CN111493574A

CN111493574A - Long-stroke lumbar support mechanism and seat

Info

Publication number: CN111493574A
Application number: CN202010446242.9A
Authority: CN
Inventors: 倪良正; 张叙俊; 毛立; 孙杰; 邱裕峰; 高宏杰; 杜修兵
Original assignee: Zhejiang Sunon Furniture Manufacturing Co Ltd
Current assignee: Zhejiang Sunon Furniture Manufacturing Co Ltd
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2020-08-07

Abstract

The invention discloses a long-stroke lumbar support mechanism and a seat, wherein the long-stroke lumbar support mechanism comprises a back support piece, a back support and a support adjusting mechanism, the back support piece is arranged on the front side of the back support, the upper part of the back support piece is connected with the upper end of the back support, the lower end of the back support piece moves relative to the back support in an opening and closing manner, and the support adjusting mechanism is arranged between the back support piece and the back support and supports the back support piece to stay at a corresponding position; a chair comprises a chair seat and the long-stroke lumbar support mechanism, has the functions of back-tracking and waist-supporting, and is better in comfort; compared with the prior art, the lumbar support device has longer lumbar support stroke, so that the lower end of the back support member can be attached to a lumbar part at a plurality of positions, the comfort is improved, and the occurrence of lumbar diseases is slowed down; the multi-component combination is adopted, so that the cost is low, the modularization degree is high, the application range is wide, the assembly is simple and rapid, and the production efficiency is improved; when the lower end of the back support piece moves forwards, the included angle between the whole support adjusting assembly and the horizontal plane is reduced.

Description

Long-stroke lumbar support mechanism and seat

Technical Field

The invention relates to the field of office furniture, in particular to a long-stroke lumbar support mechanism and a seat.

Background

With the rapid development of science and technology and the increasing social pressure, health has become an important topic of increasing social attention. Although the science and technology liberates the physical labor, people get involved in mental labor of long-time sitting on a desk, the number of groups of long-time sitting in China is increased continuously, the positions of the buttocks of the people in the long-time sitting can be adjusted continuously to ensure the comfort of sitting, and when a user works, the user sits in the front two thirds position of the seat cushion most of the time, and the waist and the back of the user can not be supported by the backrest. With the increase of people, various age-incompatible waist diseases caused by sedentary behaviors are generated.

The chair for adjusting the lumbar support on the market generally has the problem that the adjusting stroke of the lumbar support is short.

The Chinese patent of CN201820253966.X discloses a chair with a waist rest adjusting function, which comprises a chair back, a chair seat and bottom feet, wherein a cavity is arranged on the chair back, a supporting body is arranged at the upper part in the cavity through a lifting and folding device, the lifting and folding device comprises a fixed seat and a connecting arm, a fixed arm is arranged on the fixed seat, the fixed arm is hinged with the connecting arm, at least two connecting arms are fixed and move synchronously through a rigid connecting block, the fixed seat is fixed with the chair back, and the rigid connecting block is fixed with the supporting body. The chair back is provided with the cavity, the supporting piece is arranged in the cavity, the chair back is hinged with the folding device, and the pawl and the ratchet wheel are used for positioning and supporting, so that the lumbar support adjustment of the chair back is realized. The invention realizes the waist support adjustment by changing the structure of the chair back, and has high cost; the chair back can only be used for chair backs with thickness, such as the chair backs of leather chairs, and has limitation; the ratchet mechanism is added in the device, so that the device is difficult to assemble and is not suitable for modularized assembly production.

CN201810323197.0, a chinese patent of the invention discloses an ergonomic chair, which comprises a chair back assembly and a chair seat assembly, wherein the chair back assembly comprises an upper back support, a lower back support, a chair back frame which elastically deforms under the action of traction or extrusion, and a locking mechanism which relatively fixes the positions of the three components; the back lower support is connected with the seat component through a connecting rod, the lower end of the back upper support is rotatably connected with the upper end of the back lower support, and the upper end and the lower end of the back frame are respectively hinged with the upper part of the back upper support and the lower part of the back lower support. The upper half back frame of the invention rotates forwards, and the whole elastic frame is extruded to support the waist and the back forwards, thereby adjusting the support of the waist but having shorter stroke; and the seat depth is adjusted by overcoming the elasticity of the elastic frame and keeping the adjusted position to lock the upper and lower brackets, which is troublesome to operate and difficult to lock to a position comfortable for users.

Disclosure of Invention

In order to solve the technical problems, the invention provides a long-stroke lumbar support mechanism, which is characterized by comprising a back support piece, a back support and a support adjusting mechanism, wherein the back support piece is arranged at the front side of the back support; back support piece upper portion is connected in back support upper end, and back support piece lower extreme opens and shuts the motion for back support, supports adjustment mechanism and supports back support piece and stop at the relevant position.

Further, a chair is provided, which comprises a chair seat and the long-stroke lumbar support mechanism, has the function of back-tracking and waist-supporting, and is more comfortable.

The technical scheme of the invention is realized as follows:

a long stroke lumbar support mechanism comprising:

a back bracket configured to support a body of the back support;

the back support is arranged on the front side of the back bracket and is configured to support the waist and the back of a human body; the upper part of the back support is connected with the upper end of the back support, the lower end of the back support moves relative to the back support in an opening and closing manner, and when the lower end of the back support is opened forwards, a large included angle is formed between the whole back support and the back support; when the lower end of the back support piece is closed backwards, a smaller included angle is formed between the whole back support piece and the back support;

and the support adjusting mechanism is arranged between the back support and is connected to the lower part of the back support and is configured to support and stop the back support at a corresponding position.

