CN216724996U - Shifting device - Google Patents

Abstract

The utility model provides a shifting device which is used for transferring patients in different indoor scenes and comprises a base, a lifting device and a seat, wherein the base and the seat are respectively and fixedly connected with two ends of the lifting device, and the height of the seat relative to the base is adjusted through the lifting device; the lifting device comprises a lifting component and a driving component, the pressure intensity in the lifting component is adjusted by pressing the driving component in a first mode so as to drive the seat to ascend, and the pressure intensity in the lifting component is adjusted by pressing the driving component in a second mode so as to drive the seat to descend. The height-adjustable chair is simple in structure, patients can be adjusted in height on the chair, the operation efficiency is high, the physical burdens of nursing personnel and the patients are greatly reduced, meanwhile, the height difference can be avoided, the rubbing and collision injury accidents caused by the height difference of the patients in the shifting process are prevented, and the safety is improved.

Description

Shifting device

Technical Field

The embodiment of the utility model relates to the technical field of medical instruments, in particular to a shifting device.

Background

The shifting device is mainly used indoors, and can shift patients who are disabled by legs and feet due to disabilities or half paralysis in different indoor scenes, so that physical burden of nursing personnel during manual shifting is relieved, and risk of secondary injury caused by the patients during the manual shifting process can be greatly reduced. When the patient uses the shifting device, the height of the seat needs to be adjusted according to different indoor scenes (such as a bed, a sofa or a closestool, and the like) so as to safely transfer the patient from the shifting chair to the indoor scenes.

At present, the height of the seat is adjusted manually by the conventional shifting device, and then the height is fixed by a screw locking mode. However, such adjustment of the prior art shifting device requires the patient to leave the chair for a short time or to adjust the height of the chair before the patient uses the chair, which greatly increases the physical burden of the caregiver and the patient on the repeated up and down movement.

Moreover, because the height of the seat can not be adjusted by the patient on the existing shifting device, the height of the seat can not be efficiently and accurately adjusted to the height of an indoor scene every time, the height adjustment precision is insufficient, height difference is generated, the patient can be rubbed and collided with the seat due to the height difference in the shifting process, and the use risk is caused.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a novel shifting device aiming at the problems that the physical burden of nursing staff and patients is increased, the height adjustment precision is insufficient and the use risk exists when the conventional shifting device is used.

The technical solution for solving the above technical problems is to provide a shifting device for transferring patients in different indoor scenes, which comprises a base, a lifting device and a seat, wherein the base and the seat are respectively and fixedly connected to two ends of the lifting device, and the height of the seat relative to the base is adjusted by the lifting device;

the lifting device comprises a lifting component and a driving component, the pressure intensity in the lifting component is adjusted by pressing the driving component in a first mode so as to drive the seat to ascend, and the pressure intensity in the lifting component is adjusted by pressing the driving component in a second mode so as to drive the seat to descend.

Preferably, the lifting assembly is vertically arranged, the top end of the lifting assembly is fixedly connected to the seat, and the bottom end of the lifting assembly is fixedly connected to the base.

Preferably, the lifting device comprises a scissor type lifting frame, the bottom end of the scissor type lifting frame is fixed with the base, and the top end of the scissor type lifting frame is fixed with the seat;

the scissor type lifting frame comprises a transmission main body formed by overlapping at least one group of X-shaped arranged arm frames, and the driving assembly and the lifting assembly adjust the height of the seat relative to the base by adjusting the angle of the arm frames.

Preferably, the seat comprises a seat surface portion, a backrest portion and a footrest portion, the seat surface portion is located between the backrest portion and the footrest portion, and the lifting assembly is fixedly connected to the seat surface portion;

a first adjusting assembly is arranged between the chair surface part and the backrest part, and the angle between the backrest part and the chair surface part is adjusted by the first adjusting assembly; a second adjusting component is arranged between the chair face part and the foot support part, and the angle between the foot support part and the chair face part is adjusted by the second adjusting component.

Preferably, the base includes chassis and fixed connection in a plurality of gyro wheel components of the bottom surface of chassis, the top surface of chassis is equipped with the installation department, just elevating gear is through assembling the mode of installation department is fixed on the base.

