JPH02255495A - Roll clamp device of forklift - Google Patents

Abstract

PURPOSE:To surely clamp a roll at three points and to confirm the clamping condition by providing a long clamp arm formed by the second arm, the projection length of which is longer than that of the first arm and individually turning the first and second arms. CONSTITUTION:In case of clamping a roll R, a clamp pad 11 of a short clamp arm 5 is held to one side of the roll R, the second and third clamp cylinders 18, 22 are elongated to individually turn the first arm 6A round the fitting center of a clamp holder 4 inward and turn the second arm 6B round the fitting center of the first arm 6A inward, and clamp pads 14, 19 of the arms 6A, 6B are brought into contact with the roll R. Thus, the roll R is clamped surely and in a stable state from three directions by three clamp pads 11, 14, 19. Such a clamp work is using a three-point clamp can be confirmed from a driver's seat over a clamp holder 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a roll clamp device for a forklift used for handling roll-shaped articles (hereinafter simply referred to as rolls).

(Prior art) A roll clamp device, which is attached to the lift bracket of a forklift so that it can rotate about a horizontal axis via a rotating body, basically has two long and short clamps attached to a clamp holder fixed to the front of the rotating body. The clamp arms are installed facing each other so that they can be opened and closed, and when the clamp arms are opened and closed by a clamp cylinder, the roll is clamped by a pad attached to the tip of the arm.

By the way, in the case of the two-point lamp method using two wooden clamp arms as mentioned above, it is important to position the center of the O-ru on a straight line connecting the centers of both clamp pads in order to securely clamp the roll. This is the condition. However, positioning the clamp arm and clamping the roll so as to satisfy the above conditions relies solely on the intuition and skill of the operator, and therefore requires considerable skill and lacks certainty. It is. If the clamping method is inappropriate, there is a risk that the roll may fall during transportation.

Therefore, various proposals have been made to improve the problems of the two-point clamp type as described above.

One of them is to attach an auxiliary pad to the front of the clamp holder that can come into contact with the back of the roll, and clamp it at three points: two clamp arms and the auxiliary pad (
Alternatively, a movable auxiliary pad is provided on the front surface of the clamp holder that moves backward when the clamp arm opens and moves forward when the clamp arm closes. A device that is clamped (see Japanese Utility Model Application Laid-Open No. 62-105999) is known.

(Problem to be Solved by the Invention) However, in the case of the above-mentioned three-point lamp type roll clamp device, since the auxiliary pad placed on the front of the clamp holder is not visible at all from the driver's seat, the back of the roll is used as an auxiliary pad. It is difficult to confirm whether the roll is in a stable or ramped state in contact with the pad, and especially in the case of side grabbing, it is necessary to operate the vehicle or clamp arm effectively so that the back of the roll is in contact with the auxiliary pad. The problem was that this process itself was troublesome and had poor workability.

Therefore, in view of the above problems, the present invention is capable of reliably and easily clamping a roll at three points, and
It is an object of the present invention to provide a roll clamp device for a forklift that allows checking the clamp state.

(Means for Solving the Problems) In order to solve the above problems, the present invention is configured as follows.

In a roll clamp device including long and short clamp arms on the front surface of a clamp holder attached to a lift bracket, the long side clamp arm has a proximal end rotatably attached to the clamp holder. It is composed of a first arm and a second arm whose base end is rotatably attached to the first arm or the clamp holder and whose protrusion length from the front surface of the holder is longer than that of the first arm. The first arm and the second arm are individually rotated by a cylinder.

(Function) According to the roll clamp device of the present invention configured as described above, the three clamp arms, the short side clamp arm and the long side first arm and second arm, can move the roll in three directions. Since the clamp can be performed from the top, the clamp is reliable and stable, and the clamping operation can be performed while checking the contact of the pad against the roll from above the driver's seat.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings. As shown in the figure, a clamp holder 4 is attached to the front surface of a lift bracket 2 that is moved up and down along a mast 1 of a forklift so as to be rotatable around a horizontal axis via a rotating body 3. Clamp arms 5 and 6 are installed facing each other. The clamping device of this embodiment is a double-opening type, and the base of the shorter clamp arm 5 is rotatably attached to one side of the clamp holder 4 via a shaft 7, and one end is attached to the clamp holder 4 @ 8, and the other end of the clamp cylinder 1 is pivotally connected to the middle of the back surface of the clamp arm 5 by a shaft 9.
It is designed to be rotated by 0. A clamp pad 11 is attached to the inner surface of the tip of the clamp arm 5 via a shaft 12.

On the other hand, the longer clamp arm 6 is divided into two arms, a first arm 6Δ and a second arm 6B, approximately in the middle of its protruding direction, that is, the front-rear direction. The base of the first arm 6A is rotatably attached to the other side of the clamp holder 4 around a shaft 13, and its forward protrusion length is set to be slightly shorter than the short clamp arm 5. A clamp pad 14 is attached via a shaft 15 to the inner surface of the tip. The first arm 6A is rotated by a second clamp cylinder 18, which has one end pivotally connected to the clamp holder 4 through a shaft 16, and the other end pivotally connected to the tip of the first arm 6Δ through a shaft 17. It is designed to be moved.

