JPH06211093A - Rear bumper device for truck or the like - Google Patents

Abstract

PURPOSE:To prevent a rear bumper from being damaged by its contact with another object and some interference with work from occurring while a dump carrying platform is inclining, a truck is getting on/off a ferry or running on a poor road, the carrying platform is being thrown in a hopper inside a factory or the like. CONSTITUTION:This rear bumper device for truck or the like is provided with a bumper stay 1 supported horizontally and at a prescribed position by plural arms which rotate forward from downwards to both sides of a chassis rear part with at least one of the plural arms formed as a triangular arm 2, and a rotating lock means 4 formed from the triangular arm 2 through a lock arm 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear bumper device for preventing a crash of a rear-mounted truck such as a dump truck or a specially-equipped heavy-duty truck when a rear-end truck crashes into it.

[0002]

2. Description of the Related Art There are conventional bumper bumpers fixed to a rear chassis, or an arm that pivots up and down from a stay fixed to the chassis to a rear part and a rear bumper attached thereto. Recently, the criteria for mounting the rear bumper on large vehicles, specially-equipped trucks, etc. has been revised, and the ground clearance of the bumper should be 550 mm within 700 mm.
Within a distance of 600mm to 350mm from the rear edge of the loading platform.

Therefore, in the fixed type and the conventional movable type, the rear bumper comes into contact with other objects, for example, when the dump truck is tilted, when a ferry is getting on and off, when traveling on a bad road or when the truck is loaded into a hopper in a factory. , It will be damaged or will interfere with work.

In view of the above situation, the inventor of the present invention has previously developed a rear bumper device for a truck or the like as disclosed in Japanese Patent Application No. 4-330782. Its characteristic is that the bumper stay is supported almost horizontally and at a predetermined position by a plurality of arms that rotate from below to the front, with respect to both sides of the chassis rear,
At least one of the plurality of arms is provided with a pin hole for locking to support the pin, and at the same time, a driving source such as a cylinder is used to rotate the arm and pull out and insert the pin for locking.

[0005]

In the above structure, the arm for supporting the rear bumper is locked or unlocked by inserting / removing the pin into / from the pin hole. The present invention is further improved in usability by further studying it and adopting other means other than pin insertion / removal, and utilizing the mechanism of the dump bed conventionally provided for the means for the lock. The structure can be simplified.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a bumper stay 1 is supported substantially horizontally and at a predetermined position by a plurality of arms pivoting from the lower side to the front side with respect to both sides of a rear portion of a chassis. At least one of them is a triangular arm 2, and a rotation lock means 4 is provided from the triangular arm 2 via a lock arm 3.

The rotation lock means 4 may be one which can be manually locked by using a spring or a torsion bar, or the lock arm 3 may be locked by a driving means such as a cylinder, or a lock arm. 3 may be connected to a rear gate opening / closing lock mechanism that has been conventionally provided, or the lock arm 3 may be connected to the dump loading platform 13.

[0008]

When the bumper stay 1 supported by a plurality of arms supports the rear bumper to the rear of the vehicle body during normal traveling, the lock arm 3 protruding from one corner of the triangular arm is provided with a rotation lock means 4 by a cylinder or the like. Can be fixed and maintained stable. Also, when the dump truck is tilted, or when a large truck is getting on or off the ferry,
When traveling on a rough road or the like, the arm is rotated to pull the rear bumper to the side of the vehicle body to support the rear bumper, but it is also possible to fix the rear bumper by the rotation lock means 4 at this time.

When the rotation lock means 4 connects the lock arm 3 to the rear gate opening / closing lock mechanism, the rear gate opening / closing lock mechanism is turned ON / OFF when the dump truck 13 is tilted.
Then, the rear bumper device is also turned on and off at the same time.

Further, the rotation lock means 4 is constituted by the lock arm 3
With the structure in which the dump truck is connected to the dump truck 13, the lock of the rear bumper device is turned on and off as the dump truck is tilted.
You can

[0011]

1 is a side view of a rear bumper device according to a first embodiment of the present invention. The bumper stay 1 which horizontally supports the rear bumper 5 at the rear is supported by the rear arm 6 and the front triangular arm 2 on the vehicle body 10 side by the mounting plate 9. Since the triangular arm 2 is supported by one side of the triangle, a parallel link is formed with the rear arm 6. The triangular arm 2 can be replaced with an L shape, a fan shape or the like, and these are referred to as a triangular arm in the present invention. A lock arm 3 is provided so as to project from a corner of the triangular arm 2 to provide a rotation lock means 4. The rotation lock means 4 operates the lock arm 3 with the cylinder 8.

For this purpose, the lock arm 3 is connected to the sub-frame 7 having one end fixed to the sub-frame of the vehicle body, and the cylinder 8 whose base is fixed to the main frame is connected to the intermediate part of the sub-frame 7. As a result, the solid line in FIG. 1 is in the locked state and the two-dot chain line arm is rotated to bring the rear bumper closer to the vehicle body and held in the lock-off state. A cylinder 8 may be used as a drive source for pulling and supporting the vehicle toward the vehicle body, or the spindle 11 of the triangular arm may be rotated by another cylinder to rotate the triangular arm. In this example, a cylinder is used for driving, but a driving source for advancing / retreating and locking the rear bumper can be a motor as well.