Preferably, the shifting device comprises armrests arranged on two sides of the seat in the width direction, and the armrests are fixedly connected with the seat in a rotatable manner; the seat is provided with a locking member, and the armrest is locked and fixed through the locking member when being adjusted to a preset position.

Preferably, the drive assembly comprises a drive piston and a drive foot bar, wherein: the driving foot rod is movably connected with the lifting device and is pivoted and fixed with one end of the driving piston; the lifting device presses the driving component in a first mode or a second mode through the driving foot rod so as to adjust the pressure in the lifting component.

Preferably, the lifting assembly comprises a lifting piston, a driving cylinder, a hydraulic cylinder and a reserve cylinder for storing oil, the reserve cylinder is communicated with the driving cylinder through a reverse valve, the driving cylinder is communicated with the hydraulic cylinder through a reverse valve, and at least one part of the lifting piston is arranged in the hydraulic cylinder;

at least one part of the driving piston is installed in the driving cylinder, and when the driving foot rod is pressed in a first mode, the driving piston does reciprocating motion, so that oil in the oil storage cylinder flows into the hydraulic cylinder through the driving cylinder, the hydraulic cylinder is pressurized to push the lifting piston to extend out, and the seat is driven to ascend.

Preferably, the lifting device further comprises a switch assembly and a pipeline communicating the hydraulic cylinder and the reserve cylinder, and the switch assembly is blocked in the pipeline; and when the driving assembly is pressed in a second mode, the driving piston drives the switch assembly to open the pipeline, so that oil in the hydraulic cylinder flows into the oil storage cylinder through the pipeline to reduce the pressure of the hydraulic cylinder.

The shifting device of the embodiment of the utility model has the following beneficial effects: the lifting assembly and the driving assembly are arranged, the pressure in the lifting assembly is adjusted in a manner of pressing the driving assembly to adjust the height of the seat, so that the lifting and descending of the seat are realized, the structure is simple, the height of a patient on the seat can be adjusted, the patient does not need to be adjusted in advance or be helped to leave the seat for a short time, the height adjusting efficiency is improved, the physical burden of nursing personnel and the patient can be greatly reduced, the use practicability is improved, and the shifting device has higher market competitiveness; because the patient does not need to leave the seat during the adjustment operation and the height adjustment is carried out by adopting the pressure intensity adjustment mode, the ascending and descending of the seat can be more reliable and stable, the seat can be more accurately corresponding to the height of an indoor scene, the height difference is avoided, the adjustment precision is improved, the rubbing and collision injury accidents caused by the height difference of the patient in the displacement process are prevented, and the use risk is reduced; and, through pressing drive assembly with first mode and second mode and realizing the rising decline of seat, effectively reduced the operation degree of difficulty, the mode that can also avoid the maloperation simultaneously improves the operation security.

Drawings

Fig. 1 is a schematic structural diagram of a displacement device provided in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a scissor lift according to an embodiment of the utility model;

FIG. 3 is a schematic structural diagram of a displacement device according to another embodiment of the present invention;

fig. 4 is a schematic view showing a state change of angle adjustment of the seat surface portion, the backrest portion, and the footrest portion according to the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Fig. 1 is a schematic structural diagram of a displacement device provided in an embodiment of the present invention, which can be applied to the technical field of medical equipment, such as a special displacement chair for a patient with disability or half paralysis causing leg and foot disability, for transferring the patient in different indoor scenes.

The shifting device of the embodiment comprises a base 1, a lifting device 2 and a seat 3, wherein the base 1 and the seat 3 are respectively and fixedly connected to two ends of the lifting device 2, and the height of the seat 3 relative to the base 1 is adjusted through the lifting device 2. The specific structure of the lifting device 2 can be set according to practical situations, for example, a hydraulic mechanism, a pneumatic mechanism, a hydraulic mechanism and a transmission mechanism, or a pneumatic mechanism and a transmission mechanism.

