Abstract: Braking device inserted in a test bench (2) for checking the correct operation of industrial screwdrivers, wherein the braking simulates a tightening operation of such screwdriver, comprising a container body (1) on the top of which a coupling (11) protrudes, suitable for coupling with the head (3) of the screwdriver to be tested, said coupling (11) being connected, by means of a shaft (12), to a braking unit (13), an electronic torque and angle detector (14) of the shaft rotation (12). Such braking unit (13) comprises a plate (14), rotated by the screwdriver, which is braked by suitable friction surfaces (15) moved towards the plate by the movement of an actuator; the movement of such actuator is performed by means of at least one electronically controlled piezoelectric element (17).

Abstract: A power tool is arranged to operate in at least a first operating mode and a second operating mode. The power tool is operative to provide a first type of light signal from a light emitting device arranged to light up an object to be processed when the power tool is set in the first operating mode and to provide a second type of light signal when the power tool is set in the second operating mode.

Abstract: A power tool attachment part for a power tool includes an elongated housing including an upper housing part and a lower housing part interconnected with the upper housing part. An input gear wheel for connection to an output shaft of the power tool is arranged at a first end of the housing. An output gear wheel with an output connection is arranged at a second end of the housing. At least one intermediate gear wheel is arranged inside the housing to transmit rotation of the input gear wheel to the output gear wheel. A magnet is arranged in the elongated housing, wherein the magnet is arranged to collect ferromagnetic particles.

Abstract: A method for an electric power tool includes providing a main current pulse (A) in a first direction driving a rotating shaft in a first direction to add torque to a joint; after providing the main current pulse (A), providing a current pulse (C) in an opposite direction to the first direction; immediately prior to providing the current pulse (C) in the opposite direction, providing a first pre-pulse current pulse (B) that is in the same direction as the current pulse (C) in the opposite direction and of a magnitude lower than the current pulse (C) in the opposite direction; and immediately prior to providing the main current pulse (A), providing a second pre-pulse current pulse (D) that is in the same direction as the main current pulse (A) and of a magnitude lower than the main current pulse.

Abstract: An attachment part for a power tool includes an elongated housing including an upper housing part, a lower housing part and an interconnection structure that interconnects the upper and lower housing parts. An input gear for connection to an output shaft of a power tool is arranged at a first end of the housing. An output gear with an output interface is arranged at a second end of the housing. The interconnecting structure includes a sleeve member extending through a first central bore at the first end of the upper housing part, which sleeve member receives the input gear, and a fixation member extending through a second central bore at the first end of the lower housing part and which is arranged to be secured to the sleeve member to clamp the upper and lower housing parts. A tool assembly includes a power tool and the attachment part.

Abstract: A power screwdriver includes a housing having a vacuum chamber arranged to communicate with a source of sub-atmospheric pressure. The power screwdriver includes a motor, a bit drive spindle, and a bit supporting sleeve connected to the bit drive spindle. The rear end part of the bit supporting sleeve is surrounded by the vacuum chamber. The bit supporting sleeve is journaled by a bearing between a forward end part and a rear end part of the bit supporting sleeve. The bit supporting sleeve includes at least one longitude vacuum passage extending from its rear end part to its forward end part.

Abstract: A repositionable power wrench includes a housing, a motor arranged inside the housing, and an output shaft, which is rotationally connected to the motor and telescopically arranged with respect to the housing to allow axial movement of the output shaft with respect to the housing between a fully extended position (Emax) and a fully compressed position, with a resilient member being arranged to urge the output shaft towards the fully extended position (Emax). The power wrench also includes or is connectable to a positioning system arranged to monitor a position of the power wrench. The output shaft includes an output end arranged to interact with a fastener. A sensor is arranged to monitor a level of extension (E) of the output shaft with respect to the housing, such that the position of the output end of the output shaft may be determined.

Abstract: A handheld power tool includes an actuator arrangement, which includes a movable trigger member and a sensor arrangement. The trigger member includes at least one magnetic element, and the sensor arrangement is responsive to a displacement of the magnetic element along with the movable trigger member relative to the sensor arrangement. The sensor arrangement includes an analog magnetic field sensor configured to provide a signal proportional to the position of the magnet, a first digital magnetic field sensor configured to provide a first digital switching point in response to the position of the magnet, and a second digital magnetic field sensor configured to provide a second digital switching point in response to the position of the magnet.

