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:
Mar. 23, 1982
Filed:
Sep. 01, 1977
Gerhard Grieger, Berlin, DE;
Joaquin Bohrdt, Berlin, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
An improved 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 electric switching apparatus. The actuator has a cylinder and a differential piston movable in the cylinder between first and second end-positions corresponding to the open and closed positions of the switching apparatus. The differential piston has two end-faces for receiving fluid pressure force. One of the two end-faces has a surface area greater than the other one of the two end-faces. A high-pressure fluid supply supplies fluid to the two end-faces and a valve alternately interrupts and passes the fluid from the fluid supply to the one end-face whereby the differential piston is caused to move from the first end-position to the second end-position when the valve passes fluid to act upon the one end-face of the piston. Means are provided for reducing the quantity of the fluid supplied to the one end-face in the course of the movement of the differential piston to the second end-position from the first end-position and before the second end-position is reached.