Abstract: A torque sensing unit for a power tool arranged to generate a torque responsive signal by sensing the reaction torque transferred from a ring gear of a planetary reduction gearing to the tool housing. The torque sensing unit includes an annular torque transferring element disposed perpendicularly to the geometric axis of the ring gear and being formed with a first pair of external engagement portions for connecting the torque transferring element to the housing, a second pair of external engagement portions for connecting the torque transferring element to the ring gear, and at least one pair of weak elastically deformable zones located between the engagement portions and provided with sensors for delivering signals in response to the transferred reaction torque.

Abstract: A power wrench includes a housing divided into two parts which are rotatable relative to each other: a first part including a handle and a transverse section lodging a rotation motor, and a second part including a reduction gearing, an output shaft and a rigidly attached and laterally extending reaction bar. A swivel connection is provided between the housing parts and includes an angle sensor arranged to generate signals in response to relative angular movements between the housing parts, and a power control unit communicates with the angle sensor and is arranged to at least substantially reduce the motor power as a pre-set maximum angular movement between the housing parts is exceeded as the motor is started.

Abstract: A pneumatic vane motor includes a stator with a cylinder, an inlet connectable to a pressure air source and an outlet connectable to an exhaust passage, a rotor journalled in the stator, and an output shaft. The stator has a front opening forming a clearance seal relative to the output shaft and an annular front cover with at least one elastic annular seal element encircling the output shaft at a distance from the clearance seal, wherein a low pressure chamber is formed between the clearance seal and the seal element or elements and communicates with the exhaust passage.

Abstract: A power tool having a rotation motor coupled to an output shaft (11) via a reduction gearing (13,14), wherein the reduction gearing (13,14) comprises at least one planetary gearing (14) with a sun gear (30), a ring gear (22), a planet wheel carrier (32) supporting two or more planet wheel units (35) each comprising two axially spaced spur gears (36,37) both secured to a spindle (38) which is rotatively journalled relative to the planet wheel carrier (32) via a bearing located between the spur gears (36,37).

Abstract: A portable pneumatic power wrench has a housing with a handle, a motor, a pressure air inlet passage, and an outlet passage for ducting exhaust air from the motor out of the housing. An outlet unit is connected to the outlet passage and has a first outlet opening section forming a main exhaust air flow path, a second outlet opening section forming an additional exhaust air flow path, and a manually operable valve arranged to control the additional exhaust air flow path by opening or closing the second outlet opening section. The total outlet flow area of the main exhaust air flow path and the additional exhaust air flow path gives an augmented torque output of the power wrench.

Abstract: A multi conductor flat type cable, which is intended for connecting a portable electric power tool to a stationary power supply and operation control unit, has a connector plug (18) attached to its one end, wherein the cable (10) has a twisted shape section (A) adjacent the connector plug (18) for facilitating universal bending of the cable (10). The twisted section (A) is provided with a transition sleeve (16) with a cylindrical portion (17) at the connector plug end and two tapering tongues (20, 21) extending along the cable (10) over at least a part of the twisted section (A), wherein the cable (10) is adapted to the cylindrical shape of the connector plug (18) and strengthened against too close bending in the twisted section (A). The transition sleeve (16) is molded onto the cable (10) in a first manufacturing step, and in a second step the cable (10) together with the transition sleeve (16) are heated to a certain temperature and twisted to assume the twisted shape in the section (A).

Abstract: An ultrasonic measurement device and method in which an ultrasonic transducer is acoustically coupled to an object to be measured by a resilient material contact layer. The transducer transmits a plurality of consecutive ultrasonic transmit signals into the object being measured, the transmit frequency of each of the plurality of transmit signals being distinct from the frequency of the other transmit signals of the plurality of transmit signals. Signal echoes of the transmitted signals are received, and based on the received signal echoes, at least one transmit frequency to be used for ultrasonic measurement of the object is selected.

Abstract: A portable power wrench of an angle type includes an elongated housing with an angle drive head and a rear handle and supports a motor. The power wrench also includes a manually operated power control device including a main power control trigger located at the rear handle and an auxiliary power control trigger located at the angle drive head. The motor as well as the main trigger and the auxiliary power control trigger are connected to a programmable control unit in which there are stored operation parameter sets suitable for a screw joint running down phase and a final tightening phase, respectively. The auxiliary power control trigger is arranged to activate the running down parameter set only, whereas the main power control trigger is arranged to activate the final tightening parameter set.

Abstract: An electric power tool having a housing, a motor, a jack for receiving a connection plug of an electric cable, and a swivel unit mounted on the housing and carrying the jack, wherein the swivel unit includes a first head mounted on the housing for rotation about a first axis, and a second head mounted on the first head for rotation about a second axis. The first and second axes form an angle between them, and provide for freedom of rotation of the jack, thereby providing for positioning of the jack and routing of a connected cable in desired directions relative to the housing.

Abstract: A method and a device are provided for locking the operation of a power wrench to the location of an unacceptably tightened screw joint or object with a sensor for at least one tightening parameter. A position sensing system is provided for indicating continuously the position of the power wrench during tightening operations, and a control unit includes a unit for comparing obtained tightening parameter values with predetermined limit values and to provide an OK or a NOK signal in response to those limit values being passed or not for each screw joint. A locking device is provided to lock the power wrench operation to the very position of the screw joint or the object for which a NOK signal has been issued until the unacceptably tightened screw joint has been attended to and the NOK signal is removed.

