JP7657419B2 - Wheel with entanglement prevention cover - Google Patents

Description

The present invention relates to a pulley with an anti-entanglement cover that prevents fingers from becoming entangled in the pulley on which the wire rope is attached.

In the construction and maintenance of electricity transmission towers, metal pulleys are frequently used in conjunction with wire ropes to pull materials and tools from the ground to high places. If a worker happens to come into contact with such a pulley while the rope is rotating, there is a risk that the worker's fingers or clothing may become entangled, leading to a serious accident. To prevent such an incident, various companies have proposed various prevention devices.

For example, in the pulley entrapment prevention device of Patent Document 1, an encircling tube 30 that encircles the rope is provided at the end of a connecting member 40 extending from the side plate 21 of the pulley 10. As another form, a configuration that includes a spiral member 51 that encircles the rope in a helical shape has also been proposed. Patent Document 1 claims that these configurations encircle the rope while following the movement of the rope, preventing the worker's fingers, etc. from becoming entangled in the pulley 11.

In addition, in the wheel safety cover of Patent Document 2, a rectangular cutout 2c through which a rope can be passed is provided in the bottom plate 2 of the safety cover 1 shown in Figure 2. Patent Document 2 claims that by passing the rope through the cutout 2c, it is possible to prevent the fingers of an operator from passing through and to prevent the fingers from getting caught in the wheel 10.

JP 2011-168386 A JP 2007-106517 A

However, the configurations of Patent Documents 1 and 2 allow the hands to easily touch the sheaves of the pulleys. This means that if, for example, a foreign object gets on the rope during a load-lifting operation and the worker tries to remove the object carelessly by hand, there is a risk that the hand's fingers will get caught between the rope and the sheaves.

To prevent fingers from getting caught, it is possible to enclose the rope ring with a cover. However, covering the rope ring with a cover makes it impossible to see the condition of the rope ring and the rope, which makes it difficult to detect problems such as foreign objects or metal fittings getting caught in the rope ring, or the rope falling off the rope ring.

The present invention aims to provide a pulley with an anti-entanglement cover that prevents fingers from getting entangled and allows the condition of the rope and the sling to be easily observed.

To solve the above problems, a typical configuration of a pulley with an anti-entrapment cover according to the present invention includes a frame, a rope ring journaled on the frame, and a plate-shaped anti-entrapment cover fixed to the frame along both end faces of the rope ring, the anti-entrapment cover being characterized in that its outer shape is larger than that of the rope ring and has a window provided at a position corresponding to the outer shape of the rope ring.

With the above configuration, covers larger than the rope are placed on both sides of the rope, preventing fingers from getting entangled. Furthermore, a window is provided at a position corresponding to the outer shape of the rope, making it easy to observe the condition of the rope and the rope.

It is preferable that the entrapment prevention cover is fitted with a transparent member that covers the window. The transparent member may be a flexible sheet or a hard plate.

The present invention provides a pulley with an anti-entanglement cover that prevents fingers from getting entangled and allows easy observation of the condition of the rope and the sling.

FIG. 1 is a diagram showing an outline of a pulley according to an embodiment of the present invention. FIG. 2 is a diagram showing the iron wheel disassembled into the iron wheel body and the entanglement prevention cover. FIG. 13 is a diagram showing the upper frame in an open state. FIG. 1 is a view of the pulley 100 from the rear side.

The preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific values shown in the embodiment are merely examples to facilitate understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid duplicated explanations, and elements not directly related to the present invention are not illustrated.

Figure 1 is a diagram showing an overview of the wheel 100 according to an embodiment of the present invention. Figure 2 is a diagram showing the wheel 100 disassembled into the wheel body 110, a front entrapment prevention cover (hereinafter referred to as "cover 200"), and a rear entrapment prevention cover (hereinafter referred to as "cover 250"). Figure 3 is a diagram showing the upper frame when opened. Figure 4 is a diagram showing the wheel 100 as seen from the rear side.

