JP2004238097A - Lift device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lift device capable of conducting mounting of any object to be elevated and lowered onto an elevating/lowering table without obstruction and setting low the lowermost sunk position of the table. <P>SOLUTION: The lift device 10 is structured so that the elevating/lowering table 11 whereon the object is placed elevates and lowers in the vertical direction relative to a base 15 through the motion of scissor links 12 and 13. The scissor links 12 and 13 are installed on link supports 19 on both sides of the table 11, and an elevating/lowering mechanism 14 to operate the scissor links 12 and 13 is installed on the base 15 in such a positioning as mating with the link supports 19 of the table 11. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lift device that lifts and lowers an object to be raised or lowered, such as a wheelchair, a person (particularly, a person with a lower limb disability), and a load.
[0002]
[Prior art]
If a person with a lower limb disability is in a wheelchair and wants to get over a step that exists at the entrance of a building, for example, or when getting on or off a vehicle, install it in a place with a step and move the wheelchair up and down. 2. Description of the Related Art Conventionally, a lifting device has been proposed (see, for example, Patent Documents 1 and 2).
[0003]
In addition, a lift device is also known in which a lower limb disabled person who is not in a wheelchair climbs up and down by directly mounting the lower limb disabled person even when climbing over the step.
Further, in loading and unloading work, a lift device for raising and lowering the load is also used when stacking the load at a predetermined place.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-59774 [Patent Document 2]
JP-A-2001-58796 [0005]
[Problems to be solved by the invention]
However, in the lift device described in Patent Literature 1, since the elevation of the elevating table on which the wheelchair is mounted is vertically guided by the guide posts, when the person with lower limb disability uses the wheelchair or directly gets on the elevating table , The guide post becomes an obstacle. Even when such a lift device is used for cargo handling work, the guide post becomes a hindrance to the work of loading and unloading cargo on the elevating table.
[0006]
Further, in the lift device described in Patent Literature 2, the vertical movement of the lifting table in the vertical direction is performed by a lifting means (a screw shaft, a nut portion) and a drive motor for operating the scissor link via the scissor link. The lifting means and the driving motor are installed below the center position of the lifting table. For this reason, these elevating means and the like hinder, and the lowest position of the elevating table cannot be set to a low position close to the ground or the floor.
[0007]
An object of the present invention has been made in consideration of the above-described circumstances, and provides a lift device that can mount an object to be lifted and lowered on a lifting table without hindrance and can set a lowermost position of the lifting table low. It is in.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a lift device in which an elevating table on which an object to be elevated can be placed is vertically moved with respect to a base by operation of a scissors link, wherein the scissors link is provided on both sides of the elevating table. The lifting means for operating the scissors link is disposed at a position corresponding to the side of the lifting table.
[0009]
According to a second aspect of the present invention, in the first aspect of the present invention, the elevating means includes a pair of screw shafts and a nut portion screwed to each other, and the screw shaft is provided on a base. The nut is connected to a synchronous shaft and rotated synchronously by the synchronous shaft, and the nut portion is supported by the scissor link.
[0010]
According to a third aspect of the present invention, in the second aspect of the present invention, the screw shaft is disposed in a horizontal state at the same height as the synchronous shaft and the fixed-side fulcrum of the scissors link to the base. It is a feature.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[A] First Embodiment (FIGS. 1 to 10)
FIG. 1 is a perspective view showing a first embodiment of a lift device according to the present invention. FIG. 2 is a side view showing a main unit in the lift device of FIG.
[0012]
The lift device 10 shown in FIGS. 1 and 2 raises and lowers an object to be lifted (particularly a lower limb disabled person) such as a wheelchair, a lower limb disabled person, and luggage. It is possible to get over an existing step or a step existing when getting on or off a vehicle, or to move a load to a predetermined height.
[0013]
The lift device 10 includes an elevating table 11 for placing an object to be elevated (not shown), two scissor links 12 and 13 for elevating the elevating table 11 with respect to a base 15 in a vertical direction, and a driving force of a driving motor 24. The main unit 40 includes an elevating mechanism 14 as an elevating means for elevating the elevating table 11 as described above, and the base 15 on which the scissor links 12, 13 and the elevating mechanism 14 are installed. Further, the lift device 10 has a drive unit 41 provided with the drive motor 24, and a control unit 42 (FIG. 7) for controlling the forward start, reverse start and stop of the drive motor 24.
