Loading platform lifting device and vehicle

Abstract

To provide a loading platform lifting device which can secure a length of inner parts inserted into columns when used in a state that the device is laterally inclined.SOLUTION: A loading platform lifting device includes: a pair of cylindrical columns extending in a vertical direction; inner parts each of which is inserted into the column and moves in the vertical direction relative to the column; and a cylindrical cross member extending in a lateral direction and connecting the pair of columns. The cross member includes a connection part connected to the columns. The column includes: an upper column part disposed above an upper end of the connection part; and a lower column part disposed below the upper end of the connection part. A length in the vertical direction of the lower column part is longer than a length in the vertical direction of the upper column part.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present specification relates to a platform lifting device and a vehicle. [Background technology]

[0002] Conventionally, for example, a load-receiving platform lifting device includes a pair of cylindrical support pillars extending in the vertical direction, and an inner part that is inserted into the support pillars and moves in the vertical direction relative to the support pillars (for example, Patent Document 1).

[0003] However, when the platform lifting device is used with the vehicle tilted to the left or right, the length of insertion of one of the inner parts into the support pillar may become short. In such a case, for example, the inner part may not be able to move smoothly up and down relative to the support pillar, or the inner part may come out of the support pillar. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-208438 A Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the object is to provide a loading platform lifting device and a vehicle that can ensure the length of the inner part that is inserted into the support pillar even when used in a state tilted to the left or right. [Means for solving the problem]

[0006] The loading platform lifting device is A pair of cylindrical supports extending in the vertical direction; an inner portion that is inserted into the support and moves vertically relative to the support; A tubular cross member extending laterally and connecting the pair of pillars, The cross member includes a connecting portion that is connected to the support pillar, The support pillar is an upper column portion disposed above an upper end of the connecting portion; a lower column portion disposed below an upper end of the connecting portion, The length of the lower column section in the up-down direction is longer than the length of the upper column section in the up-down direction.

[0007] The vehicle is The loading platform lifting device; and a loading platform to which the loading platform lifting device is attached. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view of the load receiving platform lifting device according to the embodiment, showing a state in which the lifting unit is located at the use position and the load receiving platform is located at the lower end position in the load receiving posture. [Diagram 2] FIG. 2 is a perspective view of the load receiving platform lifting / lowering device according to the embodiment, showing a state in which the lifting unit is located at the use position and the load receiving platform is located at the upper end position in the load receiving posture. [Diagram 3] FIG. 2 is a perspective view of the load receiving platform lifting / lowering device according to the embodiment, illustrating a state in which the lifting unit is located at the use position and the load receiving platform is in the storage position; [Figure 4] FIG. 2 is a perspective view of the loading platform lifting / lowering device according to the embodiment, showing a state in which the lifting / lowering unit is located in an unused position; [Diagram 5] FIG. 2 is a perspective view of the loading platform lifting / lowering device according to the embodiment, showing a state in which the lifting / lowering unit is located at a storage position. [Figure 6] FIG. 2 is a front view (viewed forward) of the load receiving platform lifting device according to the embodiment, showing a state in which the load receiving platform is positioned at the lower end position in the load receiving posture. [Figure 7] FIG. 2 is a right-side view of the load-receiving platform lifting device according to the embodiment, showing a state in which the load-receiving platform is positioned at the bottom end position in the load-receiving posture. [Figure 8]FIG. 2 is a right-side view of the load-receiving platform lifting device according to the embodiment, showing a state in which the load-receiving platform is positioned at the upper end position in the load-receiving posture. [Figure 9] FIG. 1 is a diagram showing a main part of the loading platform lifting device according to the embodiment (a: rearward view, b: cross-sectional view taken along line IX-IX in a). [Figure 10] Cross-sectional view of the main part taken along line XX in FIG. 7. [Figure 11] Cross-sectional view of the main part taken along line XI-XI in FIG. 7. [Figure 12] FIG. 1 is a front view of a main part of the inner part according to the embodiment; [Figure 13] FIG. 1 is a right-side view of the main part of the inner part according to the embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In each drawing, the dimensions of the components may be enlarged or reduced relative to the actual dimensions in order to facilitate understanding, and the dimensional ratios between the drawings may not be consistent. Note that in each drawing, some of the components may be omitted in order to facilitate understanding.

[0010] Terms including ordinal numbers such as first, second, etc. are used to describe various components, but these terms are used only for the purpose of distinguishing one component from another, and the components are not particularly limited by these terms. The number of components including ordinal numbers is not particularly limited, and may be, for example, one. In addition, the ordinal numbers used in the following specification and drawings may differ from the ordinal numbers described in the claims.

[0011] In the following description, the first direction (first horizontal direction) D1 is also called the front-rear direction D1, and the direction of the arrow in the figure is the front direction, and the direction opposite to the arrow in the figure is the rear direction. The second direction (second horizontal direction) D2 is also called the left-right direction D2, and the direction of the arrow in the figure is the left direction, and the direction opposite to the arrow in the figure is the right direction.

