Abstract: A power tool 1 including a bit socket 6 which is configured to hold a chiseling bit 7 so that the latter can move along an axis of movement 3. A magneto-pneumatic striking mechanism 2 includes a primary drive 22 that is arranged around the axis of movement 3 and that has a first magnet coil 46, a permanently and radially magnetizable ring magnet 42 and a second magnet coil 47 arranged consecutively in the striking direction 5. On the axis of movement 3, inside the magnet coils 46, 47, the striking mechanism 2 has a striker 4 and a striking block 13 arranged consecutively in the striking direction 5. An air cushion 23 acts upon the striker 4 in the striking direction 5.

Abstract: A machine tool with a tool holder equipped to mount a chiseling tool moveably along a movement axis. A magnetic-pneumatic striking mechanism contains a primary drive arranged around the movement axis. The primary drive includes a first magnetic coil and a second magnetic coil in sequence in the impact direction. The striking mechanism has, in sequence, a striker and an anvil arranged within the magnetic coils on the movement axis in the impact direction. In addition, the striking mechanism has an air spring affecting the striker in the impact direction. A controller is configured to activate the primary drive during an active retraction phase to accelerate the striker opposite the impact direction until a kinetic energy of the striker is sufficient to achieve a selected compression of the air spring as a function of the impact energy of the striker.

Abstract: A machine tool is disclosed. A magneto-pneumatic striking mechanism has a primary actuator arranged around an axis of movement and includes a first magnetic coil and a second magnetic coil. The striking mechanism has, on the axis of movement within the magnetic coils, a striker and a die. Furthermore, the striking mechanism has an air spring acting on the striker in a direction of impact. The air spring may be entirely or partially within the first magnetic coil. The air spring has a ventilation opening that is open to the environment if the striker is less than 10% of its stroke away from the die, and otherwise the ventilation opening is closed. An exchange of air with the environment is therefore only possible when the striker is near the die or is near the impact position.

Abstract: A machine tool with a tool holder which is equipped to mount a tool, such as a chiseling tool, moveably along a movement axis. A striking mechanism, such as a magnetic-pneumatic striking mechanism, contains a primary drive which is arranged around the movement axis and has in sequence in the impact direction a first magnetic coil, a permanent and radially magnetized annular magnet, and a second magnetic coil. The striking mechanism has a striker and an anvil arranged within the magnetic coils on the movement axis in sequence in the impact direction. In addition, the striking mechanism may have an air spring affecting the striker in the impact direction. The associated inventive control method provides that, during a movement of the striker opposite the impact direction, a measurement is measured for a voltage induced by the first magnetic coil. The controller starts an acceleration phase according to a change in the polarity of the induced voltage.

Abstract: A hand-held power tool is disclosed. The power tool has a linear motor with a rotor, an exciter piston that is coupled mechanically to the rotor, and a bearing device with a rotor mounting to support the longitudinal movement of the rotor and an exciter piston mounting to support the exciter piston. The rotor mounting and the exciter piston mounting form a three-point mounting, which is the sole bearing for the rotor and the exciter piston.

Abstract: A control method for a power tool and a power tool is disclosed. The control method has an operating mode and a safety mode. In the operating mode, a motor drives a tool receptacle in a rotating manner. In the operating mode, the motor has a power consumption in the amount of at least an operating value. The safety mode is triggered if a sensor device detects a rotational blockade of the tool receptacle. In the safety mode, a clutch that is switchable by electrical signals located in the drive train between the motor and tool receptacle is periodically opened and closed and a power consumption of the motor is reduced as compared to the operating value.

Abstract: A hand-held power tool (1) includes a linear motor (2) having a rotor (3) which is movable along a percussion axis (A) in an axially limited manner between two reversal points (W) and which can be driven by the striking piston (5) of the power tool with the intermediary of an air spring (4), sensors designed for determining the actual state of the rotor (3) and connected to a computer (9) connected via power electronics (33) to at least one field coil (10) of the linear motor (2), with the rotor (3) being displaced against a contact element (11a, 11b) at least at one reversal point (W) and being pressed against the contact element electromagnetically; and a control process for the hand-held power tool.

Abstract: A hand-held power tool (1) includes a linear motor (2) having a rotor (3) which is movable along a percussion axis (A) in an axially limited manner between two reversal points (W) and which can be driven by the striking piston (5) of the power tool with the intermediary of an air spring (4), sensors designed for determining the actual state of the rotor (3) and connected to a computer (9) connected via power electronics (33) to at least one field coil (10) of the linear motor (2), with the rotor (3) being displaced against a contact element (11a, 11b) at least at one reversal point (W) and being pressed against the contact element electromagnetically; and a control process for the hand-held power tool.

Abstract: A surface coordinate measuring device (1) includes a computing unit (8) arranged in a handheld housing (9), a positioning device (2) for positioning the coordinate measuring device at a surface point (P) on a wall surface (3), a display device (6) for displaying a measurement calculated by the computing unit (8), an electronic distance measuring system (7) for determining a longitudinal distance along a longitudinal measurement direction, and a transverse measuring device for additional determination of a transverse distance along a transverse measurement direction oriented transverse to the longitudinal measurement direction, with the computing unit (8) having a program-controlled algorithm for carrying out the necessary measurements and calculations.

