JP3223405B2 - Forklift container spreader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container spreader which is known as one of attachments of a forklift and is used for loading and unloading containers, and more particularly to a wing type container spreader.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show a conventional wing type container spreader device. This spreader 26
Is mounted via a shaft 27 to a lift bracket 23 which moves up and down along a mast 22 of a forklift. The spreader 26 has a cylindrical rail holder 28 extending in the vehicle width direction, and left and right telescopic rails 29 are slidably fitted into the rail holder 28. At the ends of the left and right telescopic rails 29, left and right twist lock posts 30 are erected.
Is provided with a twist lock device 31 at the upper end thereof. Further, the twist lock device 31 is provided with a twist lock pin 32 for hanging the container, which is detachable from a hanging hole provided at the top corner of the container C.

In the wing type container spreader having such a structure, the strength of the container C is ensured by the twist lock pin 32 being easy to see from the driver's seat and the lower front part of the left and right twist lock columns 30 when loading and unloading the container. It has such features that the container C can be prevented from shaking in relation to supporting the left and right corners. As such a wing-type container spreader, for example, Japanese Utility Model Laid-Open No. 1-174397 can be mentioned.

[0004]

However, in the above-mentioned conventional wing type container spreader, the rail holder 28 and the telescopic rail 29 are arranged at the front position of the front tire 25 as shown in the figure, so that the center of the front tire is reduced. The distance L from to the load center (container center) was large. That is, the lost load center is large, and therefore, the forward rotational moment is large. To counter this, the balance weight 24 mounted on the rear part of the body frame (machine stand) 21 is enlarged to increase the vehicle weight. I needed to.

Further, since the distance from the telescopic rail 29, which is the support point of the twist lock column 30, to the twist lock pin 32, is large, the bending moment acting on the twist lock column 30 when the container is suspended is large. As a result of increasing the plate thickness of the twist lock column 30 in order to counteract the problem, the weight of the entire spreader is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a spreader which is mounted closer to the vehicle body and reduces the bending moment acting on the twist lock column, thereby reducing the lost load. An object of the present invention is to reduce the size of a load center and the weight of a twist lock support.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, a rail holder supported by a lift bracket movably mounted on the mast and extending substantially horizontally in the vehicle width direction, left and right telescopic rails supported by the rail holder so as to extend and contract, A container spreader for a forklift having left and right twist-lock struts fixed to the ends of the telescopic rails, and the telescopic rails extend to the outside beyond the left and right front tires, and are attached to the front tires. On the other hand, they are arranged in an upper position where they overlap in the vehicle front-rear direction and do not directly interfere with each other, and are connected to a substantially middle portion in the vertical direction of the left and right twist lock columns.

[0008]

In the forklift container spreader of the present invention constructed as described above, the mast can be mounted on a forklift standing near a vertical line passing through the center of the front tire. The distance from the center to the load center can be reduced. Further, as a result of the distance from the telescopic rail supporting the twist lock support to the twist lock pin being shortened, the bending moment acting on the twist lock support when the container is suspended is reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a front view showing a wing type container spreader according to the present embodiment, and FIG. 2 is a side view of the same. As shown, the spreader 6 is attached via a shaft 7 to a lift bracket 3 that moves up and down along the mast 2 of the forklift. In this embodiment, as shown in FIG. 2, the mast 2 is erected on the upper front end of the vehicle body frame 1 (machine stand) so as to be capable of tilting forward and backward and supported by a tilt cylinder 4. Above, that is, on a vertical line passing through the center of the front tire 5. In the drawing, 1a indicates a balance weight.

As shown in FIG. 1, the cylindrical rail holder 8 constituting the main body of the spreader 6 extends substantially horizontally in the vehicle width direction and has a length exceeding the outer width of the left and right front tires 5. have. And this rail holder 8
A pair of right and left telescopic rails 9 are slidably fitted in the, and are operated to expand and contract by a hydraulic cylinder or a hydraulic motor (not shown). Twist-lock struts 10 are respectively connected upright to the distal ends of the left and right telescopic rails 9. Twist-lock devices 11 are provided at the upper ends of the left and right twist-lock struts 10. The twist lock device 11 is provided with a twist lock pin 12 for hanging the container, which is detachable from a hanging hole provided in the top corner of the container C.

