Angle adjusting block and angle-adjustable seat armrest structure

Abstract

The utility model discloses an angle adjusting block and an angle-adjustable seat armrest structure, which are characterized in that the angle adjusting block comprises an adjusting block main body, and a mounting hole is formed in the dead center of the adjusting block main body; an upper groove and a lower groove are formed in the top and the bottom of the adjusting block body respectively, and a left groove is formed in the left side of the adjusting block body. The upper groove is of a V-shaped structure with an opening in the top, the right end of the left side face of the upper groove is connected with the left end of the right side face of the upper groove, and the length of the left side face of the upper groove is larger than that of the right side face of the upper groove. The lower groove is of a V-shaped structure with an opening in the bottom, the right end of the left side face of the lower groove is connected with the left end of the right side face of the lower groove, and the length of the right side face of the lower groove is larger than that of the left side face of the lower groove. The angle adjusting block is arranged between the armrest and the seat and is used for rotationally adjusting and limiting the armrest. The use stability is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to a seat accessory, in particular to an angle adjustment block and an angle-adjustable seat armrest structure. Background Art

[0002] A seat is a product that provides support to the user. In cars, scooters and other vehicles, seats with backrests are indispensable. In order to improve the comfort of passengers, many seats have armrests on one or both sides to support the passengers' hands or to protect the passengers from falling off the side of the seats.

[0003] Among them, in the prior art, the types of armrests include fixed armrests and rotatable armrests. For rotatable armrests, there are generally the following structures:

[0004] The first type: when the armrest is turned up and placed beside the backrest, the side of the seat is opened; when the armrest is turned down, a support is set at the connection between the armrest and the seat to support the armrest so that the armrest is basically parallel to the horizontal plane, which is convenient for the user to place his hand. In this structure, the structure is relatively simple, but the aesthetics is not good;

[0005] The second type: using a ratchet structure (toothed disc structure), using the cooperation of convex teeth and springs to clamp the corresponding position of the ratchet for positioning. This structure is relatively complex, the cost is relatively high, and the size is also relatively large;

[0006] The third type: The most common handrail structure on buses has a rotatable block inside. The handrail is rotated by connecting the clamping block on the handrail with the clamping slot on the rotatable block. However, the rotatable block can rotate 360 ​​degrees, which is prone to jamming and poor stability. It is also inconvenient to assemble in many cases. Summary of the invention

[0007] The utility model aims to provide an angle adjustment block and an angle-adjustable chair armrest structure, by using the structure, the stability of the armrest angle adjustment can be ensured, the armrest can be effectively prevented from loosening during use, the service life can be extended, and the assembly defect rate can be reduced.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an angle adjustment block, comprising an adjustment block body, wherein a mounting hole is provided at the exact center of the adjustment block body;

[0009] The top and bottom of the adjusting block body are respectively provided with an upper groove and a lower groove, and the left side of the adjusting block body is provided with a left groove;

[0010] The upper groove is a V-shaped structure with an open top, the right end of the left side of the upper groove is connected to the left end of the right side of the upper groove, and the length of the left side of the upper groove is greater than the length of the right side of the upper groove;

[0011] The lower groove is a V-shaped structure with an open bottom, the right end of the left side of the lower groove is connected to the left end of the right side of the lower groove, and the length of the right side of the lower groove is greater than the length of the left side of the lower groove.

[0012] In the above technical solution, a right groove is further provided on the right side of the adjusting block body, and the left groove and the right groove are symmetrically arranged on the left and right sides of the mounting hole respectively.

[0013] In the above technical solution, the mounting hole passes through the front end face and the rear end face of the adjusting block body, and a clearance hole coaxially arranged with the mounting hole is provided on the front end face of the adjusting block body, and the diameter of the clearance hole is larger than the diameter of the mounting hole;

[0014] And / or, the right side of the left groove is connected to the left side of the clearance hole, and the left side of the right groove is connected to the right side of the clearance hole;

[0015] And / or, the front end surfaces of the left groove and the right groove are connected to the front end surface of the adjustment block body.

