Linkage folding seat with slow return function

Abstract

The utility model discloses a linkage folding chair with a slow return function. The linkage folding chair comprises at least two chair legs, a chair seat and a chair back, wherein the chair seat and the chair back are arranged between the two chair legs; the linkage assembly comprises a first corner connector, a second corner connector and a connecting rod; the damper is fixedly connected with the seat frame, and the transverse pipe penetrates through the damper to be arranged; the two ends of the pneumatic damping piece are connected with the seat frame and the transverse pipe respectively. Linkage rotation of the chair seat and the chair back is achieved through linkage assemblies such as the first corner connectors, the second corner connectors and the connecting rods, and switching of the chair between the unfolding state and the folding state is completed. When the seat is folded to return, the seat body and the seat back are turned over under the action force of self weight and the action force of the torsion spring, in the turning process, the damper is used for providing uniform resistance, and the resistance provided by the pneumatic damping piece is increased from small to large.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a linkage folding seat with a slow return function. Background Art

[0002] At present, public seats widely used in theaters, auditoriums, concert halls, lecture theaters, cinemas or similar places have a flip-fold function. The seat board is mainly rotatably connected to the seat frame. When in use, the seat board is put down. When not in use, the user stands up, and the seat board automatically flips and folds against the backrest, thereby expanding the passage to facilitate the evacuation of the audience.

[0003] The reset folding of the seat board generally realizes the automatic flipping effect through designs such as adding a counterweight structure or a leaf spring structure. For example, the Chinese patent with the publication number CN221204526U discloses a row chair for a lecture theater, which automatically squeezes and flips the rotatable seat board upward by using the self-weight of a metal counterweight block to complete the folding work of the rotatable seat board. The Chinese patent with the publication number CN207084560U discloses a bus stop seat that can automatically flip and reset, and a counterweight block for the seat surface to automatically flip to the vertical is arranged on the seat surface to realize the automatic storage of the seat surface. The common defect of such a structural design method is that when the seat board with a counterweight structure is reset and flipped, it is easy to make an obvious impact sound when the seat board stops against the backrest or other limiting structures due to too fast rotation speed, which affects the auditory effect of the user and is easy to cause the seat to be damaged by collision. In addition, during long-term use, the frequent rapid rotation of the seat board is likely to cause the use effect of the spring structure to decline, and even affect its service life.

[0004] Therefore, there is an urgent need in the prior art to invent a seat that can achieve flipping and returning without relying on a counterweight structure and has a slow return function. Summary of the Utility Model

[0005] In order to overcome the technical problems such as too fast speed during the flipping and reset of the seat board in the above-mentioned prior art, which may cause noise or easily lead to seat damage, the utility model provides a linkage folding seat with a slow return function.

[0006] The technical solution adopted by the utility model to solve its problems is as follows:

[0007] There is provided a linkage folding seat with a slow return function, which includes:

[0008] At least two chair legs and a seat and a backrest disposed between the two chair legs. The seat includes a seat frame, the backrest includes a backboard, a cross tube is fixedly arranged between the two chair legs, and the seat frame and the cross tube are rotatably connected;

[0009] Linkage assembly, the linkage assembly includes a first corner fitting, a second corner fitting and a connecting rod. The first corner fitting and the second corner fitting are respectively fixed on the seat frame and the backrest. One end of the connecting rod is hinged to the chair leg, one end of the second corner fitting is hinged to the first corner fitting, and the other end is hinged to the other end of the connecting rod;

[0010] Damper and pneumatic damper component. The damper is fixedly connected to the seat frame, and the cross tube passes through the damper; both ends of the pneumatic damper component are respectively connected to the seat frame and the cross tube.

[0011] In a preferred embodiment of the present utility model, a technical solution for the specific structural design of the pneumatic damper component, the damper and two corner fittings is provided.

[0012] A connecting portion is provided inside the seat frame. The pneumatic damper component includes a damping air rod and a damping connecting piece. One end of the damping air rod is connected to the connecting portion, and the other end is hinged to the cross tube through the damping connecting piece.

