frame, including: a base, having a front end and a rear end in the extendable direction of the extendable seat frame; an adjustment frame, movably mounted on the fixed base; a driver, configured to drive the seat frame body to reciprocate between the front end and the rear end, so that the extendable seat frame can switch between an extended state and a retracted state; an extension apparatus, adjustably configured between the fixed base and the adjustment frame, the extension apparatus includes a rotating frame, a backrest fixing rod, and an extension plate set that are pivotally connected in sequence, wherein the rotating frame is pivotally connected to the base, and the extension plate set is pivotally connected to the adjustment frame.

When the extendable seat frame switches from the retracted state to the extended state, the adjustment frame moves toward the front end, and the extension plate set pulls the backrest fixing rod and the rotating frame to flip toward the front end.

In some examples, the pivot point between the backrest fixing rod and the rotating frame is defined as the first pivot point, the pivot point between the backrest fixing rod and the extension plate set is defined as the second pivot point, and the pivot point between the extension plate set and the adjustment frame is defined as the third pivot point. When the extendable seat frame is in the extended state, the angle between the line connecting the first pivot point and the second pivot point and the line connecting the second pivot point and the third pivot point is 150°-180°.

In some examples, the extension plate set includes at least one pulling extension plate, with one end of the pulling extension plate pivotally connected to the backrest fixing rod, and the other end pivotally connected to the adjustment frame.

In some examples, the adjustment frame is slidably connected to the base.

In some examples, the base includes a front beam, a middle beam, and a guide rail, where the guide rail extends across the front beam and the middle beam and is fixedly connected to both the front beam and the middle beam, with the extendable direction of the guide rail being parallel to the extendable direction of the extendable seat frame; the seat frame body is slidably connected to the guide rail.

In some examples, the base further includes a rear beam, with the rear beam positioned at the rear end, the front beam positioned at the front end, and the middle beam positioned between the front beam and the rear beam. The rotating frame is pivotally connected to the middle beam or the guide rail. When the extendable seat frame is in the retracted state, the rotating frame extends toward the rear beam, and the backrest fixing rod and the extension plate set are located in the area between the middle beam and the rear beam.

In some examples, the fixed base further comprises longitudinal beams, with the front beam, middle beam, and rear beam all fixedly connected to the longitudinal beams.

In some examples, the middle beam is provided with a fixing plate, and the rotating frame is pivotally connected to the fixing plate.

In some examples, the longitudinal beams are provided with armrest beams.

In some examples, the adjustment frame has a support rod that is extendable in the extendable direction of the extendable seat frame, with the front end of the support rod fitted with a roller that is in rolling contact with the ground.

In some examples, the adjustment frame includes a front seat frame support and a front fixing mount that are connected to each other, with the support rod fixedly connected to the front seat frame support; the front fixing mount is pivotally connected to the extension plate set.

In some examples, the front fixing mount is L-shaped, with one segment fixedly connected to the front seat frame support and the other segment pivotally connected to the extension plate set.

In some examples, the extension plate set includes a pulling extension plate, and the pulling extension plate is provided with a first limiting shaft; when the extendable seat frame is in the retracted state, the first limiting shaft rests against the backrest fixing rod.

In some examples, the extension plate set includes a pulling extension plate, and the front fixing mount is provided with a second limiting shaft; when the extendable seat frame is in the extended state, the pulling extension plate rests against the second limiting shaft.

FIGS. 9-13 illustrate some other examples of an extendable seat frame. As shown in FIG. 9, the extendable seat frame includes a seat frame main body 901, a hidden extension apparatus 902, and a fixed base 903. Here, the seat frame main body 901 is set to move relatively above the fixed base 903, and the hidden extension apparatus 902 is rotatably connected to the seat frame main body 901. The hidden extension apparatus 902 is also rotatably connected to the fixed base 903, enabling the extendable seat frame to switch between a retracted state and an extended state. FIGS. 9-10 show the transformation process of the extendable seat frame from a retracted state to a fully extended state. In this example, the hidden extension apparatus 902 is a flip-type structure, hidden between the seat frame main body and the backrest frame in the retracted state, occupying less space and facilitating user storage. In the extended state, the hidden extension apparatus 902 can flip to an almost horizontal state, cooperating with the seat frame main body 901, thereby extendable the overall length of the seat frame structure, avoiding gaps behind the seat frame main body, ensuring user comfort and high safety in use.

