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:
Oct. 19, 1976
Filed:
May. 12, 1975
Joseph R Rostron, Monroeville, PA (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
A puffer-type gas-blast circuit-interrupter is provided having an operating cylinder movable over a fixed composite piston structure, the fixed composite piston structure providing a variable cross-sectional area by means of a secondary piston area, preferably annular in configuration, which is releasably latched in a fixed forward position, and, subsequently, during the opening operation of the breaker, collapsed to a retracted position. The composite piston arrangement may be such that upon collapse of the secondary 'fixed' piston, the diameter of the surrounding movable operating cylinder may be such as to closely surround the central area of the primary fixed piston structure to retain high-pressure gas within the piston-compression chamber without loss. There results, by the utilization of the variable-area fixed composite piston structure, an improved interrupting performance of the circuit-interrupter by giving very high gas pressures early in the opening stroke of the circuit-interrupter, as compared to prior-art conventional structures, which provide such high gas pressure only at a later time in the opening stroke by conventional piston means.