Load receiving platform lifting device and vehicle

Abstract

To provide a load receiving platform lifting device capable of moving a moving unit in an emergency.SOLUTION: A load receiving platform lifting device includes: a support column that extends in the vertical direction; a slider that is arranged so as to extend over the inside and the outside of the support column and moves in the vertical direction relative to the support column; a load receiving platform that is connected to the slider; a rope that is connected to the slider; a cylinder that is extendable and retractable in the axial direction; and a moving unit that has a movable sheave over which the rope is wound, and moves in the axial direction of the slider in order to move the slider in the vertical direction. The cylinder includes: a cylinder body; and a cylinder rod that moves in the axial direction of the cylinder relative to the cylinder body in order to move the moving unit in the axial direction of the cylinder. The moving unit includes a female threaded part whose axial direction is in parallel to the axial direction of the cylinder and is screwed to a male threaded material in an emergency.SELECTED DRAWING: Figure 19

Description

Technical Field

[0001] This specification relates to a load receiving platform lifting device and a vehicle.

Background Art

[0002] Conventionally, for example, a load receiving platform lifting device includes a column extending in the vertical direction, a slider disposed across the inside and outside of the column and moving vertically with respect to the column, a load receiving platform connected to the slider, a rope connected to the slider, a cylinder having a cylinder body and a cylinder rod, and a moving unit having a moving sheave around which the rope is wound (for example, Patent Document 1).

[0003] And since the moving unit is connected to the cylinder rod, when the cylinder rod moves with respect to the cylinder body, the slider and the load receiving platform move in the vertical direction. By the way, for example, in an emergency such as when the device fails, there is a desire to move the moving unit.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, the problem is to provide a load receiving platform lifting device and a vehicle capable of moving the moving unit in an emergency.

Means for Solving the Problems

[0006] The load receiving platform lifting device includes a column extending in the vertical direction, a slider disposed across the inside and outside of the column and moving vertically with respect to the column, a load receiving platform connected to the slider, a rope connected to the slider, a cylinder that can expand and contract in the axial direction, having a moving sheave around which the rope is wound, and a moving unit that moves in the axial direction of the cylinder to move the slider in the vertical direction, The cylinder, a cylinder body, and a cylinder rod that moves in the axial direction of the cylinder with respect to the cylinder body to move the moving unit in the axial direction of the cylinder, The moving unit includes a female screw portion whose axial direction is parallel to the axial direction of the cylinder and that is screwed onto a male screw member in an emergency.

[0007] The vehicle, the above-described load-carrying platform lifting device, and a load-carrying platform to which the load-carrying platform lifting device is attached.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Figure 23

Mode for Carrying Out the Invention

[0009] In each drawing, for example, for ease of understanding, the dimensions of the components may be shown enlarged or reduced with respect to the actual dimensions, and the dimensional ratios between the drawings may not match. Note that in each drawing, for example, for ease of understanding, a part of the components may be shown omitted.

[0010] Terms including ordinal numbers such as first, second, etc. are used to describe various components, but this term is used only for the purpose of distinguishing one component from another, and the components are not particularly limited by this term. Note that the number of components including ordinal numbers is not particularly limited, and for example, there may be one. Also, the ordinal numbers used in the following specification and drawings may be different from those described in the claims.

[0011] Also, in the following description, the first direction (first lateral direction) D1 is also referred to as the front-rear direction D1. Among the first direction D1, the direction of the arrow in the figure is the front direction, and the direction opposite to the direction of the arrow in the figure is the rear direction. Also, the second direction (second lateral direction) D2 is also referred to as the left-right direction D2. Among the second direction D2, the direction of the arrow in the figure is the left direction, and the direction opposite to the direction of the arrow in the figure is the right direction.

[0012] Also, the third direction D3 is also referred to as the up-down direction D3. Among the third direction D3, the direction of the arrow in each figure is the up direction, and the direction opposite to the direction of the arrow in each figure is the down direction. That is, each of the directions D1 to D3 is the direction as seen from a person (driver) sitting in the driver's seat of the vehicle.

[0013] Hereinafter, an embodiment of a vehicle and a loading platform lifting device will be described with reference to FIGS. 1 to 21. Note that the following embodiment is exemplified to assist in understanding the configuration and the like of the vehicle and the loading platform lifting device, and does not limit the configuration of the vehicle and the loading platform lifting device.

[0014] As shown in FIG. 1, the vehicle 1 may include, for example, a vehicle body 2, a loading platform 3 fixed on a vehicle body frame 2a disposed at the rear end of the vehicle body 2, and a load receiving platform lifting device 4 attached to the loading platform 3. The vehicle 1 is not particularly limited, but may be, for example, a material handling vehicle as in this embodiment.

[0015] The loading platform 3 may include, for example, as in this embodiment, a floor portion 3a, a pair of side walls 3b, 3b respectively provided on both left and right sides of the floor portion 3a, and a shutter 3c rotatably connected to the rear end portion of the floor portion 3a about the lateral direction D2. In this embodiment, the loading platform 3 is open at the top, but is not limited to such a configuration, and may be, for example, a box-shaped (specifically, a loading box) having a ceiling and closed at the top.

[0016] The floor portion 3a includes, for example, a loading platform floor surface 3d on which goods are loaded. Thereby, the space above the loading platform floor surface 3d becomes a loading space for goods. Further, the shutter 3c may be rotatable, for example, between an open position (the position shown in FIG. 1) hanging downward from the floor portion 3a of the loading platform 3 and a closed position (not shown) rising upward from the floor portion 3a of the loading platform 3.

[0017] The load receiving platform lifting device 4 is used, for example, when loading and unloading goods from the rear of the loading platform 3 with respect to the loading platform floor surface 3d of the loading platform 3. And the load receiving platform lifting device 4 may include, for example, as in this embodiment, a vertically lifting type lifting unit 5 and a mounting unit 6 for mounting the lifting unit 5 on the loading platform 3.

[0018] The lifting unit 5 may include, for example, as in this embodiment, a pair of cylindrical columns (hereinafter, also referred to as "outer columns") 7, 7 extending in the vertical direction D3, cylindrical inner columns 8, 8 extending in the vertical direction D3, inserted into the outer columns 7, and moving in the vertical direction D3 with respect to the outer columns 7, and a cylindrical cross member 9 extending in the lateral direction D2 and connecting the pair of outer columns 7, 7.

