JPS596142A - Opening/closing device for side dump door of dump truck - Google Patents

Abstract

PURPOSE:To open a side dump door smoothly and widely by pivoting the one end of a bracket arm connected with two link plates on a bracket fast fixed on both side-walls in the rear part of a bed, and the other end of the arm on a side dump door arm. CONSTITUTION:A fixing base 11 provided with a bracket 12 and a step 13 is fixed on both side-walls of a bed 30. Two link plates 15a and 15b are connected by a shaft 16 to be rotatable for constructing a bracket arm 14. The end on the side of the link plate 15a is pivoted on the above-said bracket 12, while the end on the side of the link plate 15b is pivoted on the upper end part of a side dump door arm 18. The step 13 supports the end part of the link plate 15b when the bracket arm 14 is turned sideways. In this construction, when the bed 30 is operated for dumping, the side dump door arm 18 and the bracket arm 14 are turned upward round shafts 19, 16, and 17, and the supports of shafts 19 and 16 are moved upward to open a side dump door 31 smoothly and widely.

Description

[Detailed Description of the Invention] Conventionally, a dump mechanism is used to tilt a cargo box and open a sliding door.
For dump trucks that discharge materials such as earth, sand, gravel, etc., the opening/closing device for the fan door is based on the previously filed Utility Model Application No. 1983-1983.
As shown in No. 128, it had a simple structure in which the arm of the sliding door was pivoted to a bracket fixed to the upper end of both side walls of the cargo box.

Therefore, normally the sliding door can rotate backwards using the axis of the arm as a fulcrum, but if the door is loaded with earth and sand to a level higher than the height of the sliding door, or if the cargo box is tilted sharply, it may slide down. Since the upper side of the fan door was under heavy pressure due to earth and sand, it became difficult to rotate the fan door around its axis. Therefore, it was often the case that earth and sand would fall over the fan door, completely burying the fan door and making it impossible to move the dump truck forward.

There was also a danger that the center of gravity of the dump truck would shift to the rear when discharging soil, causing the front wheels to lift up.

Furthermore, with conventional fan door opening/closing devices, the opening of the fan door is narrow, so
When there are large rocks mixed in with the earth and sand, it is often impossible to remove them without removing the fan door, which reduces work efficiency. In addition, if the opening of the fan door is narrow, it is impossible to unload the earth and sand into a narrow place, which requires a large storage area.

Conventionally, therefore, the bracket was made higher and the fan door arm lengthened. However, if the brackets were made high, there was a risk that power shovel packets could be caught during loading work such as earth and sand. Furthermore, if the arm of the sliding door is made long, it is easy to break and the sliding door is difficult to operate smoothly when discharging the transported items.

One object of this invention is to ensure that the door can be opened smoothly even when the cargo box is loaded with earth, sand, gravel, etc. to a level exceeding the height of the door, or even when the box is tilted sharply by the dump mechanism. To provide a sliding door opening/closing device which opens wide and allows dirt, etc. to freely slide down.

Another object of the present invention is to make the work of transporting earth and sand more efficient and safe.

Still another object of the present invention is to provide a switchgear with a simple and durable structure that will not be damaged.

This invention relates to a swing door opening/closing device for a dump truck, in which a bracket is fixed to the upper end of both side walls at the rear of a cargo box, and two
Opening/closing of a fan door of a dump truck, characterized in that one end of each of the brackets connecting the link plates is pivotally connected to the bracket, and each other end is pivotally connected to the end of the fan door. It provides equipment.

Next, an embodiment of the present invention will be described in detail with reference to the drawings. Figures 1.1 to 4 show an embodiment of the present invention. +i
In the figure, 10 is a member of the sliding door opening/closing device, and a bracket 12 is provided on one side of a mounting base 11, and a receiver 1 is provided on the other side.
3 is provided. 14 is two link boards 15a, 15b
is a bracket arm which is rotatably connected by a shaft 16, and its end on the link plate 15a side is connected to the bracket 1 described in "2".
It is pivotally connected to the two ends of the sliding door arm 18 with a shaft 17, and is pivotally connected with a shaft 19 to the upper end of a sliding door arm 18 whose end on the link plate 15b side is curved. When the above-mentioned receiver 13 is provided, the bracket arm 1
4 is placed sideways, the end of the link plate 15b can be supported, but this support is not necessarily required.

