Abstract: A computer-assisted method for determining dimensional properties of a measurement object using a coordinate measuring machine. An image representation of the measurement object is shown to a user and the user selects a first geometric element of the measurement object, resulting in the display of eligible test features for the selected first geometric element. The eligible test features are automatically determined from a plurality of typical test features stored in a database, by the selected first geometric element being assigned to one of a plurality of predefined measurement elements stored in the database. A defined measurement sequence is generated in a computer-assisted manner based on the test feature selected by the user. Individual measured values are recorded on the first geometric element using the defined measurement sequence.

Abstract: The invention relates to a method and to a circuit arrangement for limiting the starting current for intermediate voltage circuits that have at least one storage capacitor.

Abstract: A protective circuit protects against overheating of the stator windings of an EC motor. The stator windings are connected to a semiconductor output stage which is designed for time-offset control of the stator windings using a driver circuit of a commutation controller. The protective circuit has two redundant sensor circuits, wherein two resistance-dependent sensor elements connected in series are provided in the first sensor circuit and one resistance-dependent sensor element is provided in the second sensor circuit. The first and the second sensor circuits are connected, respectively, to two evaluating circuits separated from each other and cause an interruption of the driver circuit using switch-off means when a system-specific resistance value of the first sensor element or the one sensor element associated with the second sensor circuit is reached.

Abstract: A protective circuit protects against overheating of the stator windings of an EC motor. The stator windings are connected to a semiconductor output stage which is designed for time-offset control of the stator windings using a driver circuit of a commutation controller. The protective circuit has two redundant sensor circuits, wherein two resistance-dependent sensor elements connected in series are provided in the first sensor circuit and one resistance-dependent sensor element is provided in the second sensor circuit. The first and the second sensor circuits are connected, respectively, to two evaluating circuits separated from each other and cause an interruption of the driver circuit using switch-off means when a system-specific resistance value of the first sensor element or the one sensor element associated with the second sensor circuit is reached.

Abstract: The invention relates to a method and to a circuit arrangement for limiting the starting current for intermediate voltage circuits that have at least one storage capacitor.

Abstract: A computer-assisted method for determining dimensional properties of a measurement object using a coordinate measuring machine. An image representation of the measurement object is shown to a user and the user selects a first geometric element of the measurement object, resulting in the display of eligible test features for the selected first geometric element. The eligible test features are automatically determined from a plurality of typical test features stored in a database, by the selected first geometric element being assigned to one of a plurality of predefined measurement elements stored in the database. A defined measurement sequence is generated in a computer-assisted manner based on the test feature selected by the user. Individual measured values are recorded on the first geometric element using the defined measurement sequence.

Abstract: An electronic control circuit for an electronically commutated motor (ECM) is disclosed. A plurality of power transistors controls the ECM, and a reference transistor is formed together with the power transistors on a common support. A control unit is configured to, in a test mode: apply a test current to the reference transistor and one of the power transistors respectively; measure a saturation voltage of the reference transistor and one of the power transistors; evaluate a saturation voltage difference between the measured saturation voltages of the reference transistor and the respective power transistor; evaluate a rate of change of saturation voltage differences between a first iteration of the test mode and a second iteration of the test mode; and determine an expected remaining service life of the power transistors based on the temperature of the support during the test mode and the rate of change of the saturation voltage differences.

Abstract: The disclosure relates to an electronic control circuit for an electric device, in particular designed as a commutation electric system of an EC motor, having a plurality of power transistors which are controlled in an operating mode for controlling the device. An additional, similar, non-charged reference transistor in the operating mode of the power transistors is arranged or formed together with the power transistors on a common support or substrate.

Abstract: A replaceable chuck for a percussion hand-held power tool (3) for applying axial blows to a working tool receivable in the chuck, includes a release sleeve (4) axially displaceable relative to the base body (6) against a spring-biasing force and including an inwardly located locking element (11) for formlockingly securing the chuck on a power tool spindle (15) with locking elements (12) extending through respective openings (13) formed in a base body (6) and engageable in associated recesses (14) of the power tool spindle (15), and a formlocking displacement guide (5) that provides for displacement of the release sleeve (4) relative to the base body (6) and includes, along its axial extension, a tangential section.

Abstract: A motor-driven saber saw includes a guide device releasably connectable with the saw housing (11) in a region of the neck (13) and including a guide element (21) for guiding the saber saw (10) over a workpiece, a connection device (22) for connecting the guide element (21) to the housing (11) and having at least one connection part extending along an axis (A) and connectable with the neck (13), with the guide element (21) being supported on the at least one connection part (24) for displacement along the axis (A), and with the guide device (20) further including at least one spring element (27) located between the at least one connection part (24) and the guide element (21).

Abstract: A hand-held power tool includes a motor (13) for driving the cutting or grinding tool (11), a fan (15) for cooling the motor (13), a protective cover device (30) for at least partially covering the cutting or grinding tool (11), and a guide shoe (20) for placing the hand-held power tool on a to-be-treated workpiece and having a tool opening (26) for the cutting or grinding tool (11) and at least one air guide channel (21) having at least one inlet opening (22) for connecting the air guide channel (21) with the fan (15) and at least one blow-out opening (23) arranged sidewise of the tool opening (26).