Specifically, as shown in FIGS. 9-10, the hidden extension apparatus 902 includes an extension part 921 and two rotating frames 922. As shown in FIG. 9, the extension part 921 is stored behind the seat frame main body 901 in the retracted state. Depending on the actual space limitations, the extension part 921 may be placed vertically or at a certain angle to the vertical direction. As shown in FIGS. 9-10, the seat frame main body 901 can move in the extendable direction, and the extension part 921 is rotatably connected to the end of the seat frame main body 901 that is away from the extendable direction, allowing the extension part 921 to rotate as the seat frame main body 901 rotates. Finally, as shown in FIG. 10, when the seat frame main body 901 moves to the final extended state, the extension part 921 also flips to a fully extended state, i.e., the extended seat frame switches to the extended state. Moreover, in another example, the extension part 921 is placed parallel to the seat frame main body 901 in the extended state to ensure the overall balance of the seat frame structure. In another example, the extension part 921 may also be set at an inclined angle of 1˜3° to the plane where the seat frame main body 901 is located, and the end of the extension part 921 away from the seat frame main body 901 is higher than the end connected to the seat frame main body 901, further enhancing support stability and comfort.

Specifically, the extendable seat frame may be applied to a furniture such as a sofa, a chair, or a seat. In another example, the overall depth of the sofa, that is, the depth of the armrest, may be set to 900˜1000 mm. Due to the limited depth of the sofa, the length of the extension part 921 in the extendable direction may be set to 200˜350 mm. On one hand, this ensures that the extension part has sufficient length to compensate for the gap formed after the seat frame main body 901 extends, preventing the user from falling into the gap and reducing discomfort due to lack of support at the user's lower back. On the other hand, it avoids the overly long extension part 921 from being bumped by internal structures or the ground during storage, thereby extendable the lifespan of the extendable seat frame. In another example, the depth of the armrest may be set to 950 mm, and the length of the extension part 921 may be set to 280 mm, providing high comfort and user satisfaction.

Specifically, each rotating frame 922 is rotatably connected to the extension part 921 and is also rotatably connected to the fixed base 903, allowing the extension part 921 to freely flip as the seat frame main body 901 moves, without being easily restricted by rotation. Moreover, two rotating frames 922 are respectively set on both sides of the extension part 921 to ensure balance and stability during rotation. In another example, based on the support strength and structural stability, only one rotating frame 922 may be set, saving material costs.

Furthermore, as shown in FIGS. 11 and 12, the rotating frame 922 may be set as a bent structure, but both ends of the rotating frame 922 remain in the same plane. The bent section of the rotating frame 922 is rotatably connected to the extension part 921. As shown in FIG. 11, based on the direction shown in the figure, the bent section of the rotating frame 922 bends downwards, allowing the bent section to be rotatably connected to the end of the extension part 921 that is far from the seat frame main body 901. At the same time, the part of the rotating frame 922 outside the bent section forms an avoidance section. The placement position of this avoidance section in the retracted state should be higher than the end of the bent section to ensure that the avoidance section can effectively avoid other existing structures in the furniture (e.g., sofa), preventing the extension part 921 from being blocked during storage, facilitating user storage. In another example, the rotating frame 922 may also be a straight rod, and the present disclosure does not limit this; as long as the rotating frame 922 does not collide with or obstruct surrounding structures in the retracted state.

Specifically, at least one set of rotating connection components is also set at the connection between the extension part 921 and the seat frame main body 901 to rotatably connect the extension part 921 to the seat frame main body 901. As shown in FIGS. 11-12, the rotating connection component includes a first connector 911 and a second connector 9210. The first connector 911 is fixed to the end face of the seat frame main body 901, while the second connector 9210 is fixed to the extension part 921. The first connector 911 and the second connector 9210 are rotatably connected to each other, thus achieving the rotational connection between the extension part 921 and the seat frame main body 901. In this example, two sets of rotating connectors are set, and a pin is set between the first connector 911 and the second connector 9210 in each set. The pin simultaneously penetrates the first connector 911 and the second connector 9210, allowing both the first connector 911 and the second connector 9210 to rotate around the pin, providing good rotational flexibility and preventing jamming.

