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:
Oct. 13, 1981
Filed:
Jan. 02, 1979
Martin Greppmair, Munchen-Lerchenau, DE;
Wittloff Grunwald, Pielenhofen, DE;
Wacker Werke GmbH & Co. KG, Munich, DE;
Abstract
A crank gear with adjustable crank radius for motor driven beating working implements, especially tamping implements, jack hammers, hammer drills and the like, in which the crank pin for the connecting rod is eccentrically arranged with regard to the crank shaft axis and when being adjusted moves in a circular path which is substantially parallel to its plane of circulation and is eccentric with regard to the crank shaft axis. That end of the crank shaft which faces the connecting rod is a crank disc. The crank pin is eccentrically arranged on a clamping or coupling disc which with regard to the crank shaft axis eccentrically engages that end face of the crank disc which faces toward the crank pin. The clamping disc, when in disengaging position, is rotatable from the outside of the crank gear relative to the crank disc and is adapted in a selected operative position to be arrested relative to the crank disc, by means of a tension force pressing the clamping disc against the crank disc.