Abstract: A positioning aid (1) for a hand tool device (3) driving tool (2), in a working direction (A), with a distance measuring system (4) mounted thereon. The distance measuring system (4) has at least one distance measuring sensor (5) for measuring the distance from the distance measuring sensor (5) to an object (6), along a line of measurement (M, M′, M″), and a computing unit (7) for comparing the measured value with a pre-selected desired value (S) and for producing a signal dependent on the comparison, wherein the line of measurement (M, M′) is oriented at least partially perpendicular to the working direction (A).

Abstract: A hand tool device (1), for an at least partially rotationally driven drill tool (2), comprising an electronic depth stop (3) with a sensor (4) for non-contacting gauging of a distance and a calculator component (5) for calculating the depth (T) of a drill bit tip (8) relative to a reference surface (10), and signaling when a measured value attains a set value (S), whereby the set value (S) can be transmitted into a set value memory (6), using a single manually operated transfer accept actuation means.

Abstract: A hand-held rotary-percussion power tool including an electrical drive (2) for generating a torque transmittable to a boring tool used with the power tool for forming blind bores, a hammer mechanism (3) for applying impacts to the boring tool, control device (7, 7′, 7″) for controlling operation of at least one of the electrical drive (2) and the hammer mechanism (3) and an electronic depth stop (4) including a sensor (5) for contactless, distance measuring of a depth of a blind bore, and a computation unit (6) for generating a signal indicating that a sensed measurement value (M) corresponds to a set value of the depth of the blind bore, and connected with the control device (7, 7′, 7″).

Abstract: A microcontroller for controlling operation of a safety clutch of a handheld electrical power tool and which is arranged in a force transmitting chain of the tool, with the microcontroller including a unit (2,5,4;8) for processing at least one parameter of the power tool and for outputting a resulting parameter in form of a calculated torque (M1), and a control unit (7) for comparing an actually measured torque (M) with the calculated torque (M1), and for outputting a control signal (&thgr;) when a difference between the actually measured and calculated torques exceeds a predetermined threshold.

Abstract: The method of and a device for using this method, on equipment or assigned to equipment for working a material, for investigating and identifying the nature of the material, which is to be worked and for making available at least one operating parameter for the optimized pre-setting of the working equipment, provides for the use of a sensor, preferably assigned directly to the working tool, such as a hammer drill, in order to detect shock waves generated or induced in the tool. From the shock wave signal measured, at least one distinguishing feature characteristic of the material to be worked, is extracted and evaluated for the comparative classification of the material by means of an algorithm. Preferably, an external force, especially the contacting force, acting on the working equipment, is taken into consideration for the algorithmic evaluation.

Abstract: A self-starting brushless electric motor having a first motor (stator) with poles arranged in a row, said poles constituting ferromagnetic poles or permanent-magnet poles, a second motor part (rotor) with poles arranged in a row, said poles consisting of ferromagnetic poles or permanent-magnet poles and being arranged opposite the row of poles on the first motor part, wherein the motor part with salient ferromagnetic poles or, if both motor parts have salient ferromagnetic poles, at least one of the motor parts has a permanent-magnet pole, and also a magnetizing winding on the first motor part. The system of poles formed by the pole rows is magnetically asymmetrical in the direction in which the motor parts are movable in relation to each other.

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 method of determining a time-dependent gradient of a shock wave in a percussion or subjected to a percussion load ferromagnetic element and including subjecting the ferromagnetic element to action of a magnetic flux, providing a voltage measuring instrument associated with the ferromagnetic element for determining a change of a magnetic flux velocity, which is determined as a change in a measuring voltage, during a percussion action, and determining the gradient of the shock wave by additive superimposition of the measuring voltage; and a device for effecting the method.

Abstract: A self-starting brushless electric motor having a first motor part (stator) (11) with poles arranged in a row, the poles constituting ferromagnetic poles (13S) or permanent-magnet poles (14A), a second motor part (rotor) (12) with poles arranged in a row, the poles having ferromagnetic poles (16A) or permanent-magnet poles and being arranged opposite the row of poles on the first motor part (11), wherein the motor part with salient ferromagnetic poles or, if both motor parts have salient ferromagnetic poles, at least one of the motor parts has a permanent-magnet pole, and also a magnetizing winding on the first motor part. The system of poles formed by the pole rows is magnetically asymmetrical in the direction in which the motor parts (11, 12) are movable in relation to each other.

Abstract: A frame conveyed across the network is divided into a plurality of segments with an identical number of bits. All of the bits of a segment are received simultaneously, with each segment of the frame being received sequentially. Very often, the number of bits in the entire frame, will not be an integer multiple of the number of bits in the segment. Therefore the bits of the frame can be unevenly divided into the plurality of segments. The present invention detects the number of bits from the frame that are present in each of the segments, or at least the number of bits of the frame present in the last segment. An FCS function is used to create a segment FCS function which operates on all the bits of a segment at one time. The original FCS function is preferably an 8 bit function, which combines a present 8 bit word with the FCS calculated for previous 8 bit word in order to generate a new FCS for the present 8 bit word and all previous 8 bit words.

Abstract: A self-starting brushless electric motor comprises a first motor part (stator) (11) and a second motor part (rotor) (16), each motor part having plurality of pole units (12U, 12V) arranged in a pole row. The motor parts are supported for relative movement with the pole rows confronting one another across an air gap. The poles of each row include first-type poles (13, 19) and/or second-type poles (14), each row having at least one pole type, either a reluctance pole or a permanent-magnet pole magnetized transversely across the air gap, which is included in all pole units of the row. At least one of the pole rows includes such a second-type pole. At least one pole unit of at least one of the pole rows includes a pole which is magnetically asymmetric to establish a preferential direction of rotation of the motor parts (11, 16). A polyphase winding system comprises first-phase and second-phase winding coils (15U, 15V) disposed around the pole units (12A, 12V) of the first motor part (11).

Abstract: A method of and an apparatus for preventing accidents caused by blockage of a rotatable tool when working with a hand-held tool including the rotatable tool (8), a drive motor (7) for driving the rotatable tool (8), and means (5, 6) for interrupting transmission of a drive torque from the drive motor (7) to the rotatable tool (8) dependent on an operational condition of the hand-held tool, with the method including determining the operational condition of the hand-held tool by measuring displacement of the hand-held tool in space in at least two points of the hand-held tool spatially spaced from each other and spaced from a tool axis; subtracting two obtained displacement measurement variable (a.sub.1, a.sub.2) from each other; and thereafter, calculating an actuation signal that actuates the interrupting means (5, 6); and with the apparatus including sensors and an evaluation circuit for implementing the method.

Abstract: A method of reducing feedbacks on a temporary flow of current drawn from a network, during an operation of an inductive load, by active filtering of harmonics of a network fundamental component with a booster converter (6) and according to which the function of a necessary choke of the booster converter is taken up, at least partially, by the inductive load; and a booster converter for effecting the method, in which the function of the booster converter is integrated into the inductive load driving bridge circuit and into the motor, with at least one motor winding being so connected that it replaces, at least partially, the conventional booster converter choke.