The connecting point of the back support and the back support piece is arranged on the upper part, so that the back support piece can be more attached to the supporting surface of the back support piece when the back of the waist and the back of a human body leans against, the opening and closing movement amplitude of the lower end of the back support piece is larger, namely, the stroke is longer, the effect that the lower end of the back support piece backs up to push the back to the waist is realized, and the back support piece is supported and stopped at the.

Preferably, the upper part of the back bracket is rotatably connected with the upper end of the back support piece through a ball head or a rotating shaft. This has realized that back support piece lower extreme can rotate around the tie point of back support piece and back support piece to reach the effect of opening and shutting and in order to adjust the whole contained angle with the back support piece of back support piece, make back support piece laminate human back and back in different positions.

Preferably, back support upper portion is connected through grafting slewing mechanism with back support piece upper end, and grafting slewing mechanism includes accepting portion and grafting portion, and accepting portion and grafting portion are to inserting back joint cooperation, and both pass through unsmooth cambered surface normal running fit. The mode saves the cost of parts, accelerates the assembly process, improves the production efficiency and reduces the labor capacity of workers.

Preferably, the insertion part comprises an insertion column and a column base, the tail part of the insertion column is fixedly arranged on the column base, the head part of the insertion column is provided with a clamping hook, the bearing part is provided with an insertion hole, a hook platform is arranged in the insertion hole, and when the bearing part is in clamping fit with the insertion part, the insertion column is inserted into the insertion hole until the clamping hook hooks the hook platform; a first concave cambered surface is formed on the surface of the column base facing the bearing part; the bearing part on the face towards the column base form the second cambered surface of evagination, the jack is seted up on the second cambered surface, after grafting portion and bearing part joint cooperation, first cambered surface and second cambered surface counterbalance lean on and normal running fit. The arrangement of the bearing part and the insertion part realizes the connection and the rotation fit of the back support piece and the back bracket.

Preferably, the supporting and adjusting assembly can be any one of an electric push rod, an air rod or a hydraulic rod, two ends of the supporting and adjusting assembly are respectively connected with the back support and the back support in a rotating manner, and the inclination angle of the supporting and adjusting assembly relative to the horizontal plane changes along with the opening and closing movement of the back support. The common and universal accessories such as the electric push rod, the air rod or the hydraulic cylinder are used as the supporting and adjusting component, so that the development cost is saved, and the function of the supporting and adjusting component can be realized.

Preferably, the support adjusting assembly comprises a first support seat and a second support seat, and the first support seat and the second support seat generate relative movement when the back support moves in an opening and closing manner; the clamping mechanism is arranged between the first supporting seat and the second supporting seat, when the back supporting piece is opened forwards, the clamping mechanism keeps the position of the first supporting seat and the second supporting seat after relative movement, the clamping mechanism comprises a rack, a clamping tongue and a spring, a plurality of clamping grooves are distributed on the rack along the length direction, and the clamping tongue rotates around a pivot and keeps the trend of clamping with the clamping grooves under the action of the spring. Supporting and holding the back support in the respective position is achieved.

Preferably, the clamping mechanism further comprises a tongue seat and a limiting piece, the clamping tongue is connected to the tongue seat, and the tongue seat is connected with the pivot; the rack comprises a clamping tooth section, a plurality of clamping teeth are distributed on the clamping tooth section along the length direction, and a clamping groove is formed between every two clamping teeth; a clamping tongue jacking and holding section and a rotary boss are respectively formed at two ends of the clamping tooth section of the rack along the length direction, and the heights of the clamping tongue jacking and holding section and the rotary boss are both greater than the height of the clamping tooth section along the thickness direction of the rack; the tongue base is also provided with a locking tongue matched with the limiting piece, when the clamping tongue is positioned at the clamping tooth section, the clamping tongue is in clamping fit with the clamping groove at the corresponding position, and the limiting piece does not limit the locking tongue; when the clamping tongue abuts against the clamping tongue jacking and maintaining section, the clamping tongue rotates towards the direction leaving the clamping groove, the limiting piece locks the locking tongue and enables the clamping tongue to maintain the unlocking state of being disengaged from the clamping groove, and when the first supporting seat and the second supporting seat move relatively, the limiting piece crosses over the clamping tooth section and touches the rotary boss, so that the clamping tongue rotates reversely to be clamped with the clamping groove, and the locking tongue is disengaged from the limiting piece. The clamping grooves are matched with the clamping grooves at corresponding positions, and at the moment, the lower end of the back support can be continuously opened forwards but cannot be drawn back, so that the back support is supported by the support adjusting mechanism; after the first supporting seat and the second supporting seat move relatively, the clamping tongue can be clamped with different clamping grooves, so that the back supporting piece is supported and kept at a corresponding position by the supporting and adjusting mechanism; the clamping tongue jacks up the holding section to enable the clamping tongue to rotate excessively, and the limiting piece can lock the locking tongue, so that the lower end of the back support piece can be drawn back and cannot be supported; the rotary boss can unlock the locked clamping tongue so as to be clamped with the clamping groove again and recover the support of the support adjusting mechanism to the back support piece; the structure is ingenious.

Preferably, the height of the clamping tongue jacking and holding section in the thickness direction of the rack is lower than that of the rotary boss. The arrangement is used for preventing the clamping tongue from directly crossing the rotary boss after being jacked and locked, so that the rotary boss is invalid.