[0014]
As shown in FIG. 8, the base 15 of the main unit 40 has a rectangular frame shape, and supports the scissor links 12 and 13 and a later-described synchronous shaft 31, a rising end limit switch 43, and a falling end limit switch 44. Among them, the rising end limit switch 43 and the falling end limit switch 44 are attached to the base 15 via the sensor rail 45 as shown in FIG.
[0015]
As shown in FIGS. 1 and 4, the elevating table 11 has a link supporting portion 19 integrated on both sides of a mounting surface portion 18 on which an object to be lifted can be mounted. It has a monocoque structure as shown in FIG.
[0016]
The mounting surface portion 18 is provided at a position lower than the link support portion 19 by a height difference H, and a plurality of reinforcing ribs 16 are mainly fixed to the back surface of the mounting surface portion 18 to reduce the rigidity of the lifting table 11. Secured. The lifting table 11 is vertically movable above the base 15 by the action of the scissors links 12 and 13 and the lifting mechanism 14 shown in FIGS.
[0017]
The scissors links 12 and 13 are arranged between each of the link support portions 19 on both sides of the mounting surface 18 of the lifting table 11 and the base 15. Each of these scissors links 12 and 13 has an inner link arm 21 and an outer link arm 22 pivotally supported by a link hinge bolt 23 at a central position in the longitudinal direction. The respective inner link arms 21 of the scissors links 12 and 13 are connected by a link stay 20 to be integrated.
[0018]
As shown in FIGS. 4 and 5, the inner link arm 21 has a lower end 21B pivotally supported by a hinge bracket 33 fixed to the base 15 via a hinge pin 49, and an upper end 21A formed of a roller 34. And is slidably disposed on the link support 19 of the elevating table 11 by using. The outer link arm 22 has an upper end 22A pivotally supported via a hinge pin 50 on a hinge bracket 35 fixed to the link support 19 of the elevating table 11, and a lower end 22B using a roller 36. It is slidably disposed on the base 15.
[0019]
The upper end 21A of the inner link arm 21 slides on the link support 19 of the lifting table 11 using the roller 34, and the lower end 22B of the outer link arm 22 slides on the base 15 using the roller 36. As a result, the scissors links 12 and 13 move the elevating table 11 vertically with respect to the base 15 as shown by the two-dot chain line in FIG.
[0020]
As shown in FIGS. 4 and 5, the roller 34 is rotatably supported by the upper end 21 </ b> A of the inner link arm 21 via a support bolt 37, and the roller presser of the link support 19 of the lifting table 11 is supported. And rolls between them. As shown in FIGS. 2 and 4, the roller presser 38 extends in the rolling direction of the roller 34 and is attached to the link support 19 using a plate nut 39 fixed to the link support 19. In addition, due to the presence of the roller presser 38, even if the lifting table 11 receives the moment F in the direction of rotation about the upper end portion 22A of the outer link arm 22, the roller 34 comes into contact with the roller presser 38, and Bouncing around the upper end 22A is prevented.
[0021]
The decorative cover 46 is screwed to both link support portions 19 of the lifting table 11 using the plate nut 39. With the decorative cover 46, the scissors links 12, 13 and the elevating mechanism 14 and the like are not visible from the outside when the elevating table 11 is at the lowest position.
[0022]
The roller 36 is rotatably supported by a nut shaft 47 as shown in FIGS. The nut shaft 47 extends from nut portions 27 and 28 described later, and penetrates the lower end portion 22B of the outer link arm 22. The roller 36 rolls between the base 15 and the roller presser 48. The roller presser 48 also extends in the rolling direction of the roller 36 and is fixed to the base 15. Further, the roller presser 48 abuts against the roller 36 to ensure a parallel state of the base 15 with respect to the elevating table 11.