First, referring to FIG. 2, the pulley body 110 has a rope ring 140 rotatably supported by a front frame 120 and a rear frame 130. The frames 120 and 130 are pillars made of plate-shaped members. A groove 142 is formed on the outer periphery of the rope ring 140 for running the rope 260. A hook 150 is attached to the upper end of the frames 120 and 130.

The front frame 120 is divided into a lower frame 122 and an upper frame 124, which are connected by hinges 126. The hinges 126 are positioned at a position that corresponds roughly to the upper end of the rope ring 140. A lower plate 143 is attached to the lower frame 122, and an upper plate 144 is attached to the upper frame 124. A plate 141 is attached to the rear frame 130. These plates 141, 143, and 144 are provided to prevent the rope from getting tangled around the axis of the rope ring 140.

As shown in Figure 3, the upper frame 124 can be opened to allow the rope 260 to pass through the rope ring 140. A pulley that can open and close the frame to allow the middle part of the rope 260 to be hung, rather than passing the rope 260 through the end, is called a snatch pulley. The upper frame 124 is equipped with a bar 128, and the upper frame 124 is closed by passing the bar 128 through the latch 152 provided on the hook 150.

The front cover 200 and rear cover 250 are plate-shaped members that are fixed to the frames 120, 128 along both end faces of the rope 140 by welding, screwing, or the like. The front cover 200 is divided into a lower cover 202 and an upper cover 204, with the lower cover 202 fixed to the lower frame 122 and the upper cover 204 fixed to the upper frame 124. Therefore, as shown in Figure 3, the upper cover 204 opens and closes together with the upper frame 124.

As shown in Figures 1 and 4, the outer shape of the covers 200, 250 is larger than the outer shape of the rope ring 140. It is preferable that the difference in size is such that when a hand is placed on the edge of the covers 200, 250, the fingers cannot reach between the rope 260 and the groove 142.

In this way, covers 200, 250 larger than the rope ring 140 are placed on both sides of the rope ring 140, so that hands cannot easily touch the rope ring 140, and fingers can be prevented from getting entangled. Also, by providing large covers 200, 250, it is possible to make it difficult for the rope 260 to fall off the rope ring 140. Furthermore, if the covers 200, 250 were removable, they could come off during installation on site or during work, but by making them fixed, they can be used permanently.

The covers 200, 250 are also provided with windows 206, 256 at positions corresponding to the outer shape of the rope ring 140. This makes it possible to easily observe the state of the rope ring 140 and the rope 260 through the windows 206, 256, as shown in FIG. 1. The windows 206, 256 also serve to remove excess material from the covers 200, 250, making them as lightweight as possible without compromising their strength.

It is also preferable that the covers 200, 250 are provided with transparent members 206a, 256a that cover the windows 206, 256. The transparent members may be flexible sheets such as vinyl materials, or hard plates such as acrylic panels. This makes it possible to prevent fingers from being inserted through the windows and getting caught without impairing visibility.

Although the preferred embodiment of the present invention has been described above with reference to the attached drawings, it goes without saying that the present invention is not limited to such an example. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

The present invention can be used as a pulley with an anti-entanglement cover that prevents fingers from becoming entangled in the pulley on which the wire rope is attached.

100...wheel, 110...wheel body, 120...frame, 122...lower frame, 124...upper frame, 126...hinge, 128...hook, 130...frame, 141...plate, 140...sling, 142...groove, 143...lower plate, 144...upper plate, 150...hook, 152...hook holder, 200...cover, 202...lower cover, 204...upper cover, 206...window, 206a...transparent member, 250...cover, 256...window, 256a...transparent member, 260...rope

Claims (1)

A frame,
A rope ring journaled on the frame;
A plate-shaped anti-entanglement cover is fixed to the frame along both end faces of the rope,
The entanglement prevention cover has an outer shape larger than that of the rope ring, and is provided with an arc-shaped window corresponding to the outer shape of the rope ring ,
The winding wheel with an anti-entrapment cover is characterized in that the windows are provided symmetrically on both sides of the anti-entrapment cover along both sides of the rope ring and on both sides of the center of the rope ring .

Images