[0016] In the above technical solution, the two ends of the top of the upper groove are connected to the top of the left side and right side of the adjusting block body through arc surfaces respectively;

[0017] The arc-shaped surfaces at both ends of the bottom of the lower groove are connected to the bottom of the left side and the right side of the adjusting block body;

[0018] And / or, the front ends and rear ends of the upper groove and the lower groove respectively penetrate the front end surface and the rear end surface of the adjustment block body.

[0019] The utility model also provides an angle-adjustable chair armrest structure, comprising an armrest rotatably connected to the seat, the bottom of the armrest being rotatably connected to the seat via a connecting piece, and the armrest outside the connecting piece being provided with a left wall, a right wall, a lower corner tip, an upper corner tip and a middle corner tip;

[0020] It also includes the above-mentioned angle adjustment block, wherein the adjustment block body is rotatably connected to the seat through a connecting shaft passing through the mounting hole, the connecting shaft is arranged at the lower right side of the connecting member, and the adjustment block body is rotatably arranged between the left wall and the right wall;

[0021] When the middle angle tip abuts against the upper groove, the adjusting block body restricts the clockwise rotation of the armrest;

[0022] When the top of the adjusting block body abuts against the right wall, the adjusting block body restricts the clockwise rotation of the armrest;

[0023] When the lower corner tip abuts against the lower groove, the adjusting block body restricts the armrest from rotating counterclockwise;

[0024] When the lower corner tip abuts against the left groove and the left top of the upper groove abuts against the left wall, the adjusting block body restricts the armrest from rotating counterclockwise.

[0025] In the above technical solution, the bottom of the handrail is coaxially provided with an inner ring, an intermediate ring and an outer ring, and the connecting member is inserted in the inner ring;

[0026] The middle ring is provided with an inner notch, the inner end of the left wall is connected to the outer wall of the inner ring, the middle of the left wall is connected to the left side of the inner notch, and the outer end of the left wall is connected to the inner wall of the outer ring;

[0027] A middle plate is also provided, the outer end of the middle plate is connected to the right end of the inner notch, the inner end of the middle plate is connected to the outer surface of the inner ring, and the connection between the outer end of the middle plate and the middle ring forms the middle angle tip;

[0028] The right side wall is arranged on the right side of the middle plate, the inner end of the right side wall is connected to the outer surface of the middle ring, and the outer end of the right side wall is connected to the inner surface of the outer ring;

[0029] An outer notch is provided on the outer ring, the outer ring end at the left end of the outer notch constitutes the lower corner tip, the outer ring end at the right end of the outer notch constitutes the upper corner tip, the lower corner tip is arranged rearwardly opposite to the middle of the inner notch, and the upper corner tip is arranged between the middle plate and the right side wall.

[0030] In the above technical solution, the width between the inner ring and the outer ring is greater than the width of the regulating block body;

[0031] And / or, the length of the regulating block body is greater than the width between the inner ring and the outer ring.

[0032] In the above technical solution, when the lower corner tip abuts against the lower groove, the middle corner tip is arranged opposite to the upper groove, and a distance is provided between the middle corner tip and the upper groove;

[0033] And / or, when the lower corner tip abuts against the left groove and the left top of the upper groove abuts against the left wall, the middle corner tip is arranged opposite to the right side surface of the adjustment block body above the mounting hole.

[0034] In the above technical solution, when the top of the adjusting block body abuts against the right wall, the lower groove is arranged in the outer notch;

[0035] And / or, the rotation angle of the adjustment block body in the armrest is less than 180°.

[0036] In the above technical solution, when the middle angle tip is against the upper groove, the angle between the top plane of the armrest and the top plane of the seat is 0° to 5°;

[0037] And / or, when the top of the adjusting block body abuts against the right wall, the top surface of the handrail is arranged to tilt downward from left to right;

[0038] and / or, when the lower corner tip abuts against the lower groove, the top surface of the handrail is arranged to tilt upward from left to right;

[0039] And / or, when the lower corner tip abuts against the left groove and the left top of the upper groove abuts against the left wall, the top surface of the handrail is inclined upward from left to right.

