JPS63258398A - Clamping device for forklift - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a forklift clamping device, commonly called a bale clamp, for gripping cargo from the side.

(Prior art) In this type of conventional clamp device, a rail holder is attached via a clamp base to the front of a lift bracket as a lifting member, and a pair of left and right clamp arms are attached to this rail holder so as to be movable in the left and right direction. The left and right clamp arms are moved inward or outward by a clamp cylinder to open and close. The clamp arm consists of a rail part that slides left and right along the rail holder, and an arm part that extends horizontally in front for gripping cargo, and the rail part and the arm part are fixed by welding. Usually, it has an integral structure. Such a lamp device is known, for example, from Utility Model Application No. 58-959.
It is disclosed in Publication No. 90.

(Problem to be solved by the invention) By the way, this type of clamping device is often used for loading cargo (generally cartons) into a container, but loading is sometimes done when parallel loads are separated from each other. Alternatively, a gap corresponding to the thickness of the arm portion of the clamp arm remains between the clamp arm and the wall (or a gap larger than that in the case of an unskilled person), so there is a problem that loading is inefficient.

Of course, this problem occurs not only when loading containers, but also in general cases, but in cases where the loading space is determined, such as in containers, the inefficiency of this loading is important. Therefore, in order to stack the cargo without leaving any gaps, it is necessary for the worker to correct the position of the cargo by shifting it laterally after loading the cargo into the container.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a clamping device for a forklift that can laterally shift a load after it has been carried in.

(Means for Solving the Problems) The present invention for solving the above problems provides a clamping device equipped with a pair of left and right clamp arms that can be opened and closed on the front surface of an elevating member that moves up and down along a mast. The gist is that the arm portion of at least one of the arms is movable forward and backward relative to the rail portion.

(Function) Therefore, after carrying the cargo gripped by the clamp arm to a predetermined location, the arm portion of one clamp arm is moved backward to evacuate the cargo from the side, and in this state, the other clamp arm is moved inward. By moving it, you can shift the load laterally.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings. First, the embodiment shown in FIGS. 1 to 5 will be described. In the figure, 1 is a lift bracket as an elevating member that is moved up and down along the mast 2 of a forklift.A clamp base 3 fixed to the front end of the lift bracket 1 has rail holders each having a groove-shaped cross section on the upper and lower front surfaces. 4
Two each are fixed horizontally. A pair of left and right clamp arms 5R, 5L are attached to the rail holder 4 so as to be movable in the left and right direction, and these clamp arms 5R, 5L are individually moved by clamp cylinders 6R, 6L. However, one clamp arm 5R
The rail holder 4 has an integral structure in which a rail part 7, which can be moved laterally through rollers (not shown), and an arm part 8 for gripping cargo are fixed by welding. The arm 5L is of a reciprocating type in which an arm part 10 for grasping cargo is movable back and forth on a rail part 9 which is movable left and right on the rail holder 4 via rollers (not shown).

That is, at the outer end of the rail part 9 of the reciprocating clamp arm 5L, there is an arm holder part 11 in the shape of an inclined cylinder whose front and rear sides are open.
is fixed by welding, and the arm portion 10 is fitted into this arm holder portion 11 so as to be movable forward and backward. Specifically, the arm portion 10 is formed into a substantially groove-shaped cross section with seven lunges on the top and bottom, front and rear sides of the back side thereof, and is movable back and forth through the arm holder portion 11. The upper 7 flange 10a has a smaller protrusion amount than the lower 7 flange 10b, and its protruding end surface is guided by a guide plate 12 vertically disposed on the upper inner wall surface of the arm holder portion 11.

Further, the arm portion 10 configured as described above is moved by a chain transmission mechanism 14 using a hydraulic motor 13 as a drive source. That is, the hydraulic motor 13 is installed on the upper part of the arm holder part 11 via a motor bracket 13a, and its driving sprocket wheel 15,
A chain 17 is hung around a pair of front and rear driven chain wheels 16 arranged on the inner surface of the outer plate of the arm holder section 11, and this chain 17 is arranged front and rear along the back surface of the arm section 1o. At the same time, one end thereof is connected to the front 7 flange 10c of the arm portion 10 via an anchor plate 18, and the other end is connected to the rear side flange 10d via an anchor plate 19. Note that 20 is an opening provided through the upper plate of the arm holder portion 11 for passage of the chain.

Further, the moving end of the arm portion 10 is regulated by the front and rear anchor plates 18 and 19 coming into contact with the front and rear end surfaces of the outer plate of the arm holder portion 11. However, a notch 21 of a predetermined depth is formed on the arm holder portion 11 side so that the front end surface of the arm portion 1o is flush with the front end surface of the arm holder portion 11 when the arm portion 1o is retracted. In addition,
Although not shown in the drawings, the direction of rotation of the hydraulic motor 13 is changed by changing the flow direction of the hydraulic oil supplied to the hydraulic motor 13 by switching a valve using, for example, an operating lever installed in the driver's seat.