[0013] The linkage folding seat with a slow return function further includes a limit sleeve, which is fixedly installed on the cross tube, and its end abuts against the damper.

[0014] Both the first corner fitting and the second corner fitting are L-shaped structures.

[0015] In another preferred embodiment of the present utility model, a technical solution for the specific structural design of the return buffer member is provided.

[0016] The linkage folding seat with a slow return function further includes a return buffer member. The return buffer member includes a torsion spring sleeved on the cross tube and a return spring adjustment seat. One end of the torsion spring is connected to the return spring adjustment seat, and the other end abuts against the inner side of the seat frame.

[0017] A plurality of adjustment holes are arranged at intervals along the circumferential direction on the side of the return spring adjustment seat facing the torsion spring. One end of the torsion spring is inserted into the adjustment hole.

[0018] The return buffer member further includes a sound insulation sleeve, which is arranged between the cross tube and the torsion spring.

[0019] In another preferred embodiment of the present utility model, a specific structural design solution for the linkage folding seat in the opened state and the folded state is provided.

[0020] A hanging code is fixedly provided on the side of the chair leg facing the seat. Both ends of the cross tube are fixedly arranged on the hanging code. The hanging code includes a limiting portion. A limiting protrusion is provided on the side of the first corner fitting facing the chair leg. The limiting portion is used to block the limiting protrusion, thereby limiting the rotation angle of the seat.

[0021] The number of the limiting parts is two. When the limiting protrusion abuts against the two limiting parts, the linkage folding seat is in the opened state and the folded state respectively.

[0022] When the linkage folding seat is in the opened state, the seat and the backrest are unfolded, facilitating the user to sit down and lean on. When the linkage folding seat is in the folded state, the two chair legs are arranged in parallel with each other, and the seat and the backrest are arranged in parallel with each other.

[0023] In summary, compared with the prior art, the linkage folding seat with a slow return function provided by the present invention has at least the following technical effects:

[0024] 1) In the linkage folding seat of the present invention, the seat frame of the seat is rotatably installed between the two chair legs through a cross tube, and the back plate of the backrest is respectively hinged to the connecting rod hinged on the chair leg and the first corner code of the seat through a second corner code. Through the above components, the seat and the backrest are linked to rotate, completing the switching between the opened state and the folded state of the seat without using a counterweight structure. When the seat is opened, the seat and the backrest are simultaneously unfolded for easy use; when the seat is folded, the chair legs of the seat are parallel to each other, and the seat and the backrest are parallel to each other, forming a square and regular overall structure, reducing the space occupation.

[0025] 2) When the linkage folding seat of the present invention is folded and returned, the seat and the backrest are flipped under the action of their own gravity and the torsion spring. During the flipping process, the damper is used to provide a uniform resistance, and the resistance provided by the pneumatic damping member increases from small to large. Therefore, the seat has a fast speed at the initial stage of flipping, and when flipping to about half of the stroke, the flipping speed of the seat and the backrest can be slowed down under the buffering action of the pneumatic damping member, avoiding damage or collision noise caused by too fast rotation speed of the seat and the backrest, thereby realizing the slow and silent return function. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is an exploded view of the linkage folding seat with a slow return function of the present invention;

[0027] Figure 2 is a schematic structural view of the linkage folding seat with a slow return function of the present invention in the opened state;

[0028] Figure 3 is a schematic structural view of the linkage folding seat with a slow return function of the present invention in the opened state and excluding the seat cushion and the back cushion;

[0029] Figure 4 is a top view of the linkage folding seat with a slow return function of the present invention in the opened state and excluding the seat cushion and the back cushion;

[0030] Figure 5 The structural schematic diagram of the linkage folding seat with a slow return function of the present utility model in the folded state;

[0031] Among them, the meanings of the reference numerals are as follows:

[0032] 1. Chair leg; 11. Link; 12. Hanging code; 121. Limiting part; 13. Connecting pipe; 2. Seat; 21. Seat frame; 22. Connecting part; 3. Backrest; 31. Back panel; 4. First corner code; 41. Limiting protrusion; 5. Second corner code; 6. Horizontal pipe; 61. Horizontal pipe sleeve; 7. Damper; 71. Limiting sleeve; 8. Pneumatic damper; 81. Damper air rod; 82. Damper connecting piece; 9. Return buffer; 91. Torsion spring; 92. Rebound adjusting sleeve; 93. Sound-absorbing sleeve. Detailed implementation manners

[0033] For better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0034] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0036] See Figures 1 - 5 As shown, the linkage folding seat with a slow return function of the present utility model includes at least two chair legs 1, a seat 2 rotatably arranged between the two chair legs 1, and a backrest 3. The seat 2 includes a seat frame 21 and a seat cushion, and the seat cushion is sleeved outside the seat frame 21. The backrest 3 includes a back panel 31 and a back cushion, and the back cushion is sleeved outside the back panel 31. A horizontal pipe 6 is fixedly arranged between the two chair legs 1, and the seat frame 21 and the horizontal pipe 6 are rotatably connected. The linkage folding seat of the present utility model includes an open state and a folded state. In the open state, the seat 2 and the backrest 3 are simultaneously unfolded for use; in the folded state, the two chair legs 1 are parallel to each other, the seat 2 and the backrest 3 are parallel to each other, and the whole forms a square structure, reducing space occupation.

[0037] SeeFigure 1 and Figure 3 As shown in Figure 3 , the linkage folding seat with a slow return function further includes a linkage assembly. The linkage assembly includes a first corner fitting 4, a second corner fitting 5, and a connecting rod 11. The first corner fitting 4 is fixedly arranged on the seat frame 21, the second corner fitting 5 is fixedly arranged on the backrest plate 31, one end of the connecting rod 11 is hinged to the chair leg 1, one end of the second corner fitting 5 is hinged to the first corner fitting 4, and the other end of the second corner fitting 5 is hinged to the other end of the connecting rod 11. The above-mentioned linkage assembly is used to realize the linkage rotation of the seat 2 and the backrest 3, complete the switching between the open state and the folded state of the linkage folding seat, and there is no need to use a counterweight structure.

[0038] See Figure 1 and Figure 4 As shown in Figure 4 , the linkage folding seat with a slow return function further includes a damper 7. The damper 7 is fixedly installed inside the seat frame 21, and the cross tube 6 passes through the damper 7. Specifically, when the linkage folding seat folds back, the seat frame 21 flips upward, and the damper 7 is used to provide a uniform reverse resistance force for the seat frame 21.

[0039] See Figure 1 and Figure 4 As shown in Figure 4 , the linkage folding seat with a slow return function further includes a pneumatic damper 8. Both ends of the pneumatic damper 8 are respectively connected to the seat frame 21 and the cross tube 6. Specifically, when the seat frame 21 flips upward and resets, the piston inside the pneumatic damper 8 gradually compresses the air to achieve a damping effect. When the flipping angle of the seat frame 21 is larger, the compressed air volume is smaller, and the damping force on the seat frame 21 is larger, that is, the resistance provided by the pneumatic damper 8 increases from small to large. Preferably, the pneumatic damper 8 and the seat frame 21, the cross tube 6 can be connected by a hinged manner. The cross tube 6 is a non-circular tube (preferably an oval tube). When the seat frame 21 flips relative to the cross tube 6, the connection point distance at both ends of the pneumatic damper 8 changes within a small range, and the piston of the pneumatic damper 8 has a stroke and compresses the internal air, thereby generating a damping effect that increases from small to large.

[0040] Therefore, in the technical solution of the present invention, when the seat frame 21 flips upward and returns, the backrest plate 31 is driven to flip downward through the first corner fitting 4, the second corner fitting 5, and the connecting rod 11 to realize the linkage rotation function of the two. During the folding and returning process of the seat, the flipping starting stage speed of the seat frame 21 is relatively fast. When flipping to about half of the stroke, under the gradually increasing damping force of the pneumatic damper 8, the flipping speed of the seat frame 21 can be slowed down, avoiding the collision damage or collision noise caused by the excessive rotation speed of the seat 21 and the backrest 31, so as to realize the slow and silent return function.