In Fig. 2, Fig. 3, and Fig. 4, 3o indicates a loading box of a dump truck, and the above-mentioned member 10 is attached to the upper surface of each rear end of both side walls.
, 10 mounts It, 11 are each welded.

Further, the lower end of each sliding door arm 18 is welded to the upper end of the sliding door 31, respectively. 32 indicates the lock of the fan door. Fan door 31
can be opened as shown in Figure 5.

Figures 6 to 8 show other embodiments, in which the bracket arm U in the member area has two link plates 25a, 2.
5b is rotatably connected with the shaft, and the link board is:
The end on the f2!1a side is pivotally connected to the bracket n with a shaft 27,
The end of the link plate 5h side is pivotally attached to the upper end of the door arm through a shaft hole for easy attachment and detachment. In other words, the handle of the pivot part is
When the door is rotated to the position shown in the figure, the attachment/detachment port 34 of the pivot portion opens, and the door arm path can be removed together with the shaft hole at the end.

Then, the mounting bases 21 on the lower side of the brackets 22, which are added to the above-mentioned parts, are welded to the upper surfaces of the rear ends of both side walls of the cargo box, and the lower ends of the sliding door arms 4 are attached to the upper ends of the sliding doors 31. They are welded to each other. (-, if the bracket arm U is bent using the shaft hole as a fulcrum when the fan door 31 is closed, the link plate 2
The end portions of 5a and Z5b are supported on the upper side of the bracket 22. This embodiment is suitable for a small dump truck, and the sliding door 31 can be opened as shown in FIG.

According to this invention, as shown in Fig. 5 and Fig. 8, when the loading box (9) is tilted by the dump mechanism after the lock is released, the sliding door 31 receives the pressure of the sliding dirt a, etc. At the same time, the fan door arm 18.28 and the bracket arms 14, 24 are moved to the shafts 19, 29 and the shafts 16, 2.
6 and the shafts 17, 27 as fulcrums, and the shafts 19, 29 and the fulcrums of the shafts 16, 26 move upward. Therefore, the fan door 31 can be opened smoothly, and at the same time, the discharge port can be opened more widely than before.

Therefore, if earth and sand etc. are loaded above the height of the fan door,
Or, even if the cargo box is tilted sharply, dirt, etc. can freely slide down from the wide open discharge port.

Also, according to this invention, there is no possibility that the dump truck will become stuck or the front wheels will float due to the dump truck being buried by falling earth and sand.

Furthermore, even if a fairly large rock is mixed into the transported material,
Since it can fall freely without being caught by the sliding door, the transported object can be quickly discharged. Therefore, transportation work is safe and at the same time work efficiency can be improved.

Furthermore, according to the present invention, transported materials such as earth and sand can be unloaded at a higher level than ever before, so a narrow storage space can be used effectively.

Furthermore, according to the present invention, the structure of the opening/closing device is extremely simple and strong, and the fan door opens smoothly and widely when discharging earth and sand, thereby preventing damage to the bracket arm, the fan door arm, the fan door, etc. can do.

Note that the members of the swing door opening/closing device of the present invention can also be replaced with existing swing door opening/closing devices of dump trucks.

[Brief explanation of the drawing]

)・Figure 1 is a side view of the components of the sliding door opening/closing device that is an embodiment of this invention, Figure 2 is a plan view of the rear of the cargo box with the components shown in Figure 1 attached, and Figure 3 is Figure 2. 】・Figure 4 is a rear view of the packing box, Figure 5 is a diagram of the state in use, Figure 6 is a side view of another embodiment, Figure 7 is a diagram with the fan door arm removed. The side view and fang 8 show its usage state. 10... Member, 12... Bracket, 14...
・Bracket arm, ], 5a, 15b... Link plate, 16... Axis, 17... Axis, 18... Swing door arm, 19... Axis, Addition... Member, 22...・
Bracket, U...Bracket arm, 25 +1
．． 25 b... link plate, 26... shaft, 27.
...Axis, Road...Sakido arm, Four...Axis. Patent applicant Katsuyuki Taniguchi

Claims (1)

[Claims] A bracket is fixed to the upper end of both side walls at the rear of the dump truck, one end of each bracket arm connecting two link plates is pivoted to the above bracket, and the other end is attached to the arm of the fan door. A swing door opening/closing device for a dump truck, characterized in that each end is pivotally connected.