[0023]
3 and 4, the lifting mechanism 14 includes screw shafts 25 and 26 and nut portions 27 and 28. The screw shaft 25 has a nut portion 27, and the screw shaft 26 has a nut portion 28. Are screwed respectively. The screw shaft 25 and the nut portion 27 are arranged on the side of the scissors link 12 at a position corresponding to one link support portion 19 of the lifting table 11. Further, the screw shaft 26 and the nut portion 28 are disposed at positions corresponding to the other link support portion 19 of the lifting table 11 on the side of the caesars link 13.
[0024]
As described above, the nut portions 27 and 28 are integrally formed with the nut shaft 47 that penetrates the lower end portion 22B of the outer link arm 22 of each of the scissor links 12 and 13 and supports the roller 36.
[0025]
Each of the screw shafts 25 and 26 is connected to the synchronous shaft 31 via bevel gears 30A and 30B that mesh with each other. Both ends of the synchronous shaft 31 are rotatably supported by the base 15 via a bearing stand 32, and the bevel gear 30B is rotatably coupled to one end and the other end of the synchronous shaft 31. The bevel gear 30A is rotatably coupled to one end of each of the screw shafts 25 and 26.
[0026]
These screw shafts 25 and 26 are disposed in a horizontal state, and the other end on the side where the nut portions 27 and 28 are screwed is supported by a fitting hole 29 of the base 15 so as to be freely rotatable (rotable). The one end to which the bevel gear 30 </ b> A is coupled is supported by a bearing block 51 so as to be freely rotatable (rotable). The bearing block 51 is provided integrally with the hinge pin 49 that supports the lower end 21B of the inner link arm 21 of the Caesars links 12, 13. Therefore, the bearing block 51 is supported on the base 15 by the hinge bracket 33 via the hinge pin 49.
[0027]
Further, as shown in FIG. 5, the screw shafts 25 and 26 are disposed in a horizontal arrangement state, and the synchronous shaft 31 and the hinge pins 49 (that is, the fixing of the inner link arms 21 of the dither links 12 and 13 to the base 15). Side fulcrum). The nut portions 27 and 28 screwed to the screw shafts 25 and 26 are also set at the same height as the synchronous shaft 31 and the hinge pin 49. Therefore, even when the Caesar's links 12 and 13 operate via the nut portions 27 and 28 due to the rotation (rotation) of the screw shafts 25 and 26, the screw shafts 25 and 26 move up and down with the operation of the scissors links 12 and 13. The bevel gear 30A of the screw shafts 25 and 26 and the meshing of the bevel gear 30B of the synchronous shaft 31 are favorably secured without being held in place.
[0028]
As shown in FIG. 3, an input nut 52 is rotatably coupled to one end of the synchronous shaft 31. The input nut 52 is rotatably integrated with the output socket 53 of the drive unit 41 shown in FIGS. The drive unit 41 includes the drive motor 24 and the speed reduction mechanism 54 connected to each other, and the output socket 53 is connected to the speed reduction mechanism 54. The drive motor 24 is, for example, an AC motor that can rotate forward or reverse.
[0029]
Therefore, when the drive motor 24 of the drive unit 41 is started while the output socket 53 of the drive unit 41 is fitted to the input socket 52 of the synchronous shaft 31 of the main unit 40, the driving force of the drive motor 24 is Is transmitted to the synchronous shaft 31 via the output socket 53, and the synchronous shaft 31 is rotationally driven. By the rotation of the synchronous shaft 31, the screw shafts 25 and 26 of the elevating mechanism 14 are synchronously rotated via the bevel gears 30B and 30A, and the nut portion 27 extends along the axial direction of the screw shaft 25 and the nut portion. 28 relatively move by the same amount along the axial direction of the screw shaft 26, respectively. As a result, the inner link arm 21 and the outer link arm 22 of the scissors links 12 and 13 operate using the link hinge bolt 23 as a pivot point, and the elevating table 11 moves vertically above the base 15 while being secured in a horizontal state. Go up and down.
[0030]
As shown in FIG. 7, the drive unit 45 and the control unit 42 are electrically connected using a connection cable 55, and a power cable 56 is connected to the control unit 42. Power is supplied to the drive motor 24 of the drive unit 41 via the power cable 56, the control unit 42, and the connection cable 55. The control unit 42 is provided with an up operation button 57 and a down operation button 58. By the respective pressing operations of the ascending operation button 57 and the descending operation button 58, the driving motor 24 of the driving unit 41 is started to rotate forward and to rotate backward, and the elevating table 11 is moved up and down, respectively.
