阅读说明：本技术 一种自适应靠背座椅 (Self-adaptive backrest seat ) 是由 胡喆 于 2020-06-09 设计创作，主要内容包括：本发明公开了一种自适应靠背座椅,涉及座椅技术领域,其包括底座；椅面,设在底座的上表面；两组平行的导轨,设在底座上表面的两侧边缘处,所述导轨的一端为平直段,另一端为弧形段；靠背,设在底座上,垂直于底座的上表面,所述靠背靠近底座一侧边的两端分别设有滑动机构,所述滑动机构均滑动设置在导轨上；以及弹性支撑装置,设在底座上,且与靠背相连,用于对靠背进行支撑,并提供靠背复位所需的回弹力。本发明能够有效提高人在倚靠靠背过程中的舒适度。(The invention discloses a self-adaptive backrest seat, which relates to the technical field of seats and comprises a base; the chair surface is arranged on the upper surface of the base; the two groups of parallel guide rails are arranged at the edges of two sides of the upper surface of the base, one end of each guide rail is a straight section, and the other end of each guide rail is an arc-shaped section; the backrest is arranged on the base and is vertical to the upper surface of the base, two ends of the backrest, which are close to one side edge of the base, are respectively provided with a sliding mechanism, and the sliding mechanisms are arranged on the guide rails in a sliding manner; and the elastic supporting device is arranged on the base, is connected with the backrest and is used for supporting the backrest and providing resilience force required by backrest resetting. The invention can effectively improve the comfort of people in the process of leaning against the backrest.)

1. An adaptive back seat, comprising: comprises that

A base (1);

a chair surface (11) arranged on the upper surface of the base (1);

the two groups of parallel guide rails (2) are arranged at the edges of two sides of the upper surface of the base (1), one end of each guide rail (2) is a straight section, and the other end of each guide rail (2) is an arc section;

the backrest (12) is arranged on the base (1) and is vertical to the upper surface of the base (1), two ends of the backrest (12), which are close to one side of the base (1), are respectively provided with a sliding mechanism (3), and the sliding mechanisms (3) are arranged on the guide rail (2) in a sliding manner; and

the elastic supporting device (4) is arranged on the base (1), is connected with the backrest (12) and is used for supporting the backrest (12) and providing resilience force required by the resetting of the backrest (12).

2. An adaptive back seat according to claim 1, wherein: the two side surfaces of the guide rail (2) are respectively provided with a first guide groove (21) along the length direction, and the top surface of the guide rail (2) is provided with a second guide groove (22) along the length direction;

the two ends of the lower side of the backrest (12) are respectively fixed with a mounting body (13), and the sliding mechanism (3) comprises a first sliding assembly (31) and a second sliding assembly (32), wherein the first sliding assembly (31) and the second sliding assembly are respectively arranged on the surfaces of the two sides of the mounting body (13) and the second sliding assembly (32) is arranged on the lower end face of the mounting body (13);

the first sliding assembly (31) comprises two connecting rods (311) hinged on the mounting body (13) and first rollers (312) respectively rotatably connected to free ends of the two connecting rods (311), and the first rollers (312) are slidably arranged in the first guide grooves (21);

the second sliding assembly (32) comprises a vertical plate (321) fixed to the middle portion of the lower end face of the installation body (13) and second rollers (322) respectively connected to the surfaces of two sides of the vertical plate (321) in a rotating mode, two of the second rollers (322) are arranged on each side surface of the vertical plate (321), and the second rollers (322) are arranged in the second guide grooves (22) in a sliding mode.

3. An adaptive back seat according to claim 2, wherein: in each set of first sliding assemblies (31), a first spring (313) is arranged between the two connecting rods (311);

the two opposite side surfaces of the two connecting rods (311) are respectively provided with an accommodating groove (314), two ends of the first spring (313) are respectively abutted against the bottom surface of the accommodating groove (314), and the first spring (313) is always in a compressed state.

4. An adaptive back seat according to claim 2, wherein: the lower part of the base (1) is fixedly provided with a supporting plate (14), a cross rod (15) is fixed between the two mounting bodies (13), and the elastic supporting device (4) comprises

A cylinder body (41) one end of which is hinged on the support plate (14);

a pressure plate (42) slidably provided in the cylinder (41);

one end of the rod body (43) is fixedly connected to the pressure plate (42), and the other end of the rod body penetrates out of the cylinder body (41) and is hinged to the cross rod (15); and

and a second spring (44) which is arranged in the cylinder body (41), wherein one end of the second spring (44) is abutted against the bottom of the cylinder body (41), the other end of the second spring is abutted against the pressure plate (42), and the second spring (44) is always in a compressed state.

