Load-receiving platform lifting device, load-receiving platform lifting device fitting method, and vehicle

Abstract

To provide a load-receiving platform lifting device which can be firmly fitted to a load-carrying platform, a load-receiving platform lifting device fitting method, and a vehicle.SOLUTION: A load-receiving platform lifting device comprises: a lifting unit having a load-receiving platform; a base part which fits the lifting unit to a load-carrying platform of a vehicle; and a lock mechanism which fixes the base part to the load-carrying platform. The lock mechanism comprises: an insertion hole formed in the base part; a pin body which is inserted in the insertion hole and a fixation hole in the load-carrying platform; a first plate which projects toward a radial direction outer side from a tip of the pin body; and an eccentric cam which is rotatably connected to a base end part of the pin body, and sandwiches the base part and the load-carrying platform between itself and the first plate. The eccentric cam rotates between a fixation attitude that the first plate approaches the eccentric cam and a fixation release attitude that the first plate is separated from the eccentric cam.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a load-receiving platform lifting / lowering device, a mounting method for the load-receiving platform lifting / lowering device, and a vehicle. [Background technology]

[0002] Patent Document 1 describes a luggage loading / unloading device that includes a lift frame provided with a table for placing luggage and a lift cylinder. The lift frame is supported so as to be rotatable about a vertical axis and can be stored inside the rear door of the loading platform.

[0003] In Patent Document 1, the position of the lift frame is fixed by a positioning lock pin, but since the positioning lock pin is not fixed sufficiently, there is a possibility that the lift frame may move unintentionally. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-153816 A Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, an object of the present invention is to provide a loading platform lifting device that can be firmly attached to a loading platform, a mounting method for the loading platform lifting device, and a vehicle. [Means for solving the problem]

[0006] The loading platform lifting device according to the present invention is a lifting unit having a load receiving platform; a base portion for attaching the lifting unit to a bed of a vehicle; a locking mechanism for fixing the base portion to the loading platform, The locking mechanism includes an insertion hole formed in the base portion, a pin body inserted into the insertion hole and a fixing hole formed in the loading platform, a first plate protruding radially outward from a tip end of the pin body, and an eccentric cam rotatably connected to a base end of the pin body and sandwiching the base portion and the loading platform between the first plate and the eccentric cam, The eccentric cam rotates between a fixed position in which the first plate approaches the eccentric cam and a released position in which the first plate moves away from the eccentric cam.

[0007] The method for mounting the loading platform lifting device according to the present invention comprises the steps of: A method for mounting the loading platform lifting device to a loading platform of a vehicle, comprising the steps of: The thickness of the loading platform is adjusted by changing the thickness of the spacer fixed around the fixing hole.

[0008] In addition, the vehicle according to the present invention is The loading platform lifting device; and a loading platform to which the loading platform lifting device is attached. [Brief description of the drawings]

[0009] [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, illustrating 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. 13 is a perspective view of the loading platform lifting device according to the embodiment, as viewed from another direction. [Figure 7] Cross-sectional view of the main part taken along line VII-VII in FIG. [Figure 8] Plan view showing insertion and fixing holes [Figure 9] Plan view of the floor showing the fixing holes [Figure 10] Perspective view of the lock pin [Figure 11] Diagram explaining the operation of the lock pin [Figure 12] Cross-sectional view showing the procedure for inserting the lock pin [Figure 13] Cross-sectional view showing the procedure for inserting the lock pin [Figure 14] Cross-sectional view showing the procedure for inserting the lock pin [Figure 15] Cross-sectional view showing the procedure for inserting the lock pin [Figure 16] Cross-sectional view showing the procedure for inserting the lock pin [Figure 17] Cross-sectional view showing the procedure for inserting the lock pin [Figure 18] 4 is a cross-sectional view of an insertion hole and a fixing hole according to another embodiment; [Figure 19] FIG. 13 is a front view of a lock pin according to another embodiment; [Figure 20] FIG. 13 is a front view of a lock pin according to another embodiment; [Figure 21] FIG. 13 is a front view of a lock pin according to another embodiment; [Figure 22] FIG. 11 is a cross-sectional view of a lock mechanism according to another embodiment. [Figure 23] FIG. 13 is a perspective view of a loading platform lifting device according to another embodiment; [Figure 24] Perspective view of the cover DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] Hereinafter, an embodiment of the vehicle and the loading platform lifting / lowering device will be described with reference to Figures 1 to 17. 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] The lifting unit 5 may, for example, as in this embodiment, include a pair of cylindrical 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 relative to the outer columns 7, and a cylindrical cross member 9 extending in the left-right direction D2 and connecting the pair of outer columns 7, 7.

[0020] In this embodiment, the outer column 7 has an outer slit 7b extending in the up-down direction D3 in its rear wall 7a, and the inner column 8 has an inner slit 8b extending in the up-down direction D3 in its rear wall 8a. The outer slit 7b and the inner slit 8b communicate with each other in the front-rear direction D1.

[0021] 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.

[0022] 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 moves in the vertical direction D3 relative to the inner column 8, the slider 10 and the inner column 8 move integrally in the vertical direction D3 relative to the outer column 7, or the slider 10 moves in the vertical direction D3 relative to the inner column 8 and the outer column 7.

