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. 20, 1976
Filed:
Jul. 02, 1973
Gerhard Grieger, Berlin, DT;
Joaquin Bohrdt, Berlin, DT;
Siemens Aktiengesellschaft, Munich, DT;
Abstract
A fluid actuating device for an electric switching apparatus such as a high-voltage power circuit breaker or the like includes an actuator for actuating the switching apparatus. The actuator in turn is made up of a cylinder and an actuator differential piston movable in the cylinder between positions corresponding to the open and closed positions of the switching apparatus. A fluid supply provides fluid under high-pressure to the end-faces of the actuator differential piston. A main-valve arrangement includes a main-valve differential piston movable for alternately interrupting and connecting fluid from the fluid supply to one of the end-faces of the actuator differential piston whereby the actuator differential piston is caused to move between its end positions. The main-valve differential piston also has end-faces fluidly connected to the fluid supply. A control valve arrangement includes a control differential piston which interrupts and connects the fluid supplied to one of the end-faces of the main-valve differential piston thereby actuating the same. A control arrangement actuates the control differential piston in response to inputs for opening and closing the switching apparatus. The main-valve differential piston and the control differential piston are actuable exclusively by the pressure of the fluid from the fluid supply and this enables the two last-mentioned pistons to maintain their end positions independent of the instantaneous value of the pressure of the fluid.