Ergonomic office chair

Abstract

The present invention discloses an ergonomic office chair, which relates to the field of chairs and aims to solve the problem that the chair back does not have independent support for various positions of the human back (upper back, lower back, head and neck). The main points of the technical solution are: an ergonomic office chair, including a base, a gas support seat and a cushion structure, the gas support seat is connected with an assembly integrated seat, the assembly integrated seat includes a lower connecting part, a lumbar support assembly part and a backrest connecting frame from bottom to top, armrest mechanisms are installed on both sides of the lower connecting part, the lumbar support assembly part is provided with a lumbar support assembly, the backrest connecting frame is movably connected with the backrest, the backrest connecting frame has an upper crossbeam, and the upper crossbeam is provided with a headrest assembly. The ergonomic office chair of the present invention not only realizes all-round support for users to improve comfort, but also the supports of the four parts are relatively independent, which effectively avoids the problem of the four parts affecting each other.

Description

Technical Field

[0001] The present invention relates to the field of chairs, and more particularly to an ergonomic office chair. Background Art

[0002] As a widely used seat in people's work and life, office chairs are generally recognized and loved by people. They are also one of the indispensable furniture in modern office and home environments. Currently, the adjustment functions of the backrests of office chairs on the market are mostly reclining adjustment, backrest lifting adjustment, and lumbar lifting adjustment.

[0003] An ergonomic chair disclosed in a Chinese patent announcement with announcement number CN109549386A has the following technical points: it includes a backrest assembly and a seat assembly, the backrest assembly includes an upper back bracket, a lower back bracket and a backrest frame that undergoes elastic deformation under traction or extrusion, and a locking mechanism that keeps the above three relatively fixed in position; the lower back bracket is connected to the seat assembly through a connecting rod, the lower end of the upper back bracket is rotatably connected to the upper end of the lower back bracket, and the upper and lower ends of the backrest frame are respectively hinged to the upper part of the upper back bracket and the lower part of the lower back bracket.

[0004] In the above technical solution, the upper back support and the lower back support are both arranged on the same chair back frame, so that when the force applied to the corresponding position of the upper back or the lower back changes, it is bound to cause the support angle or support force of the other part to change, and then cause the user to adjust the sitting posture of the other part to return to a comfortable support angle or support force; therefore, the ergonomic chair in the prior art has the problem that the chair back does not have independent support for various positions of the human back (upper back, lower back, head and neck); therefore, it is necessary to propose a new solution to solve this problem. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an ergonomic office chair, which not only provides all-round support to the user and improves comfort, but also has four relatively independent supports, effectively avoiding the problem of mutual influence among the four parts.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: an ergonomic office chair, comprising a base, a gas support seat that can be lifted and lowered on the base, and a cushion structure fixedly installed on the top surface of the gas support seat, the gas support seat is connected to an assembly integrated seat, and the assembly integrated seat includes a lower connecting part, a lumbar support assembly part and a backrest connecting frame from bottom to top, armrest mechanisms are installed on both sides of the lower connecting part, the lumbar support assembly part is provided with a lumbar support assembly, the backrest connecting frame is movably connected with a backrest, and the backrest connecting frame has an upper crossbeam, and the upper crossbeam is provided with a headrest assembly.

[0007] By adopting the above technical scheme, the present application adds an assembly integrated seat to provide a relatively independent installation position for the armrest mechanism, lumbar support assembly, backrest and headrest assembly, respectively. The armrest mechanism provides hand support for the user, the lumbar support assembly provides support for the waist and lower back of the user, the backrest provides support for the upper back of the user, and the headrest assembly provides support for the neck and head of the user. Not only does it achieve all-round support for the user and improve comfort, but the supports of the four parts are relatively independent, effectively avoiding the problem of mutual influence of the four parts. At the same time, the four parts are all arranged on the assembly integrated seat, and the assembly integrated seat is installed on the gas support seat, so that when the user adjusts the gas support seat, the four parts can synchronously accompany the user to lie down or sit up.

