FOLDABLE SEAT

A foldable seat is disclosed. The foldable seat includes a cushion unit, a backrest unit and a gear adjustment unit. The backrest unit includes at least two connecting rods each including a first rotating rod and a second rotating rod. The gear adjustment unit includes gear teeth, a turntable and a clamping structure, a second end of the first rotating rod is provided with a first hinge shaft, the gear teeth is arranged at an end portion of the second rotating rod, the clamping structure is rotatably connected to the first rotating rod, and the turntable is arranged on the first hinge shaft.

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Description
CROSS-REFERENCE TO RELATED APPLICATION

This application is filed on the basis of Chinese patent application No. 2022230529758 filed Nov. 16, 2022, and claims priority of the Chinese patent application, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The disclosure relates to the field of seating devices, and particularly to a foldable seat.

BACKGROUND

At present, people have higher and higher requirements for seating devices, and need the seating devices to meet the requirements of portability. For common portable seats, the backrest can be rotatably folded towards the cushion, so as to reduce the volume and facilitate portability. Based on the characteristics of hinged rotation, when a seat pack is additionally arranged on the cushion, a rotation angle of the backrest is limited by the seat pack. When the backrest rotates to an extreme position, there is still a certain angle between the backrest and the cushion, which is not beneficial for reducing the volume of the seat. Meanwhile, in most foldable seats, the opening angle between the backrest and the cushion is constant, which is not beneficial for users to adjust the opening angle between the backrest and the cushion according to their own conditions.

In the related art, the opening angle between the backrest and the cushion can be adjusted in multiple gears, but movement or positioning needs to be realized by an additional operating rod in the gear adjustment, which is complicated in structure and involves many parts, thus being not beneficial for production and maintenance.

SUMMARY

In order to solve at least one of the above technical problems, the disclosure provides a foldable seat, and the following technical solution is used.

The disclosure provides a foldable seat including a cushion unit, a backrest unit and a gear adjustment unit. The cushion unit is horizontally arranged, and the cushion unit is configured for supporting buttocks of a user. The backrest unit includes at least two connecting rods connected with the cushion unit, and each of the connecting rods includes a first rotating rod and a second rotating rod. The first rotating rod and the second rotating rod are connected through the gear adjustment unit, the gear adjustment unit includes a plurality of gear teeth, a turntable and a clamping structure, a first end of the first rotating rod is connected with the cushion unit, a second end of the first rotating rod is provided with a first hinge shaft, an end portion of the second rotating rod is arranged on the first hinge shaft, the gear teeth are arranged at the end portion of the second rotating rod and distributed in an arc shape, the clamping structure is rotatably connected to the first rotating rod, a clamping groove is arranged on the clamping structure, the clamping groove is configured to be engaged with the gear teeth, the turntable is arranged on the first hinge shaft, and the turntable is capable of pushing the clamping structure, so that the clamping structure is connected with or separated from the gear teeth.

The embodiments of the disclosure has at least the following beneficial effects. In the disclosure, the gear adjustment unit is located in a middle portion of the connecting rod, when the second rotating rod rotates to be approximately horizontal with the cushion unit, there is still a certain space between the second rotating rod and the cushion unit, which is convenient for contracting a volume of the foldable seat as much as possible under a condition that a seat pack is arranged on the cushion unit, thus facilitating carrying. When the first rotating rod and the second rotating rod rotate relatively, the turntable rotates together. When a first abutting portion is connected with the clamping structure, the foldable seat is capable of being contracted to a minimum volume or reset. When the gear tooth is connected with the clamping structure, the second rotating rod is capable of being adjusted in multiple gears, and is locked in a position after adjustment, so that an angle between the second rotating rod and the cushion unit is adjusted in multiple gears, thus adapting to different sitting postures of different users by a simple structure.

In some embodiments of the disclosure, the turntable includes a first abutting portion, a second abutting portion and a concave portion, a distance between the first abutting portion and the first hinge shaft is not less than a distance between a crest of the gear teeth and the first hinge shaft, a distance between the second abutting portion and the first hinge shaft is not greater than a distance between a root of the gear teeth and the first hinge shaft, the concave portion is arranged between the first abutting portion and the second abutting portion, a stop rod is arranged on the second rotating rod, and the stop rod is located in a range of the concave portion.

