Impact-type expansible plug for anchoring in a cylindrical drilled hole

An impact-type expansible plug for anchoring in a cylindrical drilled hole of a concrete part and the like, comprising an expansion sleeve provided with at least one longitudinal slot and expandable in a drilled hole, said expansion sleeve having a conically narrowing internal bore;

• and an expansion mandrel drivable into said conically narrowing internal bore of said expansion sleeve, said expansion sleeve having a forward end provided with an annular collar having a radially directed circumferential cutting edge, said expansion sleeve having a portion tapering toward said annular collar, said expansion mandrel having a conical extension which during an expanding process engages in said conically narrowing internal bore of said expansion sleeve, said conical extension having an outer surface which extends at a flatter angle relative to a central axis of said expansion mandrel than said conically narrowing internal bore of said expansion sleeve in an unexpanded state.