JP2571335Y2 - Forklift clamping device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping device for a forklift, and more particularly to a clamping device of the type called a bale clamp.

[0002]

2. Description of the Related Art Generally, a clamp device of this type grips a load by a pair of left and right clamp arms mounted on a front surface of a clamp base so as to be movable in the left-right direction. Depending on the purpose of use, it may be preferable that the arm length be changed. For this reason, a clamp device capable of changing the length of the clamp arm has been proposed, and such a device is described in, for example, JP-A-2-106599. In the clamp device disclosed in the above publication, a movable pad is attached to a pair of left and right clamp arms so as to be movable in the front-rear direction, and the movable pad is moved back and forth by a hydraulic cylinder to change the arm length.

[0003]

However, since the clamping device described in the above-mentioned publication is a variable system using power using a hydraulic cylinder, the position of the movable pad can be changed by operation on the driver's seat. On the other hand, since the hydraulic cylinder itself is a considerably heavy object, there is a problem in that the weight of the entire apparatus increases and the allowable load of the vehicle decreases. Further, in actual cargo handling work, the frequency of changing the arm length is not so high.

Accordingly, the present invention has been made in view of the above-described circumstances, and has as its object to provide a clamp device having a simple structure capable of easily changing the arm length by hand and effective in reducing the weight. And technical issues to be solved.

[0005]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, the clamp device of the forklift according to the invention of claim 1 includes a pair of left and right clamp arms mounted on the front surface of the clamp base, and is disposed on the inner surface side of the clamp arm, and is disposed between the front and rear via a pair of front and rear links. A pair of left and right clamp pads mounted to be displaceable in
It is characterized in that the clamp pad is provided with a lock means capable of fixing the clamp pad at a displaced front side position and a rear side position.

According to a second aspect of the present invention, there is provided a forklift clamping apparatus according to the first aspect, wherein a plurality of pin mounting holes of one or both of the clamp arm and the link are arranged in parallel in the longitudinal direction. A mounting pin for connecting the clamp arm and the link is selectively replaceable with respect to the pin mounting hole.

[0007]

In the forklift clamping apparatus according to the first aspect of the present invention, the clamp pad is unlocked by the locking means, and then the clamp pad is displaced back and forth via the link, and then moved to the same position. The arm length can be changed to longer or shorter according to the purpose of use by fixing again by the locking means.

Further, in the forklift clamping apparatus according to the second aspect, the arm length can be changed by selectively replacing mounting pins with respect to a plurality of pin mounting holes formed in the clamp arm or the link. Can be expanded.

[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 perspective view of a clamp device according to the present embodiment. A clamp base 2 is vertically mounted on a front surface of a lift bracket 1 that moves up and down along a mast of a forklift (not shown). Two rail holders 3 each having a groove-shaped cross section are horizontally fixed to the upper and lower portions, respectively.

A pair of right and left clamp arms 4 are mounted on the rail holder 3 so as to be movable in the left and right directions. The two clamp arms 4 are opened and closed by being moved toward and away from each other by a clamp cylinder 5. ing.
The clamp arm 4 includes a rail 4a that is moved to the clamp holder 3 via guide rollers and side rollers (not shown), and an arm that is fixed to or integrally formed with the outer end of the rail 4a and that extends forward. 4b.

Thus, as shown in FIG.
Clamp pads 6 each having an inner vertical surface as a clamp surface are arranged on the inner surface side of b, and the pair of right and left clamp pads 6 can be moved in parallel to the arm portion 4b in the front-rear direction via a pair of front and rear links 7. Attached to.
As shown in FIG. 3, the arm portion 4b and the clamp pad 6 are formed in a box shape having a substantially vertical cross section.

The pair of front and rear links 7 are respectively disposed on the upper surface and the lower surface of the arm portion 4b, and one end thereof is attached to an upper plate of the arm portion 4b by a mounting pin 8, and the other end is attached to an upper plate of the clamp pad 6. Each is rotatably mounted by a mounting pin 9. As a result, the clamp pad 6 is moved from the shortened position shown in FIG.
And is secured by locking means in the displaced position.

