Device for adjusting chair back

Abstract

The present invention relates to the field of furniture technology, and specifically discloses a device for adjusting a chair back, comprising a bracket fixed to a chair seat, a support rod portion fixed to the chair back, a wrench and a limit plate, and a shift fork, wherein one end of the support rod portion is movably connected to the bracket. A rotating shaft is fixed to the bracket, and one end of the support rod portion passes through and is movably connected to the rotating shaft. The shift fork is provided with a pair of teeth symmetrically distributed at both ends of the shift fork, and two latching teeth are provided at the lower end of the wrench, one of which can cooperate with a pair of teeth of the lower end shift fork to clamp the wrench to fix it, and the other latching tooth can shift the other pair of teeth to rotate it. A tooth 1 is provided at the upper end of the limit plate, and a tooth 2 is provided at the lower end of the support rod portion to mesh with the tooth 1. A coil spring is connected between the rotating shaft and the support rod portion, and a tension spring is connected between the wrench and the bracket. The present invention is flexible in operation, meets the requirements of different human bodies for chair back tilt angles, improves human comfort, and adapts to the current trend of people pursuing high-quality life requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture, in particular to a device capable of adjusting a chair back. Background Art

[0002] To improve chair comfort, existing adjustable chairs have a device on the side that adjusts the backrest angle. However, this device generally only allows for two or three adjustments: one for a normal upright sitting position, with the back resting directly against the chair, suitable for working. The other two allow for the backrest to tilt at one or two different angles, typically allowing the backrest to rest. People of varying heights, weights, and body types experience different backrest angles. A backrest adjustment with only two or three adjustment levels would not accommodate the needs of different body types, reducing comfort and hindering the current trend of people pursuing a high-quality lifestyle.

[0003] my country's patent authorization announcement number CN213550743U discloses a seat back adjustment device, which discloses that the adjustment device is symmetrically fixed on both sides of the seat, and each side includes a seat fixing plate, a seat back support rod and an adjustment rotating part. The seat fixing plate is fixed on both sides of the seat surface, and a fixed shaft is provided on the seat fixing plate. The seat back support rod is fixed to the side of the seat back, and the end of the seat back support rod is rotatably connected to the fixed shaft. A coil spring is sleeved on the rotating shaft, and the end of the coil spring is tightly wound and clamped on the seat back support rod. Under the pressure of the coil spring, the seat back rotates forward along the fixed shaft. An adjustment wrench is also provided on the seat fixing plate in a lever-like rotation, and a clamping head is provided on the adjustment wrench. A ratchet is provided on the seat back support rod. The clamping head and the ratchet are clamped with each other to maintain the angle of the seat back. Although this device can adjust the chair back to multiple angles, after the clamping head and the ratchet are engaged, if the human body leans against the chair back with too much force, the backward rotation force of the chair back may drive the clamping head to rotate and disengage from the ratchet, making the chair back unstable after adjustment and posing a safety hazard. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a device for adjusting a chair back.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] The invention discloses a device for adjusting a chair back. The device is fixed to the side of a chair and comprises a bracket fixed to a chair seat and a support rod portion fixed to the chair back. One end of the support rod portion is movably connected to the bracket.

[0007] The utility model also includes a wrench, a limit plate and a shift fork which are rotatably arranged on the bracket.

[0008] A rotating shaft is fixed on the bracket, and one end of the support rod passes through and is movably connected to the rotating shaft.

[0009] The shift fork is located at the lower end of the wrench, and is provided with a pair of teeth symmetrically distributed at both ends of the shift fork. Two latching teeth are provided at the lower end of the wrench, one of which can cooperate with a pair of teeth of the shift fork to clamp the wrench to fix it, and the other latching tooth can shift the other pair of teeth to rotate.

[0010] A tooth 1 is provided at the upper end of the limiting plate, and a tooth 2 meshing with the tooth 1 is provided at the lower end of the support rod portion.

[0011] A coil spring is connected between the rotating shaft and the support rod portion, and a tension spring is connected between the wrench and the bracket.

[0012] A waist groove is provided on the rear side plate surface of the limiting plate, and a cylinder is provided on the wrench and is slidably matched in the waist groove.