Abstract: A method of controlling a single-phase linear motor (1) for driving a striking mechanism (2) with a loose coupling (4) between a runner (5) of the linear motor (1) and a striker (6) of the striking mechanism (2) has, within a striking period in which exactly one force impact (K) of the striker (6) is carried out on a tool (8) or an anvil (7), a pull phase (Z) in which the loose coupling (4) contacts a runner-side contact surface (KL) with a one-sided constrained contact and a push phase (D) in which the loose coupling (4) contacts a striker-side contact surface (KS) with a one-sided constrained contact, and a change phase (W) provided between the pull phase (Z) and the push phase (D) in which the one-sided constrained contact changes between the two contact surfaces (KL-KS) along a contactless reciprocating gap (S) in that the runner (5) releases the one-sided constrained contact with one contact surface (KL/KS) in a regulated manner and produces the one-sided constrained contact with the other contact surfac

Abstract: A surface coordinate measuring device (1) includes a computing unit (8) arranged in a handheld housing (9), a positioning device (2) for positioning the coordinate measuring device at a surface point (P) on a wall surface (3), a display device (6) for displaying a measurement calculated by the computing unit (8), an electronic distance measuring system (7) for determining a longitudinal distance along a longitudinal measurement direction, and a transverse measuring device for additional determination of a transverse distance along a transverse measurement direction oriented transverse to the longitudinal measurement direction, with the computing unit (8) having a program-controlled algorithm for carrying out the necessary measurements and calculations.

Abstract: An inductive sensor arrangement for detecting ferromagnetic or non-ferrous electrically conducting objects hidden in a surrounding medium comprising three field coils arranged in essentially the same geometric plane and adjacently positioned at angular distances of usually 120° from each other around a central axis orthogonal to the plane for generating an alternating magnetic flux by a sequential excitation with an AC-current ramp. The sensor arrangement further comprises three sense coils respectively mounted inside each associated field coil and in an orientation to the axes of each of the field coils such that essentially no voltage is induced in the sensor coils in an environment free of a metallic object.

Abstract: A pneumatic percussive mechanism having an axially reciprocating percussive loaded percussion piston (2), wherein a non-contacting magnetic field sensitive sensor (3) is arranged radial thereto. The percussion piston (2) features at least externally ferromagnetic material and has a plurality of axially separated zones (4) of different magnetic permeability.

Abstract: An explosive powder charge-operated setting tool having a drive piston (4) for driving a pin-shaped nail (5) in a constructional component in a single drive-in step, and a control circuit (I) for controlling a setting depth (T) and including control electronics (7), a set point generator (8) for setting the setting depth (T), a position-determining sensor (9) for determining a position of a lower dead point (uTP) of movement of the drive piston (4), and a regulator (10) for an automatic adjustment of a motion energy of the drive piston; and a method of controlling the setting depth (T).

Abstract: A pneumatic percussive mechanism having an axially reciprocating percussive loaded percussion piston (2), wherein a non-contacting magnetic field sensitive sensor (3) is arranged radial thereto. The percussion piston (2) features at least externally ferromagnetic material and has a plurality of axially separated zones (4) of different magnetic permeability.

Abstract: An inductive sensor arrangement for detecting ferromagnetic or non-ferrous electrically conducting objects hidden in a surrounding medium comprising three field coils arranged in essentially the same geometric plane and adjacently positioned at angular distances of usually 120° from each other around a central axis orthogonal to the plane for generating an alternating magnetic flux by a sequential excitation with an AC-current ramp. The sensor arrangement further comprises three sense coils respectively mounted inside each associated field coil and in an orientation to the axes of each of the field coils such that essentially no voltage is induced in the sensor coils in an environment free of a metallic object.

Abstract: The inductive sensor arrangement for detecting metal objects hidden in a surrounding medium comprises a pair of field coils for generating an alternating magnetic flux by a sequential excitation with an AC-current and a pair of sense coils respectively mounted inside each associated field coil in an orientation to the axes of each of said field coils such that essentially no voltage is induced in said sensor coils in an environment free of a metallic object. If a metallic object comes into the vicinity of the inductive sensor four characteristic voltage value sets are produced by the sense coil pair which become subject of an algorithmic processing for defining a position and distinction criterion in respect to said hidden metallic object. The sensor arrangement has the advantage of a single point measurement resulting in an accurate position discrimination for a hidden metallic object like a rebar in concrete.

Abstract: An explosive powder charge-operated setting tool having a drive piston (4) for driving a pin-shaped nail (5) in a constructional component in a single drive-in step, and a control circuit (I) for controlling a setting depth (T) and including control electronics (7), a set point generator (8) for setting the setting depth (T), a position-determining sensor (9) for determining a position of a lower dead point (uTP) of movement of the drive piston (4), and a regulator (10) for an automatic adjustment of a motion energy of the drive piston; and a method of controlling the setting depth (T).