Extension Golden Ox

Abstract

To provide a wire-drawing metal cart capable of suppressing slack in a cable already drawn between electric poles when performing cable drawing work between electric poles. [Solution] The wire pulling trolley 1 comprises a housing 2, a lower wheel 4 that is rotatably supported by the housing 2 and supports the newly installed communication cable so that it moves the newly installed communication cable as it rotates while the newly installed communication cable is hung on it, a ratchet mechanism 7 that is provided on the housing 2 and the lower wheel 4 and restricts the lower wheel 4 to rotate in only one direction, and a hanging means 5 that is provided on the housing 2 and hangs the housing 2 from an attachment target.

Description

[Technical field]

[0001] The present invention relates to a wire pulley. [Background technology]

[0002] A method of extending a new communication cable along an existing communication cable involves attaching multiple wire-drawing metal cars to the existing communication cables or utility poles, and then pulling the new communication cable onto these wire-drawing metal cars. For example, Patent Document 1 discloses a wire-drawing metal car that includes a wheel on which the new communication cable is hung, a support member that rotatably supports the wheel, and a hook that is provided on the support member and attached to the existing communication cable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Microfilm of Utility Model Application No. 58-188926 (Utility Model Application No. 60-96913) Summary of the Invention [Problem to be solved by the invention]

[0004] The wire-drawing cart of Patent Document 1 has a problem in that when the tension of the new communication cable is loosened to facilitate the wire-drawing work between utility poles, the slack of the new communication cable already drawn between other utility poles increases. For ease of understanding, an example will be described with reference to a specific example in Fig. 8 in which the wire-drawing work of a new communication cable has already been completed between certain utility poles, and the wire-drawing work is to be carried out between adjacent utility poles.

[0005] If the span between certain utility poles is longer than the span between adjacent utility poles, the new communication cable between the certain utility poles will be heavier than the new communication cable between the adjacent utility poles by the amount of its length. If the new communication cable is loosened in this state, taking into account the efficiency of the cable-extending work, the new communication cable between the adjacent utility poles may move toward the center due to its weight, as shown in Figure 8, causing a large slack in the new communication cable already extended between the utility poles. This problem exists not only when extending a communication cable, but also when extending other cables.

[0006] The present invention has been made against this background, and has an object to provide a wire-drawing metal cart that is capable of suppressing slack in a cable that has already been drawn between other utility poles when performing cable-drawing work between utility poles. [Means for solving the problem]

[0007] In order to achieve the above object, the wire pulling car according to the present invention comprises: Housing and a first wheel that is rotatably supported by the housing and supports the cable so as to move the cable as the first wheel rotates with the cable hung thereon; a second wheel that is rotatably supported by the housing and supports the cable so as to move the cable as the second wheel rotates while sandwiching the cable together with the first wheel; a rotation restricting means provided on the housing and the first wheel for restricting the first wheel to rotate in only one direction; a hanging means provided on the housing for hanging the housing on an attachment target; Equipped with The housing includes a pair of plate-like members spaced apart from each other, and a pair of support members connected to upper and lower ends of each of the plate-like members, The second wheel is supported so as to be capable of translational movement toward the first wheel by having both ends of the rotation shaft thereof guided by the respective guide grooves formed in the respective plate-like members, and the second wheel is provided with a biasing means for biasing the first wheel and the second wheel so as to approach each other. do. Effect of the Invention

[0008] According to the present invention, it is possible to provide a wire-drawing metal cart that is capable of suppressing slack in a cable that has already been drawn between other utility poles when performing cable-drawing work between utility poles. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view showing a configuration of a wire pulley according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a front view showing the configuration of a wire pulling wheel according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a side view showing the configuration of a wire pulley according to an embodiment of the present invention. [Figure 4] FIG. 1 is a diagram showing the state of laying a new communication cable. [Diagram 5] FIG. 2 is a diagram showing a state of wire-drawing work using a wire-drawing cart according to an embodiment of the present invention. [Figure 6] FIG. 11 is a side view showing the configuration of a wire pulley according to a modified example of the present invention. [Figure 7] FIG. 13 is a front view showing the configuration of a wire pulley according to another modified example of the present invention. [Figure 8] FIG. 1 is a diagram showing the state of wire-drawing work for a new communication cable using a conventional wire-drawing metal car. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a wire pulley according to an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the same or equivalent parts are given the same reference numerals. In the embodiment, a communication cable installed between utility poles is used as the cable.