The base of the second arm 6B is rotatably attached to the tip of the first arm 6A about a common shaft 17 with the second clamp cylinder 18, and protrudes forward by a considerable length. A clamp pad 19 is attached to the shaft 2 on the inner side.
It is attached via 0. The second arm 6B has one end pivotally connected to the clamp holder 4 via a common shaft 16 with the second clamp cylinder 18.1. The other end thereof is rotated by a third clamp cylinder 22 which is pivotally connected to the base end of the second arm 6B via a shaft 21.

That is, the long side clamp arms 6 are two arms 6A having different protrusion lengths from the front surface of the holder.

6B, and both arms 6A,
The clamp pads 14 and 19 of 6B and the clamp pad 11 of the short clamp arm 5 are arranged to form a triangle.

Further, the second clamp cylinder 18 and the third clamp cylinder 22 are connected in a parallel circuit as shown in the hydraulic circuit diagram of FIG. 4, and are operated simultaneously by one clamp switching valve 23. It has become. The first clamp cylinder 10 for the short clamp arm 5 is used for positioning the clamp arm 5 prior to clamping work, and the actual clamping work is performed using the first clamp cylinder 10 for the first arm 6A and the second arm 6B. This is done by actuating both the second and third clamp cylinders 18.22.

In the roll clamp device of this embodiment configured as described above, when clamping the roll R, the clamp pad 11 of the short clamp arm 5 is placed on one side of the roll R, and the clamp switching valve is turned on. 23, the second and third clamp cylinders 18 and 22 are respectively extended, the first arm 6A moves inward to the mounting center opening with respect to the clamp holder 4, and the second arm 6B moves inside the first arm 6B.
The clamp pads 14, 19 of each arm 6A, 6B contact the roll R by pivoting inwardly at the center of attachment to the arm 6A. At this time, roll R
Even if the timing of contact between both clamp pads 14.1 and 9 is shifted, the clamping force remains unchanged between both clamp pads 14.1.
9 comes into contact with the roll R, so the clamping of the roll R is not a problem. The roll R, which is thus clamped from three directions by the three clamp pads 11.14.19, has its center located within the triangle connecting the three clamp pads 11.14.19. Moreover, it is clamped in a stable state.

Further, since the clamping work using such a three-point clamp can be confirmed from the driver's seat over the head of the clamp boulder 4, appropriate ramping work can be easily performed.

In addition, even if the clamping position of the roll shifts slightly back and forth as shown in Figure 3 (a), (b), and (c), the arm shape will adapt to the clamp, and the roll R will be reliably clamped. .

The above-described clamping operation of the roll R can be performed in the same manner whether the roll R is clamped vertically or horizontally.

Although this embodiment has been described in the case where it is applied to a double-opening type roll clamp device, it is also possible to implement it to a single-opening type, that is, a type in which the short clamp arm 5 is fixed to the clamp holder 4.

Furthermore, in this embodiment, the second arm 6B of the long clamp arm 6 is attached to the tip of the first arm 6△, so that it is divided into two parts, front and back.
rotates with respect to the clamp boulder 4 on the same axis as the first arm or on a separate axis (it may also be configured to be attached to the TJ function).

(Effects of the Invention) As described in detail above, according to the present invention, by using the three-point ramp system using the clamp arm, rolls can be clamped reliably and stably.
Since the clamping method uses a book arm, the clamping status can be checked from the driver's seat, unlike conventional methods that use auxiliary pads, making it possible to perform clamping operations appropriately and easily. In addition to improving safety, accidents of rolls falling off during transportation due to inappropriate lamps are prevented, and safety is improved.

[Brief explanation of drawings]

The drawings show a practical example of the present invention, in which Fig. 1 is a side view of the roll clamp device, Fig. 2 is a perspective view showing the long side clamp arm, and Fig. 3 (a), (b), and (c) are FIG. 4 is an explanatory diagram showing the change in shape of the clamp arm when the clamp position of the roll shifts back and forth, and FIG. 4 is a hydraulic circuit diagram for the clamp cylinder. 2...Lift bracket 4...Clamp holder 5.6...Cran/arm 6A...First arm 6B...Second arm 6...Second clamp cylinder 9...Third clamp Cylinder

Claims (1)

[Claims] In a roll clamp device including long and short clamp arms on the front surface of a clamp holder attached to a lift bracket, the long side clamp arm is rotatably attached to the clamp holder at its base end. It is composed of a first arm, and a second arm whose base end is rotatably attached to the first arm or the clamp holder and whose protrusion length from the front surface of the holder is longer than the first arm. A forklift roll clamp device in which the second arm and the second arm can be individually rotated by a cylinder.