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:
Jan. 11, 2011
Filed:
Nov. 29, 2006
Erik Rondahl, Åkersberga, SE;
Erik Rondahl, Åkersberga, SE;
Dentatus AB, Hagersten, SE;
Abstract
A hand-held power tool, e.g. a high speed file or polisher has a single rotary drive shaft () to which there is locked a first eccentric member () in which a second eccentric member () can be rotated and locked forming a first assembly (). The second eccentric member has an eccentrically placed crank pin in the form of a hollow needle bearing ring () through which the drive shaft passes. The outer ring () of the needle bearing reciprocally drives a connecting rod () to a tool holder (). The drive shaft also passes through an identical assembly () of first and second eccentric members (') disposed upside down on the first assembly () and reciprocally driving, in the opposite direction and in counterphase, a counterweight, to cancel the reactive oscillating forces from the tool holder during operation, which would otherwise have to be absorbed by the hand and aim of the operator. Relative rotational adjustment of the first (′) and second (′) eccentric members simply changes the length of stroke of the tool holder and the counterweight, respectively,