[0011] The wire-drawing metal car according to the embodiment is a pulley that supports the new communication cable so that the cable can move with rotation while being suspended from an attachment object, and is configured to restrict the direction in which the new communication cable moves to one direction. The attachment object to which the wire-drawing metal car according to the embodiment is attached is, for example, a utility pole, and in particular, it is preferable to attach the wire-drawing metal car according to the embodiment to a step bolt or overhead wire fitting of the utility pole. The wire-drawing metal car according to the embodiment can prevent the new communication cable from moving between other utility poles even if the tension of the new communication cable is released during the work of extending the new communication cable between utility poles, and as a result, can prevent slackening of the new communication cable that has already been extended between other utility poles.

[0012] Hereinafter, the configuration of a wire pulling trolley 1 according to an embodiment will be described with reference to Fig. 1 to Fig. 3. As shown in Fig. 1, the wire pulling trolley 1 includes a housing 2, an upper wheel 3 rotatably supported by the housing 2, a lower wheel 4 rotatably supported by the housing 2 and rotating in only one direction while pinching a new communication cable together with the upper wheel 3, and a suspending means 5 supported on both ends of the housing 2 that face the direction in which the upper wheel 3 and the lower wheel 4 are arranged, and suspending the housing 2 from a utility pole. The lower wheel 4 and the upper wheel 3 are examples of a first wheel and a second wheel, respectively, and are biased by a coil spring 6 in a direction approaching each other.

[0013] The housing 2 includes a pair of plate-like members 21, 22 arranged at a distance from each other, a pair of support members 23, 24 extending in a direction perpendicular to each of the plate-like members 21, 22 and connected to the upper and lower ends of the plate-like member 21 to support the hanging means 5, and four connection means 25 for detachably connecting the upper and lower ends of each of the plate-like members 21, 22. The pair of support members 23, 24 are fixed to different positions on the inner surface of the plate-like member 21, and the plate-like member 22 is configured separately from the pair of support members 23, 24. The plate-like member 21 is fixed to each of the support members 23, 24 by, for example, welding.

[0014] The plate-like members 21, 22 are plate-like members extending in the direction in which the upper wheel 3 and the lower wheel 4 are arranged. The plate-like member 21 rotatably supports one end of the rotation shaft 3a of the upper wheel 3 and the rotation shaft 4a of the lower wheel 4, and the plate-like member 22 rotatably supports the other end of the rotation shaft 3a of the upper wheel 3 and the rotation shaft 4a of the lower wheel 4. The plate-like members 21, 22 are formed with guide grooves 21a, 22a that extend in the longitudinal direction and guide the rotation shaft 3a of the upper wheel 3. The guide grooves 21a, 22a support both ends of the rotation shaft 3a rotatably and translationally along the guide grooves 21a, 22a.

[0015] One end of the support member 23 is connected to the inner surface of the upper end of the plate-shaped member 21, and the other end of the support member 23 is in contact with the inner surface of the upper end of the plate-shaped member 22. One end of the support member 24 is connected to the inner surface of the lower end of the plate-shaped member 21, and the other end of the support member 24 is in contact with the inner surface of the lower end of the plate-shaped member 22. When the plate-shaped members 21, 22 and the support members 23, 24 are combined with each other, the upper ends of the plate-shaped members 21, 22 have portions that protrude upward beyond the support member 23, and the lower ends of the plate-shaped members 21, 22 have portions that protrude downward beyond the support member 24.

[0016] The connection means 25 are connected in pairs to the portions of the plate-like members 21 and 22 that protrude upward beyond the support member 23 and to the portions of the plate-like members 21 and 22 that protrude downward beyond the support member 24, with the portions being spaced apart from each other. The connection means 25 includes a cylindrical spacer 25a, a bolt 25b inserted into the spacer 25a, and a nut 25c fastened to the bolt 25b. The spacer 25a is formed so that both ends thereof come into contact with the inner surfaces of the plate-like members 21 and 22.

[0017] A pair of through holes through which the bolts 25b can be inserted are provided in the portions of the plate-like members 21 and 22 that protrude above and below the support member 23. The bolts 25b are inserted into the through holes of the plate-like members 21 and 22 and into the spacer 25a, and the pair of connecting means 25 are detachably attached to the upper and lower ends of the plate-like members 21 and 22, respectively, by fastening the bolts 25b with nuts 25c. Therefore, by loosening the nuts 25c fastened to the bolts 25b and removing the four connecting means 25 from the pair of plate-like members 21 and 22, the housing 2 can be separated into a member composed of the plate-like member 21 and the support members 23 and 24 and the plate-like member 22.

