JPS582090Y2 - Pulley device for bending cable traction - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pulley device for pulling a cable at a bent part, which is attached to a bent part of a narrow route such as a manhole to facilitate cable pulling when laying or spanning a cable. .

Conventionally, in towing work for laying communication cables inside conduits, when pulling through manholes that exist at bends in the route, hard tubes are installed inside the manholes in order to route the cables along the bends. The metal wheel 10 consisting of a hook 11, an arm 12, and a pulley 13 as shown in FIG. 16, a pulley support 17 and a metal wheel 14 combined with four pulleys 18, or a rotating shaft 23 and a support base 2 as shown in FIG.
Measures were taken such as using a pulley 22 with a large radius provided at 4.

However, at the bend, in addition to the traction tension, a force is applied to the cable in the inward direction of the bend, so when a tube is used, there is a drawback that friction with the inner surface of the tube is large, making traction difficult.

Furthermore, in the metal wheel 10 shown in FIG. 1, since the radius of the pulley 13 is small, there is a risk that the cable will be damaged at this portion due to the bending radius being less than the allowable bending radius.

In addition, the metal wheel 14 shown in Figure 2 can be used to hit right angle targets if it is installed in the ideal optimal position, but this is extremely difficult at an actual construction site, so when it comes to a right angle manhole, the metal wheel 14 should simply be Since the cable is designed to pull the cable smoothly and not to bend the cable, there is a risk that the pulleys 18 at both ends may be damaged in the same way.

Furthermore, since this gold wheel was not structured so that two or more could be connected, it was difficult to use them side by side.

If the large pulley 22 shown in Figure 3 is installed in a narrow place such as inside a manhole, the working conditions will be poor, and the rather large disk itself will rotate, so it may be dangerous to use it in a narrow place. Ta.

In order to eliminate the drawbacks of the prior art, the present invention provides a pulley bearing element member whose both ends can be connected to each other in a single arc shape without direction ratio, and the pulley bearing element member has a plurality of pulley bearing element members that are connected along the circumference with different radii of curvature. A plurality of pulley bearing element members are connected according to the angle of bending, and the pulley bearing element member has a circumference having a radius that is equal to or slightly larger than the allowable bending radius of the cable. The above feature is that a pulley is installed in the pulley shaft hole over a length that exceeds at least one quarter of the circumference, and its purpose is to prevent the cable from making many sharp bends, such as inside a manhole, when the cable is pulled. The purpose is to pass through bends smoothly and without excessive bending.

The present invention will be explained based on the drawings.

゛Figure 4 shows a pulley device for cable traction at a bending section according to the present invention.

In the figure, 1 is a pulley, 2 is an annular pulley bearing member, 3 is a mounting bracket, 4 is an arm that supports the pulley bearing member 3, and 5 is a U-shaped cable with a small U-shaped engagement part at its tip. The falling-prevention fitting is shown.

The position where the bearing of the pulley bearing member 2 is provided is arranged on a circumference having a radius that is equal to or larger than the allowable bending radius of the cable (approximately 20 times the diameter of the cable).

Next, the order of use of the device of the present invention will be explained.

For installation, use the fittings 3 to properly fix the device along the bend of the cable installation route, and then attach the cable to the pulley bearing member 2.
The cable is passed along the pulley 1 that is attached to the cable, and a cable fall prevention fitting 5 is attached to prevent the cable from falling off.

Separate arm 4 by cutting off a part of one side of arm 4.
-1 and connect it to other parts with hinge 6.

When passing the cable through the pulley 1, raise the separation arm 4-1 upward and introduce the cable into the arm 4 from the side.
The engaging portion at the tip of the cable drop-off prevention fitting 5 is engaged with the edge of the pulley bearing member 2 to hold the cable.

With this structure, when the cable is towed along this device, even at right angles and sharper bends, the cable moves smoothly due to the pulleys 1 arranged on the circumference, and also allows It can pass through without experiencing excessive bends smaller than the bend radius.

For long bends, similar effects can be achieved by arranging a plurality of this devices.