[0040] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0041] 1. In the utility model, an upper groove and a lower groove are respectively arranged at the top and bottom of the angle adjustment block body, and a left groove is arranged on the left side of the angle adjustment block body, so that when in use, the lower groove of the angle adjustment block will not rotate upward, which can effectively prevent the occurrence of jamming and failure, ensure the stability of the handrail during the adjustment process, reduce the maintenance rate, and extend the service life;

[0042] 2. In the utility model, the upper groove and the lower groove are both V-shaped structures, and the side lengths on both sides of the V-shaped structure are inconsistent. In this way, when the armrest rotates, the corresponding corner tip is inserted into the corresponding upper groove or lower groove, so that the angle adjustment block body and the corresponding corner tip limit the rotation of the armrest, thereby achieving the adjustment of the armrest angle, and the rotation angle of the angle adjustment block is limited, thereby preventing failure and ensuring stability in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of the angle adjustment block in the first embodiment of the utility model;

[0044] Figure 2 It is an exploded view of the armrest and the seat in the first embodiment of the utility model;

[0045] Figure 3 It is a structural schematic diagram of the handrail in the first embodiment of the utility model;

[0046] Figure 4 yes Figure 3 A partial enlarged view of

[0047] Figure 5 It is a schematic diagram of the structure of the connection between the armrest and the adjustment block body in the first embodiment of the utility model (the armrest and the top plane of the seat are basically flat, and the middle corner tip is against the upper groove at this time);

[0048] Figure 6 yes Figure 5 A partial enlarged view of the

[0049] Figure 7 It is a schematic diagram of the structure of the connection between the armrest and the adjusting block body in the first embodiment of the utility model (the top of the armrest tilts upward from left to right, and the lower corner tip is against the left groove at this time);

[0050] Figure 8 yes Figure 7 A partial enlarged view of

[0051] Fig. 9 It is a schematic diagram of the structure of the connection between the armrest and the adjusting block body in the first embodiment of the present utility model (the top of the armrest tilts downward from left to right, and the top of the adjusting block body is against the right wall at this time);

[0052] Fig.10 yes Fig. 9 A partial enlarged view of

[0053] Fig.11 It is a structural schematic diagram of the connection between the armrest and the adjusting block body in the first embodiment of the utility model (the top of the armrest tilts downward from left to right, and the lower corner tip is against the lower groove at this time);

[0054] Fig.12 yes Fig.11 A partial enlarged view of .

[0055] Among them: 1. Adjustment block body; 2. Mounting hole; 3. Upper slot; 4. Lower slot; 5. Left slot; 6. Arc surface; 7. Seat; 8. Armrest; 9. Connector; 10. Left wall; 11. Right wall; 12. Lower corner tip; 13. Upper corner tip; 14. Middle corner tip; 15. Connecting shaft; 16. Connecting plate; 17. Armrest plate; 18. Right slot; 19. Clearance hole; 20. Inner ring; 21. Middle ring; 22. Outer ring; 23. Inner notch; 24. Middle plate; 25. Outer notch; DETAILED DESCRIPTION

[0056] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0057] Example 1: See Figures 1 to 12 As shown, an angle adjustment block comprises an adjustment block body 1, wherein a mounting hole 2 is provided at the center of the adjustment block body 1;

[0058] The top and bottom of the adjusting block body 1 are respectively provided with an upper groove 3 and a lower groove 4, and the left side of the adjusting block body 1 is provided with a left groove 5;

[0059] The upper groove 3 is a V-shaped structure with an open top, the right end of the left side of the upper groove 3 is connected to the left end of the right side of the upper groove 3, and the length of the left side of the upper groove 3 is greater than the length of the right side of the upper groove 3;

[0060] The top ends of the upper groove 3 are connected to the top of the left side and right side of the adjusting block body 1 through the arc surface 6; the bottom ends of the lower groove 4 are connected to the bottom of the left side and right side of the adjusting block body 1 through the arc surface 6; that is, the connection between the upper groove and the left side of the adjusting block body will be located above the left of the connection between the upper groove and the right side of the adjusting block body. The connection between the lower groove and the right side of the adjusting block body will be located below the right of the connection between the lower groove and the left side of the adjusting block.