[0008] The present invention is further configured as follows: the lower connecting portion extends backward in a circular arc under the cushion structure, the armrest mechanism comprises a connecting arm, a sleeve portion, a telescopic arm and an armrest, the connecting arm extends laterally in a circular arc under the cushion structure until it extends out of the side of the cushion structure, the sleeve portion is vertically integrated at the protruding end of the connecting portion, the telescopic arm is telescopically inserted into the sleeve portion, and the armrest is arranged at the top of the telescopic arm.

[0009] The present invention is further configured as follows: the lumbar support assembly portion is vertically connected to the top end of the lower connecting portion, and has an engaging groove; the lumbar support assembly includes an engaging portion engaged with the engaging groove, a travel guide plate integrally formed with the engaging portion, a movable support portion movably connected to the travel guide plate, and a cam adjustment member for controlling the ejection amount of the movable support portion.

[0010] The present invention is further configured as follows: fitting plates are provided on both sides of the fitting portion, the fitting plates are fitted to the waist support assembly portion, the fitting plates are provided with hooks, and the waist support assembly portion is provided with a hooked groove for the hook to hook.

[0011] The present invention is further configured as follows: the travel guide plate extends upward in a circular arc and has two travel rails integrally formed therein; the movable support portion is provided with a travel slider that slides with the travel rail; the travel slider is provided with a travel hook with elastic deformation capability; and the travel rail is provided with a plurality of travel hook grooves for the travel hook to hook at equal intervals.

[0012] The present invention is further configured as follows: a U-shaped expansion and contraction portion is provided between the movable support portion and the stroke slider, a locking groove is provided on a side of the U-shaped expansion and contraction portion directly opposite to the cam adjustment member, the cam adjustment member includes a horizontal axis rotatably connected to the stroke slider, a rotating pinching handle arranged at both ends of the horizontal axis, and a gear eccentrically arranged on the horizontal axis, and the tooth tip of the gear is engaged with the locking groove.

[0013] The present invention is further configured as follows: the backrest connecting frame is provided with two oblique arms connected to the lumbar support assembly part, the two oblique arms are inclined to both sides and toward the cushion structure, the backrest includes a backrest frame and a contact mesh surface supported and unfolded by the backrest frame, at least four elastic rubber blocks are arranged between the backrest connecting frame and the backrest frame, a rear warped part is arranged at the bottom end of the backrest frame, and the lumbar support assembly also includes a fixed support part for supporting the rear warped part.

[0014] The present invention is further configured as follows: the headrest assembly includes a clamping block detachably clamped and fixed to the upper cross beam, a vertical arm longitudinally slidably connected to the clamping block, and a headrest arranged on the vertical arm, the vertical arm is symmetrically provided with two racks, the clamping block is gap-clamped on the two racks and is provided with rack teeth that cooperate with the rack grooves.

[0015] The present invention is further configured as follows: the seat cushion structure includes a seat cushion base installed on the gas support seat, a hardness adjustment pad covered and fixed on the seat cushion base, and a sponge pad covered on the hardness adjustment pad; the hardness adjustment pad is made of plastic with elastic deformation ability, and has a deformation center point, and the hardness adjustment pad is divided into multiple elastic plates with the deformation center point as the dividing center, and the lower surfaces of the multiple elastic plates are all provided with tightening force-bearing parts, and the tightening force-bearing parts of the multiple elastic plates are arranged in a circular shape when viewed from above with the deformation center point as the center; the multiple tightening force-bearing parts are sleeved with disc-shaped spring steel bars, and the innermost end of the disc-shaped spring steel bar is fixed to any tightening force-bearing part, and the seat cushion base is provided with an adjustment component, and a connecting rope is provided between the adjustment component and the outermost end of the disc-shaped spring steel bar.

