FI79284B - The gripper. - Google Patents

Description

1 79284

kahmarit

The invention relates to a grab according to the preamble of the claim, which is used for loading timber or other equipment mounted on a crane.

The previously known grapple 5 used for loading timber is as follows. A hydraulic cylinder that uses the jaws of the grab is mounted inside the body of the grab. The cylinder is attached at its ends to pivot lugs in the jaws, which transmit the movement of the cylinder to the jaws and pivot them. In order to obtain the simultaneous movement of the jaws 10, the jaws are connected to each other by a transmission rod which is articulated in the jaws in the lugs for this purpose. The jaws, on the other hand, are articulated to the body of the grab by means of the fastening lugs on the jaws. Due to the number of 15 lugs required in this structure, the grab is complex, laborious to manufacture and heavy. In addition, this type of grip. . ri requires a lot of maintenance due to many joints and dirty operating conditions.

A previously known solution is disclosed in FR patent publication 1: 20 in 1 299 233 (B 66 C 3/00). The grapple shown therein is intended for lifting soil and is equipped with two hydraulic cylinders and two transmission rods. As a result, its structure is even more complex than the timber grab described above.

It is an object of the present invention to provide a novel solution for the construction of a grab. The advantage of this grab compared to previously known solutions is its simple structure. The gripper does not require a separate transmission rod to control the movement of the jaws and the number of 30 lugs required is small. Due to this, the grab is made light and is inexpensive to manufacture.

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A further advantage of the grapple is the small number of joints exposed to its wear and the low need for maintenance. The structure of the grab according to the invention thus eliminates the drawbacks which appear in previously known grabs.

In order to achieve the above effects, the invention is characterized by the features set forth in the characterizing part of the claim.

The invention will now be described in detail with reference to the accompanying drawing. Figure 1 of the drawing shows a cross-section of the grab according to the invention seen from the side and Figure 2 seen from above.

A hydraulic cylinder 2 is mounted inside the grab body 1.

The hydraulic cylinder 2 is fixed in its central part to the body 1 of the grapple by means of pins 3,4 which are located in the oval holes 5,6 in the body 1.

The hydraulic cylinder 2 is provided with a through piston rod 7 with loops 8,9 at the ends.

The loops 8,9 are attached to the lugs 10,11, by means of which the movement of the piston rod 7 is transmitted to the jaws 12,13 of the grab.

The operation of the grapple is based on the movement of the piston rod 7 of the hydraulic cylinder 2, which opens and closes the jaws 25 12,13 of the grapple when the piston rod 7 is driven from one extreme position to another.

At the same time, due to the mounting method of the hydraulic cylinder 2, the hydraulic cylinder 2 and the piston rod 7 act as a pacemaker for the movement of the jaws 12,13 so that they turn simultaneously. Installation of hydraulic cylinder 2 with mounting pins

II

3 79284 3.4 in the oval holes 5.6 allows it to move in the up / down direction according to the movement of the jaws 12,13 so that the piston rod 7 does not bend.

In Figure 1 of the drawing, the jaws 12,13 of the grab are seen pre-5 in two different positions. When the piston rod 7 has been driven according to the figure to its left extreme position, the jaws 12,13 of the grapple are closed. In this case, the gripping cross-section of the grab jaws is at its smallest. Then, when from this position the piston rod 7 is driven to the right to its second extreme position, the jaws of the grapple 12,13 open to the position shown by the dotted line. In this position, the distance between the jaws 12,13 is at its maximum in the collection width.

In particular, it should be noted that the solution according to the invention is applicable to other types of grapples than those used for loading timber. In addition, it should be noted that the invention has been described above with reference to only one illustrative embodiment. With this. . however, it is not intended to limit the invention in any way to this example only, but the invention may vary within the scope of the appended claims.

Claims (1)

4 -79284 CLAIMS A gripper comprising a body (1), two jaws (12, 13) articulated to the body and a hydraulic cylinder (2) for moving the jaws, characterized in that the hydraulic cylinder (2) engages its through piston rod 5 (7) from the loops (8,9) at both ends to the pivot lugs (10,11) of the jaws (12,13) and to the oval holes (5,6) in the body of the grapple (1) by means of pins (3,4) in the middle of the hydraulic cylinder (2), which installation allows the hydraulic cylinder (2) to move up / down due to the turning 10 of the jaws (12,13) and allows the hydraulic cylinder to act as a pacemaker for the movement of the jaws. Il