[0019] In this embodiment, the outer column 7 has a column support slit (hereinafter also referred to as an "outer slit") 7b extending in the vertical direction D3 on the rear wall 7a, and the inner column 8 has an inner slit 8b extending in the vertical direction D3 on the rear wall 8a. The outer slit 7b and the inner slit 8b communicate with each other in the front-rear direction D1.

[0020] The lifting unit 5 may include, for example, as in this embodiment, a slider 10 that moves in the vertical direction D3 with respect to the outer column 7 and the inner column 8, and a load receiving base 11 connected to the slider 10. The slider 10 is disposed across the inside and outside of the outer column 7 and the inner column 8 by inserting through the outer slit 7b and the inner slit 8b.

[0021] Thereby, as shown in FIGS. 1 and 2, the load receiving base 11 can move in the vertical direction D3 between the lower end position (see FIG. 1) and the upper end position (see FIG. 2). At this time, the slider 10 and the load receiving base 11 move integrally with the inner column 8 in the vertical direction D3 with respect to the outer column 7, or the slider 10 and the load receiving base 11 move in the vertical direction D3 with respect to the inner column 8 and the outer column 7.

[0022] The load receiving base 11 may include, for example, as in this embodiment, a first plate 11a rotatably connected to the slider 10 and a second plate 11b rotatably connected to the first plate 11a. Thereby, as shown in FIGS. 1 to 3, the load receiving base 11 is deformable between a load receiving posture (see FIGS. 1 and 2) in which the first and second plates 11a and 11b are deployed and extend along the front-rear direction D1, and a storage posture (see FIG. 3) in which the first and second plates 11a and 11b are folded and extend along the vertical direction D3.

[0023] The attachment unit 6 may include, for example, as in the present embodiment, a base portion 12 placed on the floor portion 3a of the loading platform 3, a lock pin 13 (see FIGS. 6 and 7) for fixing the base portion 12 to the floor portion 3a of the loading platform 3, a reversing mechanism 14 for reversing the lifting unit 5 about the left-right direction D2, and a rotating mechanism 15 for rotating the lifting unit 5 and the base portion 12 about the up-down direction D3.

[0024] As shown in FIGS. 6 and 7, the lock pin 13 may fix the base portion 12 to the floor portion 3a of the loading platform 3, for example, as in the present embodiment, by sandwiching the base portion 12 and the floor portion 3a of the loading platform 3 in the up-down direction D3. And the lock pin 13 may be detachable from, for example, the base portion 12 and the floor portion 3a of the loading platform 3. Thereby, the base portion 12 can be switched between a fixed state fixed to the floor portion 3a of the loading platform 3 and a movable state movable with respect to the floor portion 3a of the loading platform 3.

[0025] Returning to FIGS. 1 to 4, the reversing mechanism 14 connects the lifting unit 5 and the base portion 12, for example, as in the present embodiment, so that the lifting unit 5 can rotate about the horizontal direction D2 with respect to the base portion 12. Thereby, as shown in FIGS. 3 and 4, the lifting unit 5 can be reversed about the left-right direction D2 between a use position (see FIGS. 1 to 3) where the load receiving platform 11 is used and a non-use position (see FIG. 4) where the load receiving platform 11 is not used.

[0026] And as shown in FIGS. 1 to 3, when the lifting unit 5 is in the use position, a part of the outer column 7 is disposed below the loading platform floor surface 3d. On the contrary, as shown in FIG. 4, when the lifting unit 5 is in the non-use position, the entire outer column 7 is disposed above the loading platform floor surface 3d. Specifically, when the lifting unit 5 is in the non-use position, the entire load receiving platform lifting device 4 is placed on the loading platform floor surface 3d.

[0027] Note that the up and down positions of the lifting unit 5 are opposite between the use position and the non-use position. Further, the reversing mechanism 14 may reverse the lifting unit 5, for example, by manual force (e.g., turning the handle 14a), or may reverse the lifting unit 5, for example, by a drive source (e.g., a motor).

[0028] The rotating mechanism 15 is fixed to the floor portion 3a of the loading platform 3 as in this embodiment, for example, and connects the base portion 12 and the floor portion 3a of the loading platform 3 so that the base portion 12 can rotate about the vertical direction D3 with respect to the floor portion 3a of the loading platform 3. Thereby, as shown in FIGS. 4 and 5, the lifting unit 5 can rotate about the vertical direction D3 between the non-use position (see FIG. 4) and the storage position (see FIG. 5).

[0029] Note that when the lifting unit 5 is in the non-use position, the cross member 9 is arranged to extend in the left-right direction D2, and when the lifting unit 5 is in the storage position, the cross member 9 is arranged to extend in the front-rear direction D1. Further, the rotating mechanism 15 may rotate the base portion 12 and the lifting unit 5, for example, by manual force, or may rotate the base portion 12 and the lifting unit 5, for example, by a drive source (e.g., a motor).

[0030] In this way, the lifting unit 5 can move to the use position (see FIGS. 1 to 3), the non-use position (see FIG. 4), and the storage position (see FIG. 5) respectively. In this specification, unless otherwise specified, the front-rear direction D1 (front, rear, forward, backward), the left-right direction D2 (left, right, leftward, rightward), and the vertical direction D3 (upward, downward, upwardly, downwardly) are the directions D1 to D3 when the lifting unit 5 is in the use position.

[0031] As shown in FIGS. 6 and 7, the lifting unit 5 may include, for example, a first guide roller 16 that guides the outer peripheral surface of the inner column 8, a second guide roller 17 that is guided by the inner peripheral surface of the outer column 7, and third guide rollers 18, 18 that are guided by the inner peripheral surface of the inner column 8.

[0032] The first guide roller 16 may be configured to be disposed inside and at the lower part of the outer column 7 and outside the inner column 8, for example, as in the present embodiment. Further, the first guide roller 16 may be configured to be rotatably connected to the outer column 7 about the left - right direction D2 and fixed so that the position of the rotation axis remains stationary, for example, as in the present embodiment. Then, the first guide roller 16 guides the outer peripheral surface of the front wall 8c of the inner column 8.