[0016] The present invention is further configured as follows: the adjustment component includes an adjustment slot arranged on the seat cushion base, an adjustment slider sliding along the adjustment slot, and a pinching plate for applying force to the adjustment slider, the adjustment slider is connected to the end of the connecting rope; the adjustment slider is hollow and has two easily deformable thin walls, the outer sides of the two easily deformable thin walls are respectively provided with locking protrusions, and the slot walls of the adjustment slot are equidistantly provided with locking notches for the locking protrusions to be embedded; a self-locking support block is slidably connected between the adjustment sliders, the pinching plate is bolted to the self-locking support block, the self-locking support block has self-locking shallow teeth on both sides, and the inner side walls of the two easily deformable thin walls are provided with shallow tooth bosses matching the self-locking shallow teeth; reset compression springs are respectively provided between the two ends of the self-locking support block and the two ends of the inner wall of the adjustment slider.

[0017] In summary, the present invention has the following beneficial effects: it not only realizes all-round support for users and improves comfort, but also the supports of the four parts are relatively independent, effectively avoiding the problem of mutual influence of the four parts, and at the same time, the four parts are all arranged on the assembly integrated seat, and the assembly integrated seat is installed on the gas support seat, so that when the user adjusts the gas support seat, the four parts can synchronously accompany the user to lie down or sit up. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of this application;

[0019] Figure 2 This is a diagram showing the coordination of the integrated seat, armrest mechanism and headrest assembly for this application;

[0020] Figure 3 This is a schematic diagram of the structure of the integrated seat assembly of this application, mainly showing the structure of the lumbar support assembly part;

[0021] Figure 4 This is a schematic diagram of the structure of the lumbar support assembly of this application;

[0022] Figure 5 An exploded view of the lumbar support assembly of this application;

[0023] Figure 6 This is a diagram showing the matching relationship between the movable support part and the cam adjustment member of the present application;

[0024] Figure 7 This is a schematic diagram of the structure of the headrest assembly of this application;

[0025] Figure 8 This is an exploded view of the cushion structure of this application;

[0026] Fig. 9 This is a schematic diagram of the structure of the hardness adjustment pad of this application;

[0027] Fig.10 This is a schematic diagram of the structure of the seat cushion base of this application;

[0028] Fig.11 This is a schematic diagram of the structure of the adjustment slider for this application.

[0029] Description of the drawings: 11, base; 12, gas support seat; 13, lower connecting part; 14, lumbar support assembly part; 15, backrest connecting frame; 16, upper crossbeam; 17, universal wheel; 21, connecting arm; 22, sleeve part; 23, telescopic arm; 24, armrest; 31, fitting groove; 32, fitting part; 321, fitting plate; 322, hook; 323, hooked groove; 33, travel guide plate; 331, travel rail; 332, travel slider; 333, travel hook; 334, travel hook groove; 34, movable support part; 35, cam adjustment part; 351, U-shaped expansion and contraction part; 352, locking groove; 353, horizontal axis; 354, pinching handle; 355, gear; 36. Fixed support part; 41. Oblique arm; 42. Backrest frame; 43. Contact mesh surface; 44. Elastic rubber block; 45. Rear tilted part; 51. Clamp block; 52. Vertical arm; 53. Headrest; 54. Rack; 55. Rack clamp; 61. Cushion base; 62. Hardness adjustment pad; 63. Sponge pad; 64. Center point; 65. Elastic plate; 66. Tightening force part; 67. Disc spring steel bar; 68. Connecting rope; 71. Adjusting slide groove; 72. Adjusting slider; 73. Holding plate; 74. Deformable thin wall; 75. Locking protrusion; 76. Locking notch; 77. Self-locking support block; 78. Self-locking shallow teeth; 79. Shallow tooth boss; 80. Reset compression spring. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0031] An ergonomic office chair, such as Figure 1 As shown, it includes a base 11, a gas support seat 12 which can be lifted and lowered on the base 11, and a cushion structure fixedly installed on the top surface of the gas support seat 12. The base 11 is a five-claw support structure, which is equipped with a plurality of universal wheels 17. The gas support seat 12 is bolted with an assembly integrated seat, and the assembly integrated seat includes, from bottom to top, an integrally formed lower connecting portion 13, a lumbar support assembly portion 14 and a backrest connecting frame 15. Armrest mechanisms are installed on both sides of the lower connecting portion 13. The lumbar support assembly portion 14 is provided with a lumbar support assembly. The backrest connecting frame 15 is movably connected with the backrest. The backrest connecting frame 15 has an upper crossbeam 16, and the upper crossbeam 16 is provided with a headrest assembly.

