Chair back and seat linkage structure

Abstract

The utility model discloses a chair back and chair seat linkage structure, relates to the technical field of furniture processing, and provides the following scheme aiming at the problems proposed in the background technology: the chair back and chair seat linkage structure comprises a seat plate, a clamping groove is formed in the upper surface of the seat plate, a rotating shaft is rotatably connected to the inner wall of the clamping groove, a backup plate is fixedly connected to the surface of the rotating shaft, and a cavity is formed in the seat plate; a locking assembly is slidably connected to the inner wall of the cavity, a strip-shaped groove is formed in the left side of the seat plate, and a linkage assembly is slidably connected to the inner wall of the strip-shaped groove. Through the arrangement of the linkage assembly, during use, the lead screw can be rotated to be unfolded from the inner threaded sleeve, meanwhile, the movable frame is rotated to be parallel to the locking frame, after the locking bolt is inserted into the locking threaded groove, the backup plate can be stably supported, and meanwhile, the backup plate is matched with the strip-shaped plate and the auxiliary supporting legs; the stable effect of a user lying on the backup plate and the seat plate is greatly improved, the problem of toppling is avoided, and the safety is higher.

Description

Technical Field

[0001] This utility model relates to the field of furniture processing technology, and in particular to a linkage structure between chair back and seat. Background Technology

[0002] Chairs are one of the most common pieces of furniture, often used in conjunction with tables, but can also be used alone as seating. Common chairs have a structure including legs, a seat, and a backrest. With the rapid development of modern society, the functions of chairs have become more and more diversified. For example, the backrest can be adjusted to a backward angle, making it convenient for users to recline or lie flat on the backrest.

[0003] Most existing adjustable seats use a pivot and torsion spring to link the backrest and seat. When the user leans against the backrest, the torsion spring on the pivot deforms, causing the backrest to adjust its angle backward. However, this linkage method lacks any auxiliary structure. Because adjusting the backrest backward shifts the user's center of gravity backward, a sudden, large movement can easily cause the user to tip backward due to instability. This results in poor stability and low safety, indicating room for improvement. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a chair back and seat linkage structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A chair back and seat linkage structure includes a seat plate, main support legs fixedly connected to the four corners of the lower surface of the seat plate, a slot formed on the upper surface of the seat plate, a rotating shaft rotatably connected to the inner wall of the slot, a backrest plate fixedly connected to the surface of the rotating shaft, a rectangular groove formed at the front end of the rotating shaft, an armrest fixedly connected to the upper surface of the seat plate, a cavity formed inside the seat plate, a locking component slidably connected to the inner wall of the cavity, a strip groove formed on the left side of the seat plate, a linkage component slidably connected to the inner wall of the strip groove, the locking component including a movable plate, a pull rod fixedly connected to the front of the movable plate, a spring sleeved on the surface of the pull rod, and a rectangular rod fixedly connected to the back of the movable plate.

[0007] The linkage component includes a strip plate, with two auxiliary support legs fixedly connected to the lower surface of the strip plate. A fixing groove is formed on the upper surface of the strip plate, and an internally threaded sleeve is rotatably connected to the inner wall of the fixing groove. A lead screw is threadedly connected to the inner wall of the internally threaded sleeve, and a movable frame is rotatably connected to the right end of the lead screw. A locking bolt is threadedly connected to the inner wall of the movable frame. A locking frame is fixedly connected to the left side of the back plate, and a locking threaded groove is formed on the left side of the locking frame. A strip frame is fixedly connected to the front of the seat plate, and a threaded rod is rotatably connected to the right side of the strip frame. A slider is slidably connected to the inner wall of the strip frame.

[0008] Preferably, the front of the seat plate has a circular hole that matches the pull rod. One end of the spring overlaps with the front of the movable plate, and the other end overlaps with the inner wall of the cavity. When the pull rod is pulled forward, it can cause the movable plate to compress the spring and deform it.

[0009] Preferably, the rear end of the rectangular rod extends into the interior of the slot, and the rectangular rod is adapted to the rectangular slot. The rectangular rod can be inserted into the rectangular slot to lock the rotating shaft. After the rectangular rod is disengaged from the rectangular slot, the angle of the backing plate can be adjusted by the rotating shaft.

[0010] Preferably, the position of the movable frame corresponds to the position of the locking frame, and the locking bolt is adapted to the locking thread groove. The internal thread sleeve can rotate, and the movable frame can rotate on the surface of the lead screw, thereby rotating to the same position as the locking frame.

[0011] Preferably, the left end of the threaded rod is rotatably connected to the inner wall of the strip frame, and the slider is threadedly connected to the threaded rod. Rotating the threaded rod can drive the slider to move left and right within the strip frame.