[0023] The load receiving platform 11 may include, for example, a main plate 11a rotatably connected to the slider 10, and a sub-plate 11b rotatably connected to the main 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 main plate 11a and the sub-plate 11b are unfolded and move along the front-rear direction D1, and a storage position (see Figure 3) in which the main plate 11a and the sub-plate 11b are folded and move along the up-down direction D3.

[0024] 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 locking mechanism 13 (see Figures 6 and 7) 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.

[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] 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).

[0027] 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.

[0028] 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).

[0029] 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.

[0030] As shown in FIG. 6, the base portion 12 may include a pair of inversion support portions 21, 21 and a connecting plate portion 22 connecting the pair of inversion support portions 21, 21.

[0031] The pair of reversible support parts 21, 21 respectively support the pair of outer columns 7, 7 in a reversible manner. The reversible support part 21 includes a bottom plate 211, a reinforcing plate 212, and a pair of support plates 213, 213. The lower surface of the bottom plate 211 is placed on the loading platform floor surface 3d of the floor part 3a.

[0032] The reinforcing plate 212 is made of an L-shaped plate member in a side view, and includes a horizontal plate portion 212a extending in the front-rear direction D1 and a vertical plate portion 212b extending in the up-down direction D3. The horizontal plate portion 212a is fixed to the upper surface of the bottom plate 211 by welding or the like. The vertical plate portion 212b extends upward from the rear end of the horizontal plate portion 212a. The pair of support plates 213, 213 are each made of a plate member formed into a substantially triangular shape. The pair of support plates 213, 213 are fixed to the upper surface of the horizontal plate portion 212a and the front surface of the vertical plate portion 212b by welding or the like, with a gap between them in the left-right direction D2.

[0033] The loading platform lifting device 4 is provided with a locking mechanism 13 that fixes the base portion 12 to the floor portion 3a of the loading platform 3 when the lifting unit 5 is in the unused position and the stored position. In this specification, a case where the locking mechanism 13 fixes the base portion 12 to the floor portion 3a when the lifting unit 5 is in the unused position will be described in detail.

[0034] The locking mechanism 13 is provided on each of the left and right reversing support parts 21, as shown in Fig. 6. The locking mechanism 13 includes an insertion hole 31 provided on each reversing support part 21 and a locking pin 34 to be inserted into the insertion hole 31, as shown in Fig. 7.

[0035] 8 is a plan view showing the insertion hole 31 and a fixing hole 41 described later. In Fig. 7 and Fig. 8, the insertion hole 31 has an upper hole 32 provided in the horizontal plate portion 212a of the reinforcing plate 212 and a lower hole 33 provided in the bottom plate 211 below the upper hole 32.

[0036] The upper hole 32 is formed between the pair of left and right support plates 213, penetrating the horizontal plate portion 212a in the thickness direction (up-down direction D3). The upper hole 32 also extends in the longitudinal direction of the horizontal plate portion 212a (front-rear direction D1 in FIG. 8). Hereinafter, the longitudinal direction in which the upper hole 32 extends is also referred to as the "upper hole direction." The upper hole 32 includes an arc hole portion 32a, a short rectangular hole portion 32b, and a long rectangular hole portion 32c.

[0037] The short rectangular hole portion 32b extends from the arc hole portion 32a to one side in the upper hole direction (the front side in FIG. 8). The long rectangular hole portion 32c extends from the arc hole portion 32a to the other side in the upper hole direction (the rear side in FIG. 8). The long rectangular hole portion 32c is formed longer in the upper hole direction than the short rectangular hole portion 32b. Note that the upper hole 32 is not limited to this embodiment, and for example, the short rectangular hole portion 32b and the long rectangular hole portion 32c may be formed in the reverse order of FIG. 8.

[0038] The lower hole 33 is a substantially circular hole, and is formed penetrating the bottom plate 211 in the thickness direction (vertical direction D3). The lower hole 33 includes a small arc hole portion 33a, a large arc hole portion 33b, and a step portion 33c connecting the small arc hole portion 33a and the large arc hole portion 33b. In a plan view, the small arc hole portion 33a has a radius longer than the short rectangular hole portion 32b of the upper hole 32 and shorter than the long rectangular hole portion 32c of the upper hole 32. In a plan view, the large arc hole portion 33b has a radius longer than the long rectangular hole portion 32c of the upper hole 32. The small arc hole portion 33a and the large arc hole portion 33b are formed concentrically with the arc hole portion 32a of the upper hole 32. The lower hole 33 is formed to a size that allows the entire upper hole 32 to be placed within the lower hole 33 in a plan view. The pilot hole 33 is not limited to this embodiment. For example, the small arc-shaped hole portion 33a and the large arc-shaped hole portion 33b may be formed in the reversed left-right direction of FIG.

[0039] When the lifting unit 5 is in the unused position, the insertion hole 31 is formed to overlap in the up-down direction D3 with a fixing hole 41 formed in the floor portion 3a of the loading platform 3. At this time, the arc hole portion 32a of the upper hole 32 and the lower hole 33 are arranged concentrically with the arc hole portion 41a (described later) of the fixing hole 41. As a result, the entire fixing hole 41 is arranged in the lower hole 33 of the insertion hole 31 in a plan view.

