CN113647768B - Environment-friendly waist rest rubber spring - Google Patents
Environment-friendly waist rest rubber spring Download PDFInfo
- Publication number
- CN113647768B CN113647768B CN202110996710.4A CN202110996710A CN113647768B CN 113647768 B CN113647768 B CN 113647768B CN 202110996710 A CN202110996710 A CN 202110996710A CN 113647768 B CN113647768 B CN 113647768B
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- spring
- movable groove
- groove
- seat
- guide
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 2
- 230000008093 supporting effect Effects 0.000 description 19
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 206010050031 Muscle strain Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 208000029761 vertebral disease Diseases 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Support for the head or the back
- A47C7/40—Support for the head or the back for the back
- A47C7/42—Support for the head or the back for the back of detachable or loose type
- A47C7/425—Supplementary back-rests to be positioned on a back-rest or the like
Landscapes
- Chairs Characterized By Structure (AREA)
Abstract
The invention discloses an environment-friendly lumbar rubber spring, which belongs to the technical field of office and medical rehabilitation lumbar, and particularly relates to an environment-friendly lumbar rubber spring, which comprises a sleeve body, a column body, an upper fixed seat, a lower fixed seat and a mounting seat, wherein limiting grooves are transversely formed in the upper fixed seat and the lower fixed seat, elastic limiting mechanisms are arranged in the sleeve body and the column body, limiting ends of the elastic limiting mechanisms are clamped in the limiting grooves, a movable groove I capable of accommodating the movement of the column body is longitudinally formed in the sleeve body, a guide seat is arranged on the inner wall of the movable groove I, and a sliding seat is connected to the guide seat in a sliding manner.
Description
Technical Field
The invention relates to the technical field of office and medical rehabilitation lumbar support, in particular to an environment-friendly lumbar support rubber spring.
Background
At present, the working pressure of people in society is continuously improved, a plurality of people need to sit in offices for working for a long time, and the long-time working is easy to cause waist fatigue, waist blood is not circulated, and the feeling of waist soreness and distension and the like appears; if the lumbar vertebra is not treated and protected, the lumbar vertebra is gradually pressed, lumbar muscle strain and lumbar vertebra diseases are caused, in order to reduce fatigue of the lumbar vertebra, a plurality of types of lumbar rests appear on the market, the lumbar rests can maintain normal physiological curvature of the lumbar vertebra, the lumbar rests are prevented from being suspended, the supporting effect is achieved, the conditions of strain, fatigue and overstress of the lumbar are avoided, at present, the inner core of the lumbar rest on the market is usually made of materials such as down, sponge, cloud PP cotton, latex, memory sponge and the like, and the lumbar rest is soft but has small supporting force on the lumbar.
Most of the prior lumbar support internal structures use springs, most of the common springs lose part of elasticity due to shaping deformation after being used for a period of time due to the self service life, the prior lumbar support internal structure cannot play an original supporting effect, fatigue of the waist cannot be relieved, the waist is protected, the springs or the lumbar support are required to be replaced, and the use cost is increased.
Disclosure of Invention
The invention aims to provide an environment-friendly waist support rubber spring, which solves the problems that after a period of use, the rubber spring loses part of elasticity due to shaping deformation, the original supporting effect is not achieved, and the use cost is increased.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides an environmental protection waist leans on rubber spring, includes the cover body, cylinder, upper and lower two fixing bases and mount pad, about all transversely seted up the spacing groove in the fixing base, and all be equipped with elasticity stop gear in the cover body and the cylinder, elasticity stop gear's spacing end card is established in the spacing groove, the internal longitudinal direction of cover has seted up the movable groove one that can hold the cylinder activity, and is equipped with the guide holder on the movable groove one inner wall, the sliding connection has the slide on the guide holder, the cylinder is passed movable groove one with the one end that the fixing base deviates from mutually and is connected with the slide, be equipped with spring one in the movable groove one, and the both ends of spring one are connected with movable groove one inner wall, slide respectively, and are equipped with the magnetic block in the movable groove one, the movable groove two has been seted up in the cylinder, be equipped with the slider in the movable groove two, and be equipped with the electro-magnet that can change positive and negative polarity on the slider, the other end and the spring two's one end are connected.
Preferably, the first spring is sleeved outside the magnetic block, the first spring is a composite rubber spring, and the second spring is a rubber spring.