[0018] The upper wheel 3 is a wheel that presses the new communication cable toward the lower wheel 4. A non-slip rubber member is attached to the peripheral surface of the upper wheel 3, and the cross-sectional shape of the non-slip rubber member is formed in a convex shape. For example, the peripheral surface of the upper wheel 3 is provided with a convex portion having an arc-shaped cross section.

[0019] The lower wheels 4 are wheels that support the newly installed communication cable from below and regulate the movement of the newly installed communication cable. A non-slip rubber member is attached to the peripheral surface of the lower wheels 4, and the cross-sectional shape is formed in a concave shape so as to guide the newly installed communication cable. For example, the peripheral surface of the lower wheels 4 is provided with a concave portion having an arc-shaped cross section. The lower wheels 4 are formed to have a larger diameter than the upper wheels 3 that face each other across the newly installed communication cable.

[0020] The upper wheel 3 and the lower wheel 4 are provided with rotating shafts 3a and 4a. Both ends of the rotating shaft 3a are supported rotatably and translationally in the guide grooves 21a and 22a of the plate-like members 21 and 22, and both ends of the rotating shaft 4a are rotatably supported in the through holes of the plate-like members 21 and 22. Both ends of the rotating shafts 3a and 4a protrude outward from the plate-like members 21 and 22, and a coil spring 6 that biases the upper wheel 3 toward the lower wheel 4 is attached to each of the protruding portions. The coil spring 6 is an example of a biasing means that biases the upper wheel 3 toward the lower wheel 4. Both ends of the rotating shafts 3a and 4a are provided with flanges that prevent the coil spring 6 from coming off.

[0021] The housing 2 and the lower wheel 4 are provided with a ratchet mechanism 7, which is an example of a rotation restricting means for restricting the rotation of the lower wheel 4 in only one direction. The ratchet mechanism 7 includes a gear 7a supported on the rotating shaft 4a of the lower wheel 4, and a pawl member 7b whose base end is supported on the inner surface of the plate-like member 22 of the housing 2 and whose tip end deforms while contacting the teeth of the gear 7a. The central axis of the rotating shaft 4a and the gear 7a coincide with each other.

[0022] 2, the gear 7a has multiple teeth with one tooth surface inclined toward the tangent line and the other tooth surface facing radially. The claw members 7b are arranged to extend radially of the gear 7a and are configured to overcome one tooth surface while deforming when the gear 7a rotates in one direction and to bite into the other tooth surface when the gear 7a rotates in the opposite direction.

[0023] The hanging means 5 is, for example, a round hook. The round hook extends in the longitudinal direction of the plate-like members 21, 22 and is provided on each of the support members 23, 24 so as to be spaced apart from the support members 23, 24. The round hook is hung on a step bolt of a utility pole or a metal fitting for a power line using, for example, a rope or a carabiner. The above is the configuration of the wire pulling car 1.

[0024] Next, a flow of a method for extending a new communication cable using the wire-extending metal cart 1 according to the embodiment will be described. In the operation of extending a communication cable, first, as shown in Fig. 4, multiple wire extension metal carts A are attached at intervals to an existing communication cable that is installed between a pair of target utility poles, and wire extension metal cart 1 is attached to the target utility pole to which the new communication cable will reach. Each wire extension metal cart A is provided with a freely rotatable wheel. The wire extension metal cart 1 is attached so that the towing rope and the new communication cable do not move toward the target pair of electric wires. In addition, the wire extension metal cart 1 and each wire extension metal cart A are attached to the existing communication cable with a towing rope that is lighter than the new communication cable hung thereon.

[0025] Once the installation of wire pulling car 1 and all wire pulling cars A has been completed, the end of the towing rope placed on wire pulling car 1 and wire pulling car A is connected to the end of the new communication cable on the ground, and the towing rope is pulled so that the end of the new communication cable reaches the target utility pole. Next, the tension on the towing rope is released and the drum is moved to the side of the adjacent utility pole, and the same procedure is used to perform the wire pulling work of the new communication cable between the adjacent pair of utility poles.

[0026] At this time, because the new communication cable extending between the target pair of utility poles is set on the wire-drawing cart 1, even if the tension of the towing rope is released, the new communication cable cannot move in a direction approaching the area between the target two utility poles, as shown by the arrow in Figure 5. This makes it possible to prevent the new communication cable extending between the target electric wires from slackening downward. In addition, because the new communication cable can move in a direction away from the area between the target two utility poles, it can be pulled toward the area between the adjacent pair of utility poles, making it possible to efficiently perform the work of extending the new communication cable. The above is the flow of the wire extension method.