[0040] FIG. 9 is a plan view of the floor portion 3a showing the fixing holes 41. In FIG. 9, the floor portion 3a is provided with a total of four fixing holes 41. Each fixing hole 41 is formed penetrating the thickness direction (vertical direction D3) of the floor portion 3a. Two fixing holes 41 spaced apart from each other in the left-right direction D2 are formed at positions overlapping with the respective insertion holes 31 of a pair of inversion support parts 21 arranged on the left and right in the vertical direction D3 when the lifting unit 5 is in the unused position. In addition, each of the two left and right fixing holes 41 is formed as a hole extending in a direction (left-right direction D2) perpendicular to the upper hole direction (front-rear direction D1) of the upper hole 32 when the lifting unit 5 is in the unused position.

[0041] The remaining two fixing holes 41, which are spaced apart from each other in the front-rear direction D1, are formed at positions overlapping in the up-down direction D3 with the insertion holes 31 of the pair of inversion support parts 21 arranged at the front and rear when the lifting unit 5 is in the storage position. Each of the two front and rear fixing holes 41 is formed as a hole extending in a direction (front-rear direction D1) perpendicular to the upper hole direction (left-right direction D2) of the upper hole 32 when the lifting unit 5 is in the storage position. Hereinafter, the direction perpendicular to the upper hole direction is also referred to as the "fixing hole direction".

[0042] In this specification, in conjunction with the explanation of the lock mechanism 13, the two fixing holes 41 located on the left and right sides below each insertion hole 31 when the lifting unit 5 is in the unused position will be explained in detail. In Fig. 7 and Fig. 8, the fixing hole 41 has an arc hole portion 41a, a short rectangular hole portion 41b, and an elongated rectangular hole portion 41c. The short rectangular hole portion 41b extends from the arc hole portion 41a to one side in the fixing hole direction (the right side in Fig. 8). The elongated rectangular hole portion 41c extends from the arc hole portion 41a to the other side in the fixing hole direction (the left side in Fig. 8).

[0043] The radius of curvature of the arc hole portion 41a is approximately the same as the radius of curvature of the arc hole portion 32a of the upper hole 32. The length of the short rectangular hole portion 41b in the fixing hole direction is approximately the same as the length of the short rectangular hole portion 32b in the upper hole 32 in the upper hole direction. The long rectangular hole portion 41c is formed longer in the fixing hole direction than the short rectangular hole portion 41b. The length of the long rectangular hole portion 41c in the fixing hole direction is approximately the same as the length of the long rectangular hole portion 32c in the upper hole 32 in the upper hole direction. Note that the fixing hole 41 is not limited to this embodiment, and for example, the short rectangular hole portion 41b and the long rectangular hole portion 41c may be formed in the reversed left and right of FIG. 8.

[0044] 10 is a perspective view of the lock pin 34. The lock pin 34 is inserted into the insertion hole 31 (upper hole 32 and lower hole 33) and the fixing hole 41, which are overlapped in the vertical direction D3. The lock pin 34 includes a pin body 35, a first plate 36, an eccentric cam 37, a second plate 38, and a collar 39.

[0045] The pin body 35 includes a cylindrical portion 35a and a flange portion 35b. The cylindrical portion 35a is inserted into the arc-shaped hole portion 32a of the upper hole 32 and the arc-shaped hole portion 41a of the fixing hole 41, and the radius of the outer circumferential surface of the cylindrical portion 35a is slightly smaller than the radius of curvature of both the arc-shaped hole portions 32a, 41a. The length of the cylindrical portion 35a in the vertical direction D3 is set to a length that passes through the insertion hole 31 and the fixing hole 41.

[0046] The flange portion 35b protrudes from the outer circumferential surface of the lower portion of the cylindrical portion 35a. The outer circumferential surface of the flange portion 35b is formed concentrically with the outer circumferential surface of the cylindrical portion 35a.

[0047] The first plate 36 includes an annular portion 36a, a short piece portion 36b, and a long piece portion 36c. The inner diameter of the annular portion 36a is slightly larger than the outer diameter of the cylindrical portion 35a of the pin body 35, and is smaller than the outer diameter of the flange portion 35b of the pin body 35. The annular portion 36a is fitted into the cylindrical portion 35a from above and abuts against the upper surface of the flange portion 35b. This allows the first plate 36 to be supported from below by the flange portion 35b of the pin body 35. As a result, the first plate 36 can be prevented from falling off the pin body 35.

[0048] The annular portion 36a may be welded to the flange portion 35b, whereby the first plate 36 can be prevented from rotating with respect to the pin body 35.

[0049] The short piece portion 36b extends radially outward from the annular portion 36a. The short piece portion 36b is formed to a size that allows it to be inserted into the short rectangular hole portion 32b of the upper hole 32 and the short rectangular hole portion 41b of the fixing hole 41. The long piece portion 36c extends radially outward from the annular portion 36a on the opposite side to the short piece portion 36b. The long piece portion 36c is longer than the short piece portion 36b. The long piece portion 36c is formed to a size that allows it to be inserted into the long rectangular hole portion 32c of the upper hole 32 and the long rectangular hole portion 41c of the fixing hole 41.

