Abstract: An expansion anchor has an anchor member (21; 51) that has a longitudinal bore (24), a load application element (25, 55) and an expansion section (22; 52) located between first and second sections (26, 27; 56, 57) of the anchor member (21) and a cross-section of which widens from the first section (26; 56) toward the second section (27; 57; and an expansion sleeve (13; 43) having an axial longitudinal bore (14) with which it is guided over the first section (26; 56) of the anchor member (21; 41) and an expansion region (15) located adjacent to the expansion section (22; 52) of the anchor member (21; 41), with at least one of the anchor member (21; 41) and the expansion sleeve (13; 43) having at least one through-opening (18; 58) for a hardenable mass (31) and which opens into one of the axial bore (54) of the anchor member or the axial bore (14) of the expansion sleeve.

Abstract: A percussion blow added manually operable drilling tool, such as a hammerdrill, has a housing (2) containing an electric motor for rotating a tool bit chuck (9) about its axis, a control device (C) for controlling the rpm of the chuck (9) operated by the electric motor (3) which is activated by a switch (5) located on the exterior of the housing (2), and a percussion blow mechanism for periodically applying axially directed blows to a bit (10) secured in the chuck (9). The electric motor (3) is coupled to a device (12) for measuring the reaction torque. The control device (C) is connected to an evaluation unit (E) which is connected to the device (12) for measuring the reaction torque so that the rpm of the chuck can be regulated from maintaining the measured reaction torque at a maximum.

Abstract: An apparatus for locating magnetizable material (5, 6) within a structure (4) includes a scanning head (1) with a permanent magnet (28) for producing a magnetic field in the structure (4). Two field plates (30, 31), adjacent one another on only one pole face of the permanent magnet (28), are interconnected by a differential circuit and measure the magnetic field of the magnet disturbed by the magnetizable material (5, 6). The differential values measured by the pair of field plates form a differential measured signal for establishing, after differentiation, the location of the magnetizable material (5, 6) within the structure (4). The location of the magnetizable material (5, 6) within the structure can be shown on a monitor (7) of an evaluation unit (3).