CN215132183U

CN215132183U - Shifting device

Info

Publication number: CN215132183U
Application number: CN202121080094.XU
Authority: CN
Inventors: 林进田; 廖家生
Original assignee: Lainkaer Kunshan Health Technology Co ltd
Current assignee: Lainkaer Kunshan Health Technology Co ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-12-14
Anticipated expiration: 2031-05-19

Abstract

The utility model provides a shifting device for transferring patients in different indoor scenes, which comprises a driving device, a scissor-type lifting frame, and a seat and a shifting base which are respectively and fixedly connected with the two ends of the scissor-type lifting frame, wherein the scissor-type lifting frame comprises a lifting main body formed by superposing at least one group of X-shaped arm supports; the driving device comprises a transmission assembly and a rotatable member fixedly connected with the transmission assembly, and the transmission assembly adjusts the angle of the arm support under the driving of the rotatable member, so as to adjust the height of the seat relative to the shifting base. The utility model discloses only need drive rotatable component can realize the rising decline of seat, need not the bearing and can reduce the seat height, solved the trouble problem of seat altitude mixture control, reduced the operation degree of difficulty, not only make the controllability of operation higher, can also accomplish accurate regulation, and simple structure, low in manufacturing cost can effectively improve market competition.

Description

Shifting device

Technical Field

The embodiment of the utility model provides a relate to medical instrument technical field, more specifically say, relate to a shift unit.

Background

The shifting device is mainly used indoors, and can shift patients with leg and foot disabilities caused by half paralysis in different indoor scenes, so that the physical burden of nursing personnel during manual shifting is relieved, and the risk of secondary injury caused by the patients during the manual shifting 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 mode that the shifter in the market was many through setting up the force pump realizes the altitude mixture control to the seat, specifically the handle through the drive force pump is with the pressure in the adjustment force pump to jacking seat, then through the drive force pump, and make the seat bear and set for weight in order to reduce the seat, realize the altitude mixture control of seat from this.

However, since the pressure pump is not inexpensive, the conventional displacement device using the pressure pump is expensive to manufacture, which is disadvantageous in cost control. And, current shifter needs the bearing to predetermine weight when reducing the seat height to lead to the altitude mixture control of seat comparatively troublesome, increased the operation degree of difficulty, and the controllability of operation is low, can't accomplish accurate regulation, reduced the practicality of using.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a to the problem that manufacturing cost is high, the seat of above-mentioned current shift unit is adjusted troublesome, the operation degree of difficulty is big, the controllability of regulation is low, unable accurate regulation and the practicality of use is low, provide a shift unit.

The embodiment of the present invention provides a shifting device for transferring patients in different indoor scenes, which comprises a driving device, a scissor-type lifting frame, and a seat and a shifting base which are respectively and fixedly connected to two ends of the scissor-type lifting frame, wherein the scissor-type lifting frame comprises a lifting main body formed by stacking at least one group of arm frames arranged in an X-shape; the driving device comprises a transmission assembly and a rotatable member fixedly connected with the transmission assembly, and the transmission assembly is driven by the rotatable member to adjust the angle of the arm support, so that the height of the seat relative to the shifting base is adjusted.

Preferably, each group of arm supports comprises a first arm lever and a second arm lever which are arranged in an X shape, the centers of the first arm lever and the second arm lever are pivoted and fixed through a first pin shaft, the first end of the first arm lever is pivoted and fixed with the shifting base through a second pin shaft, and the first end of the second arm lever is pivoted and fixed with the seat through a third pin shaft;

the lifting main body further comprises a first slide rail fixed to the bottom of the seat and a second slide rail fixed to the shifting base, the second end of the first arm rod is connected with the seat in a sliding mode through the first slide rail, and the second end of the second arm rod is connected with the shifting base in a sliding mode through the second slide rail; when the included angle between first armed lever and the second armed lever changes, the second end of first armed lever is followed first slide rail slides, the second end of second armed lever is followed the second slide rail slides.

Preferably, the transmission assembly comprises a nut fixed to the second arm rod, a screw rod matched with the nut, and the rotatable member is fixedly connected with the screw rod;

the screw is rotatably fixed to the displacement base, the seat or the first arm, is in threaded engagement with the nut, and is driven to rotate by the rotatable member to adjust the relative position of the nut and the screw, and thus the angle between the first arm and the second arm.