[0050] The second plate 38 is inserted into the pin body 35. The second plate 38 is an annular member, and the inner diameter is slightly larger than the outer diameter of the cylindrical portion 35a of the pin body 35. In addition, the radius of the outer circumferential surface of the second plate 38 is larger than the radius of curvature of the arc hole portion 32a of the upper hole 32.

[0051] The collar 39 is inserted into the pin body 35. The collar 39 includes a cylindrical portion 39a and a flange portion 39b. The inner diameter of the cylindrical portion 39a is slightly larger than the outer diameter of the columnar portion 35a of the pin body 35. The outer diameter of the cylindrical portion 39a is approximately the same as the outer diameter of the flange portion 35b of the pin body 35. The radius of the outer peripheral surface of the flange portion 39b is approximately the same as the radius of the outer peripheral surface of the second plate 38.

[0052] The eccentric cam 37 is rotatably connected to the upper part of the pin body 35. The eccentric cam 37 is provided with an operating lever 37a that is operated by an operator. The cam surface of the eccentric cam 37 abuts against the upper surface of the second plate 38.

[0053] FIG. 11 is a diagram for explaining the operation of the lock pin 34. The eccentric cam 37 is rotatable between, for example, a fixed position (position shown by a solid line in FIG. 11) in which the operating lever 37a is disposed substantially perpendicular to the pin body 35, and a release position (position shown by a two-dot chain line in FIG. 11) in which the operating lever 37a is disposed substantially linearly with the pin body 35. When the eccentric cam 37 is in the fixed position, the first plate 36 is separated from the lower surface of the floor portion 3a by a gap S1. When the eccentric cam 37 is in the release position, the first plate 36 is separated from the lower surface of the floor portion 3a by a gap S2. The gap S2 is larger than the gap S1. That is, the eccentric cam 37 rotates between a fixed position in which the first plate 36 is brought closer to the eccentric cam 37 and closer to the lower surface of the floor portion 3a, and a release position in which the first plate 36 is moved away from the eccentric cam 37 and away from the lower surface of the floor portion 3a. In addition, the gap S1 may be configured to be substantially zero, in which case the lock pin 34 is in a state in which the first plate 36 and the flange portion 39b of the collar 39 sandwich the inversion support portion 21 and the floor portion 3a in the vertical direction D3.

[0054] It is preferable that the operating lever 37a is formed so that at least the tip portion extends obliquely upward when the eccentric cam 37 is in the fixed position. The operating lever 37a is formed, for example, in a dogleg shape in a side view. This makes it easier for an operator to push in and lift the operating lever 37a. A belt (handle) may be attached to the tip of the operating lever 37a. Also, a belt (handle) may be attached to the eccentric cam 37 instead of the operating lever 37a.

[0055] The lock mechanism 13 may also include a lever restricting portion 37b (see FIG. 7) that is disposed above the operating lever 37a when the eccentric cam 37 is in the fixed position. The lever restricting portion 37b is, for example, a rod-shaped member that is spanned between the pair of left and right support plates 213. Both ends of the lever restricting portion 37b are inserted into through holes formed in the pair of left and right support plates 213. The lever restricting portion 37b is attached after the eccentric cam 37 is rotated from the release position to the fixed position, and restricts the eccentric cam 37 from rotating from the fixed position to the release position. This makes it possible to prevent the lock pin 34 from loosening due to vibration during travel or lifting operation, causing the load-receiving platform lifting device 4 to move.

[0056] Hereinafter, a procedure for inserting the lock pin 34 into the insertion hole 31 and the fixing hole 41 that overlap in the up-down direction D3 will be described with reference to FIGS. 12 to 17 and other figures.

[0057] 12, the worker places the lock pin 34 above the upper hole 32 of the insertion hole 31. Specifically, the worker places the annular portion 36a, the short piece portion 36b, and the long piece portion 36c of the first plate 36 above the arc hole portion 32a, the short rectangular hole portion 32b, and the long rectangular hole portion 32c of the upper hole 32, respectively.

[0058] From the state shown in Fig. 12, the worker moves the lock pin 34 downward. As a result, as shown in Fig. 13, the annular portion 36a, the short piece portion 36b, and the long piece portion 36c of the first plate 36 pass through the arc hole portion 32a, the short rectangular hole portion 32b, and the long rectangular hole portion 32c of the upper hole 32, respectively, and are inserted into the lower hole 33. When the first plate 36 is inserted into the lower hole 33, the lower surfaces of the short piece portion 36b and the long piece portion 36c come into contact with the bed floor surface 3d of the floor portion 3a, thereby restricting the downward movement of the lock pin 34. In this state, the flange portion 35b of the pin body 35 is inserted into the arc hole portion 41a of the fixing hole 41.

