Folding seat with adjustable waist rest

Abstract

The utility model discloses a folding seat with an adjustable waist rest, which comprises two landing support frames (1), a seat plate (2) arranged between the two support frames (1), the rear side of the seat plate (2) rotatably connected with the support frames (1), a torsion spring (3) arranged between the seat plate (2) and the support frames (1), a backup plate (4) arranged on the rear side of the seat plate (2), a waist rest (5) arranged above the seat plate (2) and close to the backup plate (4), and a lifting plate (6) slidably connected with the backup plate (4). Lifting plates (6) connected with the waist rest (5) are arranged on the two sides of the backup plate (4), connecting rods (7) are arranged between the lifting plates (6) and the seat plate (2), one ends of the connecting rods (7) are rotationally connected with the lifting plates (6), and the other ends of the connecting rods (7) are rotationally connected with one side of the seat plate (2). The chair has the advantages that the height of the waist rest can be automatically adjusted according to the state of the seat plate, the chair is comfortable to use when a person sits on the chair, and the folding effect is good when no person sits on the chair.

Description

Technical Field

[0001] This utility model belongs to the field of folding seats, and in particular relates to a folding seat with adjustable lumbar support. Background Technology

[0002] Folding chairs are commonly used in public places such as conference halls. Multiple folding chairs are arranged in a rectangular array. When attendees stand up, the seat of the folding chair will rotate to fit against the backrest. The purpose of this setting is to create a wider passage between the front and back rows when leaving, which facilitates the passage of people and also makes it easier to clean up after the meeting.

[0003] The existing folding chair structure includes two floor-mounted support frames on the left and right, with a seat plate between the two support frames. The rear side of the seat plate is rotatably connected to the support frames, and a torsion spring is installed between the seat plate and the support frames. A backrest plate, fixed to the support frames, is located on the rear side of the seat plate. Under the action of the torsion spring, when the folding chair is not in use, the seat plate flips upward and folds up, keeping it flush with the backrest plate. When folding chairs are installed in a conference hall, the support frames of adjacent folding chairs in the same row can be shared.

[0004] In some high-end conference halls, padded lumbar supports are installed on the front side of the backrest. However, after the lumbar supports are installed, an obstacle is formed between the seat and the backrest, preventing the seat from fitting snugly against the backrest. When the seat is folded, the upper part remains tilted forward, reducing the width of the aisle and hindering the passage of people and post-meeting cleaning. The folding effect is also poor. Utility Model Content

[0005] The purpose of this invention is to provide a folding chair with adjustable lumbar support. This invention has the advantage that the lumbar support height can automatically adjust according to the seat position, making it comfortable to use when someone is sitting on it, and also providing good folding performance when no one is sitting on it.

[0006] The technical solution of this utility model is as follows: A folding chair with adjustable lumbar support includes two floor-mounted support frames, a seat plate between the two support frames, a rear side of the seat plate being rotatably connected to the support frame, a torsion spring between the seat plate and the support frame, a backrest plate fixed to the support frame on the rear side of the seat plate, a lumbar support plate near the backrest plate above the seat plate, lifting plates connected to the lumbar support plate on both sides of the backrest plate, the lifting plates being slidably connected to the backrest plate, a connecting rod between the lifting plates and the seat plate, one end of the connecting rod being rotatably connected to the lifting plate, and the other end of the connecting rod being rotatably connected to one side of the seat plate.

[0007] The aforementioned adjustable folding seat with lumbar support is centered, and the support frame includes a column fixed to the rear side of the backrest, a base plate at the bottom of the column, mounting holes on the base plate, and a cantilever beam rotatably connected to the seat plate on the front side of the column.

[0008] The aforementioned adjustable folding seat with lumbar support is centered, and a pivot is provided on one side of the seat plate. A through hole that mates with the pivot is provided on the cantilever beam. The torsion spring is helical, and the pivot passes through the torsion spring. One end of the torsion spring is connected to the seat plate, and the other end of the torsion spring is connected to the cantilever beam.