In some embodiments of the disclosure, the second end of the first rotating rod is hollow, and the clamping structure, the turntable and the end portion of the second rotating rod are all arranged inside the second end of the first rotating rod.

In some embodiments of the disclosure, a second hinge shaft is arranged on the first rotating rod, the clamping structure is arranged on the second hinge shaft, a torsion spring is arranged on the second hinge shaft, and the torsion spring is connected with the clamping structure.

In some embodiments of the disclosure, the foldable seat further includes an armrest unit, the armrest unit includes a third rotating rod and a fourth rotating rod, a first end of the third rotating rod is connected with the cushion unit, a second end of the third rotating rod is hinged with the fourth rotating rod, and the fourth rotating rod is capable of rotating towards the cushion unit.

In some embodiments of the disclosure, the connecting rod forms an angle with the cushion unit.

In some embodiments of the disclosure, a plurality of positioning rods are arranged on the cushion unit, and each of the positioning rods are connected with a respective one of first rotating rods.

In some embodiments of the disclosure, a middle portion of the cushion unit is provided with a cross beam.

In some embodiments of the disclosure, the foldable seat further includes a seat cover, the seat cover is detachably connected with the foldable seat, the seat cover covers a surface of the foldable seat, and a zipper is arranged on the seat cover.

In some embodiments of the disclosure, a seat pack and a backrest pack are arranged in the seat cover, the seat pack is arranged on the cushion unit, and the backrest pack is arranged on the backrest unit.

The additional aspects and advantages of the disclosure will be partially provided in the following description, and will partially be apparent in the following description, or learned by practice of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the disclosure will be apparent and easily understood from the descriptions of the embodiments with reference to the following drawings, wherein:

FIG. 1 is a schematic structural diagram of a foldable seat of the disclosure;

FIG. 2 is a sectional view of a gear adjustment unit in the foldable seat of the disclosure;

FIG. 3 is an exploded view of the gear adjustment unit in the foldable seat of the disclosure; and

FIG. 4 is a schematic structural diagram of a turntable in the foldable seat of the disclosure.

 REFERENCE NUMERALS

    • 101 refers to cushion unit; 102 refers to cross beam;
    • 201 refers to backrest unit; 202 refers to first rotating rod; 203 refers to second rotating rod; 204 refers to positioning rod;
    • 301 refers to gear adjustment unit; 302 refers to gear tooth; 303 refers to turntable; 304 refers to clamping structure; 305 refers to first hinge shaft; 306 refers to clamping groove;
    • 401 refers to first abutting portion; 402 refers to second abutting portion; 403 refers to concave portion; 404 refers to stop rod; 405 refers to second hinge shaft;
    • 501 refers to armrest unit; 502 refers to third rotating rod; and 503 refers to fourth rotating rod.

DETAILED DESCRIPTION

The embodiments of the disclosure will be described in detail with reference to FIG. 1 to FIG. 4 in this part, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals throughout the drawings denote the same or similar elements or elements having the same or similar functions. The embodiments described hereinafter with reference to the drawings are exemplary, and are only used to explain the disclosure, but should not be understood as limiting the disclosure.

In the description of the disclosure, it should be understood that the orientation or position relationship indicated by the terms “center”, “middle”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “up”, “down”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, and the like is based on the orientation or position relationship shown in the drawings, it is only for the convenience of description of the disclosure and simplification of the description, and it is not to indicate or imply that the indicated device or element must have a specific orientation, and be constructed and operated in a specific orientation. Therefore, the terms should not be understood as limiting the disclosure. The features defined by “first” and “second” are used to distinguish between feature names, rather than having special meanings. In addition, the features defined by “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the disclosure, unless otherwise specified, the term “multiple” refers to being two or more.

