JP7366970B2 - Hanging hardware for cables - Google Patents

Description

The present invention relates to cable suspension hardware used when cables such as communication cables are laid overhead between utility poles.

For example, methods for installing communication cables such as optical fiber cables (hereinafter abbreviated as "optical cables") include an overhead cable installation method in which the cables are installed between utility poles, and a direct burial method at a low depth underground.

An overview of overhead cable construction will be explained based on FIG. Here, the optical cable 2 is stretched near the utility pole 1 and then supported by a cable hanging hardware 5 attached to the utility pole 1. This cable hanging hardware 5 is known, for example, in Patent Documents 1 and 2.

The cable hanging hardware 5 of Patent Document 1 is attached to a length-adjustable utility pole band, and grips the optical cable 2 by the gripping hardware body. This gripping hardware main body is configured to be movable according to the tension of the left and right optical cables 2 by spring means.

The cable suspension hardware 5 of Patent Document 2 includes a support arm that is attached substantially horizontally to the utility pole 1, and a pair of arms that are provided on the same plane and at a substantially right angle to the support arm to support the optical cable 2 in an upright manner. It is equipped with a side arm.

JP2006-197666 JP2007-60769

In conventional overhead cable construction, a worker 3 holds an optical cable 2 for each utility pole 1 and climbs onto the work floor 4 of an aerial work vehicle such as a lift vehicle, and suspends the optical cable 2 by working at a height of 5 to 6 meters above the ground. It had to be attached to the frame 5.

In particular, it is necessary to arrange an aerial work vehicle and a worker 3 for each utility pole 1 in the installation section, which may result in poor workability and difficulty in reducing costs. Furthermore, since the work was carried out at high places, there was a risk that the safety of the worker 3 would be compromised.

The present invention was made to solve these conventional problems, and provides a cable support fitting for simple overhead construction that is accessible from the ground, improving workability and safety of cable installation, and reducing costs. The problem to be solved is to achieve this goal.

(1) The present invention is a cable suspension hardware used when installing cables between utility poles overhead,
a metal fitting body supported by a utility pole band attached to the utility pole;
a fixing part fixed to the metal fitting main body;
a movable part movably mounted in a space formed along the direction between the utility poles of the fixed part,
The cable inserted between the fixed part and the movable part moves the movable part in one direction,
It is characterized in that it is fixed between the fixed part and the movable part.

(2) In one aspect of the present invention,
The fixing part includes a pair of pressing members,
One of the pressing members has a recess formed along the direction between the utility poles,
The space portion is formed by fixing the recessed portion facing the other pressing member,
One of the pressing member and the movable member has opposing surfaces formed as inclined surfaces having the same slope angle,
The cable inserted between the other pressing member and the movable member is fixed by narrowing the space when the movable part moves in one direction.

(3) In another aspect of the present invention,
inserting the cable between the other pressing member and the movable member to apply tension in the other direction;
When the tension is released, the movable member moves in one direction due to the weight of the cable;
It is characterized in that the cable is held and fixed between opposing surfaces of the other pressing member and the movable member.

(4) In yet another aspect of the present invention,
The slope angle of each of the inclined surfaces is determined in consideration of the gripping force between the two members and the influence on the outer sheath of the cable.

(5) In yet another aspect of the present invention,
It is characterized in that stopper portions for preventing slippage are formed at both ends of the movable portion.

(6) In yet another aspect of the present invention,
The stopper part is erected on both ends of the movable part,
One of the holding members is provided with an engaging fitting that engages with the stopper portion to prevent the movable portion from returning after the cable is fixed.

(7) In yet another aspect of the present invention,
A convex portion is formed on at least one of the two inclined surfaces.

(8) In yet another aspect of the present invention,
A plurality of the convex portions are formed approximately at the longitudinal center of the inclined surface.

(9) In yet another aspect of the present invention,
The movable part is characterized in that it is constituted by a wedge member.

According to the present invention, by providing a cable support fitting for simple overhead construction that can be accessed from the ground, it is possible to improve the workability and safety of cable installation and to reduce costs.