[0032] The present application adds an assembly integrated seat to provide a relatively independent installation position for the armrest mechanism, lumbar support assembly, backrest and headrest assembly, respectively. The armrest mechanism provides support for the user's hands, the lumbar support assembly provides support for the user's waist and lower back, the backrest provides support for the user's upper back, and the headrest assembly provides support for the user's neck and head. Not only does it achieve all-round support for the user and improve comfort, but the supports of the four parts are relatively independent, effectively avoiding the problem of the four parts affecting each other. At the same time, the four parts are all arranged on the assembly integrated seat, and the assembly integrated seat is installed on the gas support seat 12, so that when the user adjusts the gas support seat 12, the four parts can synchronously accompany the user to lie down or sit up.

[0033] The specific structure of the armrest mechanism is as follows: Figure 2 As shown, the lower connecting portion 13 extends backward in an arc under the cushion structure, so that the assembled integrated seat avoids the cushion structure through the lower connecting portion 13, and the armrest mechanism includes a connecting arm 21, a sleeve portion 22, a telescopic arm 23 and an armrest 24. The connecting arm 21 extends laterally in an arc under the cushion structure until it extends out of the side of the cushion structure, thereby achieving the armrest mechanism's avoidance of the cushion structure. The sleeve portion 22 is vertically integrated at the protruding end of the connecting arm 21, the telescopic arm 23 is telescopically inserted into the sleeve portion 22, and the armrest 24 is slidably and rotatably connected to the top of the telescopic arm 23, thereby giving the armrest 24 a height-adjustable function to adapt to the different arm lengths of different users.

[0034] The specific structure of the lumbar support assembly is as follows: Figure 3 , Figure 4 As shown, the lumbar support assembly 14 is vertically connected to the top of the lower connecting portion 13, and has an engaging groove 31. The lumbar support assembly includes an engaging portion 32 engaged with the engaging groove 31, a travel guide plate 33 integrally formed with the engaging portion 32, a movable support portion 34 movably connected to the travel guide plate 33, and a cam adjustment member 35 for controlling the ejection amount of the movable support portion 34; the lumbar support assembly achieves the technical requirement of being fixedly installed on the lumbar support assembly 14 through the cooperation between the engaging portion 32 and the engaging groove 31, and the lumbar support assembly is an installable structure. After purchasing the basic version of the ergonomic chair, the user can purchase the lumbar support assembly separately according to demand. The lumbar support assembly uses the movable support portion 34 to provide support for the user's lower back. At the same time, the movable support portion 34 has the ability to adjust the height through the travel guide plate 33 to adapt to the user's different height requirements for lumbar support. The movable support portion 34 also has the ability to adjust the front support distance through the cam adjustment member 35.

[0035] To improve the assembly strength of the lumbar support assembly, Figure 3 , Figure 4As shown, both sides of the engaging portion 32 are integrally formed with a fitting plate 321, and the fitting plate 321 is fitted to the lumbar support assembly portion 14, thereby increasing the connection amount between the engaging portion 32 and the lumbar support assembly portion 14 and improving the connection tightness between the two. The fitting plate 321 is integrally formed with a hook 322, and the lumbar support assembly portion 14 is integrally formed with a hooked groove 323 for the hook 322 to hook, thereby utilizing the cooperation of the hook 322 and the hooked groove 323 to limit the lateral mobility of the lumbar support assembly, further improving the assembly strength of the lumbar support assembly, and when installing the lumbar support assembly, it is only necessary to guide the engaging portion 32 to align with the lumbar support assembly portion 14 and press it in, thereby ensuring the convenience of independent installation by the user.