Abstract: An impulse wrench includes a housing, an electric motor with a rotor, a hydraulic pulse unit with an inertia drive member and an output shaft, and a coupling rigidly connecting the rotor to the inertia drive member to form an integrated rotating structure. The coupling includes a male coupling portion on the inertia drive member and a female coupling portion on the rotor, such that the male coupling portion is received in the female coupling portion to form the coupling. The male and female coupling portions have external and internal threaded sections, respectively, where an axial clamping force is accomplished at relative rotation of the rotor and the inertia drive member. The male coupling portion and the female coupling portion are provided with mating conical surfaces which are brought together by the axial clamping force to form a rigid connection between the rotor and the inertia drive member.

Abstract: A power wrench includes a cylindrical housing, an electric motor, an output shaft connected to the motor and a power switching device activated by a trigger located on the housing. The trigger is supported on an annular sleeve element coaxially disposed and rotatable relative to the housing for enabling adjustment of the angular position of the trigger relative to the housing. Irrespective of its angular position the trigger is arranged to axially displace a non-rotatable activation ring to of activate the power switching device. The housing includes an adjustable angle head supporting the output shaft and arranged to be set in alternative angular positions relative to the housing.

Abstract: A handheld electric power tool includes a drive train assembly arranged along a longitudinal axis of the tool, a housing adapted to receive the drive train assembly, and a retaining ring. The housing includes a first portion and a second portion adapted to form the housing, which has a conical outer surface portion having a substantially circular cross section. The retaining ring includes an inner surface having a conical inner surface portion adapted to cooperate with the conical outer surface portion such that a force is exerted on the first and second housing portions via the retaining ring as the conical inner surface and the conical outer surface are axially displaced with respect to one another, thereby urging the first and second housing portion together.

Abstract: A power screw driver includes a housing with a vacuum chamber communicating with a source of sub-atmospheric pressure, a motor, a drive spindle, a screw engaging bit connected to the drive spindle, a suction nozzle surrounding and being rigidly secured to the bit, and a bit supporting sleeve having a forward end part and a rear end part. The rear end part of the bit supporting sleeve is connected to the drive spindle and extends into the vacuum chamber. The forward end part of the bit supporting sleeve in contact with the suction nozzle. At least one longitudinal internal passage extends through the bit supporting sleeve and is arranged to communicate sub-atmospheric pressure from the vacuum chamber to the suction nozzle.

Abstract: A method and a device for detecting the oil level in a hydraulic pulse unit at an impulse type power wrench, wherein the pulse unit comprises an oil filled pulse chamber, a motor driven inertia drive member, and a kinetic energy receiving member connected to an output shaft and intermittently coupled to the inertia drive member via an oil cushion to receive kinetic energy from the inertia drive member during repeated energy transfer phases. The rotation speed of the inertia drive member is measured both at the start of a pulse generating phase and at the end of that phase, wherein the two measured speeds are compared to each other, and when the speed at the end of the pulse generating phase exceeds the speed at the end of that phase by a certain percentage a faulty signal is emitted indicating a too low oil level in the pulse unit.

Abstract: An electric pulse tool includes an electric motor drivingly connected to a flywheel, an output shaft drivingly connected to a drive element, and a compression spring. The electric pulse tool is operative to oscillate the flywheel between a first and a second direction. The flywheel is configured to drive the drive element in the first direction to provide a torque pulse on the output shaft in the first direction, whereby the drive element compress the compression spring. The drive element is configured to drive the flywheel in the second direction, when the compression spring is decompressed and forces the drive element to rotate in the second direction.

Abstract: A power wrench includes a cylindrical housing, a motor, and an angle head attached to the housing and supporting an output shaft in a laterally extending position. The angle head is connected to the housing via a swivel coupling to enable rotation of the angle head and adjustment of the angular position of the output shaft relative to the housing. A releasable locking device is included between the angle head and the housing for arresting the angle head in alternative angular positions relative to the housing.

Abstract: A constant-velocity joint assembly for a power tool includes an output shaft and a coupling structure configured to drive the output shaft. The output shaft and the coupling structure form a joint configured to enable angling of the output shaft relative to the coupling structure at constant rotational speed, and the coupling structure is provided with a torque transducer configured to detect a torque acting on the coupling structure provided by the output shaft.

Abstract: An electric power tool for tightening screw joints includes a housing that encloses an electric motor, an angle gear, a back torque transducer, and a front torque transducer. The angle gear includes an input bevel gear drivingly connected to the electric motor and an output bevel gear drivingly connected to an output shaft of the electric power tool. The back torque transducer is arranged to measure a back torque reaction value before the input bevel gear. And the front torque transducer is arranged to measure a front torque reaction value after the output bevel gear.