The locking means is a U-shaped lock pin 10 having both ends bent, and a lock hole which is provided through the upper plate of the arm portion 4b and the upper plate of the clamp pad 6 and through which the lock pin 10 can be inserted and removed. In this embodiment, two lock pins 10 are set, and two lock holes 11 are respectively set for the shortened position and the extended position.

The clamp device of the present embodiment is constructed as described above, and when the lock pin 10 is pulled out from the lock hole 11, the clamp pad 6 is connected to the arm portion 4b.
, The arm length can be changed to either the long or short arm by moving the clamp pad 6 back and forth via the link 7 in this state. After the displacement of the clamp pad 6, the clamp pad 6 is fixed to the arm portion 4b by inserting the lock pin 10 into the lock hole 11. Therefore, according to the present embodiment, it is possible to easily change the arm length of the clamp arm 4 manually according to the purpose of use such as the type of luggage to be handled or the work place, and to adapt to the work.

Next, another embodiment of the present invention will be described with reference to FIGS. In this embodiment, the range of changing the arm length can be expanded. For this purpose, in this embodiment, a plurality of pin mounting holes 12 are arranged in the upper and lower plates of the arm portion 4b of the clamp arm 4 in the front-rear direction, and a plurality of pin mounting holes 13 are formed in each link 7. Are arranged side by side in the longitudinal direction, and the mounting pins 8 can be replaced with respect to the pin mounting holes 12 and 13.

More specifically, as shown in FIG. 6, a mounting pin 8 having a flange 8a formed at the upper end and a screw portion 8b formed at the outer periphery of the lower end is connected to the pin mounting hole 13 of the link 7 and the arm portion. In a state of being inserted from above into the pin mounting hole 12 of 4b, the double nut 14 screwed to the screw portion 8b prevents the pin from coming off. The other end of each link 7 is rotatably fitted to the mounting pin 9 on the clamp pad 6 side, and is prevented from falling off by the double nut 15. Although not shown, the lock pin and the lock hole are configured in the same manner as in the above-described embodiment.

Therefore, according to this embodiment, the pin mounting hole 12 of the arm 4b or the pin mounting hole 13 of the link 7 is provided.
The arm length of the clamp arm 4 can be changed by changing the rotation fulcrum of the link 7 by appropriately replacing the mounting pin 8 with respect to FIG. The case where a pin mounting hole 12 and a pin mounting hole 13 at an intermediate position of the link 7 are used is illustrated.
FIG. 5 shows the pin mounting hole 12 on the frontmost side of the arm portion 4b.
And the case where the pin mounting hole 13 at the end of the link 7 is used.

Next, still another embodiment of the present invention will be described with reference to FIG. This embodiment is a modification of the above-mentioned other embodiment in which the double nuts 14 and 15 prevent the mounting pins 8 and 9 from coming off. FIG. 7 shows a case where the present invention is applied to the mounting pin 8 on the upper surface side of the arm 4b. Is shown. That is, the bolt insertion hole 16
A strip-shaped stopper plate 16 having a is fixed. The mounting pin 8 penetrates the link 7 from above through the pin mounting hole 13 and the pin mounting hole 12 of the arm portion 4b.
And the upper surface of the arm portion 4b are in contact with each other.

On the other hand, a screw hole 17 is provided on the upper surface of the arm portion 4b.
The boss 17 provided with a is fixed. Then, the bolt 18 is screwed into the screw hole 17a of the boss 17 through the bolt insertion hole 16a at the end of the stopper plate 16, so that the mounting pin 8 is prevented from coming off the arm portion 4b.

In this embodiment, the mounting pin 8 is connected to the arm 4
Although the description has been given of the case where the mounting pin 8 is attached to the upper surface of the arm portion 4b, it can be applied as a retaining structure when the mounting pin 8 is attached to the lower surface of the arm portion 4b. Further, the present invention can be applied as a structure for preventing the mounting pins 9 on the upper and lower surfaces of the clamp pad 6 from coming off.