Abstract: A replaceable chuck for a percussion hand-held power tool (3) for applying axial blows to a working tool receivable in the chuck, includes a release sleeve (4) axially displaceable relative to the base body (6) against a spring-biasing force and including an inwardly located locking element (11) for formlockingly securing the chuck on a power tool spindle (15) with locking elements (12) extending through respective openings (13) formed in a base body (6) and engageable in associated recesses (14) of the power tool spindle (15), and a formlocking displacement guide (5) that provides for displacement of the release sleeve (4) relative to the base body (6) and includes, along its axial extension, a tangential section.

Abstract: An electrical hand-held saw includes a saw blade (14) projecting from an end side (6) of the saw housing (4) and reciprocating along a stroke direction (H) that substantially extends in a direction of a longitudinal extent of the housing (4) limited by the end side (6), and a suction device (16) securable on the housing (4) and having a bearing region (22) adjoining the end side (6) of the housing (4) and a suction opening (54) for removing material particles produced during operation of the saw.

Abstract: A device for measuring an angle and/or the torque acting on a rotatable body is proposed according to the invention, whereby the rotational angle is detected by means of magnetic or optical sensors. In particular, in a preferred exemplary embodiment, two devices (7, 8) are proposed, each of which comprises two optically readable code tracks. The two code tracks (1a, 1b or 2a, 2b) on one device (7 or 8) are similar in design and are offset in relation to each other, so that associated sensors (4) output a digital signal. The rotational angle is calculated based on the lag between the two digital signals. In a further embodiment it is provided that a torsion element (5) having a known torsional stiffness is situated between the two devices (7, 8). Torque transferred by the rotatable body (3) can also be calculated therefore from the angular difference of the two devices 7, 8. The device is used preferably in the steering axle of a motor vehicle.

Abstract: A battery (4) driven circular saw includes a housing (1a) with a motor (3) for driving the circular saw blade (2). The circular saw blade (2) is fixed to a drive shaft (7) that runs transverse to the plane (E) of the circular saw blade (2), the drive shaft being functionally connected by means of a linkage (15) to the motor (3). In order to achieve the most compact construction possible of the circular saw, the axis of rotation (R) of the motor (3) runs parallel to the plane (E) of the circular saw blade (2).

Abstract: A tensioning device with a tensioning lever (1) and a detachable tensioning nut (2) has a pivotal tensioning cam (6), mounted elastically in the tensioning lever (1). The tensioning lever (1) has a seat (3) with a noncircular inside surface (4) for receiving the tensioning nut (2), which is mounted axially displaceably therein. The tensioning nut has an outside surface shaped to correspond to the noncircular surface of the seat (3). The tensioning nut (2) can be fixed removably in the tensioning lever (1) by a recess, which is disposed in the tensioning nut and into which the tensioning cam (6) can be engaged.

Abstract: A braking device for an electrical tool and including an actuation member (1), a braking drum (4) secured on the shaft of the electrical tool for joint rotation therewith, and a braking member (5) secured on the actuation member for joint displacement therewith, the actuation member being linearly displaceable upon a biasing force of a return spring acting thereon for pressing the braking member against a circumferential surface of the braking drum for braking the shaft and thereby the working tool.

Abstract: A device for measuring an angle and/or the torque acting on a rotatable body is proposed according to the invention, whereby the rotational angle is detected by means of magnetic or optical sensors. In particular, in a preferred exemplary embodiment, two devices (7, 8) are proposed, each of which comprises two optically readable code tracks. The two code tracks (1a, 1b or 2a, 2b) on one device (7 or 8) are similar in design and are offset in relation to each other, so that associated sensors (4) output a digital signal. The rotational angle is calculated based on the lag between the two digital signals. In a further embodiment it is provided that a torsion element (5) having a known torsional stiffness is situated between the two devices (7, 8). Torque transferred by the rotatable body (3) can also be calculated therefore from the angular difference of the two devices 7, 8. The device is used preferably in the steering axle of a motor vehicle.

Abstract: A battery (4) driven circular saw includes a housing (1a) with a motor (3) for driving the circular saw blade (2). The circular saw blade (2) is fixed to a drive shaft (7) that runs transverse to the plane (E) of the circular saw blade (2), the drive shaft being functionally connected by means of a linkage (15) to the motor (3). In order to achieve the most compact construction possible of the circular saw, the axis of rotation (R) of the motor (3) runs parallel to the plane (E) of the circular saw blade (2).

Abstract: A braking device for an electrical tool and including an actuation member (1), a braking drum (4) secured on the shaft of the electrical tool for joint rotation therewith, and a braking member (5) secured on the actuation member for joint displacement therewith, the actuation member being linearly displaceable upon a biasing force of a return spring acting thereon for pressing the braking member against a circumferential surface of the braking drum for braking the shaft and thereby the working tool.