JP2002254974A - Arrangement structure of hydraulic piping in cargo receive base lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage to hydraulic piping connected to cylinders for rising and falling in a cargo receive base lifting device for letting a cargo receive base rise, fall, and turn by a pair of right and left cylinders for rising and falling provided on a rear surface of the cargo receive base. SOLUTION: A second branched piping 40 extending in the direction of width of the cargo receive base 10 and connected to the cylinders 33 for rising and falling is arranged in a mounting groove 24 formed on the rear surface of the cargo receive base 10 between right and left reinforcing support members 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading / unloading device for lifting and lowering a loading / unloading pedestal provided on a vehicle body of a truck or the like by means of an up / down cylinder.

[0002]

2. Description of the Related Art Generally, in a loading / unloading device which is provided at a rear portion of a vehicle such as a lorry via a pair of left and right parallel links so as to be able to be lifted and lowered, a loading / unloading operation is performed on the underside of the loading / unloading tray. The loading table is raised and stored at the rear of the packing box by the provided hydraulically driven undulating cylinder. A hydraulic pipe or a hydraulic hose for supplying and discharging hydraulic oil is connected to each of the undulating cylinders, and the hydraulic pipe and the like are connected from a hydraulic pump (not shown) on the vehicle side to a load receiving base along a parallel link. After the extension, the back surface of the loading tray is extended and connected to the undulating cylinder.

[0003]

However, in the above-mentioned structure, since the hydraulic piping and the like are disposed so as to protrude from the back surface of the receiving table, the receiving table is lowered to the lowest position when the receiving table is moved up and down to make contact with the ground. Occasionally, there is a danger that the hydraulic pipes and the like disposed on the back surface of the receiving table interfere with stones and blocks on the ground and are damaged. Therefore, the present invention provides a lifting / lowering device for a loading tray that can reliably prevent damage to a hydraulic pipe or the like.

[0004]

According to claim 1 of the present invention,
Providing a loading tray that can be raised and lowered by appropriate driving means on the vehicle body side,
In a loading / unloading device for raising and lowering a loading table with an up / down cylinder provided on the back surface of the loading table, a hydraulic pipe or a hydraulic hose extending from the vehicle body side to the loading table side and connectable to the up / down cylinder. Is arranged inside the receiving table.

[0005] Since the hydraulic piping and the like do not protrude from the receiving table, damage to the hydraulic piping and the like can be reliably prevented. According to claim 2, a loading tray lifting device is provided on the vehicle body side, which can be raised and lowered by a driving means as appropriate, and the loading tray is raised and stored by a pair of left and right hoisting cylinders provided on the back surface of the loading tray. A hydraulic pipe or a hydraulic hose extending from the vehicle body side to the load receiving side and branching left and right to be connected to a pair of left and right hoisting cylinders, wherein the hydraulic pipe or the hydraulic hose is branched left and right on the load receiving side. It is characterized in that a part is disposed inside the receiving table.

[0006] Thus, the hydraulic piping and the like do not protrude from the loading table, so that damage to the hydraulic piping and the like can be reliably prevented. According to a third aspect of the present invention, a load receiving platform is provided on the vehicle body side that can be moved up and down by a drive means as appropriate, a mounting groove is provided on the back surface of the load receiving platform, and a pair of left and right reinforcing support members capable of reinforcing the load receiving platform are fixed to the mounting groove. And, in a loading table lifting device configured to store the loading table upright with the undulating cylinders provided in each of the reinforcing support members, a pair of right and left extending from the vehicle body side to the loading table side and branching left and right. A hydraulic pipe or a hydraulic hose that can be connected to the undulating cylinder,
A part of a hydraulic pipe or a hydraulic hose branched right and left is provided in the mounting groove.

Accordingly, it is not necessary to newly form a groove for arranging the hydraulic piping, and the structure of the receiving table can be simplified. According to a fourth aspect of the present invention, the load receiving table comprises a plurality of molding blocks formed by extrusion molding, and the mounting groove is formed at the time of extrusion molding of the molding block. This eliminates the need for a step of separately processing the mounting groove, and makes it possible to easily and easily manufacture the loading tray.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a lorry,
The truck 1 has a cargo box 4 having a carrier 3 on a body 2. At the rear part of the vehicle body 2, a loading tray lifting device 5 for loading and unloading cargo on the loading platform 3 is provided via a mounting frame 6. The loading tray raising / lowering device 5 has a pair of left and right lifting frames 7 which are at the same height as the surface of the loading platform 3 while maintaining a constant attitude (a dashed line in FIG. 1) and a lowermost position where the ground contact the ground (FIG. 1). (A two-dot chain line) so as to be able to move up and down. Between each of the parallel links 8 and the mounting frame 6,
An elevating cylinder 9 is provided as a driving means for driving the elevating frame 7 up and down. Further, a base frame 11 of a rectangular plate-shaped loading tray 10 is pivotally supported by each of the left and right lifting frames 7, and a vertically extended position (FIG. 1 solid line) and a horizontal extending position (FIG. (Dotted line).

