Chair with adjustable waist rest

Abstract

The utility model relates to a chair with an adjustable waist rest, which is used for solving the technical problems that in the actual use process of some chairs mentioned in the background technology, only the front-back position of the backrest is adjusted, but the protruding degree of the back shore part of the backrest cannot be adjusted according to the requirements of a user, so that the waist rest becomes an ornament, and even the available space on a seat plate is wasted. Comprising a seat plate, a backup plate fixedly arranged on the rear side of the seat plate and chair legs, and further comprises an elastic back cushion, sliding blocks are fixedly arranged on the upper side and the lower side of the elastic back cushion, a telescopic block is installed between the two sliding blocks, and the telescopic block is used for driving the two sliding blocks to get close to each other or get away from each other so as to change the bending degree of the elastic back cushion. The seat plate comprises a transverse plate and a vertical plate fixedly arranged on the rear portion of the transverse plate, a first installation block is vertically arranged on the vertical plate in a sliding mode, a horizontal second sliding groove is formed in the first installation block, and the elastic back cushion is arranged in the second sliding groove in a sliding mode.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture, in particular to a chair with an adjustable waist support. Background Art

[0002] Chairs are an important tool in daily life, but the lumbar supports in many seats are not easy to adjust. Because different users have different needs or preferences for comfort, such as the position and protrusion of the lumbar support, the lumbar supports in existing seats cannot meet the needs of different users, which will reduce the user experience.

[0003] There are some office chairs with adjustable lumbar support in the prior art. For example, the utility model patent document with authorization announcement number "CN215820307U" and patent name "A chair with adaptively adjustable lumbar support" discloses a chair, which includes a lumbar support and an elastic member. An adaptively adjustable elastic member is arranged between the lower end of the lumbar support and the leaning surface to keep the lower end of the lumbar support suspended.

[0004] However, in actual use, the above patent document only adjusts the front and rear position of the backrest, but cannot adjust the protrusion of the top support part of the backrest according to the user's needs. Therefore, the user's lumbar spine is not comfortable against the backrest, which may cause the lumbar support to become a decoration, and even cause a waste of available space on the seat plate. Utility Model Content

[0005] In view of the deficiencies existing in the prior art, the utility model provides a chair with an adjustable lumbar support, which is used to solve the technical problem that some chairs mentioned in the background technology can only adjust the front and rear position of the backrest during actual use, but cannot adjust the protrusion of the top support part of the backrest according to the needs of the user, resulting in the lumbar support becoming a decoration, and even causing a waste of available space on the seat plate.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A chair with adjustable lumbar support, comprising a seat plate, a back plate fixed at the rear side of the seat plate and chair legs, and also comprising an elastic cushion, wherein sliding blocks are fixed at the upper and lower sides of the elastic cushion, a telescopic block is installed between the two sliding blocks, and the telescopic block is used to drive the two sliding blocks to move closer to or away from each other so as to change the bending degree of the elastic cushion, the seat plate comprises a horizontal plate and a vertical plate fixed at the rear of the horizontal plate, a first mounting block is vertically slidably provided on the vertical plate, a horizontal second sliding groove is opened on the first mounting block, and the elastic cushion is slidably arranged in the second sliding groove.

[0008] Working principle:

[0009] When in use, the user slides the elastic cushion vertically to adjust the vertical position of the elastic cushion;

[0010] The user slides the elastic cushion horizontally to adjust the horizontal position of the elastic cushion so that the elastic cushion is located at a position where the user's lumbar spine can rest comfortably.

[0011] Then the user rotates the telescopic block to change the distance between the two sliding blocks, thereby changing the curvature of the elastic cushion to adapt to the curvature of his or her lumbar spine, so that the elastic cushion fits snugly with his or her lumbar spine.

[0012] Beneficial effects:

[0013] In this solution, a telescopic block and two sliding blocks are provided, and the two sliding blocks are driven to move closer to or farther from each other by rotating the telescopic block. The closer to or farther away from each other of the two sliding blocks drive the elastic cushion to bend to different degrees, and the protrusion degree of the top supporting part of the elastic cushion is adjusted, so that the elastic cushion fits the user's lumbar spine better, thereby improving the user's comfort.