[0061] The lower groove is a V-shaped structure with an open bottom, the right end of the left side of the lower groove is connected to the left end of the right side of the lower groove, and the length of the right side of the lower groove is greater than the length of the left side of the lower groove.

[0062] See also Figures 2 to 12 As shown, the utility model also provides an angle-adjustable chair armrest structure, including an armrest 8 rotatably connected to a seat 7, the bottom of the armrest 8 being rotatably connected to the seat 7 via a connecting member 9, a left wall 10, a right wall 11, a lower corner tip 12, an upper corner tip 13 and a middle corner tip 14 being provided on the armrest 8 outside the connecting member 9; and also including the above-mentioned angle adjustment block, the adjustment block body 1 being rotatably connected to the seat 7 via a connecting shaft 15 passing through the mounting hole 2, the connecting shaft 15 being arranged at the lower right side of the connecting member 9, and the adjustment block body 1 being rotatably arranged between the left wall 10 and the right wall 11.

[0063] In this embodiment, the armrest 8 includes a connecting plate 16 and an armrest plate 17, wherein the connecting plate and the armrest plate form an L-shaped or V-shaped structure, wherein the left side of the armrest plate is connected to the top of the connecting plate, and the bottom of the connecting plate is rotatably connected to the seat through a connecting piece, wherein the top surface of the armrest plate is used for supporting and placing the hand. The left wall, the right wall, the lower corner tip, the upper corner tip and the middle corner tip are all arranged at the bottom front side of the connecting plate, wherein the armrest angle can be adjusted by the cooperation of the left wall, the right wall, the lower corner tip, the upper corner tip, the middle corner tip and the upper groove, the lower groove and the left groove on the main body of the angle adjustment block.

[0064] Among them, see Figure 5 , 6As shown, when the middle angle tip 14 is against the upper groove 3, the adjustment block body 1 limits the clockwise rotation of the armrest; wherein, in this state, the two sides of the middle angle tip are against the left side and the right side of the upper groove respectively. Since the length of the left side of the upper groove is greater than the length of its right side, at the same time, the middle angle tip wants to move downward, and the upper groove will be pushed by it so that the right side of the upper groove wants to move upward, and the two conflict with each other. Therefore, the armrest cannot rotate to the right, that is, it cannot rotate clockwise. At this time, the angle between the top plane of the armrest and the top plane of the seat is 0°~5°, that is, the angle between the top plane of the armrest board and the top plane of the seat is 0°~5°. In this embodiment, the top plane of the armrest board is parallel to the top plane of the seat, so that when the user sits on the seat, the hand can be placed directly on the armrest board, and the armrest plays a role in supporting and placing the hand.

[0065] See also Fig. 9 , 10 As shown, when the top of the adjusting block body 1 is against the right side wall 11, the adjusting block body 1 limits the clockwise rotation of the armrest 8; wherein, in this state, the top surface of the armrest is tilted downward from left to right, that is, the top surface of the armrest board is tilted downward from left to right; at this time, the connecting plate will rotate clockwise to the side of the seat, and the right end of the armrest board will be below the top surface of the seat, so that the side of the seat can be opened, which is convenient for passengers to sit directly on the seat from the side of the seat, or get off the seat. And in this state, the armrest cannot continue to rotate along the trend. At this time, the clockwise rotation angle of the armrest board reaches the limit and cannot continue to rotate. It can only rotate counterclockwise in the opposite direction, that is, the armrest board gradually rises above the top plane of the seat, which is used to limit the side of the seat and facilitate the placement and support of the user's hands. At this time, the armrest cannot be lowered and can only be adjusted upward.

[0066] See also Figure 7 , 8 As shown, when the lower angle tip 12 abuts against the left groove 5 and the left top of the upper groove 3 abuts against the left wall 10, the adjusting block body 1 restricts the counterclockwise rotation of the armrest 8. At this time, the top surface of the armrest is tilted upward from left to right. That is, the top surface of the armrest plate is tilted upward from left to right, and it can only rotate clockwise at this time to prevent the device from rotating too much counterclockwise and causing the angle adjustment block body to rotate too much and become stuck. At this time, the armrest can only be lowered and cannot be adjusted upward.

