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:
Jul. 25, 1978
Filed:
Sep. 20, 1976
Rudolf Graf, Oberentfelden, CH;
Ernst Lang, Schlossrued, CH;
Viktor Stephanides, Zurich, CH;
Richard Thaler, Unterentfelden, CH;
Hans-Rudolf Wuethrich, Oberentfelden, CH;
Sprecher & Schuh Ltd. (SSA), Aarau, CH;
Abstract
A puffer-type interrupter for a circuit breaker has a stationary piston received in a movable cylinder which is connected to the movable contact of the interrupter, and which also carries a nozzle for producing a blast of gas through the separating contacts of the interrupter when the cylinder is moved over the piston. An auxiliary piston is slidably mounted relative to the main piston, and mechanism is provided to connect the two pistons together when the interrupter contacts are closed, and to connect the auxiliary piston to the movable cylinder after the contacts have separated. The main pressure chamber within the cylinder and the fixed piston is connected to an auxiliary pressure chamber disposed between the main piston and the auxiliary piston in such a manner that, as the separating contacts reach an optimum separation for contact interruption, the pressure within the main cylinder can drop to a preselected value by pressure flow into the intermediate chamber between the main piston and auxiliary piston, thereby to control the force characteristic required for the operation of the interrupter.