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:
Mar. 12, 1985
Filed:
Nov. 12, 1982
Applicant:
Inventor:
Walter Mittermeier, Stuttgart-Stammheim, DE;
Assignee:
Dr. Ing. h.c.F. Porsche A.G., , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16H / ;
U.S. Cl.
CPC ...
474110 ; 474 91 ;
Abstract
A hydraulic chain tensioner with a hollow piston longitudinally guided in a hydraulic housing which is closed off at the top by a plug provided with an external thread; the plug is pressed into a smooth central bore of the hollow piston and the thread grooves are in communication with the atmospheric air by way of radial channels of the hollow piston, thus permitting a venting of the hydraulic housing; a further venting possibility exists by an excess pressure valve which is built into an ante-chamber disposed parallel to the hollow piston.