5. An adaptive back seat according to claim 4, wherein: and a plurality of groups of elastic supporting devices (4) are uniformly distributed along the direction vertical to the guide rail (2).

6. An adaptive back seat according to claim 4, wherein: base (1) upper surface fixed has stand (16), the top at stand (16) is fixed in seat (11), pass between terminal surface and horizontal pole (15) under the one end of seat (11) from back (12), the one end of seat (11) is straight portion, and the other end is the arc portion unanimous with guide rail (2) arc section radian.

7. An adaptive back seat according to claim 4 or 5, wherein: the air storage bag (5) is further arranged on the supporting plate (14), a guide pipe (45) is connected to the bottom of the cylinder body (41), and one end, far away from the cylinder body (41), of the guide pipe (45) is connected with the air storage bag (5).

8. An adaptive back seat according to claim 7, wherein: an overflow valve (51) is also arranged on the air storage bag (5).

9. An adaptive back seat according to claim 1, wherein: the end part of the chair surface (11) far away from the backrest (12) is provided with an arc-shaped plate (17).

Technical Field

The invention relates to the technical field of seats, in particular to a self-adaptive backrest seat.

Background

As the chair is essential furniture for homes and offices, the design of the backrest of the chair is often very important in order to adapt to different leaning states of a person.

The patent publication No. CN204169384U discloses an angle-adjustable elastic backrest seat, which comprises supporting legs, a seat surface and a backrest, wherein the seat surface and the backrest are hinged with each other, pressing plates are fixed on two sides of the backrest, strip-shaped holes are formed in the lower half parts of the pressing plates, an adjuster is arranged between the pressing plates and two rear side supporting legs and comprises a pressing spring and a screw rod, the front section of the screw rod is smooth, the rear section of the screw rod is provided with threads, a step is arranged between a smooth rod and a threaded rod, the smooth rod abuts against the supporting legs from circular holes of the supporting legs, and a handle is fixed at the end of the smooth rod. The threaded rod penetrates out of the strip-shaped hole of the pressing plate, the threaded rod is sleeved with a nut and a pressure spring, and two ends of the pressure spring are fixedly connected with the nut and the pressing plate respectively.

In the mode, the backrest is hinged to the seat, the elastic effect is brought to the backrest through the resilience force of the pressure spring, and a person can rock the backrest forwards and backwards to adapt to different sitting postures. However, when the back of a person rotates at an excessively large angle, the back of the user tends to slide relative to the backrest or the hip of the user tends to slide relative to the seat, and the backrest cannot move, so that a large friction force is generated between the back of the user and the backrest or between the hip of the user and the seat, and clothes easily slip off relative to the body surface, so that discomfort is caused to the human body.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a self-adaptive backrest seat which can solve the problem that clothes slip off from a human body when the back movement angle of the human body is too large.

The above object of the present invention is achieved by the following technical solutions:

an adaptive back seat comprising

A base;

the chair surface is arranged on the upper surface of the base;

the two groups of parallel guide rails are arranged at the edges of two sides of the upper surface of the base, one end of each guide rail is a straight section, and the other end of each guide rail is an arc-shaped section;

the backrest is arranged on the base and is vertical to the upper surface of the base, two ends of the backrest, which are close to one side edge of the base, are respectively provided with a sliding mechanism, and the sliding mechanisms are arranged on the guide rails in a sliding manner; and

and the elastic supporting device is arranged on the base, is connected with the backrest and is used for supporting the backrest and providing resilience force required by backrest resetting.

By adopting the technical scheme, when a person is in a working state, the backrest is positioned at the straight section of the guide rail under the action of the elastic supporting device; when a user needs to rest, the user leans backwards against the backrest, the sliding mechanism moves along the guide rail, and the backrest can horizontally move relative to the chair surface and rotate relative to the horizontal plane along with the sliding mechanism in the process of moving along the arc-shaped section of the guide rail; meanwhile, the backrest moves relative to the seat, the space between the seat and the backrest is increased, the backrest can be attached to a human body, and the comfort level is improved.