[0033] The second guide roller 17 may be configured to be disposed inside the outer column 7 and connected to the upper end of the inner column 8, for example, as in the present embodiment. Further, the second guide roller 17 may be configured to be rotatably connected to the inner column 8 about the left - right direction D2 and the position of the rotation axis moves as the inner column 8 moves, for example, as in the present embodiment. Then, the second guide roller 17 is guided by the inner peripheral surface of the rear wall 7a of the outer column 7.

[0034] The third guide rollers 18, 18 may be configured to be disposed inside the inner column 8 and connected to the slider 10, for example, as in the present embodiment. Further, the third guide rollers 18, 18 may be configured to be rotatably connected to the slider 10 about the left - right direction D2 and the position of the rotation axis moves as the slider 10 moves, for example, as in the present embodiment.

[0035] Then, the third guide roller 18 is guided by the inner peripheral surface of the inner column 8. Specifically, in the present embodiment, the upper third guide roller 18 is guided by the inner peripheral surface of the rear wall 8a of the inner column 8, and the lower third guide roller 18 is guided by the inner peripheral surface of the front wall 8c of the inner column 8.

[0036] As shown in FIGS. 8 to 10, the elevating unit 5 includes an elevating mechanism 20 that moves the load receiving platform 11. The elevating mechanism 20 may include, for example, ropes 21a and 21b having a first end fixed to the upper end of the slider 10, upper sheaves 22a and 22b, lower sheaves 23a and 23b, and fixed sheaves 24a to 24e that are fixed so that the position of the rotating shaft is immovable, a moving unit 40 having moving sheaves 25a to 25f, and a driving device 30 that moves the moving unit 40.

[0037] The upper sheaves 22a and 22b may be configured to be disposed inside and at the upper part of the outer column 7 and rotatable about the left - right direction D2, for example, as in the present embodiment. The lower sheaves 23a and 23b may be configured to be disposed inside the outer column 7 and the cross - member 9 and at the lower part of the outer column 7 and rotatable about the front - rear direction D1, for example, as in the present embodiment.

[0038] The fixed sheaves 24a to 24e may be configured to be disposed inside the cross - member 9 and rotatable about the front - rear direction D1, for example, as in the present embodiment. Note that the fixed sheaves 24a to 24e may include, for example, as in the present embodiment, a plurality of upper fixed sheaves 24a and 24b arranged coaxially, and a plurality of lower fixed sheaves 24c to 24e arranged below the upper fixed sheaves 24a and 24b and coaxially.

[0039] The moving sheaves 25a to 25f may be configured to be disposed inside the cross - member 9 and rotatable about the front - rear direction D1, for example, as in the present embodiment. Note that the moving sheaves 25a to 25f may include, for example, as in the present embodiment, a plurality of upper moving sheaves 25a to 25c arranged coaxially, and a plurality of lower moving sheaves 25d to 25f arranged below the upper moving sheaves 25a to 25c and coaxially.

[0040] The first rope 21a may be wound, for example, as in the present embodiment, from the first end side fixed to the slider 10, in the order of the first upper sheave 22a, the first lower sheave 23a, the first upper moving sheave 25a, the first upper fixed sheave 24a, the second upper moving sheave 25b, the second upper fixed sheave 24b, and the third upper moving sheave 25c. And the second end of the first rope 21a may be fixed to the first rope fixing portion 26, for example, as in the present embodiment.

[0041] The second rope 21b may be wound, for example, as in the present embodiment, from the first end side fixed to the slider 10, in the order of the second upper sheave 22b, the second lower sheave 23b, the first lower fixed sheave 24c, the first lower moving sheave 25d, the second lower fixed sheave 24d, the second lower moving sheave 25e, the third lower fixed sheave 24e, and the third lower moving sheave 25f. And the second end of the second rope 21b may be fixed to the second rope fixing portion 27, for example, as in the present embodiment.

[0042] The drive device 30 may include, for example, as in the present embodiment, a cylinder 31 that can expand and contract in the axial direction (hereinafter also referred to as the "cylinder axial direction", and in the present embodiment, the front-rear direction) D2, a drive unit 32 that expands and contracts the cylinder 31, and a control unit 33 that controls the drive unit 32 in order to control the expansion and contraction operation of the cylinder 31. The cylinder 31 may include, for example, a cylindrical cylinder body 34 connected to the outer column 7, and a cylinder rod 35 partially inserted into the cylinder body 34 and moving in the cylinder axial direction D2 with respect to the cylinder body 34.

[0043] Then, when the cylinder rod 35 moves in the cylinder axial direction D2, the moving unit 40 moves in the cylinder axial direction D2, and the slider 10 and the load receiving base 11 move in the vertical direction D3. Therefore, the slider 10 and the load receiving base 11 move integrally with the inner column 8 in the vertical direction D3 with respect to the outer column 7, or the slider 10 and the load receiving base 11 move in the vertical direction D3 with respect to the inner column 8 and the outer column 7. In this way, the moving sheaves 25a to 25f are sheaves whose rotation axis positions move.

[0044] Note that, for example, as in this embodiment, when the cylinder 31 extends, that is, when the moving unit 40 moves in a direction away from the cylinder main body 34 (left direction), the slider 10 and the load receiving base 11 may be configured to move upward. In such a configuration, when the cylinder 31 contracts, that is, when the moving unit 40 moves in a direction approaching the cylinder main body 34 (right direction), the slider 10 and the load receiving base 11 move downward.

[0045] Although not particularly limited, the cylinder 31 may be, for example, a hydraulic cylinder as in this embodiment. In such a configuration, the drive unit 32 may include, for example, a hydraulic pump, an oil tank, a solenoid valve, etc. Note that the cylinder 31 is not limited to such a configuration and may be, for example, an electric cylinder or, for example, an electromagnetic cylinder.

[0046] As shown in FIGS. 10 and 11, the cross member 9 may include, for example, fixed walls 9a to 9c fixed to the outer column 7 and a detachable wall 9d detachable from the fixed walls 9a to 9c. Thereby, when the detachable wall 9d is detached from the fixed walls 9a to 9c, for example, the inside of the cross member 9 can be checked or the configuration inside the cross member 9 can be adjusted. Although not particularly limited, in this embodiment, the upper wall 9a, the lower wall 9b, and the front wall 9c are the fixed walls 9a to 9c, and the rear wall 9d is the detachable wall 9d.

