Rotary impact apparatus

Details Rotary impact apparatus Rotary impact apparatus

1987-08-12

1989-02-21

Yost, Frank T.

Tool driving or impacting

Impacting devices

With anvil arranged to transmit torsional impact to tool

464 44, B25D 1500

Patent

active

048057061

ABSTRACT:
A rotary impact apparatus comprises an input shaft capable of attachment to an electric drill and arranged to drive an impact assembly through a cone clutch and an output shaft capable of being driven by the impact assembly. The clutch is adjustable by means of a nut and a spring to vary the torque at which drive to the output shaft is disengaged. The impact assembly comprises two rockers adopted to drive the output shaft in respective directions. Each rocker is biased out of engagement with the output shaft by a rocker spring but is unbalanced and rotation of the impact assembly through the clutch by the input shaft creates a centrifugal force on it against the rocker spring whereby it engages the output shaft to rotate the output shaft until resistance to rotation is such that the clutch disengages and rotation of the impact assembly stops. The rocker spring then biases the rocker out of engagement with the output shaft, thereby allowing the clutch and impact assembly free rotation until the sequence is repeated.

REFERENCES:
patent: 1835168 (1931-12-01), McKean
patent: 2261204 (1941-11-01), Amtsberg
patent: 2527517 (1950-10-01), Barker et al.
patent: 2886997 (1959-05-01), Madsen
patent: 4429775 (1984-02-01), Teramoto
patent: 4537264 (1985-08-01), Schmid et al.

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