In the description of the disclosure, it should be noted that the terms “install”, “interconnect” and “connect” should be understood in a broad sense unless otherwise specified and defined. For example, they may be fixed connection, removable connection or integrated connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium; or may be communication between interiors of two elements. The specific meanings of the above terms in the disclosure may be understood in a specific case by those of ordinary skills in the art.

An embodiment of the disclosure provides a foldable seat, and the foldable seat includes a cushion unit 101, a backrest unit 201 and a gear adjustment unit 301.

As shown in FIG. 1, the cushion unit 101 is horizontally arranged, and a bottom portion of the cushion unit 101 is connected with a bench, a grandstand seat and other structures, so as to improve comfort. It can be understood that, in order to facilitate connection of the bottom portion of the cushion unit 101 with various solid structures, the bottom portion of the cushion unit 101 is not provided with a supporting leg, which avoids the supporting leg from occupying a large space after a volume of the foldable seat is contracted and being not beneficial for carrying.

In some examples, the cushion unit 101 includes a frame structure, a middle portion of the frame structure is provided with a cross beam 102 for reinforcing the cushion unit 101, thus improving the stability in structure. The cross beam 102 can also play a supporting role for buttocks of a user.

The backrest unit 201 is configured for supporting the back of a user, the backrest unit 201 includes at least two connecting rods for connecting with the cushion unit 101. It can be understood that each connecting rod is configured for supporting the back of the user. The connecting rods need to have approximately the same movement relative to the cushion unit 101, so as to finish folding. Therefore, the connecting rods are connected with each other to form a whole. Specifically, each connecting rod includes a first rotating rod 202 and a second rotating rod 203. The first rotating rod 202 is rotatably connected with the second rotating rod 203, the first rotating rod 202 is fixedly connected with the cushion unit 101, and a backrest beam is arranged on the second rotating rod 203, so that the movement consistency between the second rotating rods 203 is ensured.

In some examples, the first rotating rod 202 has a certain length, which means that there is a certain distance between a position where the first rotating rod 202 is ratably connected with the second rotating rod 203 and the cushion unit 101. When a seat pack is arranged on cushion unit 101, the second rotating rod 203 is still capable of rotating to be in a state approximately parallel to the cushion unit 101 to contract the volume of the foldable seat as much as possible, thus facilitating carrying. Specifically, the length of the first rotating rod 202 is set according to a thickness of the seat pack to be set.

In some examples, the connecting rod forms an angle with the cushion unit 101, which means that the first rotating rod 202 forms an angle with the cushion unit 101. When the second rotating rod 203 is located in an extreme position, the first rotating rod 202 is approximately parallel with the second rotating rod 203. In this case, the second rotating rod 203 also forms an angle with the cushion unit 101. Specifically, the angle between the connecting rod and the cushion unit 101 is set according to usage habit of the user, to ensure the comfort of the foldable seat.

In some examples, in order to further ensure the relative position stability between the connecting rod and the cushion unit 101, a plurality of positioning rods 204 are arranged on the cushion unit 101, and a number of the positioning rods 204 corresponds to a number of the connecting rods. One end of the positioning rod 204 is connected to the cushion unit 101, and the other end of the positioning rod is connected with the first rotating rod 202, thus forming a stable connection structure.

As shown in FIG. 2 to FIG. 3, rotary connection between the first rotating rod 202 and the second rotating rod 203 is realized by the gear adjustment unit 301. The gear adjustment unit 301 can position the second rotating rod 203 at different angles under a condition of ensuring the rotary connection, so as to realize multi-rotation-gear adjustment. It can be understood that the first end of the first rotating rod 202 is connected with the cushion unit 101, and the gear adjustment unit 301 is arranged at a joint between the second end of the first rotating rod 202 and the end portion of the second rotating rod 203.

Further, the gear adjustment unit 301 includes gear teeth 302, a turntable 303 and a clamping structure 304. The second end of the first rotating rod 202 is provided with a first hinge shaft 305, and the end portion of the second rotating rod 203 is arranged on the first hinge shaft 305. Since the first rotating rod 202 has a fixed position, the second rotating rod 203 is capable of rotating around the first hinge shaft 305.

