JPS6038640Y2 - Clamping devices such as forklift trucks - Google Patents

Description

[Detailed description of the invention] The present invention relates to a roll clamp device mounted on a forklift truck, etc., and more specifically, at least one of a pair of opposing clamp pads is rotatably attached to a ramp arm, and the clamp The present invention relates to an improvement in a clamp device in which an object is held between two clamp pads by rotating an arm toward the other clamp pad using an actuating device such as a hydraulic cylinder.

Conventionally, in this type of clamp device, as shown in FIG. 1, for example, a base end portion of a clamp arm 2 having a clamp pad 1 pivotally attached to the tip end is attached to one end portion of a support arm 4 forming the main body of the device. The intermediate portion of the clamp arm 2 and the support arm 4 were connected by a hydraulic cylinder 3, and the support arm 4 was attached to the elevating member 6 via a rotating device 5.

Therefore, when the hydraulic oil passage to the hydraulic cylinder 3 is blocked, the clamp arm 2 is fixed to the support arm 4, but the support arm 4 is prevented from moving freely relative to the body of the forklift truck. Since the clamp arm 2 is attached in a fixed state, the clamp arm 2 ends up in the same state as if it were fixed to the vehicle body.

Therefore, as shown in FIG. 2, when the forklift truck is moved forward in the direction of arrow A toward the objects C1 lined up at regular intervals, and the clamp arm 2 is inserted between the objects C1, If the clamp arm 2 is improperly positioned, the clamp arm 2 or the clamp pad 1 will collide with the object C1 or the adjacent object C2 with a strong force, damaging the objects C1 and C2.

This damage is particularly severe when the conveyed objects C□ and C2 are relatively soft, such as roll paper.

It should be noted that such damage may also occur when the conveyed object is lowered to a predetermined location and then retreated, and the same situation applies to clamp devices having a structure other than that shown in FIG. 1.

This kind of damage can be prevented by keeping a sufficient distance between the conveyed objects C1 and C2 and always inserting the clamp arm 2 with the clamp arm 2 fully expanded, but in this case, the efficiency of using storage space will decrease. Put it away.

Therefore, in the past, the above-mentioned damage has been prevented by the skill of the driver to keep the distance between the transported objects as narrow as possible.
As a result, the driver's fatigue increases and work efficiency decreases, and the above-mentioned damage often occurs.

The present invention has been made with the aim of eliminating such drawbacks of the prior art, and is a clamp.

An arm and an arm actuating device for operating the arm,
Instead of being directly attached to the device body as in the past, it is attached via a swinging member that is pivotally attached to the device body, so even if the clamp arm etc. collides with the conveyed object, This is intended to prevent damage to the transported object by pivoting the clamp arm together with the swinging member inward or outward with a small force that does not damage the transported object.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIGS. 3 and 4, support pins 8 and 8 are shown at one end.
A pair of upper and lower clamp arms 2 to which a clamp pad 1 is pivotally attached. The base ends of the arms 2 are connected to each other by a connecting member 9, and are pivoted to one end side of the pair of upper and lower swing arms 11.degree. 11 by support pins 10.10.

Hydraulic cylinders 3, 3 having piston rods 3a, 3a connected to intermediate portions of the respective clamp arms 2, 2 are also pivotally mounted near the pin 10 of the swing arms 11, 11 by means of support pins 12,12.

One end side of both swinging arms 11, 11 is connected to each other by a connecting member 13 to constitute an integral swinging member, and the middle part is pivotally connected to the pair of upper and lower support arms 4 by support pins 14, 14. ing.

Since the support pin 14 is parallel to the support pin 10.12,
The swing arm 11 can swing in the same direction as the rotation direction of the clamp arm 2;
The swinging motion of the support arm 4 is controlled within a certain angular range by a pair of stoppers 15 and 20, which are erected on the surfaces of the support arm 4 facing the swinging direction of the swing arm 11 and constitute a stopper device. Limited.

On the other hand, on the other end side of the swinging arm 11, that is, on the side facing the support arm 4, a bracket 16 is erected at right angles as shown in FIG. It protrudes into the support arm 4 from the through hole 4a.

Spring support rods 17 and 17 are erected at right angles on both sides of the bracket 16 inserted into the support arm 4.
A coil spring 18 is fitted into each of the spring support rods 17,17.

One end of the coil spring 18.18 is in contact with the bracket 16, while the other end is in contact with a bracket 19.19 erected on the inner surface of the support arm 4.
is held in the intermediate position of the stopper 15, 20 by this elastic force.

Another clamp pad 21 is pivotally attached to the end of the support arm 4 opposite to the end on the side where the bin 14 is disposed by means of support pins 22,22.

The support arm 4 is integrally attached to a rotated body 23 that is rotated 360 degrees by a rotation device 5, and together constitutes the main body of the clamp device.
It is attached to an elevating member 6 that is moved up and down along the vertical axis.

Since the rotating device 5, the rotated body 23, the elevating member 6, etc. are well-known components, detailed explanations thereof will be omitted.

Since the clamping device of this embodiment is configured as described above, even when the hydraulic oil passage to the hydraulic cylinder 3 is blocked, when an external force is applied to the clamp arm 2, the arm 2 moves to the swing arm 11. At the same time, it can rotate by a certain angle using the pin 14 as a fulcrum against the elastic force of the coil spring 18.18.

Therefore, when inserting the clamp arm 2 between rolls of paper etc. arranged at regular intervals, the clamp arm 2
Even if the clamp arm 2 or clamp pad 1 comes into contact with the roll paper etc. due to poor positioning, the clamp arm 2 will rotate outward (counterclockwise in Figure 3) or inward with a relatively small force, and the roll will be removed. Will not damage paper etc.

