JPH08242522A - Mobile cable stringing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a movable cable suspender having resistance in outdoor or field use by coupling the coupling piece of a fixed suspension element with a cable gripper through a flexible coupling member made of a flat suspension band having specified rupture strength. SOLUTION: The movable cable suspender 1 utilizing a fixed suspension element 3, e.g. an externally accessible hook, is arranged for the coupling piece 4 of the fixed suspension element 3 to be coupled therewith. A fastener comprising two screws 61 and nuts cooperates with a cable gripper 5 comprising two grips 51, 52 and the coupling piece 4 is coupled with the cable gripper 5 through a flexible coupling member 7. The flexible coupling member 7 employs a flat suspension band having rupture strength of 1000 daN. With such structure, the cable suspender can withstand a severe vibration test and outdoor or field use resistance can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable movable suspension system.

In the present invention, the term "cable" refers to
In general, it comprises a core, for example made of metal, for transporting high or low voltage power or for transmitting electrical or optical signals, in particular signals carrying information,
Refers to any thread-like structure with at least one layer of protective armor.

Such a cable may be self-supporting or supported by another cable. In this latter case, the supporting cable is called a strut,
It does not carry power or carry signals, but the supported cables carry power or carry signals or information. In this case, the ropes and the cables supported are integrated into one and the same structure consisting of two parts, a small section for the cables and a large section for the cables supported. can do. In the description below, for example, a telephone line in which a supported cable and a supporting line are integrated is taken as an example.

Generally, a fixed suspension element accessible from the outside, for example, a movable suspension system of a cable attached to a hook is composed of the following elements. -A connecting piece of a fixed hanging element, for example hooked and arranged so as to be combined with the above-mentioned fixed hanging element, -a gripping of a cable consisting of two grips cooperating with a fastener Tool-a flexible connecting member, for example a chain, which connects the connecting piece and the gripping tool.

Since overhead telephone lines are actually subjected to static and dynamic loads, and in particular to relatively large vibrations, under these circumstances the mobile suspension of the telephone lines is Maintaining the integrity and integrity of the suspension itself is required. As a method of simulating such a constraint condition, generally, as will be described later with reference to FIG. 5, a test bench is used to vibration test a new type cable movable device, There is a method of qualitatively and quantitatively measuring a test result of a movable suspension device and a cable suspended and suspended on the same device while applying vibration for a predetermined time.

[0006]

The inventors have tested movable suspensions of various telephone lines by using the above-mentioned vibration test bench. However, until the present invention, the telephone line was suspended. And could not find a solution to maintain the integrity of the suspension. In fact, regardless of the device tested,
The obtained results were the following unfavorable results.

1) Vibrations repeatedly apply a shearing stress to a cable, which usually causes cracks in the outer casing of a plastic cable or compaction of metal parts. After a certain amount of time, at least partial damage is observed in the strut or supported cable. Such a breakage is unacceptable, especially for coaxial supports. 2) The parts or elements of the suspension rub against each other, for example when galvanized, the protective layer may peel off, or premature wear of the suspension may occur and even break.

[0008]

Unexpectedly, the inventors have been able to withstand the above-mentioned most severe vibration tests and to realize a cable movable suspension with resistance outdoors or outdoors. I found a simple solution. According to the invention, it is sufficient to use a strip-shaped flat suspension band with a breaking strength of at least 1,000 daN as the flexible connecting member between the coupling piece of the movable suspension and the gripping tool.

Surprisingly, the strip-shaped flat sling band imparts all the desired freedom of movement to the suspension, as demonstrated by tests using the test bench described below, in effect from small amplitudes to large amplitudes. It can withstand all low and high frequency vibrations up to its amplitude.

This solution also offers the following decisive advantages: The use of a strip-shaped flat suspension band makes it easy to select a coupling piece or a gripper suitable not only for the length of the band but also for the fixed hanging element used together, the type of cable to be supported, etc. It suffices to attach the flat sling band to the connecting piece and the gripping tool used together in a very simple manner, for example by stitching. This eliminates the need to diversify the type of suspension, among other things, depending on the type of cable it supports, the type of fixed suspension element used with it, etc.

The flat sling band made of a woven fabric obtained from a non-perishable material or wire which has a relatively high resistance to atmospheric or chemical action is made of a synthetic material, especially polyester, and has a resistance to light, especially to ultraviolet light. It is possible to realize a non-corrosive movable suspension system including

[0012]

DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described with reference to the accompanying drawings. FIG. 1 shows, in a perspective view, a mobile suspension device, which is connected to a fixed suspension element for gripping and supporting a cable composed of a cable and a cable supported. FIG. 2 is a vertical sectional view showing a usage state of the suspension device shown in FIG. 3 and 4 are exploded perspective views of two suspension devices according to the present invention, but with selected coupling pieces different from those shown in FIGS. 1 and 2. FIG. 5 is a schematic diagram of a vibration test bench capable of testing a mobile suspension according to the present invention.

