Tool holder for hammer drills

Claim 1

A tool holder arranged to receive and secure a tool in a hammer drill, comprising an axially extending guide member, a plurality of locking elements supported in said guide member and said locking elements are radially adjustably positionable relative to said guide member for engagement within closed end recesses in the shank of the tool inserted into the tool holder, an adjustment ring is mounted on said guide member for adjustably positioning said locking elements, said adjustment ring being rotatable relative to said guide member for effecting the radial adjustment of said locking elements, a fixing sleeve axially slidably mounted on said guide member and displaceable between a first position for locking said adjustment ring and a second position for releasing said adjustment ring for rotation relative to said guide member, said adjustment ring can be locked by said fixing sleeve in at least two positions for each complete turn of said adjustment ring relative to said guide member, and a toothed construction is provided on said fixing sleeve and a counter toothed construction is on said adjustment ring so that the inter-engagement of said toothed construction and said counter toothed construction locks said adjustment ring against rotation relative to said guide member, and said toothed construction on said fixing sleeve extends in the axial direction thereof and faces radially outwardly and the counter toothed construction on said adjustment ring extends in the axial direction and faces radially inwardly so that said toothed and counter toothed constructions interengage in a telescoping manner.