[0059] From the state shown in FIG. 13, the operator grasps the operating lever 37a and rotates the lock pin 34 horizontally by 90° around the pin body 35. At that time, the lock pin 34 is rotated so that the long piece portion 36c moves to the front side of the paper surface of FIG. 13. That is, the operator rotates the lock pin 34 clockwise in FIG. 8. The counterclockwise rotation of the lock pin 34 is restricted by the step portion 33c of the lower hole 33. By rotating the lock pin 34 horizontally by 90°, the annular portion 36a, the short piece portion 36b, and the long piece portion 36c of the first plate 36 are respectively positioned above the arc hole portion 41a, the short rectangular hole portion 41b, and the long rectangular hole portion 41c of the fixing hole 41, as shown in FIG. 14.

[0060] From the state shown in Fig. 14, the worker moves the lock pin 34 downward. As a result, the annular portion 36a, the short piece portion 36b, and the long piece portion 36c of the first plate 36 are inserted into the arc hole portion 41a, the short rectangular hole portion 41b, and the long rectangular hole portion 41c of the fixing hole 41, respectively. Then, as shown in Fig. 15, when the lower surface of the flange portion 39b of the collar 39 abuts against the upper surface of the horizontal plate portion 212a, the downward movement of the lock pin 34 is restricted. In addition, the first plate 36 passes through the fixing hole 41 and protrudes below the floor portion 3a.

[0061] From the state shown in Fig. 15, the worker grasps the operating lever 37a and rotates the lock pin 34 further 90° in the horizontal direction around the pin body 35. That is, the worker rotates the lock pin 34 from the state shown in Fig. 15 so that the long piece portion 36c moves to the front side of the floor portion 3a. As a result, as shown in Fig. 16, the upper surface of the first plate 36 is disposed opposite the lower surface of the floor portion 3a, and therefore the upward movement of the lock pin 34 is restricted while it is inserted into the insertion hole 31 and the fixing hole 41.

[0062] From the state shown in Fig. 16, the operator grips the operating lever 37a and rotates the eccentric cam 37 by about 90° to the fixed position as shown in Fig. 17. This brings the first plate 36 closer to the lower surface of the floor 3a. As a result, the gap between the first plate 36 and the lower surface of the floor 3a can be reduced, and the lock pin 34 can be firmly fixed.

[0063] Next, the worker attaches the above-mentioned lever restricting portion 37b above the operating lever 37a in the state shown in Fig. 17. This restricts the rotation of the eccentric cam 37, making it possible to prevent the lock pin 34 from becoming loose.

[0064] As described above, the lock mechanism 13 can disable the lifting unit 5 in the unused position from being rotated to the storage position by the rotation mechanism 15. The procedure for inserting the lock pin 34 when disabling the lifting unit 5 in the storage position from being rotated to the unused position by the rotation mechanism 15 is the same as the procedure described above. Moreover, the lifting unit 5 can be made to rotate by the rotation mechanism 15 by reversing the procedure described above. In this embodiment, the direction in which the upper hole 32 of the insertion hole 31 extends (upper hole direction) and the direction in which the fixing hole 41 extends (fixing hole direction) are perpendicular to each other, but the present invention is not limited to this. The upper hole direction and the fixing hole direction may be parallel, and the upper hole 32 and the fixing hole 41 may completely overlap in the vertical direction D3. In this case, the worker may insert the first plate 36 of the lock pin 34 into the upper hole 32 and the fixing hole 41 at the same time and pass them through, then rotate the lock pin 34 by 90° in the horizontal direction, and further rotate the eccentric cam 37 to fix it. The direction in which the lock pin 34 is rotated may be either clockwise or counterclockwise.

[0065] [1] As described above, the loading platform lifting / lowering device 4 in this embodiment is as follows: a lifting unit 5 having a loading platform 11; A base portion 12 for attaching the lifting unit 5 to the bed 3 of the vehicle 1; A lock mechanism 13 for fixing the base portion 12 to the loading platform 3, The locking mechanism 13 includes an insertion hole 31 formed in the base portion 12, a pin body 35 inserted into the insertion hole 31 and a fixing hole 41 formed in the loading platform 3, a first plate 36 protruding radially outward from a tip end (in this embodiment, a lower part) of the pin body 35, and an eccentric cam 37 rotatably connected to a base end (in this embodiment, an upper part) of the pin body 35 and sandwiching the base portion 12 and the loading platform 3 between the first plate 36 and the pin body 35. The eccentric cam 37 rotates between a fixed position in which the first plate 36 approaches the eccentric cam 37 and a released position in which the first plate 36 moves away from the eccentric cam 37. This configuration is preferred.

[0066] With this configuration, the gap between the first plate 36 and the loading platform 3 can be reduced and the lock pin 34 can be firmly fixed, so that the loading platform lifting device 4 can be firmly attached to the loading platform 3.

[0067] [2] In addition, in the loading platform lifting device 4 described above in [1], as in this embodiment, a moving mechanism (in this embodiment, a rotating mechanism) 15 that moves the base portion 12 between a first position (in this embodiment, a position where the lifting unit 5 is not used) and a second position (in this embodiment, a storage position of the lifting unit 5) on the floor portion 3a of the platform 3; The fixing holes 41 are formed at positions overlapping with the insertion holes 31 in the up-down direction D3 when the base portion 12 is in the first position and the second position, The eccentric cam 37 faces an upper surface of the base portion 12, and the first plate 36 faces a lower surface of the floor portion 3a. This configuration is preferred.

