Electricity: conductors and insulators – Insulators – Insulator and conductor embracing holder
Reexamination Certificate
2000-11-13
2003-09-16
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Insulators
Insulator and conductor embracing holder
C174S0400CC, C174S157000
Reexamination Certificate
active
06621009
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to an electrical conductor support insulator for supporting an electrical conductor.
FIG. 11
is a side view illustrating a manner in which a main circuit conductor within a switchgear is supported by a conventional conductor support insulator hereinafter referred to as the first conventional insulator). In
FIG. 11
, the reference numeral
11
is an electrically insulating support insulator, and a bushing
12
with a female thread therein is provide at the upper and the lower end portions of the conductor support insulator
11
. The lower end portion of the conductor support insulator
11
is secured to a support frame
14
by a bolt
13
thread-engaged into the bushing
12
. Also, a main circuit conductor
15
disposed within a switchgear is mounted to the conductor support insulator
11
by a bolt
16
thread-engaged with the bushing
12
.
In supporting the main circuit conductor
15
disposed within the switchgear, the conductor support insulator
11
is secured to the support frame
14
by the bolt
13
, forming in the main circuit conductor
15
a mounting hole through which the bolt
16
is passed, and the main circuit conductor
15
is secured by the bolt
16
directly to the conductor support insulator
11
.
FIG. 12
is a side view illustrating another manner in which a main circuit conductor within a switchgear is supported by a conventional conductor support insulator (hereinafter referred to as the second conventional insulator). In
FIG. 12
, the reference numeral
21
is an electrically insulating support insulator, and a bushing
22
with a female thread therein is provide at the upper and the lower end portions of the conductor support insulator
21
. The lower end portion of the conductor support insulator
21
is secured to a support frame
23
by through the bushing
22
. At the upper end portion of the conductor support insulator
21
, an L-shaped support metal fitting
24
is secured by the bolt
25
thread-engaged into the bushing
22
. Also, a main circuit conductor
26
disposed within a switchgear is mounted to the support metal fitting
24
by a bolt.
In supporting the main circuit conductor
26
disposed within the switchgear, the conductor support insulator
21
is secured to the support frame
23
and mounting the support metal fitting
24
to the conductor support insulator
21
by the bolt
25
, forming in the main circuit conductor
26
a mounting hole through which the bolt
27
is passed, and the main circuit conductor
26
is secured by the bolt
27
to the support metal fitting
24
.
With the conventional conductor support insulator, the main circuit conductor was supported as above described, so that, when the main circuit conductors
15
or
26
disposed within a switchgear is to be supported, a mounting hole must be formed in the main circuit conductor
15
or
26
both in the first and the second conventional insulators, Also, in the second conventional insulator the support metal fitting
24
must be used.
Further, both in the first and the second conventional insulators, the bushing
12
or
22
must be embedded within the conductor support insulator
11
or
21
, thus increasing the cost and, when the main circuit conductor
15
or
26
which is an insulated conductor is to be supported, the bushings
12
or
22
are at intermediate potential which may lead to the insulation breakdown, causing a problem of failure in maintaining a necessary electrical insulation performance. Therefore, to cope with this problem, the insulation is removed from the fixed portion to make it at the same potential as the bare live portions but this raises another problem of difficulty in decreasing the space insulation distance with respect to the main circuit conductors in other phases and the grounded metal.
Further, in the first conventional insulator, when the conductor support insulator
11
is to be mounted to the support frame
14
, the bolt
13
must be inserted and thread-engaged in the insulator from the back side of the support frame
14
, resulting in a difficult and inefficient operability .
SUMMARY OF THE INVENTION
The present invention has been made in view of the above circumstance and has as its object the provision of an electrical conductor support insulator in which, by providing a hole that can pass and support a plurality of kinds of conductors, no bushing is provided and no securing member such as bolt and support metal fitting is needed and in which various kinds of electrical conductors can be simply and easily supported.
Another object of the present invention is to provide an electrical conductor support insulator in which the step portion is made to have a cross-shaped cross section, whereby the amount of the insulating material to be used can be reduced and the cost can be decreased.
Still another object of the present invention is to provide an electrical conductor support insulator in which one portion of the mounting portion to be secured to an external member such as the support frame or the like is formed into a slot having a U-shape, whereby the assembly efficiency can be improved.
With the above objects in view, the electrical conductor support insulator of the present invention is provided with a hole for passing therethrough and supporting an electrical conductor.
In this electrical conductor support insulator, one or a plurality of conductors are passed through and supported in the hole. Therefore, the conductors disposed within a switchgear can be easily supported without using a special member such as the bolt or the support metal fitting as used in the conventional insulator. Also, no bushing is used, so that the space insulation distance can be reduced and the insulated conductor can be held as it is.
An edge of the hole may be formed into a curved configuration in which patterns are partially different for passing through and supporting a plurality of electrical conductors of different configurations.
With this electrical conductor support insulator, the hole configuration is selected so that its fits to various kinds of conductors. Therefore the various conductors can be supported and various conductor arrangements within the switchgear can be realized.
The configuration of a stem portion may have a cross-shaped cross section.
With this electrical conductor support insulator, the stem portion of the insulator may have a cross section of the cross-shape in order to maintain the strength. Therefore, the insulating material used can be reduced as compared to the stem of cylindrical shape.
A fixed portion for being fixed to an external body may be provided, and one portion of the fixed portion may be formed into a slit of a U-shape.
With this electrical conductor support insulator, the fixed portion to be fixed to the external body may be formed into the slit of the U-shape. Therefore, the mounting operation of the conductor support insulator to the external body can be achieved from the insulator side, resulting in an improvement in the operation efficiency.
REFERENCES:
patent: 971785 (1910-10-01), Pierce
patent: 1920978 (1933-08-01), Fort
patent: 2174723 (1939-10-01), Hocher
patent: 2219727 (1940-10-01), Stewart
patent: 2269409 (1942-01-01), McChesney, Jr.
patent: 3300576 (1967-01-01), Hendrix et al.
patent: 3739075 (1973-06-01), Jean et al.
patent: 4941834 (1990-07-01), DeLeo
patent: 6222133 (2001-04-01), St. Louis
patent: 6248956 (2001-06-01), Cook et al.
patent: 1265262 (1968-04-01), None
patent: 1 265 262 (1968-04-01), None
patent: 3428550 (1986-02-01), None
patent: 195 39 454 (1997-01-01), None
patent: 19539454 (1997-01-01), None
patent: 119 4113 (1959-11-01), None
patent: 122 2403 (1960-06-01), None
patent: 127 1237 (1962-01-01), None
patent: 2308173 (1976-11-01), None
patent: 2 308 173 (1976-11-01), None
patent: 62-131313 (1987-08-01), None
patent: 4-114721 (1992-10-01), None
Arioka Masahiro
Hashizume Aiichiro
Nishitani Junichiro
Okuno Michiharu
Takeshita Masaaki
Lee Jinhee J
Mitsubishi Denki & Kabushiki Kaisha
Reichard Dean A.
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