[0047] The elevating mechanism 20 may include, for example, a guide portion 28 that guides the moving unit 40 in the cylinder axis direction D2 as in this embodiment. And the moving unit 40 may be configured to include, for example, a pair of plate-shaped brackets 41, 41 that rotatably support the moving sheaves 25a to 25f with the front-rear direction D1 interposed therebetween, and a guided portion 42 guided by the guide portion 28 as in this embodiment.

[0048] As a result, by the guide portion 28 guiding the guided portion 42, the moving unit 40 is guided in the cylinder axis direction D2. Therefore, the moving unit 40 can be stably moved in the cylinder axis direction D2.

[0049] The guide portion 28 may, for example, protrude in the front-rear direction D1 from the front wall 9c of the cross member 9 as in the present embodiment. Further, the guide portion 28 may, for example, extend along the cylinder axis direction D2 and be formed in a rail shape as in the present embodiment.

[0050] The guided portion 42 may, for example, protrude in the front-rear direction D1 from the bracket 41 as in the present embodiment. Further, the guided portion 42 may, for example, be formed in a block shape as in the present embodiment. Note that the present invention is not limited to such a configuration, and the guided portion 42 may be, for example, a guide roller.

[0051] Further, the guided portions 42, 42 may, for example, sandwich the guide portion 28 in the vertical direction D3 as in the present embodiment. As a result, it is possible to effectively suppress the moving unit 40 from moving with play, and thus it is possible to effectively suppress the moving sheaves 25a to 25f from moving with play.

[0052] As shown in FIGS. 11 and 12, the moving unit 40 may include, for example, a transmission portion 43 that connects a pair of brackets 41, 41 and transmits a force to and from the cylinder rod 35, a cylindrical rod insertion portion 44 that is fixed to the transmission portion 43 and inserted into the cylinder rod 35, a first reinforcing portion 45 that is fixed to each of the pair of moving brackets 41, 41, and a second reinforcing portion 46 that is fixed to the rod insertion portion 44 and the bracket 41, respectively.

[0053] The transmission part 43 may be arranged, for example, as in the present embodiment, so as to include the central position in the vertical direction D3 of the bracket 41. Further, the transmission part 43 may be arranged, for example, as in the present embodiment, between the axes of the upper moving sheaves 25a to 25c and the axes of the lower moving sheaves 25d to 25f in the vertical direction D3. Thereby, for example, since the position where the force is transmitted to the cylinder rod 35 is close to the center of gravity of the moving unit 40, the moving unit 40 can be stably moved.

[0054] As shown in FIGS. 11 to 16, the transmission part 43 may have a configuration in which, for example, it hits the cylinder rod 35 in the cylinder axis direction D2 and is separated from the cylinder rod 35. Thereby, when the drive part 32 (see FIG. 10) applies a force to the cylinder rod 35, the cylinder rod 35 pushes the transmission part 43 while when the drive part 32 stops applying a force to the cylinder rod 35, the transmission part 43 pushes the cylinder rod 35.

[0055] For example, when the drive part 32 applies a force to the cylinder rod 35 that is greater than the self-weight of the slider 10 and the load receiving base 11 (see FIGS. 6 to 8) (as well as the self-weight of the load placed on the load receiving base 11), the cylinder rod 35 pushes the transmission part 43 in the direction away from the cylinder main body 34 (left direction). Thereby, when the cylinder rod 35 moves in the direction away from the cylinder main body 34, the cylinder 31 extends, so the slider 10 and the load receiving base 11 move upward.

[0056] Further, for example, when the drive part 32 stops applying a force to the cylinder rod 35, the transmission part 43 pushes the cylinder rod 35 in the direction approaching the cylinder main body 34 (right direction) by the force due to the self-weight of the slider 10 and the load receiving base 11 (as well as the self-weight of the load placed on the load receiving base 11). Thereby, when the cylinder rod 35 moves in the direction approaching the cylinder main body 34, the cylinder 31 contracts, so the slider 10 and the load receiving base 11 move downward.

[0057] Incidentally, the moving unit 40 may include, for example, as in this embodiment, a female screw member 47 having a female screw portion 47a that is screwed onto a male screw member X1 (see FIGS. 17 to 21) in an emergency, and a screw fixing member 48 fixed to the female screw member 47. In FIGS. 13 to 16 (the same applies to FIGS. 22 and 23), the moving sheaves 25a to 25f are not shown.

[0058] The axial direction of the female screw portion 47a (hereinafter also referred to as the "screw axial direction") D2 is parallel to the cylinder axial direction D2, and in this embodiment, it is the left-right direction D2. Further, the female screw portion 47a may overlap the cylinder rod 35 when viewed in the screw axial direction D2, for example, as in this embodiment. Although not particularly limited, in this embodiment, the female screw member 47 and the screw fixing member 48 constitute the transmission portion 43.

[0059] The female screw member 47 may include, for example, as in this embodiment, a cylindrical screw main body portion 47b having a female screw portion 47a on its inner periphery, and a flange portion 47c protruding radially outward from the outer periphery of the screw main body portion 47b. And, for example, as in this embodiment, the flange portion 47c of the female screw member 47 and the screw fixing member 48 may be in contact with each other in the screw axial direction D2.

[0060] As a result, the flange portion 47c of the female screw member 47 and the screw fixing member 48 are each provided with contact portions 47d and 48a that are in contact with each other. And the first contact portion 47d of the female screw member 47 may be disposed, for example, as in this embodiment, between the second contact portion 48a of the screw fixing member 48 and the cylinder main body 34 in the screw axial direction D2. Although not particularly limited, in this embodiment, the female screw member 47 and the screw fixing member 48 are fixed by welding, and the welded portion (welding portion) 49 is shown by round dots in FIGS. 14 and 16 (the same applies to FIGS. 22 and 23).

