JPH11292489A - Forklift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stack up containers longitudinally with a forklift used for transporting open containers loaded with steel pipes, marine containers and the like. SOLUTION: A forklift is composed of frames 2 to be inserted into longitudinal lower pockets B of a container A, front wheels 3 provided in the front side of the frames 2, rear wheels 4 provided in the rear side of the frames 2, forks 5 provided so that they can be elevated with respect to the frames 2 between the front 3 and rear 4 wheels and lift up the container A, an elevating device 6 provided in the rear side of the frames 2 to elevate the forks 5, and a supporting device 7 provided in the front side of the frames 2 to support the end of the forks 5, and it is to specially lift up the container A from the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a forklift used for transporting, for example, an open container or a marine container loaded with steel pipes.

[0002]

2. Description of the Related Art Conventionally, as a forklift of this type, an ordinary counterbalanced front forklift is known. As is well known, this is provided on a vehicle body, a front wheel (drive wheel) provided on the front side of the vehicle body, a rear wheel (redirect wheel) provided on the rear side of the vehicle body, and a vehicle body provided on the front side of the front wheel. It comprises an elevating device, a fork which is raised and lowered by the device, and a balance weight provided on the rear side of the vehicle body. In such a case, a fork is inserted under the eaves from the side of the container and lifted and transported by an elevating device.

[0003]

However, in such a case, the container is lifted from the lateral direction so that the center of gravity of the load is minimized, so that the width of the traveling passage is the length of the container in the longitudinal direction. It was necessary only for the minutes, and it was not possible to stack the containers in the longitudinal direction. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and has been made in order to solve the problem. An object of the present invention is to provide a forklift capable of stacking containers in a longitudinal direction.

[0004]

A forklift according to the present invention basically comprises a frame inserted under a eaves of a pallet, a front wheel provided on a front side of the frame, and a rear wheel provided on a rear side of the frame. A fork provided between the front wheel and the rear wheel so as to be able to move up and down with respect to the frame and capable of lifting the pallet; a lifting device provided at the rear side of the frame for raising and lowering the fork; and a lifting device provided at the front side of the frame. The present invention is characterized in that it comprises a support device for supporting the tip of the fork.

[0005] The forklift is advanced, and its frame and fork are inserted under the eaves from one longitudinal side of the container. When the lifting device is operated to raise the fork, the container is lifted. When stacking containers, the container is raised by the height of the container, the frame is inserted under the eaves of the already placed container, and the fork and container are positioned above the already placed container. The container is stacked by lowering the fork according to the device. When transporting a container, the container is lifted so as to be slightly separated from the ground, the fork tip is supported by a support device, and then the container is transported by operation of a forklift. Since the fork is used to lift the container from the longitudinal direction, the container can be stacked in the longitudinal direction. When transporting the container, the tip of the fork is supported by the support device, so that the fork does not shake and the load does not collapse, and the fork is not damaged.

[0006] It is preferable that the forks have a pair of left and right sides and are configured to move up and down on both left and right sides of the frame. In this way, the horizontal piece of the fork can be positioned below the height of the frame, and the container can be easily inserted under the eaves.

[0007] The rear wheel is preferably configured to be able to move up and down with respect to the frame. By doing so, the rear side of the frame can be raised and lowered by raising and lowering the rear wheel,
It is possible to prevent the bottom of the frame from contacting the ground or the like during uphill traveling.

A pin provided at the front side of the frame and projecting laterally to hold a tip of the fork, and a pin which can be buried in the frame to allow the fork to move up and down; It is preferable to comprise a cylinder for moving the pin. With this configuration, the tip of the fork can be reliably supported by a simple configuration.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a forklift of the present invention. FIG. 2 is a plan view of FIG. 1. FIG. 3 is a perspective view showing the open container.

The main part of the forklift 1 is composed of a frame 2, a front wheel 3, a rear wheel 4, a fork 5, a lifting device 6, and a support device 7.