A plurality of gear teeth 302 are arranged at the end portion of the second rotating rod 203, and the end portion of the second rotating rod 203 is arranged in an arc shape, which means that the gear teeth 302 are distributed in an arc shape. Meanwhile, the clamping structure 304 is arranged on the first rotating rod 202, the clamping structure 304 is capable of rotating on the first rotating rod 202, and a clamping groove 306 is arranged on the clamping structure 304. It can be understood that the clamping groove 306 is configured to be engaged with the gear tooth 302. Specifically, the clamping structure 304 includes an arc-shaped extension portion, an end portion of the arc-shaped extension portion is oriented to the first hinge shaft 305, and the clamping groove 306 is arranged at the end portion of the arc-shaped extension portion. When the clamping groove 306 is engaged with the gear tooth 302, the second rotating rod 203 is capable of rotating unidirectionally, so that the currently engaged gear tooth 302 pushes the clamping structure 304 to rotate in a small range. During rotation of the clamping structure 304, the currently engaged gear tooth 302 is gradually separated from the clamping groove 306, and the clamping structure 304 always tends to rotate towards the first hinge shaft 305, so that the adjacent gear tooth 302 is clamped into the clamping groove 306. At the moment, the angle between the first rotating rod 202 and the second rotating rod 203 is changed, thereby finishing gear adjustment once. It can be understood that, under a condition that the gear tooth 302 is engaged, when the first rotating rod 202 rotates in an opposite direction, the clamping structure 304 locks the currently engaged gear tooth 302 due to the limitation of the arc-shaped extension portion of the clamping structure 304. That is, when the user leans the back against the backrest, the second rotating rod 203 tends to rotate in an opposite direction, but the angle between the second rotating rod 203 and the cushion unit 101 remains unchanged as the clamping structure 304 clamps the currently engaged gear tooth 302, so that the foldable seat is maintained at a current gear, thereby ensuring the effectiveness of gear adjustment.

The turntable 303 is arranged on the first hinge shaft 305, and the turntable 303 is capable of rotating on the first hinge shaft 305, and the turntable 303 is configured for resetting the second rotating rod 203, so as to readjust the gear of the foldable seat. Further, the turntable 303 is capable of pushing the clamping structure 304, so that the clamping structure 304 is separated from the gear tooth 302, so as to enable the second rotating rod 203 to freely rotate relative to the first rotating rod 202. In this way, the second rotating rod 203 can be reset, or a storage operation of the foldable seat is finished.

As shown in FIG. 3, in some examples, the turntable 303 includes a first abutting portion 401, a second abutting portion 402 and a concave portion 403. A stop rod 404 is arranged on the second rotating rod 203, and the stop rod 404 is located in a range of the concave portion 403. During rotation of the second rotating rod 203, the stop rod 404 abuts against an edge of the concave portion 403, thus driving the turntable 303 to rotate, so that the parts of the turntable 303 cooperates with the gear tooth 302 and the clamping structure 304 to finish gear adjustment and reset.

A distance between the first abutting portion 401 and the first hinge shaft 305 is not less than a distance between a crest of the gear tooth 302 and the first hinge shaft 305, which means that the first abutting portion 401 is capable of pushing the clamping structure 304 to rotate, so as to be separated from the gear tooth 302. A distance between the second abutting portion 402 and the first hinge shaft 305 is not greater than a distance between a root of the gear teeth 302 and the first hinge shaft 305, which avoids the second abutting portion 402 from affecting engagement between the clamping structure 304 and the gear teeth 302. The concave portion 403 is arranged between the first abutting portion 401 and the second abutting portion 402, the first abutting portion 401 forms a first edge of the concave portion 403, and the second abutting portion 402 forms a second edge of the concave portion 403.