Preferably, the locking tongue and the limiting part are staggered all the time, and when the locking tongue rotates, the locking tongue goes over the limiting part through elastic deformation and is abutted to the limiting part to be locked or is separated from the limiting part to be unlocked. The locking mode is simple and effective, an independent mechanism is not needed for locking the clamping tongue, the tongue seat and the locking tongue, and cost and assembly time are saved.

Preferably, at least one of the limiting member and the locking tongue is an elastic member.

Preferably, the first support seat is a hollow sleeve, and the rack is fixedly arranged in the first support seat; the clamping tongue, the tongue seat, the spring and the limiting piece are arranged on the second supporting seat, and the first supporting seat is in sleeve fit with the second supporting seat; the second supporting seat is rotatably connected with the back support, and the first supporting seat is rotatably connected with the back support. When the lower end of the back support frame is required to move in an opening and closing manner, the first support seat and the second support seat move relatively along with the back support frame, and the first support seat and the second support seat are required to be respectively connected with the back support piece and the back support frame in a rotating manner.

Preferably, the spring is a torsion spring, the tongue base is rotatably connected with the second support base through a pivot, the torsion spring is sleeved on the pivot, the first torsion arm and the second support base of the torsion spring are kept relatively fixed, and the second torsion arm of the torsion spring acts on the tongue base. The torsion spring is used for returning the clamping tongue, so that the clamping tongue can be clamped with the corresponding clamping groove all the time after the first supporting seat and the second supporting seat move relatively.

Preferably, the limiting member is a plate-shaped body which is fixedly mounted on the second supporting body, and one end of the limiting member is suspended to form a limiting part matched with the locking tongue. When the limiting part locks the clamping tongue, the limiting part props against the locking tongue to resist the elasticity of the torsion spring.

Preferably, the supporting and adjusting assembly is inclined upwards between the back support and the back support piece from back to front, and when the lower end of the back support piece moves forwards, the included angle between the whole supporting and adjusting assembly and the horizontal plane is reduced. The effective supporting force of the supporting and adjusting assembly to the back supporting piece is larger, and the structure is more stable.

Preferably, the back support comprises an upper back component and a lower back component which are of frame structures, one end of the supporting and adjusting component is connected to the lower portion of the back support, the other end of the supporting and adjusting component is connected to the upper back component, and the upper back component and the lower back component are in elastic connection. The upper back component and the lower back component respectively support the back and the waist of a human body, so that the design of the upper back component and the lower back component can be more targeted, and the use comfort of the seat is further improved; the support adjusting component is connected to the upper back component and the lower back component are elastically connected, so that when a user leans against the lower back component, the lower back component can be attached to the waist and the back in different postures, and the comfort of the seat is improved.

Preferably, the elastic connection mode adopted between the upper back assembly and the lower back assembly is as follows: the upper back component and the lower back component are connected through a spring steel sheet.

Preferably, the elastic connection mode adopted between the upper back assembly and the lower back assembly is as follows: the upper back component is rotationally connected with the lower back component, and a return spring is arranged between the upper back component and the lower back component.

Preferably, the back support comprises an upper back component and a lower back component which are of frame structures, one end of the supporting and adjusting component is connected to the lower portion of the back support, the other end of the supporting and adjusting component is connected to the lower back component, and the upper back component and the lower back component are in rigid connection. The supporting and adjusting component is connected with the lower back component, the supporting and adjusting mechanism obliquely and forwards supports the back supporting component, the included angle between the supporting and adjusting mechanism and the horizontal plane is smaller when the supporting and adjusting mechanism is connected with the upper back component, and the supporting force is stronger.

Preferably, the rigid connection mode adopted between the upper back assembly and the lower back assembly is as follows: the upper back component and the lower back component are connected through a steel plate.

Preferably, the back support is a column support, a gap is always reserved between the lower end of the back support and the back support, the width of the back support is larger than that of the back support, and the support adjusting assembly is arranged at the middle position in the width direction of the back support. The back support component arm back support is narrower, so that the support surface of the back support component for supporting the waist and the back is larger, the comfort is improved, and the structure is attractive.

Preferably, the connection position of the back bracket and the back support is 50-60cm away from the lower end of the back support. The lower end of the back support is far away from the joint of the back bracket and the back support, so that the stroke of the opening and closing movement of the back support is longer.

A chair comprises a chair seat and the long-stroke lumbar support mechanism, wherein the lower end of a back support is directly or indirectly connected to the chair seat. The position that this seat accessible back support piece's opening and shutting motion adjustment lumbar support realizes following the effect of back and pushing up the waist, and the travelling comfort improves.

The design starting point, the idea and the beneficial effects of the invention adopting the technical scheme are as follows:

the invention provides a long-stroke lumbar support mechanism and a seat, compared with the prior art, the long-stroke lumbar support mechanism comprises:

1. the lower end of the back support piece can move in an opening and closing mode and is far away from the connecting position of the back support piece and the back support, so that the support mechanism has a longer lumbar support stroke, the lower end of the back support piece can be attached to the back of the waist at more different positions, the comfort is improved, and the occurrence of lumbar diseases is slowed down.

2. The supporting mechanism does not need to change the structure of the chair back, but adopts the mode that the back support is separated from the back support piece and is connected through the support adjusting component to be combined, so that the cost is low, the modularization degree is high, the application range is wide, the assembly is simple and quick, and the improvement of the production efficiency is facilitated.