[0012] Preferably, the back of the slider extends into the interior of the strip groove and is fixedly connected to the front of the strip plate. When the slider moves within the strip frame, it can drive the strip plate to move within the strip groove.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. Through the setting of the linkage component, when in use, the screw can be rotated to unfold it from the internal threaded sleeve, and the movable frame can be rotated to make it parallel to the locking frame. After the locking bolt is inserted into the locking thread groove, it can provide stable support for the backrest. At the same time, in conjunction with the strip plate and auxiliary support legs, it greatly increases the stability of the user lying on the backrest and seat, and will not cause the problem of tipping over, making it safer.

[0015] 2. By setting the locking component, when the backrest does not need to be adjusted, the rectangular rod can be pressed into the rectangular groove at the front end of the rotating shaft by the force of the spring itself through the movable plate, thereby ensuring the stability of the user leaning against the backrest. When linked, pulling the lever forward will make the rotating shaft unrestricted, which is highly flexible. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a chair back and seat linkage structure proposed in this utility model.

[0017] Figure 2 This is a top-section diagram of the seat plate structure of the chair back and seat linkage structure proposed in this utility model;

[0018] Figure 3This is a front sectional view of a chair back and seat linkage structure proposed in this utility model;

[0019] Figure 4 This is a schematic diagram of the linkage structure of the chair back and seat linkage structure proposed in this utility model after linkage.

[0020] In the diagram: 1. Seat plate; 2. Main support leg; 3. Rotating shaft; 4. Backrest; 5. Armrest; 6. Movable plate; 7. Pull rod; 8. Spring; 9. Rectangular rod; 10. Strip plate; 11. Auxiliary support leg; 12. Internal threaded sleeve; 13. Lead screw; 14. Movable frame; 15. Locking bolt; 16. Locking frame; 17. Strip frame; 18. Threaded rod; 19. Slider. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1, referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 A chair back and seat linkage structure includes a seat plate 1, main support legs 2 fixedly connected to the four corners of the lower surface of the seat plate 1, a slot is formed on the upper surface of the seat plate 1, a rotating shaft 3 is rotatably connected to the inner wall of the slot, a backrest plate 4 is fixedly connected to the surface of the rotating shaft 3, a rectangular groove is formed at the front end of the rotating shaft 3, an armrest 5 is fixedly connected to the upper surface of the seat plate 1, a cavity is formed inside the seat plate 1, a locking component is slidably connected to the inner wall of the cavity, a strip groove is formed on the left side of the seat plate 1, and a linkage component is slidably connected to the inner wall of the strip groove.

[0023] The locking assembly includes a movable plate 6, a pull rod 7 fixedly connected to the front of the movable plate 6, a spring 8 sleeved on the surface of the pull rod 7, a circular hole adapted to the pull rod 7 on the front of the seat plate 1, one end of the spring 8 overlapping the front of the movable plate 6, and the other end overlapping the inner wall of the cavity, and a rectangular rod 9 fixedly connected to the back of the movable plate 6, the rear end of the rectangular rod 9 extending into the inside of the slot, and the rectangular rod 9 being adapted to the rectangular slot.

[0024] During normal use, the spring 8 can use its own force to press the rectangular rod 9 into the rectangular groove at the front end of the rotating shaft 3 through the movable plate 6, thereby locking the rotating shaft 3 and the backing plate 4. When it is necessary to adjust the angle of the backing plate 4, pull the lever 7 forward, which will drive the movable plate 6 forward. While squeezing the spring 8, it will drive the rectangular rod 9 out of the rectangular groove, thereby freeing the rotating shaft 3 from restriction and making it convenient to adjust the angle of the backing plate 4. It has a high degree of flexibility.

[0025] The linkage component includes a strip plate 10. Two auxiliary support legs 11 are fixedly connected to the lower surface of the strip plate 10. A fixing groove is opened on the upper surface of the strip plate 10. An internal threaded sleeve 12 is rotatably connected to the inner wall of the fixing groove. A lead screw 13 is threadedly connected to the inner wall of the internal threaded sleeve 12. A movable frame 14 is rotatably connected to the right end of the lead screw 13. A locking bolt 15 is threadedly connected to the inner wall of the movable frame 14. A locking frame 16 is fixedly connected to the left side of the back plate 4. The position of the movable frame 14 corresponds to the position of the locking frame 16. A locking thread groove is opened on the left side of the locking frame 16, and the locking bolt 15 is adapted to the locking thread groove.

[0026] A strip frame 17 is fixedly connected to the front of the seat plate 1. A threaded rod 18 is rotatably connected to the right side of the strip frame 17. The left end of the threaded rod 18 is rotatably connected to the inner wall of the strip frame 17. A slider 19 is slidably connected to the inner wall of the strip frame 17, and the slider 19 is threadedly connected to the threaded rod 18. The back of the slider 19 extends into the interior of the strip groove and is fixedly connected to the front of the strip plate 10.

