Chair back support adjustment mechanism

Abstract

To provide a lumbar support adjuster structure for a chair, which adjusts the fixed position or the swing width of the lumbar support to meet the needs of a person sitting on the chair. [Solution] The lumbar support adjuster structure for a chair is equipped with an adjuster 20 that is attached to the seat back frame of a chair and can adjust the angle of the lumbar support. The adjuster has a fixed seat 21, a left housing 22, a right housing 23, an adjustment gear 24, an axle pin 25, and an adjustment dial 26. The fixed seat has two stopper parts on the left side, a compression spring 212 is fitted into the left side, two arc-shaped grooves 213 are formed on the right side, and a mounting hole is formed on the rear side. A left shaft sleeve 221 is provided at the upper end of the left housing. An annular tooth row 222 is provided on the right inner ring of the left shaft sleeve. An adjustment gear is provided on the right side of the left shaft sleeve. The left side surface of the adjustment gear has two columns 241 and positioning teeth 242 that mesh with the annular tooth row in the left shaft sleeve. Two position restriction plates 243 are provided on the right side surface of the adjustment gear.

Description

[Technical field]

[0001] This invention relates to a lumbar support adjuster structure for a chair, and in particular to a lumbar support adjuster structure for a chair that uses an adjuster that is attached to the seat back frame of a chair and can adjust the angle of the lumbar support, thereby adjusting the fixed position of the lumbar support or the size of the rocking range, thereby meeting the needs of the person sitting in the chair. [Background technology]

[0002] Conventional office chairs reduce fatigue and allow the person sitting in the chair to sit comfortably. Some office chairs have a protrusion on the backrest that supports the lower back of the person sitting in the chair, or a separate lower back support is attached to the backrest. In order to increase versatility, most of the structures in which the lower back support is attached to the seat back frame of the office chair can be adjusted in height, and the height can be adjusted appropriately according to the physique of the person sitting in the chair.

[0003] However, simply adjusting the height of the lumbar support was not enough to meet the needs of the person sitting in the chair. For example, chair sitters generally have different body types (fat, thin, etc.), sitting preferences, and habits. For example, people who are thin or who have the habit of sitting shallowly may find that simply adjusting the height of the lumbar support is too far away to lean on.

[0004] SUMMARY OF THE DISCLOSURE The present inventor has conducted extensive research in light of the above-mentioned shortcomings of the prior art, and as a result has completed a chair lumbar support adjuster structure that can improve upon the problems of the prior art. Summary of the Invention [Problem to be solved by the invention]

[0005] The main objective of this invention is to provide a lumbar support adjuster structure for a chair, which uses an adjuster that can be attached to the seat back frame of a chair to adjust the angle of the lumbar support, adjusts the fixed position or the swing range of the lumbar support, and meets the needs of the person sitting in the chair. [Means for solving the problem]

[0006] In order to solve the above problems, according to a first aspect of the present invention, there is provided a lumbar support adjuster structure for a chair, comprising an adjuster that is attached to a seat back frame of a chair and can adjust the angle of the lumbar support, the adjuster having a fixed seat, a left housing, a right housing, an adjustment gear, an axle pin and an adjustment dial, the fixed seat has two stopper portions on the left side, a compression spring is fitted into the left side, two arc-shaped grooves are formed on the right side, and a mounting hole is formed on the rear side, a left axle sleeve is provided on the upper end of the left housing, and a ring-shaped tooth row is provided on the right inner ring of the left axle sleeve, The adjustment gear is provided on the right side of the left housing, and the left side surface of the adjustment gear has two columns and positioning teeth that mesh with the annular tooth row in the left shaft sleeve. Two position regulating plates are provided on the right side of the adjustment gear. The two columns on the adjustment gear are inserted into two arc-shaped holes in the left shaft sleeve and exposed from the left side of the left shaft sleeve. A tenon groove is formed on the right side of the middle part of the left housing. A mortise hole is formed on the right side of the lower end of the left housing. A pivot hole is formed in the mortise hole and extends to the left side. A right shaft sleeve is provided on the upper end of the right housing, and the right shaft sleeve is provided on the right side of the right housing. the right housing has two arc-shaped plates on its left side and a torsion spring fitted inside the left side, an assembly tenon is provided on the left side of a middle portion of the right housing, an axis tenon is provided on the left side of the lower end of the right housing, and a pivot hole is formed in the axis tenon and penetrates to the right side, the left housing is fitted to the left side of the fixed seat, the right housing is fitted to the right side of the fixed seat, the assembly tenon of the right housing is fitted into the tenon groove of the left housing, the axis tenon at the lower end of the right housing is fitted into the tenon hole at the lower end of the left housing, and the left and right housings are screwed together by assembly screws, The left housing, the fixed seat and the right housing are assembled and screwed together by an axle pin screw, the adjustment dial is attached to the left side of the left axle sleeve at the upper end of the left housing, and the adjustment dial is screwed onto the two columns of the adjustment gear by a screw, and when the adjustment dial is pressed and twisted, the positioning teeth on the adjustment gear in the adjuster are pushed and moved, and the positioning teeth and the annular tooth row in the left axle sleeve are disengaged and displaced, thereby making it possible to adjust the relative positions of the left housing and the right housing and the fixed seat or the magnitude of the swing width.To provide a lumbar support adjustment structure for a chair. Effect of the Invention