[0012] The third direction D3 is also called the up-down direction D3, and the direction of the arrow in each drawing is the up direction, and the direction opposite to the arrow in each drawing is the down direction. That is, each of the directions D1 to D3 is a direction seen by a person (driver) sitting in the driver's seat of the vehicle.

[0013] Hereinafter, an embodiment of the vehicle and the loading platform lifting / lowering device will be described with reference to Figures 1 to 13. Note that the following embodiment is provided as an example to aid in understanding the configuration of the vehicle and the loading platform lifting / lowering device, and is not intended to limit the configuration of the vehicle and the loading platform lifting / lowering device.

[0014] 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 loading platform lifting device 4 attached to the loading platform 3. The vehicle 1 is not particularly limited, and may be, for example, a loading vehicle as in this embodiment.

[0015] The loading platform 3 may include, for example, a floor 3a, a pair of side walls 3b, 3b provided on both the left and right sides of the floor 3a, and a gate 3c connected to the rear end of the floor 3a so as to be rotatable about an axis in the left-right direction D2, as in this embodiment. The loading platform 3 is open at the top in this embodiment, but is not limited to such a configuration and may be, for example, a box-like shape (specifically, a cargo box) having a ceiling and closed at the top.

[0016] The floor portion 3a has, for example, a loading platform floor surface 3d on which luggage is loaded. As a result, the space above the loading platform floor surface 3d becomes a loading space for luggage. The gate 3c may be rotatable between, for example, an open position (position shown in FIG. 1) where the gate 3c hangs downward from the floor portion 3a of the loading platform 3 and a closed position (not shown) where the gate 3c rises upward from the floor portion 3a of the loading platform 3.

[0017] The loading platform lifting device 4 is used, for example, when loading and unloading luggage from the rear of the loading platform 3 onto the loading platform floor surface 3d of the loading platform 3. The loading platform lifting device 4 may include, for example, a vertical lifting type lifting unit 5 and an attachment unit 6 for attaching the lifting unit 5 to the loading platform 3, as in this embodiment.

[0018] The lifting unit 5 may, for example, as in this embodiment, include a pair of cylindrical pillars (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 column 7 and moving in the vertical direction D3 relative to the outer column 7, and a cylindrical cross member 9 extending in the left-right direction D2 and connecting the pair of outer columns 7, 7.

[0019] In this embodiment, the outer column 7 has a support slit (hereinafter also referred to as an "outer slit") 7b extending in the up-down direction D3 in the rear wall 7a, and the inner column 8 has an inner slit 8b extending in the up-down direction D3 in the rear wall 8a. The outer slit 7b and the inner slit 8b communicate with each other in the front-rear direction D1 (see FIG. 10).

[0020] The lifting unit 5 may, for example, as in this embodiment, include a slider 10 that moves in the vertical direction D3 relative to the outer column 7 and the inner column 8, and a load receiving platform 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 being inserted through the outer slit 7b and the inner slit 8b.

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

[0022] The load receiving platform 11 may include, for example, a first plate 11a rotatably connected to the slider 10, and a second plate 11b rotatably connected to the first plate 11a, as in this embodiment. As a result, as shown in Figures 1 to 3, the load receiving platform 11 is deformable between a load receiving position (see Figures 1 and 2) in which the first and second plates 11a and 11b are unfolded and move along the front-rear direction D1, and a storage position (see Figure 3) in which the first and second plates 11a and 11b are folded and move along the up-down direction D3.

[0023] The mounting unit 6 may, for example, as in this embodiment, include a base portion 12 placed on the floor portion 3a of the loading platform 3, a lock pin 13 (see Figures 7 and 8) that fixes the base portion 12 to the floor portion 3a of the loading platform 3, an inversion mechanism 14 that inverts the lifting unit 5 around an axis in the left-right direction D2, and a rotation mechanism 15 that rotates the lifting unit 5 and the base portion 12 around an axis in the up-down direction D3.

[0024] 7 and 8, the lock pin 13 may, for example, fix the base portion 12 to the floor portion 3a of the loading platform 3 by sandwiching the base portion 12 and the floor portion 3a of the loading platform 3 in the up-down direction D3 as in this embodiment. The lock pin 13 may, for example, be detachable from the base portion 12 and the floor portion 3a of the loading platform 3. This allows the base portion 12 to be switched between a fixed state in which it is fixed to the floor portion 3a of the loading platform 3 and a movable state in which it is movable relative to the floor portion 3a of the loading platform 3.

[0025] 1 to 4, for example, as in this embodiment, the reversing mechanism 14 connects the lifting unit 5 to the base part 12 so that the lifting unit 5 is rotatable with respect to the base part 12. This allows the lifting unit 5 to be reversed between a use position (see Figs. 1 to 3) in which the load receiving platform 11 is used and a non-use position (see Fig. 4) in which the load receiving platform 11 is not used, as shown in Figs. 3 and 4.