[0041] Particularly, the seat frame 21 is preferably a hollow square frame structure, and the backrest plate 31 is preferably a square plate structure.

[0042] Optionally, the first corner code 4 can be fixedly installed on the seat frame 21 by riveting or screwing, etc., or can be integrally formed directly on the seat frame 21; the second corner code 5 can be fixedly installed on the back plate 31 by riveting or screwing, etc., or can be integrally formed directly on the back plate 31. The first corner code 4 and the second corner code 5, between the second corner code 5 and the connecting rod 11, and between the connecting rod 11 and the chair leg 1 can be hinged by means of bolt assemblies, etc.

[0043] Embodiment 1

[0044] In a preferred embodiment of the present utility model, a solution for the specific structural design of the pneumatic damping member 8, the damper 7, and two corner codes is provided.

[0045] See Figure 1 and Figure 4 As shown, a connecting portion 22 is provided inside the seat frame 21. The pneumatic damping member 8 includes a damping air rod 81 and a damping connecting member 82. One end of the damping air rod 81 is connected to the connecting portion 22, and the other end of the damping air rod 81 is hinged to the cross tube 6 through the damping connecting member 82. Among them, the connecting portion 22 is a rod structure extending from the inside of the seat frame 21 towards the cross tube 6, and is used to connect the pneumatic damping member 8, so that the seat frame 21 can be adapted to a small-sized damping air rod 82. The damping connecting member 82 is fixed on the cross tube 6 and will not rotate relative to the cross tube 6, and the damping air rod 82 and the damping connecting member 82 are hinged. Preferably, the damping connecting member 82 is provided with a hole (preferably an oval hole) adapted to the cross tube 6 for the cross tube 6 to pass through, so that the damping connecting member 82 will not rotate relative to the cross tube 6. Therefore, when the seat frame 21 is flipped relative to the cross tube 6, the distance between the connection point of the damping air rod 81 and the connecting portion 22 and the connection point of the damping air rod 81 and the damping connecting member 82 changes, and the piston of the damping air rod 81 travels and compresses the internal air, thereby generating a damping effect from small to large.

[0046] Optionally, the damping air rod 81 and the connecting portion 22 or the damping air rod 81 and the damping connecting member 82 can be hinged by means of bolt assemblies, etc.

[0047] See Figure 1 and Figure 4 As shown, the linkage folding seat with a slow return function further includes a limit sleeve 71. The limit sleeve 71 is fixedly installed on the cross tube 6, and the end of the limit sleeve 71 abuts against the damper 7, so as to realize the limit fixation of the damper 7 in the axial direction of the cross tube 6.

[0048] In the technical solution of this embodiment, the damper 7 can preferably adopt a mechanical damper. The damper 7 includes a base, a housing arranged on the base, a central gear arranged inside the housing and fixedly connected to the horizontal pipe 6, and a plurality of transmission gear structures meshing with the central gear. When the seat frame 21 rotates relative to the horizontal pipe 6, the central gear needs to drive the plurality of transmission gear structures to rotate, thereby slowing down the rotation speed of the central gear, that is, slowing down the flipping speed of the seat frame 21 relative to the horizontal pipe 6.

[0049] Alternatively, the damper 7 can preferably be a toothed ring damper sleeve structure. The damper 7 is provided with a toothed ring, and the horizontal pipe 6 is provided with a toothed sleeve. The toothed ring meshes with the toothed sleeve. In this way, when the seat frame 21 flips and resets, the toothed ring can mesh with the toothed sleeve to slow down the rotation speed of the seat frame 21.

[0050] It is worth mentioning that the damper 7 of the present utility model is not limited to the above two structural designs. As long as it can provide a uniform damping force when the seat frame 21 flips, the damping device is within the protection scope of the present utility model.

