Abstract: A surgical instrument (1) with a grip part (2), which is provided with a working part (26), which has a tool part in an end area and is provided with a slide (57). The slide (57) is adjustable in relation to the working part (26). The adjusting movement (double arrow 18) brings about a working movement of the tool part. The adjusting movement (double arrow 18) can be brought about by an actuating drive (6, 7, 8, 9, 10), which can be activated by an actuating element (38), which can be actuated manually. To attain the strongest possible actuating forces, a control means (35) is provided, which can be controlled via the actuating element (38) and by which the actuating drive (6, 7, 8, 9, 10) arranged in the area of the grip part (2) can be actuated. The actuating drive (6, 7, 8, 9, 10) now brings about the working movement of the slide (57) depending on the position of the actuating element (38) and is mechanically coupled with the slide (57) via a lever mechanism (10).

Abstract: A drilling assisting device for a drill used for diamond drilling, has a supporting element, a unit for mounting on a drill arranged on the supporting element at a machine side, a support part for supporting the drill on a surface to be treated and also mounted on the supporting element at a tool side, the unit for mounting on the drill having a carriage, a dove-tail unit for setting the carriage on the drill, and a bolt unit mounting the carriage on the drill.

Abstract: A support apparatus for a hand guided drill tool, especially a drill tool having diamond cutting elements, is provided. The support apparatus includes a movable support arm having at its free end a stand off piece for receiving and guiding a drill bit relative to a surface to be drilled. The movable support arm is telescopically movably mounted to a base element which has a travel stop member for engaging the support arm to prevent further extension thereof beyond its fully extended position. A damping element comprised of two plate shaped elastomeric portions is mounted on the support arm to damp the engagement of the support arm by the travel stop member and thereby avoid undesirable damage and collision noises.