[0009] The aforementioned adjustable folding seat with lumbar support is centered. The connecting rod includes a vertical part and a horizontal part. The vertical part is connected to the horizontal part through a curved part. One end of the vertical part is rotatably connected to the lifting plate, and one end of the horizontal part is rotatably connected to the seat plate.

[0010] The aforementioned adjustable folding seat is centered, and the lumbar support includes a flexible inner core with a fabric cover on the outside of the inner core, which is connected to the lifting plate by hook and loop fastener.

[0011] Compared with existing technologies, this utility model features a lifting plate that slides on the lumbar support and is connected to the backrest. A connecting rod is installed between the lifting plate and the seat, enabling the lumbar support to move in tandem with the seat. When someone is on the seat and it remains horizontal, the lumbar support is close to the seat, corresponding to the human waist, providing better support and comfort. When someone leaves the seat or the seat rotates upward, the lumbar support automatically rises, preventing it from being trapped between the seat and backrest, allowing the seat to stand upright without tilting forward. This ensures a wide passageway in front of the seat, facilitating passage and post-meeting cleaning, and also provides good folding efficiency. Therefore, this utility model has the advantage of automatically adjusting the lumbar support height according to the seat position, providing comfort when someone is sitting and good folding efficiency when no one is sitting. Attached Figure Description

[0012] Figure 1 This is a left-side view of the utility model in use.

[0013] Figure 2 This is a left-side view of the present invention in its idle state.

[0014] Figure 3 This is a top view of the utility model in use.

[0015] Figure 4 This is a top-down view of multiple folding seats used side by side.

[0016] The labels in the attached diagram are: 1-support frame, 2-seat plate, 3-torsion spring, 4-backrest plate, 5-lumbar support, 6-lifting plate, 7-connecting rod, 8-column, 9-base plate, 10-mounting hole, 11-cantilever beam, 12-rotating shaft, 13-through hole, 14-vertical part, 15-horizontal part, 16-bent part. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0018] Example: A folding chair with adjustable lumbar support, such as Figures 1 to 3 As shown, it includes two ground-mounted support frames 1. Each support frame 1 includes a column 8. The bottom of the column 8 is provided with a base plate 9. The base plate 9 is provided with mounting holes 10. The base plate 9 is fixed to the ground by expansion bolts passing through the mounting holes 10. The front side of the column 8 is provided with a cantilever beam 11. The cantilever beam 11 is provided with a horizontal through hole 13.

[0019] A seat plate 2 is provided between the two support frames 1. The side walls of the seat plate 2 on both sides are provided with rotating shafts 12 that are inserted into corresponding through holes 13. A bearing is preferably provided between the rotating shaft 12 and the seat plate 2. The rotating shaft 12 is located at the rear of the seat plate 2. A spiral torsion spring 3 is sleeved on the rotating shaft 12. One end of the torsion spring 3 is connected to the seat plate 2, and the other end of the torsion spring 3 is connected to the cantilever beam 11.

[0020] The rear side of the seat plate 2 is provided with a backrest plate 4 that is screwed to the upright 8, and the bottom surface of the backrest plate 4 is in contact with the top surface of the base. The front side of the backrest plate 4 is provided with a lumbar support 5 near the seat plate 2. The lumbar support 5 includes a foam core, and the outside of the core is covered with a cloth cover. The cloth cover has a zipper opening sewn on it, so that the core can be removed from the cloth cover for easy cleaning when the cloth cover gets dirty.

[0021] Both sides of the backrest 4 are equipped with lifting plates 6 that connect to the lumbar support 5. The lifting plates 6 are Z-shaped when viewed from above. The fabric cover of the lumbar support 5 is connected to the front end of the lifting plate 6 with a hook and loop fastener, and the rear end of the lifting plate 6 is slidably connected to the seat plate 2. For the connection between the lifting plate 6 and the seat plate 2, a groove can be cut into the side wall of the seat plate and a slide rail can be built in. A slider fixed to the lifting plate 6 can be set on the slide rail.

