JP2002265066A - Safety device of deck board for cargo handling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a worker to always safely operate cart on a platform by preventing a downfall accident caused by the cart accidental entering the deck board put in a downward gradient state. SOLUTION: In a deck board for cargo handling, a deck board 4 is pivotally supported to the platform 1 to be raised and laid down manually or by the operation of an actuator. A downfall preventing stopper 12 is proved in a position on this side of the deck board to freely project and recess, and interlocking with the raising and lying down of the deck board, the stopper is projected and recessed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of bridging a truck such as a forklift truck on a platform from a platform by filling the gaps and steps with the platform by hanging the platform on a truck platform provided on a platform. The present invention relates to a safety device provided for preventing a cart from falling down in a cargo work deck board which facilitates loading and unloading of cargo by making the loading possible.

[0002]

2. Description of the Related Art Conventionally, loading deck boards for loading / distributing centers, warehouses, and the like are provided with a loading work deck board that eliminates a step with a truck bed and fills a gap so that a truck such as a forklift truck can be loaded on the platform. Is provided. In the loading deck board, a deck plate is supported so as to move up and down manually or by the operation of an actuator such as a hydraulic cylinder, and a lip extending from a leading edge of the deck plate is mounted on a truck bed. Things.

[0003]

By the way, when the truck is separated from the platform, the deck plate or the lip is inclined downward by its own weight, so that the cart on the platform enters the deck plate by mistake. There was a possibility that an accident of falling due to the inclination would occur.

Therefore, the present invention prevents such a fall accident and enables a cart to run safely on a platform.

[0005]

SUMMARY OF THE INVENTION For this purpose, a safety device for a loading deck board according to the present invention comprises a loading deck board supported on a platform so that the deck plate can be raised and lowered manually or by actuation of an actuator. Wherein a stopper for preventing falling is provided at a position in front of the deck plate so as to be able to protrude and retract, and the stopper is made to protrude and retract in conjunction with the up and down movement of the deck plate. Further, the present invention is characterized in that in the above-mentioned safety device, there is provided a sensing mechanism for sensing the operation of the deck plate or the lip, and a braking mechanism for moving the stopper for preventing falling down and out.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a loading deck board according to the present invention, in which a frame 2 is fixed in a flat U-shaped pit formed on a platform 1 and is shown in FIG. Thus, the support shaft 3 is provided horizontally, and the deck plate 4 is supported by the support shaft 3. A handle 6 is provided on the upper surface of the deck plate 4 so as to be able to be pulled out.
A spring-type balancer (not shown) for balancing the load on the deck plate between the frame 2 and the lower surface of the deck plate 4
Is provided. Therefore, by pulling out the handle 6 and lifting it up, the deck plate 4 can be manually moved up and down around the support shaft 3 as a fulcrum. An actuator (not shown) such as a hydraulic cylinder or a motor may be provided instead of the spring-type balancer, and the operation of the actuator may cause the deck plate 4 to move up and down.

[0007] Reference numeral 7 denotes a lip extending from the leading edge of the deck plate 4 via a pivot 8. The lip is linked by a link (not shown) so as to move up and down in conjunction with the up and down movement of the deck plate 4. Are linked. In addition, the structure for raising and lowering the deck plate 4 and the lip 7 in this manner is disclosed in Japanese Patent Laid-Open No. 9-1184.
Since various configurations are already known from No. 38 etc.,
Here, the description is omitted.

Reference numeral 10 denotes a flat plate supported by the frame 2 at a position in front of the deck plate 4.
And a plate-shaped stopper 12 for preventing falling is provided in the elongated hole so that the stopper 12 can move in and out, and the stopper 12 moves in and out in conjunction with the up and down movement of the deck plate 4. Hereinafter, the interlocking mechanism will be described in detail with reference to FIGS.

That is, a slide rail 13 is provided at the bottom of the lower pit of the flat plate 10, and a pair of cam pieces 15 having an inclined surface 14 formed at the upper edge are slidably supported along the slide rail 13 in the horizontal direction. At the same time, a roller 17 is provided at the lower end of a pair of support columns 16 extending downward from the fall prevention stopper 12, and the roller 17 is supported on the cam piece 15. Reference numeral 18 denotes a tension coil spring having one end fixed to the stopper piece 19 and the other end fixed to each cam piece 15, and reference numeral 20 denotes a chain for pulling the cam piece 15 against the elasticity of the coil spring. Reference numerals 21 and 22 denote rotatable sprockets provided for turning and guiding each chain in the lower pit. Each chain is wound around each sprocket and guided, and its tip is connected to the joint 23. One chain 24 is connected to the joint, and the chain 24 is fixed to a stopper 26 provided on the lower surface of the deck plate 4 via a braking mechanism 25.

The braking mechanism 25 is provided with bearings 29 and 30 on a horizontal board 40 at intervals, and the chain 2 is mounted on the board.
The sprockets 27 and 28 meshing with the chain are rotatably provided on the bearings 29 and 30 to guide the ratchet 4, and the ratchet pawl 32 is pivotally supported on the bearing 29 by the support shaft 31.
The toe 37 of the ratchet claw 32 is moved to the chain 2 by its own weight.
4, an L-shaped link 34 is pivotally supported on the bearing 30 by a support shaft 33, and a tension spring 36 is stretched at one end of the L-shaped link 34 between the bearing 30 and the L-shaped link 34. 3
The pin 38 provided at the other end of the pin 4 faces the lower side of the tip 39 of the ratchet claw 32. The ratchet claw 3
2 prevents the chain 24 from returning toward the sprocket 22 by engaging with the chain 24 in this manner.

