JP2004131005A - Load-receiving platform lifter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load-receiving platform lifter capable of fitting the widths of a link body and a load-receiving platform to that of a floor surface of a packing case while having a function serving as a rear bumper. <P>SOLUTION: A rear surface 11b of the link body 11 is formed into such a shape that an upper section is wider than a lower section gradually in the cross direction. On the lower side, a dimension which satisfies requirements as the rear bumper is maintained and, on the upper side, a dimension which meets a width W1 of the floor surface of the packing case 102 is assured. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading / unloading device for loading / unloading cargo on a truck or the like.
[0002]
[Prior art]
2. Description of the Related Art In a loading tray lifting device that lifts and lowers a loading tray by two arms forming parallel links, a member called a link body that connects the ends of the left and right arms of the vehicle body in the vehicle width direction is provided between the arm and the loading tray. Is known (for example, see Patent Document 1). In this case, by providing a flat upper surface portion on the link body extending in the vehicle width direction, the upper surface portion can be a part of the load receiving surface. Further, in a state where the loading tray is folded on the link body and the loading tray is stored, the rear part of the link body also serves as a rear bumper.
[0003]
[Patent Document 1]
JP-A-2000-108758 (pages 2 to 4, FIG. 1, FIG. 7, FIG. 14)
[0004]
[Problems to be solved by the invention]
According to laws and regulations, the left and right ends of the rear bumper must be located within a predetermined size range from the outer end of the wheel (rear wheel) to the inside in the vehicle width direction. Further, generally, the left and right ends of the floor of a packing box in a lorry are located outside the outer ends of the wheels. Therefore, in the link body which also serves as the rear bumper as described above, the width of the floor of the packing box is larger than the width of the link body in the vehicle width direction. The width of the link member is also the width of the receiving tray, and therefore, in the above-described conventional configuration, the width of the link member or the receiving tray could not be increased in accordance with the width of the floor surface of the packing box.
[0005]
In view of the above-described conventional problems, the present invention provides a loading tray lifting device capable of adjusting the width of a link body or a loading tray to the width of the floor of a packing box while having a functional portion as a rear bumper. The purpose is to provide.
[0006]
[Means for Solving the Problems]
The present invention is a pallet lifting device that is attached to the rear of a lorry and that can move the pallet up and down and store the pallet under the floor of a cargo box, and a pair of left and right arms forming a parallel link, A link body that is connected to the arm, extends in the vehicle width direction, and has a rear surface portion that is directed toward the rear of the vehicle body when the loading tray is stored, wherein the rear surface portion is wider in the vehicle width direction on the upper side than on the lower side; And a receiving platform foldably connected to the body (claim 1).
In the loading tray lifting device configured as described above, the rear surface of the link body is wider in the vehicle width direction on the upper side than on the lower side, so that the dimensions satisfying the requirements as the rear bumper on the lower side are maintained. On the other hand, it is possible to secure a dimension compatible with the width of the floor of the packing box on the upper side.
[0007]
Further, in the above-mentioned loading tray elevating device (Claim 1), the entire rear member including the rear surface portion of the link body includes a center member located at the center in the vehicle width direction, and left and right detachable with respect to the center member. It may be constituted by a side member (claim 2).
In this case, it is easy to remove and repair only the easily damaged side members or to replace them with new ones. In other words, there is no need for a troublesome operation of removing or repairing or replacing the entire rear member or the entire link body. In addition, in such a configuration in which the center member and the side member can be separated, if various side members having different widths (lengths in the vehicle width direction) are prepared, the common center member and the floor of the packing box can be provided. It can be combined with the side member selected according to the width of the surface.
[0008]
Further, in the above-mentioned loading table lifting device (Claim 2), the link body may be constituted by a front member made of light metal and a rear member made of iron-based metal (Claim 3).
In this case, the weight is reduced as compared with the case where the entire link body is made of a ferrous metal.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a side view showing a loading tray elevating device 1 in a retracted state, which is attached below a packing box 102 at a rear portion of a body 101 of a truck.
In FIG. 1, an angle-shaped mounting member 2 is vertically attached to each of both side surfaces of a chassis 104 behind a wheel (rear wheel) 103, and a slide rail 3 is horizontally mounted on the mounting member 2. Fixed. The slide rail 3 supports the movable part of the loading / unloading device 1 and guides it horizontally. The support base of the movable part is a first support plate 4 and a second support plate 5, which form an integral structure on the left and right sides of the vehicle body via a connecting pipe 6.
