Office chair headrest structure with multi-dimension adjustment and office chair

Abstract

The utility model provides a kind of office chair headrest structure and office chair with multidimensional adjustment, office chair headrest structure with multidimensional adjustment, comprising: headrest mounting seat, lifting seat, first rotating seat, front and back buffer seat, front and back adjusting seat, second rotating seat and lifting headrest, lifting seat is set on headrest mounting seat with lifting;Rotating seat is rotatably set on lifting seat;Front and back buffer seat can move front and back relative rotating seat, and a plurality of buffer elastic members are arranged between front and back buffer seat and first rotating seat;Front and back adjusting seat can move front and back relative front and back buffer seat;Second rotating seat is rotatably set on front and back adjusting seat;Lifting headrest is set on second rotating seat with lifting.The utility model's office chair headrest structure with multidimensional adjustment can realize position adjustment on six dimensions, can greatly range adapt the support demand of human head, and user experience is better;Overall structure design is ingenious, and it is convenient for user to use.

Description

Technical Field

[0001] This utility model relates to the field of office chair technology, specifically to an office chair headrest structure with multi-dimensional adjustment and an office chair. Background Technology

[0002] Office chairs refer to various types of chairs provided for convenience during daily work and social activities. Since sitting in office chairs for extended periods can easily lead to many adverse health effects, and significantly increases the risk of cervical spondylosis, headrests are typically included in these chairs to facilitate rest and relaxation for office workers.

[0003] Office chairs typically consist of a base, seat, backrest, backrest, and headrest. The base usually has multiple casters to facilitate the movement of the office chair. The seat is fixed to the base for the user to sit on. The backrest is located at the back of the seat, and the backrest is installed on the seat to support the user's back. The headrest is installed on the backrest to support the user's head.

[0004] To accommodate the heads of people of different body types, headrest structures are usually designed to be able to rise, fall, and rotate. However, since people of different body types have different needs for head support, and people's needs for headrest support may also vary in different application scenarios, the current headrest structure only has one direction of rise and fall and one direction of rotation, that is, it is only adjustable in two dimensions, which is difficult to meet the head support needs of people. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies in the existing technology and to provide an office chair headrest structure and office chair with multi-dimensional adjustment.

[0006] One embodiment of this utility model provides an office chair headrest structure with multi-dimensional adjustment, comprising: Headrest mounting bracket for mounting to the back of an office chair; A lifting seat, wherein the lifting seat is movably mounted on the headrest mounting base; A first rotating seat, the rotating seat being rotatably mounted on the lifting seat; Front and rear buffer seats are movably mounted on the rotating seat and can move back and forth relative to the rotating seat. A plurality of buffer elastic elements are provided between the front and rear buffer seats and the first rotating seat. A front-to-back adjustment seat is movably connected to a front-to-back buffer seat, and the front-to-back adjustment seat can move back and forth relative to the front-to-back buffer seat; The second rotating seat is rotatably mounted on the front and rear adjusting seat; A height-adjustable headrest is mounted on the second rotating seat in a height-adjustable manner.

[0007] In some alternative embodiments, the headrest mounting base is provided with a snap-fit ​​groove for detachably engaging with the backrest of an office chair.

[0008] In some optional embodiments, the lifting seat is provided with a first slide groove and a plurality of first ratchet grooves. The upper and lower ends of the first slide groove are respectively provided with an upper guide portion and a lower guide portion. The plurality of first ratchet grooves are arranged on one side of the first slide groove and are arranged sequentially from the upper guide portion to the lower guide portion. The lower guide portion gradually extends in an inclined direction away from the upper guide portion and away from the first ratchet groove. The headrest mounting base is provided with a first limiting groove, a first rotating groove, a first pawl and a first pressing elastic element. The first limiting groove and the first rotating groove are connected to each other and are arranged sequentially in the direction close to the first ratchet groove. The first pawl is rotatably mounted on the headrest mounting base. The first pressing elastic element is connected to the first pawl and its elastic force is directed towards the first ratchet groove. The first pawl is provided with a first sliding part and a first rotating part. The first sliding part is slidably engaged with the first sliding groove, and the first rotating part is rotatably engaged with the first rotating groove or the first limiting groove. The first rotating part can move back and forth between the first limiting groove and the first rotating groove. When the first rotating part is located in the first rotating groove, the first pawl is pressed against the first ratchet groove under the drive of the first clamping elastic member. The first pawl and the first ratchet groove are positioned and engaged so that the lifting seat can only rise relative to the headrest mounting seat. The lower guide portion can guide the first sliding portion to move to drive the first pawl to move, thereby causing the first rotating portion of the first pawl to enter the first limiting groove from the first rotating groove. When the first rotating part is located in the first limiting groove, the first pawl disengages from the first ratchet groove; The upper guide portion can guide the first sliding portion to move in order to drive the first pawl to move, thereby causing the first rotating portion of the first pawl to enter the first rotating groove from the first limiting groove.