[0067] See also Fig.11 , 12As shown, when the lower angle tip 12 is against the lower groove 4, the adjusting block body 1 limits the counterclockwise rotation of the armrest 8; at this time, the top surface of the armrest is tilted upward from left to right; at the same time, the lower angle tip wants to rotate toward the upper right, which will give the adjusting block body a counterclockwise rotation force, that is, the right side surface of the lower groove wants to rotate toward the upper left, and the forces between the lower angle tip and the right side surface of the lower groove are opposite, so that if the armrest wants to continue to rotate counterclockwise, it will be blocked by the angle adjustment block body, making it impossible to rotate counterclockwise, that is, the armrest cannot continue to flip to the left, and it can only rotate clockwise to adjust the position.

[0068] See also Figure 1 As shown, a right groove 18 is further provided on the right side of the adjusting block body 1, and the left groove 5 and the right groove 18 are symmetrically arranged on the left and right sides of the mounting hole 2, respectively. In this embodiment, since the left groove is provided, the structure of the adjusting block body is symmetrical and unbalanced. Therefore, by providing the right groove, the adjusting block is more balanced, so that the adjusting block does not rotate as much as possible when it is not subjected to external force.

[0069] See also Figure 1 As shown, the mounting hole 2 passes through the front end face and the rear end face of the adjusting block body 1, and a clearance hole 19 is provided on the front end face of the adjusting block body 1, which is coaxially arranged with the mounting hole 2, and the diameter of the clearance hole 19 is larger than the diameter of the mounting hole 2; in this way, the connecting shaft can directly pass through the mounting hole and connect with the seat, and a head with a larger diameter will be provided at the end of the connecting shaft to limit the adjusting block body and prevent the adjusting block body from falling off the connecting shaft. In order to prevent the head of the connecting shaft from affecting the connection with the armrest, a clearance hole is provided so that the head of the connecting shaft can be received in the clearance hole, so that it will not occupy the axial space and reduce the occupation of the installation space.

[0070] The right side of the left groove is connected to the left side of the clearance hole, and the left side of the right groove is connected to the right side of the clearance hole. Of course, in the present invention, the left groove and the right groove may not be connected to the clearance hole, and the choice is made according to the actual situation. In this embodiment, the left groove and the right groove are connected to the clearance hole, mainly for the convenience of processing.

[0071] See also Figure 1 As shown, the front end faces of the left groove and the right groove are connected to the front end face of the adjusting block body. The rear end faces of the left groove and the right groove can be connected to the rear end face of the adjusting block body, or they can be disconnected. In the figure, the rear end faces of the left groove and the right groove are disconnected from the rear end face of the adjusting block body. Of course, it is best for the left groove and the right groove to be connected to the rear end face of the adjusting block body, which is convenient for processing the adjusting block body.

[0072] The front and rear ends of the upper and lower grooves respectively penetrate the front and rear surfaces of the adjusting block body, which is convenient for processing. At the same time, even if the adjusting block body moves axially relative to the connecting shaft, it will not affect the corresponding corner tip from being inserted into the upper groove, the lower groove or the left groove.

[0073] See also Figures 3 to 12 As shown, the bottom of the handrail 8 is coaxially provided with an inner ring 20, an intermediate ring 21 and an outer ring 22, and the connecting member 9 is inserted in the inner ring 20; wherein, the inner ring, the intermediate ring and the outer ring are arranged on the bottom front side of the connecting plate.