3. The support adjusting mechanism is close to a human body, the adjustment is convenient, when an air rod, an electric push rod or a hydraulic rod is used, only a button needs to be pressed, and a bolt does not need to be screwed; when the supporting and adjusting mechanism comprising the first supporting seat and the second supporting seat is adopted, the back supporting piece is only required to be pulled to carry out the supporting and adjusting of the waist and the back, and the supporting and adjusting mechanism has self-locking capacity.

4. The back support and the back support piece are connected with each other through the connecting part and the inserting part in a plugging and rotating matched mode, so that the cost of parts is saved, the assembly process is accelerated, the production efficiency is improved, and the labor amount of workers is reduced.

5. The supporting and adjusting assembly is inclined upwards between the back support and the back support piece from back to front, and when the lower end of the back support piece moves forwards, the included angle between the whole supporting and adjusting assembly and the horizontal plane is reduced; the effective supporting force of the supporting and adjusting assembly to the back supporting piece is larger, and the structure is more stable.

6. One end of the supporting and adjusting mechanism is connected to the back support, the other end of the supporting and adjusting mechanism is connected to the back support, and when the supporting and adjusting mechanism is connected to the upper back, the lower back has elastic buffering; when the supporting and adjusting mechanism is connected with the lower back, the supporting and adjusting mechanism obliquely supports the chair back in front, and the included angle between the supporting and adjusting mechanism and the horizontal plane is smaller than that between the supporting and adjusting mechanism and the upper back component, so that the supporting force is stronger.

7. When the open type chair back combined by the back support and the back support is used, even if the air rod or the electric push rod is used for jacking or falling back the back support, the appearance is monotonous and is not aesthetic when the air rod or the electric push rod is exposed outside due to fixed shape; in order to solve the problems, the support adjusting assembly is in a sleeved mode, the first supporting seat and the second supporting seat are fixed in a clamping mode, the outer shapes of the first supporting seat and the second supporting seat can be adjusted correspondingly according to the overall style of the seat, and therefore the attractiveness is improved, for example, the seat is designed to be in a cuboid shape or patterns are added on the appearance of the seat.

8. The support adjustment assembly of the present invention is used with a shorter initial length and smaller volume than a gas stick for the same stroke.

Drawings

FIG. 1 is a schematic perspective view of a combination of a back support, a back support and a support adjustment assembly according to an embodiment of the present invention;

FIG. 2 is a side view of an embodiment of the present invention with the back support and support adjustment assembly adjusted;

FIG. 3 is a perspective view of a back support and back bracket assembly according to an embodiment of the present invention;

FIG. 4 is a perspective view of a back support in an embodiment of the present invention;

FIG. 5 is a schematic perspective view of a back support according to an embodiment of the present invention;

FIG. 6 is a perspective view of a back support and a back support assembly according to an embodiment of the present invention;

FIG. 7 is a cross-sectional view of a back bracket and back support combination in an embodiment of the invention;

FIG. 8 is an enlarged view of portion A of FIG. 7;

FIG. 9 is a schematic perspective view of an embodiment of the present invention illustrating the back support being adjusted to extend the support adjustment assembly;

FIG. 10 is a schematic perspective view of a support adjustment assembly according to an embodiment of the present invention;

FIG. 11 is a schematic perspective view of the embodiment of the present invention illustrating the engagement between the latch and the slot;

FIG. 12 is a cross-sectional view of the support adjustment assembly with the latch tongue positioned in the primary slot in an embodiment of the present invention;

FIG. 13 is an enlarged view of portion B of FIG. 12;

FIG. 14 is a cross-sectional view of the support adjustment assembly with the latch engaging the slot in an embodiment of the present invention;

FIG. 15 is an enlarged view of portion C of FIG. 14;

FIG. 16 is a cross-sectional view of the support adjustment assembly after the locking tongue is locked by the stop portion in an embodiment of the present invention;

FIG. 17 is an enlarged view of portion D of FIG. 16;

FIG. 18 is a cross-sectional view of the support adjustment assembly with the latch being set back by a surface of revolution in an embodiment of the invention;

FIG. 19 is an enlarged view of section E of FIG. 18;

FIG. 20 is an exploded view of a first support adjustment assembly in an embodiment of the present invention;

FIG. 21 is an exploded view of a second support adjustment assembly in an embodiment of the present invention;

FIG. 22 is a first perspective view illustrating a rack and a second support base according to an embodiment of the present invention;

FIG. 23 is a second schematic perspective view illustrating a rack and a second support seat according to an embodiment of the present invention;

FIG. 24 is a side view of a seat with the back support unadjusted in an embodiment of the present invention;

fig. 25 is a side view of a back support adjusted rear seat in an embodiment of the present invention.

The figures are numbered: a back support 1; a back support 2; a support adjustment assembly 101; a plug-in rotation mechanism 16; a receiving part 3; a plug-in part 4; a hook 5; a jack 6; a column base 7; an elastic buckle 8; a hook-free elastic sheet 9; a hook buckle 10; a hook platform 11; an entry end 12; a first arc surface 13; a second cambered surface 14; a first support 102; a second support seat 103; a rack 104; a latch tongue 105; a card slot 106; a pivot 107; a torsion spring 108; a latch section 109; a latch 110; a self-locking face 111; a sliding surface 112; a tongue base 113; a locking tongue 114; an elastic sheet 115; a stopper portion 116; a latch jack-up retention section 117; a swivel boss 118; a jacking surface 119; a last stage card slot 120; a surface of revolution 121; a primary card slot 122; a first torsion arm 123; a second torque arm 124; an upper back assembly 125; a lower back assembly 126; a seat 127; a chassis 128; and a tip 129.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more than one unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific embodiment of the invention is as follows:

most of chairs for adjusting lumbar support in the market rely on the addition of a separate lumbar support part on the chair back to carry out lumbar support and adjustment, but the chairs have the problems of abrupt appearance, poor comfort due to the fact that the chair only supports one part of the waist, short adjustment stroke of the lumbar support part and the like; it is the intention of this invention to achieve an aesthetically pleasing, comfortable seat with long travel lumbar support adjustment.

