JP2543550Y2 - Crane overwind prevention device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing overwinding of a wire hanging a hook of a crane.

[0002]

2. Description of the Related Art FIG.
This will be described based on FIG. In FIG. 3, the main hook 1 is hung by a traveling pulley principle by a main wire 3 which makes several round trips. The sub hook 5 is suspended by a sub wire. The parent wire 3 and the child wire 7 are respectively provided with overwinding prevention devices 9 and 11 for preventing the wires from being overwound.

[0003] These devices use a weight 13 through a wire.
Is suspended by another thin wire 15.
When the wires 3 and 7 are overwound, the weight 13 acts as a resistance so that the operator of the crane can recognize the overwound state.

[0004]

As described above, the child wire 7 is also provided with the overwinding prevention device 11, and the weight 13 is suspended by another wire 15 (FIG. 4).
The sub-hook 5 is suspended by one child wire 7, and since there are more 24 in the child wire 7, the sub-hook 5 and the child wire 7 rotate when the child wire 7 is wound up (FIG. 5). . With the rotation of the child wire 7, the weight 13 rotates with the friction, and another wire 15 suspending the weight 13 is entangled with the child wire 7.

When such entanglement occurs, when the child wire 7 is wound up or down, the child wire 7
A large frictional force is generated between the wire 15 and the wire 15, the wire 15 is pulled by a large force, and is severely cut. When this cutting occurs, there is a risk that not only the overwinding prevention device 11 will be broken, but also the slave wire 7 and the hook 5 will shake greatly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an overwinding prevention device for a crane which prevents the wire of the overwinding prevention device from being entangled with a wire for winding. And

[0007]

In order to achieve the above-mentioned object, the present invention provides a method for inserting a sub-hook into a weight member having a sub-hook suspended by a parent wire and suspended to prevent the child wire from being excessively wound. It is characterized in that not only holes to be inserted but also holes through which a parent wire is inserted are formed.

[0008]

In the weight member, not only a hole for inserting a child wire but also a hole for inserting a parent wire is formed. Even if each wire rotates, the parent wire becomes a stopper and the weight member itself does not rotate. . For this reason, it is possible to prevent a wire or a chain hanging the weight member from becoming entangled with the child wire or the parent wire.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a crawler crane 17, which is a 40-ton crane provided with a main hook 1 and a sub hook 5. The main hook 1 is suspended by a parent wire 3 on the principle of a moving pulley. The sub hook 5 is suspended by one child wire 7. A portion of the parent wire 3 fixed to the crane 17 is provided with an overwinding prevention device 9 similar to the conventional one. That is, in this portion, the parent wire 3 is inserted through the weight 13, and the weight 13 is suspended from the crane 17 by another wire 15.

The overwinding prevention device 11 for the sub-wire 7 has a weight member 19 which is long in the lateral direction. Four holes 21 are formed in the weight member 19, and the sub-wire 7 is inserted into the first end hole 21A (FIG. 2). The other three holes 21B, 21C, 21
The parent wire 3 is inserted through D. The weight member 19 has both ends suspended from the crane 17 by a chain 23.

The operation of this embodiment will be described below. Since the child wire 7 has 24 as in the conventional case, the child wire 7 and the sub hook 5 rotate as in the conventional case when the child wire 7 is wound up. At this time, even if the child wire 7 comes into contact with the hole 21A of the weight member 19 and gives a rotational moment to the weight member 19, the parent wire 3 is inserted through the other holes 21B, 21C, and 21D. The parent wire 3 serves as a stopper, and the weight member 19 does not rotate. Therefore, the chain 23 suspending the weight member 19 does not become entangled with the child wire 7 or the parent wire 3 as in the related art.

In this embodiment, the holes provided in the weight member 19 through which the wires are inserted are all round holes, and are provided along the wires having a circular cross section, so that the wires swing greatly. The situation can be prevented.

In this embodiment, the main wire 3 is suspended from the main hook 1 by the principle of a moving pulley, and there are four wires in appearance. In other embodiments, the number of wires is three or less, or five or more. No problem. In such other embodiments,
The number of holes formed in the weight member 19 is the number obtained by adding the number of appearances of the parent wire 3 and the number (one) of the child wires 7. It is not the chain 23 that suspends the weight member 19,
Other wires may be used.

[0014]

As described above, according to the crane overwinding prevention device of the present invention, not only the child wire but also the parent wire is inserted through the weight member, and even if the child wire or the parent wire is rotated, the weight member is rotated. The wire itself or the chain hanging the weight member can be prevented from becoming entangled with the child wire or the parent wire.
Therefore, it is possible to prevent the destruction or danger of the overwinding prevention device caused by entanglement as in the related art.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tip of a crane showing one embodiment of the present invention.

FIG. 2 is an enlarged view showing a main part of FIG.

FIG. 3 is a perspective view of a crane tip showing a conventional example.

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is a diagram showing a problem of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main hook, 3 ... Parent wire, 5 ... Sub hook, 7 ... Child wire, 9, 11 ... Overwind prevention device, 13 ... Weight, 15 ... Wire, 19 ... Weight member, 21 ... Hole, 23 ... Chain.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model 60-117392 (JP, U) Japanese Utility Model 63-154591 (JP, U) Japanese Utility Model 62-186894 (JP, U) Japanese Utility Model 52 78252 (JP, U) Fully open 1979-5586 (JP, U) Fully open 57-196094 (JP, U) Fully open, 58-144588 (JP, U) Fully open, 60-177197 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A main hook is suspended by a parent wire, and a sub hook is suspended by a child wire.
An overwinding prevention device for a crane, wherein not only a hole for inserting a child wire but also a hole for inserting a parent wire is formed in a weight member suspended for preventing overwinding of a child wire.