[0009] In some optional embodiments, the lifting seat is provided with a plurality of first damping teeth, the first rotating seat is provided with a rotating shaft, the rotating shaft is rotatably engaged with the lifting seat, and the outer periphery of the rotating shaft is provided with a plurality of second damping teeth, the first damping teeth meshing with the second damping teeth.

[0010] In some optional embodiments, the front and rear buffer seats are provided with a movable cavity, the movable cavity having a guide groove that communicates with the outside of the front and rear buffer seats; The first rotating seat is provided with a sliding support part, which is movably disposed in the movable cavity. A portion of the sliding support part is slidably engaged with the guide groove. The buffer elastic element is disposed in the movable cavity and connected to the sliding support part.

[0011] In some optional embodiments, the front and rear adjustment seat is provided with a second slide groove and a plurality of second ratchet grooves. The front and rear ends of the second slide groove are respectively provided with a front guide portion and a rear guide portion. The plurality of second ratchet grooves are arranged on one side of the second slide groove and are arranged sequentially from the front guide portion to the rear guide portion. The rear guide portion gradually extends in an inclined direction away from the front guide portion and away from the second ratchet groove. The front and rear buffer seats are provided with a second limiting groove, a second rotating groove, a second pawl, and a second pressing elastic element. The second limiting groove and the second rotating groove are connected to each other and are arranged sequentially in the direction close to the second ratchet groove. The second pawl is rotatably mounted on the front and rear buffer seats. The second pressing elastic element is connected to the second pawl, and its elastic force is directed towards the second ratchet groove. The second pawl is provided with a second sliding part and a second rotating part. The second sliding part is slidably engaged with the second sliding groove, and the second rotating part is rotatably engaged with the second rotating groove or the second limiting groove. The second rotating part can move back and forth between the second limiting groove and the second rotating groove. When the second rotating part is located in the second rotating groove, the second pawl is pressed against the second ratchet groove under the drive of the second clamping elastic member. The second pawl and the second ratchet groove are positioned and engaged so that the front and rear adjusting seat can only move relative to the front and rear buffer seat in the direction from the rear guide part to the second pawl. The rear guide portion can guide the second sliding portion to move to drive the second pawl to move, thereby causing the second rotating portion of the second pawl to enter the second limiting groove from the second rotating groove. When the second rotating part is located in the second limiting groove, the second pawl disengages from the second ratchet groove; The front guide portion can guide the second sliding portion to move in order to drive the second pawl to move, thereby causing the second rotating portion of the second pawl to enter the second rotating groove from the second limiting groove.

[0012] In some alternative embodiments, the second rotating seat is rotatably engaged with the front and rear adjusting seats via a damping shaft structure.

[0013] In some optional embodiments, the lifting headrest is provided with a lifting through groove, and a plurality of positioning tooth grooves are arranged sequentially from top to bottom in the lifting through groove. A portion of the second rotating seat passes through the lifting through groove, and a plurality of positioning teeth are provided on the second rotating seat, the positioning teeth being positioned and engaged with the positioning tooth grooves.

[0014] In some optional embodiments, the lifting channel is further provided with a plurality of positioning grooves arranged sequentially from top to bottom, and the second rotating seat is provided with a positioning ball structure, which is positioned and engaged with the positioning groove.

[0015] Another embodiment of this utility model provides an office chair, including: an office chair headrest structure with multi-dimensional adjustment as described above.

[0016] Compared to existing technologies, the multi-dimensional adjustable office chair headrest structure of this invention can achieve positional adjustment in six dimensions, which can adapt to the support needs of the human head to a great extent, resulting in a better user experience. The overall structure is cleverly designed, which can well realize the positioning of each structure, so that the position of the adjustable headrest remains stable and convenient for users.