[0031]
Further, the control unit 42 is electrically connected to the rising end limit switch 43 and the falling end limit switch 44 using a signal cable 59. As shown in FIGS. 3 and 6, the ascending-end limit switch 43 and the descending-end limit switch 44 can come into contact with a dock 60 attached to the nut portion 27 of the elevating mechanism 14 that operates the scissors link 12. . When the dock 60 comes into contact with the rising end limit switch 43, it is detected by the rising end limit switch 43 that the lifting table 11 has reached the highest end, and the control unit 42 stops the forward rotation of the drive motor 24. . When the dock 60 contacts the lower limit switch 44, the lower limit switch 44 detects that the lifting table 11 has reached the lowermost end, and the control unit 42 stops the reverse rotation of the drive motor 24. .
[0032]
As described above, in the lift device 10, the main unit 40, the drive unit 41, and the control unit 42 are configured separately, and the drive unit 41 and the control unit 42 are connected by the connection cable 55, and the drive unit 41 is connected to the main unit. The unit 40 is provided detachably. When the main unit 40 and the drive unit 41 are mounted, the output socket 53 of the drive unit 41 is fitted to the input nut 52 of the synchronous shaft 31 of the main unit 40 and serves as a reaction force receiving means of the drive unit 41. Is inserted into the insertion hole 62 of the main unit 40.
[0033]
The reaction force receiving pins 61 are provided on both sides of the output socket 53 in the drive unit 41, and the insertion holes 62 are formed on the connection plate 63 fixed to the base 15 of the main unit 40 and on the reaction force receiving pins 61. It is formed correspondingly. With the reaction force receiving pin 61 inserted into the insertion hole 62 in the connection plate 63 of the base 15, the driving of the drive motor 24 in the main unit 41 is performed via the speed reduction mechanism 54, the synchronous shaft 31, and the elevating mechanism 14, and the Cathez links 12 and 23 When the elevating table 11 is raised and lowered, the torque reaction force acting on the output socket 53 of the drive unit 41 from the elevating table 11 via the scissors links 12 and 13, the elevating mechanism 14 and the synchronous shaft 31 is as described above. It is supported by the connection plate 63 of the base 15 via the reaction force receiving pin 61.
[0034]
With the configuration described above, according to the above embodiment, the following effects (1) to (5) can be obtained.
{Circle around (1)} Since the lifting table 11 is lifted and lowered in the vertical direction with respect to the base 15 by using the scissors links 12 and 13 instead of the guide posts, the work of loading / unloading the luggage to the lifting table 11 or using a wheelchair or a wheelchair. The operation of the person with lower limb disability who does not use the limb on the elevator table 11 does not hinder the guide post.
[0035]
{Circle around (2)} The scissor links 12 and 13 are arranged on the link support portions 19 on both sides of the mounting surface portion 18 of the elevating table 11, and the screw shaft 25 and the nut portion 27 as the elevating mechanism 14 and the screw shaft 26 and the nut portion 28 are respectively provided. Since the scissors links 12, 13 are arranged on both sides of the placing surface 18 in the vicinity of the scissors links 12, the scissors links 12, 13 and the elevating mechanism 14 are not arranged at a central position below the placing surface 18. For this reason, the mounting surface portion 18 of the lifting table 11 can be flattened, and the lowest position of the lifting table 11 can be set to an extremely low position close to the ground or the floor. As a result of the lowest position of the elevating table 11 being extremely low, the lower limb disabled person using a wheelchair or not using a wheelchair can easily get on and off the elevating table 11 and can load and unload luggage on the elevating table 11.
[0036]
{Circle over (3)} The screw shafts 25 and 26 arranged on the base 15 corresponding to both sides of the mounting surface portion 18 of the lifting table 11 are configured to be synchronously rotatable by the same drive motor 24 using the synchronous shaft 31. Therefore, the relative movement amounts of the nut portions 27 and 28 screwed to the screw shafts 25 and 26 with respect to the screw shafts 25 and 26 in the axial direction are substantially the same. As a result, the operations of the scissors links 12 and 13 are also performed in synchronization with each other, so that the elevation table 11 does not tilt, and the elevation table 11 can be favorably moved up and down while maintaining a horizontal state. .
