CN216961914U - Office chair supported by waist rest - Google Patents

Abstract

The utility model relates to and discloses an office chair supported by a waist rest. Relates to the technical field of office chairs. The chair specifically comprises a chair seat for people to sit, armrests, a chair back and chair legs, wherein the armrests are arranged on two sides of the chair seat and are used for supporting arms, the chair back is arranged at the tail end of the chair seat and is used for supporting the back, and the chair legs are arranged at the bottom of the chair seat and are used for supporting the chair seat; the middle of one side of the chair back, which is close to the chair seat, is provided with a waist support for supporting the waist, and the chair further comprises a height adjusting device and a length adjusting device, wherein the height adjusting device is used for adjusting the height of the waist support on the chair back, and the length adjusting device is used for adjusting the length of the waist support extending from the chair back. According to the utility model, the height of the waist rest on the chair back is adjusted through the height adjusting device, and the length of the waist rest extending from the chair back is adjusted through the length adjusting device, so that the waist rest can support the most comfortable positions of the waists of different people, the practicability of the office chair is enhanced, and the use experience of a user is improved.

Description

Office chair supported by waist rest

Technical Field

The utility model relates to the technical field of office chairs, in particular to an office chair supported by a waist rest.

Background

The office chair refers to various chairs which are matched for convenient work in daily work and social activities. The office chair is indispensable office furniture of daily official working, all is provided with the waist on the back of the chair of office chair usually and leans on for support the people's waist of sitting on office chair to make office chair to the support nature of people stronger, make the people sit more comfortable. However, the height and the length of the waist support of the existing office chair cannot be adjusted, so that the waist of a part of users is not supported in the most comfortable position, and the use experience of the users is influenced.

Chinese patent CN209346442U, published 2019-09-06, discloses a lumbar support for office chairs, which is composed of a lumbar support adjusting mechanism arranged in the middle of a backrest of a chair and a lumbar support arranged on the lumbar support adjusting mechanism; the distance between the lumbar support and the seat backrest is adjusted through the lumbar support adjusting mechanism; the waist rest adjusting mechanism consists of an adjusting knob, an adjusting hollow rod, an adjusting screw rod and a push rod which are connected in sequence; this waist is supported and is set up in office chair's back department, and it not only can form effective support to office staff's lumbar vertebrae, still can be for back regulation distance to be applicable to the people of various different sizes and use, improved application scope and health care effect. However, the waist rest can only adjust the length, and cannot adjust the height, so that the waist of a part of the user is not supported in the most comfortable position, and the use experience of the user is affected.

Disclosure of Invention

The utility model aims to provide an office chair with a waist support, which can realize the height adjustment of the waist support of the office chair and the length adjustment of the waist support, and improve the use experience of users.

The utility model provides an office chair supported by a waist rest, which comprises a chair seat for people to sit, armrests, a chair back and chair legs, wherein the armrests are arranged on two sides of the chair seat and are used for supporting arms; the back of the chair is close to the waist that the one side middle part of seat support was equipped with and is used for supporting the waist is leaned on, still includes height adjusting device and length adjusting device, height adjusting device is used for adjusting the waist leans on in the height on the back of the chair, length adjusting device is used for adjusting the waist leans on the follow the length that extends on the back of the chair.

Further, the lumbar support comprises an inner layer of elastic supporting pad and an outer layer of fabric.

Further, the height adjusting device comprises a guide rail arranged in the middle of the chair back, a sliding plate which slides up and down in the guide rail, and a connecting rod, one end of the connecting rod is connected with the sliding plate, and the other end of the connecting rod is connected with the waist support.

Furthermore, the sliding plate is provided with a marble, the guide rail is provided with a plurality of first through holes which are longitudinally arranged, and when the sliding plate slides up and down in the guide rail, the marble is matched with the first through holes.

Furthermore, a second through hole is formed in the chair back, the length adjusting device comprises an adjusting rod, one end of the adjusting rod penetrates through the second through hole from the outside of the chair back and is connected with the guide rail, and when the length of the adjusting rod is changed, the waist rest is adjusted to extend out of the chair back.

Further, adjust the pole including the screw rod that is equipped with the external screw thread to and be equipped with the double-screw bolt of external screw thread complex screw hole, screw rod one end is followed the back of the chair outside is run through behind the second through-hole with the screw hole spiro union, double-screw bolt one end with the guide rail is connected.