[0026] 1 to 3, when the lifting unit 5 is in the use position, a portion of the outer column 7 is disposed below the loading platform floor surface 3d. In contrast, when the lifting unit 5 is in the unused position, the entire outer column 7 is disposed above the loading platform floor surface 3d, as shown in Fig. 4. Specifically, when the lifting unit 5 is in the unused position, the entire loading platform lifting device 4 is placed on the loading platform floor surface 3d.

[0027] The up and down of the lifting unit 5 is reversed between the use position and the non-use position. The reversing mechanism 14 may, for example, reverse the lifting unit 5 by manual force (for example, by turning the handle 14a), or may, for example, reverse the lifting unit 5 by a drive source (for example, a motor).

[0028] For example, as in this embodiment, the rotation mechanism 15 is fixed to the floor 3a of the loading platform 3 and connects the base part 12 to the floor part 3a of the loading platform 3 so that the base part 12 is rotatable on the floor part 3a of the loading platform 3. This allows the lifting unit 5 to rotate between a non-use position (see FIG. 4) and a storage position (see FIG. 5), as shown in FIG. 4 and FIG. 5.

[0029] When the lifting unit 5 is in the unused position, the cross member 9 is disposed so as to extend in the left-right direction D2, and when the lifting unit 5 is in the stored position, the cross member 9 is disposed so as to extend in the front-rear direction D1. The rotation mechanism 15 may rotate the base part 12 and the lifting unit 5 by, for example, human power, or may rotate the base part 12 and the lifting unit 5 by, for example, a drive source (for example, a motor).

[0030] In this way, the lifting unit 5 can be moved to a use position (see Figs. 1 to 3), a non-use position (see Fig. 4), and a storage position (see Fig. 5). In this specification, unless otherwise specified, the front-rear direction D1 (front, rear, front, rear), the left-right direction D2 (left, right, left, right), and the up-down direction D3 (up, down, up, down) are the directions D1 to D3 when the lifting unit 5 is located at the use position.

[0031] As shown in Figures 6 to 8, the lifting unit 5 may include, for example, a rope (not shown) having a first end fixed inside the cross member 9 and a second end fixed to the upper end of the slider 10, an upper sheave 21, a lower sheave 22 and a fixed sheave 23 that are wound around the rope and fixed so that the position of the rotating shaft is immovable, a movable sheave 24 whose position of the rotating shaft moves, and a drive source (e.g., an extendable cylinder) 16 that moves the movable sheave 24.

[0032] As a result, the drive source 16 moves the movable sheave 24 in the left-right direction D2, causing the slider 10 to move in the up-down direction D3. Therefore, the slider 10 and the load receiving platform 11 move integrally with the inner column 8 in the up-down direction D3 relative to the outer column 7, or the slider 10 and the load receiving platform 11 move in the up-down direction D3 relative to the inner column 8 and the outer column 7.

[0033] The upper sheave 21 may be configured, for example, as in this embodiment, to be disposed inside and at the upper part of the outer column 7 and to be rotatable about an axis in the left-right direction D2. The lower sheave 22 may be configured, for example, as in this embodiment, to be disposed inside the outer column 7 and the cross member 9 and at the lower part of the outer column 7 and to be rotatable about an axis in the front-rear direction D1.

[0034] The fixed sheave 23 may be arranged, for example, as in this embodiment, inside the cross member 9 and be rotatable about an axis in the fore-and-aft direction D1. The movable sheave 24 may be arranged, for example, as in this embodiment, inside the cross member 9 and be rotatable about an axis in the fore-and-aft direction D1.

[0035] In addition, the lifting unit 5 may be equipped with, for example, a first guide roller 25 that guides the outer peripheral surface of the inner column 8, a second guide roller 26 that is guided by the inner peripheral surface of the outer column 7, and third guide rollers 27, 27 that are guided by the inner peripheral surface of the inner column 8, as in this embodiment.

[0036] The first guide roller 25 may be configured, for example, as in this embodiment, to be disposed inside and at the bottom of the outer column 7 and disposed outside the inner column 8. Also, the first guide roller 25 may be configured, for example, as in this embodiment, to be connected to the outer column 7 so as to be rotatable about an axis in the left-right direction D2 and fixed so that the position of the rotation axis is immovable. The first guide roller 25 guides the outer peripheral surface of the front wall 8c of the inner column 8.

[0037] The second guide roller 26 may be configured, for example, as in this embodiment, to be disposed inside the outer column 7 and connected to the upper end of the inner column 8. Also, the second guide roller 26 may be configured, for example, as in this embodiment, to be connected to the inner column 8 rotatably about an axis in the left-right direction D2, and the position of the rotation axis moves as the inner column 8 moves. The second guide roller 26 is guided by the inner circumferential surface of the rear wall 7a of the outer column 7.

[0038] The third guide rollers 27, 27 may be configured, for example, as in this embodiment, to be disposed inside the inner column 8 and connected to the slider 10. Also, the third guide rollers 27, 27 may be configured, for example, as in this embodiment, to be connected to the slider 10 rotatably about an axis in the left-right direction D2, and the position of the rotation axis may move as the slider 10 moves.

