JPH0324557Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a clamping device for a cargo handling vehicle to prevent an object from falling during gripping and transportation of an object such as a paper roll.

<Prior Art> In a conventional clamping device for a cargo handling vehicle, as shown in FIG. 4, a fixed clamp arm 2b is fixed to a rotary disk 1a of a rotating device 1 of a device main body A that can be raised and lowered to the vehicle main body. A movable clamp arm 2a is pivotally supported by a pin Bo so that it can be rotated to open and close, and both clamp arms 2a and 2b are operated to open and close by a cylinder C which is pivotally supported to a fixed clamp arm 2b by a pin B1. Gripping pieces 3a, 3b are provided at the tips of both clamp arms 2a, 2b, and the handling pieces D are secured by the gripping pieces 3a, 3b.
was holding.

<Problem to be solved by the invention> The above-mentioned clamping device is capable of grasping the objects D from large diameters to small diameters, but especially when grasping small diameter objects D, the center Do and Since there is a possibility that the line L connecting the centers of the gripping pieces 3a and 3b will deviate significantly, the rotating device 1
Rotating it may cause the cargo to fall.

Therefore, the present invention makes it easier for unskilled people to operate by applying a pressing force with an auxiliary arm to two-point gripping by a pair of clamp arms to bring the center of the object closer to the center line of the two-point gripping points. The aim is to provide a clamping device for cargo handling vehicles that can be used safely.

<Means for Solving the Problems> The means for solving the problems according to the present invention is as shown in FIGS. The movable clamp arm 2a is pivotally supported to be able to open and close in the direction toward and away from the fixed clamp arm 2b, and a drive cylinder C for opening and closing the movable clamp arm 2a is provided. A first gripping piece 3a and a second gripping piece 3b for gripping the cargo D are attached to the tip of the movable clamp arm 2a, and the first gripping piece 3a and the second gripping piece are attached to the fixed clamp arm 2b. An auxiliary arm 2c is rotatably supported to bring the straight line L connecting the auxiliary arm 2c and the center Do of the cargo D close to each other.
A pressing piece 3c for pressing small-diameter cargo is provided at the tip of c, and a link 4 is provided for interlocking the auxiliary arm 2c with the movable clamp arm 2a. Connecting pin B
The first connecting pin B6 is fixed to one of the link 4 and the movable clamp arm 2a. An elongated hole 6 is formed on the other side of the link 4 and the first connecting pin B6 to allow rotation of only the movable clamp arm 2a. A spring 5 is interposed therebetween to bias the baggage in the direction of separating it from the item D.

<Operation> According to the above problem solving means, small-diameter cargo D
When gripping the object D, the cylinder C is extended, the movable clamp arm 2a is rotated in the closing direction, and the object D is gripped.

At this time, the first connecting pin B6 is lowered by the closing rotation of the movable clamp arm 2a, and at the same time, the link 4 is also pushed downward. This allows the auxiliary arm 2
c rotates toward the object to be handled, and the pressing piece 3c pushes out the object D to the front. Therefore, the center Do of the object D is close to the straight line L connecting the first gripping piece 3a and the second gripping piece 3b. Therefore, even if the rotating device 1 is rotated in this state, the cargo D will not fall as in the conventional case.

In addition, when gripping a large-diameter object D, when attempting to grasp the large-diameter object D by extending the cylinder C and rotating the movable clamp arm 2a closed from the shortened state of the cylinder C, Only the movable clamp arm 2a rotates closed by the elongated hole 6, and while the first connecting pin B6 moves from the upper end to the lower end of the elongated hole 6, the link 4 does not move, and the auxiliary arm 2c remains tilted backward. There is even. Therefore, when gripping a large-diameter object during this period, there is no pressing force by the auxiliary arm 2c, and the straight line L connecting the gripping points of both clamp arms 2a and 2b is prevented from shifting from the center of the object Do. It can be prevented.

At this time, if the first connecting pin B6 is located in the middle of the elongated hole 6, the link 4 will fall under its own weight, the auxiliary arm 2c will hit the object D, and instead it will move straight into the straight line L.
There is a possibility that there is a significant deviation between the center Do and the center Do.

However, since the link 4 is pulled upward by the spring 5, the auxiliary arm 2c does not rotate toward the cargo and does not hit the cargo D. Therefore, the straight line L connecting the gripping points of the movable clamp arm 2a and the fixed clamp arm 2b and the center of the cargo
It can be supported at two points with the Do and Do in close proximity.