[0027] Rotating the threaded rod 18 causes the slider 19 to move to the left within the strip frame 17. The slider 19 then causes the strip plate 10 to move to the left within the strip groove, thus unfolding the strip plate 10. After unfolding, rotating the internal threaded sleeve 12 causes it to extend out of the fixed groove. At this time, rotating the lead screw 13 causes the movable frame 14 to unfold. When the movable frame 14 unfolds to the position of the locking frame 16, rotating the movable frame 14 makes it parallel to the locking frame 16. The locking bolt 15 is then inserted into the locking thread groove to lock the movable frame 14 and the locking frame 16. At this time, the internal threaded sleeve 12, lead screw 13, movable frame 14, and locking frame 16 can provide stable support for the back plate 4. In conjunction with the strip plate 10 and the auxiliary support leg 11, it can ensure that the user will not experience tipping during use, resulting in better stability.

[0028] Working principle: Under normal use, spring 8 can press the movable plate 6 into the cavity through its own force, thus pressing the rectangular rod 9 into the rectangular groove at the front end of the rotating shaft 3, thereby locking the rotating shaft 3 and the backing plate 4. When the user needs to adjust the backing plate 4, pull the lever 7 forward, causing the lever 7 to drive the movable plate 6 to squeeze the spring 8, and at the same time drive the rectangular rod 9 out of the rectangular groove. At this time, the rotating shaft 3 is unrestricted, and the backing plate 4 can rotate. When the backing plate 4 rotates to the required angle, rotate the threaded rod 18, causing the threaded rod 18 to drive the slider 19 to the left within the strip frame 17. Move the slider 19 to unfold the strip plate 10. After unfolding, take out the internal threaded sleeve 12 and rotate the screw 13 to unfold the movable frame 14 to the position of the locking frame 16. Rotate the movable frame 14 to make it parallel to the locking frame 16. After inserting the locking bolt 15 into the locking thread groove, the internal threaded sleeve 12, screw 13, movable frame 14 and locking frame 16 can support the back plate 4, thereby improving the overall stability of the seat plate 1 when the back plate 4 is in use. The two auxiliary support legs 11 can also provide a certain support force to ensure the stability effect after linkage and prevent tipping.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A chair back and seat linkage structure, comprising a seat plate (1), main support legs (2) fixedly connected to the four corners of the lower surface of the seat plate (1), a slot provided on the upper surface of the seat plate (1), a rotating shaft (3) rotatably connected to the inner wall of the slot, a backrest plate (4) fixedly connected to the surface of the rotating shaft (3), a rectangular groove provided at the front end of the rotating shaft (3), an armrest (5) fixedly connected to the upper surface of the seat plate (1), a cavity provided inside the seat plate (1), a locking component slidably connected to the inner wall of the cavity, and a strip groove provided on the left side of the seat plate (1), a linkage component slidably connected to the inner wall of the strip groove, characterized in that, The locking assembly includes a movable plate (6), a pull rod (7) is fixedly connected to the front of the movable plate (6), a spring (8) is sleeved on the surface of the pull rod (7), and a rectangular rod (9) is fixedly connected to the back of the movable plate (6). The linkage assembly includes a strip plate (10), with two auxiliary support legs (11) fixedly connected to the lower surface of the strip plate (10). A fixing groove is provided on the upper surface of the strip plate (10). An internal threaded sleeve (12) is rotatably connected to the inner wall of the fixing groove. A screw (13) is threadedly connected to the inner wall of the internal threaded sleeve (12). A movable frame (14) is rotatably connected to the right end of the screw (13). A locking bolt (15) is threadedly connected to the inner wall of the movable frame (14). A locking frame (16) is fixedly connected to the left side of the back plate (4). A locking threaded groove is provided on the left side of the locking frame (16). A strip frame (17) is fixedly connected to the front of the seat plate (1). A threaded rod (18) is rotatably connected to the right side of the strip frame (17). A slider (19) is slidably connected to the inner wall of the strip frame (17).

2. The chair back and seat linkage structure according to claim 1, characterized in that, The front of the seat plate (1) is provided with a circular hole that matches the pull rod (7). One end of the spring (8) overlaps with the front of the movable plate (6), and the other end overlaps with the inner wall of the cavity.

3. The chair back and seat linkage structure according to claim 1, characterized in that, The rear end of the rectangular rod (9) extends into the interior of the slot, and the rectangular rod (9) is adapted to the rectangular slot.

4. The chair back and seat linkage structure according to claim 1, characterized in that, The position of the movable frame (14) corresponds to the position of the locking frame (16), and the locking bolt (15) is adapted to the locking thread groove.

5. The chair back and seat linkage structure according to claim 1, characterized in that, The left end of the threaded rod (18) is rotatably connected to the inner wall of the strip frame (17), and the slider (19) is threadedly connected to the threaded rod (18).

6. The chair back and seat linkage structure according to claim 1, characterized in that, The back of the slider (19) extends into the interior of the strip groove and is fixedly connected to the front of the strip plate (10).

Images