[0039] The third guide rollers 27 are guided by the inner circumferential surface of the inner column 8. Specifically, in this embodiment, the upper third guide roller 27 is guided by the inner circumferential surface of the rear wall 8a of the inner column 8, and the lower third guide roller 27 is guided by the inner circumferential surface of the front wall 8c of the inner column 8.

[0040] 9, the cross member 9 may include, for example, an upper wall 9a, a lower wall 9b, a front wall 9c, and a rear wall 9d. And, for example, as in this embodiment, the upper wall 9a, the lower wall 9b, and the front wall 9c may be connected to the outer column 7 by fixing means (for example, welding, fastening with bolts and nuts, etc.).

[0041] As a result, the cross member 9 has a connecting portion 9e that is connected to the outer column 7, and the connecting portion 9e is composed of the ends in the left-right direction D2 of the upper wall 9a, the lower wall 9b, and the front wall 9c. Therefore, the upper end 9f of the connecting portion 9e is the upper wall 9a, and the lower end 9g of the connecting portion 9e is the lower wall 9b.

[0042] The rear wall 9d may be connected to the upper wall 9a and the lower wall 9b by, for example, a fastening means of bolts and nuts. This allows the rear wall 9d to be detachable from the upper wall 9a, the lower wall 9b, and the front wall 9c. The upper wall 9a, the lower wall 9b, and the front wall 9c are fixed walls that are fixed to the outer column 7, and the rear wall 9d is a detachable wall that is attached to and detached from the fixed walls. Therefore, by detaching the detachable wall from the fixed walls, it is possible to, for example, check the interior of the cross member 9 or adjust the internal configuration of the cross member 9.

[0043] Furthermore, the upper surface of the cross member 9 (the upper surface of the upper wall 9a) may be at the same height as the upper surface of the load receiving platform 11 located at the upper end position, for example. As a result, the upper surface of the cross member 9 is used as a transition surface between the load receiving platform 11 and the load bed floor surface 3d of the load bed 3. Note that the upper surface of the cross member 9 may be at the same height as the load bed floor surface 3d of the load bed 3, for example, or may be located slightly higher than the load bed floor surface 3d of the load bed 3, for example.

[0044] The outer column 7 includes an upper column portion 7c that is disposed above an upper end 9f of the connecting portion 9e (an end portion of the upper wall 9a of the cross member 9), and a lower column portion 7d that is disposed below the upper end 9f of the connecting portion 9e. Note that, in Fig. 9(b), the configuration disposed inside the cross member 9 is not shown.

[0045] Incidentally, for example, there are cases where the load receiving platform lifting device 4 is used when the vehicle 1 is traveling on a rough road and tilted forward / backward or left / right. For example, when the load receiving platform lifting device 4 is used when the vehicle 1 is tilted left / right (when the load receiving platform lifting device 4 is used in a state in which it is tilted left / right), there is a risk that the length by which one of the inner columns 8 is inserted into the outer column 7 will be shortened.

[0046] On the other hand, the length W1 in the vertical direction D3 of the lower column portion 7d is longer than the length W2 in the vertical direction D3 of the upper column portion 7c. This makes it possible to ensure the length of the inner column 8 inserted into the outer column 7 even when the load-receiving platform lifting device 4 is used in a state inclined to the left or right.

[0047] In addition, while the length of the lower column portion 7d in the up-down direction D3 is increased, the lower end 9g of the connecting portion 9e of the cross member 9 (specifically, the end portion of the lower wall 9b in the left-right direction D2) is disposed below the center 7j of the lower column portion 7d in the up-down direction D3. As a result, the cross member 9 supports the pair of lower column portions 7d, 7d over a wide area in the up-down direction D3, so that even when the load-receiving platform lifting device 4 is used in a state inclined left or right, the pair of lower column portions 7d, 7d can be maintained parallel to each other.

[0048] In this way, even when the load-receiving platform lifting device 4 is used in a state inclined to the left or right, the length of the inner column 8 inserted into the outer column 7 can be ensured, and moreover, the pair of lower column portions 7d, 7d can be maintained parallel. This makes it possible, for example, to prevent the inner column 8 from coming out of the outer column 7, and also makes it possible, for example, for the inner column 8 to move smoothly in the up-down direction D3 relative to the outer column 7.

[0049] Incidentally, while the length W1 of the lower column portion 7d in the up-down direction D3 is increased, the lifting unit 5 is positioned in the unused position (see FIG. 4) by the reversing mechanism 14, so that the entire outer column 7 is positioned above the bed floor surface 3d of the bed 3. Therefore, for example, while the length W1 of the lower column portion 7d in the up-down direction D3 can be increased, by positioning the lifting unit 5 in the unused position when the vehicle 1 is traveling, it is possible to prevent the outer column 7 from interfering with traveling.

[0050] 10, the outer column 7 may include, for example, a front column section 7e formed in a cylindrical shape, and a rear column section 7f formed in a cylindrical shape and connected to the rear of the front column section 7e. The front column section 7e and the rear column section 7f may each be formed in a square cylindrical shape, for example.