Preferably, the shifting base, the seat or the second arm rod is provided with a pivoting hole, the outer wall of the screw rod is provided with an annular groove matched with the pivoting hole, and the shifting base, the seat or the second arm rod can be rotatably connected in a mode that the annular groove is matched with the pivoting hole.

Preferably, the transmission assembly comprises a nut fixed to the seat or shifting base, a screw fitted to the nut, and the rotatable member is fixedly connected to the screw;

the screw rod is in threaded fit with the nut, the end part of the screw rod is fixedly connected with the first arm rod or the second arm rod in a rotatable mode, and the screw rod is driven by the rotatable component to move relative to the nut, so that the angle of the arm support is driven to be adjusted.

Preferably, the scissor type lifting frame comprises two groups of lifting main bodies corresponding to two sides of the seat and two groups of driving connecting rods fixedly connected with second ends of second arm rods of the lifting main bodies respectively, the transmission assembly is fixedly connected with the driving connecting rods and drives the driving connecting rods to drive the second ends of the second arm rods of the lifting main bodies to move synchronously, and then the angles of arm frames of the two groups of lifting main bodies are adjusted.

Preferably, the first slide rail and the second slide rail are arranged along the horizontal direction, and the first arm lever comprises a first slide block mounted at the second end through a pin shaft and slides in cooperation with the first slide rail through the first slide block; the second arm rod comprises a second sliding block which is arranged at the second end through a pin shaft, and the second sliding block and the second sliding rail are matched to slide.

Preferably, the first arm levers of the two lifting main bodies are positioned on the inner side, and a plurality of reinforcing connecting rods are connected between the two first arm levers of the two lifting main bodies.

Preferably, the screw and the nut are both arranged along the horizontal direction and are parallel to the arrangement direction of the lifting body;

the outer wall of the screw is provided with an external thread arranged along the length direction of the screw, the external thread is matched with the internal thread of the nut, and the screw is in transmission connection with the nut in a mode that the external thread is matched with the internal thread; the end of the screw rod is provided with a limiting part.

Preferably, the displacement base is provided with a first shaft sleeve matched with the screw rod, and the screw rod is rotatably fixed on the displacement base through being matched with the first shaft sleeve;

the outer wall of the screw rod is sleeved with a second shaft sleeve and a fixed limiting ring, the second shaft sleeve is located between the first shaft sleeve and the rotatable component, the limiting ring is located on one side, back to the second shaft sleeve, of the first shaft sleeve, and is limited to the two ends of the first shaft sleeve through the second shaft sleeve and the limiting ring so as to prevent the screw rod from moving relative to the second shaft sleeve.

The utility model discloses shift unit has following beneficial effect: by arranging the scissor-fork type lifting frame and the driving device, the driving device can be used for driving to adjust the angle of the arm support of the scissor-fork type lifting frame, so that the function of adjusting the height of the seat is achieved, the operation is simple and convenient, the lifting and the descending of the seat can be realized only by driving the rotatable component, the height of the seat can be reduced without bearing, and the problem of trouble in adjusting the height of the seat is effectively solved, so that the operation difficulty is reduced, the convenience in operation is improved, the controllability in operation is higher, the accurate adjustment can be realized, the stability and the reliability in the lifting process are higher, the discomfort caused by adjusting the height of the seat to a patient is avoided, the psychological burden of the patient is reduced, and the practicability in use is improved; moreover, the shifting device effectively replaces a pressure pump by arranging the scissor type lifting frame, not only can the structural design be simplified, but also the manufacturing cost can be greatly reduced, so that the cost control is facilitated, and the market competitiveness of the shifting device is improved.

Drawings

Fig. 1 is a schematic structural diagram of a displacement device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in 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 invention and are not intended to limit the invention.

Fig. 1 is a schematic structural diagram of a shifting device according to an embodiment of the present invention, which can be applied to the technical field of medical devices, such as a special shifting chair for patients with disabilities or semi-paralysis causing disabilities in legs and feet, for transferring patients in different indoor scenes.

