JPS621857B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a block body provided between the chassis frame and the cargo box so as to be able to swing back and forth, so that even if the cargo box is lowered due to an erroneous operation, the cargo box can be lowered reliably. This invention relates to a device for preventing cargo boxes from falling in dump trucks.

Generally, as shown in FIG.
By protruding the block body 03 which is pivotably supported on the chassis frame 01, the loading box 04 can be prevented from falling. Cut out a part of the gap, that is, the block 05, and insert the block body 0 in this part.
3, the height H of the block body 03 must be lower than the height h of the receiving tree 05, thereby making the block body 03 large and sufficiently strong. There is a problem that cannot be done.

The present invention provides a cargo box drop prevention device for a dump truck that solves the above problem.

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a chassis frame, a subframe 2 is mounted on the chassis frame 1, and a supporter 3 is mounted on the subframe 2, respectively. Reference numeral 4 denotes a cargo box that can be tilted around a hinge part 5 provided at the rear of the subframe 2, and when the cargo box 4 is lowered, the lower surface of the cargo box 4 joins to the upper surface of the support 3.

Between the sub-frame 2 and the cargo box 4, a cargo box lifting device 6 is interposed at the front, and a cargo box lowering prevention device 7, which will be described later, is installed at the rear near the hinge portion 5. The box fall prevention device 7 is designed to be stored in a portion of the support 3 corresponding to the rear part of the subframe 2 by cutting out a portion thereof. Next, to explain the cargo box drop prevention device 7, the base portion is joined and welded to the side surfaces of the pair of left and right sub-frames 2, 2 a little forward of the hinge portion 5, and the tip portion protrudes from the upper surface of the sub-frames 2, 2. Mounting brackets 8, 8 are provided.

A shaft 9 is rotatably installed on the mounting brackets 8, 8, and a mounting rod 10 that swings back and forth is fixed to the shaft 9 above the subframe 2.

A hollow block body 12 having a closed cross section is attached to the mounting rod 10 by a pair of upper and lower bearing pieces 11, 11 provided on the front surface, and the front surface of this block body 12 is parallel to the mounting rod 10 and
2 is designed to be able to rotate around the mounting rod 10. The width L of the block body 12 is made narrower than the width of the sub-frame 2 and smaller than the height of the tree bracket 3, and the height H of the block body 12 is made narrower than the width of the subframe 2 and the height of the tree bracket 3.
Furthermore, the length of the block body 12 is such that it can be stored in the notch of the bracket 3 on the rear upper surface of the subframe 2.

The upper surface of the block body 12 forms a contact surface 13 such that the block body 12 and the lower surface of the packing box 4 are perpendicular to each other, and the lower surface of the block body 12 forms a contact surface 13 such that the block body 12 and the lower surface of the packing box 4 are perpendicular to each other. As shown by the dashed dotted line, a rear joint surface 14 joins to the top surface of the subframe 2 when it extends rearward and upward, and a front joint surface 16 joins to the slope surface of the receiving piece 15 fixed to the top surface of the subframe 2. is formed.

Incidentally, reference numeral 17 denotes a support piece attached to the inner surface of the subframe 2, which supports the side surface of the block body 12 when the block body 12 is in the retracted state as shown in FIG.

In the present invention, with the above configuration, in the running state where the cargo box 4 is connected to the upper surface of the supporter 3, the block body 12 is in the third position.
As shown by the solid line in the figure, it is stored between the upper surface of the sub-frame 2 and the lower surface of the cargo box 4, lying so that the upper surface of the sub-frame 2 and the side surface are joined to the support piece 17.

Next, we will explain the operation of lifting the cargo box 4 to an appropriate height using the lifting device 6 and extending the block body 12 at this time. The block body 12 is rotated 90 degrees around the mounting rod 10 as shown by the dashed line in FIG.
When the block body 12 is rotated rearward about the shaft 9, the front joint surface 16 on the lower surface of the block body 12 is connected to the receiving piece 15.
In addition, the rear joint surface 14 is joined to the upper surface of the subframe 2 so that it can be reliably positioned and extended as shown by the two-dot chain line in FIGS. 1 and 3.

Thereafter, in the above state, maintenance and inspection of the hydraulic equipment between the cargo box 4 and the chassis frame 2 is performed. At this time, even if the cargo box 4 suddenly descends, the cargo box 4
can be received by the block body 12.

As described above, the present invention allows the block body to swing back and forth around the shaft and rotate around the mounting rod fixed to the shaft, so that the height H of the block body is lower than the height of the receiving tree. This allows the use of a block body that is strong in strength.

[Brief explanation of the drawing]

Figure 1 is a side view of a dump truck equipped with the device of the present invention, Figure 2 is a perspective view of the device of the present invention, Figure 3 is a side view of the device of the present invention when it is stored, and Figure 4 is the same as in Figure 3. The plan view and FIG. 5 are side views showing the conventional device. 1 is a palm frame, 3 is a tree receiver, 4 is a packing box, 8
9 is a mounting bracket, 9 is a shaft, 10 is a mounting rod, and 12 is a block body.

Claims (1)

[Claims] 1. A mounting bracket fixed to the chassis side frame, a shaft installed on the mounting bracket, a mounting rod that swings back and forth around the shaft, and a mounting rod that is installed parallel to the mounting rod and that swings around the mounting rod. It mainly consists of a block body which is pivoted so that it can rotate, and when the block body is tilted backward and extended, the lower surface of the block body is joined to the upper surface of the frame, and when the block body is retracted, the block body is attached to the upper surface of the frame. A cargo box drop prevention device for a dump truck, in which a side surface of the body can correspond to the upper surface of the frame and the lower surface of the front cargo box.