Rotary impact tool

Details Rotary impact tool Rotary impact tool

2011-07-05

2011-07-05

Nash, Brian D (Department: 3721)

Tool driving or impacting

Impacting devices

Hammer head driven by relatively moving motion transmitting...

C173S090000, C173S104000, C173S117000

Reexamination Certificate

active

07971654

ABSTRACT:
A rotary impact tool includes a drive shaft rotationally driven by a rotational drive power source, a hammer arranged around the drive shaft, a ball engaging with a cam groove formed on the outer circumferential surface of the drive shaft and a cam groove formed on the inner circumferential surface of the hammer, an anvil engageable with the hammer along a rotational direction and a spring for biasing the hammer toward the anvil. The hammer is designed to rotate along a rotational locus decided by the cam groove of the drive shaft and the cam groove of the hammer. The rotational locus of the hammer as seen in a development view describes a curve in which the lead angle of the rotational locus varies continuously with the change in hammer rotation angle.

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European Search Report dated Feb. 3, 2010.

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