Construction diagram of overhead cable installation using conventional cable support fittings. FIG. 1 is a schematic diagram of simple installation of an overhead cable using a cable suspension hardware according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which the cable hanging hardware of Example 1 is attached to a telephone pole. An exploded perspective view of the suspension hardware for the same cable. (a) is a front view of the metal fitting main body, (b) is a plan view thereof, and (c) is a side view. (a) is a plan view of the lower holding member, (b) is a front view of the same, and (c) is a left side view of the same. (a) is a plan view of the upper holding member, (b) is a front view thereof, (c) is a left side view thereof, and (d) is a right side view thereof. (a) is a front view of the stopper metal fitting, (b) is the same top view, and (c) is the same left side view. (a) is a front view of a movable member, (b) is the same top view, (c) is the same side view, and (d) is an enlarged view of the Q part of (a). FIG. 3 is a vertical cross-sectional view of the first embodiment when the cable is inserted. Vertical cross-sectional view of the same cable when it is fixed. (a) is a state diagram when the cable of Example 2 is inserted, and (b) is a state diagram when the same cable is fixed.

Hereinafter, a cable support fitting according to an embodiment of the present invention will be described. This cable support fitting is mainly used when installing communication cables such as optical cables overhead. According to this cable support fitting, a cable installation method that is simple and can be installed from a low place is realized, and costs are reduced by improving workability and safety is ensured by avoiding work at high places.

Embodiment 1 of the cable support fitting will be described based on FIGS. 2 to 11. Here, the same configuration as in FIG. 1 will be explained using the same reference numerals.

<<Configuration example>>
Reference numeral 10 in FIG. 3 indicates the cable suspension hardware supported by the utility pole band 11 fastened to the utility pole 1. The supporting hardware 10 is attached to the utility pole band 11 at the attachment position P of the utility pole 1 shown in FIG. 2, respectively. The height L1 of this mounting position P is approximately 3.5 m above the ground.

Specifically, the cable suspension hardware 10 is surface-treated with hot-dip galvanizing, and as shown in FIGS. a pair of upper and lower holding members 13 and 14, a movable member 15 mounted between both holding members 13 and 14 so as to be movable along the direction between the utility poles 1 (arrow XY direction), and a movable member 15 that is regulated. A stopper fitting 16 is provided.

(1) Metal fitting body 12
As shown in FIGS. 5(a) to 5(c), the metal fitting main body 12 is formed into an L-shape in longitudinal section, and has a vertical portion 12a parallel to the utility pole 1, and a vertical portion 12a bent at a substantially right angle from the lower end of the vertical portion 12a. horizontal portion 12b. Here, the vertical portion 12a is attached between the utility pole 1 and the utility pole band 11, and has a locking piece 12c that engages with the attachment hole 11a of the utility pole band 11. On the other hand, a pair of female screw holes 12d are formed in the horizontal portion 12b, and both presser members 13 and 14 are fixed onto the horizontal portion 12b.

(2) Pressing member 13
As shown in FIGS. 6(a) to 6(c), the holding member 13 includes a main body 13a formed in an L-shape in longitudinal section and a horizontally placed quadrangular column shape, and a main body 13a extending horizontally from the bottom of the main body 13a. The horizontal part 13b has a horizontal part 13b, and a presser part 13c is bent upward at the tip of the horizontal part 13b. This main body 13a is formed with a communication hole 13d that communicates with the female screw hole 12d of the horizontal portion 12b.

(3) Pressing member 14
As shown in FIGS. 7(a) to 7(d), recesses 14a and 14b are formed through the upper and lower surfaces of the holding member 14 along the longitudinal direction (arrow XY direction), respectively. Side surfaces 14c and 14d of both the recesses 14a and 14b are formed into symmetrical inclined surfaces (hereinafter referred to as inclined surfaces 14c and 14d).

Specifically, as shown in FIGS. 7(c) and 7(d), the inclined surface 14c is formed with an upward slope toward the X direction, while the inclined surface 14d is formed with a downward slope toward the X direction. The space between both 14c and 14d is formed to widen toward the end in the X direction.

Furthermore, as shown in FIGS. 7(a) to (c), a communication hole 14f communicating with the female screw hole 12d and the communication hole 13d is formed in one open end 14e of the recesses 14a and 14b. Furthermore, a female screw hole 14h for mounting a stopper fitting 16 is formed in the other open end 14g of the recesses 14a and 14b.

(4) Stopper fitting 16
As shown in FIGS. 8(a) to 8(c), the stopper metal fitting 16 is formed in an L shape, and includes a support portion 16a in which a through hole 16c is formed, and a locking portion bent at a substantially right angle from the support portion 16a. 16b (see FIG. 8(b)). The stopper fitting 16 is rotatably supported by a bolt shaft (not shown) fastened to the female threaded hole 14h via the through hole 16c.