[0074] The bottom surface of the middle ring 21 is provided with an inner notch 23, the inner end of the left side wall 10 is connected to the outer wall of the inner ring 20, the middle part of the left side wall 10 is connected to the left side of the inner notch 23, and the outer end of the left side wall 10 is connected to the inner wall of the outer ring 22;

[0075] A middle plate 24 is also provided, the outer end of the middle plate 24 is connected to the right end of the inner notch 23, the inner end of the middle plate 24 is connected to the outer surface of the inner ring 20, and the connection between the outer end of the middle plate 24 and the middle ring 24 forms the middle angle tip 14;

[0076] The right side wall 11 is disposed on the right side of the middle plate 24 , the inner end of the right side wall 11 is connected to the outer surface of the middle ring 21 , and the outer end of the right side wall 11 is connected to the inner surface of the outer ring 22 ;

[0077] An outer notch 25 is provided on the bottom surface of the outer ring 22. The end of the outer ring 22 at the left end of the outer notch 25 constitutes the lower corner tip 12, and the end of the outer ring at the right end of the outer notch 25 constitutes the upper corner tip 13. The lower corner tip 12 is arranged rearwardly opposite to the middle of the inner notch 23, and the upper corner tip 13 is arranged between the middle plate 24 and the right side wall 11.

[0078] The width between the inner ring and the outer ring is greater than the width of the regulating block body.

[0079] The length of the regulating block body is greater than the width between the inner ring and the outer ring.

[0080] When the lower corner tip abuts against the lower groove, the middle corner tip is arranged opposite to the upper groove, and a distance is provided between the middle corner tip and the upper groove;

[0081] When the lower corner tip abuts against the left groove and the left top of the upper groove abuts against the left wall, the middle corner tip is arranged opposite to the right side surface of the adjustment block body above the mounting hole.

[0082] When the top of the adjusting block body abuts against the right wall, the lower groove is arranged in the outer notch;

[0083] The rotation angle of the adjustment block body in the armrest is less than 180°. The rotation angle of the angle adjustment block is less than 180°, and it cannot be flipped 360°. Compared with the previous structure that can rotate 360°, it can effectively prevent the occurrence of jamming and failure during the 360° rotation process, effectively ensure the stability of its use, and extend its service life.

[0084] In the present invention, the armrest angle adjustment principle and process are as follows (in the initial state, the top surface of the armrest is parallel to the top plane of the seat, and the middle angle tip is against the upper groove):

[0085] 1. As the middle corner tip is against the upper groove, the left side of the middle plate is against the left side of the upper groove, and the outer end of the middle plate is against part of the right side of the upper groove. As the length of the left side of the upper groove is greater than the length of the right side of the upper groove, the middle corner tip needs to rotate toward the lower left, which gives the right side of the upper groove a rotational force toward the upper left. The two are against each other, so that the handrail cannot rotate clockwise. At this time, when the handrail is given downward pressure, the handrail is in a stable state and will not rotate clockwise. See Figure 5 , 6 shown.

[0086] 2. When the armrest needs to be stored, that is, when the armrest is rotated to below the top plane of the seat, give the armrest a counterclockwise push, that is, grab the armrest plate and push it up. At this time, the middle plate rotates toward the upper right, and the middle plate will smoothly detach from the upper groove. In this process, the left wall and the lower corner tip rotate toward the upper right. When the main body of the adjustment block has not rotated yet, the left side of the main body of the adjustment block below the mounting hole is in the outer notch. In this way, when the armrest rotates counterclockwise, the lower corner tip will touch the lower side of the left side of the main body of the adjustment block and push the main body of the adjustment block to rotate counterclockwise. When the lower corner tip rotates to the left groove, The connection between the upper groove and the left side of the adjusting block body will also abut against the left wall. At this time, a triangular structure is formed between the left side of the adjusting block body, the left wall and the lower corner tip. At the same time, the lower corner tip rotates toward the upper right, which gives the adjusting block body a counterclockwise rotation force. At this time, the left wall wants to move to the right, but the top of the adjusting block body has a force to move to the left. The two offset each other, so that the handrail cannot continue to rotate counterclockwise, limiting the counterclockwise rotation of the handrail. At this time, the top surface of the handrail plate is tilted upward from left to right, and the right side surface above the mounting hole is in the inner notch. At this time, the middle corner tip is facing the upper part of the right side surface of the adjusting block body, see Figure 7 , 8 shown.

