JPS59190033A - Safety device for dump truck - Google Patents

Abstract

PURPOSE:To safely conduct loading or unloading for a heavy load, by coupling a power takeoff device and an arm lever of a truck with a coupling member. CONSTITUTION:When a rear body 3 is lifted up for dumping, a power takeoff (PTO) shaft rod 19 is pushed and a gear for a transmission 14 is engaged with a gear for a PTO9. At this time, since a coupling member 10 of the PTO9 pushes an arm lever 6 rearward, this arm lever 6 turns round centering on a shaft 7, and an engaging part 11 of the arm lever 6 makes a latch 5 rotate frontward whereby a hook part 4 of the latch 5 comes off a socket 8. When a heavy load 18 is loaded or unloaded to or from the rear body 3, owing to a load ramp 17, even if load is imposed thereon, the front of the rear body 3 is tilted by means of engagement between the latch 5 and the socket 8 installed in front of a hinge shaft 2 whereby there is no fear of being lifted upward, thus loading or unloading for the heavy load 18 can be performed in a safety manner.

Description

[Detailed Description of the Invention] When loading and unloading civil engineering machinery, construction machinery, and other heavy cargo onto a dump truck, the present invention provides a loading ramp (step board) on the loading platform (bed floor) to load and unload heavy cargo. This is a safety device for dump trucks that prevents the loading platform (bed floor) from rotating and tilting around the hinge axis during loading or unloading, thereby ensuring safe loading and unloading of heavy cargo.

BACKGROUND OF THE INVENTION Conventionally, there are times when dump trucks are used to transport heavy cargo such as civil engineering machinery and construction machinery.

At this time, if a heavy cargo is loaded by passing a loading ramp (step board) to the rear edge of the loading platform (bed floor), the entire weight of the cargo such as civil engineering machinery or construction machinery will be applied to the rear edge of the loading platform, and the loading ramp will be placed on the loading platform. A couple is generated due to the distance from the hinge shaft pivotally connected to the chassis-car frame to the rear edge of the loading platform floor and the aforementioned weight.

This force couple is larger than the opposite force due to the weight of the loading platform floor, dumping equipment, etc., causing the loading platform floor to reverse its slope, making loading heavy cargo very dangerous.

The present invention is a safety device for a dump truck that enables the above-mentioned conventional dangerous work to be carried out safely, and has a structure in which a loading platform 3 is rotatably and tiltably connected to a truck frame IK hinge shaft 2. In a dump truck, a latch 5 and an arm rod 6 having a hook portion 4 and operated by the operation of the arm rod are each pivoted to the vehicle frame 1 by a shaft 7, and the latch 5 is attached to a receiver 8 provided on the loading platform 3.
removably engages the truck's power take-off (PTO)
) 9 and the arm rod 6 are connected by a rod-shaped member (connecting rod) or other suitable connecting member 1o.

In the dump truck safety device, the latch 5 and arm rod 6 are separately attached to the vehicle frame 1 with a shaft 7, and the latch 5 is removably engaged with the engaging portion 11 of the arm rod 6. This is a safety device for a dump truck having a structure in which a spring 12 is provided at the latch 5 and the latch 5 is always engaged with the engaging portion 11 of the arm rod 6.

In the figure, 13 is the engine of the truck chassis, 14 is a transmission having gears that mesh with the gears of the power take-off device (hereinafter simply referred to as KPTO), 15 is a universal joint provided at both ends of the connecting member 10, and 16 is a wheel. , 17 is a loading ramp, 18 is a heavy cargo, and the nod is a spacer.

Since the present invention is constructed as described above, its operation will be explained.

When dumping up the loading platform 3 according to the present invention, first operate the PTO control lever in the driver's cab (not shown), and
A gear (not shown) of the transmission 14 and a gear (not shown) of the PTO 9 are brought into mesh with each other.

