JPH0230891B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a container lock safety device for preventing containers from falling due to forgetting to engage the container lock in a luggage transport vehicle.

[Prior Art] Conventionally, in cargo transport vehicles used in steel mills, smelters, shipyards, etc., a U-shaped trailer chassis is connected to the rear of the towing part of a truck, and the inner frame of this trailer chassis is Various types of removable containers are loaded on the vehicle to accommodate various objects to be transported, such as heavy objects, large-capacity objects, or long objects, and a container lock is provided for safe loading of the containers.

[Problem that the invention seeks to solve]

However, if the inner frame of the trailer chassis is dumped without locking the container, the container may fall, which is very dangerous. SUMMARY OF THE INVENTION An object of the present invention is to provide a container lock safety device that prevents the inner frame from being dumped when the container is not locked.

[Means for solving problems]

Therefore, the present invention is a container lock safety device for a luggage carrier 1 which is provided with an inner frame 5 inside an outer frame 4 which can be horizontally lifted with a container 7 loaded thereon and can be dumped. A retractable rod 9 that locks the container 7 by engaging with a recess 10 on the side of the container 7 is provided on the side surface, and when the container lock operation air valve 15 is turned on and the retractable rod 9 protrudes, the inner frame 5 rises horizontally. In addition, it is an air circuit that enables dumping, and when the container lock operation air valve 15 is turned off and the retractable rod 9 is retracted, the inner frame 5 can only rise horizontally, and the inner frame 5 and outer frame 4 Electric switch 1 that operates according to the positional relationship of
An air circuit is provided which closes the hydraulic valve 11 for raising and lowering the dumper and disables dumping even if a dumping operation is performed by the signal 9.

[Effect]

As a result of implementing the above means, when the container 7 is not locked to the inner frame 5, the container 7 can be mounted on the inner frame 5 and lifted horizontally, but if the container 7 is further lifted in an attempt to dump the inner frame 5, the container 7 is not locked. Electric switch 19
operates and issues a signal, and the air circuit stops the hydraulic valve 11 for raising and lowering the dump, so the inner frame 5 does not dump.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be explained below with reference to the drawings showing one embodiment.

First, as shown in FIG. 1, a luggage carrier 1 consists of a truck 2 and a U-shaped trailer chassis 3 connected to the rear of the truck 2. This trailer chassis 3 has a U-shaped inner frame 5 that can be freely operated for dumping inside an outer frame 4.
The inner frame 5 has a lower edge thereof bent and extended inward to form a horizontal portion 6.

FIG. 3 shows a container 7 for objects to be transported, which is mounted on the inner frame 5 of the trailer chassis 3 for transport. In this case, the horizontal portion 6 supports the container 7 from below. Furthermore, when loading or unloading the container 7 on the inner frame 5, the inner frame 5 itself is lowered, and when the luggage carrier 1 is operated, the inner frame 5 is raised horizontally. There is.

The container lock is formed on the side of the container 7 that corresponds to and engages with a retractable retractable rod 9 provided in a pair of holes 8, 8 formed on the inner surface of the inner frame 5. It consists of a recessed part 10.

Therefore, when loading or unloading the container 7 on the inner frame 5 of the trailer chassis 3, the retractable rod 9 is recessed into the hole 8.
In addition, when loading the container 7 on the inner frame 5 and driving the luggage carrier 1 or dumping the inner frame 5, the retractable rod 9 is projected and engaged with the recess 10 of the container 7, and the container 7 is It is designed to be fixed.

However, if a dump operation is performed without locking the container, there is a risk that the container 7 will fall from the inner frame 5.

Therefore, the container lock safety device of the present invention is activated to prevent the inner frame 5 from being dumped.

Next, the structure of the container lock safety device will be explained with reference to piping diagrams shown in FIGS. 4 to 7.

11 is a hydraulic valve for up and down the dump truck;
is an air cylinder for operating this hydraulic valve 11. Reference numeral 13 designates a dump up/down operation air valve, which is communicated with the air cylinder 12 through a passage pipe a, and via an air relay valve 14 with the air cylinder 12 through a passage pipe b. Incidentally, compressed air at a constant pressure is always sent to the dump up/down operation air valve 13 from an air tank (not shown).

15 is a container lock operation air valve;
Compressed air at a constant pressure is always sent from the air tank, and is communicated with the container locking air relay valve 16 through a passage pipe c. The container lock air relay valve 16 is communicated with the container lock air cylinder 17 through a passage pipe d.
Further, the air relay valve 14 and the magnetic air valve 18 are connected to each other by a passage pipe e.
In addition, this container lock air relay valve 16
Compressed air at a constant pressure is always supplied from the air tank.