[0027] As described above, the wire pulling trolley 1 according to the embodiment includes the housing 2, the lower wheel 4 rotatably supported by the housing 2 and supporting the newly installed communication cable so as to move the newly installed communication cable as the wheel rotates with the newly installed communication cable hung thereon, the ratchet mechanism 7 provided on the housing 2 and the lower wheel 4 and restricting the lower wheel 4 to rotate in only one direction, and the suspending means 5 provided on the housing 2 and suspending the housing 2 from the utility pole. Therefore, even if the tension on the newly installed communication cable is released, the newly installed communication cable already stretched between the utility poles will not move in a slack direction due to its own weight, and damage to the newly installed communication cable can be prevented.

[0028] The present invention is not limited to the above-described embodiment, and the following modifications are possible.

[0029] (Modification) In the above embodiment, the housing 2 includes the plate-like members 21, 22, the support members 23, 24, and the connecting means 25, but the present invention is not limited to this. If it is not necessary to configure the housing 2 to be separable, for example, the housing 2 may be configured as an integral unit with the plate-like members 21, 22 and the support members 23, 24 fixed to each other.

[0030] In the above embodiment, each of the plate-shaped members 21 and 22 is a single plate-shaped member, but the present invention is not limited to this. At least one of the plate-shaped members 21 and 22 may be configured to be separable at the middle so that the part of the housing 2 that supports the upper wheel 3 and the part that supports the lower wheel 4 can be separated from each other. This allows the wire pulley 1 to be removed from the existing communication cable after the new communication cable is installed on the utility pole using the wire pulley 1. At this time, it is preferable to separate at least one of the plate-shaped members 21 and 22 at the middle after removing the coil springs 6 from both ends of the rotating shafts 3a and 4a, and move the existing communication cable from the inside to the outside of the wire pulley 1 through the gap formed in the middle.

[0031] 6, the two plate-shaped members 21A and 21B constituting the plate-shaped member 21 may be configured to be openable and closable relative to each other, and the two plate-shaped members 22A and 22B constituting the plate-shaped member 22 may be rotatably connected by a hinge 22b. The two plate-shaped members 21A and 21B constituting the plate-shaped member 21 are provided with a locking member 21b so that they can be fixed in a closed state. The locking member 21b may be configured so that the two plate-shaped members 21A and 21B can be fixed to each other by hooking a pin provided on one of the plate-shaped members 21A and 21B with a hook rotatably supported on the other of the plate-shaped members 21A and 21B.

[0032] 7, the plate-shaped members 21, 22 may both be configured to be detachable at their middle portions, so that the housing 2 can be separated into upper and lower parts. The two plate-shaped members 21A, 21B constituting the plate-shaped member 21 and the two plate-shaped members 22A, 22B constituting the plate-shaped member 22 may each be detachably attached by one or more locking members 21b. When a new communication cable is to be erected on a utility pole using the wire pulley 1, the housing 2 may be combined, and when the wire pulley 1 is to be removed from the existing communication cable, the housing 2 may be separated into upper and lower parts.

[0033] In the above embodiment, the upper wheel 3 and the lower wheel 4 are fitted with rubber members as anti-slip members on the circumferential surface of the wheels, but the present invention is not limited to this. For example, the circumferential surface of the wheels may be provided with grooves or may be roughened.

[0034] In the above embodiment, the upper wheel 3 is configured to be able to move in a translational manner relative to the housing 2 and is biased toward the lower wheel 4, but the present invention is not limited to this. For example, the lower wheel 4 may be configured to be able to move in a translational manner relative to the housing 2 and is biased toward the upper wheel 3.

[0035] In the above embodiment, the newly installed communication cable is sandwiched between the upper wheel 3 and the lower wheel 4, but the present invention is not limited to this. Instead of the upper wheel 3, a sliding member that guides the newly installed communication cable toward the lower wheel 4 may be provided. Furthermore, if the newly installed communication cable comes into close contact with the lower wheel 4 due to its own weight or the like, the upper wheel 3 may be omitted.

[0036] In the above embodiment, the coil spring 6 is used as the biasing means, but the present invention is not limited to this. For example, a circular rubber band may be used as the biasing means.

[0037] In the above embodiment, the ratchet mechanism 7 is provided on the lower wheel 4 as the rotation restricting means, but the present invention is not limited to this. For example, the ratchet mechanism 7 may be provided on the upper wheel 3, or on both the upper wheel 3 and the lower wheel 4. Also, a one-way clutch may be used instead of the ratchet mechanism 7 as the rotation restricting means.

[0038] In the above embodiment, the pawl member 7b of the ratchet mechanism 7 is fixed to the inner surface of the plate-like member 22 of the housing 2, but the present invention is not limited to this. For example, the pawl member 7b may be supported movably relative to the plate-like member 22 and may be configured to be able to move to a position where it does not engage with the gear 7a.

