JPH03128898A - Raw device - Google Patents

Abstract

PURPOSE:To oscillate a ram along the inner surface of a hole and eliminate the risk of dragging and damaging a cargo by connecting a ram base to a lift bracket through an universal coupling in such a manner as to be capable of oscillating vertically and horizontally. CONSTITUTION:Even if a ram 12 is slightly obliquely inserted to the hole of a cargo, the ram 12 is moved along the inner surface of the hole, and never push nor move the cargo as it can be oscillated with an universal joint as the center. At the time of carrying running, a ram base 11 is restrained by a restraining means (hydraulic cylinder) 22, so that the shaking of the ram 12 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ram device for handling and transporting cylindrical cargo objects such as paper rolls and clay pipes.

[Prior Art] As shown in FIG. 5, for example, a conventional ram device includes a ram base 2 fixed to a lift bracket 1 of a forklift or the like, and a ram 3 fixed to the ram base 2 and extending straight ahead of the machine. The ram 3 is inserted into a hole in a cylindrical cargo object (not shown) to perform cargo handling and transportation work.

[Problems to be Solved by the Invention] In the conventional ram device as described above, the ram is a rigid body that cannot be bent and is fixed to the lift bracket so that it cannot swing. If the ram is inserted at an angle, the tip of the ram may push against the inner surface of the hole, dragging the cargo and causing damage. In particular, this tends to occur when the difference between the diameter of the load hole and the diameter of the ram is small.

Such interference between the ram and the load can be avoided by operating the machine so that the ram is parallel to the hole in the load, but this operation is relatively difficult and requires skill.

The present invention aims to solve such conventional technical problems.

[Means for Solving the Problem] In order to achieve the above object, the ram device according to the present invention has the following features:
a ram base attached to a lift bracket of the machine base; a ram fixed to the front surface of the ram base and extending forward;
a universal joint that connects the ram base to the lift bracket so that it can swing vertically and horizontally; and a spring means that is disposed between the ram base and the lift bracket and elastically supports the ram base with respect to the lift bracket. and means for restricting movement of the ram base.

[Function] In the above configuration, even if the ram is inserted into the hole of the cargo object at an angle, the ram can swing around the universal joint, so it moves along the inner surface of the hole and pushes the cargo object. It doesn't move. Furthermore, during transportation, the ram base is restrained by the restraining means, so that it is possible to prevent the ram from wobbling.

[Actual Travel Example 1] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the ram device 10 according to the present invention has a ram base 11 and a ram 12 fixed to the front surface of the ram base 11, as in the conventional structure.
The ram base 11 differs from the conventional one in that it is attached to a lift bracket 14 via a universal joint 13. To be more specific, a pair of horizontal plates 15 are fixed to the front surface of the flat lift bracket 14 above and below the lateral central part thereof, and a joint block 16 is installed between these horizontal plates 15. It is located. Coaxially extending projecting pins 17 are integrally formed on each of the upper and lower end surfaces of the joint block 16, and each projecting pin 17 is inserted into a hole in a corresponding horizontal plate 15. Therefore, the joint block 16 is connected to the protruding pin 17.
It can be rotated left and right around the axis. The joint blocks 16 are a pair of vertical plates fixed to the left and right sides of the vertical center of the back of the ram base 11.
-17, the vertical plate 17 and joint block 16 are connected together by a pin 18 extending laterally through them. Therefore, the ram base 11 swings vertically around the bottle 18.
The bottle 18 is prevented from being removed by a nut 19. With this configuration, the ram 1 fixed to the ram base 11
2 is able to swing vertically and horizontally using the universal joint 13 as a fulcrum.

Further, a compression coil spring 20 is fixed to the upper edge, lower edge, and center of the left and right side edges of the front surface of the lift bracket 14, and extends toward the front of the machine. It is in contact with a contact plate 21 fixed to the back surface. These compression coil springs 20 are adapted to hold the ram base 11 substantially parallel to the lift bracket 14 in an unloaded state in which no load is applied to the ram 12.