[0010]
2 to 5 are side views sequentially showing a process of pulling out and unfolding the loading tray lifting device 1 in the stored state of FIG.
In FIG. 2, the substantially straight lower arm 7 is rotatable within a predetermined range around a pin 8 provided at the left end, and the pin 8 is attached to a support 9 fixed to the connecting pipe 6. Have been. The right end of the lower arm 7 is connected to a link body (vertical link body) 11 via a pin 10.
[0011]
The upper arm 12, which forms a parallel link together with the lower arm 7, is rotatable within a predetermined range around a pin 13 provided at the left end, and the pin 13 is attached to a vertically long auxiliary link 14. I have. The right end of the upper arm 12 is connected to the link body 11 via a pin 15. The link body 11 is provided on its upper surface with a load receiving surface portion 11a extending in a direction (vehicle width direction) crossing each of the arms 7, 12. Note that the upper arm 12 is actually made of a pair of steel plates of the same shape provided with the second support plate 5 interposed therebetween, and a lift cylinder (not shown) is arranged between the pair of steel plates. The lift cylinder has a base end connected to a lower portion of the auxiliary link 14 and a piston tip connected to the upper arm 12, respectively, and rotates the upper arm 12 by a telescopic operation.
[0012]
The auxiliary link 14 is rotatable around a pin 16 within a predetermined range, and the pin 16 is attached to the second support plate 5. A stopper 17 made of a bolt, a nut, or the like is attached to the lower left end side of the auxiliary link 14, and the stopper 17 contacts the lower portion of the second support plate 5, so that the auxiliary link 14 can move clockwise. Rotation is limited. A short angle member 18 is welded to the upper end surface of the upper arm 12, and a stopper 19 constituted by a bolt, a nut, or the like is attached to the angle member 18. The head of the stopper 19 abuts on the second support plate 5 to prevent the upper arm 12 from rotating counterclockwise beyond the allowable rotation range.
[0013]
A hinge 21 that rotates about a pin 20 is attached to the link body 11. The hinge 21 is also connected to a load receiving platform (platform) 23 via another pin 22 and is a double hinge having two pivot points. A torsion spring or the like (not shown) is mounted between the hinge 21 and the loading tray 23 and between the hinge 21 and the link body 11, respectively. Thereby, the loading tray 23 rotates around the pin 22 until it stands up to about 90 degrees from the laid-down state (FIG. 4), and stays in the pin 20 until it is folded on the link body 11 from the standing state. It is configured to rotate about.
The receiving table 23 includes a main plate 24 and a sub plate 25. The main plate 24 and the sub plate 25 are connected to each other by a hinge 26 which is a double hinge similar to the hinge 21 described above. When the lock member (not shown) on the sub-plate 25 side engages with the lock device 24a provided on the main plate 24, the sub-plate 25 can be locked in a folded state. I have.
[0014]
An angle 27 is horizontally mounted between the left and right slide rails 3 in the vehicle width direction, and a mounting plate 28 is fixed to the angle 27. A pair of left and right piston rods of a slide cylinder 29 are mounted on the mounting plate 28. A cylinder support member 30 containing a cylinder portion (not shown) of the slide cylinder 29 is horizontally arranged in the front-rear direction of the vehicle body, and is welded to the connection pipe 6 at a position crossing the connection pipe 6. . A guide roller 31 is attached to the rear end of the cylinder support member 30. A spare tire 32 is attached to the connecting pipe 6 near the center in the vehicle width direction.
[0015]
When the slide cylinder 29 expands and contracts in accordance with the supply and discharge of hydraulic pressure, the connecting pipe 6 slides with respect to the mounting plate 28. Therefore, all members directly or indirectly supported by the connecting pipe 6 are movable members. That is, the mounting member 2, the slide rail 3, the angle 27, and the mounting plate 28 are fixed members of the loading / unloading device 1, and the remaining members including the piston rod 29 serving as a connection with the fixed member are movable. It is a side member.
[0016]
With reference to FIGS. 1 to 5, a brief description will be given of the pulling-out operation from the storage state and the elevating operation of the loading / unloading device 1 configured as described above.
First, when the slide cylinder 29 is extended from the retracted state shown in FIG. 1, the movable member of the loading tray elevating device 1 is pulled out to the rear of the vehicle body. From this state, the above-described lift cylinder is operated to rotate the upper arm 12 and the lower arm 7 in the downward direction. As a result, the link body 11 descends, and the load receiving table 23 in contact with the guide roller 31 rotates in the upright direction as shown in FIG.