Specifically, the lifting device 2 includes a lifting assembly 21 and a driving assembly 22, and the driving assembly 22 is adapted and connected to the lifting assembly 21. In operation, when the driving assembly 22 is pressed in the first manner, the pressure in the lifting assembly 21 can be adjusted (e.g., the pressure in the lifting assembly 21 can be increased), and the lifting assembly 21 drives the seat 3 to ascend. When the driving assembly 22 is pressed in the second manner, the pressure in the lifting assembly 21 can be adjusted (e.g. the pressure in the lifting assembly 21 is reduced), and the lifting assembly 21 drives the seat 3 to descend (or simultaneously the seat 3 descends by the patient's body weight). Of course, in practical applications, the output end of the lifting assembly 21 (specifically, the end far away from the lifting device 2) may be directly connected to the seat 3, or may be fixedly connected to the seat 3 through a transmission mechanism (i.e., the transmission mechanism drives the seat 3 to lift).

The specific implementation manners of the first mode and the second mode can be determined according to actual conditions; for example, the first way is normal pressing, i.e. pressing the driving member 22 for a short time to pressurize the elevating member 21; the second way is to depressurize the lifting unit 21 by triggering a reset switch of the lifting unit 21 (the reset switch is a unit for returning the lifting unit 21 to its original state, for example, an elastic depressurizing unit that is opened/closed at a communication part between the lifting unit 21 and the outside or another member) when the driving unit 22 is continuously depressed for a predetermined time (for example, 3 seconds).

Or the first mode is common pressing; the second way is to drive the lifting assembly 21 to reach a preset state (for example, reach a preset height), that is, the lifting assembly 21 is driven by the driving assembly 22 to reach the preset state and then trigger the reset switch; for example, a flexible pulling member is disposed between the lifting portion of the lifting assembly 21 and the reset switch, the lifting portion of the lifting assembly 21 lifts to drive the flexible pulling member, and when the lifting portion reaches a preset height, the flexible pulling member pulls to trigger the reset switch. Of course, in practical applications, the second mode may also be set by using an inductor or a timer.

Above-mentioned shifter is through setting up lifting unit 21 and drive assembly 22, adjust the seat 3 height with the pressure in the mode adjustment lifting unit 21 that presses drive assembly 22, realize the rising or the decline of seat 3, this simple structure, and the disease is in also can carry out altitude mixture control on seat 3, need not adjustment in advance or help the disease to briefly leave seat 3, the efficiency of altitude mixture control has both been improved, again can the physical strength burden of greatly reduced nursing staff and disease, the practicality of use is improved, make above-mentioned shifter more have market competition simultaneously.

Because the patient need not to leave seat 3 during the regulation operation, and has adopted the mode of adjustment pressure to carry out altitude mixture control to not only can make the rising or the decline of seat 3 more reliable steady, can also make the height that corresponds indoor scene of seat 3 more accurate simultaneously, avoid producing the difference in height, improve the regulation precision, prevent that the patient from hitting the injury accident because of the friction that the difference in height caused at the aversion in-process, reduce the risk hidden danger.

In addition, the shifting device presses the driving component 22 in the first mode and the second mode to realize the ascending or descending of the seat 3, thereby effectively reducing the operation difficulty, avoiding the occurrence of misoperation and improving the use safety. Of course, in order to reduce the probability of malfunction, the first and second modes should have operational differences.

In an embodiment of the present invention, the lifting unit 21 is disposed along the vertical direction, the top end of the lifting unit 21 is fixedly connected to the seat 3, and the bottom end of the lifting unit 21 is fixedly connected to the base 1, so that the lifting unit 21 directly drives the seat 3 to ascend and descend under the driving of the driving unit 22, and the structure is simple and reasonable.

In another embodiment of the present invention, as described with reference to fig. 2, the lifting device 2 comprises a scissor-type crane 23, and the bottom end of the scissor-type crane 23 is fixed to the base 1, and the top end of the scissor-type crane 23 is fixed to the seat 3. The lifting component 21 is connected with the scissor type lifting frame 23, and the lifting component 21 drives the scissor type lifting frame to move under the action of the driving component 22 so as to drive the seat 3 to ascend or descend.

Further, the scissor-type lifting frame 23 comprises a transmission main body formed by overlapping at least one group of arm frames arranged in an X shape, and the driving component 22 and the lifting component 21 adjust the height of the seat 3 relative to the base 1 by adjusting the angle of the arm frames.

As shown in connection with fig. 3, the scissor lift 23 of the present embodiment includes two transmission bodies corresponding to both sides of the seat 3.