The present invention in a preferred example may be further configured to: the two side surfaces of the guide rail are respectively provided with a first guide groove along the length direction of the guide rail, and the top surface of the guide rail is provided with a second guide groove along the length direction of the guide rail;

the two ends of the lower side edge of the backrest are respectively fixed with a mounting body, and the sliding mechanism comprises a first sliding assembly and a second sliding assembly, wherein the first sliding assembly is respectively arranged on the surfaces of the two sides of the mounting body, and the second sliding assembly is arranged on the lower end surface of the mounting body;

the first sliding assembly comprises two connecting rods hinged on the mounting body and first rollers respectively rotatably connected to free ends of the two connecting rods, and the first rollers are slidably arranged in the first guide grooves;

the second slip subassembly is including fixing the riser of terminal surface mid portion under the installation body and rotating the second gyro wheel of connection on the riser both sides surface respectively, the second gyro wheel all is provided with two on each side surface of riser, the second gyro wheel slides and sets up in the second guide way.

By adopting the technical scheme, the first roller and the second roller are respectively arranged in the first guide groove and the second guide groove, when the sliding mechanism moves along the guide rail, the peripheral surface of the first roller is abutted against the top surface of the first guide groove, the peripheral surface of the second roller is abutted against the bottom surface of the second guide groove, and the sliding mechanism is effectively positioned; because the two first rollers are rotatably arranged on the connecting rods, and the two connecting rods are hinged on the mounting body, in the process of transition from the straight section to the arc section of the guide rail, the angle between the two connecting rods can be opened and closed in a micro range according to the movement track, and the sliding of the sliding mechanism is smoother; meanwhile, the backrest cannot rotate relative to the guide rail due to the support of the two first rollers.

The present invention in a preferred example may be further configured to: in each group of first sliding assemblies, a first spring is arranged between the two connecting rods;

the two opposite side surfaces of the two connecting rods are respectively provided with a containing groove, two ends of the first spring are respectively abutted against the bottom surfaces of the containing grooves, and the first spring is always in a compressed state.

Through adopting above-mentioned technical scheme, first spring can give the pressure of supporting of two connecting rods to both sides, and when first slip subassembly slided along the guide rail, the outer peripheral face of two first gyro wheels was supported tightly all the time on the top surface of first guide way, avoided rocking of first gyro wheel, first gyro wheel and second gyro wheel press from both sides tightly on the guide rail, guaranteed the stationarity of motion.

The present invention in a preferred example may be further configured to: the lower part of the base is fixedly provided with a supporting plate, a cross rod is fixed between the two installation bodies, and the elastic supporting device comprises

One end of the cylinder body is hinged on the supporting plate;

the pressing plate is arranged in the cylinder body in a sliding mode;

one end of the rod body is fixedly connected to the pressure plate, and the other end of the rod body penetrates out of the cylinder body and is hinged to the cross rod; and

the second spring is arranged in the cylinder body, one end of the second spring is abutted to the bottom of the cylinder body, the other end of the second spring is abutted to the pressing plate, and the second spring is always in a compressed state.

Through adopting above-mentioned technical scheme, the people is when relying on the back backward, and the back moves along the guide rail, and the body of rod withdrawal cylinder body is internal and compress the second spring, and the concrete position of back depends on the state of people's back, and when the back stayed a certain position, the pressure of people's back to the back and the elasticity of second spring were in relative equilibrium state. When people want to get up, because the elastic potential energy that the second spring stored, the second spring can produce a thrust to human back, and under the second spring thrust effect, it is easier to get up.

The present invention in a preferred example may be further configured to: and a plurality of groups of elastic supporting devices are uniformly distributed along the direction vertical to the guide rail.

Through adopting above-mentioned technical scheme, can effectively improve the support and the resilience effect to the back, improve the stability of whole structure.

The present invention in a preferred example may be further configured to: the utility model discloses a chair, including base, seat, back, horizontal pole, straight portion, the base upper surface is fixed with the stand, the top at the stand is fixed to the seat, the one end of seat passes between terminal surface and the horizontal pole under the back, the one end of seat is straight portion, and the other end is the arc portion unanimous with guide rail arc section radian.