[0014] The vertical position of the elastic cushion is changed by arranging a first mounting block that can slide vertically; and the horizontal position of the elastic cushion is changed by arranging a horizontally slidable elastic cushion.

[0015] By changing the vertical and horizontal positions of the elastic cushion and coordinating the protrusion of the top supporting part of the elastic cushion, it can further fit the user's lumbar spine, so it can be adapted to different users and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0017] Figure 2 for Figure 1 A schematic assembly diagram of a cross-section of the middle elastic cushion, the plug-in block, the working block, and the second mounting block;

[0018] Figure 3 for Figure 1 The enlarged structural diagram at A in the middle;

[0019] Figure 4 It is an assembly diagram of the first mounting block, the second rotating shaft, the second locking block, the second locking rod and the second through hole.

[0020] In the above drawings: seat plate 1, back plate 2, elastic back cushion 3, sliding block 4, telescopic block 5, threaded rod 501, threaded sleeve 502, first mounting block 6, second slide groove 7, first slide groove 8, first mounting axis 9, first cavity 10, first bevel gear 11, first rotating axis 12, second bevel gear 13, second mounting axis 14, second mounting block 15, second cavity 16, third bevel gear 17, second rotating axis 18, plug-in groove 19, plug-in block 20, support block 21, working block 22, sliding hole 23, third rotating axis 24, fifth bevel gear 25, sixth bevel gear 26, effort-saving handle 27, fourth bevel gear 28, chair leg 29, bearing 30, support rod 31, horizontal plate 32, vertical plate 33, first locking block 34, first locking rod 35, first through hole 36, second locking block 37, second locking rod 38, second through hole 39. DETAILED DESCRIPTION

[0021] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Example:

[0023] like Figure 1 to Figure 3 As shown, a chair with adjustable lumbar support includes a seat plate 1, a back plate 2 fixed to the rear side of the seat plate 1 and a chair leg 29, and also includes an elastic cushion 3, wherein sliding blocks 4 are fixed on the upper and lower sides of the elastic cushion 3, and a telescopic block 5 is installed between the two sliding blocks 4, and the telescopic block 5 is used to drive the two sliding blocks 4 to move closer to or away from each other so as to change the bending degree of the elastic cushion 3. The seat plate 1 includes a horizontal plate 32 and a vertical plate 33 fixed to the rear of the horizontal plate 32, and a first mounting block 6 is vertically slidably provided on the vertical plate 33, and a horizontal second sliding groove 7 is opened on the first mounting block 6, and the elastic cushion 3 is slidably arranged in the second sliding groove 7.

[0024] In this solution, by setting a telescopic block 5 and two sliding blocks 4, the two sliding blocks 4 are driven to move closer to or farther from each other by rotating the telescopic block 5, and the two sliding blocks 4 move closer to or farther from each other to drive the elastic cushion 3 to bend to different degrees, and the protrusion degree of the top supporting part of the elastic cushion 3 is adjusted, so that the elastic cushion 3 fits the user's lumbar spine better, thereby improving the user's comfort.

[0025] By providing a vertically sliding first mounting block 6, the vertical position of the elastic cushion 3 can be changed; by providing a horizontally slidable elastic cushion 3, the horizontal position of the elastic cushion 3 can be changed. By changing the vertical and horizontal positions of the elastic cushion 3 and coordinating the protrusion of the top supporting part of the elastic cushion 3, the elastic cushion 3 can be further fitted to the user's lumbar spine, so that it can be used by different users and has strong practicality.