An electric switch 19 is attached to the upper surface of the outer frame 4 so that a part of the inner frame 5 is located above the electric switch 19. The switch is turned on and off depending on the positional relationship between the outer frame 4 and the inner frame 5, and is set to be off when the inner frame 5 is raised horizontally, and switched from off to on when the inner frame 5 is dumped. This electric switch 1
9 is wired to the magnetic air valve 18.

In addition, in FIG. 2, the hydraulic valve 11,
The installation positions of the air cylinder 12, dump up/down operation air valve 13, air relay valve 14, container lock operation air valve 15, container lock air relay valve 16, container lock air cylinder 17, magnetic air valve 18, and electric switch 19 are determined. It shows. Furthermore, the air relay valve 14 and container lock air relay valve 16 of the present invention may be of any type as long as it senses signal air and turns on and off a separately connected air circuit, but there are no particular restrictions. isn't it.

Hereinafter, the operating state of the container lock safety device of the present invention configured as described above will be described.

When the retractable rod 9 of the container lock protrudes from the hole 8, that is, when the container lock operation air valve 15 is in the ON state as shown in FIG. 4, the container lock air relay valve is released from the container lock operation air valve 15. 16, the container lock operation air valve 15 is in an OFF state, and no air is supplied to the container lock air cylinder 17.

At this time, when the dump lever 20 of the dump up/down operation air valve 13 is raised, the air cylinder 1 is moved through the air relay valve 14 as shown by the arrow.
2, the hydraulic valve 11 is turned on, and normal dumping operation becomes possible.

Next, if you forget to engage the container lock and leave the retractable rod 9 in the hole 8, that is, if the container lock operation air valve 15 is in the OFF state as shown in FIG. Signal air is sent from the air valve 15 to the container lock air relay valve 16, and the container lock air relay valve 16 is in the on state, air is supplied to the container lock air cylinder 17 as shown by the arrow, and at the same time the magnet Air is also supplied to the air valve 18 as shown by the arrow. However, if the electric switch 19 on the top surface of the outer frame 4 is in the off state (it remains off while the inner frame 5 is rising horizontally from the lowest position), no signal air is sent to the air relay valve 14, and the dump When the dump lever 20 of the operation air valve 13 is raised, air is supplied to the air cylinder 1 via the air relay valve 14 as shown by the arrow, and the hydraulic valve 11 is turned on, allowing normal lifting operation.

When the dump lever 20 continues to be operated and the inner frame 5 begins to dump, the electric switch 19 is grounded, the magnetic air valve 18 is turned on, and the container lock air relay valve is activated as shown in FIG. Signal air is sent from the air relay valve 16 to the air relay valve 14, and the air that had been supplied to the air cylinder 12 for operating the hydraulic valve 11 is drained to the outside from the air relay valve 14, and the inner frame 5 no longer dumps.

In addition, when lowering the inner frame 5, as shown in FIG. 7, by lowering the dump lever 20 of the dump up/down operation air valve 13, the hydraulic valve 11 is always activated, regardless of whether the container lock is engaged or not. Air is supplied to the air cylinder 12 in the direction of the arrow, and the inner frame 5 is lowered.

〔Effect of the invention〕

As described above, in the container lock safety device for the luggage carrier of the present invention, if the container is not locked to the inner frame, even if a dump operation is performed, the inner frame will not dump due to the signal from the electric switch, so the container will fall. There was nothing to do and it was safe.

[Brief explanation of drawings]

Figure 1 is a perspective view of the luggage carrier, Figure 2 is a plan view schematically showing the luggage carrier, Figure 3 is a perspective view of the container, and Figures 4 to 7 show the piping state of the container lock safety device. FIG. 1... Luggage carrier, 3... Trailer chassis, 4... Outer frame, 5... Inner frame, 7... Container, 8... Hole, 9... Recessed rod, 10... Recess, 11... Hydraulic valve, 15...
...Container lock operation air valve, 19...Electric switch.

Claims (1)

[Claims] 1 A container lock safety device for a luggage carrier 1 which is equipped with an inner frame 5 inside an outer frame 4 which is capable of horizontally rising with a container 7 loaded thereon, and which is capable of dumping.
A retractable rod 9 that locks the container 7 by engaging with a recess 10 on the side of the container 7 is provided on the inner surface of the container 7. When the container lock operation air valve 15 is turned on and the retractable rod 9 protrudes, the inner frame 5 This is an air circuit that allows the container to rise horizontally and further dump. When the container lock operation air valve 15 is turned off and the retractable rod 9 is retracted, the inner frame 5 can only rise horizontally, and the inner frame 5 and the outer A container lock in a luggage carrier 1 characterized in that it is provided with an air circuit that closes the hydraulic valve 11 for raising and lowering the dumper and disables dumping even if the dumper is operated by a signal from an electric switch 19 that operates depending on the positional relationship of the frame 4. Safety device.