[0017] To provide a clearer understanding of this invention, the specific embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a multi-dimensional adjustable office chair headrest structure according to an embodiment of the present invention. Figure 2 An exploded view of an office chair headrest structure with multi-dimensional adjustment according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the headrest structure and backrest structure of an office chair with multi-dimensional adjustment according to an embodiment of the present invention. Figure 4 This is a partial structure of the headrest mounting base according to an embodiment of the present utility model, and an exploded view of the headrest mounting base; Figure 5 This is a schematic diagram of the structure of the first pressing block according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the first pawl and the first clamping elastic element according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a portion of the structure of the headrest mounting base and the lifting base according to an embodiment of the present utility model; Figure 8This is an exploded view of the lifting seat and the first rotating seat according to an embodiment of the present invention; Figure 9 This is a cross-sectional view of a first rotating seat, front and rear buffer seats, and front and rear adjusting seats according to an embodiment of the present invention. Figure 10 This is an exploded view of the front and rear buffer seats and the front and rear adjustment seats according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the front and rear buffer seats and the front and rear adjustment seats according to an embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of the second rotating seat according to an embodiment of the present invention; Figure 13 This is a schematic diagram of a portion of the structure of a lifting headrest according to an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 10. Headrest mounting base; 11. Snap-fit ​​groove; 12. Hanging rod structure; 13. First limiting groove; 14. First rotating groove; 15. First pawl; 151. First sliding part; 152. First rotating part; 153. First clearance groove; 16. First clamping elastic element; 17. First pressure block; 20. Lifting seat; 21. First sliding groove; 211. Upper guide part; 212. Lower guide part; 22. First ratchet groove; 23. Front shell; 24. Rear shell; 25. First through groove; 26. First damping tooth part; 30. First rotating seat; 31. Rotating shaft part; 32. Second damping tooth part; 33. 40. Sliding support; 41. Front and rear buffer seats; 42. Buffer elastic element; 43. Movable cavity; 44. Guide groove; 45. Second pawl; 46. Second clamping elastic element; 57. Second pressure block; 58. Front and rear adjustment seat; 59. Second groove; 50. Front guide part; 51. Rear guide part; 52. Second ratchet groove; 53. Lower shell; 54. Upper shell; 55. Second through groove; 60. Second rotating seat; 61. Damping shaft structure; 62. Positioning tooth part; 63. Positioning ball structure; 70. Lifting headrest; 71. Lifting through groove; 72. Positioning tooth groove; 73. Positioning groove. Detailed Implementation

[0020] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments thereof. Please refer to... Figures 1 to 3 One embodiment of this utility model provides an office chair headrest structure with multi-dimensional adjustment, comprising: Headrest mounting bracket 10 is used for mounting to the back of an office chair.

[0021] The lifting seat 20 is mounted on the headrest mounting seat 10 in a height-adjustable manner.

[0022] The first rotating seat 30 is rotatably mounted on the lifting seat.

[0023] The front and rear buffer seats 40 are movably mounted on the rotating seat and can move back and forth relative to the rotating seat. Several buffer elastic elements 41 are provided between the front and rear buffer seats 40 and the first rotating seat 30.

[0024] The front and rear adjustment seat 50 is movably connected to the front and rear buffer seat 40, and the front and rear adjustment seat 50 can move back and forth relative to the front and rear buffer seat 40.

[0025] The second rotating seat 60 is rotatably mounted on the front and rear adjusting seat 50.

[0026] The adjustable headrest 70 is mounted on the second rotating seat 60 in a height-adjustable manner.

[0027] The working principle of a multi-dimensional adjustable office chair headrest structure according to an embodiment of this utility model is explained below: The headrest mounting base 10 is assembled and fixed to the backrest of the office chair, thereby realizing the assembly of the office chair headrest structure with multi-dimensional adjustment.

[0028] The lifting seat 20 can be raised and lowered relative to the headrest mounting seat 10, thereby adjusting the height of the first rotating seat 30, the front and rear buffer seat 40, the front and rear adjusting seat 50, the second rotating seat 60 and the lifting headrest 70, so as to realize the position adjustment of the lifting headrest 70 in the first dimension; The first rotating seat 30 can rotate relative to the lifting seat 20, thereby adjusting the angles of the first rotating seat 30, the front and rear buffer seats 40, the front and rear adjusting seats 50, the second rotating seat 60 and the lifting headrest 70 relative to the lifting seat 20, so as to realize the position adjustment of the lifting headrest 70 in the second dimension; The front and rear buffer seats 40 can move back and forth relative to the first rotating seat 30. When the user's head rests on the lifting headrest 70, the lifting headrest 70 moves backward due to the pressure of the user's head, which in turn drives the front and rear buffer seats 40, the front and rear adjustment seats 50, and the second rotating seat 60 to move backward together, thus adapting to the user's head position. At this time, the buffer elastic element 41 will be compressed or stretched by the front and rear buffer seats 40 and produce elastic deformation. The elastic force of the buffer elastic element 41 is forward, and its elastic force acts on the front and rear buffer seats 40, so that the lifting headrest 70 is also indirectly affected by the elastic force of the buffer elastic element 41 and is pressed tightly against the user's head. By adjusting the front and rear positions of the front and rear buffer seats 40, the front and rear adjustment seats 50, the second rotating seat 60, and the lifting headrest 70, the position adjustment of the lifting headrest 70 in the third dimension can be achieved.