When the second rotating rod 203 is located in an extreme position, the second rotating rod 203 is approximately parallel to the first rotating rod 202, and the gear tooth 302 corresponding to the clamping groove 306 protrudes from the second abutting portion 402. At the moment, the clamping structure 304 is engaged with the gear tooth 302 in the corresponding position, the second rotating rod 203 is located at an extreme gear, and the stop rod 404 does not work. When the second rotating rod 203 rotates, the clamping structure 304 can be engaged with the adjacent gear tooth 302, and the second rotating rod 203 is located at a first angular gear. When the second rotating rod 203 continuously rotates, the clamping structure 304 can be continuously engaged with the next adjacent gear tooth 302, and the second rotating rod 203 is located at a second angular gear. In this way, the gear adjustment is carried out in sequence until the stop rod 404 abuts against the first edge of the concave portion 403. The second rotating rod 203 continuously rotates, the gear tooth 302 corresponding to the clamping groove 306 is hidden in the first abutting portion 401, and the clamping structure 304 is pushed away from the gear tooth 302. At the moment, the second rotating rod 203 can be folded to be approximately parallel to the cushion unit 101, or the second rotating rod 203 rotates in an opposite direction to realize gear reset.

Specifically, during gear reset, the stop rod 404 gradually abuts against the second edge of the concave portion 403 and pushes the turntable 303 to rotate together. When the second rotating rod 203 rotates to the extreme position, the first abutting portion 401 is separated from the clamping structure 304, and the clamping groove 306 is engaged with the gear tooth 302 corresponding to the extreme position, so as to finish the gear reset. It can be understood that the number of gears is determined by the specific length between the first abutting portion 401 and the second abutting portion 402.

In some examples, the second end of the first rotating rod 202 is hollow, and the clamping structure 304, the turntable 303 and the end portion of the second rotating rod 203 are all arranged inside the second end of the first rotating rod 202, which avoids the gear adjustment unit 301 from being exposed and prevents operation of the gear adjustment unit 301 from being interfered with by an external structure.

In some examples, a second hinge shaft 405 is arranged on the first rotating rod 202, and the clamping structure 304 is arranged on the second hinge shaft 405. It can be understood that the second hinge shaft 405 is also located inside the second end of the first rotating rod 202. The clamping structure 304 is capable of rotating around the second hinge shaft 405. Since the clamping structure 304 needs to always tend to rotate towards the first hinge shaft 305, so as to ensure that the clamping groove 306 of the clamping structure 304 can be automatically engaged with the corresponding gear tooth 302 when the gear tooth 302 is exposed outside the turntable 303, a torsion spring is arranged on the second hinge shaft 405, and the torsion spring is connected with the clamping structure 304.

In some examples, the foldable seat further includes an armrest unit 501, and when the foldable seat is folded and stored, the armrest unit 501 can also be folded, thus further contracting the volume of the foldable seat. Specifically, the armrest unit 501 includes a third rotating rod 502 and a fourth rotating rod 503, a first end of the third rotating rod 502 is connected with the cushion unit 101, and a second end of the third rotating rod 502 is hinged with the fourth rotating rod 503. During storage, the fourth rotating rod 503 rotates first towards the cushion unit 101, and then the second rotating rod 203 rotates, so that the fourth rotating rod 503 is located between the backrest unit 201 and the cushion unit 101.

The third rotating rod 502 has a certain length, which means that, when the fourth rotating rod 503 rotates to be approximately parallel to the cushion unit 101, there is still a certain distance between the fourth rotating rod 503 and the cushion unit 101, which is convenient for arranging the seat pack on the cushion unit 101.

In some examples, the foldable seat further includes a seat cover, and the seat cover covers the foldable seat. On one hand, the seat cover can protect all solid structures of the foldable seat, and provide a certain buffer for collision with an external object; and on the other hand, it is convenient for adding a soft structure between the seat cover and the foldable seat, thus improving comfort of the user.

Further, the seat cover is detachably connected with the foldable seat, a zipper is arranged on the seat cover, and the seat cover covers the foldable seat through an opening formed by the zipper.

In some examples, a seat pack and a backrest pack are arranged in the seat cover, the seat pack is arranged on the cushion unit 101, and the backrest pack is arranged on the backrest unit 201. In order to ensure position stability of the seat pack, the seat pack is connected to the cross beam 102.