Moreover, when clamping a roll paper or the like between the two clamp pads 1 and 21, the rotation of the swing arm 11 beyond a certain level is rigidly prevented by the stopper 15, so that the ramp force is sufficient as before. With this, you can clamp roll paper, etc.

The stopper 20 is provided to prevent the swinging arm 11 from rotating more than a certain amount in the clockwise direction in FIG. 3 when a large force is applied to the outside of the clamp arm 2 for some reason. However, it is also possible to replace this with a part of the rotated body 23 or the like.

Although the above embodiment is one of the preferred embodiments of the present invention,
The present invention is not limited to this, and various modifications are possible.

For example, as shown in FIG. 6, installing a roller 27 near the end of the swinging arm 11 and rolling it on the surface of the support arm 4 is effective in making the swinging movement of the swinging arm 11 light. It is.

Also, as shown in FIG. 7, coil springs 18.18
The adjustment bolt 31.31 is screwed onto the bracket 19.19 without directly contacting the brackets 19, 19.
If it is installed via a set load adjustment mechanism consisting of spring receivers 32, 32 etc. fitted to the stepped small diameter portions of the bolts 31, 31, the coil springs 18, 18 can be adjusted according to the breakage strength of the transported object. It becomes possible to adjust the set load.

Further, it is also possible to use an elastic body such as a comb, an air cushion, etc. in place of the coil spring 18. In other words, by interposing an elastic member between the swinging member and the main body of the device, the swinging arm 11 can be moved in place of the coil spring 18. elastically stopper 15.
It is sufficient to hold it at an intermediate position of 20.

Furthermore, the mechanism for rotating the clamp arm is not limited to a mere hydraulic cylinder as in the above embodiment, but it is also possible to use a link mechanism or the like in conjunction with the mechanism. It is sufficient to attach the entire operating mechanism to a swinging member, and to pivot this swinging member to a support member such as a support arm so as to be swingable in the same direction as the direction of rotation of the clamp arm.

As is clear from the above description, the present invention is such that at least one of a pair of clamp pads facing each other is attached to a lamp arm so as to be rotatable with respect to the device body, and the clamp arm is connected to the other clamp by an arm actuation mechanism. In a clamping device such as a forklift truck that clamps a conveyed object between both clamp pads by rotating toward the pad, a swinging member is rotated in the same direction as the rotation direction of the clamp arm throughout the device. The proximal end of the clamp arm is pivotally attached to the swinging member, and an arm actuation mechanism is provided between the clamp arm and the swinging member, and between the swinging member and the main body of the device. A stopper device is provided to limit the rotation of the swinging member to a certain angular range.

Therefore, even when the arm actuation mechanism is locked and the clamp arm is fixed to the swinging member, the clamp arm is not fixed to the device body or even the vehicle body, and the clamp arm or clamp pad accidentally collides with the conveyed object. Even when the clamp arm is moved, the clamp arm retracts with a relatively small force, and the conveyed object is not damaged.

Moreover, in the present invention, the swinging member is held at an intermediate position within the rotatable angle range by the elastic member when there is no load, so the swinging member can be rotated in both forward and reverse directions from this intermediate position. Therefore, the clamp arm attached to the swinging member can also rotate in both forward and reverse directions from its normal position. Damage to the conveyed object can be prevented both when the object collides with the clamp pad (on the side of the clamp pad) and from the outside.

Therefore, the positioning of the clamp arm does not require as much care as before, and even non-skilled workers can handle conveyed items that are lined up at close intervals, improving work efficiency and helping drivers Various benefits such as reduced fatigue are produced.

Another advantage of this invention is that even if the clamp arm, etc. collides with an object or other obstacle, a large impact force will not be applied to the clamp arm, arm operating mechanism, etc., which is an advantage in terms of strength. That's it.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a conventional clamp device, and FIG. 2 is a plan view for explaining the drawbacks of the clamp device shown in FIG. FIG. 3 is a plan view showing an embodiment of the present invention. FIG. 4 is a sectional view of TV-IV in FIG.
The figure is a sectional view taken along the line ■-■ in FIG. 3. FIG. 6 is a partial plan view of another embodiment of the present invention. FIG. 7 is a diagram corresponding to FIG. 5 in yet another embodiment of the present invention. 1゜21: Clamp pad, 2: Clamp arm, 3: Hydraulic cylinder, 4: Support arm, 5: Rotating device, 6: Lifting member, : Mast, 8゜10゜12゜14゜22: Support pin, : Swing Moving arm, 15.20: Stopper, 16: Bracket, 17:
Spring support rod, 18: coil spring, 19 nib bracket, 23: rotated body.

Claims (1)

[Claim for Utility Model Registration] At least one of a pair of clamp pads facing each other is attached to a lamp arm so as to be rotatable with respect to the device body, and the clamp arm is moved toward the other clamp pad by an arm operating mechanism. By rotating the
In a clamping device for a forklift truck or the like that clamps a conveyed object between both clamp pads, a swinging member is attached to the main body of the device so as to be rotatable in the same direction as the rotational direction of the clamp arm, and the swinging member is attached to the swinging member. The proximal end of the clamp arm is pivotally connected, the arm operating mechanism is disposed between the clamp arm and the swinging member, and the swinging mechanism is disposed between the swinging member and the device main body. A clamp device comprising: a stopper device that limits the rotation of a member to a certain angular range; and an elastic member that holds the swinging member at an intermediate position within the certain angular range when no load is applied.