The shifting device in the embodiment comprises a driving device 1, a scissor type lifting frame 2, a seat 3 and a shifting base 4, wherein the seat 3 and the shifting base 4 are respectively and fixedly connected to two ends of the scissor type lifting frame 2, and the seat 3 and the scissor type lifting frame 2 are transferred through the shifting base 4. The shifting base 4 specifically comprises an underframe and a plurality of rollers (the rollers are preferably universal wheels) arranged at the bottom of the underframe, so that the shifting function of the shifting base 4 can be realized by rolling the plurality of rollers on the ground.

The scissor type lifting frame 2 comprises a lifting main body 21, the lifting main body 21 is formed by overlapping at least one group of X-shaped arm supports 211, and the number of the arm supports 211 can be determined according to actual conditions so as to ensure the structural strength of the lifting main body 21.

The driving device 1 of the embodiment comprises a transmission assembly 11 and a rotatable member 12, wherein the rotatable member 12 is connected with the input end of the transmission assembly 11, and the output end of the transmission assembly 11 is connected with the scissor type lifting frame 2. In performing the height adjustment of the seat 3, the rotatable member 12 may be rotated, and the lifting body 21 is driven by the transmission assembly 11 to adjust the angle of the arm support 211, so that the height of the seat 3 with respect to the shifting base 4 can be adjusted. In practical applications, the structural design of the rotatable member 12 may be specifically determined according to practical situations; for example: the rotatable member 12 may be one of an L-handle lever, a Z-handle lever, and a handwheel member.

Because the arm support 211 is arranged in an X shape, when the arm support 211 is arranged vertically, the size of the arm support 211 in the horizontal direction is inversely proportional to the size of the arm support 211 in the vertical direction, and the angle between two adjacent included angles is inversely proportional, so that the size of the arm support 211 in the vertical direction can be changed and compared, and the height of the seat 3 relative to the shifting base 4 can be adjusted. Moreover, the scissor-type lifting frame 2 is simple and reasonable in structure, does not occupy a large space, can reduce the volume of the shifting device, can effectively reduce the weight, can reduce the stress of the shifting base 4, and is favorable for pushing the shifting device, so that the burden of medical staff is reduced.

Above-mentioned shifter is through setting up scissor type crane 2 and drive arrangement 1, consequently can be driven in order to adjust the angle of scissor type crane 2's cantilever crane 211 by drive arrangement 1, thereby reach the altitude mixture control function to seat 3, easy operation is convenient, and only need drive rotatable component 12 can realize the rising decline of seat 3, it can reduce seat 3 height to need not the bearing, effectively solve the trouble problem of seat 3 altitude mixture control, thereby reduce the operation degree of difficulty, improve the convenience of operation, not only make the controllability of operation higher, can also accomplish accurate regulation, and stability and reliability among the lift process are higher, avoid adjusting seat 3 height and cause the discomfort to the disease, alleviate disease psychological burden, improve the practicality of use.

In addition, above-mentioned shifter has effectively replaced the force pump through setting up scissors fork crane 2, can enough simplify structural design, can greatly reduced manufacturing cost again, is favorable to cost control like this to improve shifter's market competition.

In an embodiment of the present invention, each set of arm support 211 includes a first arm 2111 and a second arm 2112 arranged in an X shape, and the centers of the first arm 2111 and the second arm 2112 are pivotally connected and fixed by a first pin 212, the first end of the first arm 2111 is pivotally connected and fixed with the displacement base 4 by a second pin 213, the first end of the second arm 2112 is pivotally connected and fixed with the seat 3 by a third pin 214, i.e., the first arm 2111 can rotate around the first pin 212 and the second pin 213, and the second arm 2112 can rotate around the first pin 212 and the third pin 214, so as to adjust the angle between the first arm 2111 and the second arm 2112, so as to change the vertical size of the first arm 2111 and the second arm 2112, thereby ensuring that the vertical size of the arm support 211 is adjustable.