<Example> Hereinafter, an example of the present invention will be explained with reference to FIGS. 1 to 3. The clamping device for a cargo handling vehicle of this example is a device body A that is attached to a mast of the vehicle body so as to be able to move up and down. A device 1 is provided, a vertical part of an L-shaped fixed clamp arm 2b is fixed to the rotary disk 1a, and a base part of a movable clamp arm 2a is pivoted to the upper part of the fixed clamp arm 2b so as to be openable and closable by a pin Bo. There is. A fixed clamp arm 2 is located in the middle of the movable clamp arm 2a.
The tip of a cylinder C, which is pivotally supported by a pin B1 at the upper end of the cylinder C, is connected and driven to open and close by means of a movable clamp arm. And the movable clamp arm 2a
A first gripping piece 3a for gripping the cargo D on the upper side is pivotally supported at the tip of the handle.

Further, at the tip of the fixed clamp arm 2b, there is a second gripping piece 3 for gripping the article D on the lower side.
b is pivoted.

Then, at the lower part of the fixed clamp arm 2b, a straight line L connecting both the gripping pieces 3a, 3b and a center Do of the object D to be handled are made to be close to each other (including coincident with each other).
A central portion of the letter-shaped auxiliary arm 2c is rotatably supported by a pin B2. A pressing piece 3c for pressing small-diameter cargo is pivotally supported at the tip of the auxiliary arm 2c.

Note that the gripping pieces 3a, 3b and the pressing pieces 3c are rotatably supported by pins B3, B4, B5, respectively.

Further, at the base end of the movable clamp arm 2a and at the end of the auxiliary arm 2c opposite to the pressing piece 3c, a first connecting pin B6 and a second connecting pin B7 are provided so that the auxiliary arm 2c is interlocked with the movable clamp arm 2a. Link 4 is connected via. The first connecting pin B6 is the movable clamp arm 2a.
A first connecting pin B6 is fitted to the upper end of the link 4, and the first connecting pin B6 is fixed to the upper end of the link 4, allowing only rotation of the movable clamp arm 2a, and depending on the large diameter and small diameter of the cargo D. A long hole 6 is formed for moving the .

Further, a tension spring 5 is tensioned between the second connecting pin B6 and a part of the link 4 to bias the auxiliary arm 2c in a direction away from the object D.

Next, the operation will be described. As shown in FIG. 2, when gripping a small-diameter object D, the cylinder C is extended and the movable clamp arm 2a is rotated in the closing direction to grip the object D.

At this time, the first connecting pin B6 is lowered by the closing rotation of the movable clamp arm 2a, and at the same time, the link 4 is also pushed downward. This allows the auxiliary arm 2
c rotates around pin B2 toward the object to be handled, and the pressing piece 3c pushes out the object D to the front. Therefore,
The center Do of the object D is close to the straight line L connecting the first gripping piece 3a and the second gripping piece 3b. Therefore, even if the rotating device 1 is rotated in this state, the cargo D will not fall as in the conventional case.

Furthermore, as shown in Fig. 1, when gripping a large-diameter object D, the straight line L connecting the gripping points of both clamp arms 2a and 2b is generally close to the center of the object D. It is. Therefore, in this example, when grasping a large-diameter cargo object D, the auxiliary arm 2
I try not to use c.

That is, when gripping a large-diameter cargo object D,
First, from the state shown in FIG. 2, the cylinder C is shortened and the movable clamp arm 2a is rotated in the opening direction. Then, the first connecting pin B6 rises against the spring 5, the link 4 is also pulled upward by the spring 5, and the auxiliary arm 2C falls backward.

Furthermore, when the cylinder C is shortened, the link 4 is also pulled upward in conjunction with the opening rotation of the movable clamp arm 2a, and in the most open state, the first connecting pin B6 is attached to the length of the link 4 as shown in FIG. It will be located at the upper end of hole 6.

From this state, when an attempt is made to extend the cylinder C and rotate the movable clamp arm 2a closed to grasp a large-diameter cargo D, only the movable clamp arm 2a rotates closed due to the elongated hole 6. One connecting pin B6
While moving from the upper end to the lower end of the elongated hole 6, the link 4 is not interlocked and the auxiliary device 2c remains tilted backward. Therefore, when gripping a large-diameter object during this period, there is no pressing force by the auxiliary arm 2c, and the straight line L connecting the gripping points of both clamp arms 2a and 2b is prevented from shifting from the center of the object Do. It can be prevented.