The base frame 11 of the loading tray 10 has a horizontal mode (FIG. 3a) for setting the loading tray 10 to a horizontal overhang position (solid line in FIG. 2) as shown in FIGS. A pair of left and right switching blocks 12 that can be selectively switched to a bridge mode (FIG. 3B) in which the LCD is tilted downward to a tilted extension position (dotted line in FIG. 2) is rotatably supported. An operation lever 13 for rotating the switching block 12 is connected and fixed between the left and right switching blocks 12. When the switching block 12 is set to the horizontal mode by the operation lever 13, the stopper of the elevating frame 7 is stopped. The tip of the switching block 12 abuts on the plate 14, and the side surface of the switching block 12 faces the stopper plate 14 in the bridge mode. Reference numeral 15 denotes a spring provided on the switching block 12, which is biased by the spring 15 so that the switching block 12 can be held in each of the horizontal mode and the bridge mode. Reference numeral 16 denotes a cushion rubber made of an elastic material fixed to the front end of the switching block 12. As shown in FIG. 3A, the cushion rubber 16 is attached to the stopper plate 14 when the front end of the switching block 12 contacts the stopper plate 14 in the horizontal mode. The contact reduces the impact. Reference numeral 17 denotes a cylindrical cushion rubber provided on rods 36 of the undulating cylinders 32 and 33, which will be described later. As shown in FIG. 3B, when the leading end of the cylinder body 34 comes into contact with the cushion rubber 17 in the bridge mode, the switching block 12 is formed. Side and stopper plate 1
The shock at the time of abutment with No. 4 is reduced.

When the load is carried in and out between the loading platform 3 and the ground, the switching block 12 is switched to the horizontal mode while the loading platform 10 is in the standing storage position, and the loading platform 10 is moved to the upright storage position. From above to the horizontal overhang position, and in that state, the loading tray 10 can be raised and lowered. When loading and unloading cargo between the platform 18 lower than the loading platform 3 and the loading platform 3, the switching block 12 is switched to the bridge mode at the upright storage position, and
By rotating the loading tray 10 from the standing storage position to the inclined overhanging position, the leading end of the loading tray 10 is brought into contact with the platform 18 to bridge the loading platform 3 and the platform 18 without any step.

As shown in FIGS. 5 and 6, the receiving table 10 comprises a plurality of molding blocks 19 formed by extrusion molding of a light alloy material such as an aluminum alloy. 20 and the male connecting portion 21 are integrally connected on one plane. Reference numerals 22 denote side covers having a U-shaped cross section provided on both right and left side edges of the load receiving table 10. The side covers 22 prevent each molded block 19 from shifting in the left and right direction.

A pair of left and right hollow reinforcing support members 23 for reinforcing the load receiving table 10 are fixed to the back surface of the load receiving table 10. The structure of the fixing portion will be described below. In each of the molding blocks 19, a mounting groove 24 having a concave cross section is formed over the entire length in the longitudinal direction during extrusion molding. As shown in FIG. 6, the mounting groove 24 has an opening 25 opened on the back surface of the molding block 19 and the opening 2.
5, and has a fitting portion 26 having a rectangular cross-sectional structure integral with the bottom surface of the molding block 19, and the upper portion of the fitting portion 26 is integrally connected to the upper surface of the molding block 19 via a rib 27. Have been. A nut plate 28 is fitted into the fitting portion 26 of each of the mounting grooves 24, and a bolt 30 inserted into the mounting hole 29 of the reinforcing support member 23 is screwed into the nut plate 28. Thereby, the reinforcing support member 23 is fixed to the back surface of the loading table 10.

