JP4199936B2 - Arrangement structure of hydraulic piping, etc. in the loading platform lifting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a load receiving device lifting / lowering device in which a load receiving table that can be moved up and down on a vehicle body side of a lorry or the like is stowed and stowed by a hoisting cylinder.
[0002]
[Prior art]
In general, in a load receiving platform lifting device that can be moved up and down via a pair of left and right parallel links at the rear of a vehicle body such as a lorry vehicle, a hydraulically driven device provided on the back surface of the load receiving platform after completion of loading and unloading work. A cradle is used to stand and store a load receiving stand at the rear of the packing box.
Each undulation cylinder is connected with a hydraulic pipe or a hydraulic hose for supplying and discharging hydraulic oil. This hydraulic pipe is connected from the vehicle-side hydraulic pump (not shown) to the load receiving base along the parallel link. After extending, the back surface of the cargo receiving platform is extended and connected to the undulation cylinder.
[0003]
[Problems to be solved by the invention]
However, in the above structure, since the hydraulic piping and the like are arranged in a state protruding from the back surface of the load receiving table, when the load receiving table is lowered to the ground when the load receiving table is raised and lowered, it is arranged on the back surface of the load receiving table. There is a risk that the hydraulic pipes and the like that are damaged interfere with stones or blocks on the ground and are damaged.
Therefore, the present invention provides a load receiving table lifting / lowering device that can reliably prevent damage to hydraulic piping and the like.
[0004]
[Means for Solving the Problems]
According to a first aspect of the present invention, a pair of left and right reinforcing supports capable of providing a load receiving base that can be appropriately moved up and down by driving means on the vehicle body side, providing a mounting groove on the back surface of the load receiving base, and reinforcing the load receiving base in the mounting groove. members were fixed in receiving platform lifting device in the receiving platform so that standing store in the pivoting cylinder provided in each reinforcing support member, branches into Rutotomoni lateral extending to receiving platform from the vehicle body A hydraulic pipe or hydraulic hose that can be connected to a pair of left and right undulation cylinders, wherein a part of the hydraulic pipe or hydraulic hose branched to the left and right is disposed in the mounting groove .
[0005]
Thereby, since hydraulic piping etc. do not protrude from a receiving stand, damage to hydraulic piping etc. can be prevented reliably.
[0007]
Further , it is not necessary to newly process a groove for arranging the hydraulic piping, and the structure of the load receiving table can be simplified. According to a second aspect of the present invention, the load receiving platform includes a plurality of molding blocks formed by extrusion molding, and the attachment groove is formed at the time of extrusion molding of the molding block. This eliminates the need for a separate machining step for the mounting groove, and makes it easy to manufacture the load receiving table.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a freight vehicle. The freight vehicle 1 has a cargo box 4 having a loading platform 3 on a vehicle body 2.
At the rear part of the vehicle body 2, a load receiving platform lifting / lowering device 5 for loading / unloading a load onto / from the loading platform 3 is disposed via an attachment frame 6. The load receiving platform elevating device 5 has a pair of left and right elevating frames 7 in a certain posture and a most elevated position (a chain line in FIG. 1) at which the height is substantially the same as the surface of the loading platform 3 and a most lowered position in contact with the ground (FIG. 1). It is supported via a pair of left and right parallel links 8 so that it can be moved 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 plate 11 of a rectangular plate-shaped load receiving base 10 is pivotally supported on each of the right and left elevating frames 7, and a horizontal protruding position (see FIG. 1) that is substantially horizontal with the upright retracted position (solid line in FIG. 1) and the surface of the load base 3. 1 dash-dot line).
[0009]
The base frame 11 of the load receiving platform 10 has a horizontal mode (FIG. 3a) in which the load receiving platform 10 is in the horizontal overhanging 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) that is inclined to be in an inclined protruding position (FIG. 2, one-dot chain line) are pivotally 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, a stopper for the lifting frame 7. The front portion of the switching block 12 abuts on the plate 14 and the side surface of the switching block 12 faces the stopper plate 14 when the bridge mode is set. A spring 15 is provided in the switching block 12 and is urged by the spring 15 so that the switching block 12 can be held at each mode position in the horizontal mode and the bridge mode. Reference numeral 16 denotes a cushion rubber made of an elastic material fixed to the tip of the switching block 12, and the cushion rubber 16 is attached to the stopper plate 14 when the switching block 12 tip and the stopper plate 14 come into contact with each other in the horizontal mode as shown in FIG. By abutting, the impact is mitigated. Reference numeral 17 denotes a cylindrical cushion rubber provided on rods 36 of hoisting cylinders 32 and 33, which will be described later. As shown in FIG. 3b, when the tip of the cylinder body 34 abuts against the cushion rubber 17 in the bridge mode, the switching block 12 is provided. The impact at the time of contact between the side surface and the stopper plate 14 is reduced.