[0068] With this configuration, the base portion can be appropriately fixed to the floor portion 3a at the first position or the second position.

[0069] [3] In addition, in the loading platform lifting device 4 described in [2] above, as in this embodiment, The eccentric cam 37 is provided with an operating lever 37a that is operated by an operator. The operating lever 37a is formed so that at least a tip portion thereof extends obliquely upward when the eccentric cam 37 is in the fixed position. This configuration is preferred.

[0070] With this configuration, an operator can easily press and lift the operating lever 37a by gripping the tip portion.

[0071] [4] In addition, in the loading platform lifting device 4 described in [3] above, as in this embodiment, The lock mechanism 13 includes a lever restriction portion 37b that is disposed above the operating lever 37a when the eccentric cam 37 is in the fixed position, The lever regulating portion 37b regulates the eccentric cam 37 from rotating from the fixed position to the released position. This configuration is preferred.

[0072] According to this configuration, the lever regulating portion 37b regulates the upward movement of the operating lever 37a, thereby preventing the lock pin 34 from loosening due to vibration during travel or lifting operations, and preventing the loading platform lifting device 4 from moving.

[0073] [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 pin body 35 has a protrusion (in this embodiment, a flange portion) 35b on the outer peripheral surface of the tip portion (in this embodiment, the outer peripheral surface of the lower portion), The protrusion 35b supports the first plate 36 in a direction toward the base end (the upper portion in this embodiment) of the pin body 35. This configuration is preferred.

[0074] According to this configuration, the first plate 36 can be prevented from falling off the pin body 35.

[0075] [6] The vehicle 1 further includes 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.

[0076] According to this configuration, the loading platform lifting device 4 can be firmly attached to the loading platform 3.

[0077] 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.

[0078] (A) The loading platform lifting device 4 according to the above embodiment includes a rotation mechanism 15 that moves the base 12 between a first position and a second position on the floor 3a of the loading platform 3, the fixing holes 41 are formed at positions that overlap the insertion holes 31 in the up-down direction D3 when the base 12 is in the first position and the second position, the eccentric cam 37 faces the upper surface of the base 12, and the first plate 36 faces the lower surface of the floor 3a. However, the loading platform lifting device 4 is not limited to this configuration. For example, the base 12 may be fixed at one position.

[0079] Furthermore, the loading platform lifting device 4 may be configured not to include the rotation mechanism 15, and the lifting unit 5 may be detachable together with the base portion 12. When the lifting unit 5 is used, the base portion 12 may be fixed to the first position, and after the lifting unit 5 is used, the base portion 12 may be removed from the first position and fixed to the second position.

[0080] Also, the eccentric cam 37 may be configured to face the lower surface of the floor portion 3a, and the first plate 36 may be configured to face the upper surface of the base portion 12. That is, the lock pin 34 may be inserted into the fixing hole 41 of the floor portion 3a from below.

[0081] (B) In the load-receiving-platform lifting / lowering device 4 according to the above embodiment, the eccentric cam 37 is provided with an operating lever 37a operated by an operator, and the operating lever 37a is configured so that at least the tip portion extends diagonally upward when the eccentric cam 37 is in a fixed position. However, the load-receiving-platform lifting / lowering device 4 is not limited to this configuration. For example, the operating lever 37a may be configured so that it extends horizontally when the eccentric cam 37 is in a fixed position. Also, the operating lever 37a may be configured so that the entire lever extends diagonally upward.

[0082] (C) In the loading platform lifting / lowering device 4 according to the above embodiment, the locking mechanism 13 is configured to include a lever restricting portion 37b disposed above the operating lever 37a when the eccentric cam 37 is in the fixed position, and the lever restricting portion 37b restricts the eccentric cam 37 from rotating from the fixed position to the released position. However, the loading platform lifting / lowering device 4 is not limited to this configuration. For example, the locking mechanism 13 may be configured to include a fixing pin that penetrates the eccentric cam 37 and the pin body 35 when the eccentric cam 37 is in the fixed position, and the fixing pin restricts the eccentric cam 37 from rotating from the fixed position to the released position.

[0083] Additionally, the eccentric cam 37 may be rotated by an electric motor or other actuator.

[0084] (D) In ​​the load receiving platform lifting device 4 according to the above embodiment, the pin body 35 has a flange portion 35b on its lower outer peripheral surface, and the flange portion 35b supports the first plate 36 in a direction toward the upper portion of the pin body 35. However, the load receiving platform lifting device 4 is not limited to this configuration. The pin body 35 may not have the flange portion 35b, and the first plate 36 may be fixed to the pin body 35 by welding or the like. Also, the first plate 36 may be formed integrally with the pin body 35.

[0085] In addition, to prevent the first plate from rotating relative to the pin body , the outer peripheral surface of the pin body and the inner peripheral surface of the annular portion a may be threaded.

[0086] (E) In the load receiving platform lifting device 4 according to the above embodiment, the lock pin 34 is configured to include the second plate 38 and the collar 39. However, the load receiving platform lifting device 4 is not limited to this configuration. For example, the lock pin 34 does not have to include the second plate 38 and the collar 39. In other words, the lock pin 34 may be configured so that the cam surface of the eccentric cam 37 directly abuts against the upper surface of the reinforcing plate 212 (horizontal plate portion 212a) of the reversing support portion 21.