In this embodiment, when the spreader 6 mounted on the lift bracket 3 is located at the lower end, the rail holder 8 and the telescopic rail 9
It is arranged so as to overlap the front tire 5 in the vehicle front-rear direction and not directly interfere with the front tire 5, that is, a position above the front tire 5.

The twist lock column 10 is connected to the telescopic rail 9 at a substantially middle portion in the vertical direction. When the spreader 6 is located at the lower end, its lower end is separated from the ground by a slight gap. The joint site is set so that it comes close to the target. In addition, twist lock support 1
The front surface of the front tire 0 is set to be located slightly forward of the front end surface of the front tire 5.

In the wing type container spreader according to the present embodiment, the rail holder 8 and the telescopic rail 9 of the spreader 6 can be arranged close to the vehicle body by having the above-described configuration. Therefore, the distance L1 from the center of the front tire 5 to the center of load (the center of the container C) is reduced. That is, since the lost load center is shortened, the forward rotation moment during the loading and unloading of the container is reduced as compared with the conventional method, and the weight of the balance weight 1a mounted to counter this forward rotation moment can be reduced. It becomes possible. Therefore, it is possible to reduce the vehicle weight while securing the same front-back stability as before.

As shown in FIG. 2, when the container C is loaded and unloaded, the twist lock column 10 supports the rear surfaces of the left and right edges when the container C is supported by its lower front surface. I have. Therefore, a bending moment acts on the twist lock support 10, but at this time, in this embodiment, the twist lock support 1 having a substantially middle portion in the vertical direction connected to the telescopic rail 9.
In the case of 0, the bending moment is reduced as compared with the related art because the distance from the connecting portion to the twist lock pin 12 is short. As a result, while the strength of the twist lock support 10 is maintained at the same level as in the related art, the thickness of the twist lock support 10 can be reduced, and the weight can be reduced.

The telescopic rails 9 and the rail holders 8 suspended between the intermediate portions of the twist lock columns 10 do not obstruct the view of the lower part of the suspended container C, that is, improve the visibility of the lower part of the container. Since the container C can be secured, an advantage that the container C can be easily unloaded is obtained.

In this embodiment, the mast 2 is described as being erected on the front upper portion of the body frame 1,
The present invention can be applied to a type in which the mast 2 stands upright on the front axle shaft. Even in such a case, the rail holder 8 and the telescopic rail 9 can be arranged while avoiding interference with the front tire 5. . In the present embodiment, the rail holder 8 has a length exceeding the outer width of the left and right front tires 5, but this is not always necessary. If the tip of the telescopic rail 9 to which the twist lock support 10 is fixed always projects outside the left and right front tires 5, the rail holder 8 can be shorter than the outer width of the left and right front tires 5.

[0017]

As described above in detail, in the wing type container spreader of the present invention, the mast is arranged closer to the vehicle body by connecting the telescopic rail supporting the twist lock support to the intermediate portion of the twist lock support. Even if
Since the rail holder and the telescopic rail can be arranged while avoiding interference with the front tire, the entire spreader can be arranged closer to the vehicle body. As a result, the distance from the center of the front tire to the center of the load can be shortened and the lost load center can be reduced, so that the vehicle weight can be reduced. Further, the thickness of the twist lock column can be reduced by reducing the bending moment acting on the twist lock column, and the weight of the twist lock column can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a wing type container spreader according to an embodiment of the present invention as viewed from the front of a vehicle.

FIG. 2 is a side view of the wing type container spreader mounted on a forklift.

FIG. 3 is a front view of a conventional wing type container spreader as viewed from the front of the vehicle.

FIG. 4 is a side view of a wing-type container spreader mounted on a conventional forklift.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Body frame 2 ... Mast 3 ... Lift bracket 5 ... Front tire 6 ... Spreader 8 ... Rail holder 9 ... Telescopic rail 10 ... Twist lock support

Claims (1)

(57) [Claims] 1. A rail holder supported by a lift bracket movably mounted on a mast and extending substantially horizontally in a vehicle width direction, and left and right telescopic rails supported by the rail holder so as to be extendable and contractible. A container spreader for a forklift having left and right twist lock columns fixed to the ends of the left and right telescopic rails, the telescopic rails extending to the outside beyond the left and right front tires, A container spreader for a forklift, which is arranged at an upper position where the front tire overlaps with the front-rear direction of the vehicle and does not directly interfere with the front tire and is connected to a substantially middle portion of the left and right twist lock columns in the vertical direction. .