[0039] In the above embodiment, the suspending means 5 is a round hook, but the present invention is not limited to this. As long as the wire pulley 1 can be suspended from the utility pole, the suspending means 5 may have any shape. For example, the suspending means 5 may be an openable and closable hook.

[0040] In the above embodiment, the wire-drawing car 1 and the wire-drawing car A are used in combination in the wire-drawing work, but the present invention is not limited to this. For example, the wire-drawing car 1 alone may be used in the wire-drawing work without using the wire-drawing car A.

[0041] In the above embodiment, the wire pulley 1 is attached to a utility pole, but the present invention is not limited to this. As long as it is possible to prevent the wire pulley 1 from moving relative to the object, it may be attached to any object. For example, the wire pulley 1 may be attached so as not to move relative to an existing communication cable or a temporary hanging wire, or it may be attached to a steel tower.

[0042] In the above embodiment, the object of the wire-extending work is a communication cable, but the present invention is not limited to this. For example, the object of the wire-extending work may be an electric wire.

[0043] The above-mentioned embodiments are merely examples, and the present invention is not limited to these, and various embodiments are possible without departing from the spirit of the invention described in the claims. The components described in the embodiments and modifications can be freely combined. In addition, inventions equivalent to the inventions described in the claims are also included in the present invention. [Explanation of symbols]

[0044] 1 Line extension gold car 2. Housing 3 Upper Wheel 4 Lower wheels 5. Hanging means 6 Coil spring 7 Ratchet mechanism 7a Gears 7b Claw member

Claims

1. Housing and a first wheel that is rotatably supported by the housing and supports the cable so as to move the cable as the first wheel rotates with the cable hung thereon; a second wheel that is rotatably supported by the housing and that supports the cable so as to move the cable as the second wheel rotates while sandwiching the cable together with the first wheel; a rotation restricting means provided on the housing and the first wheel for restricting the first wheel to rotate in only one direction; A hanging means is provided on the housing and hangs the housing on an attachment target, The housing includes a pair of plate-like members spaced apart from each other, and a pair of support members connected to upper and lower ends of each of the plate-like members, The second wheel is supported so as to be capable of translational movement toward the first wheel by having both ends of a rotation shaft of the second wheel guided by respective guide grooves formed in each plate-like member, and the second wheel is provided with a biasing means for biasing the first wheel and the second wheel so as to approach each other. Railway gold car.

2. Housing and a first wheel that is rotatably supported by the housing and supports the cable so as to move the cable as the first wheel rotates with the cable hung thereon; a second wheel that is rotatably supported by the housing and that supports the cable so as to move the cable as the second wheel rotates while sandwiching the cable together with the first wheel; a rotation restricting means provided on the housing and the first wheel for restricting the first wheel to rotate in only one direction; A hanging means is provided on the housing and hangs the housing on an attachment target, The housing includes a pair of plate-like members spaced apart from each other, and a pair of support members connected to upper and lower ends of each of the plate-like members, One of the plate-shaped members is configured such that a portion supporting the first wheel and a portion supporting the second wheel can be opened and closed at its intermediate portion, and the other plate-shaped member is configured such that a portion supporting the first wheel and a portion supporting the second wheel are rotatably connected at its intermediate portion. Railway gold car.

3. Housing and a first wheel that is rotatably supported by the housing and supports the cable so as to move the cable as the first wheel rotates with the cable hung thereon; a second wheel that is rotatably supported by the housing and that supports the cable so as to move the cable as the second wheel rotates while sandwiching the cable together with the first wheel; a rotation restricting means provided on the housing and the first wheel for restricting the first wheel to rotate in only one direction; A hanging means is provided on the housing and hangs the housing on an attachment target, The housing includes a pair of plate-like members spaced apart from each other, and a pair of support members connected to upper and lower ends of each of the plate-like members, Each plate-like member is configured at its intermediate portion to be detachably attached to a portion supporting the first wheel and a portion supporting the second wheel. Railway gold car.

4. The cross-sectional shape of the peripheral surface of the first wheel is formed in a concave shape, The cross-sectional shape of the peripheral surface of the second wheel is formed in a convex shape. The wire pulley according to any one of claims 1 to 3.

5. the rotation restricting means is a ratchet mechanism including a gear and a pawl member that deforms while contacting the gear, The gear rotates integrally with the first wheel around a central axis, and the pawl member is provided on the housing. The wire pulley according to any one of claims 1 to 3.

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