The frame 2 is inserted under the eaves B in the longitudinal direction of the container A. In this example, the frame 2 has a plate-like and step-like shape and is inserted into the eaves B under the eaves in the longitudinal direction of the container A. A horizontal portion 8, a rising portion 9 extending upward from a rear end thereof, and a short horizontal portion 10 extending rearward from an upper end thereof are provided. A power unit 11 having an engine and a hydraulic pump rotated by the engine is provided on the rear upper portion of the long horizontal portion 8, and a rear wheel is provided above the short horizontal portion 10. A driver's cab 12 provided with a steering wheel and a seat for turning the vehicle 4 is provided.

The front wheel 3 is provided on the front side of the frame 2. In this example, the front wheel 3 is a free wheel, and right and left support plates 13 projecting from the front side of the long horizontal portion 8 of the frame 2 are provided. Two tires (eight in total) are provided on both left and right sides of the support plate 13 so as to be rotatable around a horizontal axis.

The rear wheel 4 is provided on the rear side of the frame 2. In this example, the rear wheel 4 is a turning drive wheel and can be moved up and down with respect to the frame 2. 10, a revolving body 15 provided to be pivotable about the longitudinal axis, a turning cylinder (not shown) for revolving the revolving body 15 with respect to the frame 2, and a revolving body 15 refractably provided. Left and right refracting links 16, tires 17 rotatably provided on the left and right sides of each refracting link 16 (total of four) about a horizontal axis, and rotating each tire 17 provided on each refracting link 16. Hydraulic motor (not shown)
And a lifting cylinder 18 for bending each bending link 16. The hydraulic motor is adapted to be rotated by pressure oil from a hydraulic pump of the power unit 11,
The hydraulic transmission device (HST) is made based on these.

The fork 5 is provided between the front wheel 3 and the rear wheel 4 so as to be able to move up and down with respect to the frame 2 so as to lift the container A. In this example, a pair of left and right forks 5 is provided on both left and right sides of the frame 2. The container is provided with a horizontal piece 19 which is adapted to move up and down and corresponds to the length of the container A in the longitudinal direction, and a vertical piece 20 extending upward from the rear end thereof.

The elevating device 6 is provided on the rear side of the frame 2 to elevate and lower the fork 5. In this example, the elevating device 6 is a mast type and has a long horizontal portion 8 of the frame 2 located in front of the power unit 11. Mast 21 erected in
It comprises an elevating body 22 which is provided so as to be able to elevate and to which the vertical piece 20 of the fork 5 is attached, a lift cylinder (not shown) for elevating the elevating body 22 with respect to the mast 21, and the like.

The support device 7 is provided on the front side of the frame 2 and supports the tip of the fork 5. In this example,
A protruding and retracting type, a pair of right and left corresponding to the fork 5, provided at the front side of the long horizontal portion 8 of the frame 2, projecting laterally and supporting the tip of the fork 5. A pin 23 is provided which can be buried in the frame 2 to take a buried position allowing the fork 5 to move up and down, and a cylinder 24 for moving the pin 23.

The container A is provided with an eaves lower portion B in the longitudinal direction. In this example, the container A is an open container, and a frame-shaped (or plate-shaped) bottom material C and a lower portion of the lower material C project slightly downward. A pair of left and right upright columns D standing up and down, an eaves below B formed below the bottom material C by each of the columns D projecting downward, and an upper and lower column of each column D for stacking containers A It has matching irregularities (not shown) to prevent relative movement, the outer shape is almost the same as a normal container, and a lot of luggage (not shown) such as long steel pipes can be loaded. I have.

Next, the operation will be described based on such a configuration. When the rear wheel 4 is driven to rotate by the hydraulic motor and turned by the turning cylinder, the forklift 1 is operated. After the forklift 1 is advanced and the long horizontal portion 8 of the frame 2 and the horizontal piece 19 of the fork 5 are inserted from one side in the longitudinal direction of the container A into the eaves below B, the lifting device 6 is operated and the fork 5 is raised. Then, the container A is lifted.

