JPH068770A - Lifting device for deck installed on dump truck - Google Patents

Abstract

PURPOSE:To ensure the downward turning of deck where the rear face of a dump body is closed in discharging bulk load in the body, in a deck lifting device installed on a dump truck. CONSTITUTION:The tips of an upper link 7 and a lower link 8 are connected to a connection member 11 pivotally mounted on a installation post 14, on which lower part a deck 16 is mounted turnably. At the rear lower part of a dump body 2 a hook 26 is arranged while at the base part of the deck 16, an engaging piece 25. In tilting the dump body 2 rearward only the post 14 and the deck 16 are turned by their own weight, thereby ensuring the downward turning of the deck 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading platform elevating device mounted on a dump truck.

[0002]

2. Description of the Related Art Conventionally, there is Japanese Patent Publication No. 62-29256 as a loading platform raising / lowering device mounted on a dump truck. This is because when the load box 3 is tilted rearward in order to discharge loose items in the load box 3, the upper link 9 is fixed in place by the hydraulic cylinder 20, but the lower link 10, the connecting piece 8,
The mounting column 12 and the load receiving table 10 are moved by their own weights, and the load receiving table 10 closing the rear surface of the load box 3 is rotated downward to discharge the loose objects in the load box 3.

[0003]

However, since there are many members that move due to their own weight and there are also many shaft support parts 7, 11, 13, and 14, resistance is large, and movement due to their own weight becomes uncertain.
There is a problem in that the downward movement of the cargo receiving tray, which closes the rear surface of the luggage box, is not smoothly performed, and the loose material in the luggage box cannot be discharged smoothly.

Therefore, an object of the present invention is to close the rear surface of the cargo box in the cargo platform raising / lowering device equipped on the dump truck by reducing the number of members that move due to its own weight when discharging loose materials in the cargo box. This is to ensure that the load receiving platform can be rotated downward.

[0005]

In order to achieve the above object, the present invention is mounted on the lower rear portion of the luggage box in a dump truck in which the luggage box is tilted rearward about a hinge at the rear end of the vehicle body. The base of the upper link and the base of the lower link are rotatably supported on the mounting bracket, and the tip of the upper link and the tip of the lower link are rotatably supported on the connecting member. The upper part is pivotally supported on the mounting column, and the rear part of the connecting member and the mounting column are provided with abutting portions which prevent the mounting column from rotating forward and can rotate backward, respectively. A cradle which is respectively held at a horizontal position is rotatably provided, and a hook which pivots in association with a rearward tilting motion of the pallet is pivotally supported at the lower end of the rear end of the pallet. When the cargo cradle is held in a horizontal position and lifted, Click not engage said, it is characterized by comprising providing a engaging piece that engages with the hook when storing the receiving platform to hold the packing box rear in a vertical position.

[0006]

When loading a load on the load receiving base, the load receiving base is held in a horizontal position, and the load receiving base is moved up and down via the upper link, the lower link, the connecting member and the mounting column. At this time, the hook and the engaging piece do not engage with each other, and the load receiving base and the mounting strut try to rotate forward, but since the contact portion of the mounting strut is in contact with the contact portion of the connecting member, the forward rotation is prevented. It does not move.

[0007] The load on the ground can be loaded into the load box by the load receiving platform that moves up and down. Next, when discharging the loose objects in the packing box, when the packing box is tilted backward, the hook rotates and the engagement between the hook and the engaging piece is released, and the upper link, the lower link, and the connecting member. Is held at a fixed position, and the mounting column and the load receiving platform rotate by their own weight around the pivotal support portion of the connecting member,
The cargo cradle that closes the rear surface of the cargo box is rotated downward,
Loose items in the packing box are discharged.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1a is a chassis frame of a dump truck, a subframe 1b is mounted on the chassis frame 1a, and the chassis frame 1a and the subframe 1b constitute a vehicle body 1. There is.

Reference numeral 2 denotes a luggage box mounted on the subframe 1b through a receiving tree 3, and the luggage box 2 can be tilted rearward about a hinge 4 at the rear end of the subframe 1b.
Reference numeral 5 denotes a load receiving platform elevating device provided at the rear of the load box 2. The load receiving platform elevating device 5 will be described below. Reference numeral 6 denotes a mounting bracket attached to the rear portion of the main girder 2a forming a part of the luggage box 2. The mounting bracket 6 includes a base portion of the upper link 7 and a lower link 8
The bases of and are rotatably supported by shafts 9 and 10, respectively.