[0007] The lumbar support adjuster structure of the present invention is a chair that uses an adjuster that is attached to the seat back frame of the chair and can adjust the angle of the lumbar support, thereby adjusting the fixed position or the swing range of the lumbar support to meet the needs of the person sitting in the chair. [Brief description of the drawings]

[0008] [Figure 1] 2 is a schematic diagram of a lumbar support adjuster structure for a chair according to an embodiment of the present invention; FIG. [Diagram 2] 1 is an exploded perspective view of an adjuster of a lumbar support adjuster structure for a chair according to an embodiment of the present invention; FIG. [Diagram 3] 1 is an exploded perspective view of an adjuster of a lumbar support adjuster structure for a chair according to an embodiment of the present invention; FIG. [Figure 4] 1 is a perspective view showing a fixed seat of a lumbar support adjuster structure for a chair according to an embodiment of the present invention; FIG. [Diagram 5] 1 is a perspective view of an adjuster of a lumbar support adjuster structure for a chair according to an embodiment of the present invention; FIG. [Figure 6] 2 is a schematic diagram of a lumbar support adjuster structure for a chair according to an embodiment of the present invention; FIG. [Figure 7] 2 is a schematic diagram of a lumbar support adjuster structure for a chair according to an embodiment of the present invention; FIG. [Figure 8] 2 is a schematic diagram of a lumbar support adjuster structure for a chair according to an embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In order to more completely and clearly disclose the technical means of the present invention and the effects that can be achieved thereby, the present invention will be described in detail below in conjunction with the accompanying drawings and symbols disclosed, although the present invention is not limited by such drawings.

[0010] Please refer to Fig. 1 to Fig. 5. As shown in Fig. 1 to Fig. 5, the lumbar support adjuster structure of a chair according to one embodiment of the present invention includes an adjuster 20 that is attached to the seat back frame 11 of a chair 10 and can adjust the angle of the lumbar support 12. The adjuster 20 has a fixed seat 21, a left housing 22, a right housing 23, an adjustment gear 24, a shaft pin 25, and an adjustment dial 26. The fixed seat 21 has two stopper parts 211 on the left side, and a compression spring 212 is fitted inside the left side. The fixed seat 21 has two arc-shaped grooves 213 on the right side. The fixed seat 21 has a mounting hole 214 on the rear side. The left housing 22 has a left shaft sleeve 221 on the upper end. The left shaft sleeve 221 has a right inner ring with an annular tooth row 222 on the right side. The left shaft sleeve 221 has an adjustment gear 24 on the right side. The left side surface of the adjustment gear 24 has two columns 241 and a positioning tooth 242 that meshes with the annular tooth row 222 in the left shaft sleeve 221. Two position regulating plates 243 are provided on the right side surface of the adjustment gear 24. The two columns 241 on the adjustment gear 24 are inserted into the two arc-shaped holes 223 of the left shaft sleeve 221 and are exposed from the left side of the left shaft sleeve 221. A tenon groove 224 is formed on the right side of the middle part of the left housing 22. A tenon hole 225 is formed on the right side of the lower end of the left housing 22. A pivot hole 226 is formed in the tenon hole 225, which penetrates to the left side. A right shaft sleeve 231 is provided on the upper end of the right housing 23. The right shaft sleeve 231 has two arc-shaped plates 232 on the left side surface, and a torsion spring 233 is fitted inside the left side. An assembly tenon 234 is provided on the left side of the middle part of the right housing 23. A shaft tenon 235 is provided on the left side of the lower end of the right housing 23. A pivot hole 236 is formed in the shaft tenon 235, penetrating through to the right side.

