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:
Jun. 06, 1978
Filed:
Jul. 31, 1975
Richard J Bohinc, Hempfield Township, Westmoreland County, PA (US);
Charles W Tragesser, Murrysville, Westmoreland County, PA (US);
Ronald E Vaill, Penn Township, Westmoreland County, PA (US);
Francis R Racki, O'Hara Township, Allegheny County, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
An improved oil-pumping piston-assembly is provided for an oil-type circuit-interrupter to improve the interrupting performance during low-current conditions, having an improved hydraulic-dashpot action occurring during charging and discharging oil, incorporating, additionally, a 'floating' piston design, and reducing the mechanical impulse forces exerted on the cylinder when high-current interruptions are made with an improved check-valve construction. The improved oil-pumping piston-assembly of the present invention is particularly adapted for the inclusion therewith of an auxiliary shunting separable-contact structure, which will, when desired, increase the current-carrying capability of the circuit-interrupter. Its inclusion, or exclusion, is optional, depending upon the current rating desired by the utility customer. Also, the improved oil-pumping piston-assembly provides an improved check-valve construction, which will admit clean oil into the pumping cylinder from the clean-oil region externally of the grid structure, by an improved check-valve structure located at a position between the pumping-cylinder reservoir and the lower end of the pumping housing, through which oil inlet passages are provided for the entrance of such clean oil into the pumping cylinder.