Abstract: A power tool for tightening a fastener includes: an angle measurement unit for measuring a rotational angle (?) of the fastener; a torque measurement unit for measuring a torque (T) delivered to the fastener during tightening; a motor connected to rotatable parts of the power tool for driving the tightening of the fastener; a processor for calculating a tightening energy (Et) needed to complete tightening of the fastener from ? to a predetermined target angle (?t), wherein Et is calculated based on ?, ?t and a stiffness (k) of a joint; and a regulator to regulate a rotational speed (?) of the motor to provide rotational energy (Er) in the form of rotational inertia in the rotatable parts of the power tool to meet the needed Et, wherein the power tool interrupts the tightening of the fastener at ?t, ?t defined from snug, at a snug angle (?0).

Abstract: A method for detecting deviations between an actual angular displacement in a screw joint being tightened by an impulse type power wrench and an angular displacement measured between a power wrench housing and an impulse unit of the power wrench, includes determining a first angular interval (??1) between an end point (AE) of a first delivered impulse (A) and an end point (BE) of a succeeding second delivered impulse (B), determining a second angular interval (??2) between a start point (Bs) of the second delivered impulse (B) and a start point (CS) of a succeeding third delivered impulse (C), comparing (??1) with (??2) to determine a difference between the intervals, and determining that a deviation exists between the actual angular displacement in the screw joint and the angular displacement measured between the power wrench housing and the impulse unit based on the determined difference between the intervals (??1 and ??2).

Abstract: An angle type power wrench includes a housing, a motor, an output shaft and an angle drive connecting the motor to the output shaft. The angle drive includes a drive pinion provided with a forward gear head, and a bevel gear provided on the output shaft and engaged by the drive pinion gear head. The drive pinion is surrounded by a bearing support sleeve supporting a forward drive pinion bearing and a rear drive pinion bearing axially spaced from the forward drive pinion bearing. The forward drive pinion bearing includes an inner ball race at a forward end of the drive pinion at or very close to the gear head, and an outer ball race at a forward end of the bearing support sleeve wherein the bearing support sleeve is connected to the housing via an adjustment connection adapted to enabling adjustment of an axial position of the drive pinion.

Abstract: A pneumatic power tool includes: a housing with a pressure air inlet passage, a rotation motor, a working implement carrying output shaft, and an over-speed safety device including: a valve element located in the inlet passage and shiftable between open and closed positions, a motor speed responsive actuating mechanism which can shift the valve element from an open to a closed position as motor speed reaches an accepted maximum limit, and a retaining unit which maintains the valve element in an open position at normal motor speed levels and releases it toward the closed position when actuated by the actuating mechanism. The retaining unit includes: a latch spindle having varying width in an axial direction and coupled to the actuating mechanism for displacement between valve element locking and releasing positions at the maximum speed limit, and a support surface and axially adjacently located one or more waist portions.

Abstract: An Impulse wrench includes: a housing, a motor with a stator and a rotor, an impulse unit including an output shaft, a power control unit connected to the motor, and a trigger supported on the housing and connected to the power control unit and arranged to selectively deliver signals to activate the power control unit, wherein the impulse unit including the output shaft is axially displaceable in relation to the housing. The trigger includes a sensor arranged to be activated and deliver signals in response to axial displacements of the impulse unit including the output shaft relative to the housing, and the power control unit is arranged to control the motor operation in response to signals received from said sensor.

Abstract: A power tool, which includes or is connectable to a computerized unit including a user interface, includes: a portable tool body supporting a motion sensor unit; and an activation unit by which the power tool may be set in two different modes, one production mode and one user interaction mode in which the power tool is configured to provide data from the motion sensor unit to interact with the user interface, such that a movement of the tool body is translated into an input to the user interface.

Abstract: A vacuum adapter for a power tool, with a bit holder extending from a front end of the power tool, is arranged to house the bit holder and to suck screws into alignment with a bit arranged inside the bit holder. The vacuum adapter includes: a connection part for connecting the vacuum adapter to the front end of the power tool such that the vacuum adapter covers the bit holder; a vacuum connection for connecting the vacuum adapter to a negative pressure source; a quick coupling for rapid disconnection of at least a part of the vacuum adapter in order to access the bit holder for exchanging bits; and a cover part arranged to cover the bit holder and that is connected to the connection part via a quick coupling and that may be separately disconnected from the power tool, leaving the connection part attached to the power tool.

Abstract: A hand held power tool, for delivering a torque to a joint, includes a housing that houses a motor arranged to drive an input shaft; an output shaft arranged to provide a torque to the joint; and a planetary gear connecting the input shaft to the output shaft. A flywheel is arranged to rotate freely with respect to the housing. A cam block, loosely fitted inside the housing, is rotatively connected to a part of the planetary gear and connected to the housing via a cam profile, wherein an interaction between the cam block and the cam profile will force the cam block into contact with the flywheel when the cam block is rotated. Thus, any counterforces acting on the output shaft will be provided to the flywheel via the planetary gear, such that the operator will not need to provide any counterforces.

Abstract: An electric hand held pulse tool for performing tightening operations where torque is delivered in pulses to tighten screw joints. The pulse tool includes a bidirectional electric motor, an output shaft, a sensor for monitoring a parameter reflecting a delivered torque pulse, and a control unit for controlling the electric motor. The sensor provides information regarding the monitored parameter to the control unit. The control unit, during a tightening operation performed by the pulse tool in a first direction, controls the motor to provide at least one torque pulse on the output shaft in a second direction that is opposite to the first direction. The sensor monitors a parameter reflecting a delivered torque pulse on the output shaft in the second direction. The control unit also determines information about the nature and state of a joint, due to the torque pulse on the output shaft in the second direction.

Abstract: An electric power tool includes an electric motor with a motor gear, an output shaft with an input gear, a coupling that connects the motor gear to the input gear, and a housing that houses the motor, the motor gear, the coupling and the input gear. The coupling includes a shaft portion and two connective portions arranged at opposite ends of the shaft portion for connection to the motor gear and input gear, respectively. The motor gear and the input gear, each, have a cambered profile allowing a tilting movement of the coupling with respect to an axial position of one of the motor gear and the input gear that has a cambered profile.

Abstract: An electric power tool includes an electric motor, an output shaft, a housing that houses the electric motor and at least part of the output shaft, and a reduction gear drivingly arranged between the electric motor and the output shaft. The reduction gear includes a load sensitive part that is rotatable in response to reaction forces created during operation of the power tool. A torsion spring, arranged to counteract any such rotation, includes a first end and a second end, the first end including a first connective interface that is rotationally lockable to a connective interface of the load sensitive part, and the second end including a second connective interface that is rotationally lockable with respect to at least one of the housing and the motor. At least one of the first and the second connective interfaces includes an element for prohibiting axial movement between the connected parts.

Abstract: A spindle of a drilling tool includes a socket portion having a first axial length (a1) of a first diameter (d1) for receiving and attaching a drill bit to the spindle. The spindle includes a fluid conduit having a second diameter (d2) narrower than (d1) for conveying a fluid to the socket portion. An interface space with diameter (d1) is formed between the fluid conduit and the drill bit when the drill bit is installed in the socket portion. A fluid conveyor, having a third diameter (d3) narrower than (d1), connects the fluid conduit to the drill bit to avoid fluid gathering in a periphery of the interface space. The fluid conveyor includes a first O-ring abutting a mouth of the fluid conduit, a second O-ring abutting a mouth of a fluid channel of the drill bit, and a spring between the first and second O-rings.