Specifically, in another example, the second connector 9210 is set as a bent L-shaped piece. One side of the L-shaped piece is fixedly connected to the extension part 921, with a large contact area and reliable connection, while the other side of the L-shaped piece is rotatably connected to the first connector 911, with a simple structure and flexible rotation.

Specifically, as shown in FIG. 12, a third connector 9211 is also fixedly set on the extension part 921. The third connector 9211 is used for rotatable connection with the rotating frame 922. The number of third connectors 211 is the same as the number of rotating frames 922 set, thus achieving stable rotation between the extension part 921 and the rotating frame 922. In another example, the second connector 9210 and the extension part 921 may be set as an integrated structure, or the third connector 9211 and the extension part 921 may be set as an integrated structure. Alternatively, the second connector 9210, the third connector 9211, and the extension part 921 may all be set as an integrated structure, reducing the number of assembly parts and improving assembly and production efficiency.

Specifically, in another example, the second connector 9210 may be directly set as a groove structure, that is, the second connector 9210 is directly formed by grooving the end face of the extension part 921. The groove structure is located on the end face of the extension part 921, and the first connector 1 is inserted into the groove structure. The groove structure may rotate relative to the first connector 911, further simplifying the structure, reducing the number of parts needed for assembly, and lowering costs. Moreover, the pin between the first connector 911 and the second connector 9210 may also be a structure of the extension part 921 itself. That is, when grooving the groove structure, two pin-shaped protrusions are reserved on both sides of the groove structure, allowing the pin-shaped protrusions to be rotatably connected to the first connector 911. The structure is simpler, and rotation is more convenient. The groove structure, being an integral part of the extension part 921, is also less likely to have loose parts, ensuring good rotational stability.

Specifically, the extendable seat frame may also include a driver 904, as shown in FIGS. 9 and 13. The driver 904 is set on the fixed base 903, and the output end of the driver 904 is also relatively movably connected to the seat frame main body 901, thereby driving the seat frame main body 901 to reciprocate in the extendable direction, achieving the switch between the retracted state and the extended state of the extendable seat frame without the need for the user to manually drag the seat frame main body 901, saving effort and providing high user satisfaction. In one example, the driver 904 may be a drive motor, occupying a small space, with sufficient power and a long service life. In some examples, the driver 904 may be the same driver 2 as shown in FIG. 1.

Specifically, as shown in FIG. 13, a sliding apparatus is set between the seat frame main body 901 and the fixed base 903. The sliding apparatus includes a slide rail component 905 and a sliding component 906. The top of the sliding component 906 is fixedly connected to the seat frame main body 901, and the slide rail component 905 is relatively slidably set with the sliding component 906. The slide rail component 905 is fixedly connected to the driver 904, so that when the sliding component 906 slides relative to the slide rail component 905, it drives the seat frame main body 901 to slide in the extendable direction relative to the fixed base 903.

Specifically, as shown in FIG. 13, the slide rail component 905 includes a first guide rail 951 and two second guide rails 952. The second guide rails 952 are located on both sides of the first guide rail 951 and are set parallel to the first guide rail 951, playing an auxiliary guiding role. In some examples, the extendable direction of the first guide rail 951 and the second guide rail 952 is consistent with the extendable direction, limiting the sliding direction of the seat frame main body 901, ensuring that all components inside the sliding component 906 slide in the extendable direction, avoiding sliding jams or even getting stuck. At the same time, the two second guide rails 952 are respectively located on both sides, effectively playing a balancing role, maintaining the overall center of gravity balance of the slide rail component 905, which is conducive to improving overall stability.