[0061] Incidentally, when the cylinder rod 35 pushes the transmission part 43 in the direction away from the cylinder main body 34 (left direction), the first contact part 47d pushes the second contact part 48a, whereby the transmission part 43 is transmitted with force from the cylinder rod 35. On the other hand, when the transmission part 43 pushes the cylinder rod 35 in the direction approaching the cylinder main body 34 (right direction), the second contact part 48a pushes the first contact part 47d, whereby the transmission part 43 transmits force to the cylinder rod 35.

[0062] Therefore, in either case, it is possible to suppress the application of a force in the direction in which the female screw member 47 and the screw fixing member 48 separate from each other to the welded portion 49 between the female screw member 47 and the screw fixing member 48. As a result, for example, it is possible to suppress the cracking of the welded portion 49 between the female screw member 47 and the screw fixing member 48.

[0063] The configurations of the vehicle 1 and the load receiving platform lifting device 4 according to the present embodiment are as described above. Next, the moving method of the moving unit 40 according to the present embodiment will be described with reference to FIGS. 17 to 21. Note that the following method is exemplified to assist in understanding the moving method of the moving unit 40 and does not limit the moving method of the moving unit 40.

[0064] For example, when the drive device 30 (for example, the drive unit 32, the control unit 33) malfunctions and no force is applied to the cylinder rod 35, the load receiving platform 11 will be located at the lower end position (see FIG. 1). On the other hand, in order to drive the vehicle 1, for example, since it is necessary to place the load receiving platform 11 in the stored posture (see FIG. 3), it is necessary to move the load receiving platform 11 to the upper end position.

[0065] Therefore, as shown in FIG. 17, the male screw portion X1a of the male screw member X1 is inserted into the through holes 7c, 7c (see also FIGS. 6 and 7) of the outer column 7. The through holes 7c of the outer column 7 are arranged so as to overlap the female screw portion 47a in the view in the screw axis direction D2. Although not particularly limited, a bearing X2 may be provided between the head X1b of the male screw member X1 and the outer column 7. In FIG. 17 (the same applies to FIGS. 18 to 21), the moving unit 40 is shown in a longitudinal section.

[0066] Then, by turning the head X1b with a tool (not shown), as shown in FIG. 18, the male screw portion X1a of the male screw member X1 is screwed into the female screw portion 47a of the moving unit 40. At this time, since the head X1b is abutted against the outer column 7 via the bearing X2, the position of the head X1b, which is the end portion of the male screw member X1, is in a fixed state. And since the screw axis direction D2 is parallel to the cylinder axis direction D2, further, by turning the head X1b with a tool, as shown in FIG. 19, the moving unit 40 moves in the cylinder axis direction D2.

[0067] Since the moving unit 40 is separated from the cylinder rod 35, when the male screw portion X1a of the male screw member X1 is screwed into the female screw portion 47a of the moving unit 40, only the moving unit 40 can be moved without moving the cylinder rod 35. Thereby, the force required to move the moving unit 40 can be reduced.

[0068] Also, at this time, the guide portion 28 abuts against the guided portion 42 of the moving unit 40 in the axial rotation direction of the female screw portion 47a (see FIG. 11). Thereby, when the male screw portion X1a of the male screw member X1 is screwed into the female screw portion 47a of the moving unit 40, the rotation of the moving unit 40 in the axial rotation direction of the female screw portion 47a can be suppressed.

[0069] Moreover, since the female screw portion 47a overlaps with the cylinder rod 35 in the screw axis direction D2 view (see FIG. 11), in the event of an emergency, the position where force is applied from the male screw member X1 to the moving unit 40 (i.e., the position of the female screw portion 47a) is close to the position where force is applied from the cylinder rod 35 to the moving unit 40 (i.e., the position of the transmission portion 43) during normal times. As a result, even in the event of an emergency, the moving unit 40 can be moved in the same manner as during normal times.

[0070] Note that the screw axis direction D2 is parallel to the cylinder axis direction D2. In this specification, "parallel" includes not only "completely parallel" but also "substantially parallel". "Substantially parallel" means that when the male screw member X1 is screwed into the female screw portion 47a, the moving unit 40 moves and the slider 10 can move in the vertical direction D3 to such an extent of "parallel".

[0071] By the way, the first contact portion 47d of the female screw member 47 is disposed in the screw axis direction D2 between the second contact portion 48a of the screw fixing member 48 and the cylinder body 34 (see FIGS. 14 and 16). More specifically, the first contact portion 47d of the female screw member 47 is disposed in the screw axis direction D2 between the second contact portion 48a of the screw fixing member 48 and the cylinder rod 35. Thereby, when the moving unit 40 moves in a direction away from the cylinder body 34 as the male screw member X1 is screwed into the female screw portion 47a, the first contact portion 47d pushes the second contact portion 48a, and the female screw member 47 transmits the force received from the male screw member X1 to the screw fixing member 48.

[0072] Therefore, it is possible to suppress the application of a force in a direction in which the female screw member 47 and the screw fixing member 48 separate to the welding portion 49 (see FIGS. 14 and 16) between the female screw member 47 and the screw fixing member 48. As a result, for example, it is possible to suppress the cracking of the welding portion 49 between the female screw member 47 and the screw fixing member 48.

[0073] In this way, in an emergency, the moving unit 40 can be moved in a direction away from the cylinder main body 34, so that the load receiving table 11 (see FIGS. 6 to 9) can be moved to the upper end position. Note that turning the head X1b of the male screw member X1 may be performed, for example, manually or, for example, using a device (for example, a motor).

[0074] Also, another moving method of the moving unit 40 will be described with reference to FIGS. 20 and 21.

[0075] By turning the head X1b with a tool (not shown), as shown in FIG. 20, the male screw portion X1a of the male screw member X1 is screwed with the female screw portion 47a of the moving unit 40. At this time, since the tip of the male screw member X1 is abutted against the cylinder rod 35, the position of the tip of the male screw member X1 is in a fixed state.

[0076] And since the screw axis direction D2 is parallel to the cylinder axis direction D2, further, by turning the head X1b with a tool, as shown in FIG. 21, the moving unit 40 moves in the cylinder axis direction D2. In this way, in an emergency, the moving unit 40 can be moved in a direction away from the cylinder main body 34, so that the load receiving table 11 (see FIGS. 6 to 9) can be moved to the upper end position. Note that, for example, when only the moving method according to FIGS. 20 and 21 is performed, the outer column 7 may not be provided with the through hole 7c.

