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. 16, 2002
Filed:
Feb. 05, 2001
Yannick Frank Theophile Emile Christiaens, Chanteau, FR;
Loic Jean Bernard Bouyer, Paris, FR;
Patrick Desbois, Olivet, FR;
Automotive Products France, SA, Chevilly, FR;
Abstract
A hydraulic cylinder has a piston ( ) with a seal ( ) in sealed sliding contact within a bore ( ) to define a working chamber ( ) ahead of the piston for the discharge of pressurised fluid from the bore via an outlet ( ) when the piston is undertaking working stroke, an inlet ( ) is provided into the bore from an associated reservoir to allow connection between the reservoir and the working chamber when the piston is in a fully retracted state for recuperation of fluid from the reservoir to the working chamber. The connection between the reservoir and working chamber is provided via a sleeve ( ) in the bore ( ) winch includes axially extending grooves ( ), the grooves being closed by the piston seal ( ) during a working stroke of the cylinder but the ends ( ) of the grooves being open when the piston ( ) is in a fully retracted condition within the sleeve thus by-passing the piston sleeve to connect the working chamber and reservoir. The sleeve ( ) may also have a secondary function of providing an abutment ( ) for a return spring ( ) which returns the piston to its fully retracted position when an operating pedal ( ) associated with the piston ( ) is released.