Subsequently, when the operator raises the loading tray 23 by hand (FIG. 3) and further falls down rearward, the state shown in FIG. 4 is obtained. Further, the operator unfolds the folded loading tray 23 as shown by the solid line in FIG. The loading tray 23 pulled out and deployed in this manner moves up and down as shown by the rotation of the upper arm 12 and the lower arm 7. Further, by operating the lift cylinder with respect to the load receiving table 23 at the lower end, the auxiliary link 14 is slightly rotated, and the load receiving table 23 can be tilted so as to follow the landing surface.
[0017]
Next, the structure of the link body 11 will be described in detail. FIG. 6 is a view of the loading / unloading device 1 in a state of being stored under the floor of the packing box 102 (FIG. 1) as viewed from the rear of the vehicle body. In the figure, a rear surface portion 11b of the link body 11, which is directed rearward of the vehicle body, extends in the vehicle width direction and also serves as a rear bumper. Both ends of the rear surface portion 11b are cut diagonally as shown in the figure, and therefore, the upper side is wider in the vehicle width direction than the lower side. 7A and 7B are detailed views of the link body 11, in which FIG. 7A is a view from behind the vehicle body as in FIG. 6, and FIG. 7B is a view (bottom view) of the link body 11 from below. FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.
[0018]
7 and 8, a main part of the link body 11 is a front member 111 and a rear member 112 which are substantially plate-like members extending in the vehicle width direction, and are fixed to these members. 4) and a vertical portion 113 pin-connected to the receiving tray 23. The above-described load receiving surface portion 11a includes a front member 111 and a horizontal portion of the rear member 112. Further, the above-mentioned rear surface portion 11b is constituted by a vertical portion of the rear member 112. Here, since the rear member 112 also needs mechanical strength as a rear bumper, it is manufactured by processing an iron-based metal (iron, stainless steel, etc.) steel plate. In addition, the vertical portion 113 is manufactured by processing a similar steel plate to secure a predetermined mechanical strength in order to support the entire load of the load receiving table 23 and the load. On the other hand, since the front member 111 is not a part requiring particularly high mechanical strength, it is an extruded product of light metal aluminum. The fact that the front member 111 is made of aluminum contributes to reducing the weight of the entire link body 11. It goes without saying that a light metal other than aluminum may be used.
[0019]
Further, a resin cover 114 and a cushion rubber 115 are attached to both ends of the link body 11 in the vehicle width direction. The cushion rubber 115 prevents the tip of the sub-plate 25 from hitting the hinge 21 and causing damage when the load receiving table 23 is raised from the state of FIG. 4 to the state of FIG. A cushion rubber 117 for reducing impact at the time of landing is attached to the lower side of the link body 11 in FIG.
In FIG. 7, the rear member 112 includes a center member 112a located at the center in the vehicle width direction and left and right side members 112b connected to the center member 112a. The side member 112b is fastened to the center member 112a and the front member 111 by bolts 112c and the like. Therefore, the side member 112b is detachable from the center member 112a and the front member 111.
[0020]
Returning to FIG. 6, as described above, the rear surface 11 b of the link body 11 is formed to be wider in the vehicle width direction on the upper side than on the lower side, so that the width of the floor surface of the packing box 102 is on the upper side. The width of the receiving surface adjusted to W1 can be secured in the link body 11 and the receiving table 23. On the other hand, such a link body 11 satisfies the requirements legally required for the rear bumper as follows.
[0021]
That is, of the left and right ends of the rear surface portion 11b, the lower portion 11c exists inside the outer end of the wheel 103 in the vehicle width direction, and the upper portion 11d exists outside the outer end of the wheel 103 in the vehicle width direction. . The height H1 in the vertical direction of the portion existing outside the outer end of the wheel 103 is less than 100 mm, but the height H2 of the entire rear surface portion 11b is 100 mm or more. Here, in order to be a rear bumper, it must be 100 mm or more in the vertical direction, and both ends of the rear bumper are within a range of 0 to 200 mm inward from the outer end of the wheel 103 in the vehicle width direction. Must. Therefore, the portion protruding outside the outer end of the wheel 103 has a height H1 of less than 100 mm, and is not a rear bumper, and the other portions (hatched portions) other than the rear bumper are rear bumpers. Thus, it is possible to provide the link body 11 with a functional part as a legal rear bumper, and to match the width of the link body 11 and the load receiving table 23 to the width W1 of the floor surface of the packing box 102.