[0077] [1] From the above, the load receiving table lifting device 4 is, as in the present embodiment, a support column 7 extending in the vertical direction D3, a slider 10 disposed across the inside and outside of the support column 7 and moving in the vertical direction D3 with respect to the support column 7, a load receiving table 11 connected to the slider 10, ropes 21a, 21b connected to the slider 10, a cylinder 31 that can expand and contract in the axial direction D2, It has moving sheaves 25a to 25f around which the ropes 21a and 21b are wound, and includes a moving unit 40 that moves in the axial direction D2 of the cylinder 31 in order to move the slider 10 in the vertical direction D3. The cylinder 31 includes a cylinder body 34, and includes a cylinder rod 35 that moves in the axial direction D2 of the cylinder 31 with respect to the cylinder body 34 in order to move the moving unit 40 in the axial direction D2 of the cylinder 31. The moving unit 40 preferably has a female screw portion 47a whose axial direction D2 is parallel to the axial direction D2 of the cylinder 31 and that is screwed onto a male screw member X1 in an emergency. Such a configuration is preferable.

[0078] According to such a configuration, since the axial direction D2 of the female screw portion 47a is parallel to the axial direction D2 of the cylinder 31, in an emergency, with the position of the end portion of the male screw member X1 fixed, the male screw member X1 is screwed onto the female screw portion 47a, whereby the moving unit 40 moves in the axial direction D2 of the cylinder 31. Thereby, the moving unit 40 can be moved in an emergency.

[0079] [2] Further, in the load receiving platform lifting device 4 of the above [1], as in the present embodiment, the moving unit 40 includes a female screw member 47 having the female screw portion 47a, and includes a screw fixing member 48 to which the female screw member 47 is fixed by welding. The female screw member 47 includes a first abutting portion 47d that abuts against the screw fixing member 48 in the axial direction D2 of the female screw portion 47a. The screw fixing member 48 includes a second abutting portion 48a that abuts against the first abutting portion 47d in the axial direction D2 of the female screw portion 47a. The first abutting portion 47d is disposed between the second abutting portion 48a and the cylinder body 34 in the axial direction D2 of the female screw portion 47a. Such a configuration is preferable.

[0080] According to such a configuration, when in an emergency, the male screw member X1 is screwed with the female screw portion 47a and the moving unit 40 moves in a direction away from the cylinder main body 34, the first abutting portion 47d of the female screw member 47 pushes the second abutting portion 48a of the screw fixing member 48, so that the female screw member 47 transmits the force received from the male screw member X1 to the screw fixing member 48. Therefore, it is possible to suppress the application of a force in a direction in which the female screw member 47 and the screw fixing member 48 separate from each other to the welded portion 49 between the female screw member 47 and the screw fixing member 48.

[0081] [3] Further, in the load receiving base lifting device 4 of the above [1] or [2], as in the present embodiment, the female screw portion 47a overlaps with the cylinder rod 35 when viewed in the axial direction D2 of the female screw portion 47a, such a configuration is preferable.

[0082] According to such a configuration, since the female screw portion 47a overlaps with the cylinder rod 35 when viewed in the axial direction D2 of the female screw portion 47a, the position where a force is applied from the male screw member X1 to the moving unit 40 (that is, the position of the female screw portion 47a) is close to the position where a force is applied from the cylinder rod 35 to the moving unit 40. Thereby, even in an emergency, the moving unit 40 can be moved in the same manner as in normal times.

[0083] [4] Further, in the load receiving base lifting device 4 of any one of the above [1] to [3], as in the present embodiment, the moving unit 40 is separated from the cylinder rod 35 or is separably connected to the cylinder rod 35 (in the present embodiment, it is separated from the cylinder rod 35), such a configuration is preferable.

[0084] According to such a configuration, in a state where the cylinder rod 35 is separated from the moving unit 40, in an emergency, the male screw member X1 is screwed into the female screw portion 47a, so that only the moving unit 40 can be moved without moving the cylinder rod 35. Thereby, the force required to move the moving unit 40 in an emergency can be reduced.

[0085] [5] Further, any one of the load receiving platform lifting devices 4 of the above [1] to [4], as in this embodiment, includes a guide portion 28 that guides the moving unit 40 in the axial direction D2 of the cylinder 31, and the guide portion 28 abuts the moving unit 40 in the circumferential direction around the axis of the female screw portion 47a, and such a configuration is preferable.

[0086] According to such a configuration, since the guide portion 28 guides the moving unit 40 in the axial direction D2 of the cylinder 31, the moving unit 40 can be stably moved in the axial direction D2 of the cylinder 31. Moreover, since the guide portion 28 abuts the moving unit 40 in the circumferential direction around the axis of the female screw portion 47a, when the male screw member X1 is screwed into the female screw portion 47a in an emergency, the moving unit 40 can be suppressed from rotating in the circumferential direction around the axis of the female screw portion 47a.

[0087] [6] Further, the vehicle 1, as in this embodiment, includes any one of the load receiving platform lifting devices 4 of the above [1] to [5], and a load platform 3 to which the load receiving platform lifting device 4 is attached, and such a configuration is preferable.

[0088] According to such a configuration, the moving unit 40 can be moved in an emergency.

[0089] Note that the vehicle 1 and the loading platform lifting device 4 are not limited to the configurations of the above-described embodiments, nor are they limited to the above-described functions and effects. Further, the vehicle 1 and the loading platform lifting device 4 can of course be variously modified without departing from the gist of the present invention. For example, it goes without saying that one or more of the configurations and methods according to the following various modification examples can be arbitrarily selected and adopted in the configurations and methods according to the above-described embodiments.

[0090] (A) In the loading platform lifting device 4 according to the above-described embodiment, the female screw member 47 having the female screw portion 47a includes a flange portion 47c, that is, it is a nut with a collar. However, the loading platform lifting device 4 is not limited to such a configuration.

[0091] (A-1) For example, the female screw member 47 having the female screw portion 47a may be configured not to include a flange portion 47c, that is, it is a general nut. Although not particularly limited, as an example of such a configuration, the female screw member 47 may have the configuration shown in FIG. 22.