At this time, if the first connecting pin B6 is located in the middle of the elongated hole 6, the link 4 will fall under its own weight, the auxiliary arm 2c will hit the object D, and instead it will move straight into the straight line L.
There is a possibility that there is a significant deviation between the center Do and the center Do.

However, since the link 4 is pulled upward by the spring 5, the auxiliary arm 2c does not rotate toward the cargo and does not hit the cargo D. Therefore, the straight line L connecting the gripping points of the movable clamp arm 2a and the fixed clamp arm 2b and the center of the cargo
It can be supported at two points with the Do and Do in close proximity.

As a result of the above, even an unskilled person can operate the machine safely.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, in the above embodiment, the first connecting pin B6 is fixed to the movable clamp arm 2a and the elongated hole 6 is formed in the link 4, but the first connecting pin B6 is fixed to the link and the elongated hole 6 is formed in the movable clamp arm 2a. Even if it is formed, the same effects as in the above embodiment can be achieved.

<Effects of the invention> As is clear from the above explanation, according to the present invention, since the auxiliary arm is provided, when gripping a small-diameter object, the auxiliary arm is activated to push the object and the fixed clamp arm is moved. The movable clamp arm can grip the object, and the straight line connecting the first gripping piece and the second gripping piece can be brought close to the center of the object, and the object can be dropped. You can work safely without any problems.

In addition, since the link and the movable clamp arm are connected using the elongated hole and the first connecting pin, the center of the object can be connected to the straight line connecting the gripping points of both clamp arms. When grasping large-diameter objects that can be brought close together,
Only the movable clamp arm can be closed and rotated, and the object can be gripped without operating the auxiliary arm.

Furthermore, since a spring is provided between the link and the first connecting pin to bias the auxiliary arm in the direction away from the cargo, even if the first connecting pin is in the middle position of the elongated hole, the spring will keep it longer. Since the link is moved to the end of the hole, it has the advantageous effect of preventing the auxiliary arm from coming into contact with and pushing the object due to its own weight.

[Brief explanation of the drawing]

Figure 1 is a side view of the embodiment of the clamping device for a cargo handling vehicle of the present invention when gripping a large-diameter object, Figure 2 is a side view of the same when gripping a small-diameter object, and Figure 3. 4 is an enlarged side view showing the movement of the pin at the upper end of the link when objects of large diameter and small diameter are gripped, and FIG. 4 is a side view of a conventional clamping device for a cargo handling vehicle. A: Device main body, B: Support main body, B1, B2, B
3, B4, B5, B6, B7: Pin, C: Cylinder, D: Cargo, 1: Rotating device, 1a: Turning plate, 2a, 2b: Clamp arm, 2c: Auxiliary arm, 3a, 3b: Gripping piece , 3: Pressing piece, 4: Link, 5: Spring, 6: Long hole.

Claims (1)

[Scope of utility model registration request] A fixed clamp arm is fixed to a rotary disk of a rotating device of the apparatus main body, and a movable clamp arm is pivotally supported to the fixed clamp arm so as to be able to open and close in a direction toward and away from the fixed clamp arm. A drive cylinder for opening and closing is provided, and a first gripping piece and a second gripping piece for gripping the cargo are attached to the tips of the fixed clamp arm and the movable clamp arm, respectively, and the fixed clamp arm has An auxiliary arm is rotatably supported for bringing the straight line connecting the first gripping piece and the second gripping piece close to the center of the object, and a small-diameter object is attached to the tip of the auxiliary arm. A pressing piece for pressing is attached, and a link is provided for interlocking the auxiliary arm with the movable clamp arm, and the link has one end connected to the movable clamp arm via a first connecting pin and the other end connected to the second movable clamp arm. The first connecting pin is fixed to one of the link and the movable clamp arm, and the first connecting pin is fitted to the other to allow rotation of only the movable clamp arm. 1. A clamping device for a cargo handling wheel, characterized in that a long hole is provided to accommodate the load, and a spring is interposed between the link and the first connecting pin to bias the auxiliary arm in a direction away from the cargo.