[0013] The present invention adopts the above-mentioned design. By rotating the wrench, the two locking teeth of the wrench are respectively matched with the two pairs of teeth of the shift fork or the teeth are shifted, thereby clamping the wrench or releasing the wrench; the limit plate and the support rod part are engaged through the teeth. When the wrench is stuck, the cylinder on the wrench is moved to the right end of the waist groove. At this time, the position between the limit plate and the support rod part is fixed, and the two are matched through the teeth, so that the chair back is fixed; when the wrench is released, the cylinder on the wrench is moved to the bottom end position of the waist groove. At this time, the tooth 1 of the limit plate can be disengaged from the tooth 2 of the support rod part, and the support rod part can rotate relatively, so that the angle of the chair back can be adjusted.

[0014] The tension spring can make the locking teeth of the wrench cooperate with a pair of teeth of the shift fork to clamp the wrench more stably and prevent the shift fork from rotating accidentally.

[0015] Preferably, a C-shaped groove is provided at the lower end of the wrench, and the locking teeth are the two end edges of the C-shaped groove.

[0016] The present invention adopts the above-mentioned C-shaped groove design, so that when the shift fork rotates, the end of the shift fork can rotate into the C-shaped groove, that is, the C-shaped groove can accommodate the rotation of the shift fork without interfering with the rotation of the shift fork.

[0017] Preferably, the shift fork is in the shape of a flat rectangular parallelepiped, and the two pairs of teeth are symmetrically distributed at both ends of the length direction of the shift fork. The two teeth adjacent to the shift fork can cooperate with the tooth grooves of a pair of teeth of the shift fork, and the teeth away from the shift fork are slender teeth, which can drive the other pair of teeth of the shift fork to rotate.

[0018] The present invention adopts the above-mentioned design. Among the two latching teeth at the lower end of the wrench, the latching teeth adjacent to the shift fork can cooperate with the tooth grooves of a pair of teeth of the shift fork, and the latching teeth away from the shift fork are slender teeth. These latching teeth can shift the other pair of teeth of the shift fork to rotate and thereby drive the shift fork to rotate; by respectively cooperating or shifting the two latching teeth with the tooth grooves of the two pairs of teeth of the shift fork, the wrench is clamped or released.

[0019] Preferably, the support rod portion includes a long support rod and a fan-shaped support plate, the support plate is fixed to the lower end of the support rod, one end of the support rod passes through and is movably connected to the rotating shaft, the fan-shaped end of the support plate faces downward, and the tooth 2 is arranged at the fan-shaped end of the support plate.

[0020] Preferably, the wrench and the limiting plate are parallel to each other, and the rotating shaft is perpendicular to the support rod and the supporting plate.

[0021] Preferably, the wrench and the shift fork are in the same vertical plane, and the limit plate and the support plate are in the same vertical plane.

[0022] The present invention adopts the above design to ensure that the teeth between the limit plate and the support plate cooperate accurately and do not separate from each other, so that the locking teeth of the wrench and the opposing teeth of the shift fork cooperate accurately and effectively.

[0023] Preferably, a rivet stud is provided on the bracket, and the upper end of the wrench can be rotatably disposed on the rivet stud.

[0024] A second rivet post is provided on the bracket, and the middle portion of the shift fork is movably connected to the second rivet post.

[0025] Preferably, a convex edge is provided at the end of the second rivet column, and a compression spring is provided between the convex edge and the shift fork and is sleeved on the second rivet column.

[0026] The present invention adopts the above design, and applies a certain pressure to the shift fork through the compression spring to prevent the shift fork from rotating under the action of gravity, thereby preventing the wrench and the shift fork from having errors in the fit.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention comprises a wrench, a stop plate, and a shift fork. The stop plate engages with the support rod through teeth. By rotating the wrench, the two teeth of the wrench engage or shift with the two pairs of teeth of the shift fork, thereby locking or releasing the wrench. When the wrench is locked, the cylinder on the wrench moves exactly to the right end of the waist groove, at which point the position between the stop plate and the support rod is fixed. The teeth between the two engage, and the chair back is fixed. When the wrench is released, the cylinder on the wrench moves exactly to the bottom end of the waist groove, at which point the first tooth of the stop plate disengages from the second tooth of the support rod, allowing the support rod to rotate relative to each other, and the chair back angle can be adjusted. This design is ingenious and flexible in operation, meeting the chair back tilt angle requirements of different human bodies, improving human comfort, and adapting to the current trend of people pursuing a high-quality life.

