Tool driving or impacting – Impacting devices – Hammer head driven by spring
Patent
1999-10-19
2000-07-11
Smith, Scott A.
Tool driving or impacting
Impacting devices
Hammer head driven by spring
173120, 173205, 30167, B25D 1110
Patent
active
060858508
ABSTRACT:
A miniature impact tool in which a cam and cam follower assembly is utilized for moving a striker backward by converting rotary motion of a drive shaft to a linear motion. The striker is in contact with a spring/guide pin (plunger) assembly and is moved away from a surface to be struck during a portion of the rotation cycle of the cam. On further rotation the cam surface is cut away and spring action drives the striker forward, causing impact of a cutting tool (chisel) against a workpiece. A plurality of cam lobe surfaces provides predetermined and reproducible impact forces of the cutting tool on the workpiece, even during vibration of the tool. To minimize damage to the cam and cam follower when the tool is over speeded, an elastomeric cam or a cushioning coating or sleeve prevents adverse contact (such as metal-to-metal contact) between the cam and cam follower.
REFERENCES:
patent: 3022838 (1962-02-01), Mitchell
patent: 3074155 (1963-01-01), Cootes et al.
patent: 3874460 (1975-04-01), Schmid et al.
patent: 5427188 (1995-06-01), Fisher
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