As shown in fig. 1 and 2, the present invention provides a long-stroke lumbar support mechanism, which comprises a back bracket 1, a back support 2 and a support adjustment assembly 101.

The back support 1 is configured to support the main body of the back support 2, the back support 2 is arranged at the front side of the back support 1, and is configured to support the waist and back of a human body, and a back cushion can be wrapped or a mesh cloth can be laid at the front side of the back support 2; the upper part of the back support 1 is connected with the upper end of the back support 2, the lower end of the back support 2 moves relative to the back support 1 in an opening and closing way, and when the lower end of the back support 2 opens forwards, a larger included angle is formed between the whole back support 2 and the back support 1; when the lower end of the back support piece 2 is drawn back, a smaller included angle is formed between the whole back support piece 2 and the back bracket 1; the support adjusting assembly 101 is disposed between the back support 1 and the back support 2 and the support adjusting assembly 101 is connected to a lower portion of the back support 1 and configured to support the back support 2 to stay at a corresponding position.

The upper part of the back bracket 1 is rotatably connected with the upper end of the back support 2, and the connection can be realized through a ball head or a rotating shaft, which is simpler and not described in detail herein; it can also be connected by a plug-in rotation mechanism 16, for example as follows:

as shown in fig. 3, the inserting rotation mechanism 16 is disposed between the back support 1 and the back support 2, the inserting rotation mechanism 16 includes a receiving portion 3 and an inserting portion 4, the receiving portion 3 and the inserting portion 4 are matched with each other in a clamping manner after being inserted, and the receiving portion 3 and the inserting portion 4 are matched with each other in a rotation manner through a concave-convex arc surface, so as to realize the relative rotation of the back support 1 and the back support 2.

As shown in fig. 4, the inserting part 4 comprises an inserting column, a hook 5 is arranged at the head of the inserting column, and an inserting hole 6 is arranged on the inserting part 4; when the back support 1 is assembled with the back support 2, the plug post is inserted into the plug hole 6, so that the hook 5 is in clamping fit with the plug part 4, specifically:

as shown in fig. 4-8, the two insertion parts 4 are arranged at the upper end of the back bracket 1 at intervals towards the front left and right, the insertion parts 4 and the back bracket 1 are integrally formed, and each insertion part 4 comprises a post base 7 extending forwards from the back bracket 1 and an insertion post arranged on the post base 7; the inserted column is an elastic buckle 8, the elastic buckle 8 comprises a hook-free elastic sheet 9 and a buckle with a hook 10, the hook-free elastic sheet 9 and the buckle with the hook 10 are arranged on the column base 7 at an interval from top to bottom, the hook-free elastic sheet 9 is positioned above the buckle with the hook 10, and the hook 5 is a trapezoidal boss formed by downward extending the head of the buckle with the hook 10; the bearing part 3 is arranged at the upper end of the back support part 2 towards the rear corresponding to the plug-in part 4, the bearing part 3 is formed by extending the back support part 2 and is integrally formed with the back support part 2, a hook platform 11 is arranged in a jack 6 which is arranged on the bearing part 3 towards the elastic buckle 8, and the height of the hook platform 11 is higher than that of the hook 5; when the inserting part 4 is in clamping fit with the bearing part 3, the elastic buckle 8 is inserted into the jack 6, and the hook platform 11 blocks the jack, so that the height of an inlet end 12 of the jack 6 is smaller than the thickness from the upper surface of the unhooked elastic sheet 9 to the lowest end of the hook 5, and the buckle with the hook 10 and the unhooked elastic sheet 9 have elasticity, so that the buckle with the hook 10 and the unhooked elastic sheet 9 are extruded by the hook platform 11 to be mutually close and bent; the elastic buckle 8 continues to go deep into the jack 6 until the hook 5 leaves the hook platform 11, the hook-free elastic sheet 9 and the buckle with the hook 10 are deformed due to elastic recovery, and the hook 5 hooks the hook platform 11.

And the hook platform 11 is positioned on the lower surface of the inlet end 12 of the insertion hole 6, the length of the insertion hole 6 behind the hook platform 11 is longer than the front-back length of the hook 5, and the length of the insertion hole 6 is longer than the length of the elastic buckle 8, so that the hook 5 is prevented from protruding out to the surface of the back support member 2.

The rotation fit of the bearing part 3 and the inserting part 4 is as follows:

a first cambered surface 13 is formed on the surface of the column base 7 facing the bearing part 3, and the first cambered surface 13 is a smooth arc curved surface which is inwards concave from the upper end and the lower end to the middle; the bearing part 3 towards the face of column base 7 form the second cambered surface 14, the second cambered surface 14 is the smooth circular arc curved surface that is evaginated to the centre from upper and lower both ends, and the jack 6 is seted up on the second cambered surface 14, and after grafting portion 4 and the joint cooperation of bearing part 3, first cambered surface 13 leaned on and normal running fit with second cambered surface 14.

The bearing part 3 and the inserting part 4 which are integrally formed on the back support piece 2 and the back support 1 are connected, so that parts for connection are omitted, the part cost is saved, the assembly is quick and simple, the workload of workers is reduced, and the production efficiency is improved.