Furthermore, the screw rod comprises a supporting portion and a threaded portion, one end of the supporting portion is in running fit with the second through hole when penetrating through the second through hole from the outside of the chair back, and the threaded portion is arranged at one end of the supporting portion, which penetrates through the second through hole.

Furthermore, the adjusting rod further comprises a rotary handle arranged at one end, far away from the screw rod, of the bolt connected with the screw rod in a threaded manner, and an arc-shaped groove convenient to rotate is formed in the rotary handle.

Further, the length adjusting device further comprises a bearing piece arranged in the second through hole, the outer wall of the bearing piece is fixedly connected with the inner wall of the second through hole, an insertion groove is formed in the inner wall of the bearing piece, and a key strip matched with the insertion groove is arranged on the supporting portion.

Furthermore, the supporting part circumference is equipped with the baffle, the baffle is in supporting part one end is followed the back of the chair outside runs through when the second through-hole, with the back of the chair is kept away from the one side butt of seat support.

The office chair supported by the waist rest has the following advantages:

(1) the height of the waist rest on the chair back is adjusted through the height adjusting device, so that the waist rest can support the waist of people with different heights at the most comfortable position, and the comfort of users is improved; the length of the waist rest extending from the chair back is adjusted through the length adjusting device, so that the waist rest can better support the waist of people with different sitting postures, the practicability of the office chair is enhanced, and the use experience of users is improved;

(2) the periphery of the elastic supporting pad of the office chair is wrapped with the fabric, and the fabric is usually latticed, so that the waist of a user can be prevented from being completely attached to the elastic supporting pad, and the air permeability of the office chair is better;

(3) the sliding plate of the office chair can slide up and down along the guide rail, one end of the connecting rod is fixedly connected with the sliding plate, and the other end of the connecting rod is fixedly connected with the lumbar support, so that the lumbar support and the sliding plate can synchronously slide up and down along the guide rail, and the height of the lumbar support on the chair back can be adjusted through the up-and-down sliding of the sliding plate in the guide rail;

(4) the sliding plate of the office chair is provided with the marble, the guide rail is longitudinally provided with a plurality of first through holes, and the height of the sliding plate on the guide rail is fixed through the cooperation of the marble and one of the first through holes, so that the height of the waist leaning on the chair back is fixed;

(5) the chair back of the office chair is provided with a second through hole, one end of the adjusting rod penetrates through the second through hole from the outside of the chair back and is fixedly connected with the guide rail, so that when the length of the adjusting rod is changed from the outside of the chair back, the guide rail is pushed to move towards the direction close to the chair back or away from the chair back, the sliding plate and the lumbar support move towards the direction close to the chair back or away from the chair back synchronously with the guide rail, and the length of the lumbar support extending from the chair back is adjusted;

(6) the adjusting rod of the office chair comprises a screw rod and a stud, wherein the screw rod is provided with an external thread, the stud is provided with a threaded hole, and the stud in threaded connection with the screw rod can linearly move on the screw rod when the screw rod rotates through the matching of the external thread and the threaded hole, so that the integral length of the adjusting rod is changed;

(7) set up the bearing spare in the second through-hole of this office chair, the outer wall of bearing spare and the inner wall fixed connection of second through-hole, and be equipped with the inserting groove on the inner wall of bearing spare, be equipped with the keybar on the supporting part, when the supporting part runs through the second through-hole, the keybar is pegged graft with the inserting groove and is cooperated, and is fixed with the inner ring and the supporting part of bearing spare to further reduce the supporting part when rotating and the friction between the second through-hole inner wall.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model. In the drawings, like reference numerals are used to indicate like elements.

FIG. 1 is a schematic structural view of a lumbar support office chair according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a back of an office chair supported by a lumbar support according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of the connection between the height adjustment device of the office chair supported by the lumbar support and the lumbar support according to the embodiment of the present invention;

FIG. 4 is a schematic front and back side view of a track of a lumbar support office chair according to an embodiment of the present invention;

FIG. 5 is a schematic view of a slide plate of a lumbar support office chair according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a length adjustment device of an office chair supported by a lumbar support according to an embodiment of the present invention.