Therefore, when towing a cable during cable installation, even if the cable includes a bent part such as a bent manhole that is sharper than a right angle, the cable can be easily pulled through.

Even in a narrow working environment such as inside a manhole, since the pulley bearing member 2 has an arc shape, it is easier to take up work space than the large pulley 22 shown in Fig. 3 inside a manhole where cables are crowded. Since the pulley bearing member itself does not rotate, it is also highly safe.

Note that 2' in FIG. 6 is used as the pulley bearing member 2 in FIG. 4.
If you use a bearing with holes provided along the circumference of different radii like this, you can change the radius of curvature by replacing the pulley.

As a result, it can be applied to cables with different allowable bending radii using pulleys of the same diameter, expanding the range of use.

The above description assumes that the pulley bearing member 2 is composed of one arcuate member 11.
1i! LL, and a shaft hole provided on the circumference with a different radius of curvature is shown in FIG.

FIG. 7 shows a pulley bearing member that can be applied to a wider range of applications.

FIG. 7 shows a pulley bearing member consisting of 92 pulley bearing element members each having a circumference of 174.

The pulley bearing material 9 has both ends 9-1, 9-2 with no direction ratio,
Connection flanges 9A and 9B are provided at the ends, and bolt holes are provided between the connection flanges of other pulley bearing element members so that they can be connected with bolts IOA and IOB.

The pulley bearing element member 9 has shaft holes 9C on the circumference with different radii of curvature.

Provide 9D.

As shown in Fig. 7, the circumferential direction of the pulley bearing element member 9 is made appropriately short, for example, 174 circumferences, and the required length can be obtained by connecting them according to the bending angle. In this case, each piece is light and small, making it extremely convenient to carry.

This device can also be used on a support stand to avoid undesirable vibrations when the cable passes through it, and the device may be configured to have a support stand integrated with the pulley bearing member of the device. is also valid.

The present invention is based on the above-mentioned structure, and in particular, in cable pulling work when laying or spanning cables in narrow spaces such as manholes, by placing the device of the present invention at the bent part of the route, it is possible to avoid excessive damage to the cable. Cables can be smoothly drawn through bends without bending.

Moreover, in this case, since the pulleys are arranged on the circumference, it can be applied to various types of bends, including right angles and even sharp bends, so it is possible to pull through and tow most of the bends included in a general route. As a result, long cables can be towed all at once, which is unprecedented, and the efficiency of laying and spanning operations can be improved.

Furthermore, since the device has a simple structure, it is easy to manufacture and handle, and it also produces excellent effects.

[Brief explanation of drawings]

Figure 1: Figure 2 is a perspective view and side view of a metal wheel conventionally used for cable laying and spanning, Figure 3 is a perspective view of a large pulley, and Figure 4 is a diagram of the device of the present invention. Front view, Figure 5 is a sectional view taken along the X-Y line in Figure 4, Figure 6 is an annular pulley bearing member with different radii of the present invention - an actual example, and Figure 7 is an actual example of the present invention - actual strength. The example shows a pulley bearing member consisting of circular arc-shaped pulley bearing element members with different radii of 1/4 of the circumference. 1: Small diameter pulley, 2: Annular pulley bearing member, 3: Mounting metal fittings, 4: Arm supporting the pulley bearing member 2, 5: Cable fall prevention fitting, 5: Pulley bearing members with different radii, 6 :Hinge, 7: Pulley shaft hole, 8: Nut, 9
: Pulley bearing element member, 9A, 9B : Connection flange,
IOA, 10B: Bolt.

Claims (1)

[Scope of utility model registration request] A pulley bearing element member is provided whose both ends can be connected to each other in a single arc shape without directionality, and the pulley bearing element member is provided with pulley shaft holes arranged along a circumference having different radii of curvature. A plurality of bearing element members are connected according to the angle of bending, and the pulley bearing element member is provided with at least a quarter circumference on a circumference having a radius that is equal to or slightly larger than the allowable bending radius of the cable. A pulley device for cable traction at a bent portion, in which a pulley is attached to the pulley shaft hole over a length exceeding the length of the pulley.