[0036] The movable support portion 34 can be adjustably connected to the travel guide plate 33 in the following manner: Figure 4 , Figure 5 As shown, the travel guide plate 33 extends upward in an arc shape and is integrally formed with two travel rails 331. The movable support portion 34 is integrally formed with a travel slider 332 that slidably cooperates with the travel rail 331, so that the adjustable trajectory of the movable support portion 34 is limited by the cooperation between the travel rail 331 and the travel slider 332. The travel slider 332 is provided with a travel hook 333 with elastic deformation ability, and the travel rail 331 is evenly spaced with a plurality of travel hook grooves 334 for the travel hook 333 to hook. So that the travel hook grooves 334 and the travel hook 333 are used to hook and cooperate to limit the activity of the movable support portion 34 and effectively prevent it from moving abnormally.

[0037] The cam adjusting member 35 adjusts the front support distance of the movable support portion 34 in the following manner: Figure 5 , Figure 6 As shown, a U-shaped expansion and contraction portion 351 is provided between the movable support portion 34 and the stroke slider 332, and a locking groove 352 is integrally formed on the side of the U-shaped expansion and contraction portion 351 facing the cam adjustment member 35, and the cam adjustment member 35 includes a horizontal shaft 353 rotatably connected to the stroke slider 332, a rotating pinching handle 354 integrally formed at both ends of the horizontal shaft 353, and a gear 355 eccentrically arranged on the horizontal shaft 353, and the tip of the tooth of the gear 355 is engaged with the locking groove 352; when it is necessary to adjust the front support distance of the movable support portion 34, the user controls the rotation of the horizontal shaft 353 and the gear 355 by rotating the pinching handle 354, and adjusts the gear 355 to abut against the locking groove 352 at different angles, so as to control the expansion amount of the U-shaped expansion and contraction portion 351, and then adjust the front support distance of the movable support portion 34, which has the technical effect of convenient adjustment, and the engagement of the teeth of the gear 355 with the locking groove 352 effectively prevents the cam adjustment member 35 from abnormal rotation.

[0038] The specific structure of the backrest is as follows: Figure 1 , Figure 3As shown, the backrest connecting frame 15 is integrally formed with two oblique arms 41 connected to the lumbar support assembly part 14, and the two oblique arms 41 are inclined to both sides and toward the cushion structure, so as to realize the widening and forward movement of the backrest connecting frame 15, and the backrest includes a backrest frame 42 and a contact mesh surface 43 supported and unfolded by the backrest frame 42, and at least four elastic rubber blocks 44 are arranged between the backrest connecting frame 15 and the backrest frame 42, and the two ends of the elastic rubber blocks 44 are embedded and bolted to the backrest connecting frame 15 and the backrest frame 42, and the backrest frame 42 and the backrest connecting frame 15 are connected by the elastic rubber blocks 44, so as to improve the elastic momentum of the backrest, and effectively reduce the influence of the overall elastic performance of the backrest caused by the indirect connection of the backrest to the gas support seat 12.

[0039] It should be noted that if Figure 1 As shown, a rear tilted portion 45 is integrally formed at the bottom end of the backrest frame 42, and the lumbar support assembly also includes a fixed support portion 36 for supporting the rear tilted portion 45, so that the rear tilted portion 45 and the fixed support portion 36 cooperate to support the user's waist and hip connection area, further improving the support range of the present application for the user.

[0040] The specific structure of the headrest assembly is as follows: Figure 1 , Figure 7 As shown, the headrest assembly includes a clamping block 51 detachably clamped and fixed to the upper cross beam 16, a vertical arm 52 longitudinally slidably connected to the clamping block 51, and a headrest 53 installed on the vertical arm 52. The vertical arm 52 is symmetrically integrally formed with two racks 54. The clamping block 51 is gap-clamped on the two racks 54 and is integrally formed with rack teeth 55 that cooperate with the grooves of the racks 54. The cooperation between the racks 54 and the clamping block 51 is used to give the headrest 53 the ability to adjust its height, so as to meet the head and neck support height requirements of different users. The cooperation between the rack teeth 55 and the grooves of the rack 54 is used to prevent the headrest 53 from abnormally rising and falling.