The back support member 2 can rotate relative to the back support frame 1, and then the support adjusting assembly 101 supports and keeps the back support member 2 at a corresponding position after rotating, so that the adjustment of the lumbar support can be realized; two ends of the supporting and adjusting assembly 101 are respectively connected with the back support 1 and the back support 2 in a rotating manner, and the inclination angle of the supporting and adjusting assembly 101 relative to the horizontal plane changes along with the opening and closing movement of the back support 2.

Since the electric push rod, the air rod and the hydraulic cylinder are all common, the case that the supporting and adjusting component is the electric push rod, the air rod or the hydraulic rod is not illustrated in detail in the embodiment; in order to make the supporting and adjusting assembly 101 have a strong supporting force without on-off control, the supporting and adjusting assembly 101 is designed as follows:

as shown in fig. 1 and 9-23, the support adjustment assembly 101 includes a first support seat 102 rotatably connected to the back support 2 and a second support seat 103 rotatably connected to the back support 1, wherein the first support seat 102 and the second support seat 103 move relatively when the back support 2 moves in an opening and closing manner; the first supporting seat 102 is a hollow sleeve, the first supporting seat 102 is sleeved on the second supporting seat 103, and the supporting and adjusting assembly 101 extends and retracts when the back supporting piece 2 moves in an opening and closing manner; a clamping mechanism is arranged between the first supporting seat 102 and the second supporting seat 103, the clamping mechanism is configured to keep the positions of the first supporting seat 102 and the second supporting seat 103 after relative movement when the back supporting member 2 is opened forwards, the clamping mechanism comprises a rack 104, a clamping tongue 105 and a spring, a plurality of clamping grooves 106 are distributed on the rack 104 along the length direction, and the clamping tongue 105 rotates around a pivot 107 and keeps the trend of clamping with the clamping grooves 106 under the action of the spring; the spring is a torsion spring 108; the clamping mechanism mainly plays a role in enabling the supporting and adjusting assembly 101 to have the self-locking capability of supporting the back support 2 when the supporting and adjusting assembly 101 leans against the back support 2 backwards at the waist and back, but the clamping mechanism does not have the self-locking capability of enabling the supporting and adjusting assembly 101 to be self-locked when the back support 2 is unfolded.

The rack 104 is installed in the first support seat 102 and comprises a latch section 109, a plurality of latches 110 are distributed on the latch section 109 along the length direction, a slot 106 is formed between every two latches 110, the latches 110 are right-angled trapezoidal, each latch 110 comprises a sliding surface 112 and a self-locking surface 111 perpendicular to the relative movement direction of the first support seat and the second support seat, the sliding surface 112 on the same latch 110 is inclined relative to the self-locking surface 111, an included angle between the two is an acute angle, and the sliding surface 112 is closer to the back support member 2 relative to the self-locking surface 111; the latch 105 is in a triangular prism shape and comprises a tip 129, the tip 129 of the latch 105 is clamped into the slot 106 and is in clamping fit with the slot 106, when the waist and back lean against the back support 2 backwards, the support adjusting assembly 101 has a contraction trend, that is, the first support seat 102 has a backward movement trend relative to the second support seat 103, at this time, the self-locking surface 111 abuts against the tip 129 of the latch 105, and the latch 105 prevents the first support seat 103 from moving backwards, that is, self-locking of the support adjusting assembly 101 during contraction is completed; when the back support member 2 is pulled to open by one stage, the support adjusting assembly 101 extends by one stage, that is, the first support seat 102 moves forward by one stage relative to the second support seat 103, and in the process, the sliding surface 112 slides relative to the latch 105 until the latch 105 is latched into the next latch groove 106; each stage of the back support 2 opening corresponds to one of the slots 106.

The clamping mechanism further comprises a tongue seat 113 and a limiting piece, the clamping tongue 105 is connected to the tongue seat 113, the tongue seat 113 is sleeved on the pivot 107, the tongue seat 113, the clamping tongue 105 and the torsion spring 108 are arranged on the second support seat 103, the torsion spring 108 is sleeved on the pivot 107, the first torsion arm 123 of the torsion spring 108 and the second support seat 103 are kept relatively fixed, and the second torsion arm 124 of the torsion spring 108 acts on the tongue seat 113, so that the tongue seat 113 can be restored to an initial position after rotating around the pivot 107; the tongue base 113 is also provided with a locking tongue 114 matched with the limiting piece, the locking tongue 114, the tongue base 113 and the clamping tongue 105 are integrally formed, and an included angle of 130 degrees is formed between the locking tongue 114 and the clamping tongue 105; the limiting member is a plate-shaped elastic sheet 115 fixed on the second supporting body, the elastic sheet 115 and the locking tongue 114 are always staggered, and one end of the elastic sheet 115 is suspended to form a limiting portion 116 matched with the locking tongue 114.