Preferably, the guide seat is provided with a guide groove, the inner wall of the guide groove is provided with a ball, the slide seat is provided with a convex block matched with the guide groove, the convex block is slidingly connected in the guide groove and is attached to the ball, and the slide seat is integrally formed.
Preferably, the sleeve body and the cylinder are internally provided with a movable groove III, the elastic limiting mechanism is positioned in the movable groove III, the elastic limiting mechanism comprises a spring III and left and right limiting seats, two ends of the spring III are respectively connected with the left and right limiting seats, and one end, deviating from the spring three phases, of the limiting seats penetrates through the movable groove III and is clamped in the limiting groove.
Preferably, the pressing device is arranged in the limiting groove, the pressing device comprises an upper guide rod, a lower guide rod, a spring IV, a limiting block and a pressing head, the guide rod is transversely erected in the limiting groove, the outer wall of the guide rod is sleeved with the spring IV and the limiting block, two ends of the spring IV are respectively connected with the limiting block and the inner wall of the limiting groove, one end of the pressing head is connected with the limiting block, the other end of the pressing head penetrates through the limiting groove to extend outwards, and one end, deviating from the limiting block with the pressing head, of the pressing head is attached to the limiting seat.
Preferably, a movable groove IV capable of accommodating the movement of the electromagnet is formed in the sliding seat, and a rubber sealing ring is arranged at the joint of the inner wall of the movable groove IV and the outer wall of the column body.
Compared with the prior art, the invention has the beneficial effects that:
1) Compared with the springs in the prior art, the magnetic block and the electromagnet are arranged in the spring, when the sleeve body or the cylinder is stressed, the first spring in the spring deforms and contracts, at the moment, the distance between the magnetic block and the electromagnet is reduced, when the magnetic poles of the electromagnet are opposite to those of the magnetic block, the two magnets repel each other to generate supporting force, and meanwhile, the second spring deforms and contracts when the two magnets repel each other, so that the supporting effect is better, the supporting effect is harder, the waist can be better supported, the waist fatigue is relieved, the waist is protected, when the current direction of the electromagnet is changed, the magnetic poles of the electromagnet change, and the magnetic blocks attract each other, so that the sliding seat is easier to approach the magnetic block, the first spring contracts, the supporting is independently carried out by virtue of the elasticity of the second spring, the supporting effect is softer, the used feeling is softer, the second spring can be flexibly adjusted according to the use requirements of different users, and the spring has good market competitiveness.
2) According to the invention, the magnetic block and the electromagnet can generate rebound more rapidly, so that certain power assistance can be provided when the spring I rebounds and expands, deformation and elasticity loss caused by long-time use of the spring I are avoided, and the service life of the spring I is prolonged.
3) After the spring is used for a long time, when the first spring and the second spring reach the upper limit of the service life, the elasticity is lost, the two magnetic blocks in the spring still can generate repulsive force, the function of supporting is achieved, and the spring can still be used normally.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the elastic limiting mechanism of the present invention;
FIG. 3 is an enlarged schematic view of the invention at A in FIG. 2;
FIG. 4 is a schematic view of the internal structure of the sleeve and column of the present invention;
fig. 5 is a schematic structural view of a guide seat according to the present invention.