[0029] The front-to-back adjustment seat 50 can move back and forth relative to the front-to-back buffer seat 40, thereby adjusting the front-to-back distance between the front-to-back adjustment seat 50, the second rotating seat 60, and the lifting headrest 70 relative to the front-to-back buffer seat 40, and realizing the position adjustment of the lifting headrest 70 in the fourth dimension. Among them, the position adjustment of the front-to-back adjustment seat 50 is an active position adjustment, while the front-to-back adjustment of the front-to-back buffer seat 40 is an adaptive passive position adjustment.

[0030] The second rotating seat 60 can rotate relative to the lifting seat 20, thereby adjusting the angle between the second rotating seat 60 and the lifting headrest 70 relative to the front and rear adjustment seat 50, so as to realize the position adjustment of the lifting headrest 70 in the fifth dimension.

[0031] The adjustable headrest 70 can be raised and lowered relative to the second rotating seat 60, thereby adjusting the height of the adjustable headrest 70 relative to the second rotating seat 60 and realizing the position adjustment of the adjustable headrest 70 in the sixth dimension.

[0032] As can be seen, through the cooperation of various structures, the adjustable headrest 70 can achieve positional adjustment in six dimensions, which can adapt to the support needs of the human head to a great extent, resulting in a better user experience.

[0033] The specific structure of the headrest mounting base 10 can be designed according to actual needs. For example, in some optional embodiments, the headrest mounting base 10 is provided with a snap-fit ​​groove 11 for detachable engagement with the backrest of the office chair. The snap-fit ​​groove 11 snaps onto the frame of the backrest, thereby achieving a quick assembly method. Of course, in other embodiments, the headrest mounting base 10 can also be detachably connected to the backrest of the office chair using screws or other suitable structures. In this embodiment, the headrest mounting base 10 is also provided with a hanging rod structure 12 for hanging clothing.

[0034] Please see Figures 4 to 7 In some optional embodiments, the lifting seat 20 is provided with a first slide groove 21 and a plurality of first ratchet grooves 22. The upper and lower ends of the first slide groove are respectively provided with an upper guide portion 211 and a lower guide portion 212. The plurality of first ratchet grooves 22 are arranged on one side of the first slide groove 21 and are arranged sequentially from the upper guide portion 211 to the lower guide portion 212. The lower guide portion 212 gradually extends at an angle away from the upper guide portion 211 and away from the first ratchet grooves 22. The headrest mounting base 10 is provided with a first limiting groove 13, a first rotating groove 14, a first pawl 15 and a first pressing elastic element 16. The first limiting groove 13 and the first rotating groove 14 are connected to each other and are arranged sequentially in the direction close to the first ratchet groove 22. The first pawl 15 is rotatably mounted on the headrest mounting base 10. The first pressing elastic element 16 is connected to the first pawl 15 and its elastic force is directed towards the first ratchet groove 22. The first pawl 15 is provided with a first sliding part 151 and a first rotating part 152. The first sliding part 151 is slidably engaged with the first sliding groove 21, and the first rotating part 152 is rotatably engaged with the first rotating groove 14 or the first limiting groove 13. The first rotating part 152 can move back and forth between the first limiting groove 13 and the first rotating groove 14. When the first rotating part 152 is located in the first rotating groove 14, the first pawl 15 is pressed against the first ratchet groove 22 under the drive of the first clamping elastic member 16. The first pawl 15 and the first ratchet groove 22 are positioned and engaged so that the lifting seat 20 can only rise relative to the headrest mounting seat 10. When the lifting seat 20 rises to the appropriate position, the first pawl 15 and the corresponding first ratchet groove 22 are positioned and engaged, so that the lifting seat 20 is positioned in the appropriate position, which is convenient to operate. Since the first pawl 15 and the corresponding first ratchet groove 22 are positioned and engaged, the lifting seat 20 can also be prevented from falling due to the weight of the lifting seat 20 or the weight from the user, and the positioning is stable. The lower guide 212 can guide the first sliding part 151 to move to drive the first pawl 15 to move, thereby causing the first rotating part 152 of the first pawl 15 to enter the first limiting groove 13 from the first rotating groove 14. Specifically, when the lifting seat 20 rises to the limit position, the first sliding part 151 of the first pawl 15 will abut against the lower guide 212. As the lifting seat 20 rises, the first sliding part 151 moves under the guidance of the lower guide 212, causing the first pawl 15 to disengage from the first ratchet groove 22 and causing the first rotating part 152 to disengage from the first rotating groove 14. The first pawl 15 is also subjected to the elastic force of the first pressing elastic member 16, so the first rotating part 152 will enter the first limiting groove 13, thereby realizing the movement of the first rotating part 152 from the first rotating groove 14 to the first limiting groove 13. When the first rotating part 152 is located in the first limiting groove 13, the first pawl 15 disengages from the first ratchet groove 22. Since the first limiting groove 13 restricts the first pawl 15 from moving toward the first ratchet groove 22 due to the elastic force of the first pressing elastic member 16, the first pawl 15 and the first ratchet groove 22 separate from each other. Since the positioning cooperation between the first pawl 15 and the first ratchet groove 22 is lost, the lifting seat 20 can descend so that the lifting seat 20 can return to the lowest point within its stroke range. The upper guide portion 211 can guide the first sliding portion 151 to move, thereby driving the first pawl 15 to move. This causes the first rotating portion 152 of the first pawl 15 to enter the first rotating groove 14 from the first limiting groove 13. Specifically, when the lifting seat 20 descends to its lowest point within its travel range, the first sliding portion 151 of the first pawl 15 abuts against the upper guide portion 211, and moves under the guidance of the upper guide portion 211, causing the first pawl 15 to move. At this time, the first rotating portion 152 will disengage from the first limiting groove 13 and, under the elastic force of the first pressing elastic member 16, will move towards the first ratchet groove 22. The first rotating portion 152 will then move into the first rotating groove 14, and the first pawl 15, under the action of the first pressing elastic member 16, will again engage with one of the first ratchet grooves 22. At this point, the lifting seat 20 can again adjust its height gradually from its lowest point within its travel range.