[0087] (F) The locking mechanism 13 may also include a spacer 42 fixed around the fixing hole 41 as shown in FIG. 18. The spacer 42 may be fixed to the underside of the floor 3a as shown in FIG. 18. When a reinforcing material is provided on the underside of the floor 3a, the spacer 42 is disposed away from the reinforcing material. With this configuration, the thickness around the fixing hole 41 is changed by the spacer 42, so that a common locking pin 34 can be used even when the thickness of the floor 3a differs from vehicle to vehicle. In other words, it is not necessary to adjust the locking pin 34 according to the thickness of the floor 3a.

[0088] (G) As an installation method for the loading platform lifting device 4, the thickness of the loading platform 3 may be adjusted by changing the thickness of the spacer 42 fixed around the fixing hole 41. By adjusting the thickness of the loading platform 3 by changing the thickness of the spacer 42, it becomes unnecessary to adjust the lock pin 34 according to the manufacturing error of the loading platform 3, and therefore the installation work for the loading platform lifting device 4 is simplified.

[0089] (H) As shown in Fig. 19, the lock pin 34 may include a third plate 38a disposed below the second plate 38, and a disc spring 38b disposed between the second plate 38 and the third plate 38a. By providing the disc spring 38b, it is possible to accommodate errors in the thickness of the floor portion 3a.

[0090] (I) As shown in Fig. 20, the lock pin 34 may have a bolt structure at the bottom of the pin body 35. The first plate 36 is slidably inserted into the pin body 35. A double nut 35c is screwed into the bottom of the pin body 35. This allows the distance between the eccentric cam 37 and the first plate 36 to be adjusted according to the thickness of the floor portion 3a.

[0091] (J) As shown in Fig. 21, the lock pin 34 may have a bolt structure at the top of the pin body 35. The eccentric cam 37 is inserted into the pin body 35. A double nut 35d is screwed into the top of the pin body 35. This makes it possible to adjust the distance between the eccentric cam 37 and the first plate 36 according to the thickness of the floor portion 3a.

[0092] (K) In the load-receiving platform lifting device 4, the locking mechanism 13 may be configured to include a cover 43 fixed around the fixing hole 41 and covering the tip of the pin body 35 and the first plate 36 from below, as shown in Fig. 22. This configuration can prevent sand or mud kicked up by the tire from getting on the locking pin 34, thereby preventing damage or deformation of the locking pin 34. Here, damage or deformation of the locking pin 34 refers to, for example, rust caused by water, or damage caused by flying stones or gravel, etc.

[0093] 23, it is preferable that a cover 43 is provided for each of the multiple fixing holes 41. This makes it possible to prevent sand or mud kicked up by the tire from entering the cargo bed 3 through a fixing hole 41 into which a lock pin 34 is not inserted.

[0094] 24, the cover 43 has a cylindrical shape having a bottom 43a. The cover 43 of the present embodiment has a rectangular cylindrical shape having the bottom 43a, and can also be said to have a box shape with an open top.

[0095] The cover 43 has a tube portion 43b whose lower end is closed by a bottom portion 43a. The tube portion 43b is not limited to a rectangular tube and may be, for example, a cylinder, etc., as long as it has a shape that covers the lock pin 34. The height of the tube portion 43b is such that the tip of the pin body 35 does not come into contact with the bottom portion 43a when the lock pin 34 is inserted into the fixing hole 41. The size of the tube portion 43b is such that the rotating first plate 36 does not come into contact with it.

[0096] The cover 43 may include a mounting portion 43c formed at an upper end of the cylindrical portion 43b. The mounting portion 43c protrudes outward from the upper end of the cylindrical portion 43b. The mounting portion 43c is used to fix the cover 43. The mounting portion 43c may include a plurality of mounting holes 43d. The mounting holes 43d are holes that penetrate the mounting portion 43c in the up-down direction D3, and a bolt (not shown) is inserted through the mounting hole 43d.

[0097] The cover 43 is attached to the floor 3a of the loading platform 3. The cover 43 may be attached directly to the floor 3a, or may be attached to the floor 3a via a spacer 42 as shown in FIG. 22. The spacer 42 has bolt holes (not shown) formed at positions corresponding to the mounting holes 43d of the mounting portion 43c. When the cover 43 is attached directly to the floor 3a, the mounting portion 43c may be omitted. In this case, the upper end of the tubular portion 43b may be fixed to the floor 43b by welding or the like.

[0098] It is preferable that a drainage hole 43e is formed in the bottom 43a. The drainage hole 43e penetrates the bottom 43a in the up-down direction D3. By providing the drainage hole 43e in the bottom 43a, rainwater or the like that has entered the cover 43 through the fixing hole 41 can be discharged from the drainage hole 43e. The drainage hole 43e may not be formed if there is no risk of rainwater or the like entering, but it is preferable that at least one drainage hole 43e is formed. In addition, although not particularly limited, the drainage hole 43e may be formed in each of the four corners of the bottom 43a.