In the descriptions of the specification, the descriptions with reference to the terms “one embodiment”, “some instances”, “some embodiments”, “illustrative embodiment”, “example”, “specific example” or “some examples”, etc., refer to that specific features, structures, materials, or characteristics described with reference to the embodiments or examples are included in at least one embodiment or example of the disclosure. In the specification, the schematic representation of the above terms does not necessarily mean 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.

The embodiments of the disclosure are described in detail with reference to the drawings above, but the disclosure is not limited to the above embodiments, and various changes may also be made within the knowledge scope of those of ordinary skills in the art without departing from the purpose of the disclosure.

Claims

1. A foldable seat, comprising:

a cushion unit, wherein the cushion unit is horizontally arranged, and the cushion unit is configured for supporting buttocks of a user;
a backrest unit, wherein the backrest unit comprises at least two connecting rods connected with the cushion unit, and each of the connecting rods comprises a first rotating rod and a second rotating rod; and
a gear adjustment unit through which the first rotating rod and the second rotating rod are connected, wherein the gear adjustment unit comprises a plurality of gear teeth, a turntable and a clamping structure, a first end of the first rotating rod is connected with the cushion unit, a second end of the first rotating rod is provided with a first hinge shaft, an end portion of the second rotating rod is arranged on the first hinge shaft, the gear teeth are arranged at the end portion of the second rotating rod and distributed in an arc shape, the clamping structure is rotatably connected to the first rotating rod, a clamping groove is arranged on the clamping structure, the clamping groove is configured to be engaged with the gear teeth, the turntable is arranged on the first hinge shaft, and the turntable is capable of pushing the clamping structure, so that the clamping structure is connected with or separated from the gear teeth.

2. The foldable seat according to claim 1, wherein the turntable comprises a first abutting portion, a second abutting portion and a concave portion, a distance between the first abutting portion and the first hinge shaft is not less than a distance between a crest of the gear teeth and the first hinge shaft, a distance between the second abutting portion and the first hinge shaft is not greater than a distance between a root of the gear teeth and the first hinge shaft, the concave portion is arranged between the first abutting portion and the second abutting portion, a stop rod is arranged on the second rotating rod, and the stop rod is located in a range of the concave portion.

3. The foldable seat according to claim 2, wherein the second end of the first rotating rod is hollow, and the clamping structure, the turntable and the end portion of the second rotating rod are all arranged inside the second end of the first rotating rod.

4. The foldable seat according to claim 1, wherein a second hinge shaft is arranged on the first rotating rod, the clamping structure is arranged on the second hinge shaft, a torsion spring is arranged on the second hinge shaft, and the torsion spring is connected with the clamping structure.

5. The foldable seat according to claim 1, wherein the foldable seat further comprises an armrest unit, the armrest unit comprises a third rotating rod and a fourth rotating rod, a first end of the third rotating rod is connected with the cushion unit, a second end of the third rotating rod is hinged with the fourth rotating rod, and the fourth rotating rod is capable of rotating towards the cushion unit.

6. The foldable seat according to claim 1, wherein the connecting rod forms an angle with the cushion unit.

7. The foldable seat according to claim 6, wherein a plurality of positioning rods are arranged on the cushion unit, and each of the positioning rods are connected with a respective one of first rotating rods.

8. The foldable seat according to claim 1, wherein a middle portion of the cushion unit is provided with a cross beam.

9. The foldable seat according to claim 1, wherein the foldable seat further comprises a seat cover, the seat cover is detachably connected with the foldable seat, the seat cover covers a surface of the foldable seat, and a zipper is arranged on the seat cover.

10. The foldable seat according to claim 9, wherein a seat pack and a backrest pack are arranged in the seat cover, the seat pack is arranged on the cushion unit, and the backrest pack is arranged on the backrest unit.

Patent History
Publication number: 20240156264
Type: Application
Filed: Feb 27, 2023
Publication Date: May 16, 2024
Applicant: Shenzhen Yuandaoyuan Industry Co., Ltd. (Shenzhen)
Inventor: Hui JIN (Guangzhou City)
Application Number: 18/175,054
Classifications
International Classification: A47C 4/28 (20060101); A47C 7/54 (20060101);