[0035] The cooperation between the first pawl 15 and the first ratchet groove 22 enables the lifting seat 20 to withstand greater gravity and makes the positioning of the lifting seat 20 more stable.

[0036] Since the lifting seat 20 can be adjusted upwards in stages, when the position to be adjusted is lower than the current position, the lifting seat 20 needs to be raised to the highest position, then returned to the lowest position, and finally raised to the position to be adjusted.

[0037] In this embodiment, the first pawl 15 is provided with a first clearance groove 153, and the headrest mounting base 10 is provided with a shaft that rotates with the first clearance groove 153. When the first pawl 15 moves, the shaft can move relative to the first clearance groove 153, thereby avoiding structural interference.

[0038] In this embodiment, the lifting seat 20 includes a front shell 23 and a rear shell 24 that are detachably connected to each other. A first through groove 25 is provided on the front shell 23. A first pressure block 17 is detachably installed on the headrest mounting seat 10. The first pressure block 17 can be locked by screws or a snap-fit ​​structure. The first pressure block 17 slides with the first through groove 25. The first pressure block 17 is also located between the front shell 23 and the rear shell 24, and restricts the front shell 23 on the headrest mounting seat 10, thereby realizing the assembly of the lifting seat 20. A first pawl 15 and a first clamping elastic element 16 are provided on the first pressure block 17. A first sliding groove 21 and a first ratchet groove 22 are provided on the front shell 23.

[0039] Please see Figure 8In some optional embodiments, the lifting seat 20 is provided with a plurality of first damping teeth 26, and the first rotating seat 30 is provided with a rotating shaft 31. The rotating shaft 31 is rotatably engaged with the lifting seat 20. A plurality of second damping teeth 32 are provided on the outer periphery of the rotating shaft 31. The first damping teeth 26 and the second damping teeth 32 mesh. After the first rotating seat 30 rotates relative to the lifting seat 20, the first rotating seat 30 can be suspended at a suitable angle relative to the lifting seat 20 through the positioning engagement of the first damping teeth 26 and the corresponding second damping teeth 32, which is convenient for operation.

[0040] Please see Figure 9 In some optional embodiments, the front and rear buffer seats 40 are provided with a movable cavity 42, the movable cavity 42 has a guide groove 43, the guide groove 43 communicates with the outside of the front and rear buffer seats 40; a sliding support part 33 is provided on the first rotating seat 30, the sliding support part 33 is movably disposed in the movable cavity 42, part of the sliding support part 33 slides with the guide groove 43, the buffer elastic element 41 is disposed in the movable cavity 42 and connected to the sliding support part 33, the cooperation of the movable cavity 42 and the guide groove 43 guides the movement of the sliding support part 33, so that the front and rear buffer seats 40 can move more stably, and the movable cavity 42 is also conducive to the stable assembly of the buffer elastic element 41.

