Chisel holder

摘要

The subject matter of the invention is a bit holder for an earth working machine, in particular a road milling machine, having a support member onto which an insertion projection is indirectly or directly attached on an insertion projection side, the insertion projection comprising at least one convex abutment surface and one pressure surface. In a bit holder of this kind, working forces can be dissipated in stress-optimized fashion into an attached base part when provision is made that the insertion projection comprises two convex abutment surfaces that are arranged at a distance from one another.

主权项

1. A tool apparatus for an earth working machine, comprising:
a support member having an insertion projection side and a working side, the working side facing away from the insertion projection side, the working side defining a bit longitudinal center axis; and an insertion projection attached to the support member and extending from the insertion projection side, the insertion projection having a longitudinal insertion axis, the bit longitudinal center axis of the working side being inclined forwardly relative to the longitudinal insertion axis of the insertion projection to define a forward tool advance direction, the insertion projection including:
at least two convex abutment surfaces circumferentially separated from one another and arranged in front of the longitudinal insertion axis with reference to the tool advance direction; andat least one pressure surface arranged behind the longitudinal insertion axis with reference to the tool advance direction;wherein the at least two convex abutment surfaces are circumferentially separated from one another b a recess defined in the insertion projection.