[0029] 2. The present invention arranges the shift fork at the lower end of the wrench, controls the clamping of the wrench by the teeth of the shift fork, and the wrench then limits the fixation or rotation of the support rod part (i.e., the chair back) through the limit plate. The structural design is reasonable, and the shift fork can effectively complete the function of clamping the wrench (fixing the support rod part through the wrench and the limit plate) or loosening the wrench. After the chair back is adjusted, it is fixed and has good stability, avoiding the safety hazard of the chair back rotating due to excessive leaning force of the human body, and is suitable for wide use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 It is a schematic diagram of the partial structure of the support plate and the tooth portion of the limit plate meshing with each other according to the present invention;

[0032] Figure 3 It is a structural schematic diagram of the wrench of the present invention;

[0033] Figure 4 It is a structural schematic diagram of the shift fork of the present invention;

[0034] Figure 5 This is a schematic diagram of the coordination structure of the wrench, the limit plate, and the shift fork when the chair back is adjustable according to the present invention;

[0035] Figure 6 For the present invention Figure 5 Schematic diagram of the structure of the wrench and shift fork when the wrench is turned counterclockwise in the position shown;

[0036] Figure 7 This is a structural schematic diagram of the wrench of the present invention being stuck by the shift fork;

[0037] Figure 8 For the present invention Figure 7 Schematic diagram of the principle structure of the figure shown;

[0038] Figure 9 For the present invention Figure 7 Schematic diagram of the structure of the wrench and shift fork when the wrench is turned counterclockwise in the position shown;

[0039] Figure 10 For the present invention Figure 9 Schematic diagram of the structure of the wrench and shift fork when the wrench is turned counterclockwise in the position shown;

[0040] Figure 11 For the present invention Figure 10 Schematic diagram of the structure of the wrench and shift fork after the wrench is loosened in the position shown.

[0041] In the figure: 1- bracket, 101- rivet column one, 102- rivet column two, 1021- convex edge, 103- rivet column three, 2- support rod part, 201- tooth two, 202- support rod, 203- support plate, 204- rivet column four, 3- wrench, 301- latch tooth, 302- C-shaped groove, 303- cylinder, 4- limit plate, 401- tooth one, 402- waist groove, 5- coil spring, 6- rotating shaft, 7- shift fork, 701- counter tooth, 8- tension spring. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments. However, the following examples are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0043] For this example, please refer to Figures 1-11 A device for adjusting the backrest of a chair is fixed to the side of the chair, and includes a bracket 1 fixed to the seat, a support rod 2 fixed to the backrest of the chair, a wrench 3, a limit plate 4, and a shift fork 7.

[0044] Rivet stud 101 is provided on bracket 1, and the upper end of wrench 3 is rotatably mounted on rivet stud 101. Rivet stud 102 is also provided on bracket 1, and the middle portion of shift fork 7 is movably connected to rivet stud 102. A flange 1021 is provided at the end of rivet stud 102, and a compression spring is provided between flange 1021 and shift fork 7, which is sheathed around rivet stud 102. Rivet stud 103 is also provided on bracket 1, and one end of stop plate 4 is rotatably mounted on rivet stud 103.

[0045] The shift fork 7 is located at the lower end of the wrench 3. It is a flat rectangular parallelepiped with two pairs of teeth 701 symmetrically distributed along its length. A C-shaped groove 302 is provided at the lower end of the wrench 3. The edges of the C-shaped groove 302 are formed by latching teeth 301. The latching teeth 301 adjacent to the shift fork 7 engage with the grooves of the pair of teeth 701 on the shift fork 7 to secure the wrench 3. The latching teeth 301 further away from the shift fork 7 are elongated and can shift the other pair of teeth 701 on the shift fork 7, thereby driving the rotation of the shift fork 7. The two latching teeth 301 alternately engage with or shift the grooves of the two pairs of teeth 701 on the shift fork 7.