[0092] The female screw member 47 according to FIG. 22 is fixed to the screw fixing member 48 by the welding portion 49. And the first abutting portion 47d of the female screw member 47 is disposed between the second abutting portion 48a of the screw fixing member 48 and the cylinder main body 34 in the axial direction D2 of the female screw portion 47a. More specifically, the first abutting portion 47d of the female screw member 47 is disposed between the second abutting portion 48a of the screw fixing member 48 and the cylinder rod 35 in the axial direction D2 of the female screw portion 47a.

[0093] (A-2) Further, for example, the female screw member 47 having the female screw portion 47a may be configured not as various nuts but as a plate material formed with a female screw portion. Although not particularly limited, as an example of such a configuration, the female screw member 47 may have the configuration shown in FIG. 23.

[0094] The female threaded member 47 according to FIG. 23 is a plate material formed with a female threaded portion 47a. And the female threaded member 47 connects a pair of brackets 41, 41. Thereby, the female threaded member 47 constitutes a transmission portion 43 that transmits force to and from the cylinder rod 35.

[0095] (B) Also, in the load receiving platform lifting device 4 according to the above embodiment, the female threaded member 47 and the screw fixing member 48 are provided with abutting portions 47d, 48a that abut against each other in the axial direction D2 of the female threaded portion 47a. The first abutting portion 47d of the female threaded member 47 is arranged between the second abutting portion 48a of the screw fixing member 48 and the cylinder main body 34 in the axial direction D2 of the female threaded portion 47a. However, the load receiving platform lifting device 4 is not limited to such a configuration.

[0096] For example, the second abutting portion 48a of the screw fixing member 48 may be arranged between the first abutting portion 47d of the female threaded member 47 and the cylinder main body 34 in the axial direction D2 of the female threaded portion 47a. Also, for example, the female threaded member 47 may be configured to be separated from the screw fixing member 48 in the axial direction D2 of the female threaded portion 47a and to abut against the screw fixing member 48 at the outer peripheral portion.

[0097] (C) Also, in the load receiving platform lifting device 4 according to the above embodiment, the female threaded member 47 is fixed to the screw fixing member 48 by welding. However, the load receiving platform lifting device 4 is not limited to such a configuration. For example, the female threaded member 47 may be fixed to the screw fixing member 48 by being clamped by the screw fixing member 48, or, for example, the female threaded member 47 may be fixed to the screw fixing member 48 by a fixture (for example, a screw member).

[0098] (D) Also, in the load receiving platform lifting device 4 according to the above embodiment, the female threaded portion 47a overlaps with the cylinder rod 35 when viewed in the axial direction D2 of the female threaded portion 47a. However, the load receiving platform lifting device 4 is not limited to such a configuration. For example, the female threaded portion 47a may be configured to be separated from the cylinder rod 35 when viewed in the axial direction D2 of the female threaded portion 47a.

[0099] (E) Further, in the load receiving platform lifting device 4 according to the above embodiment, the moving unit 40 is configured to be separated from the cylinder rod 35 during normal times. However, the load receiving platform lifting device 4 is not limited to such a configuration.

[0100] For example, the moving unit 40 may be configured to be separably connected to the cylinder rod 35 by a detachable connecting member during normal times, while the moving unit 40 is separated from the cylinder rod 35 by detaching the connecting member during an emergency. Also, for example, the moving unit 40 may be configured to be fixedly connected to the cylinder rod 35 inseparably by welding or the like.

[0101] (F) Further, the load receiving platform lifting device 4 according to the above embodiment is configured to include a guide portion 28 that guides the moving unit 40 in the axial direction D2 of the cylinder 31 and stops the moving unit 40 in the circumferential direction around the axis of the female screw portion 47a. However, the load receiving platform lifting device 4 is not limited to such a configuration. For example, the load receiving platform lifting device 4 may be configured not to include the guide portion 28.

[0102] (G) Further, in the load receiving platform lifting device 4 according to the above embodiment, the guided portion 42 is configured to include a pair that sandwiches the guide portion 28 in the vertical direction D3. However, the load receiving platform lifting device 4 is not limited to such a configuration.

[0103] For example, the guide portion 28 may be configured to include a pair that sandwiches the guided portion 42 in the vertical direction D3. Also, for example, the guide portion 28 may be configured to be disposed only above the guided portion 42, and also, for example, the guide portion 28 may be configured to be disposed only below the guided portion 42. Also, for example, the guided portion 42 may be configured to be disposed only above the guide portion 28, and also, for example, the guided portion 42 may be configured to be disposed only below the guide portion 28.

[0104] (H) Further, in the load receiving platform lifting device 4 according to the above embodiment, the driving unit 32 applies a force to the cylinder rod 35, whereby the cylinder 31 extends, while the driving unit 32 stops applying a force to the cylinder rod 35, whereby the cylinder 31 contracts. However, the load receiving platform lifting device 4 is not limited to such a configuration.

[0105] For example, a configuration may be adopted in which the driving unit 32 applies a force to the cylinder rod 35, whereby the cylinder 31 extends, and the driving unit 32 applies a force to the cylinder rod 35, whereby the cylinder 31 contracts. That is, a configuration may be adopted in which the driving unit 32 applies a force to the cylinder rod 35, whereby the cylinder 31 extends and contracts.

[0106] (I) Further, in the load receiving platform lifting device 4 according to the above embodiment, the cylinder 31 is arranged inside the cross member 9. However, the load receiving platform lifting device 4 is not limited to such a configuration. For example, the cylinder 31 may be arranged so as to be exposed outside the cross member 9, or for example, the cylinder 31 may be arranged inside a case arranged outside the cross member 9.

[0107] (J) Further, in the load receiving platform lifting device 4 according to the above embodiment, the cylinder 31 expands and contracts in the left - right direction D2, that is, the cylinder rod 35 moves in the left - right direction D2 with respect to the cylinder body 34. However, the load receiving platform lifting device 4 is not limited to such a configuration.

[0108] For example, the cylinder 31 may expand and contract in the front - rear direction D1, that is, the cylinder rod 35 moves in the front - rear direction D1 with respect to the cylinder body 34. Also, for example, the cylinder 31 may expand and contract in the up - down direction D3, that is, the cylinder rod 35 moves in the up - down direction D3 with respect to the cylinder body 34.

