JPH02106599A - Clamp device for fork lift - Google Patents

Abstract

PURPOSE:To increase a ratio between length during expansion and that during contraction and to reduce the size of a device as a sufficient function to load a cargo to a deep part and unload it from the deep part is maintained. CONSTITUTION:Each of crank arms 4R and 4L laterally movably mounted to the front of a clamp base 2 is formed mainly with a fixed arm 7, a moving arm 8, and a moving pad 9. A cylinder block is located between the moving arm 8 and the fixed arm 7, and a chain 13 having the one end coupled to the moving pad 9 and the other end coupled to the fixed arm 7 is stretched about a chain wheel 14 on the moving arm 8. Since expansion and contraction of the cylinder block results in expansion and contraction of the moving pad 9, grasping a cargo, which is increased two times as large as that of the cylinder block, the size of a device can be reduced as a sufficient function to load a cargo to a deep part and unload it from the deep part is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a clamping device for a forklift, and more particularly to a type of clamping device called a bail clamp.

(Prior Art) Conventional clamping devices of this type generally grip cargo with a pair of left and right clamp arms that are attached to the front of a clamp base so as to be movable in the left and right direction. With this method, it is difficult or impossible to load cargo into a recessed place where the clamp arm cannot reach, or to remove cargo from the back. Therefore, as a ramp device suitable for such back stacking and back-cutting work, a telescopic ramp device in which the left and right clamp arms can be moved back and forth by a hydraulic cylinder has been proposed. However, in the above-mentioned telescopic clamp device, the movement of the clamp arm is the same as the movement of the hydraulic cylinder serving as a means for moving it, so the arm length is determined by the conditions of back stacking. In other words, it is necessary to set the clamp arm considerably long in order to improve the ability to stack and cut back.As a result, the clamping device becomes larger and the turning ability deteriorates and the allowable load width decreases. Problems such as this arise. In addition, if the clamp arm is set long, it may not be able to pull the load to the base even in the most compacted state if the load is small, resulting in a lack of stability during transportation. become.

Therefore, in view of the above problems, the present invention aims to provide a clamping device for a forklift that can be downsized while ensuring the same back loading or recessing function as the conventional one.
That purpose.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides left and right fixed arms extending in the front and back direction that are attached to the front surface of the clamp base so as to be movable in the left and right directions, and A movable arm mounted so as to be movable in the front-back direction, a movable pad mounted on the inner surface of the movable arm so as to be movable in the front-back direction, a driving means for moving the movable arm back and forth, and a movable pad that moves the movable arm back and forth; The clamp arm of the forklift is constituted by an interlocking means for moving the movable pad in the same direction as the rIA.

(Function) The clamping device of the present invention has an extensible structure made up of three members: a fixed arm, a movable arm, and a movable pad. Therefore, when carrying out work of retrieving or stacking luggage, the movable arm is moved forward and backward by the driving means. When moved, the movable pad is moved in the same direction as the movable arm moves back and forth, so even if the total length when contracted is set to be relatively short, the movable pad can sufficiently enter deep places. Moreover, in the most contracted state, the movable pad moves to the base of the arm, making it possible to sufficiently pull even small items.

(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. 1 in the figure is a lift bracket that is moved up and down along the mast of a forklift, and this lift bracket 1
Two rail holders 3 each having a groove-shaped cross section are horizontally fixed to the upper and lower front surfaces of the clamp base 2 fixed to the front end of the clamp base 2 . A pair of left and right clamp arms 4R and 4L are attached to the rail holder 3 so as to be movable in the left and right direction.
Those clamp arms 4R, 4L are the clamp cylinder 5
They are individually moved by R and 5L.

Thus, the clamp arms 4R, 4L are fixed to or integrally formed with a rail part 6 which is attached to the rail holder 3 via a guide roller so as to be able to move left and right, and to the outer end of this rail part 6. Fixed arm 7 extending horizontally
, a movable arm 8 attached to this fixed arm 7 so as to be movable back and forth, and a movable arm 8 attached to this movable arm 8 so as to be movable back and forth (=1
It is configured to be extendable and retractable with a movable pad 9 that is cut out.

Specifically, the fixed arm 7 is composed of a pair of upper and lower bars each having a T-shaped cross section, and at least the base and tip of each are connected by a tie plate 7a that extends in the vertical direction. The movable arm 8 is composed of a pair of upper and lower rods having an H-shaped cross section, and a groove on the outside in the vertical direction is slidably fitted into the fixed arm 7, and the front and rear sides of the movable arm 8 are fitted on the outside in the width direction, respectively. They are connected to each other by a tie plate t-8a.Furthermore, the movable pad 9 is formed into a flat plate shape, is placed on the inner surface of the movable arm 8, and is formed on the outer surface thereof and extends in the front-rear direction. The movable arm 8 is slidably fitted into a vertically inner groove of the movable arm 8 via a pair of upper and lower rail portions 9a.