[0099] (L) In addition, in the load-receiving platform lifting device 4 according to the above embodiment, the base portion 12 is fixed to the floor portion 3a of the load-receiving platform 3. However, the load-receiving platform lifting device 4 is not limited to this configuration. For example, the load-receiving platform lifting device 4 may be configured such that the base portion 12 is fixed to the side wall 3b or gate 3c of the load-receiving platform 3. In this case, the fixing hole 41 is formed so as to penetrate horizontally through the side wall 3b or gate 3c.

[0100] (M) In addition, in the loading platform lifting device 4 according to the above embodiment, the lifting unit 5 is configured to be of a vertical lifting type. However, the loading platform lifting device 4 is not limited to such a configuration. For example, the lifting unit 5 may be configured to be of a link type (parallel link type). [Explanation of symbols]

[0101] Reference Signs List 1...vehicle, 2...vehicle body, 2a...vehicle frame, 3...loading platform, 3a...floor, 3b...side wall, 3c...gateway, 3d...loading platform floor, 4...loading platform lifting device, 5...lifting unit, 6...mounting unit, 7...outer column, 7a...rear wall, 7b...outer slit, 8...inner column, 8a...rear wall, 8b...inner slit, 9...cross member, 10...slider, 11...loading platform, 11a...main plate rate, 11b...subplate, 12...base portion, 13...lock mechanism, 14...reversal mechanism, 14a...handle, 15...rotation mechanism, 21...reversal support portion, 22...connecting plate portion, 31...insertion hole, 32...upper hole, 32a...arc hole portion, 32b...short rectangular hole portion, 32c...long rectangular hole portion, 33...lower hole, 33a...small arc hole portion, 33b...large arc hole portion, 33c...step portion, 34...lock pin, 35 ...pin body, 35a...cylindrical portion, 35b...flange portion, 35c...double nut, 35d...double nut, 36...first plate, 36a...annular portion, 36b...short piece portion, 36c...long piece portion, 37...eccentric cam, 37a...operating lever, 37b...lever regulating portion, 38...second plate, 38a...third plate, 38b...disc spring, 39...collar, 39a...cylindrical portion, 39b...flange portion, 41... Fixing hole, 41a...arc hole, 41b...short rectangular hole, 41c...long rectangular hole, 42...spacer, 43...cover, 43a...bottom, 43b...tubular portion, 43c...mounting portion, 43d...mounting hole, 43e...drain hole, 211...bottom plate, 212...reinforcing plate, 212a...horizontal plate portion, 212b...vertical plate portion, 213...support plate, D1...front-rear direction, D2...left-right direction, D3...up-down direction, S1...gap, S2...gap

Claims

1. a lifting unit having a load receiving platform; a base portion for attaching the lifting unit to a bed of a vehicle; a locking mechanism for fixing the base portion to the loading platform, The locking mechanism includes an insertion hole formed in the base portion, a pin body inserted into the insertion hole and a fixing hole formed in the loading platform, a first plate protruding radially outward from a tip end of the pin body, and an eccentric cam rotatably connected to a base end of the pin body and sandwiching the base portion and the loading platform between the first plate and the eccentric cam, The eccentric cam rotates between a fixed position in which the first plate is brought closer to the eccentric cam and a released position in which the first plate is moved away from the eccentric cam.

2. a moving mechanism that moves the base portion between a first position and a second position on a floor portion of the loading platform; the fixing holes are formed at positions that overlap with the insertion holes in the vertical direction when the base portion is in the first position and the second position, 2. The platform lifting device according to claim 1, wherein the eccentric cam faces an upper surface of the base portion, and the first plate faces a lower surface of the floor portion.

3. The eccentric cam includes an operating lever that is operated by an operator, 3. The load-receiving platform lifting device according to claim 2, wherein the operating lever is formed so that at least a tip portion thereof extends obliquely upward when the eccentric cam is in the fixed position.

4. the lock mechanism includes a lever restriction portion that is disposed above the operating lever when the eccentric cam is in the fixed position, The platform lifting device according to claim 3 , wherein the lever restricting portion restricts the eccentric cam from rotating from the fixed position to the released position.

5. The pin body has a protrusion on an outer peripheral surface of a tip portion, The platform lifting device according to claim 1 , wherein the protrusion supports the first plate in a direction toward the base end of the pin body.

6. The load-receiving platform lifting device according to claim 1 , wherein the locking mechanism includes a spacer fixed around the fixing hole.

7. 2. The load-receiving platform lifting device according to claim 1, wherein the locking mechanism comprises a cover fixed around the fixing hole and covering the tip of the pin body and the first plate from below.

8. 8. The load-receiving platform lifting device according to claim 7, wherein the cover is tubular and has a bottom, and a drain hole is formed in the bottom.

9. A method for mounting the loading platform lifting device according to claim 1 to a loading platform of a vehicle, comprising the steps of: A method for installing a loading platform lifting device, comprising changing the thickness of a spacer fixed around the fixing hole to adjust the thickness of the loading platform.

10. A loading platform lifting device according to any one of claims 1 to 8, A vehicle comprising: a loading platform to which the loading platform lifting device is attached.

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