Abstract: A rock drill (1) for cutting rock comprising an elongated, helical shaft (2), which has, at one end, an insertion part (3) and, at the end opposite, a tool head (4) with cutters (5) made of hard material, wherein the helical shaft (2) is at least partially coated with a colored layer (7a, 7b) and the layer forms a lengthwise running wear indicator marking (8) inside the helical groove (8).

Abstract: An assembly for a percussion power tool includes a carrying handle (5) and a flush head (4) which is connected with the power tool chuck (3) for flushing a working tool receivable in the chuck and which has an inlet opening (12) for a flushing fluid and communicating with the working tool stem (2), the carrying handle (5) and the flush head (4) forming a functional unit.

Abstract: A support for supporting a power tool (3) on a displacement carriage (2) and including an attachment element (7) for connecting the power tool (3) with the carriage (2), and a bolt insertable into an eyelet (8) of the power tool (9) for releasably connecting the attachment element (7) with the power tool (3) with the bolt (6) having axial and radial conduits (12, 13) communicating with an outer cylindrical surface of the bolt (6), so that predetermined position of the bolt (6) in the eyelet (8), a drilling fluid can be delivered through the bolt (6) to fluid conduits (4) of the power tool (1).

Abstract: A suction drill unit for the installation of a drill dowel (2) into rock, concrete, masonry and similar materials has an insertion end (3) for insertion into an at least partially rotary and percussive acting hand tool drilling device, with a reduced diameter shank (7) having an open suction passageway (9) extending axially through the shank (7) towards a bit head (8) and a rearward radial communication passage (10) connected thereto for suction-tight communication with a non-rotary suction head (11), wherein the drill bit head (8) is formed with an eccentrically arranged bit head tip (12) for boring of a hole (14) having a diameter (D) greater than that of the drill bit head diameter (B).

Abstract: A drill including a body having mortises (7), and a solid hard metal head (4) having a plurality of bits (3) and secured to the drill body over the end surface (5) of the head (4) and additionally secured to the drill body over portions of side surfaces (6) of the bits, which are located in a radially outer region of the head (4), with the side surfaces (6) extending into mortises and including first surfaces, which are associated with at least some of the bits (3) and are subjected to pressure acting in a rotational direction of the drill during operation of the drill.