Abstract: A torque responsive release clutch intended for a power nutrunner and comprises a driving clutch half (11) and a driven clutch half (10) coupled to each other for torque transfer by means of axially directed teeth (16, 17), wherein one of the clutch halves is axially movable between an engagement position and a release position against the action of a bias spring (13). Each one of the teeth (16) of one of the clutch halves (10) has a substantially prismatic shape and extends axially from a base portion (19) to a top portion (20) and comprises two surfaces (22, 23) which form between them a ridge (25). The base portion (19) of the tooth (16) has a radial extent from an inner diameter (d1 to an outer diameter (d2), and the ridge (25) extends from the inner diameter (d1 at the base portion (19) to the outer diameter (d2) at the top portion (20).

Abstract: A power tool comprises a housing (10;110) with an output shaft (11;111) driven by a rotation motor and an angle drive (12;112) connecting the output shaft (11;111) to the motor, wherein the angle drive (12;112) comprises a drive spindle (15;115) connected to the motor and carrying a pinion (15;115), and a bevel gear (17;117) secured to the output shaft (11;111). The drive spindle (15;115) and the pinion (16:116) are supported in the housing (10;110) via a ball type thrust bearing (24;124) having in one of its embodiments an inner ring (31) with a thread for cooperation with a threaded portion (33) on the drive spindle (15), and an outer ring (26;126) which is rigidly secured in the housing (10). The inner ring (31) is adjustable and lockable relative to the drive spindle, (15) by an annular lock element (35).

Abstract: A number of pre-production calibration tightenings are performed at a screw joint identical to a screw joint used in production and using the same impulse wrench as to be used in production tightening. The value of one or more tightening related parameters are registered at the attainment of the desired pre-tension level, and those parameter values are used to statistically form a basis for a reference set-up. The tightening parameter values registered during production tightening are compared to the reference set-up, and an indication is obtained as to discrepancies between the reference set-up and the actually registered parameter values to get an indication as to whether the impulse wrench is malfunctioning and/or the screw joint is faulty.

Abstract: A pneumatic air tool includes a housing with a forward angle gearing arranged in a gearing chamber, a motor chamber, a rear air outlet section and a forward air outlet section. The motor chamber includes a pneumatic motor with air communication openings, which communicate with both the rear air outlet section, and the forward air outlet section. A part of the outlet air is ducted through the forward air outlet section including a circular groove in the housing which form part of a cooling chamber. The walls of the groove form together an enlarged heat transferring surface by which the heat generated in the angle gearing is efficiently transferred to the cold exhaust air from the motor passing through the cooling chamber. By communicating exhaust air through the cooling chamber there is obtained an efficient cooling of the angle gearing while maintaining favorable outer dimensions of the housing.

Abstract: A pneumatic impulse wrench for tightening screw joints includes a housing with a pressure air inlet passage, an exhaust air outlet passage, a rotation motor, a hydraulic impulse generator, and is connected to a stationary programmable control unit. The impulse wrench also includes a torque indicating mechanism connected to the control unit for feeding back electric signals responsive to the output torque of the wrench, an electromagnetically activated inlet valve arranged in the air inlet passage, and an electromagnetically activated exhaust valve which controls the exhaust air flow from the motor. The exhaust valve is a proportional valve activated by a linearly operated electromagnetic actuator and arranged to continuously adapt the exhaust air flow and, hence, the motor power to the characteristics of the actual screw joint being tightened in response to feed back signals from the torque indicating mechanism and in accordance with a programmed tightening strategy.

Abstract: An impact wrench includes a housing, a rotation motor, an output shaft, and an impact mechanism including an inertia drive member with an impact chamber, a drive socket coupling the drive member to the motor, and anvil formed integral with an output shaft and extending into the impact chamber, and a coupling member arranged to transfer kinetic energy from the drive member to the anvil, a lubricant provided in the impact chamber, and barrier forming cover element mounted on the drive member to seal off the impact chamber and prevent lubricant from being expelled from the impact chamber at rotation of the drive member.

Abstract: A portable power drill comprises a housing, a drilling implement carrying drive spindle, and two individually powered and controlled motors for rotating and axially feeding the drive spindle. The drive spindle is rotative and axially displaceable relative to the housing and connected to the drive and feed motors via angle gears including two bevel gears supported on the drive spindle. The feed via an axially locked but rotative nut piece and an external thread on the drive spindle, whereas the drive motor is drivingly connected to the drive spindle via longitudinal keyways on the drive spindle and mating splines in one of the bevel gears. The drive motor and the feed motor are electric motors controlled and monitored by a programmable control unit.

Abstract: A straight type power grinder includes an elongate housing having a handle with a power controller at its rear end, and a neck portion at its forward end supporting an output shaft connected to a rotation motor. The neck portion is formed with an integrated mounting flange for a grinding wheel guard. The neck portion and the mounting flange form an auxiliary handle for a comfortable manual support of the grinder during operation.

Abstract: A pneumatic vane motor with a stator cylinder having an air inlet opening and an air outlet opening, a rotor eccentrically journalled in the cylinder and carrying a number of sliding vanes which divide the cylinder into moving cells, wherein the cylinder comprises a by-pass passage located between the air inlet opening and the air outlet opening and arranged to leak air from a pressurized working cell into a preceding cell before the working cell reaches the outlet opening, thereby using a preceding cell as an expansion volume for sound attenuation.

Abstract: A connector plug is provided for a multi-conductor cable with an axial load transferring non-conducting tensile string. The connector plug includes a casing carrying a number of contact elements attached to conductors of the cable for engaging corresponding contact elements connected to a matching jack, and the tensile string is anchored relative to the casing via an annular element mounted at the end of the cable. A transverse pin is firmly attached to the tensile string of the cable and positively engages the annular element. The annular element has a rim portion with a bigger outer diameter than an outer cross sectional dimension of the cable so as to engage an internal shoulder on the casing and enable transfer of axial load from the tensile string of the cable to the casing and further to a connected matching jack via the transverse pin and the annular element.