[0026] like Figure 1 and Figure 3As shown, a vertical first sliding groove 8 is provided on the vertical plate 33, and a vertical first mounting shaft 9 is rotatably installed in the first sliding groove 8. The first mounting shaft 9 is a threaded rod structure. The first mounting block 6 is divided into a working part and a sliding part. The sliding part of the first mounting block 6 is sleeved on the first mounting shaft 9 and is threadedly connected with the first mounting shaft 9. The vertical plate 33 is also provided with a first cavity 10 on the side close to the back plate 2. The first cavity 10 is located below the first sliding groove 8. The bottom end of the first mounting shaft 9 extends into and is rotatably arranged in the first cavity 10. The bottom end of the first mounting shaft 9 is fixedly sleeved with a first bevel gear 11, and a first rotating shaft 12 is rotatably penetrated through the side wall of the vertical plate 33. A second bevel gear 13 is fixedly sleeved on the first rotating shaft 12. The first bevel gear 11 is meshed with the second bevel gear 13 and are both arranged in the first cavity 10. A handle is fixedly provided at one end of the first rotating shaft 12 located on the outer side of the vertical plate 33.

[0027] By setting the first slide groove 8, the first installation shaft 9, the first cavity 10, the first bevel gear 11, the first rotating shaft 12 and the second bevel gear 13, the user manually rotates the first rotating shaft 12 to cause the first installation block 6 and the elastic cushion 3 to move vertically, thereby changing the vertical position of the elastic cushion 3.

[0028] like Figure 1 and Figure 3 As shown, the second slide groove 7 is provided on the upper surface of the working part of the first mounting block 6, and a horizontal second mounting shaft 14 is rotatably installed in the second slide groove 7, the second mounting shaft 14 is a threaded rod structure, and a second mounting block 15 is slidably sleeved on the second mounting shaft 14. The second mounting block 15 is divided into a mounting part and a movable part. The movable part of the second mounting block 15 is sleeved on the second mounting shaft 14 and is threadedly connected to the second mounting shaft 14. The elastic cushion 3 is arranged above the mounting part of the second mounting block 15, and a second cavity 1 is also provided on the side wall of the second slide groove 7. 6, one end of the second mounting shaft 14 is rotatably disposed in the second cavity 16, one end of the second mounting shaft 14 is fixedly sleeved with a third bevel gear 17, a second rotating shaft 18 is rotatably penetrated through the side wall of the first mounting block 6 located outside the second cavity 16, a fourth bevel gear 28 is fixedly sleeved on the second rotating shaft 18, the third bevel gear 17 is meshed with the fourth bevel gear 28 and both are disposed in the second cavity 16; it also includes a first locking assembly for locking the second rotating shaft 18, and a handle is fixedly disposed at one end of the second rotating shaft 18 located outside the first mounting block 6.

[0029] By setting the second mounting shaft 14, the second mounting block 15, the second cavity 16, the third bevel gear 17, the second rotating shaft 18, the fourth bevel gear 28 and the first locking assembly, the user rotates the second rotating shaft 18 to cause the second mounting block 15 and the elastic cushion 3 to slide horizontally, thereby changing the horizontal position of the elastic cushion 3, and finally the first locking assembly locks the second rotating shaft 18 to prevent the second rotating shaft 18 from rotating.

[0030] like Figure 1 and Figure 2 As shown, two insertion slots 19 are provided on the mounting portion of the second mounting block 15, two insertion blocks 20 are inserted into the two insertion slots 19, a support block 21 is fixedly arranged on the two insertion blocks 20, and the elastic cushion 3 is arranged on the support block 21. By providing the insertion slots 19, the insertion blocks 20 and the support block 21, during installation, the user installs the elastic cushion 3 by inserting the insertion blocks 20 into the insertion slots 19.

[0031] like Figure 2 As shown, both sides of the support block 21 are fixedly connected with a working block 22 of a hollow structure, and two vertical sliding holes 23 are opened on the opposite sides of the two working blocks 22. The two sliding blocks 4 are parallel, and one end of the two sliding blocks 4 on the same side is respectively located in the two sliding holes 23 on the same working block 22. By setting the working block 22 and the sliding hole 23, the sliding direction of the two sliding blocks 4 is limited.