[0051] As a result, the outer column 7 is equipped with a front wall 7g, a rear wall 7a, a left wall 7h, and a right wall 7i. Specifically, the front wall 7g is formed by the front wall of the front column section 7e, the rear wall 7a is formed by the rear wall of the rear column section 7f, the left wall 7h is formed by the left walls of the front column section 7e and the rear column section 7f, and the right wall 7i is formed by the right walls of the front column section 7e and the rear column section 7f.

[0052] The inner column 8 is inserted into the rear column portion 7f of the outer column 7. The inner column 8 may be formed, for example, in a rectangular cylindrical shape. As a result, the inner column 8 has a front wall 8c, a rear wall 8a, a left wall 8d, and a right wall 8e.

[0053] The first guide roller 25 may be connected to the outer column 7 inside the outer column 7 so as to be rotatable about an axis in the left-right direction D2, as in this embodiment. As a result, the first guide roller 25 guides the outer peripheral surface of the front wall 8c of the inner column 8. Therefore, the first guide roller 25 is in contact with the front wall 8c of the inner column 8 opposite the rear wall 8a having the inner slit 8b.

[0054] As shown in Figs. 11 to 13, the second guide roller 26 is disposed inside the outer column 7 and above the inner column 8. The second guide roller 26 may be rotatably connected to the inner column 8 about an axis in the left-right direction D2 via a rotary connection part 17, as in this embodiment. As a result, the second guide roller 26 is guided by the inner circumferential surface of the rear wall 7a of the outer column 7. Note that the first guide roller 25, the lower sheave 22, and the cross member 9 and their interiors are not shown in Fig. 11.

[0055] The rotary connection part 17 may, for example, as in this embodiment, include a fixed plate 17a fixed to the upper end of the inner column 8, and a support plate 17b protruding upward from the fixed plate 17a and rotatably supporting the second guide roller 26. In this embodiment, the fixed plate 17a is disposed along the lateral directions D1, D2, specifically, the front-rear direction D1 and the left-right direction D2, and the support plate 17b is disposed along the up-down direction D3 and the front-rear direction D1.

[0056] Also, in this embodiment, one support plate 17b is provided, and the support plate 17b supports the center of the shaft of the second guide roller 26, but the configuration is not limited to this. For example, two support plates 17b may be provided, and the support plate 17b may support both ends of the shaft of the second guide roller 26. The inner column 8, the rotary connection part 17, and the second guide roller 26 are inserted into the outer column 7, and constitute an inner part 18 that moves in the vertical direction D3 relative to the outer column 7.

[0057] Incidentally, for example, when the loading platform lifting device 4 is used in a state in which the vehicle 1 is tilted forward / backward or left / right, the gravity of the loading platform 11 and the cargo is applied to the guide rollers 25-27, etc. In particular, when the loading platform lifting device 4 is used in a state in which it is tilted forward / backward, the gravity of the loading platform 11 and the cargo is applied to the guide rollers 25-27, etc. as a large force.

[0058] In contrast, the thickness W3 of the fixed plate 17a (specifically, the width in the up-down direction D3) is greater than the thickness W4 of the walls 8a, 8c to 8e of the inner column 8. Moreover, the thickness W5 of the support plate 17b (specifically, the width in the left-right direction D2) is greater than the thickness W4 of the walls 8a, 8c to 8e of the inner column 8.

[0059] This increases the strength of the rotary connection part 17, so that even if the load-receiving platform lifting device 4 is used in an inclined state, for example, it is possible to suppress deformation or damage of the rotary connection part 17. Although not particularly limited, it is preferable that the thickness W3 of the fixed plate 17a and the thickness W5 of the support plate 17b are each 200% or more of the thickness W4 of the walls 8a, 8c to 8e of the inner column 8.

[0060] 10, the width W6 in the left-right direction D2 where the first guide roller 25 comes into contact with the outer circumferential surface of the front wall 8c of the inner column 8 is wider than the width W7 in the left-right direction D2 of the inner slit 8b. As a result, the force applied to the inner column 8 via the first guide roller 25 is dispersed, so that even if the load-receiving platform lifting device 4 is used in an inclined state, for example, it is possible to suppress deformation of the inner column 8 so as to widen the inner slit 8b (so that the front wall 8c of the inner column 8 is curved convexly backward at the center).

[0061] Although not particularly limited, the width W6 in the left-right direction D2 where the first guide roller 25 contacts the outer peripheral surface of the front wall 8c of the inner column 8 is preferably, for example, 200% or more of the width W7 in the left-right direction D2 of the inner slit 8b. Furthermore, although not particularly limited, the width W6 in the left-right direction D2 where the first guide roller 25 contacts the outer peripheral surface of the front wall 8c of the inner column 8 is preferably, for example, 50% or more of the outer width W8 in the left-right direction D2 of the inner column 8, more preferably, for example, 60% or more of the outer width W8, and further preferably, for example, 70% or more of the outer width W8.