(5) Movable member 15
The movable member 15 has a concave longitudinal section, and as shown in FIGS. 9(a) to 9(c), it includes a wedge-shaped movable body 15a and stopper portions erected at both ends of the movable body 15a. 15b and 15c.

Specifically, the upper surface 15e (between the stopper parts 15b and 15c) of the movable main body 15a is formed into an inclined surface with a downward slope toward the X direction (hereinafter referred to as an inclined surface), as shown in FIG. 9(a). 15e). This inclined surface 15e is formed to have the same slope angle as the inclined surface 14d of the holding member 14.

Furthermore, as shown in FIG. 9(d), four convex portions 15g are formed on the lower surface 15f of the movable main body 15a at approximately the center in the longitudinal direction (arrow XY direction). This convex portion 15g is formed along the width direction of the lower surface 15f.

Then, the presser member 14 is placed with the opening of the recess 14b facing the horizontal portion 13b of the presser member 13, and the movable member 15 is placed in the space R (see FIG. 10) between both 13b and 14b. do. Thereafter, a bolt shaft portion (not shown) is fastened to the female threaded hole 12d through the communication holes 13d and 14f. As a result, both the presser members 13 and 14 are fixed to the metal fitting main body 12, and the movable member 15 is movably mounted between the presser members 13 and 14.

≪Cable installation method≫
An optical cable installation method using the cable hanging hardware 10 will be described based on FIGS. 2, 10, and 11. Here, the installation work of the optical cable 2 is performed in order for each utility pole 1.

To explain the utility pole 1n in FIG. 2 as an example, the worker 3 first fastens the utility pole band 11 to the installation position P of the utility pole " _1n " on a step stool or trolley, and attaches the cable to the utility pole band 11. Attach the hanging hardware 10. This installation work is performed by installing the vertical portion 12a between the utility pole 1 and the utility pole band 11, and engaging the locking piece 12c in the attachment hole 11a. After this attachment, as shown in FIG. 10, the optical cable 2 is inserted between the movable member 15 and the horizontal portion 13b.

Next, as shown in FIG. 2, the worker 3 descends from a step stool or the like to the ground and pulls the optical cable 2, thereby applying a tensile force to the optical cable 2 in the direction of arrow Y. At this time, the optical cable 2 is prevented from falling off by the holding portion 13c.

Thereafter, when the optical cable 2 is released to release the tension, the optical cable 2 returns in the direction of the arrow X due to its own weight, and the movable member 15 moves in the same direction together with the optical cable 2, as shown in FIG.

Therefore, the inclined surface 14d of the movable member 15 moves in the direction of the arrow X along the inclined surface 14d of the holding member 14, and the space R narrows as the movable member 15 moves in the same direction.

When the stopper portion 15c hits the holding member 14, the optical cable 2 is held between the lower surface 15f of the movable member 15 and the upper surface 13e of the horizontal portion 13b, and is fixed between both surfaces 15f and 13e.

In particular, the convex portion 15g of the movable member 15 prevents the optical cable 2 from slipping, and the optical cable 2 can be reliably fixed between the two surfaces 15f and 13e. As a result, simple overhead construction of the optical cable 2 is realized, a cable support fitting that can be attached from a low place can be provided, and the following effects can be obtained.

(1) The cable installation work is easy and requires only one worker, as it is only necessary to insert the optical cables 2 into the space R in the order of utility poles "1 _n-1 , 1 _n... " and then pull and release them. Can be done alone. This reduces labor costs and reduces construction costs.

(2) Since the cable installation work does not require work at height, there is no need to use a lift vehicle or other aerial work vehicle, which can also reduce costs and ensure the safety of worker 3. .

(3) If the slope angle of the inclined surfaces 14c, 14d, and 15e is increased, the cable gripping force of the two surfaces 15f, 13e will be improved and the cable can be firmly fixed, but there is a risk of damaging the outer sheath of the optical cable 2. .

Therefore, the slope angles of the inclined surfaces 14c, 14d, and 15e are determined by taking into consideration the gripping force of the two surfaces 15f and 13e, the influence on the outer sheath of the optical cable 2, etc., and in this respect, damage to the outer sheath is minimized. The optical cable 2 can be fixed by holding it down. Specifically, the slope angle is set in the range of "3 degrees to 5 degrees", with "4 degrees" being a particularly preferable value.

