JPH0540289U - Overwind prevention device for crane - Google Patents

Abstract

(57) [Summary] [Purpose] In a crane 17 in which a main hook 1 is suspended by a parent wire 3 and a sub hook 5 is suspended by a child wire 7, a weight member suspended for preventing excessive winding of the child wire 7. It is possible to prevent an accident that the wire 19 that is hanging the weight member 19 or the chain 23 is entangled with the child wire as the child wire 7 rotates with the rotation of the child wire 7. [Constitution] Hole 21 for inserting child wire 7 into weight member 19
In addition, by forming the hole 21 through which the parent wire 3 is inserted, the weight member 19 itself is prevented from rotating.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for preventing excessive winding of a wire that suspends a hook of a crane.

[0002]

[Prior Art]

 A conventional overwinding prevention device for a crane will be described with reference to FIG. In FIG. 3, a main hook 1 is suspended by a parent wire 3 which reciprocates several times, on the principle of a moving pulley. The sub hook 5 is suspended by a child wire. The parent wire 3 and the child wire 7 are respectively provided with overwinding preventing devices 9 and 11 for preventing the wires from being overwound.

In these devices, a weight 13 through which a wire is passed is suspended by another thin wire 15. When the wires 3 and 7 are wound too much, the weight 13 acts as a resistance so that the crane operator can recognize the overwinding state.

[0004]

[Problems to be solved by the device]

 As described above, the child wire 7 is also provided with the overwinding prevention device 11 and the weight 13 is hung by another wire 15 (FIG. 4), but the sub-hook 5 is formed by one child wire 7. Since it is suspended and the child wire 7 has 24 more, the sub-hook 5 and the child wire 7 rotate when the child wire 7 is wound (FIG. 5). As the child wire 7 rotates, the weight 13 is accompanied by friction, and another wire 15 that suspends the weight 13 is entangled with the child wire 7.

When such entanglement occurs, a large frictional force is generated between the child wire 7 and the wire 15 when the child wire 7 is wound up and down, and the wire 15 is pulled with a large force. It will be cut off if it is very bad. If this cutting occurs, not only is the overwinding prevention device 11 damaged and destroyed, but there is a risk that the child wire 7 and the hook 5 will shake greatly.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide an overwinding prevention device for a crane that prevents the wire of the overwinding prevention device from being entangled with the wire that is being wound up. To aim.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a sub-hook hung by a parent wire, and a weight member hung to prevent the child wire from being overwound is provided with a parent wire as well as a hole for inserting the child wire. It is characterized in that a hole for insertion is also formed.

[0008]

[Action]

 The weight member has not only a hole for inserting the child wire but also a hole for inserting the parent wire. Therefore, even if each wire rotates, the parent wire serves as a stopper and the weight member itself does not rotate. Therefore, it is possible to prevent the wire or the chain that suspends the weight member from being entangled with the child wire or the parent wire.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a crawler crane 17, which is a 40t crane equipped with a main hook 1 and a subhook 5. The main hook 1 is suspended by the 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 that is 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 into the weight 13, and the weight 13 is suspended from the crane 17 by another wire 15.

The excessive winding prevention device 11 for the child wire 7 includes a horizontally long weight member 19. Four holes 21 are formed in the weight member 19, and the child wire 7 is inserted into the hole 21A (FIG. 2) at the first end. The parent wire 3 is inserted through the other three holes 21B, 21C and 21D. Both ends of the weight member 19 are suspended from the crane 17 by chains 23.

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

In this embodiment, all the holes provided in the weight member 19 through which the wire is inserted are round holes and are attached along the wire having a circular cross section, so that the wire swings greatly. You can prevent the situation.

In this embodiment, the parent wire 3 hangs the main hook 1 on the principle of a moving pulley, and there are four external wires, but in other embodiments, there are three wires or less, or five wires or more. It doesn't matter. In such another embodiment, the number of holes formed in the weight member 19 is equal to the number of the parent wires 3 in appearance and the number of the child wires 7 (one). Further, the weight member 19 may be suspended by the wire other than the chain 23.

[0014]

[Effect of the device]

 As described above, according to the crane over-winding prevention device of the present invention, not only the child wire but also the parent wire is inserted into the weight member, and the weight member itself is rotated even when the child wire or the parent wire is rotated. Therefore, it is possible to prevent the wire or the chain suspending the weight member from being entangled with the child wire or the parent wire. Therefore, it is possible to prevent damage or danger of the overwinding prevention device due to the entanglement as in the related art.

[Brief description of drawings]

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

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

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

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

FIG. 5 is a diagram showing a problem of the conventional technique.

[Explanation of symbols]

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

Claims (1)

[Scope of utility model registration request] 1. A main wire suspends a main hook, and a child wire suspends a sub hook.
An overwinding preventive device for a crane, characterized in that 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 excessive winding of a child wire.