Along the length direction, the rack 104 is respectively provided with a clamping tongue jacking and holding section 117 and a rotary boss 118 at two ends of the clamping tooth section 109; along the thickness direction of the rack 104, the heights of the clamping tongue jacking and holding section 117 and the rotary boss 118 are both greater than the height of the clamping tooth section 109, and the height of the rotary boss 118 is greater than the height of the clamping tongue jacking and holding section 117; the latch jacking and holding section 117 comprises a jacking surface 119 parallel to the sliding surface 112, and a final clamping groove 120 is formed between the jacking surface 119 and the last clamping tooth of the clamping tooth section 109; the rotary boss 118 comprises a rotary surface 121 parallel to the self-locking surface 111, and a primary clamping groove 122 is formed between the rotary surface 121 and the first clamping tooth of the clamping tooth section 109; when the latch tongue 105 is located on the latch section 109, the latch tongue 105 is in clamping fit with the corresponding position of the latch groove 106, and the limiting part 116 of the elastic sheet 115 does not limit the locking tongue 114; when the tip 129 of the latch tongue 105 relatively moves backwards from the last-stage card slot 120, the tip 129 abuts against the jacking surface 119 of the latch tongue jacking and holding section 117 to enable the latch tongue 105 to rotate towards the direction away from the card slot 106, the locking tongue 114 rotates along with the latch tongue 105, passes over the limiting part 116 of the elastic sheet 115 and abuts against the limiting part 116 to be locked, and the latch tongue 105 is enabled to keep the unlocking state of being disengaged from the card slot 106; at this time, the tip 129 of the latch 105 crosses over the latch section 109 when the support adjusting assembly 101 contracts, the tip 129 of the latch 105 touches the revolution surface 121 of the revolution boss 118, the latch 105 is urged to rotate reversely to be latched with the primary latch groove 122, and the locking latch 114 also rotates reversely to pass through the elastic piece 115 and disengage from the limiting part 116 of the elastic piece 115.

As shown in fig. 2, from back to front, the supporting and adjusting assembly 101 is inclined upward between the back support 1 and the back support member 2, and when the lower end of the back support member 2 moves forward, the included angle between the whole supporting and adjusting assembly 101 and the horizontal plane becomes smaller, so that the effective supporting force of the supporting and adjusting assembly 101 to the back support member 2 is larger, and the structure is more stable.

The supporting and adjusting mechanism is close to a human body, and is convenient to adjust, and the waist and back supporting and adjusting can be carried out only by pulling the back supporting piece 2 because the supporting and adjusting mechanism has the self-locking capability in the contraction direction and does not have self-locking in the extension direction.

The back support 2 comprises an upper back component 125 and a lower back component 126 which are both in a frame type structure, the support adjusting component 101 can be connected to the lower back component 126 and connected with the upper back component and the lower back component by spring steel sheets, so that when the waist and the back lean against the lower back component 126, the lower back component 126 can be attached to the waist and the back in different postures, and the comfort of the seat is improved; however, in this embodiment, as shown in fig. 1 and 2, one end of the supporting and adjusting assembly 101 is connected to the lower portion of the back support 1, the other end of the supporting and adjusting assembly 101 is connected to the lower back assembly 126, the upper back assembly 125 and the lower back assembly 126 are connected and fixed by a steel plate, and the supporting and adjusting mechanism is inclined to the front to support the back support assembly, and its included angle with the horizontal plane is smaller and the supporting force is stronger when it is connected to the upper back assembly 125.

As shown in fig. 3 and 4, the back support 1 is a column support, a space is always left between the lower end of the back support 2 and the back support 1, the width of the back support 2 is greater than that of the back support 1, and the support adjusting assembly 101 is arranged at the middle position along the width direction of the back support 2, so that the appearance is beautiful and unobtrusive, and the user can lean more comfortably; the distance between the connection part of the back support 1 and the back support 2 and the lower end of the back support 2 is 50-60cm, so that the lower end of the back support 2 has a larger stroke during the opening and closing movement.

As shown in fig. 24 and 25, a chair comprises a seat 127 and the long-stroke lumbar support mechanism, wherein the lower end of a back bracket 1 is connected to the chair through a chassis 128; when the lower end of the back support piece 2 moves in an opening and closing way, the lower end of the back support piece 2 has a longer stroke in the seat depth direction so as to be attached to the waist and back of a human body in different seat depths.

Claims

1. A long stroke lumbar support mechanism characterized by comprising:

a back bracket configured to support a body of the back support;

and the supporting and adjusting assembly is arranged between the back support and is connected to the lower part of the back support and is configured to support and stop the back support at a corresponding position.

2. The long travel lumbar support mechanism of claim 1, wherein: the upper part of the back bracket is rotationally connected with the upper end of the back support piece through a ball head or a rotating shaft.

3. The long travel lumbar support mechanism of claim 1, wherein: back support upper portion is connected through grafting slewing mechanism with back of the body support piece upper end, and grafting slewing mechanism includes accepting portion and grafting portion, and accepting portion and grafting portion are to inserting back joint cooperation, and both are through unsmooth cambered surface normal running fit.

4. The long travel lumbar support mechanism of claim 3, wherein: the inserting part comprises an inserting column and a column base, the tail part of the inserting column is fixedly arranged on the column base, the head part of the inserting column is provided with a clamping hook, the bearing part is provided with an inserting hole, a hook platform is arranged in the inserting hole, and when the bearing part is clamped and matched with the inserting part, the inserting column is inserted into the inserting hole until the clamping hook hooks the hook platform; a first concave cambered surface is formed on the surface of the column base facing the bearing part; the bearing part on the face towards the column base form the second cambered surface of evagination, the jack is seted up on the second cambered surface, after grafting portion and bearing part joint cooperation, first cambered surface and second cambered surface counterbalance lean on and normal running fit.

5. The long travel lumbar support mechanism of claim 1, wherein: the support adjusting component can be any one of an electric push rod, an air rod or a hydraulic rod, two ends of the support adjusting component are respectively connected with the back support and the back support in a rotating mode, and the inclination angle of the support adjusting component relative to the horizontal plane changes along with the opening and closing movement of the back support.