(4) The movement range of the movable member 15 in the XY direction is regulated by the stopper portions 15b and 15c hitting both ends (ends in the XY direction) of the holding member 14. This restricts excessive movement of the movable member 15 in the direction of the arrow X, and in this respect as well, the influence on the outer sheath of the optical cable 2 is suppressed. Further, the stopper portions 15b and 15c prevent the movable member 15 from coming off between the presser members 13 and 14.

(5) By engaging the stopper fitting 16 with the stopper portion 15c, it is possible to prevent the movable member 15 from returning in the direction of arrow Y, and in this respect, the optical cable 2 is prevented from coming off.

A second embodiment of the cable support fitting will be described based on FIG. 12. Reference numeral 20 in FIGS. 12(a) and 12(b) indicates the cable support fitting of the second embodiment. Here, the movable member 15 is constituted by a wedge member having a toothed portion formed on the lower surface 15f, and the lower surface 14d of the holding member 14 is formed not as an inclined surface but as a horizontal surface.

According to the cable hanging hardware 20, when the tension in the direction of the arrow Y in FIG. 12(a) is released, the weight of the optical cable 2 is applied to the direction along with the optical cable 2. As a result, the optical cable 2 is sandwiched and fixed between the movable member 15 and the horizontal portion 13b, and the same effect as in the first embodiment can be obtained.

Note that the present invention is not limited to the above embodiments, and can be implemented with modifications within the scope of each claim. For example, in Embodiment 1, an example was explained in which the optical cable 2 is laid in the order from the telephone pole "1 _n-1 " to the telephone pole "1 _n " in FIG. The left and right sides of the member 15 may be reversed by 180 degrees to make the slopes 14d and 15e slope downward in the Y direction.

Furthermore, the optical cable 2 can be laid by attaching the movable member 15 with the stacking order of the holding members 13 and 14 reversed. That is, if the holding member 14 is placed on the horizontal portion 12b, and the holding member 13 is placed thereon with the concave portion 14a facing upward and bolted, a space R is formed and the movable member 15 is Installation is now possible. In this case as well, the slopes 14d and 15e have a downward slope in the Y direction.

Furthermore, if the optical cable 2 is thick, the holding member 13 may be changed to a type having a large main body portion 13a.

1... Telephone pole 2... Optical cable (cable)
10, 20... Cable suspension hardware 11... Utility pole band 12... Metal fitting body 13, 14... Pressing member (fixing part)
14c, 14d, 15e, 15f... Inclined surface 15... Movable part 15b, 15c... Stopper part 15g... Convex part 16... Stopper metal fitting (engaging metal fitting)

Claims (7)

A cable suspension hardware used when installing cables between utility poles overhead,
a metal fitting body supported by a utility pole band attached to the utility pole;
a fixing part fixed to the metal fitting main body;
a movable part movably mounted in a space formed along the direction between the utility poles of the fixed part,
The cable inserted between the fixed part and the movable part moves the movable part in one direction,
fixed between the fixed part and the movable part,
The fixing part includes a pair of pressing members,
One of the pressing members has a recess formed along the direction between the utility poles,
The space portion is formed by fixing the recessed portion facing the other pressing member,
One of the pressing member and the movable part has opposing surfaces formed as inclined surfaces having the same slope angle,
The cable inserted between the other pressing member and the movable part is fixed as the space narrows when the movable part moves in one direction.
A hanging hardware for cables characterized by the following. inserting the cable between the other pressing member and the movable part to apply tension in the other direction;
When the tension is released, the movable part moves in one direction due to the weight of the cable,
The cable suspension hardware according to claim 1 , wherein the cable is held and fixed between opposing surfaces of the other pressing member and the movable part . The slope angle of each of the inclined surfaces is determined in consideration of the gripping force between the other pressing member and the movable part and the influence on the outer sheath of the cable . Cable support fittings listed. The cable suspension hardware according to any one of claims 1 to 3, wherein stopper parts for preventing the cable from coming off are formed at both ends of the movable part. The stopper part is erected on both ends of the movable part,
5. The cable suspension rack according to claim 4 , wherein one of the holding members is provided with an engaging fitting that engages with the stopper portion to prevent the movable portion from returning after the cable is fixed. hardware. The cable suspension hardware according to any one of claims 2 to 5 , wherein a convex portion is formed on the inclined surface of the movable portion . 7. The cable support fitting according to claim 6 , wherein a plurality of the convex portions are formed approximately at the longitudinal center of the inclined surface.

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