[0041] The specific structure of the cushion structure is as follows: Figure 1 , Figure 8 As shown, the seat cushion structure includes a seat cushion base 61 installed on the gas support seat 12, a hardness adjustment pad 62 covered and fixed on the seat cushion base 61, and a sponge pad 63 covered on the hardness adjustment pad 62. The seat cushion structure is assembled with the gas support seat 12 through the seat cushion base 61, and a soft surface touch is provided through the sponge pad 63. The overall hardness of the seat cushion structure is adjusted through the hardness adjustment pad 62, so as to provide users with a more comfortable sitting hardness.

[0042] The specific structure of the hardness adjustment pad 62 is as follows: Figure 8 , Fig. 9As shown, the hardness adjustment pad 62 is made of plastic with elastic deformation ability, which has a deformation center point 64. The hardness adjustment pad 62 is divided into multiple elastic plates 65 with the deformation center point 64 as the dividing center. The lower surfaces of the multiple elastic plates 65 are all integrally formed with tightening force parts 66. The tightening force parts 66 of the multiple elastic plates 65 are arranged in a circle when viewed from above with the deformation center point 64 as the center. When it is necessary to adjust the overall hardness of the cushion structure, it is only necessary to adjust the clamping force of the multiple tightening force parts 66 to adjust the tightening force of the multiple hardness adjustment pads 62, thereby achieving the adjustment of the overall hardness of the cushion structure.

[0043] The present application adjusts the clamping force of the multiple tightening force-bearing parts 66 in the following manner: Fig. 9 As shown, multiple tightening force-bearing parts 66 are sleeved with disc-shaped spring steel bars 67, the innermost end of the disc-shaped spring steel bars 67 is fixed to any tightening force-bearing part 66, and the cushion base 61 is provided with an adjustment component, and a connecting rope 68 is provided between the adjustment component and the outermost end of the disc-shaped spring steel bar 67; the shrinkage amount of the disc-shaped spring steel bar 67 can be adjusted by only pulling or loosening the connecting rope 68 through the adjustment component, thereby realizing the adjustment of the clamping force of the multiple tightening force-bearing parts 66.

[0044] The specific structure of the adjustment component is as follows: Fig. 9 , Fig.10 As shown, the adjustment component includes an adjustment slot 71 arranged on the seat cushion base 61, an adjustment slider 72 sliding along the adjustment slot 71, and a pinching plate 73 for applying force to the adjustment slider 72, and the adjustment slider 72 is connected to the end of the connecting rope 68; the user applies force to the adjustment slider 72 through the pinching plate 73 to force it to slide along the adjustment slot 71, and the user can control the clamping force of the disc spring steel bar 67 on the tightening force part 66 through the connecting rope 68, thereby completing the overall hardness adjustment of the seat cushion structure, and has the technical effect of convenient adjustment.

[0045] The present application limits the sliding of the adjustment slider 72 in the following manner: Fig.10 , Fig.11 As shown, the adjustment slider 72 is a hollow structure, which has two deformable thin walls 74. The outer sides of the two deformable thin walls 74 are respectively integrally formed with locking protrusions 75, and the groove wall of the adjustment slide groove 71 is evenly spaced and integrally formed with locking grooves 76 for the locking protrusions 75 to be embedded in. When the user completes the hardness adjustment, the deformable thin walls 74 release the elastic potential energy to reset, thereby pushing the locking protrusions 75 to be embedded in the nearest locking grooves 76, thereby limiting the sliding ability of the adjustment slider 72 through the cooperation between the locking protrusions 75 and the locking grooves 76.