[0022]
Further, the link body 11 as a rear bumper is particularly susceptible to damage to the left and right side members 112b (FIG. 7), but since the side members 112b are removable, in such a case, the link members 11 are damaged. The side member 112b may be removed and repaired or replaced with a new one. That is, the troublesome work of removing and repairing or replacing the entire rear member 112 or the entire link body 11 is unnecessary. Therefore, repair and replacement are easy, and the cost for maintenance can be reduced.
In addition, the configuration in which the center member 112a and the side member 112b are separable in this manner is achieved by preparing various side members 112b having different widths (lengths in the vehicle width direction), thereby providing a common center member 112a. By assembling with the side member 112b selected according to the width of the floor of the packing box, the rear member 112 having a width dimension corresponding to various packing boxes can be easily manufactured.
[0023]
Note that the shape of both ends of the rear surface portion 11b of the link body 11 is not limited to the shape cut obliquely and linearly as in the above embodiment, but various applications of the basic form in which the upper side is wider than the lower side. Shapes are possible. FIG. 9 is a diagram showing an example. That is, as shown in the figure, the end (11c) may be raised vertically at or outside the outer end of the wheel 103, and the upper portion (11d) may be projected horizontally outside the outer end of the wheel 103.
[0024]
【The invention's effect】
The present invention configured as described above has the following effects.
According to the loading tray elevating device of the first aspect, the rear surface portion of the link body is wider in the vehicle width direction on the upper side than on the lower side, so that the dimensions satisfying the requirements as the rear bumper on the lower side are maintained. On the upper side, it is possible to secure both dimensions, that is, to secure a dimension corresponding to the width of the floor surface of the packing box. Therefore, it is possible to provide a loading tray raising / lowering device capable of adjusting the width of the link body or the loading tray to the width of the floor surface of the packing box while having a functional portion as a rear bumper.
[0025]
According to the loading tray elevating device of the second aspect, it is easy to remove or replace only the side member which is easily damaged, so that it is unnecessary to perform a troublesome work of removing and repairing or replacing the entire rear member or the entire link body. Thus, repair and replacement are easy, and the cost for maintenance can be reduced. In addition, in such a configuration in which the center member and the side member can be separated, if various side members having different widths (lengths in the vehicle width direction) are prepared, a common center member and a floor surface thereof can be provided. By combining with side members selected according to the width, rear members having width dimensions corresponding to various packing boxes can be easily manufactured.
[0026]
According to the loading stand elevating device of the third aspect, the weight can be reduced as compared with the case where the entire link body is made of a ferrous metal.
[Brief description of the drawings]
FIG. 1 is a side view showing a loading tray elevating device in a retracted state, which is attached below a packing box in a rear part of a body of a truck.
2 is a side view showing a state in which the loading / unloading device in the storage state of FIG. 1 is being pulled out and deployed.
FIG. 3 is a side view showing a state in which the loading tray is raised from the state of FIG. 2;
FIG. 4 is a side view showing a state in which the loading tray is lowered from the state shown in FIG. 3;
FIG. 5 is a side view showing a state where the receiving tray is expanded from the state of FIG. 4;
FIG. 6 is a view of the loading tray lifting device stored under the floor of the packing box as viewed from the rear of the vehicle body.
FIGS. 7A and 7B are detailed views of a link body in the loading tray elevating device, wherein FIG. 7A is a view seen from the rear of the vehicle body, and FIG. 7B is a bottom view.
FIG. 8 is a sectional view taken along line VIII-VIII in FIG.
FIG. 9 is a view showing another link body having both ends different from the link body of the loading tray elevating device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Receiving stand raising / lowering device 7 Lower arm 11 Link body 11b Rear part 12 Upper arm 23 Receiving stand 111 Front member 112 Rear member 112a Center member 112b Side member

Claims (3)

A cradle lift device attached to the rear of a lorry, which can move the cradle up and down and store the cradle under the floor of a packing box,
A pair of left and right arms forming a parallel link,
A link body that is connected to the arm, extends in the vehicle width direction, and has a rear surface portion that is directed rearward of the vehicle body during storage of the loading tray, and the rear surface portion is wider in the vehicle width direction on the upper side than on the lower side;
A loading tray lifting device, comprising: a loading tray foldably connected to the link body. The whole rear member including the rear surface part of the link body is constituted by a center member located at the center in the vehicle width direction, and left and right side members detachable from the center member. Receiving platform lifting device. 3. The lifting device according to claim 2, wherein the link body includes a front member made of a light metal and the rear member made of an iron-based metal.

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