A cover 31 made of a light alloy material such as an aluminum alloy having a U-shaped cross section is fixed to the bottom surface of the reinforcing support member 23 as shown in FIG. The bottom surface of the support member 23 is prevented from being damaged by contact with the ground. The left and right reinforcing support members 23 are provided with single-action hydraulic cylinder raising and lowering cylinders 32 and 33 for raising and lowering the load receiving table 10, respectively. As shown in FIG. 8, the undulating cylinders 32 and 33 pivotally connect the base of the cylinder body 34 to a support bracket 35 fixed to the back surface of the load receiving pedestal 10, and pivotally support the tip of a rod 36 to the lifting frame 7. Connected to the cylinder body 34
When hydraulic oil is supplied from the hydraulic pipe 37 connected to the base chamber side to the base chamber side, the rod 36 is extended to erect the loading stand 10.

The hydraulic pipe 37 is a main pipe extending from a hydraulic pump (not shown) on the vehicle body 2 side to the base side of the loading table 10 along a parallel link 8 as shown in FIGS. 4, 8, 9 and 10. And a first branch pipe 39 and a second branch pipe 40 branched from the main pipe 38 and connected to the left and right undulating cylinders 32 and 33. The main pipe 38
The reinforcing support member 2 is provided at the branch between the branch pipes 39 and 40.
3, a T-shaped branch pipe 42 is fixed to a bracket 41 fixed to the side surface of the bracket 3 with U bolts 43.
The main pipe 38 is connected to a connection portion 44 at the end.

The first branch pipe 39 has one end connected to a connection portion 45 at the end of the branch pipe 42 and the other end formed through a hole 46 formed in a side surface of the reinforcement support member 23. And is connected to the undulating cylinder 32. The second branch pipe 40 is disposed in the mounting groove 24 of the molding block 19 between the left and right reinforcing support members 23 so as to extend in the left-right direction of the load receiving table 10 while being inserted from the opening 25 thereof. The two ends of the second branch pipe 40 are bent vertically at positions close to the left and right reinforcing support members 23 and protrude from the opening 25, and one end is connected to the connection part 47 in the middle part of the branch pipe 42, and the other end. Are inserted into the reinforcing support member 23 from the side of the reinforcing support member 23 and
3 is connected. Reference numeral 48 denotes a lid for closing the opening 25, which prevents the second branch pipe 40 in the mounting groove 24 from falling out of the opening 25.

As a result, most of the second branch pipe 40 extending along the left-right direction on the back surface of the load receiving table 10 is disposed in the mounting groove 24 formed conventionally. The protrusion on the back side can be reduced, and the second
The branch pipe 40 can be reliably prevented from being damaged. As shown in FIGS. 4 and 11, a lock device 49 for locking the load receiving table 10 to the rear portion of the load box 4 at the upright storage position is provided on the back surface of the load receiving table 10. The lock device 49
The operation handle 51 is rotatably supported by a lock device main body 50 fixed to one side (the left side in FIG. 4) of the back surface of the loading tray 10, and rotates integrally with the operation handle 51 in the lock device main body 50. The rotating disk 52 is provided with a phase difference of about 180 °.
3 is swingably supported. Each swing link 53
The base end of a lock member 54 having a rectangular cross section is supported at the free end thereof, and the distal end of each lock member 54 has a hollow box shape made of a synthetic resin material provided on the left and right sides of the molding block 19. Are supported so as to be slidable in the left-right direction. Reference numeral 56 denotes a fixing member for fixing the guide member 55 to the forming block 19. The fixing member 56 is fixed to the forming block 19 by bolts 57 while holding the forming block 19.

Now, the operation handle 51 is moved to the position shown in FIG.
The tip of the left and right lock member 54 can be made to protrude and retract from the left and right outer surfaces of the molding block 19 via the turntable 52 and the swing link 53 by rotating in the direction of the arrow. Left and right lock members 54
The front end can be engaged with a locking portion (not shown) at the rear of the packing box 4 to lock the loading table 10 at the upright storage position. At this time, the distal end of the lock member 54 slides in the guide member 55 made of a synthetic resin material, so that the lock operation can be performed without generating noise.

FIGS. 12 and 13 show another embodiment of the arrangement of the second branch pipe. The second branch pipe 58 is provided between the left and right reinforcing support members 23 in the hollow portion 5 of the molding block 19.
The second branch pipe 58 is bent vertically at both ends thereof so as to be inserted into the inside of the load receiving table 10 so as to extend in the left-right direction. And one end is connected to the branch pipe 42,
The other end is connected to the undulating cylinder 33.

