Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – Conduit snakes
Reexamination Certificate
1999-07-02
2001-05-08
Watson, Robert C. (Department: 3723)
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
Conduit snakes
C254S13430R
Reexamination Certificate
active
06227522
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and implement for installation of spiral hangers for hanging a cable on a messenger wire.
2. Description of Related Art
Conventionally, a hanger system
100
as shown in
FIGS. 15 and 16
has been commonly used to hang a cable from a messenger wire and fix the cable thereto. The procedure for installing a cable using such a hanger system will be described with reference to FIG.
15
. First, a plurality of pulleys
121
are attached to a messenger wire
102
which has been installed between electric utility poles
101
a
and
101
b
. A pull rope
122
is then passed through the pulleys
121
and is connected to a winch
103
. The winch
103
is then operated so as to cause a cable
114
connected to the pull rope
122
to run between the electric utility poles
101
a
and
101
b
. Subsequently, hangers
106
shown in
FIG. 14
are attached to the messenger wire
102
at intervals of 50-60 cm and the pulleys
121
are removed. These operations are performed by a worker
104
who dangles in midair between the electric utility poles
101
a
and
101
b
. This is called midair dangling work. Therefore, the worker
104
must have experience, and this work is time consuming and dangerous. Also, an accident has occurred in which a pulley
121
fell down and injured a passer-by. Accordingly, a strong desire exists to solve the above-described problems.
Also, when a cable is supported by use of hangers, there is the possibility that the hangers may fall down or slide sideways due to external causes, with the result that proper support of the cable cannot be maintained and the characteristics of the cable are adversely affected.
SUMMARY OF THE INVENTION
In view of the foregoing problems, an object of the present invention is to provide a method for installation of spiral hangers for hanging a cable which can be performed safely without the need for midair dangling work and which can prevent the hanger from falling down or sliding sideways.
Another object of the present invention is to provide implements for facilitating the installation of spiral hangers as well as for leading a cable into the spiral hangers.
In order to achieve the above object, the present invention provides a method of installing spiral hangers for hanging a cable on a messenger wire installed between a pair of electric utility poles. The method comprises the steps of:
(a) movably attaching one end of a spiral hanger to a messenger wire in the vicinity of one of the electric utility poles, the spiral hanger having an inner diameter greater than the sum of the outer diameter of the messenger wire and the outer diameter of the cable;
(b) transporting the spiral hanger toward the other of the electric utility poles;
(c) joining the other end of the spiral hanger to one end of a succeeding spiral hanger through use of a joint sleeve;
(d) repeating steps (b) and (c);
(e) fixing the spiral hangers to the messenger wire through use of fixing devices when the first spiral hanger arrives at the other of the electric utility poles; and
(f) passing a cable through the spiral hangers through use of a pull-rope threading implement.
With this operation, the cable can be installed by work performed only in the vicinity of the electric utility poles.
The present invention also provides an implement set used for installation of spiral hangers for hanging a cable on a messenger wire installed between a pair of electric utility poles.
The implement set comprises:
an introduction/guide implement having a ring portion through which the spiral hangers freely pass and a support portion through which the introduction/guide implement is supported by the messenger wire;
a falling-down-prevention coupling implement to be attached to the forward end of the first spiral hanger and adapted to be coupled with the messenger wire;
a cylindrical introduction guide to be fit onto the messenger wire with a clearance being formed between the messenger wire and the bottom portion of the cylindrical introduction guide; and
a pull-rope threading implement for passing the cable through the spiral hangers attached to the messenger wire installed between the electric utility poles.
The present invention also provides an implement used for installation of spiral hangers for hanging a cable. The implement is composed of a feed apparatus which comprises a pair of pinch rollers for sandwiching and feeding a spiral hanger, and a handle for rotating the pinch rollers.
When the method and the implement set according to the present invention are utilized, dangerous midair dangling work becomes unnecessary, and all work can be performed in the vicinity of electric utility poles. Accordingly, the attachment of the spiral hangers serving as cable holders to the messenger wire can be performed safely and easily.
Also, the method according to the present invention can eliminate the work of attaching and detaching jigs such as a pulley to a messenger wire. Therefore, there can be eliminated the possibility of parts falling down and hitting a passer-by.
In the method of the present invention, each of the spiral hangers is fixed to an adjacent joint sleeve by crimping and the spiral hangers are fixed to the messenger wire through use of fixing devices. Accordingly, the spiral hangers are prevented from sliding or falling.
Moreover, when the introduction/guidance implement is used, the installation of the spiral hangers can be performed easily, quickly, and reliably.
When the pull-rope threading implement according to the present invention is utilized, the cable can be led into the inside space of the spiral hanger smoothly and quickly.
When the feed apparatus of the present invention is used, it becomes possible to smoothly feed spiral hangers having a length of 3000 mm and spiral hangers having a length of 5000 mm, as well as spiral hangers having a length of 1000 mm. In addition, the connection and crimping work at joint sleeves can be facilitated.
REFERENCES:
patent: 2744707 (1956-05-01), Peterson
patent: 3185443 (1965-05-01), Eitel
patent: 3185444 (1965-05-01), Eitel
patent: 3814383 (1974-06-01), Jackson
patent: 4019715 (1977-04-01), Vugrek
patent: 4191334 (1980-03-01), Bulanda et al.
patent: 5040771 (1991-08-01), Spell
patent: 5727777 (1998-03-01), Chikiri et al.
Chikiri Kazuyoshi
Higashi Yukikiro
Armstrong, Westerman Hattori, McLeland & Naughton
Hien Electric Industries, Ltd.
Watson Robert C.
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