Certainly, in practical application, the number of the arm supports of the transmission main body of the scissor-type lifting frame 23 can be specifically determined according to practical situations, for example, the arm supports are formed by overlapping one group, two groups or three groups of arm supports, and preferably one group of arm supports is adopted, so that the structural design can be effectively simplified.

In order to make the seat 3 more stable in the ascending or descending process, the lifting device 2 can be provided with a guide mechanism for limiting the seat 3; for example, a vertically arranged guide rod is arranged below the seat 3, a limit ring sleeve matched with the guide rod is arranged above the fixed part of the lifting device 2, the guide rod is inserted into the limit ring sleeve, and the limit ring sleeve is used for limiting and guiding the guide rod and the seat 3, so that the stress of the scissor-type lifting frame 23 in the transverse direction is reduced, and the stability and the reliability are improved.

In another embodiment of the utility model, as shown in fig. 4, the seat 3 comprises a seat surface portion 31, a backrest portion 32 and a footrest portion 33, the seat surface portion 31 is located between the backrest portion 32 and the footrest portion 33, and the lifting assembly is fixedly connected to the seat surface portion 31.

Furthermore, a first adjusting component 34 (e.g., a gear transmission structure) is provided between the seat portion 31 and the backrest portion 32, and the angle between the backrest portion 32 and the seat portion 31 is adjusted by the first adjusting component 34, that is, the angle between the backrest portion 32 and the seat portion 31 can be adjusted by driving the first adjusting component 34, so that the backrest portion 32 can be raised or lowered to adjust the posture of the upper body of the patient. In addition, a second adjusting component 35 (e.g., a gear transmission structure) is disposed between the chair surface portion 31 and the footrest portion 33, and the angle between the footrest portion 33 and the chair surface portion 31 is adjusted by the second adjusting component 35, that is, the angle between the footrest portion 33 and the chair surface portion 31 can be adjusted by driving the second adjusting component 35, so as to support the lower limbs of the patient and adjust the posture of the lower limbs of the patient.

Above-mentioned seat 3 can satisfy in the different demands of the curved angle of stretching of different disease limbs through setting up first adjusting part 34 and second adjusting part 35, improves the controllability to for its most comfortable limbs posture of disease custom-built, promote the travelling comfort of disease at the shifter who uses this embodiment like this greatly, avoid the patient to be in seat 3 for a long time and produce physiological burden.

Of course, the seat 3 may further include a neck support 36, the neck support 36 is located at an end of the backrest 32 away from the seat surface 31, a third adjusting assembly 37 is disposed between the neck support 36 and the backrest 32, and an angle between the neck support 36 and the backrest 32 is adjusted by the third adjusting assembly 37, so as to achieve the function of adjusting the head posture of the patient.

The structural design of the first adjusting assembly 34 can be set according to actual conditions; for example, the first adjustment assembly 34 includes a drive assembly 22 and a lock assembly mounted on the seat portion 31, respectively, and the backrest portion 32 is connected to the seat portion 31 through the drive assembly 22. The drive assembly 22 includes a mounting housing, a first gear member and a second gear member rotatably mounted within the mounting housing, and the first gear member and the second gear member are in meshing engagement or are in meshing engagement via a third gear member. Specifically, the mounting shell is assembled on the seat surface portion 31, the first gear member is fixedly connected with one end of the backrest portion 32, and the second gear member is locked by the locking assembly, when the adjustment operation is performed, only the locking assembly needs to be opened, then the second gear member is driven, and the second gear member drives the first gear member and the backrest portion 32 to rotate, so that the angle adjustment between the backrest portion 32 and the seat surface portion 31 is realized.

The structural design of the second adjusting assembly 35 can be set according to actual conditions; for example, the second adjusting component 35 is a ratchet structure, so that the footrest part 33 can freely rotate around the second adjusting component 35 toward the upper side of the chair surface part 31 to adjust the angle between the footrest part 33 and the chair surface part 31, and the rotation of the footrest part 33 in the direction away from the upper side of the chair surface part 31 is limited and locked by the ratchet mechanism, thereby supporting the lower limbs of the patient.