[0032] like Figure 2 As shown, the telescopic block 5 is composed of two threaded rods 501 and a threaded sleeve 502, the outer wall of the threaded sleeve 502 is fixedly sleeved with a bearing 30, the outer wall of the bearing 30 is fixedly sleeved with a support rod 31, the support rod 31 is fixedly connected to one of the working blocks 22, one end of the two threaded rods 501 is respectively fixedly connected to the two sliding blocks 4, and the two threaded rods 501 are located in the same vertical direction, the two ends of the threaded sleeve 502 are respectively threadedly connected to the other ends of the two threaded rods 501, a third rotating shaft 24 is rotatably penetrated through the side wall of one of the working blocks 22, the third rotating shaft 24 is fixedly sleeved with a fifth bevel gear 25 at one end close to the telescopic block 5, a sixth bevel gear 26 is fixedly sleeved on the threaded sleeve 502, and the fifth bevel gear 25 is meshed with the sixth bevel gear 26; and a second locking component for locking the third rotating shaft 24 is also included.

[0033] By setting the bearing 30, the support rod 31, the third rotating shaft 24, the fifth bevel gear 25, the sixth bevel gear 26 and the second locking assembly, the user rotates the third rotating shaft 24 to drive the two sliding blocks 4 to move closer or farther from each other, and the two sliding blocks 4 move closer or farther from each other to drive the elastic cushion 3 to bend to different degrees, thereby adjusting the protrusion of the supporting part of the elastic cushion 3, and finally the second locking assembly locks the third rotating shaft 24 to prevent the third rotating shaft 24 from rotating. Figure 2 As shown, a labor-saving handle 27 is fixedly arranged at one end of the third rotating shaft 24 located outside the working block 22. The labor-saving handle 27 is provided to facilitate the user to rotate the third rotating shaft 24.

[0034] like Figure 2 As shown, the second locking assembly includes a first locking block 34 fixedly mounted on the third rotating shaft 24, a first locking rod 35 is provided at the end of the first locking block 34, the first locking block 34 and the first locking rod 35 are connected by a chain, a first through hole 36 is formed on the first locking block 34, and the side wall of the working block 22 through which the third rotating shaft 24 rotates and passes is also formed with first through holes 36 distributed along the circumferential direction, the first locking rod 35 is used to penetrate into the first through hole 36 on the first locking block 34 after the third rotating shaft 24 rotates, and then penetrate into the corresponding first through hole 36 on the side wall of the working block 22, so as to lock the third rotating shaft 24.

[0035] By providing the first locking block 34, the first locking rod 35 and the first through hole 36, when the user rotates the third rotating shaft 24 to adjust the protrusion of the supporting part of the elastic cushion 3 to a suitable curvature, the first locking rod 35 is inserted into the first through hole 36 on the first locking block 34 and then into the corresponding first through hole 36 on the side wall of the working block 22 to lock the third rotating shaft 24.

[0036] like Figure 3 and Figure 4 As shown, the first locking assembly includes a second locking block 37 fixed on the second rotating shaft 18, and a second locking rod 38 is provided at the end of the second locking block 37. The second locking block 37 and the second locking rod 38 are connected by a chain. The second locking block 37 is provided with a second through hole 39, and the side wall of the first mounting block 6 is also provided with second through holes 39 distributed along the circumferential direction. The second locking rod 38 is used to penetrate into the second through hole 39 on the second locking block 37 after the second rotating shaft 18 rotates, and then penetrate into the corresponding second through hole 39 on the side wall of the first mounting block 6, so as to lock the second rotating shaft 18.

[0037] By setting the second locking block 37, the second locking rod 38 and the second through hole 39, when the user rotates the second rotating shaft 18 to move the elastic cushion 3 to a suitable position, the second locking rod 38 is inserted into the second through hole 39 on the second locking block 37 and then into the corresponding second through hole 39 on the side wall of the first mounting block 6 to lock the second rotating shaft 18.

[0038] Working principle:

[0039] First, the user installs the elastic cushion 3 by aligning the plug-in block 20 with the plug-in slot 19 and plugging it into the plug-in slot 19;

[0040] When in use, the user manually rotates the first rotating shaft 12, the rotation of the first rotating shaft 12 drives the second bevel gear 13 to rotate, the rotation of the second bevel gear 13 drives the first bevel gear 11 to rotate, the rotation of the first bevel gear 11 drives the first installation shaft 9 to rotate, the rotation of the first installation shaft 9 drives the first installation block 6 and the elastic cushion 3 to move vertically, and adjust the vertical position of the elastic cushion 3;