[0087] 3. Then rotate the armrest clockwise. At this time, the lower corner tip and the left wall are separated from the adjusting block body, and the middle corner tip rotates to the lower left. When it touches the upper right side of the adjusting block body, it pushes the adjusting block body to rotate counterclockwise, so that the right side of the adjusting block body will contact the outer surface of the middle ring. At this time, the adjusting block body is in a tangent state to the outer surface of the middle ring, so that the top of the adjusting block body will face the gap between the upper corner tip and the middle ring. Then, when the armrest continues to rotate clockwise, the adjusting block body enters between the middle ring and the outer ring and approaches the right wall. When the top of the adjusting block body contacts the right wall, the armrest can no longer rotate clockwise, and the top of the armrest is tilted downward from left to right and is in the storage state. The side of the seat is fully opened. See Fig. 9 , 10 shown.

[0088] 4. When the armrest needs to be converted from the storage state to the use state (use state: the top surface of the armrest is parallel to the top plane of the seat and can support the hands), rotate the armrest counterclockwise, because the lower corner tip is now facing the right side surface of the lower groove; when the main body of the adjustment block is completely out of between the middle ring and the outer ring, the armrest can still drive the main body of the adjustment block to rotate counterclockwise, and the lower corner tip will be completely facing the lower groove. After the lower corner tip contacts the lower groove, first push the main body of the adjustment block to rotate counterclockwise. When the inner surface of the lower corner tip is completely in contact with the left side surface of the lower groove, the lower corner tip will rotate toward the upper right, and the left side surface of the lower groove will rotate toward the lower left. The two are limited, so that the armrest cannot rotate counterclockwise. At this time, the top surface of the armrest is tilted upward from left to right, and its top surface is above the top plane of the seat. At the same time, the upper groove will face the middle corner tip, and there is a distance between the two. See Fig.11 , 12 shown.

[0089] 5. Then the armrest rotates clockwise. At this time, the lower corner tip moves toward the lower left, so that it can smoothly detach from the lower groove. The middle corner tip moves toward the lower left and enters the upper groove. When the middle corner tip touches the right side of the upper groove, the middle corner tip wants to continue to move downward, but the right side of the upper groove pushed by it receives the thrust of the middle corner tip and moves upward, so the two conflict with each other, and the armrest cannot continue to rotate clockwise. At this time, the top surface of the armrest is parallel to the top plane of the seat, and can support the hand. See Figure 5 , 6 shown.

[0090] In the utility model, the rotation angle of the regulating block body is less than 180°, which can effectively prevent the occurrence of the stuck phenomenon, ensure the stability of use and service life, and reduce the maintenance rate.

[0091] At the same time, during assembly, since the main body of the adjustment block is not 360° rotatable, it is easy to assemble.

[0092] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0093] In the present utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral one; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, for example, the two can form a mechanical abutment or abutment connection through abutment, contact, etc., the two can also be directly hung or hung through an intermediate medium, etc., or it can be the internal connection of the two elements or the interaction relationship between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An angle adjustment block, characterized in that: It comprises an adjusting block body, wherein a mounting hole is provided at the center of the adjusting block body; The top and bottom of the adjusting block body are respectively provided with an upper groove and a lower groove, and the left side of the adjusting block body is provided with a left groove; The upper groove is a V-shaped structure with an open top, and the right end of the left side of the upper groove is connected to the left end of the right side of the upper groove; The lower groove is a V-shaped structure with an open bottom, and the right end of the left side surface of the lower groove is connected to the left end of the right side surface of the lower groove.

2. The angle adjustment block according to claim 1, characterized in that: A right groove is also provided on the right side of the adjusting block body, and the left groove and the right groove are symmetrically arranged on the left side and the right side of the mounting hole respectively.

3. The angle adjustment block according to claim 2, characterized in that: The mounting hole passes through the front end face and the rear end face of the adjusting block body, and a clearance hole coaxially arranged with the mounting hole is provided on the front end face of the adjusting block body, and the diameter of the clearance hole is larger than the diameter of the mounting hole; And / or, the right side of the left groove is connected to the left side of the clearance hole, and the left side of the right groove is connected to the right side of the clearance hole; And / or, the front end surfaces of the left groove and the right groove are connected to the front end surface of the adjustment block body.