When stacking (stacking) the containers A, as shown by the dashed line in FIG. 1, the containers 2 are raised by the height of the containers A, and the frames 2 are inserted under the eaves B of the already placed containers A. At the same time, after the fork 5 and the container A are positioned above the already placed container A, the fork 5 is lowered by the lifting device 6. When the container A is transported, the container A is lifted to take off slightly as shown by a two-dot chain line in FIG. 1, and the cylinder 24 of the support device 7 is extended to move the pin 23 to the side of the frame 2. From the horizontal piece 1 of the fork 5
After the tip of the forklift 9 is supported by being placed, the forklift 1 is operated.

Since the container A is lifted from the longitudinal direction by the fork 5, the container A can be stacked in the longitudinal direction. At the time of transporting the container A, the tip of the fork 5 is supported by the support device 7, so that the fork 5 does not shake and the load collapses, and the fork 5 is not damaged. In the forklift 1, as shown in FIG. 1, the center of the load W is located between the front wheel 3 and the rear wheel 4, and the load W on the fork 5 is received by the front wheel 3 and the rear wheel 4. Therefore, unlike the conventional forklift, there is no need to balance the load on the fork and the balance weight, so that the vehicle weight can be reduced as much as the vehicle strength can be satisfied.

In the above example, the support device 7 is provided with a pin 23.
Is moved linearly in the horizontal direction so as to appear and disappear. However, the present invention is not limited to this. For example, the support may be turned around the longitudinal axis to appear and disappear. The container A is an open container in the above example, but is not limited thereto.
As shown in FIG. In this case, since the marine container does not include the eaves B in the longitudinal direction, the eaves B are formed by using a sleeper E or the like.

[0022]

As described above, according to the present invention, as described above,
The following excellent effects can be obtained. (1) The frame inserted under the eaves in the longitudinal direction of the container, the front wheel provided on the front side of the frame, the rear wheel provided on the rear side of the frame, and the frame between the front wheel and the rear wheel. It is composed of a fork provided to be able to lift and lower the container, a lifting device provided at the rear side of the frame to lift the fork, and a supporting device provided at the front side of the frame to support the tip of the fork, Since the containers are lifted from the longitudinal direction, the containers can be stacked in the longitudinal direction. (2) Since the supporting device for supporting the tip of the fork is provided, the tip of the fork can be supported by the supporting device when transporting the container, and the fork may be shaken and the load may be collapsed or the fork may be damaged. Absent.

[Brief description of the drawings]

FIG. 1 is a side view showing a forklift of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a perspective view showing an open container.

FIG. 4 is a perspective view showing a marine container.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Forklift, 2 ... Frame, 3 ... Front wheel, 4 ... Rear wheel, 5 ... Fork, 6 ... Lifting device, 7 ... Supporting device, 8 ...
Long horizontal section, 9 upright, 10 short horizontal section, 11 power unit, 12 cab, 13 support plate, 14, 17
... tire, 15 ... revolving body, 16 ... refraction link, 18 ... lifting cylinder, 19 ... horizontal piece, 20 ... vertical piece, 21 ... mast, 22 ... lifting body, 23 ... pin, 24 ... cylinder, A ...
Container: B: Under eaves; C: Bottom material; D: Prop; E: Sleeper; W: Load.

Claims (4)

[Claims] 1. A frame inserted under a longitudinal eaves of a container, a front wheel provided on a front side of the frame, a rear wheel provided on a rear side of the frame, and a frame provided between a front wheel and a rear wheel. A fork provided to be capable of lifting and lowering the container, a lifting device provided at the rear side of the frame to lift the fork, and a supporting device provided at the front side of the frame to support the tip of the fork. A forklift characterized by the following. 2. The forklift according to claim 1, wherein the rear wheel is configured to be able to move up and down with respect to the frame. 3. The fork is configured so that there are a pair of left and right forks, and the forks move up and down on both left and right sides of the frame.
The forklift described in. 4. The support device may be provided at a front side of the frame and project from a side where the fork projects outward and carries the tip of the fork, and a buried position where the support device is buried in the frame and allows the fork to move up and down. The forklift according to any one of claims 1 to 3, comprising a pin and a cylinder for moving the pin.