[0041] Then the user manually rotates the second rotating shaft 18, and the rotation of the second rotating shaft 18 drives the fourth bevel gear 28 to rotate, and the rotation of the fourth bevel gear 28 drives the third bevel gear 17 to rotate, and the rotation of the third bevel gear 17 drives the second installation shaft 14 to rotate, and the rotation of the second installation shaft 14 drives the second installation block 15 and the elastic cushion 3 to move horizontally, and adjust the horizontal position of the elastic cushion 3 so that the elastic cushion 3 is located at a position where the user's lumbar spine can lean comfortably, and then the second locking rod 38 is inserted into the second through hole 39 on the second locking block 37 and then into the corresponding second through hole 39 on the side wall of the first installation block 6 to lock the second rotating shaft 18;

[0042] Then the user rotates the labor-saving handle 27 to drive the third rotating shaft 24 to rotate, and the rotation of the third rotating shaft 24 drives the fifth bevel gear 25 to rotate, and the rotation of the fifth bevel gear 25 drives the sixth bevel gear 26 to rotate, and the rotation of the sixth bevel gear 26 drives the threaded sleeve 502 to rotate, and the rotation of the threaded sleeve 502 drives the two threaded rods 501 and the corresponding sliding blocks 4 to approach or move away from each other, and the mutual approach or distance of the two sliding blocks 4 drives the elastic cushion 3 to bend to different degrees, thereby adjusting the protrusion of the top supporting part of the elastic cushion 3 to adapt to one's own lumbar curvature, so that the elastic cushion 3 fits one's own lumbar spine. Finally, the first locking rod 35 is inserted into the first through hole 36 on the first locking block 34 and then into the corresponding first through hole 36 on the side wall of the working block 22 to lock the third rotating shaft 24, and the whole operation is completed.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A chair with adjustable lumbar support, comprising a seat plate (1), a back plate (2) fixed to the rear side of the seat plate (1), and a chair leg (29), characterized in that: The seat plate (1) further comprises an elastic cushion (3), wherein sliding blocks (4) are fixedly arranged on the upper and lower sides of the elastic cushion (3), and a telescopic block (5) is installed between the two sliding blocks (4), and the telescopic block (5) is used to drive the two sliding blocks (4) to move closer to or farther from each other so as to change the bending degree of the elastic cushion (3); the seat plate (1) comprises a transverse plate (32) and a vertical plate (33) fixedly arranged at the rear of the transverse plate (32), and a first mounting block (6) is vertically slidably arranged on the vertical plate (33), and a horizontal second sliding groove (7) is opened on the first mounting block (6), and the elastic cushion (3) is slidably arranged in the second sliding groove (7).

2. The chair with adjustable lumbar support according to claim 1, characterized in that: The vertical plate (33) is provided with a first vertical slide groove (8), in which a first vertical installation shaft (9) is rotatably installed, the first installation shaft (9) is a threaded rod structure, the first installation block (6) is divided into a working part and a sliding part, the sliding part of the first installation block (6) is sleeved on the first installation shaft (9) and is threadedly connected to the first installation shaft (9), and the vertical plate (33) is also provided with a first cavity (10) on a side close to the back plate (2), the first cavity (10) is located below the first slide groove (8), the bottom end of the first installation shaft (9) extends into and is rotatably arranged in the first cavity (10), the bottom end of the first installation shaft (9) is fixedly sleeved with a first bevel gear (11), the side wall of the vertical plate (33) is rotatably penetrated with a first rotating shaft (12), the first rotating shaft (12) is fixedly sleeved with a second bevel gear (13), the first bevel gear (11) is meshed with the second bevel gear (13) and both are arranged in the first cavity (10).