A drive device for extending and retracting the clamp arms 5R and 5L is disposed on the upper and lower movable arms 812X1. Telescopic cylinder 1, which is the source of illumination for the device
0 is arranged in parallel between the arms, one end of which is connected to the tie plate 7a on the base side of the fixed arm 7, and the tip of the piston rod 11 connected to the tie plate 8 on the front side of the movable arm 8.
Fixed to a! It is connected to the bracket 12. Further, chinos 13 as a means for moving the movable pad 9 in the same direction in conjunction with the forward and backward movement of the movable arm 8 are arranged in two rows along the upper and lower surfaces of the telescopic cylinder 10.

That is, the chino 13 has front and rear dien boilers 14 attached to the upper and lower portions of the rear tie plate 8a of the movable arm 8 and the upper and lower portions of the bracket 12, respectively.
At the same time, one end is connected to the tie plate 7a on the front side of the fixed arm 7 via a chain anchor 15, and the other end is connected to the rear of the outer surface of the movable pad 9 via a chain anchor 16. are connected.

The clamp device of this embodiment is constructed as described above, and therefore, when the telescopic cylinder 10 is telescopically operated as shown in the schematic operation diagram of FIG. The movable arm 8 moves forward or backward by 10 strokes, and the front or rear Cheno wheel 14 moves together with the movable arm 8, so the movable pad 9 moves forward or backward along the movable arm 8 via the Cheno 13. being moved backwards. The moving speed of the movable pad 9 at this time is twice that of the telescopic cylinder 10, and therefore the stroke is also 218. In other words, the left and right clamp arms 4
R and 4L are capable of expanding and contracting in two steps in the front and back direction, so they can easily perform so-called back stacking or recessing work, such as loading or unloading items into or out of a deep place on a shelf. be able to.

As mentioned above, the movement recess of the movable pad 9 during depth cutting work or IJ88% cutting work is twice that of the telescopic cylinder 10, so that it is possible to obtain the same depth cutting function as the conventional telescopic clamp arm. If set, the overall length of the clamp arms 4R, 4L will be significantly shortened as a result. Moreover, since the baggage is substantially gripped by the movable pad 9, the baggage gripped by the movable pad 9 is sufficiently pulled to the base of the arm by the contraction operation. Incidentally, normal general lamp work is performed with the clamp arms 4R, 4L in the most contracted state. In addition, the movable pad 9 of this embodiment
Since it has a simple structure, it can be easily replaced, and if necessary, it can also be easily developed into a curved pad or the like.

Next, other embodiments of the present invention will be described. In the example shown in FIG. 6, the movable arm 8 is made of a bar with a rectangular cross section, and the fixed arm 7 and the rail portion 9a of the movable pad 9
are each formed from a bar with a groove-shaped cross section and are fitted so as to be able to slide relative to the movable arm 8, and the chains 13 in the - row form a ring shape that is long in the front-rear direction with respect to the vertical plane. It has a hanging structure. on the other hand,
The example shown in FIG. 7 has exactly the same configuration as the embodiment shown in FIG. 6, except that the positional relationship between the fixed arm 7 and the rail portion 9a of the movable pad 9 is reversed. ing. The operation of the other embodiments configured as described above is similar to that of the previous embodiments, and it is possible to effectively carry out the work of stacking and retrieving baggage.

Although the present invention has been illustrated and described with reference to preferred embodiments, various modifications may be made without departing from the spirit of the invention. For example, the chain 13 can be changed to a similar belt or rope, and the movable arm 8 and movable pad 9 can be changed from a spinning type to a rolling type using rollers, and can also be used as a telescopic drive device. The cylinder 10 drives a hydraulic motor or an electric motor.
73 source, and may be a gear type device such as a rack and pinion that operates by converting rotational motion into linear motion, or a screw type device using a threaded rod and nut.

(Effects of the Invention) As detailed above, according to the clamp device of the present invention,
The length of the clamp arm in the front and back direction can be shortened while ensuring sufficient back and forth stroke required for deep stacking and depth removal work, improving maneuverability and increasing allowable load. On the other hand, when the arm length during contraction is set to the same length as before, it becomes possible to obtain a larger longitudinal stroke. In addition, when the arm is extended, the movable pad at the end of the arm grips the baggage.
The reduction action allows the load to be sufficiently pulled to the base of the arm, making it possible to carry the load in a stable manner.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view of the clamp device, FIG. 2 is a side view, FIG. 3 is a cross-sectional view taken along the line 1 of FIG. 1, and FIG. 4 is a cross-sectional view of FIG. FIG. 5 is an explanatory view showing a mode of operation, and FIGS. 6 and 7 are line sectional views showing other embodiments. 1...Lift bracket 2...Clamp base 4
R, 4L... Clamp arm 5R, 5L... Clamp cylinder 7... Fixed arm 8... Movable 7-arm 9...
・Movable pad 10... Telescopic cylinder 3... Cheno Applicant Toyota Automobile Co., Ltd. 1111% J Seisakusho agent Patent attorney Hidehiko Okada (3 others) + y? 7゛

Claims (1)

[Claims] Left and right fixed arms extending in the front-rear direction are attached to the front of the clamp base so as to be movable in the left-right direction, movable arms are attached to these fixed arms so as to be movable in the front-rear direction, and A forklift comprising a movable pad mounted so as to be movable in the front-back direction, a driving means for moving the movable arm back and forth, and an interlocking means for moving the movable pad in the same direction in relation to the back-and-forth movement of the movable arm. clamping device.