Impact tool

Details Impact tool Impact tool

2011-04-05

2011-04-05

Nash, Brian D (Department: 3721)

Tool driving or impacting

Impacting devices

With anvil arranged to transmit torsional impact to tool

C173S109000, C173S093600

Reexamination Certificate

active

07918286

ABSTRACT:
In an impact tool including a spindle, an anvil, and an impact mechanism having a hammer and a coil spring, a restricting portion is provided at a front surface of a large-diameter portion of the spindle so as to receive a rear end of the coil spring and to restrict an inner diameter of the rear end of the coil spring. A ring-shaped groove is formed at a rear surface of the hammer to receive a front end of the coil spring, in a manner which provides an inner cylindrical portion at a rear side of the hammer. A run-off portion is formed in the restricting portion so as to allow the inner cylindrical portion of the hammer to move thereinto, so that the hammer can move backward for a distance corresponding to a depth of the run-off portion.

REFERENCES:
patent: 3841418 (1974-10-01), Biersack
patent: 5601149 (1997-02-01), Kawasaki et al.
patent: 5673758 (1997-10-01), Sasaki et al.
patent: 7048075 (2006-05-01), Saito et al.
patent: 7410007 (2008-08-01), Chung et al.
patent: 7416031 (2008-08-01), Murakami et al.
patent: 2008/0035360 (2008-02-01), Furuta
patent: 2009/0038816 (2009-02-01), Johnson et al.
patent: 2009/0255699 (2009-10-01), Lehnert et al.
patent: A-2003-231067 (2003-08-01), None

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