As described above, the ram base 11 is elastically supported by the compression coil spring 20, and is configured to compress when a relatively small force is applied to the tip of the ram 12, thereby allowing the ram 12 to swing. Therefore, the ram device IO of the present invention is provided with a restraint means for restraining the movement of the ram base 11 in order to prevent the ram 12 from wobbling during transportation or the like. There are many possible ways to restrain this, but
In this embodiment, a hydraulic cylinder 22 is used. That is, openings 23 are provided at each of the upper, lower, left, and right corners of the lift bracket 14, and the piston rod 24 of the hydraulic cylinder 20 extending from the openings 23 supports the back surface of the ram base 11 at four points. The hydraulic cylinder 20 is fixed to a support bracket 25 fixed to the back surface of the lift bracket 14. In addition, as shown in FIG. 3, four hydraulic cylinders 2
2 are connected in parallel and controlled by one control valve 26 so that they are operated simultaneously.

Next, a procedure for transporting a cylindrical cargo such as a roll paper using the ram device of the present invention having the above configuration will be described.

First, the running/steering system, lift cylinder, and tilt cylinder of the machine are operated to position the tip of the ram 12 near the front of the hole in the cargo object. Next, the position of the control valve 26 of the hydraulic cylinder 22 is changed, the piston rod 24 is retracted, the restraint of the ram base 11 is released, and the ram 12 is made swingable.

At this time, since the ram 12 is in an unloaded state, the ram base 11 is moved to the lift bracket 14 by the compression coil spring 20.
, and the ram 12 extends forward along the machine centerline. Next, the machine base is moved forward and the ram 12 is inserted into the hole of the cargo. At this time, if the ram 12 is not parallel to the axis of the hole but is inserted slightly obliquely, the tip of the ram 12 will come into contact with the inner surface of the hole, but since the ram 12 swings following the hole of the cargo, Don't push things around, Ram 12
The whole thing is inserted into the hole. When the insertion of the ram 12 is completed, the mast (not shown) that guides the lifting and lowering of the lift bracket 14 is tilted backward, and the lift bracket 14 is slightly raised to lift the cargo and release the left and right compression coil springs 20. As a result of this action, the ram 12 is positioned along the center line of the machine in the left and right lateral directions. After this, when the hydraulic cylinder 22 is operated to extend the piston rod 24, the ram base 11 is restrained, so there is no fear that the ram 12 will wobble, and normal cargo handling and transportation work becomes possible.

In the above embodiment, a compression coil spring is used as the spring means for elastically supporting the ram base, but other types such as leaf springs can also be used, and the number and mounting locations are also limited to those in the above embodiment. do not have. The same applies to the types and mounting locations of the universal joint and ram base restraint means. For example, as in the ram device 10' shown in FIG. 4, it is possible to arrange the universal joint 13' at the upper part between the ram base 11 and the lift bracket 14, but in that case,
The hydraulic cylinders 22 will be attached to the lift bracket 14 at two locations, one on the lower right and the lower left, and the compression coil springs 20 will be attached at three locations as shown.

[Effects of the Invention] As described above, according to the present invention, even if the ram is inserted into the hole of the cargo object at a slight angle, the ram swings along the inner surface of the hole, so that the object can be easily moved. There is no risk of damage caused by dragging. Therefore, the positioning of the ram with respect to the hole in the cargo object does not have to be done as accurately as in the past, so driving and cargo handling operations become extremely easy, and work efficiency is greatly improved.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the ram device according to the present invention, Fig. 2 is a plan view of the ram device shown in Fig. 1, and Fig. 3 is a hydraulic cylinder used in the ram device shown in Fig. 1. FIG. 4 is an exploded perspective view showing another embodiment of the present invention, and FIG. 5 is a perspective view showing a conventional ram device. In the figure,

Claims (1)

[Claims] a ram base attached to a lift bracket of the machine base; a ram fixed to the front surface of the ram base and extending forward;
a universal joint that connects the ram base to the lift bracket so that it can swing vertically and horizontally; and a spring means that is disposed between the ram base and the lift bracket and elastically supports the ram base with respect to the lift bracket. and means for restraining movement of the ram base.