Vibration dampened hand-held power tool
US7866411B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 2006 |
| Grant date | Jan 11, 2011 |
| Priority date | — |
| Expiry date | Mar 6, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23D51/16
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A hand-held power tool, e.g. a high speed file or polisher has a single rotary drive shaft (8) to which there is locked a first eccentric member (1) in which a second eccentric member (2) can be rotated and locked forming a first assembly (10). The second eccentric member has an eccentrically placed crank pin in the form of a hollow needle bearing ring (2a) through which the drive shaft passes. The outer ring (7) of the needle bearing reciprocally drives a connecting rod (1.2) to a tool holder (9). The drive shaft also passes through an identical assembly (10f) of first and second eccentric members (1′, 2′) disposed upside down on the first assembly (10) 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 (1, 1′) and second (2, 2′) eccentric members simply changes the length of stroke of the tool holder and the counterweight, respectively,
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.