In some examples, the sliding component 906 includes a first sliding part 961 and two second sliding part 962. The first sliding part 961 is driven by the driver 904, allowing it to slide back and forth along the first guide rail 951 in the extendable direction. The second sliding part 962 are fixedly connected to the first sliding part 961. Thus, when the first sliding part 961 is driven to move, the second sliding part 962 slide along with it, enabling the second sliding part 962 to slide relative to the second guide rail 952. At the same time, to further limit any deviation in the sliding direction, each second sliding part 962 is slidably connected to a corresponding second guide rail 952, ensuring that the sliding direction of the second sliding part 962 follows the extendable direction of the second guide rail 952, that is, moving back and forth in the extendable direction. In this sliding mechanism, the first guide rail 951 and the first sliding part 961 act as the primary sliding group, driven by the driver 904 to perform active relative sliding motion, while the second guide rail 952 and the second sliding part 962 act as the auxiliary sliding group, being passively moved in relative sliding motion. Additionally, the top of the second sliding part 962 is equipped with a support part, used to fix the second sliding part 962 to the seat frame main body 901, thus allowing the first sliding part 961 and the second sliding part 962 to cooperate with each other, further driving the seat frame main body 901 to perform reciprocating sliding, ensuring balance and stability.

In one example, an extendable push rod is set between the seat frame main body 901 and the fixed base 903. This extendable push rod includes a telescopic section and a fixed section that are telescopically connected. One end of the telescopic section is connected to the seat frame main body 901, while one end of the fixed section is connected to the driver 904. Thus, when the driver 904 outputs power, the telescopic section can move telescopically relative to the fixed section, further driving the seat frame main body 901 to move relative to the fixed base 903.

In another example, the maximum moving distance that the seat frame main body 901 may extend is 450˜600 mm. That is, the position of the seat frame main body 901 in the extended state is moved forward by 450˜600 mm compared to its position in the retracted state, greatly increasing the extendable distance and meeting the user's needs for different seat frame lengths. In another example, the maximum moving distance may be 500 mm. However, this present disclosure is not limited to this moving distance. Depending on actual needs, the seat frame main body 901 may have various different extendable distances.

The present disclosure also provides a piece of furniture, including a first cushion, a second cushion, and the above-described extendable seat frame. The first cushion is set above the seat frame main body 901, while the second cushion is set above the extension part 921. In the retracted state, the second cushion is placed behind the seat frame main body 901 along with the extension part 921. In the extended state, the upper surface of the first cushion and the upper surface of the second cushion are on the same horizontal plane, ensuring the overall flatness of the cushions and high comfort in use.

According to the examples above, the present disclosure adds a flip-type extension part behind the seat frame main body, which can greatly increase the extendable distance of the seat frame main body. At the same time, as the seat frame main body extends, it drives the extension part behind to flip, compensating for the gap formed when the seat frame main body moves to the extended state. The movement is smooth and convenient, with good comfort and high safety. Additionally, the extension part may be hidden behind the seat frame main body in the retracted state, occupying less space, improving space utilization, and facilitating user storage.

Additionally, the present disclosure sets a rotating frame between the extension part and the fixed base for rotational connection, allowing the extension part to flexibly rotate as the seat frame main body extends, making extension convenient and rotation stability good.

Furthermore, the first sliding part is driven by the driver to slide, which in turn drives the second sliding part to slide. That is, the second sliding part plays an auxiliary sliding role, and the combination of active and passive sliding ensures that the sliding direction of the seat frame main body is restricted by multiple sliding structures, providing high sliding stability, easy adjustment, and good flexibility.

Other implementation solutions of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any variations, uses, or adaptations of the disclosure following the general principles thereof and including such departures from the disclosure as come within known or customary practice in the art. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be appreciated that the disclosure is not limited to the exact construction that has been described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. It is intended that the scope of the disclosure only be limited by the appended claims.

Claims

1. An extendable seat frame, comprising:

a fixed base;

a seat frame main body, configured to move relatively above the fixed base; and

an extension apparatus, configured to be rotatably connected to the fixed base and rotatably connected to the seat frame main body so as to enable the extendable seat frame to switch between a retracted state and an extended state,

wherein the extension apparatus comprises at least an extension part, one end of the extension part is rotatably connected to an end of the seat frame main body that is away from an extending direction, and the extension part is configured to drive the extension part to flip in response to the seat frame main body moving towards the extending direction.

2. The extendable seat frame according to claim 1, wherein a length of the extension part is within 200˜350 mm.

3. The extendable seat frame according to claim 1, wherein a maximum moving distance of the seat frame main body is within 450˜600 mm.

