Hammer drill

Details Hammer drill Hammer drill

1974-04-18

1976-05-11

Purser, Ernest R.

Tool driving or impacting

Drive controlled by relative axial movement of tool

173 48, 173 97, B25D 1110, E21C 102

Patent

active

039556280

ABSTRACT:
A driven output shaft is mounted in a housing and has freedom of limited axial displacement between a first and a second position. A biasing spring permanently biases the output shaft to the first position. An impact member surrounds the output shaft and has a plurality of angularly spaced first axial projections which interdigitate with angularly spaced second axial projections provided on a disk member axially fixed on and turnably surrounding the output shaft. A retaining arrangement is provided in the housing and is engageable with the disk member to prevent rotation of the same when an axial force is exerted upon the output shaft counter to the action of the biasing spring, causing axial displacement of the output shaft to the second position thereof, and engagement of the disk member with the retaining arrangement.

REFERENCES:
patent: 2191608 (1940-02-01), Coates
patent: 3256946 (1966-06-01), Jansen et al.
patent: 3395765 (1968-08-01), Schnettler

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