[0051] See Figure 1 and Figure 3 As shown, both the first corner code 4 and the second corner code 5 can be set as L-shaped structures. One end of the L-shaped structure of the first corner code 4 is fixedly connected to the seat frame 21, and the other end is hinged to the second corner code 4. One end of the L-shaped structure of the second corner code 5 is fixedly connected to the back plate 31 and hinged to the connecting rod 11, and the other end is hinged to the first corner code 4, so that the first corner code 4, the second corner code 5 and the connecting rod 11 achieve a linkage rotation effect, and there is no mutual interference between the linkage components, and at the same time, the material cost can be solved.

[0052] Embodiment 2

[0053] In another preferred embodiment of the present utility model, a solution for the specific structural design of the return buffer 9 is provided.

[0054] See Figure 1 and Figure 4As shown in the figure, the linkage folding seat with a slow return function further includes a return buffer member 9. The return buffer member 9 includes a torsion spring 91 sleeved on the cross tube 6 and a return spring adjustment seat 92. One end of the torsion spring 91 is connected to the return spring adjustment seat 92, and the other end of the torsion spring 91 abuts against the inner side of the seat frame 21. Specifically, the torsion spring 91 is used to provide an elastic force for the seat frame 21 to flip and reset upward, so as to prevent the seat frame 21 and the backrest 31 from being unable to flip and reset due to insufficient self-weight. Among them, the return spring adjustment seat 92 is fixedly installed on the cross tube 6. One end of the torsion spring 91 is preferably a straight torsion arm, which is inserted into the return spring adjustment seat 92 and connected to it. The other end of the torsion spring 91 is preferably a hook-shaped torsion arm. A convex structure is provided on the inner side of the seat frame 21, and the hook-shaped torsion arm is hooked on the convex structure and abuts against it. Through the above structural design method, after the force on the seat frame 21 is removed, the elastic stress for driving the seat frame 21 to flip and reset can be provided by the two torsion arms of the torsion spring 91

[0055] See Figure 1 As shown in the figure, a plurality of adjustment holes are arranged at intervals along the circumferential direction on the side of the return spring adjustment seat 92 facing the torsion spring 91, and one end of the torsion spring 91 is inserted into the adjustment holes. Specifically, the torsion spring 91 can be selectively inserted into different adjustment holes according to specific needs, so as to adjust the magnitude of the elastic stress of the torsion spring 91 on the seat frame 21. For example, when the weight of the seat frame 21 is large, the elastic stress of the torsion spring 91 on the seat frame 21 can be increased to prevent the seat 2 and the backrest 3 from being unable to flip and reset

[0056] See Figure 1 As shown in the figure, the return buffer member 9 further includes a sound insulation sleeve 93. The sound insulation sleeve 93 is sleeved on the outside of the cross tube 6 and passes through the torsion spring 91, that is, it is arranged between the cross tube 6 and the torsion spring 91. Preferably, the sound insulation sleeve 93 can be made of silica gel or rubber material. By providing the sound insulation sleeve 6, the friction between the torsion spring 91 and the cross tube 6 can be greatly reduced, thereby reducing noise generation

[0057] Embodiment 3

[0058] In another preferred embodiment of the present invention, a solution for the specific structural design of the linkage folding seat in the opened state and the folded state is provided

[0059] See Figure 1As shown, on one side of the chair leg 1 facing the seat 2, a hanging code 12 is fixedly provided. Both ends of the horizontal tube 6 are fixedly installed on the hanging code 12. The hanging code 12 includes a limiting part 121. On one side of the first angle code 4 facing the chair leg, a limiting protrusion 41 is provided. The limiting part 121 is used to block the limiting protrusion 41, thereby restricting the rotation angle or flipping angle of the seat 2. Specifically, when the seat frame 21 flips relative to the horizontal tube 6, it drives the first angle code 4 on the seat frame 21 to rotate synchronously. When the limiting protrusion 41 on the first angle code 4 abuts against the limiting part 121 on the hanging code 12, the seat frame 21 cannot continue to flip, thereby restricting the flipping angle of the seat frame 21 and preventing the seat 2 from continuing to expand in the open state.

