JPS5917040B2 - Fork mounting structure in forklift - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fork mounting structure for a forklift.

In particular, by adding innovation to the mounting structure of the fork to the lift bracket, we have achieved the improvement in forward visibility and the ease of manufacturing the fork, both of which were particularly strongly required in push-pull attachments.

Kono's invention skillfully utilized the unique properties of push-pull attachments and succeeded in satisfying the demands that had traditionally been particularly strong for push-pull attachments. Of course, it can also be applied and produces similar effects.

The present invention will be described in detail below with reference to push-pull attachments, which are the most suitable field of application of the present invention.

FIG. 1 is a perspective view of a typical example of a conventional push-pull attachment, in which 1 is a frame and 2 is a fork, both of which are attached to a lift bracket 7 and move up and down together with the lift bracket 7.

A bushing plate 5 is attached to the frame 1 via a pantograph 4 that is extended and contracted by a bushing cylinder 3, and a gripper 6 is attached to the lower end of the bushing plate 5.

The gripper 6 grasps the sheet pallet placed under the cargo, pulls the cargo onto the fork 2 by retracting the bushing plate 5, and pushes the cargo by moving the bushing plate 5 forward after transportation. , and lower it from fork 2.

Now, in the conventional push-pull attachment, as shown in FIG.
Hang it on the upper bar (Dobe horizontal beam) 7a, then lower the bar (
It was installed by supporting it from the rear with the lower cross beam) 7b.

Therefore, the driver's forward field of vision is the bush plate 5,
This will be doubly obstructed by the upper bar 7a, the lower bar 7b, the vertical portions 2a, 2a of the fork 2, etc.

In the push-pull attachment, since a delicate operation of gripping one end of the sheet pallet with the gripper 6 is required, good forward visibility is much more strongly required than in a normal fork device.

Nevertheless, as mentioned above, the visibility was doubly obstructed, and on top of that, the width of the fork 2 (and thus also the vertical portion 2a) was wider than a normal fork, which was an adverse condition.

Moreover, in terms of manufacturing the fork 2, it is difficult to forge due to its wide width, and if it were to be manufactured by welding, it would be very difficult to obtain the face angle, which was a serious problem.

These poor front visibility and difficulty in manufacturing were considered to be unavoidable and were overlooked, but in fact, they are due to the bushing plate 5 and because the fork 2 is wide. , there was a solution that could solve the above two problems at once. 3 In other words, FIG. There is a considerable gap between 6 and the fork 2.

This gap is absolutely necessary since the bushing plate 5 is moved via the pantograph 4.

This invention was made based on the idea of attaching the fork 2 to the lift bracket 7 using this gap, and one embodiment is shown in Fig. 4, but it is said that the correct attachment is the method. Should.

Moreover, this kind of attachment is possible because the width of the fork 2 is wide.

It will be explained in more detail.

Unlike the conventional device, the upper bar 71 and the lower bar 72 of the lift bracket 70 are both provided laterally (that is, so that the longest side of the rectangular cross section is horizontal).

The lower surface of the lower bar 72 has a T-shaped engagement protrusion 72a.
The fork 20(
(see Figure 5) is fitted.

What is important here is that the front carrier 20b forming one side of the T-slot 20a is completely accommodated in the gap that inevitably occurs between the gripper 6 and the fork 20 when the bushing plate 5 is retracted the most. That is what we are doing.

By using this gap, which can be called a dead space, to attach the fork 20, the fork 20 does not require a vertical part for attachment, and the forward field of vision can be significantly improved.

Moreover, the lack of strength of the attachment part that occurs when the fork 20 is attached by this method can be sufficiently compensated for by the fact that the width of the fork 20 of the push-pull attachment is wider than that of a normal fork.

In the embodiment described above, the engagement protrusion 72a was provided on the lower surface of the lower bar 72, and the engagement T-groove 20a was provided on the upper surface of the fork 20.

This is because it is more advantageous in terms of strength than the case where the engaging protrusion 72a and the engaging T-groove 20a are provided oppositely as shown in FIG. 6, but the arrangement shown in FIG. 6 is not impossible.

Further, the shapes of the engaging protrusions and the grooves are not limited to the T-shape, but may of course be formed into a dovetail shape, for example.

The fork mounting structure of the present invention has the lower bar 72 placed sideways and also eliminates the vertical part (rising part) of the fork 20, so it greatly improves the forward field of view, which is an absolute requirement for push-pull attachments and push-pull attachments. It has the excellent effect of making cargo handling work easier.

Moreover, since the vertical part of the fork 20 is no longer required, the serious manufacturing problems mentioned above are naturally resolved, reducing manufacturing costs.Furthermore, by greatly reducing the weight of the fork, it is possible to It is also possible to enjoy the effect of reducing the weight of the vehicle.

This effect is significant because reducing the weight of the equipment in front of the front wheels directly leads to an increase in the loading capacity of the forklift truck.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an example of a conventional push-pull attachment, Figure 2 is a perspective view showing the fork installed, and Figure 3 is an enlarged side view of the main part when the bushing plate is retracted the most. (partial cross section). 4 is a view corresponding to FIG. 3 of one embodiment of the fork mounting structure of the present invention, FIG. 5 is a perspective view of the fork shown in FIG. 4, and FIG. 6 is a view of another embodiment of the fork mounting structure of the present invention. FIG. 4 is a diagram corresponding to FIG. 4 showing an example. 1: Frame, 3: Push cylinder, 4: Pantograph, 5: Push plate, 6: Gripper, 20: Fork, 20a: T-groove for engagement, 20b: Front carrier, 20c: Rear carrier, 70: Lift bracket, 1
1 near bar, 72: lower bar, 72a: engagement protrusion.

Claims (1)

[Claims] 1. At least a lift bracket that is attached to a forklift so that it can be raised and lowered and that has a lower cross beam at its lower end;
A cargo handling device for a forklift truck including a fork and a pantograph attached to the lift bracket, and a bushing plate attached to the tip of the pantograph, wherein the fork has a planar shape without a rising part, and the fork and the lower cross beam are connected to each other. By mutually engaging the engagement protrusion provided on one side of the fork with the four engagement grooves provided on the other side, the fork can be slid in a cantilevered manner and in the lateral direction by the lower cross beam. A fork mounting structure characterized by being supported by.