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. 25, 1988
Filed:
Oct. 30, 1987
Nils V Holmgren, Greendale, WI (US);
Donald R Martin, Waukesha, WI (US);
RTE Corporation, Brookfield, WI (US);
Abstract
A switch apparatus comprising a fixed tubular contact having an inner end, a movable tubular contact having an inner end and being movable between a closed position wherein the inner ends of the contacts overlap and an open position wherein the inner ends of the contacts are spaced apart, a piston fixed to the movable contact for movement thereiwth, a cylinder slideably receiving the piston and cooperating with the piston to define a variable volume pressure chamber which decreases in volume as the movable contact moves from the closed position to the open position, and a housing fixed to the piston and having an inner surface which cooperates with the piston to define an arc chamber containing the inner end of the movable contact, the housing having therein an aperture through which the fixed contact extends when the movable contact is in the closed position, and the arc chamber communicating with the pressure chamber so that gas is forced from the pressure chamber into the arc chamber when the movable contact moves from the closed position to the open position.