Further, the lifting body 21 further includes a first sliding rail 215 and a second sliding rail 216, the first sliding rail 215 is fixed to the bottom of the seat 3, and the second end of the first arm 2111 is slidably connected to the seat 3 by connecting with the first sliding rail 215, so that the second end of the first arm 2111 can slide on the first sliding rail 215 when the first arm 2111 rotates around the first pin 212 and the second pin 213. The second sliding rail 216 is fixed to the displacement base 4, and the second end of the second arm 2112 is slidably connected to the displacement base 4 by being connected to the second sliding rail 216, so that when the second arm 2112 rotates around the first pin 212 and the third pin 214, the second end of the second arm 2112 can slide on the second sliding rail 216, thereby ensuring that the angle between the first arm 2111 and the second arm 2112 can be driven and adjusted.

In order to ensure that the second end of the first arm 2111 can slide against the first sliding rail 215, the first sliding rail 215 is disposed in the plane where the arm support 211 is located, and is preferably disposed along the horizontal direction, so that the first sliding rail 215 can be tightly attached to the bottom surface of the seat 3, the rationality of the structural design is improved, the stability and reliability of the first sliding rail 215 can be effectively ensured, and the stress capacity of the first sliding rail 215 is improved.

In order to ensure that the second end of the second arm 2112 can lean against the second sliding rail 216 to slide, the second sliding rail 216 should be arranged in the plane where the arm support 211 is located, and the second sliding rail 216 is preferably arranged along the horizontal direction, so that the second sliding rail 216 can be attached to the upper surface of the displacement base 4, the rationality of the structural design can be improved, the stability and the reliability of the second sliding rail 216 can be effectively ensured, and the stress capacity of the second sliding rail 216 is improved.

The transmission assembly 11 of the present embodiment includes a screw 111 and a nut, wherein the nut is fixedly connected to the second arm 2112, so that the second end of the second arm 2112 can be slid by driving the nut to move, and the angle between the first arm 2111 and the second arm 2112 can be adjusted.

Specifically, the above-described screw 111 is rotatably fixed to the shifting base 4, the seat 3, or the first arm 2111, and is screw-engaged with the nut, whereby when the rotatable member 12 drives the screw 111 to rotate, the relative position of the nut and the screw 111 can be driven and adjusted, thereby adjusting the angle between the first arm 2111 and the second arm 2112 to achieve height adjustment of the seat 3. Since the second end of the second arm 2112 is slidably connected to the shift base 4 via the second slide rail 216, it is preferable to connect a nut to the second end of the second arm 2112, which is beneficial to driving the second arm 2112 to rotate around the first pin 212 and the third pin 214, and reduces the torque, thereby reducing the driving difficulty of the rotatable member 12 and the transmission assembly 11, reducing the labor intensity of the operation, and improving the convenience of the operation.

Since the second end of the second arm 2112 is slidably connected to the displacement base 4 via the second slide rail 216, the screw 111 is preferably rotatably fixed to the displacement base 4 in order to horizontally arrange the transmission assembly 11. Of course, in practical application, the fixing mode of the nut and the screw 111 can be determined according to practical situations; for example, a nut may also be fixedly connected to the first arm 2111, the screw 111 may be rotatably fixed to the displacement base 4, and the screw 111 may be threadedly engaged with the nut.

In order to ensure that the screw 111 can be reliably and fixedly connected with the shifting base 4, the seat 3 or the second arm 2112 in a rotatable manner, a pivot hole may be provided in the shifting base 4, the seat 3 or the second arm 2112, and an annular groove adapted to the pivot hole is provided on an outer wall of the screw 111, so that the screw 111 can be rotatably connected with the shifting base 4, the seat 3 or the second arm 2112 by means of the annular groove and the pivot hole, that is, two side walls of the annular groove are respectively limited to two end openings of the pivot hole, thereby preventing the screw 111 from sliding axially along the pivot hole. Specifically, the side wall of the pivot hole may be provided with an assembly passage communicating with the outside, whereby the screw 111 may be fitted into the pivot hole through the assembly passage, and the annular groove is engaged with the pivot hole to ensure reliable installation of the screw 111. And, assemble to the assembly passageway by the assembly part in order to shutoff assembly passageway to can fix the screw rod 111 spacing in the pin joint hole, accomplish the assembly operation of screw rod 111.