[0011] The left housing 22 is fitted to the left side of the fixed seat 21, and the two position restriction plates 243 on the adjustment gear 24 are inserted into the space between the two stopper portions 211 on the left side of the fixed seat 21, and the adjustment gear 24 is pressed by the compression spring 212 inside the left side of the fixed seat 21. The right housing 23 is fitted to the right side of the fixed seat 21, and the two arc-shaped plates 232 on the left side of the right shaft sleeve 231 are inserted into the two arc-shaped grooves 213 on the right side of the fixed seat 21, and are fitted into the torsion spring 233 inside the left side of the right shaft sleeve 231. The right end of the torsion spring 233 is hooked onto the arc-shaped plate 232, and the left end is inserted into an insertion hole 215 formed in the right side of the fixed base 21. The axle pin 25 is inserted into a left axle sleeve 221 provided at the upper end of the left housing 22, the fixed base 21, and a right axle sleeve 231 provided at the upper end of the right housing 23. The left housing 22, the fixed base 21, and the right housing 23 are assembled and screwed together by an axle pin screw 251.

[0012] When assembling the fixed base 21, the left housing 22 and the right housing 23, the assembly tenon 234 on the left side of the middle part of the right housing 23 is fitted into the tenon groove 224 on the right side of the middle part of the left housing 22, the shaft tenon 235 on the left side of the lower end of the right housing 23 is fitted into the mortise hole 225 on the right side of the lower end of the left housing 22, and the assembly screw 252 is inserted through the tenon groove 224 of the left housing 22 and screwed into the assembly tenon 234 of the right housing 23, and the left housing 22 and right housing 23 are screwed together.

[0013] The adjustment dial 26 is attached to the left side of the left shaft sleeve 221 at the upper end of the left housing 22, and the fitting groove 261 provided inside it is fitted into two columns 241 of the adjustment gear 24 exposed from the left side of the left shaft sleeve 221, and the adjustment dial 26 is screwed onto the two columns 241 of the adjustment gear 24 by screws 262.

[0014] When the adjustment dial 26 is pressed, the adjustment gear 24 is pushed, and the positioning teeth 242 disengage from the annular tooth row 222 in the left shaft sleeve 221. After the adjustment dial 26 is turned to rotate and displace the adjustment gear 24, the pressure on the adjustment dial 26 is released. When the adjustment gear 24 is pressed by the compression spring 212 screwed inside the left side of the fixed base 21, the positioning teeth 242 of the adjustment gear 24 mesh with the annular teeth row 222 in the left shaft sleeve 221, and by pressing and twisting the adjustment dial 26, the relative angle between the fixed base 21 and the left and right housings 22 and 23 can be adjusted. The two columns 241 of the adjustment gear 24 are inserted into the two arc-shaped holes 223 of the left shaft sleeve 221 and can only move within the limited range of the two arc-shaped holes 223, and the two position restriction plates 243 of the adjustment gear 24 are inserted into the space between the two stopper portions 211 on the left side of the fixed base 21 and are restricted by the two stopper portions 211 on the left side of the fixed base 21. As a result, a multi-stage angle rotation operation can be selected due to the double restriction on rotational movement.

[0015] A torsion spring 233 is provided between the fixed base 21 and the right shaft sleeve 231. The bending elasticity of the torsion spring 233 generates a relative rotational pressure force between the fixed base 21 and the left and right housings 22 and 23, and when the two arc-shaped plates 232 provided on the left side of the right shaft sleeve 231 are inserted into the two arc-shaped grooves 213 provided on the right side of the fixed base 21, the two arc-shaped grooves 213 restrict the relative rotational movement of the left and right housings 22 and 23 on the fixed base 21 only within a limited angular range.