As a result, the second branch pipe 58 extending in the left-right direction on the back surface of the load receiving table 10 is disposed in the hollow portion 59 of the load receiving table 10 which has been conventionally formed. The number of projecting portions on the back surface 10 can be reduced, and damage to the second branch pipe 58 can be reliably prevented. In this embodiment, the hydraulic piping has been described, but a hydraulic hose has the same operation and effect. Further, in this embodiment, the description has been given of the parallel-link-type loading tray elevating device. However, the vertical lifting-type loading tray elevating device has the same operation and effect.

[0020]

As described above, according to the first and second aspects of the present invention, a part of the hydraulic pipe or the hydraulic hose which can be connected to the hoisting cylinder is disposed inside the load receiving table. The piping and the like do not protrude downward from the back surface of the loading tray, and it is possible to reliably prevent the hydraulic piping and the like from being damaged by interference with the ground when the loading tray is moved up and down. In claim 3,
A part of the hydraulic piping or the hydraulic hose branched to the left and right on the load receiving side is arranged in the mounting groove for fixing the reinforcing support member, so there is no need to process a new groove. Can be simplified. According to the fourth aspect, since the mounting groove is formed at the time of extrusion molding of the loading table, a step of separately processing the mounting groove is not required, and the loading table can be easily and easily manufactured.

[Brief description of the drawings]

FIG. 1 is an overall view of a loading tray elevating device.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2 showing a horizontal / bridge mode state of a switching block.

FIG. 4 is an AA diagram of FIG. 1;

FIG. 5 is an overall side view of the receiving table.

FIG. 6 is an enlarged view of a portion B of FIG. 5 showing a forming block of the receiving table.

FIG. 7 is a sectional view taken along line CC of FIG. 4;

FIG. 8 is an enlarged view of a main part of FIG. 4 showing an undulating cylinder.

FIG. 9 is a sectional view taken along line DD of FIG. 8;

FIG. 10 is an enlarged view of a main part of FIG. 9;

FIG. 11 is an enlarged view of a main part of FIG. 4 showing a lock device.

FIG. 12 is an AA diagram of FIG. 1 showing another embodiment.

FIG. 13 is a sectional view taken along the line EE of FIG. 12;

[Explanation of symbols]

 2 Vehicle body 5 Loading table lifting device 10 Loading table 19 Molding block 23 Reinforcement support member 24 Mounting groove 32, 33 Undulating cylinder 37 Hydraulic piping

Claims (4)

[Claims] 1. A loading tray lifting device in which a loading tray which can be raised and lowered by a drive means as appropriate is provided on a vehicle body side, and the loading tray is set up and stored by an up-and-down cylinder provided on a back surface of the loading tray. A part of a hydraulic pipe or a hydraulic hose that extends from the vehicle body side to the load receiving side and can be connected to the undulating cylinder is disposed inside the load receiving table, and a hydraulic pipe or the like is disposed in the load receiving table elevating device. . 2. A loading / unloading device which is provided on the vehicle body side and can be raised and lowered by a drive means as appropriate, and wherein the loading / unloading platform is stored upright by a pair of left and right hoisting cylinders provided on the back surface of the loading platform. A hydraulic pipe or a hydraulic hose extending from the vehicle body side to the load receiving side and branching left and right to be connected to a pair of left and right undulating cylinders; A structure for disposing a hydraulic pipe or the like in a loading / unloading device, wherein a part thereof is provided inside the loading / receiving platform. 3. A load receiving stand which can be raised and lowered by a drive means as appropriate on the vehicle body side, a mounting groove is provided on the back surface of the load receiving base, and a pair of left and right reinforcing support members capable of reinforcing the load receiving base are fixed to the mounting groove. And, in a loading table lifting device configured to store the loading table upright with the undulating cylinders provided in each of the reinforcing support members, a pair of right and left extending from the vehicle body side to the loading table side and branching left and right. A hydraulic pipe or a hydraulic hose that can be connected to the undulating cylinder, wherein a part of the hydraulic pipe or the hydraulic hose branched to the left and right is disposed in the mounting groove, and the hydraulic pipe and the like in the loading stand elevating device. Arrangement structure. 4. The lifting / lowering device according to claim 3, wherein the loading tray comprises a plurality of molding blocks formed by extrusion molding, and the mounting groove is formed at the time of extrusion molding of the molding block. Structure of hydraulic piping etc.