[0037]
{Circle around (4)} The screw shafts 25 and 26 of the elevating mechanism 14 are horizontally disposed on the base 15, and the screw shafts 25 and 26 are connected to the synchronous shaft 31 and the inner link arms 21 of the scissors links 12 and 13. 15 is fixed to the same height as the hinge pin 49 that is pivotally supported, so that even when the scissors links 12 and 13 operate via the nut portions 27 and 28 due to the rotation of the screw shafts 25 and 26, The screw shafts 25 and 26 do not move up and down with the operation of the links 12 and 13, and the screw shafts 25 and 26 can be held at fixed positions. For this reason, the meshing of the bevel gears 30A of the screw shafts 25 and 26 and the bevel gear 30B of the synchronous shaft 31 can be ensured well.
[0038]
{Circle over (5)} The main unit 40 including the lifting table 11, the scissors links 12, 13, the lifting mechanism 14, and the base 15, and the driving unit 41 including the driving motor 24 are separately formed, and the output socket of the driving unit 41 is provided. 53 is detachably fitted to the input socket 52 of the synchronization shaft 31 of the main unit 40, and the drive unit 41 is configured to be detachable from the main unit 40, so that the main unit 40 and the drive unit 41 are separated. be able to. Since the drive unit 41 includes the heavy drive motor 24, the main unit 40 and the drive unit 41 can be separated and transported to a predetermined location, and transport of the lift device 10 can be facilitated.
[0039]
[B] Second Embodiment (FIG. 11)
FIG. 11 is a perspective view showing a second embodiment of the lift device according to the present invention. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0040]
The difference between the lift device 70 of the second embodiment and the lift device 10 of the first embodiment is that the main unit 71 and the drive unit 72 are connected by a flexible shaft 73, and That is, a speed reduction mechanism 74 is provided. In this case, the drive unit 72 may include a speed reduction mechanism. In FIG. 11, the control unit 42 connected to the drive unit 72 is not shown.
[0041]
The flexible shaft 73 is provided so as to be flexibly deformable, and one end thereof is rotatably coupled to the output socket 53 of the drive unit 72. To the other end of the flexible shaft 73, a driving pulley 75 is integrally connected to rotate. A timing belt 77 is wound around the driving pulley 75 and the driven pulley 76 to constitute the speed reduction mechanism 74. The driven pulley 76 is rotatably coupled to one end of the synchronous shaft 31 of the main unit 71.
[0042]
The driving force from the drive motor 24 in the drive unit 72 is transmitted to the main unit 71 via the output socket 53 and the flexible shaft 73 (after passing through the speed reduction mechanism if the drive unit 72 has a speed reduction mechanism). The speed is transmitted to the speed reduction mechanism 74 and decelerated, the synchronous shaft 31 is rotated, the lifting mechanism 14 is driven, the scissors links 12 and 13 are operated, and the lifting table 11 is raised and lowered.
[0043]
At the bottom of the drive unit 72, reaction force receiving arms 78 as reaction force receiving means are mounted on both sides of the output socket 53 so as to be stowable. The pair of reaction force receiving arms 78 act on the output socket 53 of the drive unit 72 from the lifting table 11 of the main unit 71 via the scissors links 12 and 13, the lifting mechanism 14, the synchronous shaft 31, the reduction mechanism 74 and the flexible shaft 73. To support the torque reaction force.
[0044]
Therefore, also in the lift device 70 according to the second embodiment, in addition to the effects (1) to (4) of the lift device 10, the following effects (6) and (7) are obtained.
{Circle around (6)} Since the driving force of the drive motor 24 in the drive unit 72 is transmitted to the synchronous shaft 31 of the main unit 71 using the flexible shaft 73 that can be deformed, the drive unit 72 is different from the main unit 71. Since the main unit 71 and the drive unit 72 can be installed at a place, the degree of freedom in the layout of the main unit 71 and the drive unit 72 can be improved.
[0045]
{Circle around (7)} When the flexible shaft 73 is configured to be detachable from the output socket 53 of the drive unit 72 or the synchronous shaft 31 of the main unit 71, the main unit 71 and the drive unit 72 are detachable. Therefore, the transportability of the lift device 70 can be improved by separately transporting the main unit 71 and the drive unit 72.