[0109] (K) Further, the load receiving platform lifting device 4 according to the above embodiment is configured to include a pair (two) of columns (outer columns) 7 and sliders 10 respectively. However, the load receiving platform lifting device 4 is not limited to such a configuration. For example, it may be configured to include one column (outer column) 7 and one slider 10 respectively.

[0110] (L) Further, in the load receiving platform lifting device 4 according to the above embodiment, since the lifting unit 5 can be moved to the use position, the non-use position, and the storage position by the inversion mechanism 14 and the rotation mechanism 15, the column (outer column) 7 is configured to be movable relative to the loading platform 3. However, the load receiving platform lifting device 4 is not limited to such a configuration.

[0111] For example, the column (outer column) 7 may be fixedly and immovably attached to the loading platform 3. Specifically, the load receiving platform lifting device 4 may be configured not to include the inversion mechanism 14 and the rotation mechanism 15. In such a configuration, for example, at least one of the column (outer column) 7 and the cross member 9 may be fixed to the loading platform 3 by welding, fastening means (bolts and nuts), or the like.

[0112] Further, for example, the base portion 12 may be fixedly and immovably attached to the loading platform 3, and the lifting unit 5 may be configured to be rotatable between the use position and the non-use position. Specifically, the load receiving platform lifting device 4 may be configured to include the inversion mechanism 14 while not including the rotation mechanism 15. In such a configuration, for example, the base portion 12 may be fixed to the loading platform 3 by welding, fastening means (bolts and nuts), or the like.

[0113] (M) Further, the load receiving platform lifting device 4 according to the above embodiment is configured to include an inner column 8. However, the load receiving platform lifting device 4 is not limited to such a configuration. For example, the load receiving platform lifting device 4 may be configured not to include the inner column 8, and a third guide roller 18 rotatably connected to the slider 10 may be guided by the inner peripheral surface of the column 7.

[0114] (N) Further, in the vehicle 1 according to the above embodiment, the loading platform lifting device 4 is configured to be directly attached to the loading platform 3. However, the loading platform lifting device 4 is not limited to such a configuration. For example, the loading platform lifting device 4 may be configured to be indirectly attached to the loading platform 3 by being attached to the vehicle body 2.

[0115] (O) Note that, for example, in the methods and apparatuses shown in the claims, the specification, and the drawings, the execution order of each step such as operations, procedures, steps, and stages in the apparatuses can be realized in any order as long as the result of the previous step is not used in the subsequent step. For example, even if it is described for convenience using "first", "next", etc., it does not mean that it is essential to execute in this order.

Explanation of Reference Numerals

[0116] 1... Vehicle, 2... Body, 2a... Body frame, 3... Loading platform, 3a... Floor part, 3b... Side wall, 3c... Sliding door, 3d... Loading platform floor surface, 4... Loading platform lifting device, 5... Lifting unit, 6... Mounting unit, 7... Column (outer column), 7a... Rear wall, 7b... Column slit (outer slit), 7c... Through hole, 8... Inner column, 8a... Rear wall, 8b... Inner slit, 8c... Front wall, 9... Cross member, 9a~9c... Fixed wall, 9d... Detachable wall, 10... Slider, 11... Loading stand, 11a... First plate, 11b... Second plate, 12... Base part, 13... Lock pin, 14... Reversal mechanism, 15... Rotation mechanism, 16... First guide roller, 17... Second guide roller, 18... Third guide roller, 20... Lifting mechanism, 21a, 21b... Rope, 22a, 22b... Upper sheave, 23a, 23b... Lower sheave, 24a~24e... Fixed sheave, 25a~25f... Movable sheave, 26... First rope fixing part, 27... Second rope fixing part, 28... Guide part, 30... Driving device, 31... Cylinder, 32... Driving part, 33... Control part, 34... Cylinder body, 35... Cylinder rod, 40... Moving unit, 41... Bracket, 42... Guided part, 43... Transmission part, 44... Rod insertion part, 45... First reinforcement part, 46... Second reinforcement part, 47... Female screw member, 47a... Female screw part, 47b... Screw body part, 47c... Flange part, 47d... First contact part, 48... Screw fixing member, 48a... Second contact part, 49... Welded part, D1... Front-rear direction (first lateral direction), D2... Left-right direction (second lateral direction), D3... Up-down direction, X1... Male screw member, X1a... Male screw part, X1b... Head, X2... Bearing

Claims

1. A support column extending in the vertical direction, A slider disposed across the inside and outside of the support column and moving vertically with respect to the support column, A load receiving platform connected to the slider, A rope connected to the slider, A cylinder that can be telescoped in the axial direction, A moving unit that has a moving sheave around which the rope is wound and moves in the axial direction of the cylinder to move the slider in the vertical direction, and is provided with, The cylinder is, A cylinder body, A cylinder rod that moves in the axial direction of the cylinder with respect to the cylinder body to move the moving unit in the axial direction of the cylinder, and is provided with, The moving unit has an axial direction parallel to the axial direction of the cylinder and includes a female screw portion that is screwed into a male screw member in an emergency, a load receiving platform lifting device.

2. The moving unit is, A female screw member having the female screw portion, A screw fixing member to which the female screw member is fixed by welding, and is provided with, The female screw member includes a first abutting portion that abuts against the screw fixing member in the axial direction of the female screw portion, The screw fixing member includes a second abutting portion that abuts against the first abutting portion in the axial direction of the female screw portion, The first abutting portion is disposed between the second abutting portion and the cylinder body in the axial direction of the female screw portion, the load receiving platform lifting device according to claim 1.

3. The female screw portion overlaps the cylinder rod in a view in the axial direction of the female screw portion, the load receiving platform lifting device according to claim 1 or 2.

4. The moving unit is separated from the cylinder rod or is separably connected to the cylinder rod, the load receiving platform lifting device according to claim 1 or 2.

5. A guide portion for guiding the moving unit in the axial direction of the cylinder is provided, The guide portion abuts against the moving unit in the circumferential direction around the axis of the female screw portion, the load receiving platform lifting device according to claim 1 or 2.

6. A load receiving platform lifting device according to claim 1 or 2, A vehicle comprising a loading platform to which the load receiving platform lifting device is attached.

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