The structural design of the third adjusting component 37 can be set according to actual conditions; for example, the third adjusting assembly 37 includes a pivot body provided on the neck rest portion 36, and two pivot members assembled to the backrest portion 32, and the pivot body is assembled between the two pivot members and pivotally fixed to the two pivot members by a pin. And two sides of the pivoting main body are respectively close to the inner sides of the two pivoting members, the inner side of each pivoting member is provided with a semicircular bulge, the two sides of the pivoting main body are respectively provided with a plurality of limiting holes distributed around the central line of the pin shaft, and when the pivoting main body is assembled between the two pivoting members, the semicircular bulge on the inner side of each pivoting member is clamped into one limiting hole on the side of the pivoting main body so as to adjust the angle between the neck support part 36 and the backrest part 32.

In one embodiment of the present invention, the base 1 includes a base frame 11, and a plurality of roller members 12 fixedly coupled to a bottom surface of the base frame 11, a top surface of the base frame 11 is provided with a mounting portion, and the lifting device 2 is fixed to the base 1 by being fitted to the mounting portion.

Specifically, each roller member 12 includes a rotating wheel and a connecting rod having one end pivotally connected to the rotating wheel, and each roller is fixed to the bottom of the base frame 11 in a vertically slidable manner through the connecting rod; a spring element is connected between the connecting rod of each roller member 12 and the base frame 11, and exerts a spring force on the base frame 11 in a direction away from the rotating wheel.

The shifting device of this embodiment further comprises a braking assembly, the braking assembly comprises a plurality of braking members mounted on the bottom of the base frame 11 and corresponding to the plurality of roller members 12, and the base frame 11 overcomes the spring force applied by the spring member when the seat 3 bears the weight to drive the braking members to move downwards, so that the plurality of braking members press the rotating wheels of the plurality of roller members 12 to limit the movement of the plurality of roller members 12, thereby achieving the braking function.

Specifically, each brake member includes a brake pad and an elastic member, and the brake pad is fixed to the bottom surface of the base frame 11 by the elastic member assembly and is pressed against the rotating wheel of the corresponding roller member 12 when the seat 3 bears a load. Further, the brake assembly further comprises a wire tube, a brake cable arranged in the wire tube, and a driving switch for driving the brake cable to slide in the wire tube, wherein a first end of the brake cable is fixedly connected with the driving switch, and a second end of the brake cable is fixedly connected with the plurality of brake members, so that the brake cable can drive and pull the plurality of brake members through the driving switch, and the plurality of brake members move in a direction away from the roller members 12, so that the plurality of brake members are separated from the corresponding roller members 12 to release the brake.

The above-mentioned displacement means includes armrests 38 provided on both sides of the seat 3 in the width direction, and the armrests 38 are fixedly connected to the seat 3 in a rotatable manner. The seat 3 is provided with a locking member by which the armrest 38 is locked in place when adjusted to a predetermined position. When the patient needs to leave the seat 3, the armrest 38 can be rotated to below the seat 3 to avoid obstructing or hooking the patient's clothes.

Specifically, the driving assembly 22 of the present embodiment includes a driving piston and a driving leg 221, wherein the driving leg 221 is movably connected to the lifting device 2 (for example, one end of the driving leg 221 is pivotally connected to the lifting device 2 through a pin), and the driving leg 221 is pivotally connected to one end of the driving piston. Therefore, the lifting device 2 can press the driving assembly 22 in the first mode or the second mode by driving the foot rod 221, so as to adjust the pressure in the lifting assembly 21, which is beneficial to improving the convenience of operation. Particularly, an elastic restoring member is disposed between the driving leg 221 and the driving assembly 22, so that when the driving leg 221 is pressed, the driving leg 221 can restore to the original position under the elastic force of the elastic restoring member, thereby achieving automatic restoration and reducing the difficulty of driving operation.

In addition, the lifting assembly 21 of the present embodiment includes a lifting piston, a driving cylinder, a hydraulic cylinder, and a reserve cylinder for storing oil, the reserve cylinder being communicated with the driving cylinder through a reverse valve, the driving cylinder being communicated with the hydraulic cylinder through a reverse valve, and at least a portion of the lifting piston being installed in the hydraulic cylinder. And, at least a part of the driving piston is installed in the driving cylinder, and when the driving foot lever 221 is pressed in a first manner, the driving piston makes a reciprocating motion, so that the oil in the oil storage cylinder flows into the hydraulic cylinder through the driving cylinder, pressurizes the hydraulic cylinder to push the lifting piston to extend, and drives the seat 3 to rise.