Through adopting above-mentioned technical scheme, the seat is higher than the upper surface of base, can cover and close in horizontal pole and elastic support device's top, effectively protects horizontal pole and elastic support device, improves whole seat structure's pleasing to the eye degree simultaneously.

The present invention in a preferred example may be further configured to: the support plate is further provided with an air storage bag, the bottom of the cylinder body is connected with a guide pipe, and one end, far away from the cylinder body, of the guide pipe is connected with the air storage bag.

Through adopting above-mentioned technical scheme, the inside intercommunication through pipe and cylinder body of gas storage bag can be at the inside gas of impressing of gas storage bag, and when the back removed the compression second spring along the guide rail, with the gas of cylinder body in the gas storage bag of impressing, gas pressure was stored to the gas storage bag, and when getting up, this gas pressure can produce thrust to the clamp plate. The cooperation of gas storage bag and second spring can further improve elastic support device's supplementary resilience effect, improves whole support and resilience effect, also avoids long-term use simultaneously in, second spring fatigue failure.

The present invention in a preferred example may be further configured to: an overflow valve is also arranged on the air storage bag.

Through adopting above-mentioned technical scheme, the overflow valve can control the pressure of compressed air in the gas storage bag, releases the gas in the gas storage bag when atmospheric pressure reaches the setting value, prevents that the too high accident that causes of atmospheric pressure in the gas storage bag, improves the security.

The present invention in a preferred example may be further configured to: the end part of the chair surface far away from the backrest is provided with an arc-shaped plate.

Through adopting above-mentioned technical scheme, when the staff sat on the seat, the shank can be taken and put on the arc, and the setting of arc is human more in the laminating, has improved the comfort level of whole seat.

In summary, the invention includes at least one of the following beneficial technical effects:

1. when a person is in a working state, the backrest is positioned at the straight section of the guide rail under the action of the elastic supporting device; when a user needs to rest, the user leans backwards against the backrest, the sliding mechanism moves along the guide rail, and the backrest can horizontally move relative to the chair surface and rotate relative to the horizontal plane along with the sliding mechanism in the process of moving along the arc-shaped section of the guide rail; meanwhile, the backrest moves relative to the seat, the space between the seat and the backrest is increased, the backrest can be attached to a human body, and the comfort level is improved.

2. Through the cooperation of first slip subassembly, second slip subassembly and first guide way and second guide way, the removal of back along the guide rail is more smooth and easy and stable.

3. The energy required by the movement of the backrest is stored through the elastic supporting device, and the strength required by the person to get up from the rest state to the working state can be effectively reduced.

4. Through the setting of gas storage bag, the support and the resilience effect of elastic support device have further been reinforceed.

Drawings

Fig. 1 is a schematic overall structure diagram according to an embodiment of the present invention.

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a schematic structural view of the sliding mechanism in fig. 1.

Fig. 4 is a schematic view of the structure of fig. 1 from another view angle.

Fig. 5 is a cross-sectional view of fig. 4.

In the figure, 1, a base; 11. a chair surface; 12. a backrest; 13. an installation body; 14. a support plate; 15. a cross bar; 16. a column; 17. an arc-shaped plate; 2. a guide rail; 21. a first guide groove; 22. a second guide groove; 3. a sliding mechanism; 31. a first slide assembly; 311. a connecting rod; 312. a first roller; 313. a first spring; 314. a containing groove; 32. a second slide assembly; 321. a vertical plate; 322. a second roller; 4. an elastic support device; 41. a cylinder body; 42. pressing a plate; 43. a rod body; 44. a second spring; 45. a conduit; 5. a gas storage bag; 51. an overflow valve.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 4, an adaptive backrest seat disclosed in an embodiment of the present invention includes a base 1, a seat 11, a backrest 12, a guide rail 2, a sliding mechanism 3, and an elastic support device 4.

The chair surface 11 is arranged on the upper surface of the base 1 and is used for supporting a human body; the two groups of guide rails 2 are parallel to each other and are respectively positioned at the edges of two sides of the upper surface of the base 1, specifically, one end of each guide rail 2 is a straight section, and the other end of each guide rail 2 is an arc section which is smoothly connected with the straight section; the backrest 12 is arranged on the base 1, and the backrest 12 is vertical to the upper surface of the base 1; the sliding mechanisms 3 are arranged at two ends of the lower side edge of the backrest 12 and can slide along the guide rails 2; elastic supporting device 4 is established on base 1, and one end is connected with back 12, and when back 12 slided along guide rail 2, elastic supporting device 4 can support back 12 and human body, provides the required resilience force of back 12 reseing simultaneously.