4. The angle adjustment block according to claim 1, characterized in that: The top ends of the upper groove are respectively connected to the tops of the left side and right side of the adjusting block body through arc surfaces; The arc-shaped surfaces at both ends of the bottom of the lower groove are connected to the bottom of the left side and the right side of the adjusting block body; And / or, the front ends and rear ends of the upper groove and the lower groove respectively penetrate the front end surface and the rear end surface of the adjustment block body.

5. An angle-adjustable chair armrest structure, comprising an armrest rotatably connected to a chair, wherein the bottom of the armrest is rotatably connected to the chair via a connecting member, and characterized in that: The handrail outside the connecting piece is provided with a left wall, a right wall, a lower corner tip, an upper corner tip and a middle corner tip; It also includes the angle adjustment block as claimed in any one of claims 1 to 4, wherein the adjustment block body is rotatably connected to the seat through a connecting shaft passing through the mounting hole, the connecting shaft is arranged at the lower right side of the connecting member, and the adjustment block body is rotatably arranged between the left wall and the right wall; When the middle angle tip abuts against the upper groove, the adjusting block body restricts the clockwise rotation of the armrest; When the top of the adjusting block body abuts against the right wall, the adjusting block body restricts the clockwise rotation of the armrest; When the lower corner tip abuts against the lower groove, the adjusting block body restricts the armrest from rotating counterclockwise; When the lower corner tip abuts against the left groove and the left top of the upper groove abuts against the left wall, the adjusting block body restricts the armrest from rotating counterclockwise.

6. The angle-adjustable chair armrest structure according to claim 5, characterized in that: The bottom of the handrail is coaxially provided with an inner ring, an intermediate ring and an outer ring, and the connecting piece is inserted in the inner ring; The middle ring is provided with an inner notch, the inner end of the left wall is connected to the outer wall of the inner ring, the middle of the left wall is connected to the left side of the inner notch, and the outer end of the left wall is connected to the inner wall of the outer ring; A middle plate is also provided, the outer end of the middle plate is connected to the right end of the inner notch, the inner end of the middle plate is connected to the outer surface of the inner ring, and the connection between the outer end of the middle plate and the middle ring forms the middle angle tip; The right side wall is arranged on the right side of the middle plate, the inner end of the right side wall is connected to the outer surface of the middle ring, and the outer end of the right side wall is connected to the inner surface of the outer ring; An outer notch is provided on the outer ring, the outer ring end at the left end of the outer notch constitutes the lower corner tip, the outer ring end at the right end of the outer notch constitutes the upper corner tip, the lower corner tip is arranged rearwardly opposite to the middle of the inner notch, and the upper corner tip is arranged between the middle plate and the right side wall.

7. The angle-adjustable chair armrest structure according to claim 6, characterized in that: The width between the inner ring and the outer ring is greater than the width of the regulating block body; And / or, the length of the regulating block body is greater than the width between the inner ring and the outer ring.

8. The angle-adjustable chair armrest structure according to claim 5, characterized in that: When the lower corner tip abuts against the lower groove, the middle corner tip is arranged opposite to the upper groove, and a distance is provided between the middle corner tip and the upper groove; And / or, when the lower corner tip abuts against the left groove and the left top of the upper groove abuts against the left wall, the middle corner tip is arranged opposite to the right side surface of the adjustment block body above the mounting hole.

9. The angle-adjustable chair armrest structure according to claim 6, characterized in that: When the top of the adjusting block body abuts against the right wall, the lower groove is arranged in the outer notch; And / or, the rotation angle of the adjustment block body in the armrest is less than 180°.

10. The angle-adjustable chair armrest structure according to claim 5, characterized in that: When the middle angle tip abuts against the upper groove, the angle between the top plane of the armrest and the top plane of the seat is 0° to 5°; And / or, when the top of the adjusting block body abuts against the right wall, the top surface of the handrail is arranged to tilt downward from left to right; and / or, when the lower corner tip abuts against the lower groove, the top surface of the handrail is arranged to tilt upward from left to right; And / or, when the lower corner tip abuts against the left groove and the left top of the upper groove abuts against the left wall, the top surface of the handrail is arranged to tilt upward from left to right.

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