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:
Nov. 21, 1995
Filed:
Dec. 23, 1992
Richard N Fargo, Plainville, CT (US);
William A Wurts, Wethersfield, CT (US);
Otis Elevator Company, Farmington, CT (US);
Abstract
An apparatus and a method for reducing seal stiction is provided. In the method, a first step provides a fluid cylinder comprising a piston displacably mounted in a housing containing pressurized fluid is provided in the first step. The housing has first and second seals in register with the piston. In a second step, the second seal is applied to maintain pressure within the housing when the piston is in a static state. In a third step, the first seal is applied to maintain pressure within the housing and the second seal relaxed prior to displacement of the piston. In a fourth step, the second seal is applied to maintain pressure within the housing and the first seal relaxed subsequent to the displacement of the piston. An apparatus is provided for applying one of the first or second seals and relaxing the other of the first or second seals, before and after displacement of the piston.