[0041] Please see Figures 10 to 11 In some optional embodiments, the front and rear adjustment seat 50 is provided with a second slide groove 51 and a plurality of second ratchet grooves 52. The front and rear ends of the second slide groove are respectively provided with a front guide portion 511 and a rear guide portion 512. The plurality of second ratchet grooves 52 are arranged on one side of the second slide groove 51 and are arranged sequentially from the front guide portion 511 to the rear guide portion 512. The rear guide portion 512 gradually extends at an angle away from the front guide portion 511 and away from the second ratchet grooves 52. The front and rear buffer seats 40 are provided with a second limiting groove, a second rotating groove, a second pawl 44 and a second pressing elastic member 45. The second limiting groove and the second rotating groove are connected to each other and are arranged in sequence in the direction close to the second ratchet groove 52. The second pawl 44 is rotatably mounted on the front and rear buffer seats 40. The second pressing elastic member 45 is connected to the second pawl 44 and its elastic force is directed towards the second ratchet groove 52. The second pawl 44 is provided with a second sliding part and a second rotating part. The second sliding part is slidably engaged with the second sliding groove 51, and the second rotating part is rotatably engaged with the second rotating groove or the second limiting groove. The second rotating part can move back and forth between the second limiting groove and the second rotating groove. The front-to-back position adjustment method of the front-to-back adjustment seat 50 relative to the front-to-back buffer seat 40 can refer to the lifting position adjustment method of the lifting seat 20 relative to the headrest mounting seat 10. The structure of the second pawl 44 can refer to the structure of the first pawl 15. The structure of the second rotating groove can refer to the structure of the first rotating groove 14. The structure of the second limiting groove can refer to the structure of the first limiting groove 13. Therefore, detailed illustrations are not provided here. When the second rotating part is located in the second rotating groove, the second pawl 44 is pressed against the second ratchet groove 52 under the drive of the second clamping elastic member 45. The second pawl 44 and the second ratchet groove 52 are positioned and engaged so that the front and rear adjusting seat 50 can only move forward relative to the front and rear buffer seats 40. When the front and rear adjusting seat 50 moves forward to the appropriate position, the second pawl 44 and the corresponding second ratchet groove 52 are positioned and engaged, so that the front and rear adjusting seat 50 is positioned in the appropriate position, which is convenient to operate. Since the second pawl 44 and the corresponding second ratchet groove 52 are positioned and engaged, the front and rear adjusting seat 50 can also be prevented from moving backward due to the weight of the front and rear adjusting seat 50 or the weight from the user, and the positioning is stable. The rear guide 512 can guide the second sliding part to move to drive the second pawl 44 to move, thereby causing the second rotating part of the second pawl 44 to enter the second limiting groove from the second rotating groove. Specifically, when the front and rear adjustment seat 50 moves forward to the limit position, the second sliding part of the second pawl 44 will abut against the rear guide 512. As the front and rear adjustment seat 50 moves forward, the second sliding part moves under the guidance of the rear guide 512, causing the second pawl 44 to disengage from the second ratchet groove 52 and causing the second rotating part to disengage from the second rotating groove. The second pawl 44 is also subjected to the elastic force of the second clamping elastic member 45, so the second rotating part will enter the second limiting groove, thereby realizing the movement of the second rotating part from the second rotating groove to the second limiting groove. When the second rotating part is located in the second limiting groove, the second pawl 44 disengages from the second ratchet groove 52. Since the second limiting groove restricts the second pawl 44 from moving toward the second ratchet groove 52 due to the elastic force of the second clamping elastic member 45, the second pawl 44 and the second ratchet groove 52 separate from each other. Since the positioning engagement of the second pawl 44 and the second ratchet groove 52 is lost, the front and rear adjustment seat 50 can move backward so that the front and rear adjustment seat 50 can return to the end of its stroke range. The front guide 511 can guide the second sliding part to move, thereby driving the second pawl 44 to move. This causes the second rotating part of the second pawl 44 to enter the second rotating groove from the second limiting groove. Specifically, when the front / rear adjustment seat 50 moves backward to the end of its travel range, the second sliding part of the second pawl 44 abuts against the front guide 511, and the second sliding part moves under the guidance of the front guide 511, causing the second pawl 44 to move. At this time, the second rotating part will disengage from the second limiting groove and, under the elastic force of the second pressing elastic member 45, will move the second pawl 44 towards the second ratchet groove 52. The second rotating part will then move into the second rotating groove, and under the action of the second pressing elastic member 45, the second pawl 44 will again engage with one of the second ratchet grooves 52. At this point, the front / rear adjustment seat 50 can again adjust its height step by step from the end of its travel range.

[0042] The cooperation of the second pawl 44 and the second ratchet groove 52 enables the front and rear adjustment seat 50 to withstand greater gravity and makes the positioning of the front and rear adjustment seat 50 more stable.

[0043] Since the front and rear adjustment seat 50 can achieve unidirectional step-by-step adjustment, when the position to be adjusted is behind the current position, the front and rear adjustment seat 50 needs to be moved forward to the foremost position, then returned to the last position, and finally moved forward again to the position to be adjusted.

[0044] The specific structure of the buffer elastic element 41, the first pressing elastic element 16 and the second pressing elastic element 45 can be designed according to actual needs. For example, the buffer elastic element 41, the first pressing elastic element 16 and the second pressing elastic element 45 can adopt the structure of spring, sheet, etc.

[0045] In this embodiment, the second pawl 44 is provided with a second clearance groove, and the front and rear buffer seats 40 are provided with a shaft that rotates with the second clearance groove. When the second pawl 44 moves, the shaft can move relative to the second clearance groove, thereby avoiding structural interference.