Preferably, the displacement base 4 of the present embodiment is provided with a first bushing 41 fitted with the screw 111, and the screw 111 is rotatably fixed to the displacement base 4 by fitting with the first bushing 41. In addition, the outer wall of the screw 111 is further sleeved with a second bushing and a fixed limit ring, wherein the second bushing is located between the first bushing 41 and the rotatable member 12, thereby limiting the distance between the rotatable member 12 and the first bushing 41. The limiting rings are located on the side of the first shaft sleeve 41 opposite to the second shaft sleeve, that is, the second shaft sleeve and the limiting rings are respectively limited to two ends of the first shaft sleeve 41, so that the screw 111 can be prevented from moving relative to the second shaft sleeve.

In another embodiment of the present invention, the transmission assembly 11 comprises a nut fixed to the displacement base 4, a screw 111 adapted to the nut, the rotatable member 12 is fixedly connected to the screw 111, and the screw 111 is in threaded engagement with the nut, so that when the rotatable member 12 is driven, the nut is not in the same position and the screw 111 moves relative to the nut.

Furthermore, the end of the screw 111 (specifically, the end away from the rotatable member 12) is rotatably fixed to the first arm 2111 or the second arm 2112, so that the screw 111 does not rotate the first arm 2111 and the second arm 2112, and the screw 111 moves relative to the nut when rotating, thereby moving the first arm 2111 and the second arm 2112, and further adjusting the angle between the first arm 2111 and the second arm 2112. The end of the screw 111 is preferably fixedly connected to the second ends of the first arm 2111 and the second arm 2112, so that the moment can be effectively reduced, and the difficulty of driving operation can be reduced.

In an embodiment of the utility model, above-mentioned scissor type crane 2 includes drive connecting rod and two sets of lift main part 21, two sets of lift main part 21 correspond the both sides to seat 3, and the both ends of drive connecting rod meet with the second end of the second armed lever 2112 of two sets of lift main part 21 respectively, realize the linkage of the second armed lever 2112 of two sets of lift main part 21, drive two sets of lift main part 21 simultaneously when drive connecting rod does not drive promptly, with the angle of the cantilever crane 211 of two sets of lift main part 21 of synchronous adjustment, realize seat 3's altitude mixture control. Above-mentioned shifter is through setting up two sets of lift main part 21 to make two sets of lift main part 21 correspond the both sides to seat 3, can effectively improve the structural strength who cuts fork crane 2, make the rising decline of seat 3 more reliable and stable, prevent that structural strength is not enough to shake easily.

Further, the transmission assembly 11 is fixedly connected to the driving connecting rod, so that the driving connecting rod is driven to drive the second ends of the second arm bars 2112 of the two sets of lifting bodies 21 to move synchronously, thereby adjusting the angles of the arm frames 211 of the two sets of lifting bodies 21. Certainly, in practical application, the number of the lifting main bodies 21 of the scissor type lifting frame 2 can be specifically determined according to practical situations; for example, the scissor lift 2 includes three sets of lift bodies 21 and driving links, and the driving links are fixedly connected to second ends of the second arms 2112 of the three sets of lift bodies 21, respectively.

In particular, the first and second sliding

rails

215 and 216 are preferably arranged in a horizontal direction, which may improve the installation stability of the first and second sliding

rails

215 and 216. Also, the first arm 2111 includes a first slider 217 pivotally mounted to the second end, so that the first arm 2111 can slide along the first slide rail 215 via the first slider 217. In addition, the second arm 2112 includes a second slider 218 that is pivotally mounted to the second end such that the second arm 2112 slides along the second slide 216 via the second slider 218. Above-mentioned simple structure is practical, has both avoided the structure to complicate, can effectively guarantee the joint strength between first armed lever 2111 and first slide rail 215 and second armed lever 2112 and second slide rail 216 again, prevents that the atress from breaking away from.

In order to improve the structural strength of the scissor type lifting frame 2, the first arm bars 2111 of the two groups of lifting main bodies 21 can be positioned at the inner side, and a plurality of reinforcing connecting rods are connected between the first arm bars 2111 of the two groups of lifting main bodies 21, so that the horizontal stress capacity of the two groups of lifting main bodies 21 can be effectively improved, the impact force in the horizontal direction is avoided, the deformation and the damage are easy to occur, and the stability of the whole structure is improved.