The tip portion of the upper link 7 and the tip portion of the lower link 8 are rotatably supported by shafts 12 and 13 respectively on a vertical connecting member 11. A parallel link mechanism G is formed by the mounting bracket 6, the pair of upper and lower links 7 and 8, and the connecting member 11. The upper part of the connecting member 11 is pivotally supported by the mounting column 14, and the contact portion 11a at the rear portion of the connecting member 11 and the contact portion 14a of the mounting column 14 contact each other,
The mounting support 14 is not allowed to rotate forward, and the mounting support 14 is allowed to rotate rearward.

A load receiving pedestal 16 is rotatably supported by a shaft 17 below the mounting column 14, and the load receiving pedestal 16 is attached to the mounting column 14.
A pin 19 provided on the side surface of the load receiving table 16 and a fastening metal fitting 20 provided on the upper end of the mounting column 14 are connected between the upper part and the side surface of the load receiving table 16 and are held in a horizontal position by a holding rod 18 which is bendable.
It is held in a vertical position by a lashing device 21 consisting of and the rear surface of the luggage box 2 is closed.

The securing metal fitting 20 is a receiving metal fitting 20a fixed to the upper end of the mounting post 14, a rotating metal fitting 20b rotating in the receiving metal fitting 20a, and an operating rod 20C attached to the rotating metal fitting 20b.
At the position indicated by the solid line of the operating rod 20C, the rear is closed to fix the pin 16 and at the position indicated by the alternate long and short dash line, the rear is opened and the pin 16 is opened. An arm 22 is attached to the shaft 10 at the base of the lower link 8 and a piston rod 23a of a hydraulic cylinder 23 pivotally supported by the mounting bracket 6 is connected to the tip of the arm 22.
By the expansion and contraction operation of 3, the load receiving table 16 can be moved up and down horizontally between the solid line and the alternate long and short dash line via the parallel link mechanism G.

A power unit 24 for operating the hydraulic cylinder 23 incorporates an electric motor, a gear pump, an oil tank, a valve and the like. Next, in FIGS. 3 and 4, reference numeral 25 is a down-shaped engaging piece fixed to the shaft 17 of the base of the load receiving base 16, and 26 is swingable on a bracket 27 fixed to the rear surface of the traverse 26 forming a part of the load box 2. It is a hook that freely pivots.

Reference numeral 28 is an operating arm pivotally supported by a bracket 29 fixed to the main girder 2a in front of the hinge 4, and a roller 33 provided at the lower end of the operating arm 28 is a subframe. The guide plate 30 fixed to the frame 1b can be contacted. The upper end of the operating arm 28 is the transmission member 3
It is connected to the hook 26 with one.

Reference numeral 32 is a spring which is provided between the transmission member 31 and the main girder 2a and biases the hook 26 to the engagement piece 25 in a direction to release the engagement. As shown in FIG. 3, the relationship between the engagement piece 25 and the hook 26 is such that the hook 26 engages with the engagement piece 25 and the base of the load receiving stand 16 is in a state where the load receiving table 16 is stored in the vertical position on the rear surface of the luggage box 2 as shown in FIG. 5, and when the load receiving table 16 is rotated from the vertical position to the horizontal position as shown in FIG. 5, the engaging piece 25 moves upward, and when the load receiving table 16 moves up and down, the engaging piece 25 and the hook are hooked. It does not engage with 26.

The operation of the present invention having the above construction will be described below. When loading luggage into the luggage box 2 by the cargo receiving stand 16, first, in FIG. 1, the operating rod 20C is rotated from the solid line position to the alternate long and short dash line position to release the securing device 21 and to receive the cargo in the vertical position. The base 16 is rotated to a horizontal position, and the holding rod 18 holds the horizontal position. At this time, the engagement piece 25 fixed to the shaft 17 at the base of the load receiving table 16 is moving upward as shown in FIG. After that, when the hydraulic cylinder 23 is expanded and contracted by the power unit 24, the lower link 8 is rotated via the arm 22 and the load receiving tray 16 is in a horizontal state via the upper link 7, the connecting member 11 and the mounting column 14. Thus, the ground luggage can be loaded into the luggage box 2 by moving up and down between the solid line position and the one-dot chain line position in FIG.

