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:
Feb. 07, 1978
Filed:
Nov. 12, 1975
Walter Bischofberger, Zurich, CH;
Gerhard Mauthe, Birmenstorf, CH;
BBC Brown, Boveri & Company Limited, Baden, CH;
Abstract
An electrical switch is provided with at least one set of stationary and movable main contacts for opening and closing the circuit controlled by it, and a set of stationary and movable auxiliary contacts for connecting a resistor in parallel with the main contacts and hence into the circuit controlled by the switch during a switching-in operation prior to engagement of the main contacts. The resistor is then disconnected either after the main contacts have engaged, or it is disconnected later during a switching-out operation prior to dis-engagement of the main contacts. Both operational modes are effected by means of a follower device which couples the movable auxiliary contact with the movable main contact.