Robert Boschgmbh

Hauni Maschinenbau Ag

Erich Vogel

Heribert Schramm

Matthias Horn

Steffen Wunsch

Frank Grothaus

Dieter Grozinger

Dietmar Janz

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.

Hammer drill

Growing community of inventors

Bernhausen, Germany

Erich Vogel