Reference numeral 50 denotes a sensing mechanism provided for sensing the operation of the deck plate 4 and the lip 7 and pulling the wire 51 to release the engagement between the ratchet pawl 32 and the chain 24. A cylindrical body 53 is vertically mounted on the cylindrical body 52, and is urged upward by a coil spring 54 into the cylindrical body so that a spindle 55 is provided so as to be able to protrude and retract from an upper end opening of the cylindrical body, and is fixed to one side of the spindle. A pin 56 is projected from an elongated hole 57 formed in the cylindrical body, and a horizontal shaft 59 is supported by a bearing 58 fixed on the substrate 52. A hanging shaft 60 projects substantially upward, a sensing shaft 61 projects substantially perpendicular to the hanging shaft, and a sensing shaft 62 extending below the pin 56 projects. The spindle 55 faces the lower surface of the tip of the deck plate 4. Reference numeral 63 denotes a tension spring having one end moored to the hook shaft 60. When the sensing shafts 61 and 62 are unloaded, the hook shaft 60 is held in an inclined shape by the elasticity of the tension spring.

In the safety device constructed as described above, when the deck plate 4 is activated upward, the chain 24 is pulled in the direction shown by the arrow as shown in FIG. The cam pieces 15 slide on the slide rails 13 against the elasticity of the coil springs 18, and the rollers 17 supported on the cam pieces 15
, The fall prevention stopper 12 sinks into the elongated hole 11. Then, by lowering the deck plate 4 in accordance with the height of the truck bed (not shown) and mounting the lip 7 on the truck, a cart such as a forklift truck can freely ride on the truck. Then, loading and unloading of luggage are performed. At this time, the tension of the chain 24 by the deck plate 4 is eliminated, but since the ratchet pawl 32 is engaged with the chain 24, the chain 24 does not return and there is no possibility that the fall prevention stopper 12 is unnecessarily projected.

When the truck starts moving and the deck plate 4 which has lost its support by the carrier falls down as shown in FIG. 9, the spindle plate 55 pushes down the spindle 55, so that the pins 56 of the spindle move the sensing shaft. The wire 51 is pulled by pushing down on the hook 62 to tilt the hook shaft 60 forward, and the wire pulls the L-shaped link 34, so that the ratchet pawl 32 is lifted by the pin 38, and the toe 37 is disengaged from the chain 24, and the ratchet pawl 32 And the chain 24 are disengaged. Therefore, the chain 2
The 4, 20, and the cam pieces 15 are returned by the elasticity of the coil spring 18, and the rollers 17 are raised along the slopes 14, and the stoppers 12 for preventing falling are protruded from the elongated holes 11. As described above, the fall prevention stopper 12 automatically protrudes in conjunction with the deck plate 4 being tilted downward, so that the cart or the like on the platform enters the deck plate by the stopper. Since it can be prevented, the occurrence of a fall accident or the like can be prevented. Further, even when the sensing shaft 62 is pushed down by the lip 7 as shown by the broken line in FIG. 9, the hooking shaft 60 is tilted, the wire 51 is pulled, and the ratchet claw 32 is disengaged. The stopper 12 protrudes.

As described above, the stopper 12 for preventing falling is
Since the deck plate 4 is automatically protruded when it falls down, it functions reliably when necessary and safety is achieved. Also deck board 4
The fall prevention stopper 1 in conjunction with the
2 moves down and does not hinder the work.

In this embodiment, the sensing mechanism 50 can sense the operation of the deck plate 4 and the lip 7, but it may sense only one of them. Such a sensing mechanism can also be provided at the tip of the deck plate 4. In this embodiment, the state of the deck plate 4 and the lip 7 is mechanically detected. However, a limit switch, a sensor, or the like may be provided to electrically detect the state. In this embodiment, the up-and-down movement of the deck plate 4 and the movement of the stopper 12 are mechanically linked, but the stopper 12 may be moved by an actuator such as a motor. .

[0016]

As described above, according to the present invention, in a loading work deck board in which a deck plate is supported on a platform so that the deck plate can be moved up and down manually or by the operation of an actuator, a fall prevention device is provided at a position in front of the deck plate. A stopper is provided so that it can be moved up and down, and the stopper moves up and down in conjunction with the up and down movement of the deck plate, so that a cart may accidentally fall on the deck plate that has fallen down and cause a fall accident. There is a beneficial effect of improving the safety of the loading operation without danger.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a loading deck board according to the present invention.

FIG. 2 is a vertical cross-sectional view of the loading deck board according to the present invention.

FIG. 3 is a view taken along line AA of FIG. 2;

FIG. 4 is a view taken along line BB of FIG. 2;

FIG. 5 is an enlarged view taken along line CC of FIG. 2;

FIG. 6 is a sectional view taken along line DD of FIG. 5;

FIG. 7 is an enlarged view of a main part of FIG. 2;

FIG. 8 is a longitudinal sectional view showing an operation state of the safety device of the deck board for cargo work according to the present invention.

FIG. 9 is a longitudinal sectional view showing an operation state of the safety device for the deck board for loading work according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Platform 2 Frame 3 Support shaft 4 Deck plate 6 Handle 7 Lip 12 Fall prevention stopper 15 Cam piece 17 Roller 25 Braking mechanism 24 Chain 32 Ratchet claw 50 Sensing mechanism 61, 62 Sensing axis

Claims (2)

[Claims] In a loading deck board for supporting a deck plate on a platform so that the deck plate can be raised and lowered manually or by the operation of an actuator, a stopper for preventing falling is provided at a position in front of the deck plate so as to be freely retractable. A safety device for a cargo handling deck board, characterized in that the stopper moves up and down in conjunction with the up and down movement of the work. 2. The safety device according to claim 1, further comprising a sensing mechanism for sensing the operation of the deck plate or the lip, and a braking mechanism for moving the stopper for preventing the fall from moving.