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:
Sep. 09, 2003
Filed:
Sep. 13, 2001
Werner Reinelt, Bochum, DE;
Friedrich-Wilhelm Dannehl, Hagen, DE;
DBT GmbH, , DE;
Abstract
A hydraulic cylinder ( ), especially as a pit prop or moving cylinder unit in underground mining, with a locking ring ( ) arranged on an outer cylinder tube ( ) sealing it at its end with a lead through for an axially movable rod element ( ) accommodated in it. The locking ring ( ) is provided in the lead through surrounding the rod element ( ) with a sealing arrangement ( ) resting on the outer side ( ) of the rod element ( ). The sealing arrangement ( ) has a guide ring ( ) provided with grease grooves ( ) open to the outer side ( ) of the rod element ( ), which can, be supplied with lubricant for the grease grooves ( ) via a lubricant line ( ) accessible on the outside on the hydraulic cylinder ( ) and which is arranged in an accepting groove ( ) formed interlocking ring ( ) between an axially inner and an axially outer collar ( ). The gap ( ) formed between the outer collar ( ) and the rod element ( ) is greater than the gap ( ) between the rod element (( ) and the inner collar ( ) and that the guide ring ( ) is arranged axially inside adjacent to an axial further outward lying O-ring seal ( ).