[0062] [1] As described above, the loading platform lifting / lowering device 4 in this embodiment is as follows: A pair of cylindrical support columns 7, 7 extending in the vertical direction D3; Inner parts 18, 18 are inserted into the support 7 and move in the up-down direction D3 relative to the support 7; A cylindrical cross member 9 extending in the lateral direction D2 and connecting the pair of pillars 7, 7 is provided. The cross member 9 includes a connecting portion 9e that is connected to the support pillar 7, The support 7 is An upper column portion 7c that is disposed above an upper end 9f of the connecting portion 9e; a lower column portion 7d disposed below an upper end 9f of the connecting portion 9e, The length W1 of the lower column portion 7d in the vertical direction D3 is longer than the length W2 of the upper column portion 7c in the vertical direction D3. This configuration is preferred.

[0063] According to this configuration, the dimension W1 in the vertical direction D3 of the lower column section 7d disposed below the upper end 9f of the connecting section 9e is larger than the dimension W2 in the vertical direction D3 of the upper column section 7c disposed above the upper end 9f of the connecting section 9e. This ensures the length of the inner section 18 inserted into the support column 7 even when the loading platform lifting device 4 is used in a state inclined to the left or right.

[0064] [2] In addition, in the loading platform lifting device 4 described above in [1], as in this embodiment, A lower end 9g of the connecting portion 9e is disposed below a center 7j of the lower column portion 7d in the up-down direction D3. This configuration is preferred.

[0065] According to this configuration, the upper end 9f of the connecting portion 9e is the upper end of the lower column portion 7d, and the lower end 9g of the connecting portion 9e is disposed below the center 7j of the lower column portion 7d in the up-down direction D3. As a result, the cross member 9 supports the pair of lower column portions 7d, 7d over a wide area in the up-down direction D3, so that the pair of lower column portions 7d, 7d can be maintained parallel even when used in a state inclined to the left or right.

[0066] [3] In addition, the loading platform lifting device 4 of the above [1] or [2] is, as in this embodiment, A load receiving platform 11 that moves in a vertical direction D3 relative to the support pillar 7, a lifting unit 5 having the support pillar 7, the inner portion 18, and the cross member 9, and a reversing mechanism 14 that reverses the lifting unit 5 about a lateral direction D2 between a use position in which the load receiving platform 11 is used and a non-use position in which the load receiving platform 11 is not used. When the lifting unit 5 is located at the use position, a portion of the support 7 is disposed below the loading platform floor surface 3d, When the lifting unit 5 is located at the unused position, the entire support 7 is disposed above the loading platform floor surface 3d. This configuration is preferred.

[0067] According to this configuration, the reversing mechanism 14 reverses the lifting unit 5 about the lateral direction D2 as an axis between a use position where the load receiving platform 11 is used and a non-use position where the load receiving platform 11 is not used. Even though the length W1 of the lower column portion 7d in the up-down direction D3 is increased, when the lifting unit 5 is in the non-use position, the entire support pillar 7 can be positioned above the load receiving platform floor surface 3d.

[0068] [4] In addition, in any one of the load-receiving platform lifting and lowering devices 4 described above in [1] to [3], as in this embodiment, The inner section 18 includes a cylindrical inner column 8 extending in the up-down direction D3. The loading platform lifting device 4 is a slider 10 that is disposed across the inside and outside of the inner column 8 and moves in a vertical direction D3 relative to the inner column 8; A load receiving platform 11 connected to the slider 10; a first guide roller 25 that is rotatably connected to the support column 7 inside the support column 7 and guides the outer circumferential surface of the inner column 8; The inner column 8 includes an inner slit 8b extending in the vertical direction D3 and into which the slider 10 is inserted, The first guide roller 25 contacts a wall 8c of the inner column 8 on the opposite side to the wall 8a having the inner slit 8b, A width W6 in the lateral direction D2 where the first guide roller 25 contacts the outer peripheral surface of the inner column 8 is wider than a width W7 in the lateral direction D2 of the inner slit 8b. This configuration is preferred.

[0069] According to this configuration, the first guide roller 25 contacts the wall 8c of the inner column 8 opposite the wall 8a having the inner slit 8b. As a result, when the load-receiving platform lifting device 4 is used in an inclined state, a large force is applied to the inner column 8 via the first guide roller 25.

[0070] Therefore, the width W6 in the lateral direction D2 where the first guide roller 25 contacts the inner column 8 is made wider than the width W7 in the lateral direction D2 of the inner slit 8b. This distributes the force applied to the inner column 8 via the first guide roller 25, making it possible to suppress deformation of the inner column 8 so as to widen the inner slit 8b.