First, a state in which the back of the person is straight is referred to as a working state, and a state in which the back of the person leans backward lying on the backrest 12 is referred to as a resting state.

When a person is in a working state, the backrest 12 is positioned on the straight section of the guide rail 2 under the action of the elastic supporting device 4; when a rest is needed, the user leans backwards against the backrest 12, the sliding mechanism 3 moves along the guide rail 2, and in the process that the backrest 12 moves along the arc-shaped section of the guide rail 2 along with the sliding mechanism 3, the user can generate horizontal displacement relative to the chair surface 11 and can rotate relative to the horizontal plane, and in the leaning process, due to the elastic action of the elastic supporting device 4, a certain attaching force is kept between the backrest 12 and the back of the human body, so that the backrest 12 and the clothes cannot be abutted against each other, and the clothes can move together relative to the backrest 12, and the clothes are prevented from slipping off the body surface of the human body; meanwhile, the backrest 12 moves relative to the seat 11, the space between the seat 11 and the backrest 12 is increased, the backrest can be attached to a human body, and the comfort level is improved.

An arc-shaped plate 17 is fixed at the end part of the chair seat 11 far away from the backrest 12, and the arc-shaped plate 17 bends downwards. When the staff sits on the seat surface 11, the legs can be placed on the arc-shaped plate 17, the arc-shaped plate 17 is arranged to be more fit with the human body, and the comfort level of the whole seat is improved.

Referring to fig. 1, 2 and 3, the lower portions of the two side surfaces of the guide rail 2 are respectively provided with a first guide groove 21 along the length direction; a second guide groove 22 is formed in the top surface of the guide rail 2 along the length direction of the guide rail, and the second guide groove 22 is specifically located in the middle of the guide rail 2 in the width direction.

Both ends of back 12 lower limb are fixed with the installation body 13 respectively downwardly extending, slide mechanism 3 includes first slip subassembly 31 and second slip subassembly 32, wherein, first slip subassembly 31 is provided with two sets ofly on each installation body 13, and establish respectively on the both sides surface of installation body 13, each first slip subassembly 31 of group all includes two connecting rods 311 and two first gyro wheels 312, the one end of two connecting rods 311 all articulates on installation body 13, it needs to explain, two connecting rods 311 articulate on same articulated shaft, the free end of two connecting rods 311 can open to both sides and form the V font, first gyro wheel 312 rotates the free end of connecting at two connecting rods 311 respectively, first gyro wheel 312 all slides and sets up in first guide way 21. The second sliding component 32 includes a vertical plate 321 and four second rollers 322, the vertical plate 321 is fixedly connected to the middle portion of the lower end surface of the installation body 13, the second rollers 322 are respectively rotatably connected to the two opposite side surfaces of the vertical plate 321, specifically, the second rollers 322 are respectively arranged on each side surface of the vertical plate 321 at intervals, and the four second rollers 322 are respectively slidably arranged in the second guide groove 22.

The first roller 312 and the second roller 322 are respectively arranged in the first guide groove 21 and the second guide groove 22, when the sliding mechanism 3 moves along the guide rail 2, the peripheral surface of the first roller 312 abuts against the top surface of the first guide groove 21, the peripheral surface of the second roller 322 abuts against the bottom surface of the second guide groove 22, and the sliding mechanism 3 is effectively positioned; because the two first rollers 312 are rotatably arranged on the connecting rods 311, and the two connecting rods 311 are hinged on the mounting body 13, in the process of transition from the straight section to the arc section of the guide rail 2, the angle between the two connecting rods 311 can be opened and closed in a micro range according to the movement track, and the sliding of the sliding mechanism 3 is smoother; at the same time, the backrest 12 cannot rotate relative to the guide rail 2 due to the support of the two first rollers 312.