In the figure: 1. a chair seat; 2. a handrail; 3. a chair back; 31. a second through hole; 32. a bearing member; 321. inserting grooves; 4. chair legs; 5. a height adjustment device; 51. a guide rail; 511. a first through hole; 512. a stud; 5121. a threaded hole; 52. a slide plate; 521. a marble; 522. adjusting the handle; 53. a connecting rod; 6. a length adjustment device; 61. a support portion; 611. a baffle plate; 612. a key bar; 62. a threaded portion; 63. rotating the handle; 7. the waist is backed.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts will fall within the protection scope of the present invention.

The office chair supported by the lumbar support 7 comprises a chair seat 1 for people to sit, armrests 2 arranged on two sides of the chair seat 1 and used for supporting arms, a chair back 3 arranged at the tail end of the chair seat 1 and used for supporting the back, and chair legs 4 arranged at the bottom of the chair seat 1 and used for supporting the chair seat 1; the middle of one side of the chair back 3 close to the chair seat 1 is provided with a lumbar support 7 for supporting the waist, and the chair further comprises a height adjusting device 5 and a length adjusting device 6, wherein the height adjusting device 5 is used for adjusting the height of the lumbar support 7 on the chair back 3, and the length adjusting device 6 is used for adjusting the length of the lumbar support 7 extending from the chair back 3, and the specific effects are shown in fig. 1.

In this application, the office chair includes seat support 1, chair foot 4, back of the chair 3 and handrail 2, seat support 1 is used for supplying the people to sit down, back of the chair 3 sets up the tail end at seat support 1, be used for supporting the people back of sitting on seat support 1, handrail 2 sets up both ends about seat support 1, be used for supporting the people arm of sitting on seat support 1, chair foot 4 sets up the bottom at seat support 1, and with the ground butt, be used for supporting seat support 1 and the people of sitting on seat support 1. The middle part of the seat 1 is provided with a waist rest 7 for supporting the waist of a person sitting on the seat 1, so that the office seat 1 has stronger support for the person and the person can sit more comfortably.

Because the heights of each person are different, the positions needing to be supported by the lumbar support 7 are different, and the height of the lumbar support 7 of the existing office chair is fixed and cannot be adjusted, so that the support for the waist of part of users is not in the most comfortable position, and the use experience of the users is influenced; the other problem is that everyone has different sitting postures on the office chair, and people like to sit backwards on the office chair seat 1, and people like to sit at the front half section of the office chair seat 1, the bending degrees of the waist parts of the people are different, and the waist back 7 of the existing office chair is fixed in length and cannot be adjusted, so that on one hand, the waist back 7 has too large supporting force on the waist part of the people who like to sit backwards on the chair seat 1, and the office comfort of the user sitting on the office chair is influenced; on the other hand, the lumbar support 7 cannot support the lumbar region of a person who likes to sit forward on the seat 1, or the supporting force is too small to sufficiently exert the function of the lumbar support 7.

Therefore, in the application, the office chair further comprises a height adjusting device and a length adjusting device 6, the height of the waist support 7 on the chair back 3 is adjusted through the height adjusting device 5, so that the waist support 7 can support the waist of people with different heights at the most comfortable position, and the comfort of users is improved; adjust the waist through length adjustment device 6 and lean on 7 from the length that extends on the back of the chair 3, make the waist lean on 7 can play better support to the people's waist of different positions of sitting, strengthen this office chair's practicality, promote user's use and experience the sense.

In this embodiment, the lumbar support 7 includes an inner layer of elastic support pad, and an outer layer of fabric. Waist leans on 7 including elastic support pad and parcel at the outlying fabric of elastic support pad, elastic support pad when can carrying out fine support to user's waist, is the flexonics with the contact of user's waist, promotes user's comfort level. At the peripheral parcel fabric of elastic support pad, be in order to strengthen the gas permeability that the waist leaned on 7, when the waist leaned on 7 to support user's waist, the waist leaned on 7 and closely laminated with user's waist, and long-time laminating probably causes user's waist not ventilative, arouses skin problems such as eczema, and the fabric is latticed usually, can prevent that user's waist from laminating completely with the elastic support pad to make the gas permeability of this office chair better.

