Abstract: A stator for an electric machine comprises a tubular unslotted ferromagnetic flux collector ring (16) and stator winding coils (18, 19, 20) having two legs which extend substantially axially along the inner cylindrical surface of the flux collector ring (16). Each winding coil leg is confined within an envelope (22) of a thin, flexible, non-conductive non-magnetizable material which is impregnated with and bonded to the next legs as well as to the flux collector ring (16) by a hot-setting resinous material.

Abstract: A hydraulic torque impulse mechanism comprising a rotatively driven drive member (10) which has a concentric fluid chamber (12) as well as radially acting cams (25, 26, 28), an output shaft (16) which extends into the fluid chamber (12) and which has two radially extending cylinder bores (18, 19) communicating with each other via a central high pressure chamber (23), two oppositely disposed piston elements (20, 21) reciprocable in the cylinder bores (18, 19) by the cams (25, 26, 28), and two valve chambers (45, 46) each comprising a number of fluid communicating openings (50) interconnecting the high pressure chamber (23) and the drive member fluid chamber (12), and a pressure responsive leaf spring valve element(51) for blocking fluid communication through these openings (50) as the pressure difference between the high pressure chamber (23) and the fluid chamber (12) exceeds a certain level.

Abstract: A reversible power wrench includes a housing (10), a rotation motor, and a power transmission coupling the motor to an output shaft (21), and further includes a reduction gearing (20) with first planetary gearing (28) for transferring torque in the "forward" direction of rotation and a second planetary gearing (29) for transferring torque in the "reverse" direction of rotation. The first and second planetary gearings (28, 29) have rotationally interconnected sun gears (31, 39) and a common planet wheel carrier (34).

Abstract: A mounting apparatus for securing alternative grinding wheels to a threaded portion of an output shaft of a portable rotary grinding machine, the mounting apparatus comprising a threaded clamping device which cooperates with the threaded portion of the output shaft; a support hub which rigidly mounts on the output shaft, the support hub having an inner annular contact surface and an outer annular contact surface for backing grinding wheels mounted on the output shaft. The inner and outer annular contact surfaces are disposed concentrically relative to each other as well as relative to the output shaft, and the inner and outer annular contact surfaces are disposed at different axial levels such that the outer annular contact surface protrudes in front of the inner annular contact surface.

Abstract: A hydraulic torque impulse mechanism intended for a torque delivering tool and including a rotatively driven drive member (10) provided with a concentric fluid chamber (12) and radially acting cam elements (25, 26, 28), an output shaft (16) extending through the drive member (10) fluid chamber (12) and having two radial cylinder bores (18, 19) which communicate continuously with a central high pressure chamber (23) and support two piston elements (20, 21) which are reciprocable in the cylinder bores (18, 19) by the cam elements (25, 26, 28), whereby the output shaft (16) comprises two moderating chambers (45, 46) which communicate continuously with the high pressure chamber (23) and comprise a pressure responsive yielding system in the form of membranes (50) which are supported by end closures (47) of the moderating chambers (45, 46) and which are elastically deformable by the pressure difference between the high pressure chamber (23) and the fluid chamber (12) as this pressure difference is below a certain l

Abstract: An angle type power nutrunner having a housing (10) with a rotation motor, an angle head (15) with an output shaft (13), and a thread connection (21) including a lock nut (22) for securing the angle head (15) to the housing (10). The housing (10) is provided with a first group of radial holes (25) disposed in a circumferentially directed row and the angle head (15) is provided with a second group of radial holes (26) disposed in a circumferentially directed row, and a key pin is arranged to positively define alternative angular positions between the angle head (15) and the housing (10) by engaging selectively one hole each of the first and second groups of holes. The pitch of the first group of holes (25) is different than the pitch of the second group of holes (26) for enabling a small angle adjustment of the angle head (15) in relation to the housing (10).

Abstract: An oil seal for sealing off a fast rotating shaft (10) relative to a housing (11) comprises a first seal element (15) mounted on the shaft (10), a second seal element (18) resiliently mounted in the housing (11), both seal elements (15, 18) having cooperating contact surfaces (25, 26), and a spring (22) acting on the second seal element (18) to provide an axial contact pressure between the contact surfaces (25, 26). The contact surfaces (25, 26) of the seal elements (15, 18) are made of materials of different hardness, and the one consisting of the hardest material is formed with one or more circular ribs (27a-c) disposed concentrically with the shaft (10) and intended to cut mating circular grooves in the other seal element contact surface (25) during a running-in period.

Abstract: A torque responsive release clutch mechanism for a pneumatic power nutrunner having a housing (16) with an air inlet passage (11) and an air motor (12). The clutch mechanism includes a driving clutch half (22) with pockets (33) for two or more torque transferring balls (24), a bias spring (38), and an axially displaceable thrust element (34) for transferring the bias spring load to the balls (24), and a driven clutch half (23) having cam surfaces (25) for cooperation with the balls (24), wherein the driving clutch half (22) includes means (36, 44, 45) for feeding pressure air to the cylinder chamber (30), and the thrust element (34) has a cylindrical skirt portion (43) for sealing guidance in the cylinder chamber (30). A valve (44, 45, 48, 49) is arranged to accomplish a bias spring (38) compressing air force on the thrust element (34) as the latter has been initially displaced a certain distance by the balls (24) at release of the clutch.

Abstract: A cabinet for housing electronic equipment connectable to machines or power tools for performing operations, wherein connections are made with cables provided with single or multi contact connector plugs (19) received by single or multi contact jacks (17). The cabinet comprises a central casing (10), a door (13) and a partition wall (15) defining a connector chamber (16) inside the central casing (10) behind the door (13) and housing the jacks (17), such that the connector plugs (19) and jacks (17) are protected from environmental influence such as dust and/or splashing water or other fluids. The cables (18) extend into the casing (10) through openings (20) at the lower edge of the door (13). A lock (31, 32) on the door (13) enables protection against intentional as well as unintentional disconnection of the cables (18).