[0016] Please refer to Figures 6 to 8. As shown in Figures 6 to 8, when the lumbar support adjuster structure for a chair according to one embodiment of the present invention is actually used, the upper end of the lumbar support 12 attached to the chair 10 is pivoted onto the seat back frame 11. The adjuster 20 of this embodiment is installed on the seat back frame 11 below. The adjuster 20 is screwed onto the seat back frame 11 using a mounting hole 214 formed on the rear side of the fixed seat 21 (this screw structure is a conventional technique and will not be described in detail here, nor shown in the drawings). The pivot holes 226, 236 formed on the lower ends of the left and right housings 22, 23 of the adjuster 20 are pivotally attached to the lower end of the lumbar support 12. The lumbar support 12 is supported by the adjuster 20, supporting the lumbar region of the person sitting in the chair. When the person sitting in the chair presses and twists the adjustment dial 26, the positioning teeth 242 on the adjustment gear 24 in the adjuster 20 and the annular teeth row 222 in the left shaft sleeve 221 come apart and can be displaced, so that the fixed position or the swing width of the lumbar support 12 can be adjusted to meet the personal needs of the person sitting in the chair.

[0017] The adjustment dial 26 of the regulator 20 and the left housing 22 may have scale marks engraved thereon so that the adjustment dial 26 can be easily operated.

[0018] The preferred embodiments of the present invention have been disclosed above so that those skilled in the art can understand, but they are not intended to limit the present invention. Various changes and modifications can be made within the scope of the present invention. Therefore, the scope of the utility model registration claims of the present invention should be broadly interpreted to include such changes and modifications. [Explanation of symbols]

[0019] 10 Chairs 11 Seat back frame 12 Hip Support 20 regulator 21 Fixed seat 22 Left housing 23 Right housing 24 Adjustment Gear 25 Axle Pin 26 Adjustment dial 211 Stopper part 212 Compression Spring 213 Arc groove 214 Mounting hole 215 Insertion hole 221 Left shaft sleeve 222 Annular dentition 223 Arc hole 224 Mortise and groove 225 Mortise 226 Pivot hole 231 Right shaft sleeve 232 Arc plate 233 Torsion Spring 234 Assembled tenon 235 Axis tenon 236 Pivot hole 241 Column 242 Positioning teeth 243 Position regulation plate 251 Axle pin screw 252 Assembly screw 261 Fitting tank 262 Screw

Claims

[Claim 1] A lumbar support adjustment structure for a chair, comprising: The seat backrest is provided with an adjuster that is attached to a seat back frame of a chair and can adjust the angle of the lumbar support. The adjuster includes a fixed seat, a left housing, a right housing, an adjustment gear, an axle pin, and an adjustment dial; The fixing seat has two stoppers on the left side, a compression spring is fitted on the left side, two arc-shaped grooves are formed on the right side, and a mounting hole is formed on the rear side. A left shaft sleeve is provided at the upper end of the left housing, an annular tooth row is provided on the right inner ring of the left shaft sleeve, the adjustment gear is provided on the right side of the left shaft sleeve, the left side surface of the adjustment gear has two columns and positioning teeth that mesh with the annular tooth row in the left shaft sleeve, two position restriction plates are provided on the right side surface of the adjustment gear, the two columns on the adjustment gear are inserted into two arc-shaped holes in the left shaft sleeve and exposed from the left side of the left shaft sleeve, a tenon groove is formed on the right side of the middle part of the left housing, a mortise hole is formed on the right side of the lower end of the left housing, and a pivot hole that penetrates to the left side is formed in the mortise hole, A right shaft sleeve is provided at the upper end of the right housing, the right shaft sleeve has two arc-shaped plates on the left side surface, and a torsion spring is fitted inside the left side. An assembly tenon is provided on the left side of the middle part of the right housing, and an axis tenon is provided on the left side of the lower end of the right housing, and a pivot hole is formed in the axis tenon, penetrating to the right side. the left housing is fitted to the left side of the fixed seat, the right housing is fitted to the right side of the fixed seat, the assembly tenon of the right housing is fitted into the tenon groove of the left housing, the axial tenon at the lower end of the right housing is fitted into the mortise hole at the lower end of the left housing, and the left housing and the right housing are screwed together with an assembly screw, and the left housing, the fixed seat, and the right housing are assembled and screwed together with an axial pin screw, The adjustment dial is attached to the left side of the left shaft sleeve at the upper end of the left housing, and the adjustment dial is screwed onto the two columns of the adjustment gear by screws; When the adjustment dial is pressed and twisted, the positioning teeth on the adjustment gear in the adjuster are pushed and disengaged from the annular tooth row in the left shaft sleeve, thereby adjusting the relative positions or the magnitude of the swinging width between the left and right housings and the fixed seat.

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