[0046] To prevent the disc spring steel strip 67 from exerting a pulling force on the adjusting slider 72, thereby causing the adjusting slider 72 to slide abnormally, as shown in FIG. Fig.11As shown, a self-locking support block 77 is slidably connected between the adjustment sliders 72, and the pinching plate 73 is bolted to the self-locking support block 77. Self-locking shallow teeth 78 are provided on both sides of the self-locking support block 77. The inner center of the two deformable thin walls 74 is integrally formed with a shallow tooth boss 79 that cooperates with the self-locking shallow teeth 78. When the user applies force to the pinching plate 73, the self-locking shallow teeth 78 of the self-locking support block 77 are first forced to disengage from the shallow tooth boss 79. At this time, the deformable thin wall 74 loses its supporting force from the inside to the outside, so that the user can continue to adjust the After the pinching plate 73 applies force in the same direction, the adjusting slider 72 can be forced to slide; when the hardness adjustment is completed, the deformable thin wall 74 releases its elastic potential energy to reset, and the self-locking support block 77 resets to the self-locking shallow teeth 78 abutting against the shallow tooth boss 79, which can maintain the support force from the inside and outside of the deformable thin wall 74, eliminate the deformability of the deformable thin wall 74, thereby ensuring that the locking protrusion 75 is always engaged in the locking groove 76, thereby preventing the adjusting slider 72 from sliding abnormally.

[0047] To achieve the automatic resetting of the self-locking support block 77, Fig.11 As shown, return compression springs 80 are respectively provided between the two ends of the self-locking support block 77 and the two ends of the inner wall of the adjusting slider 72, so that the self-locking support block 77 is pushed by the two return compression springs 80 to achieve automatic return in the natural state.

[0048] The specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An ergonomic office chair, comprising a base (11), a gas support seat (12) movably mounted on the base (11), and a seat cushion structure fixedly mounted on the top surface of the gas support seat (12), Features: The gas support seat (12) is connected to an assembly integrated seat, and the assembly integrated seat comprises, from bottom to top, a lower connection part (13), a lumbar support assembly part (14), and a backrest connection frame (15), armrest mechanisms are installed on both sides of the lower connection part (13), the lumbar support assembly part (14) is provided with a lumbar support component, the backrest connection frame (15) is movably connected to the backrest, and the backrest connection frame (15) has an upper crossbeam (16), and the upper crossbeam (16) is provided with a headrest component; The seat cushion structure comprises a seat cushion base (61) mounted on the gas support seat (12), a hardness adjustment pad (62) covered and fixed on the seat cushion base (61), and a sponge pad (63) covered on the hardness adjustment pad (62); The hardness adjustment pad (62) has a deformation center point (64), and the hardness adjustment pad (62) is divided into a plurality of elastic plates (65) with the deformation center point (64) as the dividing center, and the lower surfaces of the plurality of elastic plates (65) are all provided with tightening force-bearing parts (66), and the tightening force-bearing parts (66) of the plurality of elastic plates (65) are arranged in a circular shape with the deformation center point (64) as the center when viewed from above; A plurality of the tightening force-bearing parts (66) are sleeved with disc-shaped spring steel strips (67), the innermost end of the disc-shaped spring steel strip (67) is fixed to any tightening force-bearing part (66), the cushion base (61) is provided with an adjustment component, and a connecting rope (68) is provided between the adjustment component and the outermost end of the disc-shaped spring steel strip (67).

2. An ergonomic office chair according to claim 1, Features: The lower connecting portion (13) extends backward in an arc shape below the cushion structure; the armrest mechanism comprises a connecting arm (21), a sleeve portion (22), a telescopic arm (23) and an armrest (24); the connecting arm (21) extends laterally in an arc shape below the cushion structure until it protrudes from the side of the cushion structure; the sleeve portion (22) is vertically integrally formed at the protruding end of the connecting arm (21); the telescopic arm (23) is telescopically plugged into the sleeve portion (22); and the armrest (24) is arranged at the top end of the telescopic arm (23).