[0022] A connecting rod 7 is provided between the lifting plate 6 and the seat plate 2. The connecting rod 7 includes a vertical part 14 and a horizontal part 15. The vertical part 14 is connected to the horizontal part 15 through a bending part 16. One end of the vertical part 14 is rotatably connected to the lifting plate 6, and one end of the horizontal part 15 is rotatably connected to the seat plate 2.

[0023] As a preferred option, a damped rotating handrail can also be installed on the column 8.

[0024] Working principle: such as Figure 1 The diagram shows a seat with someone sitting on it. At this time, the weight of the person presses down on the seat plate 2, and the rear end of the seat plate 2 is limited by the backrest 4, keeping the seat plate 2 horizontal. When the person leaves the seat, as... Figure 2 As shown, under the action of the torsion spring 3, the front end of the seat plate 2 flips upward until the seat plate 2 is flush with the backrest 4, leaving a large passage on the front side of the seat. During the flipping process of the seat plate 2, the connecting rod pushes the lifting plate 6 to rise, thereby raising the lumbar support 5. Finally, when the seat plate 2 is flush with the backrest 4, the lumbar support 5 is positioned above the seat plate 2, keeping the seat plate 2 in a vertical position. Figure 1As can be seen, the L-shaped linkage 7 prevents a person from touching it when sitting on it, resulting in better usability. From Figure 2 As can be seen, the curved portion 16 prevents the connecting rod 7 from extending beyond the rear side of the column 8, thus preventing the connecting rod 7 from obstructing the movement of people behind the seat. Figure 4 As shown, when multiple folding seats are used side by side, the support frames of adjacent seats can be shared, reducing costs.

[0025] Because the lumbar support 5 is connected to the lifting plate 6 via Velcro, the lumbar support 5 can be removed and its cover taken out for cleaning. Furthermore, the height of the lumbar support 5 can be finely adjusted according to the user's height, further improving comfort.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A folding chair with adjustable lumbar support, comprising two floor-mounted support frames (1), a seat plate (2) between the two support frames (1), the rear side of the seat plate (2) being rotatably connected to the support frame (1), a torsion spring (3) between the seat plate (2) and the support frame (1), a backrest plate (4) fixed to the support frame (1) on the rear side of the seat plate (2), and a lumbar support (5) near the backrest plate (4) above the seat plate (2), characterized in that: Both sides of the backrest (4) are provided with lifting plates (6) that connect to the lumbar support (5). The lifting plates (6) are slidably connected to the backrest (4). A connecting rod (7) is provided between the lifting plates (6) and the seat plate (2). One end of the connecting rod (7) is rotatably connected to the lifting plates (6), and the other end of the connecting rod (7) is rotatably connected to one side of the seat plate (2).

2. The adjustable lumbar support folding chair according to claim 1, characterized in that: The support frame (1) includes a column (8) fixed to the rear side of the back plate (4), a base plate (9) at the bottom of the column (8), an installation hole (10) on the base plate (9), and a cantilever beam (11) rotatably connected to the seat plate (2) on the front side of the column (8).

3. The adjustable lumbar support folding chair according to claim 2, characterized in that: The seat plate (2) has a rotating shaft (12) on one side, and the cantilever beam (11) has a through hole (13) that cooperates with the rotating shaft (12); the torsion spring (3) is helical, the rotating shaft (12) passes through the torsion spring (3), one end of the torsion spring (3) is connected to the seat plate (2), and the other end of the torsion spring (3) is connected to the cantilever beam (11).

4. The adjustable lumbar support folding chair according to claim 1, characterized in that: The connecting rod (7) includes a vertical part (14) and a horizontal part (15). The vertical part (14) is connected to the horizontal part (15) through a curved part (16). One end of the vertical part (14) is rotatably connected to the lifting plate (6), and one end of the horizontal part (15) is rotatably connected to the seat plate (2).

5. The adjustable lumbar support folding chair according to claim 1, characterized in that: The lumbar support (5) includes a flexible inner core, and a cloth cover is provided on the outside of the inner core. The cloth cover is fastened to the lifting plate (6).

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