In the figure: the device comprises a sleeve body 1, a cylinder 2, a fixed seat 3, an installation seat 4, a pressing head 5, a movable groove 6, a spring 7, a limiting seat 8, a limiting block 9, a spring 10, a guide seat 11, a guide groove 12, a ball 13, a sliding seat 14, a spring 15, a magnetic block 16, an electromagnet 17, a movable groove 18, a sliding block 19, a spring 20, a limiting groove 21 and an elastic limiting mechanism 22.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Examples:
referring to fig. 1-5, the present invention provides a technical solution: the environment-friendly lumbar rubber spring comprises a sleeve body 1, a column body 2, an upper fixing seat 3, a lower fixing seat 3 and a mounting seat 4, wherein limiting grooves 21 are transversely formed in the upper fixing seat 3 and the lower fixing seat 3, elastic limiting mechanisms 22 are arranged in the sleeve body 1 and the column body 2, limiting ends of the elastic limiting mechanisms 22 are clamped in the limiting grooves 21, the fixing seat 3 can be fixed through the elastic limiting mechanisms 22, a movable groove I capable of accommodating the movement of the column body 2 is longitudinally formed in the sleeve body 1, a guide seat 11 is arranged on the inner wall of the movable groove I, a sliding seat 14 is connected onto the guide seat 11 in a sliding manner, the sliding seat 14 slides up and down on the guide seat 11, the guide seat 11 can play a role in guiding and preventing offset load on the sliding seat 14, one end, deviating from the column body 2 and the fixing seat 3, passes through the movable groove I and is connected with the sliding seat 14, a spring I15 is arranged in the movable groove I, the two ends of the first spring 15 are respectively connected with the inner wall of the first movable groove and the sliding seat 14, the first movable groove is internally provided with the magnetic block 16, the cylinder 2 is internally provided with the second movable groove 18, the second movable groove 18 is internally provided with the sliding block 19, the sliding block 19 is provided with the electromagnet 17 capable of changing positive and negative polarities, the other end of the sliding block 19 is connected with one end of the second spring 20, the other end of the second spring 20 is connected with the inner wall of the second movable groove 18, when the sleeve body 1 or the cylinder 2 is stressed, the first spring 15 in the sleeve body deforms and contracts, at the moment, the distance between the magnetic block 16 and the electromagnet 17 is reduced, when the magnetic poles of the electromagnet 17 are opposite to the magnetic poles of the magnetic block 16, the two mutually repel each other to generate supporting force, and at the same time, the second spring 20 deforms and contracts when repulsive, the supporting effect is better, the supporting effect is harder, the waist can be supported better, the waist fatigue is relieved and the waist is protected, when the current direction of the electromagnet 17 changes, the magnetic poles of the electromagnet change and attract each other between the electromagnet and the magnetic block 16, so that the sliding seat 14 is easier to approach the magnetic block 16, the first spring 15 contracts, the supporting effect is softer, the used feeling is softer, the electromagnet can be flexibly adjusted according to the use requirements of different users, good market competitiveness is achieved, the electromagnet 17 can be mutually repelled by the magnetic block 16 to generate rebound more quickly, certain assistance can be provided for the first spring 15 when the first spring 15 is rebound and unfolded, deformation and elasticity loss caused by long-time use of the first spring 15 are avoided, the service life of the first spring 15 is prolonged, the elasticity is lost when the first spring 15 and the second spring 20 reach the upper limit of the service life after long-time use, the repulsive force can still be generated by the magnetic block 16 and the electromagnet 17 in the inside, the supporting effect is still achieved, and the spring can still be normally used.
The first spring 15 is sleeved outside the magnetic block 16, the first spring 15 is a composite rubber spring, and the second spring 20 is a rubber spring.
The guide seat 11 is provided with a guide groove 12, the inner wall of the guide groove 12 is provided with a ball 13, the slide seat 14 is provided with a convex block matched with the guide groove 12, the convex block is slidingly connected in the guide groove 12 and is attached to the ball 13, sliding is smoother, and the slide seat 14 is integrally formed.
The sleeve body 1 and the cylinder body 2 are internally provided with a movable groove III 6, the elastic limiting mechanism 22 is positioned in the movable groove III 6, the elastic limiting mechanism 22 comprises a spring III 7 and a left limiting seat 8 and a right limiting seat 8, two ends of the spring III 7 are respectively connected with the left limiting seat 8 and the right limiting seat 8, and one end, deviating from the spring III 7, of the limiting seat 8 penetrates through the movable groove III 6 to be clamped in the limiting groove 21.
Be equipped with press device in the spacing groove 21, and press device includes two upper and lower guide bars, spring four 10, stopper 9 and presses head 5 about the guide bar transversely erects in spacing groove 21, and the guide bar outer wall cover is equipped with spring four 10 and stopper 9, the both ends of spring four 10 are connected with stopper 9, spacing groove 21 inner wall respectively, the one end of pressing head 5 is connected with stopper 9, and the other end of pressing head 5 passes spacing groove 21 and outwards extends, stopper 9 and the one end that deviates from mutually of pressing head 5 laminate with spacing seat 8, presses pressing head 5 and extrudees spacing seat 8 for spacing seat 8 shifts out from spacing groove 21, can take off fixing base 3 from cover body 1, cylinder 2, changes.