3. The ergonomic office chair according to claim 1, Features: The lumbar support assembly portion (14) is vertically connected to the top end of the lower connecting portion (13) and has an engaging groove (31). The lumbar support assembly comprises an engaging portion (32) engaged with the engaging groove (31), a travel guide plate (33) integrally formed with the engaging portion (32), a movable support portion (34) movably connected to the travel guide plate (33), and a cam adjustment member (35) for controlling the ejection amount of the movable support portion (34).

4. The ergonomic office chair according to claim 3, Features: The fitting plate (321) is provided on both sides of the fitting portion (32), the fitting plate (321) is fitted to the waist support assembly portion (14), the fitting plate (321) is provided with a hook (322), and the waist support assembly portion (14) is provided with a hooked groove (323) for being hooked by the hook (322).

5. The ergonomic office chair according to claim 3, Features: The travel guide plate (33) extends upward in an arc shape and is integrally formed with two travel rails (331); the movable support portion (34) is provided with a travel slider (332) that is slidably matched with the travel rail (331); the travel slider (332) is provided with a travel hook (333) having elastic deformation capability; and the travel rail (331) is provided with a plurality of travel hook grooves (334) at equal intervals for the travel hook (333) to hook.

6. The ergonomic office chair according to claim 5, Features: A U-shaped expansion and contraction portion (351) is provided between the movable support portion (34) and the travel slider (332); a locking groove (352) is provided on a side of the U-shaped expansion and contraction portion (351) facing the cam adjustment member (35); the cam adjustment member (35) comprises a horizontal shaft (353) rotatably connected to the travel slider (332), a rotatable gripping handle (354) provided at both ends of the horizontal shaft (353), and a gear (355) eccentrically provided on the horizontal shaft (353); a tooth tip of the gear (355) is engaged with the locking groove (352).

7. The ergonomic office chair according to claim 3, Features: The backrest connecting frame (15) is provided with two oblique arms (41) connected to the lumbar support assembly part (14), the two oblique arms (41) are inclined to both sides and toward the seat cushion structure, the backrest comprises a backrest frame (42) and a contact mesh surface (43) supported and unfolded by the backrest frame (42), at least four elastic rubber blocks (44) are arranged between the backrest connecting frame (15) and the backrest frame (42), a rear warping part (45) is arranged at the bottom end of the backrest frame (42), and the lumbar support assembly also comprises a fixed support part (36) for supporting the rear warping part (45).

8. The ergonomic office chair according to claim 1, Features: The headrest assembly comprises a clamping block (51) detachably clamped and fixed to an upper crossbeam (16), a vertical arm (52) longitudinally slidably connected to the clamping block (51), and a headrest (53) arranged on the vertical arm (52); the vertical arm (52) is symmetrically provided with two racks (54); the clamping block (51) is gap-clamped on the two racks (54) and is provided with rack teeth (55) that cooperate with notches of the racks (54).

9. The ergonomic office chair according to claim 1, Features: The hardness adjustment pad (62) is made of plastic with elastic deformation capability.

10. The ergonomic office chair according to claim 9, Features: The adjustment assembly comprises an adjustment slot (71) arranged on the seat cushion base (61), an adjustment slider (72) sliding along the adjustment slot (71), and a holding plate (73) for applying force to the adjustment slider (72); the adjustment slider (72) is connected to an end of a connection rope (68); The adjusting slide block (72) is hollow and has two deformable thin walls (74). The outer sides of the two deformable thin walls (74) are respectively provided with locking protrusions (75). The groove wall of the adjusting slide groove (71) is provided with locking notches (76) at equal intervals for the locking protrusions (75) to be embedded. A self-locking support block (77) is slidably connected between the adjusting sliders (72), the holding plate (73) is bolted to the self-locking support block (77), both sides of the self-locking support block (77) are provided with self-locking shallow teeth (78), and the centers of the inner side walls of the two deformable thin walls (74) are provided with shallow tooth bosses (79) that cooperate with the self-locking shallow teeth (78); Reset compression springs (80) are respectively arranged between the two ends of the self-locking support block (77) and the two ends of the inner wall of the adjusting slide block (72).

Images