3. The chair with adjustable lumbar support according to claim 1, characterized in that: The second slide groove (7) is provided on the upper surface of the working part of the first mounting block (6), and a horizontal second mounting shaft (14) is rotatably mounted in the second slide groove (7); the second mounting shaft (14) is a threaded rod structure; a second mounting block (15) is slidably sleeved on the second mounting shaft (14); the second mounting block (15) is divided into a mounting part and a movable part; the movable part of the second mounting block (15) is sleeved on the second mounting shaft (14) and is threadedly connected to the second mounting shaft (14); the elastic cushion (3) is arranged above the mounting part of the second mounting block (15); A second cavity (16) is also provided on the side wall, one end of the second mounting shaft (14) is rotatably arranged in the second cavity (16), one end of the second mounting shaft (14) is fixedly sleeved with a third bevel gear (17), a second rotating shaft (18) is rotatably penetrated through the side wall of the first mounting block (6) located outside the second cavity (16), a fourth bevel gear (28) is fixedly sleeved on the second rotating shaft (18), the third bevel gear (17) is meshed with the fourth bevel gear (28) and both are arranged in the second cavity (16); and a first locking component for locking the second rotating shaft (18) is also included.

4. The chair with adjustable lumbar support according to claim 3, characterized in that: Two plug-in slots (19) are provided on the mounting portion of the second mounting block (15), two plug-in blocks (20) are plugged into the two plug-in slots (19), a support block (21) is fixedly arranged on the two plug-in blocks (20), and the elastic cushion (3) is arranged on the support block (21).

5. The chair with adjustable lumbar support according to claim 4, characterized in that: Working blocks (22) with a hollow structure are fixedly connected to both sides of the support block (21); two vertical sliding holes (23) are opened on opposite sides of the two working blocks (22); the two sliding blocks (4) are parallel, and one end of the two sliding blocks (4) located on the same side is respectively located in the two sliding holes (23) on the same working block (22).

6. The chair with adjustable lumbar support according to claim 5, characterized in that: The telescopic block (5) is composed of two threaded rods (501) and a threaded sleeve (502). A bearing (30) is fixedly sleeved on the outer wall of the threaded sleeve (502). A support rod (31) is fixedly mounted on the outer wall of the bearing (30). The support rod (31) is fixedly connected to one of the working blocks (22). One end of the two threaded rods (501) is respectively fixedly connected to two sliding blocks (4). The two threaded rods (501) are located in the same vertical direction. Both ends of the threaded sleeve (502) are fixedly connected to the two sliding blocks (4). The third rotating shaft (24) is rotatably penetrated through the side wall of one of the working blocks (22); a fifth bevel gear (25) is fixedly sleeved on one end of the third rotating shaft (24) close to the telescopic block (5); a sixth bevel gear (26) is fixedly sleeved on the threaded sleeve (502); the fifth bevel gear (25) is meshed with the sixth bevel gear (26); and a second locking component for locking the third rotating shaft (24) is also included.

7. The chair with adjustable lumbar support according to claim 6, characterized in that: A labor-saving handle (27) is fixedly provided at one end of the third rotating shaft (24) located outside the working block (22).

8. The chair with adjustable lumbar support according to claim 6, characterized in that: The second locking assembly comprises a first locking block (34) fixedly mounted on the third rotating shaft (24); a first locking rod (35) is disposed at an end of the first locking block (34); the first locking block (34) and the first locking rod (35) are connected via a chain; a first through hole (36) is formed on the first locking block (34); a side wall of the working block (22) through which the third rotating shaft (24) rotates and passes is also provided with first through holes (36) distributed along a circumferential direction; the first locking rod (35) is used to penetrate into the first through hole (36) on the first locking block (34) and then penetrate into the corresponding first through hole (36) on the side wall of the working block (22) after the third rotating shaft (24) rotates, so as to lock the third rotating shaft (24).

9. The chair with adjustable lumbar support according to claim 3, characterized in that: The first locking assembly comprises a second locking block (37) fixedly mounted on the second rotating shaft (18); a second locking rod (38) is disposed at an end of the second locking block (37); the second locking block (37) and the second locking rod (38) are connected via a chain; a second through hole (39) is formed on the second locking block (37); a second through hole (39) distributed along a circumferential direction is also formed on a side wall of the first mounting block (6); the second locking rod (38) is used to penetrate into the second through hole (39) on the second locking block (37) and then penetrate into a corresponding second through hole (39) on the side wall of the first mounting block (6) as the second rotating shaft (18) rotates, thereby locking the second rotating shaft (18).

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