JPS6016636Y2 - Crane pulley device - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pulley device for a crane, and particularly to a technique for easily changing the number of wires to be hung.

(Prior art) In conventional crane pulley systems, when changing the number of wires, the wire is passed through the narrow, curved space between the pulley and the pulley frame, and then pulled out. Ta.

(Problem that the invention aims to solve) However, in this conventional technique, the wire was passed through a narrow space manually to change the number of hooks, which was time-consuming and very inefficient. Ta.

Moreover, especially in the case of pulley devices for small cranes, the above-mentioned space is so small that it is not possible to insert one's hand, and it is impossible to work on the wire without disassembling and removing the cable end fitting. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a pulley device in which the number of hooks can be changed without passing a wire through the narrow space between the pulley and the pulley frame.

(Means for Solving the Problems) The present invention is constructed as follows in order to solve the problems of the prior art.

In other words, a plurality of pulleys are pivotally supported on a single shaft horizontally suspended on a pulley frame at the tip of a crane boom, and the plurality of pulleys are located between the pulley at one end of the plurality of pulleys and the pulley frame, and are close to the pulley at the one end. a wire guide provided on the pulley frame, and a cable end stopper bracket provided on the pulley frame at a position offset toward the proximal end of the crane boom from the shaft, and the wire guide includes at least The pulley at the one end has an arcuate guide portion having a wire guide groove along the lower outer edge of the pulley at the one end, When the cable end of the wire that has been rotated is fixed to the cable end fixing bracket, the pulley and the sequential hook guide the wire to the side at the lower part of the pulley at one end and guide and hold it in the wire guide groove of the wire guide tool. A pulley device for a crane, characterized in that the cable end is connected to a cable end stopper bracket and fixed to the cable end stopper bracket.

(Function) With this configuration, the wire guide is attached to the pulley frame located between the pulley and the pulley frame and at the lower outer edge of the pulley, so the wire led out from the pulley can be hung on this wire guide and rotated. This allows one extra turn of wire to be hung around the pulley support shaft, so only a decimal number of wires can be hung.

In addition, the number of wires can be changed to multiple wires by simply pulling the wires that have been passed through the wire guide downward and passing them around the pulley on the hook block side, without passing through the pulley frame on the boom side.

(Example) An embodiment of the present invention will be described based on FIGS. 1 to 3.

1 is a crane boom, 2 is a pulley frame, 3at3b is a pulley,
4 is a shaft that supports the pulley; 5 is a cable end stopper bracket fixed to the pulley frame 2 at a position closer to the proximal end of the crane boom 1 than the shaft 4; 6 is a wire guide; It is attached to the pulley frame 2 located between the pulley 3a and the pulley frame 2 and at the lower outer edge of the pulley 3a.

This wire guide tool 6 has an external shape in which a ring-shaped metal fitting is divided into about 172 to 1n of circumference, and the curvature of the outer peripheral part 61 is approximately the same diameter as the curvature of the pulley 3a. Further, a wire guide groove 62 for guiding and holding the wire is cut in the outer peripheral portion 61.

The outer peripheral portion 61 and the wire guide groove 62 constitute a guide portion that guides the wire.

7 in the figure is a hook block, ? Numerals a and 7b are pulleys of the hook block 7, 8 is a wire, and 9 is a wire end stopper.

Figure 1 shows a state in which four wires are hung, and the wire 8 is connected to the pulley 3b,
The hooks are turned in the order of 7b, 3a, and 7a to fix the cable ends to the cable end fixing bracket 5.

Figure 2 shows the state in which two wires are hooked, and the wire 8 is connected to the pulleys 3b and 7.
After turning the hooks in the order of b and 3a, the cable is led out to the wire guide 6 side at the lower part of the pulley 3a, guided and held in the wire guide groove 62 of the wire guide 6, and the end of the cable is fixed to the cable end fixing bracket 5. are doing.

In this embodiment, in order to change from a four-wire hook to a two-wire hook, remove the cable end stopper 9 from the state shown in FIG. The wire 8 is removed, and the wire 8 is led out to the side in the lower part of the pulley 3a, and the cable end stopper 9 is reattached to the cable end stopper bracket 5 along the wire guide groove 62 so that the wire 8 is held in the wire guide tool 6. Then, the weight of the hook block 7 tensions the wires 8, resulting in a state in which two wires are hung as shown in FIG.

On the other hand, in order to change from 2 to 4 ropes, remove the cable end stopper 9 in the state shown in Figure 2, pull it out through the space below the pulley 7a of the hook block 7, and reinstall the cable end stopper bracket. 5, the wires 8 become four wires as shown in FIG.

Although the above embodiment has been described with reference to two pulleys, it is also possible to apply this to a pulley device for a crane with three or more pulleys.

(Effect of the invention) According to the invention, when replacing the wire hook, the cable end stopper 9
Since it is not necessary to pass the wire 8 through the narrow space between the pulley frame 2 and the pulleys 3a and 3b, the work can be done easily and quickly, which has a great practical effect.

[Brief explanation of the drawing]

Fig. 1 is a front view and a side view showing a state in which four wires are hung in the embodiment of the present invention, Fig. 2 is a front view and a side view showing a state in which two wires are hung in the same embodiment, and Fig. 3 is a wire FIG. 3 is a transparent perspective view of the guide tool. 1: Crane boom, 2: Pulley frame, 3: Pulley, 4: Axis,
5: Cable end fixing bracket, 6: Wire guide, 7: Hook block, 8: Wire, 9: Wire cable end fixing fitting.

Claims (1)

[Scope of utility model registration request] a plurality of pulleys pivotally supported on a single shaft suspended horizontally on a pulley frame at the tip of the crane boom; located between the pulley at one end of the plurality of pulleys and the pulley frame, and close to the pulley at the one end; comprising a wire guide provided on the pulley frame, and a cable end stop bracket provided on the pulley frame at a position offset toward the proximal end of the crane boom from the shaft,
The wire guide includes at least an arcuate guide portion having a wire guide groove along the lower outer edge of the pulley at the one end, and other pulleys other than the pulley at the one end, a hook block pulley, When the cable end of the wire that has been rotated is fixed to the cable end fixing bracket, the pulley at the one end and the successive hook guide the wire to the side in the lower part of the pulley at the one end, and guide the wire to the wire guide groove of the wire guide tool. What is claimed is: 1. A pulley device for a crane, characterized in that the cable is guided and held at a cable end to reach a cable end stop bracket, and the end of the cable is fixed to the cable end stop bracket.