[0046]
[C] Third Embodiment (FIG. 12)
FIG. 12 is a perspective view showing a chair to which the third embodiment of the lift device according to the present invention is applied. In the third embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.
[0047]
The chair 80 according to the third embodiment is different from the lift device 70 according to the second embodiment in that the lifting table 11 of the main body unit 71 is used as a seat surface portion 81, and a back support portion 82 is provided on the seat surface portion 81. It is a thing. In FIG. 12, the control unit 42 is not shown.
[0048]
The chair 80 has the same effect as the lift device 70 of the second embodiment, and furthermore, the degree of freedom in the layout of the main unit 71 and the drive unit 72 is increased. In this case, the space can be effectively used.
[0049]
As described above, the present invention has been described based on the above embodiment, but the present invention is not limited to this.
For example, a stepping motor or a servomotor is adopted as the drive motor 24, a stop position of the lift table 11 is set in advance based on the rotation angle of the motor, and the control unit 42 controls the motor to stop the lift table 11 at the stop position. May be program-controlled. When the main unit 40 and the drive unit 41 are detachable, a sensor for detecting the position of the elevating table 11 of the main unit 40 when, for example, the lowermost position is set in the drive unit 41 is installed in the drive unit 41. The motor rotation angle (the number of motor drive pulses in the case of a stepping motor) when the sensor detects, for example, the lowest position of the elevating table 11 is set as an initial value. The control unit 42 controls the motor based on the angle.
[0050]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the lift apparatus which concerns on this invention, while mounting an object to be lifted on a lifting table can be implemented without trouble, the lowest position of a lifting table can be set low.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of a lift device according to the present invention.
FIG. 2 is a side view showing a main unit in the lift device of FIG. 1;
FIG. 3 is a sectional view taken along the line III-III in FIG. 2;
FIG. 4 is a view taken in the direction of the arrow IV in FIG. 2;
5 is a sectional view taken along the line VV in FIG.
FIG. 6 is a sectional view taken along the line VI-VI in FIG. 3;
FIG. 7 is a plan view showing a driving unit and a control unit of FIG. 1;
FIG. 8 is a plan view showing the base of FIG. 1;
9A and 9B show the elevation table of FIG. 1, wherein FIG. 9A is a plan view and FIG. 9B is a side view.
10A and 10B show the elevation table of FIG. 1, wherein FIG. 10A is a front view, and FIG. 10B is a cross-sectional view taken along line XX of FIG. 9A.
FIG. 11 is a perspective view showing a second embodiment of the lift device according to the present invention.
FIG. 12 is a perspective view showing a chair to which a third embodiment of the lift device according to the present invention is applied.
[Explanation of symbols]
Reference Signs List 10 Lifting device 11 Lifting table 12, 13 Scissors link 14 Lifting mechanism 15 Base 18 Mounting surface 19 Link support 24 Drive motor 25, 26 Screw shaft 27, 28 Nut 31 Synchronous shaft 49 Main unit 41 Drive unit 42 Control unit 52 Input nut 53 Output socket 61 Reaction force receiving pin (reaction force receiving means)
62 Insertion hole 70 Lift device 71 Main unit 72 Drive unit 73 Flexible shaft 74 Reduction mechanism 78 Reaction force receiving arm (reaction force receiving means)
80 seat chair

Claims (3)

An elevating table on which an object to be lifted can be placed is a lift device that moves up and down in a vertical direction with respect to a base by operation of a scissors link,
The scissors links are arranged on both sides of the lifting table, respectively.
A lifting device, wherein the lifting means for operating the scissors link is arranged at a position corresponding to the side portion of the lifting table. The elevating means includes a pair of screw shafts and a nut portion that are screwed together,
The lift device according to claim 1, wherein the screw shaft is connected to a synchronous shaft provided on a base, and is rotated synchronously by the synchronous shaft, and the nut portion is supported by the scissors link. . The lift device according to claim 2, wherein the screw shaft is disposed at the same height as a synchronous shaft and a fulcrum on a fixed side of the scissors link to the base, and is horizontally arranged.

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