Abstract: An insulator including an insulator body, a metal fitting secured to the insulator body via cement material, a conductive layer provided on the insulator body, the conductive layer including a first exposed portion and a second portion embedded in the cement material, and a conductive covering film provided on the second portion of the conductive layer. A conductive grain layer is on the second portion of the conductive layer and is covered by the conductive covering film. According to the present invention, the conductive covering film is more flexible than the second portion of the conductive layer. The present insulator has a simple construction, is easy to produce, and assures continued electrical conduction through the cement material over time.
Type:
Grant
Filed:
November 22, 1995
Date of Patent:
August 18, 1998
Assignee:
NGK Insulators, Ltd.
Inventors:
Yoshihiro Suzuki, Eiji Kutsuna, Hiroshi Nozaki, Shigeo Mori