4. The extendable seat frame according to claim 1, wherein the extension apparatus further comprises at least one rotating frame that is rotatably connected to the extension part and rotatably connected to the fixed base.

5. The extendable seat frame according to claim 4, wherein at least one rotating connection component is placed at a connection point of the extension part with the seat frame main body, the at least one rotating connection component comprises a first connector and a second connector, the first connector is fixed to an end face of the seat frame main body, and the second connector is fixed to the extension part, and the first connector and the second connector are rotatably connected correspondingly.

6. The extendable seat frame according to claim 5, wherein the second connector is an L-shaped piece, with one side fixed to the extension part and the other side rotatably connected to the first connector.

7. The extendable seat frame according to claim 5, wherein at least one third connector is fixed on the extension part, with the third connector rotatably connected correspondingly to a rotating frame.

8. The extendable seat frame according to claim 7, wherein both the second connector and the third connector are integrally structured with the extension part.

9. The extendable seat frame according to claim 5, wherein the second connector has a groove structure located at an end face of the extension part, the first connector is inserted into the groove structure, and the groove structure is configured to rotate relative to the first connector.

10. The extendable seat frame according to claim 1, wherein the extendable seat frame further comprises a driver that is placed on the fixed base, an output end of the driver is movably connected to the seat frame main body, and the driver is configured to drive movement of the seat frame main body.

11. The extendable seat frame according to claim 10, wherein a sliding apparatus is placed between the seat frame main body and the fixed base, the sliding apparatus comprises a slide rail component and a sliding component configured to slide relatively, a top of the sliding component is fixedly connected to the seat frame main body, the driver is drivingly connected to the slide rail component, and the driver is configured to drive the sliding component to slide relative to the slide rail component.

12. The extendable seat frame according to claim 11, wherein the slide rail component comprises a first guide rail and at least one second guide rail, and the sliding component comprises a first slider and at least one second slider, the output end of the driver is connected to the first guide rail and configured to drive the first slider to slide relative to the first guide rail, the first slider is fixedly connected to the second slider, and a top of the second slider is fixedly connected to the seat frame main body and drives the second slider and the seat frame main body to slide reciprocally along the extending direction.

13. The extendable seat frame according to claim 10, wherein an extendable push rod is placed between the seat frame main body and the fixed base, the extendable push rod comprises an extendable section and a fixed section connected telescopically, one end of the extendable section is connected to the seat frame main body, and one end of the fixed section is connected to the driver, and the driver is configured to drive the extendable section to move telescopically relative to the fixed section.

14. A furniture, comprising:

a first cushion,

a second cushion, and

an extendable seat frame comprising: a fixed base; a seat frame main body, configured to move relatively above the fixed base; and an extension apparatus, configured to be rotatably connected to the fixed base and rotatably connected to the seat frame main body so as to enable the extendable seat frame to switch between a retracted state and an extended state, wherein the extension apparatus comprises at least an extension part, one end of the extension part is rotatably connected to an end of the seat frame main body that is away from an extending direction, and the extension part is configured to drive the extension part to flip in response to the seat frame main body moving towards the extending direction,

wherein the first cushion is placed above the seat frame main body, the second cushion is placed above the extension part, an upper surface of the first cushion and an upper surface of the second cushion are on a same horizontal plane.

15. The furniture according to claim 14, wherein a length of the extension part is within 200˜350 mm.

16. The furniture according to claim 14, wherein a maximum moving distance of the seat frame main body is within 450˜600 mm.

17. The furniture according to claim 14, wherein the extension apparatus further comprises at least one rotating frame that is rotatably connected to the extension part and rotatably connected to the fixed base.

18. The furniture according to claim 17, wherein at least one rotating connection component is placed at a connection point of the extension part with the seat frame main body, the at least one rotating connection component comprises a first connector and a second connector, the first connector is fixed to an end face of the seat frame main body, and the second connector is fixed to the extension part, and the first connector and the second connector are rotatably connected correspondingly.

19. The furniture according to claim 18, wherein the second connector is an L-shaped piece, with one side fixed to the extension part and the other side rotatably connected to the first connector.

20. The furniture according to claim 18, wherein at least one third connector is fixed on the extension part, with the third connector rotatably connected correspondingly to a rotating frame.