[0046] A rotating shaft 6 is welded to bracket 1, with a coil spring 5 connected between it and the support rod 2. A pin is provided on the wrench 3, with one end of a tension spring 8 coiled and fixed to the pin and the other end coiled and fixed to the edge of bracket 1. A waist groove 402 is provided on the rear surface of the stop plate 4, and a cylinder 303 is provided on the wrench 3, which slides into the waist groove 402.

[0047] The support rod portion 2 includes a long support rod 202 and a fan-shaped support plate 203. The support plate 203 is fixed to the lower end of the support rod 202 by rivets. One end of the support rod 202 passes through the rotating shaft 6 and is movably connected to the rotating shaft 6 through a bearing. The fan-shaped end of the support plate 203 faces downward, and tooth 2 201 is arranged at the fan-shaped end of the support plate 203. Tooth 1 401 is provided at the upper end of the limit plate 4. Tooth 201 is meshed with tooth 1 401. There are multiple teeth 201 and tooth 1 401.

[0048] The lower end of the support rod 202 is a disc-shaped structure, and the rotating shaft 6 can rotate through the disc-shaped structure.

[0049] The coil spring 5 is sleeved on the rotating shaft 6, and one end of the coil spring 5 is curled and fixed to the rotating shaft 6. A rivet column 204 is provided at the upper end of the support plate 203, and the other end of the coil spring 5 is curled and fixed to the rivet column 204.

[0050] The wrench 3 and the limit plate 4 are parallel to each other, and the rotating shaft 6 is perpendicular to the support rod 202 and the support plate 203. The wrench 3 and the shift fork 7 are in the same vertical plane, and the limit plate 4 and the support plate 203 are in the same vertical plane.

[0051] When the present invention is in use, when the wrench 3 is loosened (such as Figure 5 ), the wrench 3 is not constrained by the teeth 701 on the fork 7, and the cylinder 303 on the wrench 3 just moves to the bottom end of the waist groove 402. The tooth 1 401 of the limit plate 4 can be disengaged from the tooth 2 201 of the support rod part 2, and the support rod part 2 can rotate relatively. At this time, the inclination angle of the chair back can be adjusted arbitrarily. At this time, the outer end of the locking tooth 301 adjacent to the fork 7 is tangent to one side end face of the fork 7.

[0052] When the chair back is properly tilted, turn the wrench 3 counterclockwise (as shown in the figure). Figure 6 As shown), the tooth 301 away from the fork 7 will have a probe into the left side tooth 701 of the fork 7 and move the tooth 701 to make the fork 7 rotate counterclockwise, and then release the wrench 3. At this time, the tooth 301 adjacent to the fork 7 just matches the tooth groove of the right side tooth 701 of the fork 7, that is, the fork 7 clamps the wrench 3 so that it is fixed and no longer rotates (as shown). Figure 7 As shown), at this time, the circle where the end of the latch 301 rotates with the rivet column 101 as the center of rotation intersects with the circle where the bottom of the tooth groove rotates with the rivet column 102 as the center of rotation (as shown). Figure 8 As shown, because the two circles intersect, the shift fork 7 engages the wrench 3, preventing it from rotating. At this point, the cylinder 303 on the wrench 3 moves to the right end of the waist groove 402, securing the position between the stop plate 4 and the support rod 2. The teeth engaging between the two secure the chair back, preventing it from rotating due to a person leaning against it.

