Plastic and nonmetallic article shaping or treating: processes – Repairing or restoring consumer used articles for reuse
Reexamination Certificate
1998-07-07
2001-06-19
Silbaugh, Jan H. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Repairing or restoring consumer used articles for reuse
C264S036190, C264S036220, C029S887000, C156S098000
Reexamination Certificate
active
06248270
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to a method of repairing a shed portion of a composite insulator having a core portion, a sheath portion arranged on an outer surface of the core portion, and shed portions projected from the sheath portion. In this invention, a term “composite insulator” means a wide concept such that it includes not only a polymer insulator having the core portion made of for example FRP rod but also a polymer hollow insulator, a hollow SP insulator, or the like each having the core portion made of for example FRP cylinder.
(2) Related Art Statement
FIG. 10
is a cross sectional view showing one embodiment of a polymer insulator as one example of a composite insulator to be repaired. In the embodiment shown in
FIG. 10
, a polymer insulator
1
comprises an FRP core
2
, a sheath portion
3
arranged on an outer surface of the FRP core
2
, and a plurality of shed portions
4
projected on said sheath portion
3
. In the polymer insulator
1
mentioned above, the sheath portion
3
and the shed portions
4
made of for example silicone rubber are integrally formed on an outer surface of the FRP core
2
by means of a metal mold not shown. In the case of forming the polymer insulator
1
, it is known that defects such as inclusion of foreign substances and non-cured portion are liable to be generated at a periphery of the shed portion.
As mentioned above, the polymer insulator
1
to be repaired according to the invention has a plurality of shed portions
4
. Therefore, if defects are generated in one shed portion
4
after producing the polymer insulator
1
or during an actual use of the polymer insulator
1
, an overall polymer insulator
1
becomes a defect product and thus is scrapped together with the shed portions
4
having no defects, so that a using efficiency of the polymer insulator
1
is decreased. Moreover, since the overall polymer insulator
1
must be scrapped even if it has many normal shed portions
4
, an amount of scrapped polymer insulators
1
is increased. In addition, if the polymer insulator
1
to be scrapped has a long size, scrapping steps are increased. As a result, labor, cost and so on for scrapping the polymer insulators
1
having defects are also increased.
In order to solve the drawbacks mentioned above, it is possible to think an idea such that the polymer insulator
1
is designed on the basis of a higher safety rate or that a new method of producing the polymer insulator
1
having no defects is realized. However, if the polymer insulator
1
is designed on the basis of a higher safety rate, raw materials are wasted and an amount of the scrapped polymer insulators are increased in the same manner as the above mentioned embodiment in which the overall polymer insulators having defects are scrapped, so that it is not possible to produce the polymer insulator
1
in a highly efficient manner. Moreover, it takes a lot of times and cost so as to realize the new method of producing the polymer insulator having no defects. Therefore, the known techniques can not solve the drawbacks mentioned above basically.
SUMMARY OF THE INVENTION
An object of the invention is to eliminate the drawbacks mentioned above and to provide a method of repairing a shed portion in which only the shed portion having defects can be repaired without wasting normal shed portions.
According to a first aspect of the invention, a method of repairing a shed portion of a composite insulator having a core portion, a sheath portion arranged on an outer surface of said core portion, and a plurality of shed portions projected from said sheath portion, comprising the steps of, cutting out said shed portion having defects from a portion thereof adjacent to said sheath portion, and connecting a new shed portion having the same shape as that of said cut out shed portion to said sheath portion at said cut out portion.
According to a second aspect of the invention, a method of repairing a shed portion of a composite insulator having a core portion, a sheath portion arranged on an outer surface of said core portion, and a plurality of shed portions projected from said sheath portion, comprises the steps of, cutting out partly said shed portion having defects, and connecting a repairing member to said cut out portion.
In this invention, it is possible to repair only the shed portion having defects without wasting the other normal shed portions by cutting out the shed portion having defects from a portion thereof adjacent to the sheath portion, and connecting a new shed portion having the same shape as that of the cut out shed portion to the sheath portion at the cut out portion.
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Kashiwagi Hiroshi
Tani Takao
NGK Insulators Ltd.
Parkhurst & Wendel L.L.P
Poe Michael I.
Silbaugh Jan H.
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