A suspension system 1 according to the invention, based on FIGS. 1 and 2, supports a telephone line 2 in which a small-section stanchion 21 and a large-section supported cable 22 are integrally connected,
Can be suspended. This device cooperates with a fixed hanging element 3, eg a pigtail type hook, which is accessible from the outside and is associated with a support (not shown), eg a utility pole.

The general construction of the suspension system according to the invention is:
It is as follows. A coupling piece 4 arranged to be coupled with a fixed hanging element 3, i.e. a hook, for example when mounting a telephone line on a telephone pole. The connecting piece 4 is a flat-shaped element 10, which is made of plastic, metal or metal alloy, and has a hook hole 4b at the upper end opposite to the flat suspension band 7 and a lower end of the connecting piece 4. The part is provided with a lateral slit 4a, to which the coupling loop 7a of the band 7 defined above is attached.

-Two grips 51, 52 are provided, each grip having a lateral slit 51a, 52a.
Is provided with the slits 51a and 52a, and the flat connecting loop 7b of the suspension band 7 defined below is attached to the cable 2, and more specifically, the gripping tool 5 of the strut 21. Two slits 51a, 52a are arranged facing each other, and a flat coupling loop 7b passes through this slit. Two grips 51,5
2 constitute two elongated spaces 81, 82 (see FIG. 2) arranged one above the other for tightening the supported cables 21 selected on the basis of their cross-section when brought close to each other, one of which The space 81 has a relatively small cross section, and the other space 82 has a relatively large cross section.

A flexible connecting member 7 connecting the connecting piece 4 and the gripper 5 and consisting of a strip-shaped flat suspension band with a breaking strength of at least 1,000 daN. This hanging band
From woven fabrics made of non-perishable material or wire similar to belts used as automobile safety belts, and of relatively high resistance to atmospheric or chemical effects, for example synthetic materials such as polyester It is configured.

As shown in FIG. 2, the flat band consists of two strands 7c, 7d folded in opposition to each other and joined by a transverse seam 7e to form two flat strips. Loop 7a, 7b
To form the slit 4a and the gripper 5 of the coupling piece 4, respectively.
Are attached to two slits 51a and 52a facing each other.

The gripper 5 has two slits 51a and 52a.
It is provided with a fastener 6 composed of two screws 61 and nuts 62 arranged on both sides of a and passing through holes (not shown) of the two grips 51 and 52. The two screws 61 cooperate with the spring 12 to maintain the two grips 51 and 52 in the open state. Furthermore, the cross section of the head of each screw 61 has a square cross section, which can cooperate with the two holes of the grip 52 of the corresponding cross section to block the screw 61 from rotating with respect to the nut 62.

The implementations illustrated in FIGS. 1 and 2 provide quite unexpected advantages and are particularly useful for telephone line installation personnel. In fact, the connecting piece 4 is the hook 3
It is possible to pass the cables from one space 81 to the other space 82 according to the following procedure even after being coupled to and attached to.

180 gripper 5 inside loop 7b
Rotate by °. Then, the band 7 is twisted. Lift the gripper 5 with one hand and release the twisted band 7 with the other hand. -Untwist the hand 7 at the top of the gripper 5 to bring the band flat and normal. This way, depending on the cable attached to the pole,
The operator can easily pass the cable from one position of the gripping tool 5 to the other position.

According to FIG. 3, the flat element 10 of the connecting piece 4 is shown.
Is a buckle 9 having a triangular shape, and a nut 17 is screwed into a screw 17 passing through the buckle 9 to be supported by a strap 19. According to FIG. 4, the flat suspension element 10 comprises a flat part 11 made of plastic or aluminum alloy, to which a threaded longitudinal link 72 is connected as an insert, and a nut. In cooperation with 25, it is adapted to be fixed or suspended by using a mounting hardware 20 belonging to or constituting the fixed hanging element 3.

The test bench shown in FIG. 5 can be used to vibration test overhead telephone lines. The configuration of the bench shown in FIG. 5 is as follows. Utility pole 92 to which the suspension device 1 according to the invention is attached
Three utility poles 91, 92, 83 forming two spans of 40 meters separated by a central bearing-an end utility pole 84 to which various devices for adjusting and measuring the voltage of the cable 2 can be mounted, A cable exciter 85 consisting of a DC motor 86 and a connecting rod-crank system 87
Is.