At this time, as shown in FIG. 5, the hook 26 and the engaging piece 25 do not engage with each other, and as shown in FIG. The contact portion 14a of the column 14 is the contact portion 11a of the connecting member 11.
Since it is in contact with, it does not rotate forward. Next, when loading bulk goods in the packing box 2 for transportation,
Is set to the vertical position, the engaging piece 25 engages with the hook 26,
When the lashing device 21 is lashed, the loading tray 16 closes the rear surface of the luggage box 2.

Then, the bulk items are loaded into the packing box 2. When the loose pieces are transported in this state, the loose pieces do not leak from the rear surface of the packing box 2. Next, in the case of discharging the loose material in the packing box 2, if the packing box 2 is tilted backward, the operating arm 28 also rises as the packing box 2 rises, and the operating arm 28 is guided by the guide plate 30. When separated, the transmission member 31 is pulled backward by the force of the spring 32, and the hook 26 moves from the position shown by the solid line in FIG.
It rotates to the position indicated by the dotted chain line, and the engagement with the engagement piece 25 is released.

When the cargo box 2 is further raised, the upper link 7, the lower link 8 and the connecting member 11 are held in place,
The mounting column 14 and the load receiving base 16 are rotated by their own weights around the shaft 15 supporting portion of the connecting member 11, and the load receiving base 16 closing the rear surface of the load container 2 is rotated downward, so that the inside of the load container 2 is rotated. Loose items are discharged. When the packing box 2 is lowered after discharging the bulk materials,
The load receiving table 16 and the mounting columns 14 rotate forward due to their own weight as the load box 2 descends.

On the other hand, when the actuating arm 28 contacts the guide plate 30, the roller 33 of the actuating arm 28 causes the guide plate 30 to move.
In order to roll up, the operating arm 28 rotates counterclockwise, pulling the transmission member 31 forward, the hook 26 engages with the engaging piece 25, and the load receiving tray 16 is closed.

[0021]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, in a load carrier raising / lowering device equipped on a dump truck, the load carrier and the mounting column are rotated by their own weight around the shaft supporting portion of the connecting member as the load box is tilted backward. Since it is designed to move, it is possible to reduce the number of members that rotate due to its own weight when discharging loose items in the luggage box compared to conventional ones, and to rotate downward of the cargo tray that closes the rear surface of the luggage box. Can be reliably performed.

[Brief description of drawings]

FIG. 1 is a side view showing a loading / unloading state of a loading platform elevating device equipped on a dump truck.

FIG. 2 is a side view showing a rearward tilting state of the load box of the load receiving platform elevating device equipped on the dump truck.

FIG. 3 is a side view of a hook that closes the loading tray.

FIG. 4 is a rear view of the engagement piece.

FIG. 5 is a partially enlarged view showing the relationship between hooks and engagement pieces.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Car body 2 Packing box 4 Hinge 5 Lifting / lowering device for loading platform 6 Mounting bracket 7 Upper link 8 Lower link 11 Connecting member 14 Mounting column 16 Loading platform 25 Engaging piece 26 Hook

Claims (1)

[Claims] 1. In a dump truck in which a luggage box is tilted rearward about a hinge at a rear end of a vehicle body, a base of an upper link and a base of a lower link are attached to a mounting bracket attached to a lower rear part of the luggage box. Pivotally rotatably supported, the tip of the upper link and the tip of the lower link are rotatably rotatably supported on the connecting member, and the upper part of the connecting member is rotatably supported on the mounting column, and is attached to the rear portion of the connecting member. The support pillars are provided with abutting portions that do not allow the mounting support pillars to rotate forward and can rotate backward, respectively, and can rotate the cargo receiving table that is held at the vertical position and the horizontal position under the mounting support pillars, respectively. Further, a hook that pivots in association with the rearward tilting movement of the cargo box is pivotally supported on the lower end of the rear end of the cargo box, and the above-mentioned when the cargo carrier base is held in a horizontal position and moved up and down. Does not engage the hooks, holds the load carrier in a vertical position and A loading platform lifting device mounted on a dump truck provided with an engaging piece that engages with a hook when stored on the rear surface.