[0053] If the seat back tilt angle needs to be adjusted, the wrench 3 is rotated counterclockwise so that the teeth 301 of the pair of teeth 701 of the shift fork 7 are matched with the tooth grooves. When the teeth 301 are separated from the tooth grooves, the teeth 301 of the wrench 3 away from the shift fork 7 just touch the edge of one side end surface of the shift fork 7 (such as Figure 9 As shown), continue to rotate the wrench 3 counterclockwise, the tooth 301 of the wrench 3 away from the fork 7 pushes the fork 7 to rotate counterclockwise until the end of the tooth 701 of the fork 7 is rotated into the C-shaped groove 302 (as shown). Figure 10 As shown), at this time, loosen the wrench 3, and the wrench 3 rotates clockwise under the tension of the tension spring 8, and the tooth 301 adjacent to the fork 7 just hits the edge of the other side end face of the fork 7 (as shown in FIG. Figure 11 As shown) and push the shift fork 7 to rotate counterclockwise until the outer end of the latch tooth 301 is tangent to the other end face of the shift fork 7 (as shown) Figure 5 As shown), at this time, the state when the wrench 3 is loosened is returned, and then the tilt angle of the chair back can be adjusted arbitrarily, that is, the above steps are repeated.

[0054] The foregoing is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A device for adjusting a chair back, the device being fixed to the side of a chair, comprising a bracket (1) fixed to a chair seat, a support rod (2) fixed to the chair back, one end of the support rod (2) being movably connected to the bracket (1); Its characteristics are: It also includes a wrench (3), a limit plate (4), and a shift fork (7) that are rotatably arranged on the bracket (1); A rotating shaft (6) is fixed on the bracket (1), and one end of the support rod portion (2) passes through and is movably connected to the rotating shaft (6); The shift fork (7) is located at the lower end of the wrench (3), and a pair of teeth (701) symmetrically distributed at both ends of the shift fork (7) are provided on the shift fork (7). Two latching teeth (301) are provided at the lower end of the wrench (3), one of the latching teeth (301) can cooperate with a pair of teeth (701) of the shift fork (7) to clamp the wrench (3) to fix it, and the other latching tooth (301) can shift the other pair of teeth (701) to rotate; The upper end of the limiting plate (4) is provided with a tooth 1 (401), and the lower end of the support rod portion (2) is provided with a tooth 2 (201) meshing with the tooth 1 (401); A coil spring (5) is connected between the rotating shaft (6) and the support rod portion (2), and a tension spring (8) is connected between the wrench (3) and the bracket (1); A waist groove (402) is provided on the rear side surface of the limiting plate (4), and a cylinder (303) is provided on the wrench (3) and is slidably fitted in the waist groove (402); A C-shaped groove (302) is provided at the lower end of the wrench (3), and the latching teeth (301) are the two end edges of the C-shaped groove (302); The support rod portion (2) comprises a long support rod (202) and a fan-shaped support plate (203), wherein the support plate (203) is fixed to the lower end of the support rod (202), one end of the support rod (202) passes through and is movably connected to the rotating shaft (6), the fan-shaped end of the support plate (203) faces downward, and the tooth 2 (201) is arranged at the fan-shaped end of the support plate (203).

2. The device for adjusting the chair back according to claim 1, characterized in that: The shift fork (7) is in the shape of a flat rectangular parallelepiped, and the two pairs of teeth (701) are symmetrically distributed at both ends of the length direction of the shift fork (7). The teeth (301) adjacent to the shift fork (7) of the two latching teeth (301) can be matched with the tooth grooves of a pair of teeth (701) of the shift fork (7), and the latching teeth (301) away from the shift fork (7) are slender teeth, which can shift the other pair of teeth (701) of the shift fork (7) to rotate.

3. The device for adjusting the chair back according to claim 1, characterized in that: The wrench (3) and the limiting plate (4) are parallel to each other, and the rotating shaft (6) is perpendicular to the support rod (202) and the supporting plate (203).

4. The device for adjusting the chair back according to claim 3, characterized in that: The wrench (3) and the shift fork (7) are in the same vertical plane, and the limit plate (4) and the support plate (203) are in the same vertical plane.

5. The device for adjusting the chair back according to claim 1, characterized in that: A rivet post (101) is provided on the bracket (1), and the upper end of the wrench (3) is rotatably disposed on the rivet post (101); A second rivet post (102) is provided on the bracket (1), and the middle portion of the shift fork (7) is movably connected to the second rivet post (102).

6. The device for adjusting the chair back according to claim 5, characterized in that: A convex edge (1021) is provided at the end of the second rivet column (102), and a compression spring sleeved on the second rivet column (102) is provided between the convex edge (1021) and the shift fork (7).

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