The sliding seat 14 is internally provided with a movable groove IV which can accommodate the movement of the electromagnet 17, and the joint of the inner wall of the movable groove I and the outer wall of the cylinder 2 is provided with a rubber sealing ring, so that the sealing effect is achieved.
Working principle: when the sleeve body 1 or the column body 2 is stressed, the first spring 15 in the sleeve body is deformed and contracted, at the moment, the distance between the first magnetic block 16 and the electromagnet 17 is reduced, when the magnetic poles of the electromagnet 17 are opposite to those of the first magnetic block 16, the first magnetic block 16 and the electromagnet are mutually repulsed to generate supporting force, and simultaneously the second magnetic block 20 can be deformed and contracted when the second magnetic block is repulsed, so that the supporting effect is better, the supporting effect is harder, the waist can be better supported, the waist fatigue is slowed down, the waist is protected, when the current direction of the electromagnet 17 is changed, the magnetic poles of the electromagnet are changed, the first magnetic block 16 and the second magnetic block 16 are mutually attracted, so that the sliding seat 14 is easier to approach the magnetic block 16, the first spring 15 is contracted, at the moment, the supporting effect is softer and the using feeling is softer, can adjust it in a flexible way according to different user's user demand, can produce the resilience more rapidly through magnetic block 16 and electro-magnet 17, thereby when spring one 15 resilience is expanded, can provide certain helping hand for spring one 15, avoid spring one 15 long-time use to produce deformation and lose elasticity, prolonged the life of spring one 15, after long-time use, when its spring one 15 reaches life upper limit with spring two 20, lose elasticity, its inside magnetic block 16 still can produce repulsion with electro-magnet 17, play the effect of support, guaranteed that the spring still can normally use, press pressing head 5 extrudees spacing seat 8, make spacing seat 8 shift out from spacing groove 21, can take off fixing base 3 from cover body 1, cylinder 2, change.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an environmental protection waist leans on rubber spring, includes cover body (1), cylinder (2), upper and lower two fixing base (3) and mount pad (4), its characterized in that: the upper and lower all transversely seted up spacing groove (21) in fixing base (3), and all be equipped with elasticity stop gear (22) in cover body (1) and cylinder (2), the spacing end card of elasticity stop gear (22) is established in spacing groove (21), the movable groove one that can hold cylinder (2) activity has been vertically seted up in cover body (1), and is equipped with guide holder (11) on the inner wall of movable groove one, sliding connection has slide (14) on guide holder (11), the one end that cylinder (2) and fixing base (3) deviate from is passed movable groove one and is connected with slide (14), be equipped with spring one (15) in the movable groove one, and the both ends of spring one (15) are connected with movable groove one inner wall, slide (14) respectively, and are equipped with magnetic block (16) in the movable groove one, set up movable groove two (18) in the cylinder (2), be equipped with slider (19) in the movable groove two (18), and be equipped with on slider (19) and can change positive negative polarity's electro-magnet (17), the other end that cylinder (2) deviates from is connected with two spring one end (20) with two inner wall (20).
2. The environmentally friendly lumbar rubber spring according to claim 1, wherein: the first spring (15) is sleeved outside the magnetic block (16), the first spring (15) is a composite rubber spring, and the second spring (20) is a rubber spring.
3. The environmentally friendly lumbar rubber spring according to claim 1, wherein: the guide seat (11) is provided with a guide groove (12), the inner wall of the guide groove (12) is provided with a ball (13), the slide seat (14) is provided with a convex block matched with the guide groove (12), the convex block is slidingly connected in the guide groove (12) and is attached to the ball (13), and the slide seat (14) is integrally formed.
4. The environmentally friendly lumbar rubber spring according to claim 1, wherein: the sleeve body (1) and the cylinder (2) are internally provided with a movable groove III (6), an elastic limiting mechanism (22) is arranged in the movable groove III (6), the elastic limiting mechanism (22) comprises a spring III (7) and a left limiting seat and a right limiting seat (8), two ends of the spring III (7) are respectively connected with the left limiting seat and the right limiting seat (8), and one end, deviating from the spring III (7), of the limiting seat (8) penetrates through the movable groove III (6) to be clamped in the limiting groove (21).