[0010]
In this way, when loading / unloading the cargo 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 horizontally from the standing storage position. It can be rotated to the exit position, and the load receiving platform 10 can be raised and lowered in that state. When loading / unloading a load 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 standing storage position, and the load receiving platform 10 is moved from the standing storage position to the inclined protruding position. It can be rotated and the front part of the load receiving platform 10 can be brought into contact with the platform 18 to bridge between the loading platform 3 and the platform 18 without any step.
[0011]
As shown in FIGS. 5 and 6, the load receiving platform 10 includes a plurality of molding blocks 19 formed by extrusion molding of a light alloy material such as an aluminum alloy, and each of the adjacent molding blocks 19 includes a female connecting portion 20 and a male coupling portion. It is integrally connected on one plane by coupling with the connecting portion 21. Reference numeral 22 denotes a side cover having a U-shaped cross section provided on both left and right edges of the load receiving table 10. The side cover 22 prevents each molding block 19 from shifting in the left-right direction.
[0012]
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 adhering portion will be described below. Each molding block 19 is provided with a mounting groove 24 having a concave cross section 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 a fitting portion having a rectangular cross-section structure formed wider than the opening 25 and integrated with the bottom surface of the molding block 19. 26, and the upper portion of the fitting portion 26 is integrally coupled to the upper surface of the molding block 19 via a rib 27. A nut plate 28 is fitted to the fitting portion 26 of each mounting groove 24, and a bolt 30 inserted through the mounting hole 29 of the reinforcing support member 23 is screwed into the nut plate 28. Thus, the reinforcing support member 23 is fixed to the back surface of the load receiving platform 10.
[0013]
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 touch panel is grounded to the ground to prevent damage.
In the left and right reinforcing support members 23, raising and lowering cylinders 32 and 33 of a single-acting hydraulic cylinder for raising and lowering the load receiving base 10 are provided, respectively. As shown in FIG. 8, the hoisting cylinders 32 and 33 pivotally connect the base portion of the cylinder body 34 to a support bracket 35 fixed to the back surface of the load receiving table 10 and pivotally support the tip portion of the rod 36 to the lifting frame 7. When the hydraulic oil is supplied from the hydraulic pipe 37 connected to the cylinder body 34 to the base chamber side, the rod 36 extends to erect the load receiving platform 10.
[0014]
As shown in FIGS. 4, 8, 9 and 10, the hydraulic pipe 37 includes a main pipe 38 extending from the hydraulic pump (not shown) on the vehicle body 2 side to the base side of the load receiving table 10 along the parallel link 8; The first branch pipe 39 and the second branch pipe 40 are branched from the main pipe 38 and connected to the right and left undulation cylinders 32 and 33. At the branch portion between the main pipe 38 and the branch pipes 39 and 40, a T-shaped branch pipe 42 is fixed to a bracket 41 fixed to the side surface of the reinforcing support member 23 with a U bolt 43, and the branch The main pipe 38 is connected to a connecting portion 44 at the end of the pipe 42.
[0015]
One end of the first branch pipe 39 is connected to the connection portion 45 at the end of the branch pipe 42, and the other end is inserted into the reinforcement support member 23 through a hole 46 formed in the side surface of the reinforcement support member 23. Then, it is connected to the undulation 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 platform 10 while being inserted from the opening 25 thereof. Both ends of the second branch pipe 40 are bent vertically at positions close to the left and right reinforcing support members 23 and protruded from the opening 25, and one end is connected to the connection part 47 at the middle part of the branch pipe 42 and the other end Is inserted into the reinforcing support member 23 from the side of the reinforcing support member 23 and connected to the undulation cylinder 33. A lid 48 closes the opening 25 and prevents the second branch pipe 40 in the mounting groove 24 from coming out of the opening 25.
[0016]
As a result, most of the second branch pipes 40 arranged in the left-right direction on the back surface of the load receiving platform 10 are arranged in the mounting grooves 24 that are conventionally formed. The portion can be reduced, and damage to the second branch pipe 40 can be reliably prevented.
A lock device 49 for locking the load receiving table 10 to the rear portion of the load box 4 in the upright storage position is provided on the rear surface of the load receiving table 10 as shown in FIGS. The lock device 49 is configured to rotatably support an operation handle 51 on a lock device main body 50 fixed to one side (left side in FIG. 4) of the back surface of the cargo receiving platform 10. A rotary disk 52 that can rotate integrally with the rotary disk 52 is provided, and a swing link 53 is swingably supported on the rotary disk 52 with a phase difference of about 180 °. A base end portion of a lock member 54 having a rectangular cross section is pivotally supported at a free end of each swing link 53, and a distal end portion of each lock member 54 is a synthetic resin provided on both left and right side portions of the molding block 19. A hollow box-shaped guide member 55 made of a material is supported so as to be slidable in the left-right direction. Reference numeral 56 denotes a fixing bracket for fixing the guide member 55 to the molding block 19. The fixing bracket 56 is fixed to the molding block 19 with bolts 57 in a state where the molding block 19 is sandwiched.
