The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 2006
Filed:
Nov. 23, 2005
Yasushi Ohkawa, Nagoya, JP;
Itsushi Nakamura, Aichi, JP;
Yasushi Ohkawa, Nagoya, JP;
Itsushi Nakamura, Aichi, JP;
NGK Insulators, Ltd., Aichi, JP;
Abstract
A polymer SP insulator comprising an FRP core, a sheathhaving a plurality of shedsprovided on outer periphery of FRP core, and metal-end-fittingscrimped to upper and lower ends of FRP core, in which a flat platefor adjusting the overall length dimension after crimping the metal-end-fittingis assembled in the inner bottom of the metal-end-fitting, and the overall length dimension is uniformly adjusted by the thickness of the flat plate. Further, a stress concentration portion such as cross groove is provided in the outer bottom of the lower Metal-end-fitting, and prevents instability by deformation of flangewhen crimping the Metal-end-fitting. In this configuration, in spite of the structure of crimping metal-end-fittings at upper and lower ends of the FRP core, the overall length tolerance, parallelism and eccentricity can be suppressed. In order to assure the flashover distance economically, preferably, the diameter of sheds of at least highest position and lowest position is larger than the diameter of intermediate shed.