FIG. 2 is a side view of the rear bumper device according to the second embodiment of the present invention. By connecting the lock arm 3 to the conventional rear gate opening / closing lock mechanism 12 and turning on / off the rear gate opening / closing lock mechanism when the dump truck 13 is tilted, the rear bumper device is also turned on / off at the same time. ing. Therefore, the rear gate opening / closing lock 14
The tip end of the lock arm 3 is connected to an operating rod 16 having an intermediate portion pivotally supported by an operating cylinder 15 for turning on and off. The main frame of the vehicle body 10 is also provided with a stopper 17 that regulates the movement of the connecting portion between the operating rod 16 and the lock arm 3 at a constant level. When the rear gate is opened, when the operating cylinder 15 rotates the operating rod 16 so that the rear gate opening / closing lock 14 is in the OFF state as seen by the chain double-dashed line, the lock arm 3 also moves and the triangular arm 2 moves. The rear bumper is rotated to pull it toward the vehicle body to support it.

FIG. 3 is a side view of a rear bumper device according to a third embodiment of the present invention, in which the lock arm 3 is connected to a conventional rear gate opening / closing lock mechanism 12 as in the second embodiment. Is. In this example, the link mechanism is used when the loading platform is heavy. In this example, the conventional triangular arm 2
The other end of the lock arm 3 provided at the rear side is pivotally supported to the side surface of the dump truck 13 and the rear gate opening / closing lock mechanism 12
The operating rod 17 of is connected.

FIG. 4 is a side view of a rear bumper device according to a fourth embodiment of the present invention, which is a link mechanism when the loading platform is light and does not have a rear gate opening / closing lock mechanism. The upper and lower sides of the lock arm 3 provided to the conventional triangular arm 2 are connected to the sub block frame 18 whose one end is pivotally supported to the side surface of the dump carrier 13 so that the carrier hinge 19 of the carrier 13 serves as a rotation axis. Turn on the rear bumper lock
-Used for OFF. In this example as well, the main frame of the vehicle body 10 is provided with the stopper 17 that regulates the movement of the connecting portion of the lock arm 3 constantly.

FIG. 5 is a side view of a rear bumper device according to a fifth embodiment of the present invention, which is a triangular arm 2 forming a parallel link.
An example in which the vehicle is rotatably provided to the rear of the vehicle body is shown. As described above, even when the triangular arm 2 is provided on the rear side of the vehicle body with respect to the rear arm 6, the lock arm 3 can be connected to the rear gate opening / closing lock mechanism 12 that has been conventionally provided.

[0017]

According to the present invention, when the dump truck is tilted,
When the ferry is getting on or off, the rear bumper locks on naturally, following a simple operation or tilting of the dump truck.
-It is now possible to turn it off or pull it to the side of the vehicle to support it, preventing the rear bumper from touching other objects, damaging it, or hindering work.

[Brief description of drawings]

FIG. 1 is a side view of a rear bumper device according to a first embodiment of the present invention.

FIG. 2 is a side view of a rear bumper device according to a second embodiment of the present invention.

FIG. 3 is a side view of a rear bumper device according to a third embodiment of the present invention.

FIG. 4 is a side view of a rear bumper device according to a fourth embodiment of the present invention.

FIG. 5 is a side view of a rear bumper device according to a fifth embodiment of the present invention.

[Explanation of symbols]

 1 Bum Paste 2 Triangular Arm 3 Lock Arm 4 Rotation Locking Means 5 Rear Bumper 6 Rear Arm 7 Sublock Frame 8 Cylinder 9 Mounting Plate 10 Car Body 11 Triangular Arm Spindle 12 Rear Gate Open / Close Lock Mechanism 13 Dump Platform 14 Rear Gate Open / Close Lock 15 Actuating Cylinder 16 Actuating rod 17 Stopper 18 Sublock frame 19 Platform hinge

Claims (4)

[Claims] 1. A bumper stay 1 is supported substantially horizontally and at a predetermined position by a plurality of arms that rotate forward from below with respect to both sides of a rear portion of a chassis, and at least one of the plurality of arms is a triangular arm 2. A rear bumper device for a truck or the like, wherein the rotation lock means 4 is provided from the triangular arm 2 via the lock arm 3. 2. A rear bumper device for a truck or the like, wherein the rotation lock means 4 according to claim 1 locks the lock arm 3 by a drive means such as a cylinder. 3. A rear bumper device such as a truck, wherein the rotation lock means 4 according to claim 1 connects the lock arm 3 to a rear gate opening / closing lock mechanism 12. 4. A rear bumper device such as a truck in which the rotation lock means 4 according to claim 1 connects the lock arm 3 to the dump carrier 13.