[0071] [5] In addition, in any one of the load-receiving platform lifting and lowering devices 4 described above in [1] to [4], as in this embodiment, The inner portion 18 is A cylindrical inner column 8 extending in the vertical direction D3; A second guide roller 26 is disposed inside the support 7 and above the inner column 8 and is guided by an inner peripheral surface of the support 7; a rotation connection portion 17 that connects the second guide roller 26 to the upper end of the inner column 8, The rotary connection portion 17 is a fixed plate 17a disposed along the lateral directions D1 and D2 and fixed to the upper end of the inner column 8; a support plate 17b that protrudes upward from the fixed plate 17a and rotatably supports the second guide roller 26, Each of the thickness W3 of the fixed plate 17a and the thickness W5 of the support plate 17b is thicker than the thickness W4 of the walls 8a, 8c to 8e of the inner column 8. This configuration is preferred.

[0072] According to this configuration, when the load-receiving platform lifting device 4 is used in an inclined state, a large force is applied to the second guide roller 26, and therefore a large force is applied to the rotary connection part 17. Meanwhile, since the thickness W3 of the fixed plate 17a and the thickness W5 of the support plate 17b are each greater than the thickness W4 of the walls 8a, 8c to 8e of the inner column 8, the strength of the rotary connection part 17 can be increased.

[0073] [6] In addition, as in this embodiment, the vehicle 1 is Any one of the load receiving platform lifting devices 4 described above in [1] to [5]; The loading platform 3 on which the loading platform lifting device 4 is attached is provided. This configuration is preferred.

[0074] According to this configuration, even if the loading platform lifting device 4 is used in a state inclined to the left or right, the length of the inner portion 18 inserted into the support 7 can be ensured.

[0075] The vehicle 1 and the loading platform lifting device 4 are not limited to the configurations of the above-mentioned embodiment, and are not limited to the above-mentioned effects. Of course, the vehicle 1 and the loading platform lifting device 4 can be modified in various ways without departing from the gist of the present invention. For example, it is of course possible to arbitrarily select one or more of the configurations and methods of the various modified examples described below and adopt them in the configurations and methods of the above-mentioned embodiment.

[0076] (A) In the load-receiving-table lifting / lowering device 4 according to the above embodiment, the lower end 9g of the connecting portion 9e is arranged below the center 7j of the lower column portion 7d in the vertical direction D3. However, the load-receiving-table lifting / lowering device 4 is not limited to this arrangement. For example, the lower end 9g of the connecting portion 9e may be arranged above the center 7j of the lower column portion 7d in the vertical direction D3.

[0077] (B) Furthermore, the loading platform lifting / lowering device 4 according to the above embodiment includes an inner column 8, that is, the inner part 18 includes the inner column 8, the rotary connection part 17, and the second guide roller 26. However, the loading platform lifting / lowering device 4 is not limited to such a configuration.

[0078] For example, the loading platform lifting device 4 may not include the inner column 8, and the inner part 18 may include the slider 10 and the third guide roller 27. Specifically, the third guide roller 27 rotatably connected to the slider 10 may be guided by the inner peripheral surface of the support (outer column 7).

[0079] (C) In addition, in the load-receiving-table lifting / lowering device 4 according to the above embodiment, the width W6 in the lateral direction D2 where the first guide roller 25 contacts the outer peripheral surface of the inner column 8 is wider than the width W7 in the lateral direction D2 of the inner slit 8b. However, the load-receiving-table lifting / lowering device 4 is not limited to this configuration.

[0080] For example, the width W6 in the horizontal direction D2 where the first guide roller 25 contacts the outer peripheral surface of the inner column 8 may be the same as the width W7 in the horizontal direction D2 of the inner slit 8b. Also, for example, the width W6 in the horizontal direction D2 where the first guide roller 25 contacts the outer peripheral surface of the inner column 8 may be narrower than the width W7 in the horizontal direction D2 of the inner slit 8b.

[0081] (D) In ​​addition, in the load-receiving-table lifting / lowering device 4 according to the above embodiment, the thickness W3 of the fixed plate 17a and the thickness W5 of the support plate 17b are each configured to be thicker than the thickness W4 of the walls 8a, 8c to 8e of the inner column 8. However, the load-receiving-table lifting / lowering device 4 is not limited to such a configuration.

[0082] For example, the thickness W3 of the fixed plate 17a may be the same as the thickness W4 of the walls 8a, 8c to 8e of the inner column 8. Also, for example, the thickness W3 of the fixed plate 17a may be thinner than the thickness W4 of the walls 8a, 8c to 8e of the inner column 8.

[0083] Also, for example, the thickness W5 of the support plate 17b may be the same as the thickness W4 of the walls 8a, 8c to 8e of the inner column 8. Also, for example, the thickness W5 of the support plate 17b may be thinner than the thickness W4 of the walls 8a, 8c to 8e of the inner column 8.

[0084] (E) In addition, in the loading platform lifting / lowering device 4 according to the above embodiment, the lifting unit 5 can be moved to the use position, the non-use position, and the storage position by the reversing mechanism 14 and the rotating mechanism 15, and therefore the outer column 7 can be moved relative to the loading platform 3. However, the loading platform lifting / lowering device 4 is not limited to this configuration.

