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:
Dec. 28, 1993
Filed:
Aug. 24, 1992
Herve Varin, Ballan, FR;
Hutchinson, Paris, FR;
Abstract
An automatic tensioner for a synchronous transmission toothed belt, including a roller adapted to cooperate with the belt and an actuator comprising within a cylindrical body: a piston pierced by a multiplicity of channels delimiting therein a pressure chamber and a supply chamber for a hydraulic fluid, a push rod secured to the piston and whose motion is suitable for being transmitted to the roller, a compression spring urging the piston towards the supply chambers, and a non-return valve received in the pressure chamber to open or close said channel, thereby allowing or preventing hydraulic fluid to pass between the pressure chamber and the supply chamber, when a lip of said valve comes into contact with or moves away from its seat in order to close or open said channels.