The clamping device of this embodiment is constructed as described above, and therefore, when gripping the cargo W, the arm portion 10 of the retractable clamp arm 5L is moved forward as shown in FIG. Clamp cylinder 6R, 6
By moving the left and right clamp arms 5R and 5L at the same time, the load W can be gripped as shown in FIG. 4. If it is desired to shift the load W laterally after loading the load W, the arm portion 10 of the clamp arm 5L is moved to the arm via the chain transmission mechanism 14 by driving the hydraulic motor 13 as shown in FIG. If the arm part 10 moves backward along the holder part 11, the cargo W
In this state, the load W can be shifted laterally by moving the clamp arm 5R on the opposite side inward. Therefore, as shown in FIG. 5, for example, it is possible to stack the cargo W against a wall or the like without any gaps. The return of the arm portion 10 to the forward position, which is the original position, is performed by rotating the hydraulic motor 13 in the opposite direction to the backward movement.

Further, according to this embodiment, if the arm portion 10 is moved backward when traveling with no cargo, it is possible to reduce the turning radius at least in the clockwise direction as shown in FIG. 4. . Furthermore, since the chain transmission mechanism 14 that moves the arm section 10 back and forth is located at least inside the 7th lunge of the arm section 10, the chain 17 will not get tangled with or interfere with other objects and be damaged. Since the amount of protrusion of the lower flange 10b of the arm portion 10 is greater than the amount of protrusion of the upper 7 flange 10a, the rigidity of the lower side is higher than that of the upper flange 10a, which is effective in preventing the load from falling when clamped.

Next, other embodiments of the present invention will be described.

In the embodiment shown in FIG. 6, the chain 17 of the chain transmission mechanism 14 is disposed on the upper part of the arm portion 10, and the other configurations are the same as the embodiments described above. Therefore, this embodiment operates in the same manner as described above, and can move the cargo horizontally using the normal clamping action. Compared to the arrangement method, the effect of preventing damage caused by interference with other objects is enhanced.

Further, in the embodiment shown in FIGS. 7 and 8, the arm portion 10 is moved forward and backward by a hydraulic cylinder 22, and in this embodiment, the arm holder portion 11 at least moves the arm portion 10 backward and forward. The hydraulic cylinder 22 is formed into a rectangular cylindrical shape with a length that can completely accommodate the hydraulic cylinder 22, and the hydraulic cylinder 22 is supported via the cylinder brackets 1 to 24 while being housed in the arm holder part 11. The tip of the rod 23 is connected to the front flange 10c of the arm portion 10. Therefore, the arm portion 10 can be moved forward or backward by the telescopic operation of the hydraulic cylinder 22, and this embodiment is particularly effective in simplifying the structure.

Furthermore, although not shown, if the arm part 10 and arm holder part 11 are appropriately inclined so that the lower part of the arm part 10 and the arm holder part 11 are slightly inward, it becomes possible to grip the baggage more securely and prevent the baggage from slipping. It is advantageous for prevention.

Note that the means for moving the arm portion 10 forward and backward is not limited to the illustrated example, and can be changed in various ways as necessary. For example, a chain system can be changed to a wire rope system or a rack and pinion system, and a hydraulic system can also be changed to an electric system.

Furthermore, in the illustrated example, one clamp arm is moved forward and backward, but it is also possible to implement this method for both clamp arms. In that case, the cargo can be moved in either direction, and the cargo (Effects of the Invention) As detailed above, according to the clamp device of the present invention, it can be used with a length corresponding to the size of the device.
After the baggage is delivered to the designated location, it can be moved laterally as necessary, making it possible to stack the baggage against a wall or adjacent baggage without any gaps. This is particularly effective in containers where space is limited, and stowage is a great way to improve efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the invention, and FIG. 1 shows a crank. FIG. 2 is a perspective view of the retractable clamp arm with the arm retracted; FIG. 3 is a sectional view showing the drive unit for advancing and retracting the arm; FIGS. 4 and 5 6 is a perspective view showing another embodiment of the present invention, 7th is a perspective view showing still another embodiment of the present invention, and FIG. 8 is a plan view showing the operating mode, respectively. It is a sectional view taken along the line ■-■.

Claims (3)

[Claims] (1) In a clamp device equipped with a pair of left and right clamp arms that can be opened and closed on the front surface of an elevating member that moves up and down along the mast, the arm part of at least one of the left and right clamp arms is moved forward and backward relative to the rail part. A forklift clamp device that can move forward and backward in any direction. (2) Either the left or right clamp arm consists of a rail part, a short cylindrical arm holder part provided at the outer end of the rail part, and an arm fitted into the arm holder part so as to be movable back and forth. 2. The forklift clamping device according to claim 1, wherein the arm section is configured to move back and forth by a transmission mechanism such as a chain using a motor as a drive source. (3) Either the left or right clamp arm has a rail part, a rectangular cylindrical arm holder part provided at the outer end of the rail part and extending horizontally towards the rear, and a front and rear part of the arm holder part. According to claim 1, the arm part is movably fitted and has a groove-shaped cross section or a rectangular cross-section, and the arm part is moved back and forth by a cylinder horizontally arranged in the arm holder part. forklift clamping device.