It should be noted that the present invention is not limited to the above-described embodiment, but may be implemented as follows by appropriately changing a part of the configuration without departing from the spirit of the present invention. (1) In the above-described embodiment, the case where the links 7 are provided on the upper and lower sides, respectively, has been described. (2) In the above-described embodiment, the case where the setting position of the link 7 is set up and down has been described. (3) In the above other embodiments, the plurality of pin mounting holes 12 and 13 are provided in both the arm 4b and the link 7, but the configuration may be such that only one of them is set. (4) In the above-described embodiment, the locking means is a replacement method of the illustrated lock pin 10, but the invention is not limited to this. For example, it may be changed to an engagement / disengagement operation method including a hook and a pin. Further, the lock pin 10 may be changed to a plate, and the system may be changed to a system in which both ends of the plate are bolted. If this system is changed, the plate may fall off even if the clamp device is turned upside down. Since there is no,
It can be used together with a cargo handling device that rotates the clamp device all the way. (5) In the other embodiments described above, the structure is such that the long-axis-shaped mounting pin 8 is penetrated in the vertical direction of the arm portion 4b and is prevented from falling off together with the link. However, the present invention is not limited to this. For example, the structure may be changed to a structure similar to the mounting structure of the short shaft-shaped mounting pin 9 to the clamp pad 6. Conversely, the mounting structure of the short-axis-shaped mounting pin 9 to the clamp pad 6 may be adopted as the mounting structure of the long-axis-shaped mounting pin 8 to the arm portion 4b.

[0022]

[Effect of the Invention] As described in detail above, according to the present invention,
It is possible to obtain the arm length of the clamp arm suitable for the purpose of use such as the type and size of the luggage to be handled or the loading place, and also to easily change the arm length by hand. As compared with the case of changing the length, the weight of the clamp device is reduced, and the allowable load of the vehicle can be increased.

[Brief description of the drawings]

FIG. 1 is a perspective view of a clamp device according to an embodiment of the present invention.

FIGS. 2A and 2B are plan views showing a manner of changing the arm length of the clamp arm, wherein FIG. 2A shows a shortened state and FIG.

FIG. 3 is a longitudinal sectional view showing a manner of attaching a clamp pad to a clamp arm.

FIG. 4 is a plan view showing an arm length changing mode according to another embodiment of the present invention, in which a solid line indicates a shortened state and a virtual line indicates an extended state.

FIG. 5 is a plan view showing an arm length changing mode according to another embodiment, in which a solid line indicates a shortened state and a virtual line indicates an extended state.

FIG. 6 is a longitudinal sectional view showing a manner of attaching a clamp pad to a clamp arm according to another embodiment.

FIG. 7 is a longitudinal sectional view showing a retaining structure of a mounting pin according to still another embodiment of the present invention.

[Explanation of symbols]

 2 ... Clamp base 4 ... Clamp arm 4a ... Rail part 4b ... Arm part 6 ... Clamp pad 7 ... Link 8,9 ... Mounting pin 10 ... Lock pin 11 ... Lock hole 12 ... Pin mounting hole 13 ... Pin mounting hole

Claims (2)

(57) [Scope of request for utility model registration] 1. A pair of left and right clamp arms mounted on the front surface of a clamp base, and a pair of right and left clamp arms respectively disposed on the inner surface side of the clamp arm and mounted to be displaceable in the front-rear direction via a pair of front and rear links. A clamp device for a forklift, comprising: a clamp pad as described above; and locking means capable of securing the clamp pad to a front position and a rear position where the clamp pad is displaced. 2. A plurality of pin mounting holes for one or both of the clamp arm and the link are provided in parallel in a longitudinal direction, and the plurality of mounting pins for connecting the clamp arm and the link are provided. 2. The forklift clamping device according to claim 1, wherein the mounting hole is selectively replaceable.