[0017]
The tip portions of the left and right through the rotating disk 52 and the swing link 53 locking member 54 be retractable from left and right outer sides of the forming blocks 19 by rotating the said operating handle 51 in the direction of the arrow in FIG. 11 b at this When the stowage stand 10 is stood and stowed, the left and right lock members 54 can be engaged with the engaging portions (not shown) at the rear of the load box 4 to lock the stowage stand 10 in the stand-up stowage position. it can. At that time, the distal end portion of the lock member 54 slides inside the guide member 55 made of synthetic resin material, so that the lock operation can be performed without generating noise.
[0018]
FIGS. 12 and 13 show another embodiment of the arrangement structure of the second branch pipe. The second branch pipe 58 is inserted into the hollow portion 59 of the molding block 19 between the left and right reinforcing support members 23. In this state, it is arranged to extend in the left-right direction of the load receiving table 10, and both ends of the second branch pipe 58 are bent vertically to protrude from holes 60 drilled left and right on the back surface of the load receiving table 10, and one end is The other end is connected to the undulation cylinder 33 while being connected to the branch pipe 42.
[0019]
As a result, the second branch pipe 58 provided in the left-right direction on the back surface of the load receiving platform 10 is disposed in the hollow portion 59 of the conventional load receiving platform 10. The protruding portion can be reduced, and damage to the second branch pipe 58 can be reliably prevented.
In the present embodiment, the hydraulic piping has been described, but the hydraulic hose has the same function and effect.
Further, in the present embodiment, the parallel link type load receiving table lifting device has been described. However, a vertical lifting type load receiving table lifting device has the same effect.
[0020]
【The invention's effect】
More as in claim 1 of the present invention. Thus disposed in the mounting groove to fix the reinforcing support member to a portion of the hydraulic piping or hydraulic hoses which is branched to the left and right in the receiving platform side, the hydraulic piping And the like do not protrude from the load receiving table, and damage to the hydraulic piping or the like can be reliably prevented. Moreover, it is not necessary to process a new groove, and the structure of the load receiving table can be simplified. According to the second aspect , since the mounting groove is formed at the time of extrusion molding of the load receiving table, a process of separately processing the mounting groove is not required, and the load receiving table can be manufactured easily and easily.
[Brief description of the drawings]
FIG. 1 is an overall view of a load receiving table lifting device.
FIG. 2 is an enlarged view of a main part of FIG. 1 showing a horizontal / inclined protruding position state of the load receiving stand.
FIG. 3 is an enlarged view of a main part of FIG. 2 showing a horizontal / bridge mode state of the switching block;
4 is an AA view of FIG. 1. FIG.
FIG. 5 is an overall side view of the receiving platform.
6 is an enlarged view of a part B in FIG. 5 showing a molding block of the load receiving stand.
7 is a cross-sectional view taken along the line CC of FIG.
FIG. 8 is an enlarged view of a main part of FIG. 4 showing the undulation cylinder.
9 is a cross-sectional view taken along the line DD of 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 the locking device.
FIG. 12 is an AA view of FIG. 1 showing another embodiment.
13 is a cross-sectional view taken along the line EE of FIG.
[Explanation of symbols]
2 Car body 5 Load receiving device lifting device 10 Load receiving table 19 Molding block 23 Reinforcing support member 24 Mounting grooves 32, 33 Undulating cylinder 37 Hydraulic piping

Claims (2)

A load receiving base that can be appropriately moved up and down by driving means is provided 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 that can reinforce the load receiving base are fixed to the mounting groove, In the load receiving platform lifting device configured to stand and store the load receiving stand by the hoisting cylinder provided in each of the support members, the load receiving stand lifting device extends from the vehicle body side to the load receiving stand and branches to the left and right to be connected to a pair of left and right lifting cylinders. An arrangement structure of a hydraulic pipe or the like in a load receiving device lifting / lowering device, wherein a part of a hydraulic pipe or a hydraulic hose branched right and left is disposed in the mounting groove. The receiving platform comprises a plurality of shaped blocks which is constituted by the extrusion molding, the mounting groove, such as a hydraulic piping in the receiving platform lifting device according to claim 1, characterized by being formed during extrusion of the molding blocks Arrangement structure.

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