In another embodiment of the present invention, the screw 111 and the nut are both disposed along a horizontal direction and parallel to the direction of the lifting body 21. And, the outer wall of the screw 111 is provided with an external thread arranged along the length direction of the screw 111, the external thread is matched with the internal thread of the nut, and the screw 111 is in transmission connection with the nut by means of matching the external thread with the internal thread, so that when the rotatable member 12 drives the screw 111 to rotate, the nut can move relative to the screw 111 along the length direction of the screw 111, or the screw 111 can move relative to the nut along the axial direction of the nut.

In addition, the end of the screw 111 is provided with a limiting part, which can prevent the screw 111 from disengaging from the nut to cause the failure of the fit connection between the screw 111 and the nut.

In particular, the outer wall of the nut is provided with a locking groove communicating with the internal thread. The above-mentioned transmission assembly 11 includes a locking block detachably mounted to the locking groove, a locking elastic pad made of an elastic material (e.g., rubber, high-strength rubber, etc.) is provided on a surface of the locking block, and the locking elastic pad presses the external thread of the screw 111 when the locking block is mounted to the locking groove, so that the external thread can be prevented from rotating relative to the internal thread, thus effectively improving the load-bearing capacity of the displacement device.

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 should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A shifting device is used for transferring patients in different indoor scenes and is characterized by comprising a driving device, a scissor type lifting frame, a seat and a shifting base, wherein the seat and the shifting base are respectively and fixedly connected to two ends of the scissor type lifting frame; the driving device comprises a transmission assembly and a rotatable member fixedly connected with the transmission assembly, and the transmission assembly is driven by the rotatable member to adjust the angle of the arm support, so that the height of the seat relative to the shifting base is adjusted.

2. The shifting device according to claim 1, wherein each group of the arm supports comprises a first arm lever and a second arm lever which are arranged in an X shape, the centers of the first arm lever and the second arm lever are pivotally connected and fixed through a first pin shaft, the first end of the first arm lever is pivotally connected and fixed with the shifting base through a second pin shaft, and the first end of the second arm lever is pivotally connected and fixed with the seat through a third pin shaft;

3. The displacement apparatus of claim 2, wherein the transmission assembly includes a nut fixed to the second arm, a threaded rod adapted to the nut, and the rotatable member is fixedly connected to the threaded rod;

4. The displacement device according to claim 3, wherein the displacement base, the seat or the second arm is provided with a pivot hole, the outer wall of the screw is provided with an annular groove matched with the pivot hole, and the outer wall of the screw is rotatably connected with the displacement base, the seat or the second arm in a manner that the annular groove is matched with the pivot hole.

5. The displacement apparatus of claim 2, wherein the transmission assembly comprises a nut fixed to the seat or displacement base, a screw fitting to the nut, and the rotatable member is fixedly connected to the screw;

6. The shifter according to claim 2, wherein the scissor-type lifting frame comprises two sets of lifting bodies corresponding to two sides of the seat and driving connecting rods fixedly connected with the second ends of the second arms of the two sets of lifting bodies respectively, and the transmission assembly is fixedly connected with the driving connecting rods and drives the driving connecting rods to drive the second ends of the second arms of the two lifting bodies to move synchronously so as to adjust the angles of the arms of the two sets of lifting bodies.

7. The displacement device according to claim 2, wherein the first slide rail and the second slide rail are arranged in a horizontal direction, and the first arm comprises a first slide block mounted to the second end through a pin shaft, and the first slide block is matched with the first slide rail to slide; the second arm rod comprises a second sliding block which is arranged at the second end through a pin shaft, and the second sliding block and the second sliding rail are matched to slide.

8. Displacement device according to claim 6, characterised in that the first arms of the two said bodies are located inside and between the first arms of the two said bodies there are connected several reinforcing connecting rods.

9. The displacement device according to claim 3, wherein the screw and the nut are both disposed in a horizontal direction and parallel to a disposition direction of the lifting body;

10. The displacement device according to claim 3, wherein the displacement base is provided with a first bushing adapted to the threaded rod, the threaded rod being rotatably fixed to the displacement base by cooperation with the first bushing;