[0085] For example, the outer column 7 may be configured to be immovably fixed to the loading platform 3. Specifically, the loading platform lifting and lowering device 4 may be configured not to include the reversing mechanism 14 and the rotating mechanism 15.

[0086] Also, for example, the base portion 12 may be fixed to the loading platform 3, and the lifting unit 5 may be reversible between the use position and the non-use position. Specifically, the loading platform lifting device 4 may be provided with the reversing mechanism 14 but may not be provided with the rotating mechanism 15.

[0087] (F) In the vehicle 1 according to the above embodiment, the loading platform lifting / lowering device 4 is configured to be directly attached to the loading platform 3. However, the loading platform lifting / lowering device 4 is not limited to this configuration. For example, the loading platform lifting / lowering device 4 may be configured to be indirectly attached to the loading platform 3 by being attached to the vehicle body 2.

[0088] (G) For example, the order of execution of each process, such as operations, procedures, steps, and stages, in the methods and apparatuses shown in the claims, specifications, and drawings, can be arbitrary, as long as the result of a previous process is not used in a subsequent process. For example, even if the description uses "first," "next," etc. for convenience, it does not mean that the processes must be executed in that order. [Explanation of symbols]

[0089] 1...vehicle, 2...vehicle body, 2a...vehicle frame, 3...cargo bed, 3a...floor, 3b...side wall, 3c...gateway, 3d...cargo bed floor, 4...loading platform lifting device, 5...lifting unit, 6...mounting unit, 7...support (outer column), 7a...rear wall, 7b...support slit (outer slit), 7c...upper column part, 7d...lower column part, 7e...front column part, 7f...rear column part, 7g...front wall, 7h...left wall, 7i...right wall, 7j...center, 8...inner column, 8a...rear wall, 8b...inner slit, 8c...front wall, 8d...left wall, 8e...right wall, 9...cross member, 9a...upper wall, 9b...lower wall, 9c...front wall, 9d...rear wall, 9e...connecting portion, 9f...upper end, 9g...lower end, 10...slider, 11...load receiving platform, 11a...first plate, 11b...second plate, 12...base portion, 13...lock pin, 14...reversal mechanism, 14a...handle, 15...rotation mechanism, 16...driving source, 17...rotation connection portion, 17a...fixed plate, 17b...support plate, 18...inner portion, 21...upper sheave, 22...lower sheave, 23...fixed sheave, 24...moving sheave, 25...first guide roller, 26...second guide roller, 27...third guide roller, D1...fore-aft direction, D2...left-right direction, D3...up-down direction

Claims

1. A pair of cylindrical supports extending in the vertical direction; an inner portion that is inserted into the support and moves vertically relative to the support; A tubular cross member extending laterally and connecting the pair of pillars, The cross member includes a connecting portion that is connected to the support pillar, The support pillar is an upper column portion disposed above an upper end of the connecting portion; a lower column portion disposed below an upper end of the connecting portion, A load receiving platform lifting device, wherein the vertical length of the lower column section is longer than the vertical length of the upper column section.

2. The load-receiving platform lifting device according to claim 1 , wherein a lower end of the connecting portion is disposed lower than a center of the lower column portion in a vertical direction.

3. a load receiving platform that moves up and down relative to the support pillar; and a lifting unit having the support pillar, the inner portion, and the cross member; a reversing mechanism that reverses the lifting unit about a lateral axis between a use position in which the load receiving platform is used and a non-use position in which the load receiving platform is not used, When the lifting unit is located at the use position, a portion of the support pillar is disposed below a bed floor surface, 2. The load-receiving platform lifting device according to claim 1, wherein when the lifting unit is in the unused position, the entire support pillar is positioned above the load-receiving platform floor surface.

4. The inner portion includes a cylindrical inner column extending in a vertical direction, The loading platform lifting device is a slider that is disposed across the inside and outside of the inner column and moves in a vertical direction relative to the inner column; A load receiving platform connected to the slider; a first guide roller that is rotatably connected to the support column inside the support column and guides an outer circumferential surface of the inner column; the inner column includes an inner slit extending in a vertical direction and into which the slider is inserted, The first guide roller is in contact with a wall of the inner column opposite to a wall having the inner slit, 2. The load receiving and lifting device according to claim 1, wherein a lateral width of the first guide roller in contact with the outer peripheral surface of the inner column is wider than a lateral width of the inner slit.

5. The inner portion is a cylindrical inner column extending in the vertical direction; A second guide roller is disposed inside the support and above the inner column and is guided by an inner circumferential surface of the support; a rotation connection portion that connects the second guide roller to an upper end of the inner column, The rotary connection portion is a fixed plate disposed along the lateral direction and fixed to an upper end of the inner column; a support plate that protrudes upward from the fixed plate and rotatably supports the second guide roller, 2. The load-receiving platform lifting device according to claim 1, wherein each of the fixed plate and the support plate has a thickness greater than a thickness of a wall of the inner column.

6. A loading platform lifting device according to any one of claims 1 to 5, A vehicle comprising: a loading platform to which the loading platform lifting device is attached.

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