[0046] In this embodiment, the front and rear adjustment seat 50 includes a lower shell 53 and an upper shell 54 that are detachably connected to each other. The lower shell 53 is provided with a second through groove 55, and the front and rear buffer seat 40 is provided with a second pressing block 46. The second pressing block 46 is slidably engaged with the second through groove 55. The second pressing block 46 is also located between the lower shell 53 and the upper shell 54, and restricts the lower shell 53 on the front and rear buffer seat 40, thereby realizing the assembly of the front and rear adjustment seat 50. The second pawl 44 and the second clamping elastic member 45 are provided on the second pressing block 46, and the second sliding groove 51 and the second ratchet groove 52 are provided on the lower shell 53.

[0047] Please see Figure 12In some optional embodiments, the second rotating seat 60 is rotatably engaged with the front and rear adjusting seat 50 via a damping shaft structure 61. The damping shaft allows the second rotating seat 60 to remain suspended after rotating relative to the front and rear adjusting seat 50 to a suitable position. The damping shaft structure 61 can be the damping structure on the rotating shaft portion 31 of the first rotating seat 30. Of course, other suitable structures can also be used. The principles and structures of other damping shaft structures 61 are well known to those skilled in the art and will not be described in detail here.

[0048] Please see Figure 13 In some optional embodiments, the adjustable headrest 70 is provided with an adjustable groove 71, and multiple positioning slots 72 arranged sequentially from top to bottom are provided in the adjustable groove 71. A portion of the second rotating seat 60 passes through the adjustable groove 71, and the second rotating seat 60 is provided with a number of positioning teeth 62. The positioning teeth 62 are positioned and engaged with the positioning slots 72. When the adjustable headrest 70 moves up and down relative to the second rotating seat 60, the adjustable groove 71 and the second rotating seat 60 cooperate to achieve a guiding effect, improving the positional stability of the adjustable headrest 70. The positioning teeth plate is positioned and engaged with the corresponding positioning slots 72, thereby positioning the adjustable headrest 70 at a suitable height. The positioning slots 72 can be arranged in multiple rows, with multiple positioning slots 72 in each row, and the number of positioning teeth 62 is increased accordingly so that the positioning teeth 62 can engage with each row of positioning slots 72.

[0049] In some optional embodiments, the lifting channel 71 is further provided with a plurality of positioning grooves 73 arranged sequentially from top to bottom. The second rotating seat 60 is provided with a positioning ball structure 63, which engages with the positioning grooves 73. The elastic force of the positioning ball structure 63 presses it firmly into the positioning groove 73, improving positioning stability. When the lifting headrest 70 is positioned at a suitable height, the positioning ball structure 63 engages with the corresponding positioning groove 73. The principle and structure of the positioning ball structure 63 are well known to those skilled in the art and will not be described in detail here. The aforementioned multi-dimensional adjustable office chair headrest structure can be applied to office chairs, which include: the aforementioned multi-dimensional adjustable office chair headrest structure.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A headrest structure for an office chair with multi-dimensional adjustability, characterized in that, include: A headrest mounting bracket for mounting to the back of an office chair; A lifting seat, wherein the lifting seat is movably mounted on the headrest mounting base; A first rotating seat, the rotating seat being rotatably mounted on the lifting seat; Front and rear buffer seats are movably mounted on the rotating seat and can move back and forth relative to the rotating seat. A plurality of buffer elastic elements are provided between the front and rear buffer seats and the first rotating seat. A front-to-back adjustment seat is movably connected to a front-to-back buffer seat, and the front-to-back adjustment seat can move back and forth relative to the front-to-back buffer seat; The second rotating seat is rotatably mounted on the front and rear adjusting seat; A height-adjustable headrest is mounted on the second rotating seat in a height-adjustable manner.

2. The office chair headrest structure with multi-dimensional adjustment according to claim 1, characterized in that: The headrest mounting base is provided with a snap-fit ​​groove for detachably engaging with the backrest of the office chair.