Further, the lifting device 2 further comprises a switch assembly and a pipeline for communicating the hydraulic cylinder and the reserve cylinder, and the switch assembly is blocked in the pipeline. Thus, when the driving unit 22 is pressed in the second mode, the piston is driven to drive the opening and closing unit to open the pipe, so that the oil in the hydraulic cylinder flows into the reservoir cylinder through the pipe, and the hydraulic cylinder is depressurized.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (8)

1. A shifting device is used for transferring patients in different indoor scenes and is characterized by comprising a base, a lifting device and a seat, wherein the base and the seat are respectively and fixedly connected with two ends of the lifting device, and the height of the seat relative to the base is adjusted through the lifting device;

the lifting device comprises a lifting component and a driving component, the pressure intensity in the lifting component is adjusted by pressing the driving component in a first mode so as to drive the seat to ascend, and the pressure intensity in the lifting component is adjusted by pressing the driving component in a second mode so as to drive the seat to descend;

the lifting assembly comprises a lifting piston, a driving cylinder, a hydraulic cylinder and a reserve cylinder for storing oil, the reserve cylinder is communicated with the driving cylinder through a reverse valve, the driving cylinder is communicated with the hydraulic cylinder through a reverse valve, and at least one part of the lifting piston is arranged in the hydraulic cylinder;

the driving assembly comprises a driving piston and a driving foot rod, the driving foot rod is movably connected with the lifting device, and the driving foot rod is pivoted and fixed with one end of the driving piston; at least one part of the driving piston is installed in the driving cylinder, and when the driving foot rod is pressed in a first mode, the driving piston does reciprocating motion, so that oil in the oil storage cylinder flows into the hydraulic cylinder through the driving cylinder, the hydraulic cylinder is pressurized to push the lifting piston to extend out, and the seat is driven to ascend.

2. The displacement apparatus of claim 1, wherein the lifting assembly is vertically disposed and has a top end fixedly connected to the seat and a bottom end fixedly connected to the base.

3. The shifter of claim 1, wherein the lifting device comprises a scissor lift, a bottom end of the scissor lift is fixed to the base, and a top end of the scissor lift is fixed to the seat;

the scissor type lifting frame comprises a transmission main body formed by overlapping at least one group of X-shaped arranged arm frames, and the driving assembly and the lifting assembly adjust the height of the seat relative to the base by adjusting the angle of the arm frames.

4. The displacement apparatus of claim 2, wherein the seat comprises a seat portion, a backrest portion, and a footrest portion, the seat portion being located between the backrest portion and the footrest portion, and the lifting assembly being fixedly connected to the seat portion;

a first adjusting component is arranged between the chair face part and the backrest part, and the angle between the backrest part and the chair face part is adjusted by the first adjusting component; a second adjusting component is arranged between the chair face part and the foot support part, and the angle between the foot support part and the chair face part is adjusted by the second adjusting component.

5. The displacement apparatus as claimed in claim 1, wherein the base includes a bottom frame, and a plurality of roller members fixedly coupled to a bottom surface of the bottom frame, a top surface of the bottom frame is provided with a mounting portion, and the lifting device is fixed to the base by being fitted to the mounting portion.

6. The shifting apparatus according to claim 1, wherein the shifting apparatus comprises armrests provided on both sides of the seat in a width direction thereof, and the armrests are fixedly connected with the seat in a rotatable manner; the seat is provided with a locking member, and the armrest is locked and fixed through the locking member when being adjusted to a preset position.

7. The displacement apparatus of claim 1, wherein the lifting device presses the drive assembly in a first manner or a second manner via the drive foot to adjust a pressure within the lifting assembly.

8. The displacement apparatus of claim 1, wherein the lifting device further comprises a switch assembly and a conduit communicating the hydraulic cylinder and reserve cylinder, and the switch assembly is blocked within the conduit; and when the driving assembly is pressed in a second mode, the driving piston drives the switch assembly to open the pipeline, so that oil in the hydraulic cylinder flows into the oil storage cylinder through the pipeline to reduce the pressure of the hydraulic cylinder.

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