6. The long travel lumbar support mechanism of claim 1, wherein: the support adjusting component comprises a first support seat and a second support seat, and the first support seat and the second support seat generate relative movement when the back support piece moves in an opening and closing manner; the clamping mechanism is arranged between the first supporting seat and the second supporting seat, when the back supporting piece is opened forwards, the clamping mechanism keeps the position of the first supporting seat and the second supporting seat after relative movement, the clamping mechanism comprises a rack, a clamping tongue and a spring, a plurality of clamping grooves are distributed on the rack along the length direction, and the clamping tongue rotates around a pivot and keeps the trend of clamping with the clamping grooves under the action of the spring.

7. The long travel lumbar support mechanism of claim 6, wherein: the clamping mechanism also comprises a tongue seat and a limiting piece, the clamping tongue is connected on the tongue seat, and the tongue seat is connected with the pivot; the rack comprises a clamping tooth section, a plurality of clamping teeth are distributed on the clamping tooth section along the length direction, and a clamping groove is formed between every two clamping teeth; along the length direction, the two ends of the rack at the clamping tooth section are respectively provided with a clamping tongue jacking and holding section and a rotary boss; along the thickness direction of the rack, the heights of the clamping tongue jacking and holding section and the rotary boss are both greater than the height of the clamping tooth section; the tongue base is also provided with a locking tongue matched with the limiting piece, when the clamping tongue is positioned at the clamping tooth section, the clamping tongue is in clamping fit with the clamping groove at the corresponding position, and the limiting piece does not limit the locking tongue; when the clamping tongue abuts against the clamping tongue jacking and maintaining section, the clamping tongue rotates towards the direction leaving the clamping groove, the limiting piece locks the locking tongue and enables the clamping tongue to maintain the unlocking state of being disengaged from the clamping groove, and when the first supporting seat and the second supporting seat move relatively, the limiting piece crosses over the clamping tooth section and touches the rotary boss, so that the clamping tongue rotates reversely to be clamped with the clamping groove, and the locking tongue is disengaged from the limiting piece.

8. The long travel lumbar support mechanism of claim 7, wherein: the height of the clamping tongue jacking and maintaining section along the thickness direction of the rack is lower than that of the rotary boss.

9. The long travel lumbar support mechanism of claim 7, wherein: the locking tongue and the limiting part are staggered all the time, and when the locking tongue rotates, the locking tongue crosses the limiting part through elastic deformation and is abutted with the limiting part to be locked or is separated from the limiting part to be unlocked.

10. The long travel lumbar support mechanism of claim 9, wherein: at least one of the limiting piece and the locking tongue is an elastic piece.

11. The long travel lumbar support mechanism of claim 7, wherein: the first support seat is a hollow sleeve, and the rack is fixedly arranged in the first support seat; the clamping tongue, the tongue seat, the spring and the limiting piece are arranged on the second supporting seat, and the first supporting seat is in sleeve fit with the second supporting seat; the second supporting seat is rotatably connected with the back support, and the first supporting seat is rotatably connected with the back support.

12. The long travel lumbar support mechanism of claim 7, wherein: the spring is a torsion spring, the tongue seat is rotatably connected with the second supporting seat through a pivot, the torsion spring is sleeved on the pivot, the first torsion arm of the torsion spring and the second supporting seat are relatively fixed, and the second torsion arm of the torsion spring acts on the tongue seat.

13. The long travel lumbar support mechanism of claim 7, wherein: the limiting piece is a plate-shaped body and is fixedly arranged on the second supporting body, and one end of the limiting piece is suspended to form a limiting part matched with the locking tongue.

14. The long travel lumbar support mechanism of claim 1, wherein: from back to front, support the adjusting part and be the slope of ramp up between back of the body support piece and back support piece, when back support piece lower extreme moved forward, support the whole contained angle with the horizontal plane of adjusting part and diminish.

15. The long travel lumbar support mechanism of claim 1, wherein: the back support piece comprises an upper back component and a lower back component which are of frame structures, one end of the supporting and adjusting component is connected to the lower portion of the back support, the other end of the supporting and adjusting component is connected to the upper back component, and an elastic connection mode is adopted between the upper back component and the lower back component.

16. The long travel lumbar support mechanism of claim 15, wherein: the upper back component and the lower back component are elastically connected: the upper back component and the lower back component are connected through a spring steel sheet.

17. The long travel lumbar support mechanism of claim 15, wherein: the upper back component and the lower back component are elastically connected: the upper back component is rotationally connected with the lower back component, and a return spring is arranged between the upper back component and the lower back component.

18. The long travel lumbar support mechanism of claim 1, wherein: the back support piece comprises an upper back component and a lower back component which are of frame structures, one end of the supporting and adjusting component is connected to the lower portion of the back support, the other end of the supporting and adjusting component is connected to the lower back component, and a rigid connection mode is adopted between the upper back component and the lower back component.

19. The long travel lumbar support mechanism of claim 18, wherein: the upper back component and the lower back component are rigidly connected: the upper back component and the lower back component are connected through a steel plate.

20. The long travel lumbar support mechanism of claim 1, wherein: the back support is a column support, a gap is always reserved between the lower end of the back support and the back support, the width of the back support is greater than that of the back support, and the support adjusting assembly is arranged at the middle position in the width direction of the back support.

21. The long travel lumbar support mechanism of claim 1, wherein: the distance between the joint of the back support and the back support is 50-60cm from the lower end of the back support.

22. A seat, characterized by: comprising a seat and a long-stroke lumbar support mechanism as claimed in any of claims 1-20, the lower end of the back support being directly or indirectly connected to the seat.