3. The office chair headrest structure with multi-dimensional adjustment according to claim 1, characterized in that: The lifting seat is provided with a first slide groove and a plurality of first ratchet grooves. The upper and lower ends of the first slide groove are respectively provided with an upper guide portion and a lower guide portion. The plurality of first ratchet grooves are arranged on one side of the first slide groove and are arranged sequentially from the upper guide portion to the lower guide portion. The lower guide portion gradually extends in an inclined direction away from the upper guide portion and away from the first ratchet groove. The headrest mounting base is provided with a first limiting groove, a first rotating groove, a first pawl and a first pressing elastic element. The first limiting groove and the first rotating groove are connected to each other and are arranged sequentially in the direction close to the first ratchet groove. The first pawl is rotatably mounted on the headrest mounting base. The first pressing elastic element is connected to the first pawl and its elastic force is directed towards the first ratchet groove. The first pawl is provided with a first sliding part and a first rotating part. The first sliding part is slidably engaged with the first sliding groove, and the first rotating part is rotatably engaged with the first rotating groove or the first limiting groove. The first rotating part can move back and forth between the first limiting groove and the first rotating groove. When the first rotating part is located in the first rotating groove, the first pawl is pressed against the first ratchet groove under the drive of the first clamping elastic member. The first pawl and the first ratchet groove are positioned and engaged so that the lifting seat can only rise relative to the headrest mounting seat. The lower guide portion can guide the first sliding portion to move to drive the first pawl to move, thereby causing the first rotating portion of the first pawl to enter the first limiting groove from the first rotating groove. When the first rotating part is located in the first limiting groove, the first pawl disengages from the first ratchet groove; The upper guide portion can guide the first sliding portion to move in order to drive the first pawl to move, thereby causing the first rotating portion of the first pawl to enter the first rotating groove from the first limiting groove.

4. The office chair headrest structure with multi-dimensional adjustment according to claim 1, characterized in that: The lifting seat is provided with a plurality of first damping teeth, and the first rotating seat is provided with a rotating shaft. The rotating shaft is rotatably engaged with the lifting seat. The outer periphery of the rotating shaft is provided with a plurality of second damping teeth, and the first damping teeth mesh with the second damping teeth.

5. The office chair headrest structure with multi-dimensional adjustment according to claim 1, characterized in that: The front and rear buffer seats are provided with a movable cavity inside, and the movable cavity has a guide groove that connects to the outside of the front and rear buffer seats. The first rotating seat is provided with a sliding support part, which is movably disposed in the movable cavity. A portion of the sliding support part is slidably engaged with the guide groove. The buffer elastic element is disposed in the movable cavity and connected to the sliding support part.

6. The office chair headrest structure with multi-dimensional adjustment according to claim 1, characterized in that: The front and rear adjustment seat is provided with a second slide groove and a plurality of second ratchet grooves. The front and rear ends of the second slide groove are respectively provided with a front guide and a rear guide. The plurality of second ratchet grooves are arranged on one side of the second slide groove and are arranged sequentially from the front guide to the rear guide. The rear guide gradually extends in an inclined direction away from the front guide in a direction away from the second ratchet groove. The front and rear buffer seats are provided with a second limiting groove, a second rotating groove, a second pawl, and a second pressing elastic element. The second limiting groove and the second rotating groove are connected to each other and are arranged sequentially in the direction close to the second ratchet groove. The second pawl is rotatably mounted on the front and rear buffer seats. The second pressing elastic element is connected to the second pawl, and its elastic force is directed towards the second ratchet groove. The second pawl is provided with a second sliding part and a second rotating part. The second sliding part is slidably engaged with the second sliding groove, and the second rotating part is rotatably engaged with the second rotating groove or the second limiting groove. The second rotating part can move back and forth between the second limiting groove and the second rotating groove. When the second rotating part is located in the second rotating groove, the second pawl is pressed against the second ratchet groove under the drive of the second clamping elastic member. The second pawl and the second ratchet groove are positioned and engaged so that the front and rear adjusting seat can only move relative to the front and rear buffer seat in the direction from the rear guide part to the second pawl. The rear guide portion can guide the second sliding portion to move to drive the second pawl to move, thereby causing the second rotating portion of the second pawl to enter the second limiting groove from the second rotating groove. When the second rotating part is located in the second limiting groove, the second pawl disengages from the second ratchet groove; The front guide portion can guide the second sliding portion to move in order to drive the second pawl to move, thereby causing the second rotating portion of the second pawl to enter the second rotating groove from the second limiting groove.

7. A multi-dimensional adjustable office chair headrest structure according to any one of claims 1 to 6, characterized in that: The second rotating seat is rotatably engaged with the front and rear adjusting seats via a damping rotating shaft structure.

8. A multi-dimensional adjustable office chair headrest structure according to any one of claims 1 to 6, characterized in that: The lifting headrest is provided with a lifting through groove, and a plurality of positioning tooth grooves are arranged sequentially from top to bottom in the lifting through groove. A portion of the second rotating seat passes through the lifting through groove, and a plurality of positioning teeth are provided on the second rotating seat, the positioning teeth being positioned and engaged with the positioning tooth grooves.

9. The office chair headrest structure with multi-dimensional adjustment according to claim 8, characterized in that: The lifting channel is also provided with a plurality of positioning grooves arranged sequentially from top to bottom, and the second rotating seat is provided with a positioning ball structure, which is positioned and engaged with the positioning groove.

10. An office chair, characterized in that, include: An office chair headrest structure with multi-dimensional adjustment as described in any one of claims 1 to 9.

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