In the present embodiment, the height adjusting device 5 includes a guide rail 51 provided in the middle of the seat back 3, a slide plate 52 sliding up and down in the guide rail 51, and a link 53 having one end connected to the slide plate 52 and the other end connected to the lumbar support 7, as shown in fig. 1 and 3. The middle part of the chair back 3 is provided with a guide rail 51, the sliding plate 52 is matched with the guide rail 51, so that the sliding plate 52 can slide up and down along the guide rail 51, one end of the connecting rod 53 is fixedly connected with the sliding plate 52, the other end of the connecting rod is fixedly connected with the lumbar support 7, so that the lumbar support 7 can synchronously slide up and down along the guide rail 51 with the sliding plate 52, and the height of the lumbar support 7 on the chair back 3 can be adjusted through the up-and-down sliding of the sliding plate 52 in the guide rail 51. In the application, an adjusting handle 522 can be further arranged at the top of the sliding plate 52, and the sliding plate 52 is driven by the adjusting handle 522 to move up and down in the guide rail 51, so that the height of the lumbar support 7 on the chair back 3 can be adjusted more conveniently and easily.

In the embodiment, the sliding plate 52 is provided with a marble 521, the guide rail 51 is provided with a plurality of longitudinally arranged first through holes 511, and the marble 521 is matched with the first through holes 511 when the sliding plate 52 slides up and down in the guide rail 51, and the specific effect is shown in fig. 3 and 5. Because the height of the lumbar support 7 on the chair back 3 is adjusted by sliding the sliding plate 52 up and down in the guide rail 51, the lumbar support 7 and the sliding plate 52 are driven to synchronously slide up and down in the guide rail 51, and under the influence of the self gravity of the sliding plate 52 and the lumbar support 7, if the height of the sliding plate 52 in the guide rail 51 is not fixed, the gravity of the sliding plate 52 and the lumbar support 7 is difficult to overcome only by the friction force between the sliding plate 52 and the guide rail 51, so that the lumbar support 7 can automatically slide to the bottom of the guide rail 51 after the height adjustment is finished, and the height adjustment of the lumbar support 7 cannot be realized.

Therefore, in the present application, the sliding plate 52 is provided with the marble 521, the guide rail 51 is provided with a plurality of first through holes 511 in the longitudinal direction, and the height of the sliding plate 52 on the guide rail 51 is fixed through the cooperation of the marble 521 and one of the first through holes 511, so that the height of the lumbar support 7 on the chair back 3 is fixed. When the height of the lumbar support 7 needs to be adjusted, the marbles 521 are pressed to be contracted in the sliding plate 52 and are not matched with the first through holes 511 any more, so that the sliding plate 52 can slide up and down in the guide rail 51, when the marbles 521 move from one first through hole 511 to the position of the other first through hole 511, the marbles 521 can automatically pop out of the sliding plate 52 and are matched with the first through holes 511 to fix the sliding plate 52 on the guide rail 51 again, so that the height adjustment of the sliding plate 52 in the guide rail 51, namely the height adjustment of the lumbar support 7 on the chair back 3, is realized.

In this embodiment, the second through hole 31 is formed in the chair back 3, the length adjusting device 6 includes an adjusting rod having one end penetrating through the second through hole 31 from the outside of the chair back 3 and connected to the guide rail 51, and the adjusting rod adjusts the length of the lumbar support 7 extending from the chair back 3 when changing its length, as shown in fig. 1 and 2. Be equipped with second through-hole 31 on back of the chair 3, adjust pole one end and follow back of the 3 outsides of back of the chair and run through second through-hole 31, carry out fixed connection with guide rail 51 to through when 3 outside changes the regulation pole self lengths in the back of the chair, promote guide rail 51 and move towards the direction that is close to back of the chair 3 or keeps away from back of the chair 3, drive slide 52 and lumbar support 7 and guide rail 51 and move towards the direction that is close to back of the chair 3 or keeps away from back of the chair 3 in step, realize adjusting the length that lumbar support 7 extends from back of the chair 3.

