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:
May. 22, 2007
Filed:
Apr. 12, 2005
Sven Ludsteck, Reichenbach, DE;
Dieter Gebauer, Geldersheim, DE;
Boleslaw Tulaczko, Schonungen, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A hydraulic cylinder includes a housing having a fluid connection for connecting to a hydraulic system and an after-running connection for connecting to a fluid after-running vessel, and a piston which is axially displaceable in the housing to define a variable pressure space having a gas collecting portion, the piston being fixed against rotation in the housing and having at least one after-running groove which is oriented substantially toward the gas collecting portion. A primary seal arranged in the housing and receiving the piston therethrough is bridged by the after-running groove when the piston is in an extended end position, whereby the gas collecting portion of the pressure space communicates with the after-running connection when the piston is in the extended end position.