The speed of the DC motor 86 can be electronically adjusted to maintain the vibration mode 3 for as long as possible within the maximum and minimum speeds specified by the operator. 10 deceleration cycles and 10 acceleration cycles
Minutes. The system 87 provides a longitudinal reciprocating movement of 120 mm in amplitude for the cables gripped by the set of grips, but the grips are not stressed.

The test procedure is carried out in the following two stages. The first step for eliminating the phenomenon of mechanical tension drop due to the release of stress. At this stage, the cable tensioned above the recommended rest tension is vibrated. A second stage consisting of so-called vibration tests. The cable is tensioned with rest tension.

The speed of the motor 86 is the vibration mode closest to the worst condition confirmed in the field at the time of the test, that is,
It is adjusted so that mode 3 can be maintained. The second stage time is determined by the nature of the cable being tested.

A telephone line consisting of a cable with a sheath of 5 mm in diameter and a supported cable formed by a combination of 14 pairs of copper wire with a unit diameter of 0.4 mm,
Using a suspension system adapted to FIGS. 1 and 2, the above second
The steps were carried out for 300 hours, but the suspension was worn or broken,
No deformation of the telephone line structure, cracking or deterioration of the cables supporting the ropes was confirmed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a mobile suspension system coupled with a fixed suspension element for gripping and supporting a cable composed of a cable and a supported cable.

FIG. 2 is a vertical cross-sectional view showing a usage state of the suspension device shown in FIG.

FIG. 3 is an exploded perspective view showing a suspension device in which a coupling piece different from the suspension device shown in FIGS. 1 and 2 is selected and used.

FIG. 4 is an exploded perspective view showing a suspension device in which another coupling piece is selected and used, as in FIG. 3.

FIG. 5 is a schematic diagram showing a vibration test bench capable of testing a mobile suspension according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable suspension device 2 Cable 3 Fixed hanging element 4 Coupling piece 4a Slit 4b Hook hole 5 Grasping tool 6 Tightening tool 7 Flexible coupling member 7a, 7b Coupling loop 7c, 7d Strand 7e Seam 10, 11 Flat element 12 With screw Link 51, 52 Grip 51a, 52a Slit 81, 82 Space

Claims (9)

[Claims] 1. A movable suspension system (1) for a cable (2) such as a telephone line, which utilizes a fixed suspension element (3) such as a hook accessible from the outside, the suspension system (1) being coupled to the fixed suspension element. And a cable gripper (5) consisting of two grips (51, 52) cooperating with a fastener (6), and a connecting piece (4) of fixed suspension elements arranged in such a way that 4) and a flexible connecting member (7) for connecting the gripping tool (5), wherein the flexible connecting member (7) is at least 1,000 da.
A movable suspension system for a cable, which comprises a flat belt-shaped suspension band having a breaking strength of N. 2. Movable cable according to claim 1, characterized in that the connecting piece (4) is provided with a slit (4a) through which the flat connecting loop (7a) of the suspension band (7) passes. Suspension system. 3. A slit (51a, 51a, 52a) through which a flat connecting loop (7b) of a suspension band (7) is passed through a gripper (5), in particular at least one grip (51, 52).
52. Movable cable suspension according to claim 1, characterized in that 52a) is open. 4. The two grips (51, 51) of the gripper (5)
52) and two slits (51) facing each other.
Movable suspension of cable according to claim 3, characterized in that a, 52a) is open and the flat connecting loop (7b) of the suspension band (7) passes through these two slits at the same time. . 5. The flat suspension band (7) is composed of a non-perishable material having a relatively high resistance to the atmosphere and chemical action, such as a synthetic material such as polyester. Movable suspension of the described cable. 6. A cable suspension system according to claim 1, characterized in that the suspension band (7) is made of woven cloth. 7. A flat suspension band is made up of two strands (7c, 7d) folded in such a manner that they face each other and are joined together by a transverse seam (7e) such as a seam to form two flat loops ( Movable suspension system for cables according to any of claims 1 to 3, characterized in that they are shaped into 7a, 7b) and are respectively attached to the connecting piece (4) and the gripping tool (5). 8. Two grips for fastening the cables arranged one above the other when the two grips (51, 52) are brought close to each other.
Cable according to claim 4, characterized in that it comprises two elongated spaces (81, 82), one space (81) having a relatively small cross section and the other space (82) having a relatively large cross section. Mobile suspension system. 9. Coupling piece (4) is a fixed hanging element (3).
A flat element (10) having a hook hole (4b) at the opposite end of the ring (9) having a triangular contour or the like, or the flat suspension band (7), depending on the type of
A movable cable according to claim 1, characterized in that it is selected from any of the flattened elements (11) provided with a threaded link (12) at the opposite end of the flat suspension band. Suspension system.