In this embodiment, the adjusting rod includes a screw rod having an external thread and a stud 512 having a threaded hole 5121 matching with the external thread, one end of the screw rod penetrates through the second through hole 31 from the outside of the seat back 3 and then is screwed with the threaded hole 5121, and one end of the stud 512 is connected with the guide rail 51, which is shown in fig. 1 and 4. The adjusting rod comprises a screw and a stud 512, an external thread is arranged at one end of the screw penetrating through the second through hole 31 from the outside of the chair back 3, a threaded hole 5121 is formed in the stud 512, the screw and the stud 512 are screwed together through the matching of the external thread and the threaded hole 5121, and one end, far away from the screw, of the stud 512 is fixedly connected with the guide rail 51. When the screw rod is rotated outside the chair back 3, according to the transmission principle of the screw rod pair, the stud 512 screwed with the screw rod can move linearly on the screw rod, so that the whole length of the adjusting rod is changed, the guide rail 51 is pushed by the stud 512 to move towards the direction close to the chair back 3 or far away from the chair back 3, the sliding plate 52 and the lumbar support 7 are driven to move towards the direction close to the chair back 3 or far away from the chair back 3 synchronously with the guide rail 51, and the length of the lumbar support 7 extending from the chair back 3 is adjusted.

In the present embodiment, the screw includes a support portion 61 and a threaded portion 62, one end of the support portion 61 penetrates the second through hole 31 from the outside of the seat back 3 and is rotatably engaged with the second through hole 31, and the threaded portion 62 is provided at one end of the support portion 61 penetrating the second through hole 31, as shown in fig. 1 and 6. The screw is provided with the support portion 61 and the threaded portion 62, because when the screw penetrates through the second through hole 31, the inner wall of the second through hole 31 is in contact with the screw, so that the length adjusting device 6, the height adjusting device 5 and the lumbar support 7 are supported, and meanwhile, the screw rotates in the second through hole 31, so that the length of the lumbar support 7 extending from the chair back 3 is adjusted.

If the external surface of whole screw rod all sets up the external screw thread, when the screw rod runs through second through-hole 31, the external screw thread can increase with the friction between the second through-hole 31 inner wall, both influence the rotation of screw rod, can lead to the wearing and tearing of second through-hole 31 and screw rod again, influence the life of this office chair. Therefore, in the present application, when the screw penetrates through the second through hole 31 and is screwed with the stud 512, the support part 61 with a smooth outer surface is rotatably connected with the second through hole 31, and the thread part 62 with an external thread on the outer surface is screwed with the stud 512, so that friction between the screw and the inner wall of the second through hole 31 is reduced.

In this embodiment, the adjusting rod further includes a rotating handle 63 disposed at an end of the screw rod far away from the end screwed with the stud 512, and the rotating handle 63 is provided with an arc-shaped groove for facilitating rotation, and the specific effect is shown in fig. 6. Keep away from at the screw rod with the one end of double-screw bolt 512 spiro union be equipped with rotatory hand (hold) 63, be equipped with the arc recess on the rotatory hand (hold) 63, be convenient for hold, drive the screw rod through rotating rotatory hand (hold) 63 in back of the chair 3 outside and rotate to the operation that makes the length that the waist leaned on 7 follow back of the chair 3 to extend is easy to carry out more, and then makes this office chair's practicality stronger.

In this embodiment, the length adjustment device 6 further includes a bearing element 32 disposed in the second through hole 31, an outer wall of the bearing element 32 is fixedly connected to an inner wall of the second through hole 31, an insertion groove 321 is disposed on the inner wall of the bearing element 32, and a key bar 612 engaged with the insertion groove 321 is disposed on the support portion 61, which is shown in fig. 2 and fig. 6. When the supporting portion 61 penetrates through the second through hole 31, the key strip 612 is inserted into the insertion groove 321, so as to fix the inner ring of the bearing member 32 and the supporting portion 61.

The bearing piece 32 is arranged because the support part 61 is fixedly connected with the inner ring of the bearing piece 32 through the insertion fit of the key strip 612 and the insertion groove 321, and the outer wall of the bearing piece 32 is fixedly connected with the inner wall of the second through hole 31, therefore, when the support part 61 rotates, the inner ring of the bearing piece 32 rotates synchronously with the support part 61, the outer ring of the bearing piece 32 and the inner wall of the second through hole 31 keep a fixed state, so that the friction between the support part 61 and the inner wall of the second through hole 31 during rotation is further reduced, the rotation of the support part 61 is prevented from being influenced, meanwhile, the abrasion of the second through hole 31 and the support part 61 is caused, and the service life of the office chair is influenced.