[0060] See Figure 1 As shown, the number of the limiting parts 121 is two. When the limiting protrusion 41 abuts against the two limiting parts 121, the linkage folding seat of the present invention is in the open state and the folded state respectively. Specifically, the included angle between the two limiting parts 121 on the hanging code 12 can be adjusted according to actual situations, so as to adjust the rotatable angle between the seat 2 and the backrest 3, and further adjust the structural forms of the two in the open state and the folded state.

[0061] See Figure 2 As shown, when the linkage folding seat is in the open state, the seat 2 and the backrest 3 are unfolded, which is convenient for the user to sit down and lean on. See Figure 5 As shown, when the linkage folding seat is in the folded state, the two chair legs 1 are arranged in parallel, and the seat 2 and the backrest 3 are arranged in parallel, forming a square structure as a whole, reducing the space occupation.

[0062] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include the technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A linkage folding seat with a slow return function, characterized in that: include: At least two chair legs and a chair seat and a chair back disposed between the two chair legs, the chair seat comprising a seat frame, the chair back comprising a back plate, a transverse tube being fixedly disposed between the two chair legs, and the seat frame and the transverse tube being rotatably connected; A linkage assembly, the linkage assembly comprising a first angle bracket, a second angle bracket and a connecting rod, the first angle bracket and the second angle bracket are fixed to the seat frame and the back plate respectively, one end of the connecting rod is hinged to the chair leg, one end of the second angle bracket is hinged to the first angle bracket, and the other end is hinged to the other end of the connecting rod; The damper and the pneumatic damper are fixedly connected to the seat frame, and the transverse tube passes through the damper; the two ends of the pneumatic damper are respectively connected to the seat frame and the transverse tube.

2. The linkage folding seat with slow return function according to claim 1, characterized in that: A connecting portion is provided on the inner side of the seat frame, and the pneumatic damping member comprises a damping gas rod and a damping connecting member, one end of the damping gas rod is connected to the connecting portion, and the other end is hinged to the cross tube through the damping connecting member.

3. The linkage folding seat with slow return function according to claim 1, characterized in that: It also includes a limiting sleeve, which is fixedly mounted on the transverse tube, and an end of the limiting sleeve abuts against the damper.

4. The linkage folding seat with slow return function according to any one of claims 1 to 3, characterized in that: The first angle code and the second angle code are both L-shaped structures.

5. The linkage folding seat with slow return function according to claim 1, characterized in that: It also includes a return buffer, which includes a torsion spring and a rebound adjustment seat sleeved on the cross tube, one end of the torsion spring is connected to the rebound adjustment seat, and the other end abuts against the inner side of the seat frame.

6. The linkage folding seat with slow return function according to claim 5, characterized in that: A plurality of adjustment holes are arranged at intervals along the circumference of the rebound adjustment seat on one side facing the torsion spring, and one end of the torsion spring is inserted into the adjustment hole.

7. The linkage folding seat with slow return function according to claim 6, characterized in that: The return buffer also includes a silencer sleeve, which is arranged between the cross tube and the torsion spring.

8. The linkage folding seat with slow return function according to claim 1, characterized in that: A hanging code is fixedly provided on the side of the chair leg facing the seat, and both ends of the horizontal tube are fixed on the hanging code. The hanging code includes a limiting portion. A limiting protrusion is provided on the side of the first angle code facing the chair leg, and the limiting portion is used to block the limiting protrusion, thereby limiting the rotation angle of the seat.

9. The linkage folding seat with slow return function according to claim 8, characterized in that: The number of the limiting parts is two, and when the limiting protrusion abuts against the two limiting parts, the linked folding seat is respectively in an open state and a folded state.

10. The linkage folding seat with slow return function according to claim 9, characterized in that: In the folded state, the two chair legs are arranged parallel to each other, and the seat and the chair back are arranged parallel to each other.

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