5. The environmentally friendly lumbar rubber spring according to claim 4, wherein: be equipped with press device in spacing groove (21), and press device includes two upper and lower guide bars, four (10) of spring, stopper (9) and presses first (5), upper and lower the guide bar transversely erects in spacing groove (21), and guide bar outer wall cover is equipped with four (10) of spring and stopper (9), the both ends of four (10) of spring are connected with stopper (9), spacing groove (21) inner wall respectively, the one end of pressing first (5) is connected with stopper (9), and presses the other end of first (5) to pass spacing groove (21) outside extension, stopper (9) are laminated with spacing seat (8) with the one end that presses first (5) to deviate from mutually.
6. The environmentally friendly lumbar rubber spring according to claim 1, wherein: a movable groove IV capable of accommodating the movement of the electromagnet (17) is formed in the sliding seat (14), and a rubber sealing ring is arranged at the joint of the inner wall of the movable groove IV and the outer wall of the column body (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110996710.4A CN113647768B (en) | 2021-08-27 | 2021-08-27 | Environment-friendly waist rest rubber spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110996710.4A CN113647768B (en) | 2021-08-27 | 2021-08-27 | Environment-friendly waist rest rubber spring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113647768A CN113647768A (en) | 2021-11-16 |
| CN113647768B true CN113647768B (en) | 2023-12-22 |
Family
ID=78493121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110996710.4A Active CN113647768B (en) | 2021-08-27 | 2021-08-27 | Environment-friendly waist rest rubber spring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113647768B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114766860B (en) * | 2022-05-06 | 2024-05-07 | 嘉兴慕思智能家居有限公司 | Structure with adjustable softness and hardness, adjusting method thereof and mattress |
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| US5332202A (en) * | 1991-02-06 | 1994-07-26 | The Ohio Mattress Company Licensing And Components Group | Pneumatic member and related attachment elements for cushions, seats, foundations and the like |
| KR0151752B1 (en) * | 1994-05-20 | 1998-10-15 | 김학균 | Spring mattress assembly having magnetic parts |
| KR20030087599A (en) * | 2003-10-13 | 2003-11-14 | 정찬인 | the multi function bed with A KNEADER |
| KR20150098091A (en) * | 2014-02-19 | 2015-08-27 | 고두일 | Shock absorber apparatus for vehicle using magnetic force |
| CN205597591U (en) * | 2016-03-23 | 2016-09-28 | 陈康海 | Spring waist leans on |
| CN208634269U (en) * | 2018-08-13 | 2019-03-22 | 济源金五联金属制品有限公司 | A kind of high strength overlong spring |
| CN209738885U (en) * | 2018-12-05 | 2019-12-06 | 宁波福莱汽车零部件有限公司 | Automobile seat back cushion |
| CN112477715A (en) * | 2020-11-30 | 2021-03-12 | 广州鹏瑞畅网络科技有限公司 | Intelligent automobile cushion capable of automatically recovering elasticity |
| CN212709087U (en) * | 2020-05-25 | 2021-03-16 | 江苏格瑞林家居科技有限公司 | Automobile waist cushion |
| CN212815350U (en) * | 2020-05-20 | 2021-03-30 | 恒林家居股份有限公司 | Chair and waist rest structure thereof |
-
2021
- 2021-08-27 CN CN202110996710.4A patent/CN113647768B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5332202A (en) * | 1991-02-06 | 1994-07-26 | The Ohio Mattress Company Licensing And Components Group | Pneumatic member and related attachment elements for cushions, seats, foundations and the like |
| KR0151752B1 (en) * | 1994-05-20 | 1998-10-15 | 김학균 | Spring mattress assembly having magnetic parts |
| KR20030087599A (en) * | 2003-10-13 | 2003-11-14 | 정찬인 | the multi function bed with A KNEADER |
| KR20150098091A (en) * | 2014-02-19 | 2015-08-27 | 고두일 | Shock absorber apparatus for vehicle using magnetic force |
| CN205597591U (en) * | 2016-03-23 | 2016-09-28 | 陈康海 | Spring waist leans on |
| CN208634269U (en) * | 2018-08-13 | 2019-03-22 | 济源金五联金属制品有限公司 | A kind of high strength overlong spring |
| CN209738885U (en) * | 2018-12-05 | 2019-12-06 | 宁波福莱汽车零部件有限公司 | Automobile seat back cushion |
| CN212815350U (en) * | 2020-05-20 | 2021-03-30 | 恒林家居股份有限公司 | Chair and waist rest structure thereof |
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| CN113647768A (en) | 2021-11-16 |
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