In this embodiment, the supporting portion 61 is provided with a baffle 611 in the circumferential direction, and the baffle 611 abuts against a surface of the backrest 3 away from the seat 1 when one end of the supporting portion 61 penetrates through the second through hole 31 from the outside of the backrest 3, as shown in fig. 1 and 6. The baffle 611 is arranged on the circumferential direction of the supporting portion 61, when one end of the supporting portion 61 penetrates through the second through hole 31 from the outside of the chair back 3, the key strip 612 on the supporting portion 61 is inserted into the insertion groove 321 on the second through hole 31, when the key strip 612 is inserted into the insertion groove 321 in place, the baffle 611 is abutted to one surface of the chair back 3 far away from the chair seat 1, the stability of the supporting portion 61 after penetrating through the second through hole 31 is enhanced, the stability of the office chair structure is enhanced, the insertion of the key strip 612 in the insertion groove 321 can be indicated in place, and therefore the office chair is simpler and more convenient to use.

The above-described aspects may be implemented individually or in various combinations, and such variations are within the scope of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides an office chair that waist leaned on and supported which characterized in that: the chair comprises a chair seat (1) for people to sit, armrests (2) arranged on two sides of the chair seat (1) and used for supporting arms, a chair back (3) arranged at the tail end of the chair seat (1) and used for supporting the back, and chair legs (4) arranged at the bottom of the chair seat (1) and used for supporting the chair seat (1); back of the chair (3) are close to one side middle part of seat support (1) is equipped with waist that is used for carrying out the support to the waist and leans on (7), still includes height adjusting device (5) and length adjustment means (6), height adjusting device (5) are used for adjusting waist leans on (7) to be in height on back of the chair (3), length adjustment means (6) are used for adjusting waist leans on (7) to follow the length that extends on the back of the chair (3).

2. A lumbar support office chair as claimed in claim 1, wherein: the waist support (7) comprises an inner elastic supporting pad and an outer fabric.

3. A lumbar support office chair as claimed in claim 1, wherein: height adjusting device (5) are including locating guide rail (51) in back of the chair (3) middle part gliding slide (52) about in guide rail (51), and one end with slide (52) are connected, the other end with connecting rod (53) that waist leaned on (7) are connected.

4. A lumbar support office chair as claimed in claim 3, wherein: be equipped with marble (521) on slide plate (52), be equipped with a plurality of vertical first through-holes (511) that set up on guide rail (51), slide plate (52) are in when sliding from top to bottom in guide rail (51), marble (521) with first through-hole (511) cooperation.

5. A lumbar support office chair as claimed in claim 3, wherein: be equipped with second through-hole (31) on the back of the chair (3), length adjusting device (6) include that one end is followed the back of the chair (3) outside is run through behind second through-hole (31), with the regulation pole that guide rail (51) are connected, adjust when changing self length waist leans on (7) to follow the length that extends on the back of the chair (3).

6. A lumbar support office chair as claimed in claim 5, wherein: adjust the pole including the screw rod that is equipped with the external screw thread to and be equipped with double-screw bolt (512) of external screw thread complex screw hole (5121), screw rod one end is followed back of the chair (3) outside is run through behind second through-hole (31) with screw hole (5121) spiro union, double-screw bolt (512) one end with guide rail (51) are connected.

7. A lumbar support office chair as claimed in claim 6, wherein: the screw rod includes supporting part (61) and screw thread portion (62), supporting part (61) one end is followed back of the chair (3) outside is run through when second through-hole (31), with second through-hole (31) normal running fit, screw thread portion (62) are located supporting part (61) run through the one end of second through-hole (31).

8. A lumbar support office chair as claimed in claim 6, wherein: the adjusting rod further comprises a rotary handle (63) which is arranged at one end, far away from the screw, of the threaded end of the stud (512), and an arc-shaped groove convenient to rotate is formed in the rotary handle (63).

9. A lumbar support office chair as claimed in claim 7, wherein: the length adjusting device (6) further comprises a bearing piece (32) arranged in the second through hole (31), the outer wall of the bearing piece (32) is fixedly connected with the inner wall of the second through hole (31), an inserting groove (321) is formed in the inner wall of the bearing piece (32), and a key strip matched with the inserting groove (321) is arranged on the supporting portion (61).

10. A lumbar support office chair as claimed in claim 7, wherein: supporting portion (61) circumference is equipped with baffle (611), baffle (611) are in supporting portion (61) one end is followed back of the chair (3) outside runs through when second through-hole (31), with back of the chair (3) keep away from the one side butt of seat support (1).

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