At this time, the connecting member 1o of the PTO 9 connects the arm rod 6 to the rear (fang 1
(to the right in the figure), the arm lever 6 rotates with the entire center of the shaft 7, and the latch 5, which is attached to the engaging portion 11 of the arm lever 6, is rotated forward, and the hook portion 4 of the latch 5 is moved from the receiver 8. break away.

Since the loading platform 3 can rotate and tilt around the hinge shaft 2, the cargo can be unloaded from the loading platform 3 by operating a dumping device (not shown), such as a fluid cylinder, to dump up the loading platform 3. I can do it.

At this time, when dumping up the loading platform 3, it is impossible to raise the dumping device with the dump device installed on the truck unless the gear of the PTO 9 is engaged, so when dumping up the loading platform 3, be sure to make sure that the latch 5 is disengaged from the receiver 8. It's happening.

When lowering the loading platform 3, the dumping device (not shown) of the loading platform 3 is moved to the lowered position.
If the lowering operation is performed while the gear 1 and the gear of the transmission 14 are engaged, the latch 5 will be in a position where it is disengaged from the receiver 8, so the platform 3 can be lowered without any problem.

Next, when the platform 3 is lowered with the gear of the PTO 9 disengaged, the latch 5 is in the position to engage with the catch 8, but since the platform 3 is not lowered, the receiver 8 is attached to the hook of the latch 5. 4, the spring 12 is extended, and the upper part of the latch 5 is lowered while tilting forward. When the lower receiving part of the receiver 8 is lowered to the lower side of the hook part 4, the latch 5 is moved by the spring 12. Due to the contraction of the hook part 4, the hook part 4 is pulled backward (rightward in the drawing of the fang 1) and engages with the catch 8, so that the loading platform 3 on the vehicle frame 1 is connected by the latch 5 and the catch 8, and the latch 5 Unless it leaves the receiver 8, it will remain in the 3-car carrier frame 1.

Therefore, when loading or unloading, for example, a civil engineering machine or a construction machine (heavy cargo) 18 on the loading platform 3 in this state, even if the load is applied by the loading ramp 17, the latch 5 provided in front of the hinge shaft 2 Loading platform 3 due to bond with gold 8
It is possible to load or unload the heavy cargo 18 safely without the risk of the front side of the truck tilting and rising, and the loading and unloading of the heavy cargo 18 can be carried out without danger without causing the loading platform 3 to tilt and rise due to the occurrence of a couple as in the conventional case. This has advantages such as a simplified configuration, very few failures, low manufacturing costs, and economical performance.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and Fig. 1 is a front view of the present invention, and Fig. '3+2 is a sectional view taken along line AA@ of the same. 1 is the vehicle frame, 2-piece hinge shaft, 3 is the loading platform, 4-piece hook part, 5 is the latch, 6-piece arm rod, 7 is the shaft, 8 is the receiver, 9 is the power take-off device (
PTO), 10 connecting members (connecting rods), 12 springs, 13 engines, 14 transmissions, 15
16 is a wheel, 17 is a loading lamp (
step board), 18 is heavy cargo, 19 is PTO shaft rod,
The nod is a spacer. Patent applicant: Tokyu Vehicle Manufacturing Co., Ltd.

Claims (2)

[Claims] (1) In a dump truck whose loading platform is rotatably and tiltably connected to the truck frame by a hinge shaft, a latch having a hook portion and operated by the operation of the arm rod and the arm rod are respectively pivoted to the vehicle frame, The latch is removably engaged with the receiver provided on the loading platform,
A safety device for a dump truck, characterized in that a power take-off device (PTO) provided on the truck and the arm rod are connected by a connecting member. (2) The latch and arm rod are separately provided on the vehicle frame, the latch is removably engaged with the retaining portion of the arm rod, and a spring is provided on the latch so that the latch always remains in the engaging portion of the arm rod. 2. The safety device for a dump truck according to claim 1, wherein the safety device is engaged with the safety device of claim 1.