Vibration dampened hand-held power tool

Details Vibration dampened hand-held power tool Vibration dampened hand-held power tool

2011-01-11

2011-01-11

Durand, Paul R (Department: 3721)

Tool driving or impacting

Drive by means reacting to rotating eccentric mass

C173S122000, C173S162200

Reexamination Certificate

active

07866411

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,

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DataBase WPI Week 198436 Derwent Publications Ltd., Lond GB, Class P54, AN 1984-223960 & SU 1065107 A (Gerasimov B I), Jan. 7, 1984.
DataBase WPI Week 198409 Derwent Publications Ltd., London, GB; Class Q62, AN 1984-054711 & SU 1013641 A (AS UKR Phy Mech Inst), Apr. 23, 1983.

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