Further, in each set of the first sliding assemblies 31, a first spring 313 is further disposed between the two connecting rods 311, receiving grooves 314 are respectively disposed on the surfaces of the two opposite sides of the two connecting rods 311, two ends of the first spring 313 are respectively abutted against the receiving grooves 314, and the first spring 313 is always in a compressed state. The first spring 313 can provide the pressing force to both sides of the two connecting rods 311, when the first sliding assembly 31 slides along the guide rail 2, the peripheral surfaces of the two first rollers 312 always abut against the top surface of the first guide groove 21, so that the first rollers 312 are prevented from shaking, the first rollers 312 and the second rollers 322 are clamped on the guide rail 2, and the movement stability is ensured.

Referring to fig. 4 and 5, a horizontal support plate 14 is fixed to a lower portion of the base 1, and a cross bar 15 is fixedly connected between lower end portions of the two mounting bodies 13. The elastic supporting device 4 comprises a cylinder 41, a pressure plate 42, a rod 43 and a second spring 44, wherein the bottom of the cylinder 41 is hinged with the supporting plate 14; the pressure plate 42 is arranged in the cylinder 41, the side surface of the pressure plate 42 is attached to the inner wall of the cylinder 41, and the pressure plate 42 slides along the axial direction of the cylinder 41; one end of the rod body 43 is fixedly connected to the pressure plate 42, the other end of the rod body 43 penetrates out of the cylinder body 41, the rod body 43 can slide along the axial direction of the cylinder body 41, and one end, away from the pressure plate 42, of the rod body 43 is hinged with the cross rod 15; the second spring 44 is located in the cylinder 41, one end of the second spring 44 abuts against the bottom wall of the cylinder 41, the other end abuts against the pressing plate 42, the second spring 44 is always in a compressed state, and in a normal state, under the elastic force of the second spring 44, the rod 43 extends outwards.

It should be noted that, the cylinder 41 and the rod 43 are both arranged obliquely, when a person leans back on the backrest 12, the backrest 12 moves along the guide rail 2, the rod 43 retracts into the cylinder 41 and compresses the second spring 44, the specific position of the backrest 12 depends on the state of the back of the person, and when the backrest 12 stays at a certain position, the pressure of the back of the person on the backrest 12 and the elastic force of the second spring 44 are in a relatively balanced state. When a person wants to get up, the second spring 44 will generate a pushing force to the back of the person due to the elastic potential energy stored in the second spring 44, and the person can get up more easily under the pushing force of the second spring 44.

Furthermore, the elastic supporting device 4 is uniformly provided with a plurality of groups along the direction perpendicular to the track of the guide rail 2, so that the supporting and rebounding effects on the backrest 12 can be effectively improved, and the stability of the whole structure is improved.

The upper surface of the base 1 is fixedly connected with a plurality of upright posts 16, the chair surface 11 is fixedly connected with the top end parts of the upright posts 16, and a gap is formed between the chair surface 11 and the upper surface of the base 1; similarly, the seat 11 includes a straight portion parallel to the upper surface of the base 1 and an arc portion smoothly connected to an end of the straight portion, and the seat 11 is inserted between the lower end surface of the backrest 12 and the crossbar 15. Seat 11 is higher than the upper surface of base 1, can close the top at horizontal pole 15 and elastic support device 4, effectively protects horizontal pole 15 and elastic support device 4, improves whole seat structure's pleasing to the eye degree simultaneously.

The supporting plate 14 is also fixed with an air storage bag 5, the bottom of the cylinder body 41 is connected with a conduit 45, one end of the conduit 45 is communicated with the inside of the cylinder body 41, and the other end is connected to the air storage bag 5 and is communicated with the inside of the air storage bag 5. The inside of the air reservoir 5 is communicated with the inside of the cylinder 41 through a conduit 45, so that air can be pressed into the air reservoir 5, when the backrest 12 moves along the guide rail 2 to compress the second spring 44, the air in the cylinder 41 is pressed into the air reservoir 5, and the air reservoir 5 stores air pressure which can generate thrust on the pressing plate 42 when the user stands up. The cooperation of gas storage bag 5 and second spring 44 can further improve the supplementary resilience effect of elastic support device 4, improves whole support and resilience effect, also avoids long-term use simultaneously in, the fatigue failure of second spring 44.

An overflow valve 51 is further installed at one end of the gas storage bag 5, the overflow valve 51 is used for controlling the pressure of compressed air in the gas storage bag 5, and when the air pressure reaches a set value, air in the gas storage bag 5 is released, so that accidents caused by overhigh air pressure in the gas storage bag 5 are prevented, and the safety is improved.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.