Abstract: A controllable planetary gear for transmitting a rotational movement between an input (2) and an output (3), including a ring gear (4) with which a speed range of the transmitted rotational movement is controlled; and a control device (6, 61) having an inner member (5, 51) in which the ring gear (4) is integrated, an outer member (7, 71) supportable in the tool housing (3) without a possibility of rotation relative thereto, and a sensor (8, 81) for measuring a force acting on the outer member (7, 71) and a tension developed in the outer member (7, 71).

Abstract: An electrical hand-held power tool including an electrical drive (2) for transmitting a torque to a working tool (3) rotatable about an axis (a), a sensor (4) for determining an actual torque transmitted to the working tool (3), a control unit (5) for controlling operation of the electrical drive (2), a microcontroller (6) connected with the torque sensors (4) and the control unit (5), and a transceiver (7) for reading in identification data contained in identification data (9) associated with a fastening element (9) located in a corresponding transmission range, container for transporting fastening elements, and identification data carrier, and connected with the microcontroller; and a method of controlling the torque transmitted to the working tool (3).

Abstract: A rock drill including a drill stem (2), major cutting edges (5, 6) extending substantially over a diameter of the drill stem (2) and projecting beyond the end face (3) of the drill stem, and at least one minor cutting edge (9, 10) extending substantially in a radial direction and provided on at least one elongate cutting body (7, 8) which projects beyond the end face (3), with the minor cutting edge (9, 10) being located, at a contemplated rotational direction (R) of the drill (1) about the drill axis (A), in front of a corresponding major cutting edge (5, 6) adjacent to a main discharge groove (13) for drilling dust, and with the elongate cutting body (7, 8) having a cutting surface (11) tapering from the minor cutting edge (9) toward the end face (3) of the drill stem (2) and having at least one inclination surface (12) adjacent to the circumference of the drill stem (2) and inclined toward the circumference of the drill stem and with respect to a radial extension of the minor cutting edge (9), in a direct

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: A drill including an elongate shaft (2) a rear end (5) of which is formed as a shank, and a drilling head (10) provided at the front end of the shaft (2) and having central cutting edges (11, 12) extending from a leading center point (14), which is provided substantially at an extension of a shaft axis, backward toward a circumference of the drilling head, and at least one minor cutting edge (13) a portion (n) of which extending transverse to the shaft axis projects beyond a circumference of the shaft (2), with the projecting portion (n) having a length equal from about 10% to 100% of an entire length of the minor cutting edge.

Abstract: A manually operable tool, such as a hammer drill, for drilling and/or removing material in at least one of brittle material and low ductile material, has a continuously rotatable chuck (8) and a motor driven striking mechanism (1) for transmitting impulse-like blows to a tool bit (9) held in the chuck (8). The tool includes members (5) for transmitting impulse-like blows composed of superimposed axially-directed blows and torsional blows to the tool bit (9) in the chuck for forming drilling blows. Further, an adaptor can be provided for attachment to the hammer drill containing the members (5) for affording the superimposed blows.

Abstract: The present invention discloses a method and an apparatus which enables one to obtain definite non-modulo-2.pi.-dependent measurements wherein a method for the fiber-optic measurement of force, which is based upon the strain-induced birefringence of a single-mode light waveguide, provides a compensation method for the phase differences of two linear modes of the exiting light waves, which are caused by the force acting on the light waveguide and the consequent change in birefringence. In one embodiment of the method, a liquid crystal cell, the birefringence effect of which can be controlled electrically, is used as a compensation element. The maximum of an autocorrelation function, which occurs as an image, and the respective voltage at the liquid crystal cell, are evaluated as a measurement for the birefringence which is to be compensated for and, accordingly, for the effective force.

Abstract: A method and the device for fiber-optic measurement of the absolute value of the pretensioning in a highly loaded mechanical structural component part are based on the measurement of the phase displacement of a light wave caused by the strain-induced birefringence in a single-mode light waveguide 4 which is embedded between two metallic disks or washers 3a, 3b. Since the measurement results are ambiguous modulo-2.pi., serial or simultaneous measurement with two light wavelengths .lambda..sub.1, .lambda..sub.2 is used according to a first method variant of the invention. The quantity of 2.pi. periods can be unequivocally determined within a predetermined measuring range by means of comparing the two measurement results. The evaluation is preferably effected according to a quadrature or phase step method, known per se. According to second method variant, the light waveguide 4 is irradiated with polarized white light.