Abstract: A hand-operated toolholder for a chisel (1) and including a holding member for operating a chisel and having a protection flange at its end facing in a direction opposite to an operational direction (B), a tubular guide (2) for axially guiding the chisel (1) and received in the holding member (3), and a locking mechanism (6) cooperating with the tubular guide (2) for retaining the chisel in the guide.

Abstract: A rock drill (1) with a helical thread (2) and a hard material insert (3, 9) in the drilling head, form a radically outer guiding surface (6), with the guiding edge (6) forming an acute angle (&agr;) with the direction of the tool axis (A).

Abstract: A hand-operated toolholder for a chisel (1) and including a holding member for operating a chisel and having a protection flange at its end facing in a direction opposite to an operational direction (B), a tubular guide (2) for axially guiding the chisel (1) and received in the holding member (3), and a locking mechanism (6) cooperating with the tubular guide (2) for retaining the chisel in the guide.

Abstract: A tool bit chuck for holding a bit (1) with axially extending grooves (2) closed at the ends thereof spaced apart in the axial direction. Latching elements (4) in the form of cylinders are radially displaceable into and out of the grooves (2). The latching elements (4) have an axis of rotation extending transversely of the axis of the receiving sleeve (3) in the chuck, whereby the latching elements (4) act as roll bodies in the event of an axial shift between the bit (1) and the receiving sleeve (3) so that friction which could result in premature wear, is prevented.

Abstract: A tool bit chuck for a bit (1) having axially extending latching grooves (2) closed at the opposite ends spaced apart in the axial direction, and axially extending rotary entrainment grooves (3) open at the trailing end of the bit. The chuck has entrainment elements (8) and radially displaceable latching elements (8). The latching elements (4) provide axially directed retention of the bit (1), while the entrainment elements (8) transmit torque to the bit (1). The entrainment elements are shaped as roll bodies, such as cylinders, to prevent wear caused by friction.