Abstract: A pneumatic power nutrunner comprises a housing (10), a rotation motor (19), an air inlet passage (15), a torque limiting release clutch (20) located between the motor (19) and an output shaft (13), which clutch (20) includes overriding cam elements (24, 25) spring biassed via a thrust sleeve (26), and a shut-off valve (30) in the air inlet passage (15) axially supported by an activating rod (32, 36) which by its forward end engages a latch (40) radially displaceable into a recess (42) in the thrust sleeve (26) for releasing the activating rod (32, 36) and the shut-off valve (30) for axial displacement at clutch release. The shut-off valve (30) comprises a pneumatic actuator (31, 34) for accomplishing an extension of the axial displacement of the activating rod (32, 36) at part closure of the shut-off valve (30).

Abstract: A method and a device for tightening threaded joints to a desired pretension level using a manually operated power nutrunner and controlling the tightening process by determining, during a tensioning phase, the instantaneous growth per time unit of the torque resistance from the joint, and adapting continuously the rotation speed of the nutrunner in relation to the determined instantaneous torque growth per time unit so as to obtain the same reaction force characteristics in the nutrunner handle for all joints, regardless of differences in torque resistance growth per angle of rotation between the joints.

Abstract: An impulse wrench comprises a pneumatic rotation motor (12), a hydraulic torque impulse generator (13) provided with an impulse magnitude responsive actuator (17), a linear movement responsive electric signal producing device (25) located at the rear end of the motor (12), a movement transferring push rod (21) extending through an axial bore (22) in the motor rotor (16) and interconnecting the actuator (17) and the signal producing device (25), an electrically activated motive air shut-off valve (31) disposed concentrically with the signal producing device (25), and an external process controlling and monitoring unit (40) connected to the signal producing device (25) and the shut-off valve (31) and arranged to compute and compare received signals with predetermined values and to initiate shut-off of the power supply (31) as a desired tightening condition is reached.

Abstract: An electric synchronous motor having a stator (10) with electric windings (14) and a rotor (16) which comprises a spindle (20) and a magnetic core (22), wherein the core (22) is formed by a number of annular magnetic discs (21) piled on the spindle (20) and having a length-to-diameter ratio exceeding 3. The discs (21) are insulated electrically from each other by layers of an inorganic material (17), such as an aluminum foil layer which is oxidized on both sides, and are axially clamped between shoulders (23, 24) on the spindle (20) to a high prestress level for obtaining a high bending strength, i.e. a higher coefficient of elasticity, of the rotor (16) as a whole.

Abstract: A hydraulic torque impulse generator includes a motor driven drive member (10) with a fluid chamber (23), an output spindle (11) extending into the fluid chamber, two diametrically opposite seal elements (12, 13) movably supported in axial slots (32, 33) in the output spindle for sealing cooperation with seal lands (24, 25) on the fluid chamber wall, axially extending seal ribs (27-30) on both the fluid chamber wall and the output spindle, and a cam spindle (40) coupled to the drive member (10) and extending into a coaxial bore (34) in the output spindle for moving the seal elements outwardly towards the fluid chamber wall in two relative angular positions between the drive member and the output spindle. The cam spindle (40) has two diametrically opposite and differently shaped cams (41, 42) for alternative engagement with high and low lift cam followers (45-50) on the seal elements (12, 13).

Abstract: A pneumatic rotation grinder comprises a housing (10) with a throttle valve controlled air inlet passage, a rotation motor drivingly connected to an output shaft (12) intended to carry a grinding tool, a safety guard (17) adjustably supported on the housing (10) in a coaxial disposition relative to the output shaft (12), and a lock device (26-28, 33-38) for arresting the safety guard (17) in desired angular positions relative to the housing (10). The lock device (26-28, 33-38) comprises both a latch (26-28) for positive coupling by engagement of teeth (26, 28) of the safety guard (17) relative to the housing (10), and a pressure air activated clamping device (33-38) for frictional arresting of the safety guard (17) relative to the housing (10).

Abstract: A pneumatic turbine, comprising a turbine wheel (13) with a peripheral row of blades (14) and a stator housing (10) having nozzles (11) for directing motive air at high speed onto the blades (14) to rotate the turbine wheel (13), an exhaust passage (15) located downstream the turbine wheel (13), and a particle escape passage (20) located on the same side of the turbine wheel (13) as the air nozzles (11) to drain from the turbine harmful particles and, thereby, avoid a blasting effect of such particles on the turbine wheel blades (14).

Abstract: A speed governor for a pneumatic power tool which comprises a housing (10) with pressure air supply means (16-18) and an air turbine (20) including a turbine wheel (22) drivingly coupled to an output spindle and a number of air nozzles (25) for directing motive pressure air onto the turbine wheel (22), wherein the speed governor comprises a flow controlling valve element (43) associated with an activation piston (44) for adjusting the valve element (43) in response to a control pressure obtained in a pressure sensing opening (34) located opposite an idle running nozzle (28) downstream of the turbine wheel (22).

Abstract: A portable power grinder comprises a housing (11), a rotation motor (10) with a rotor (13) having a rear end portion (27) extending out of the motor (10), an output shaft (22) which is drivingly coupled via a reduction gearing (23) to the rotor shaft (13) and intended to carry a grinding tool, and a speed governor (18) for providing a constant motor speed. The reduction gearing (23) comprises a gear (24) integral with the rotor shaft (13) and another gear (25) integral with the output shaft (22). Alternative rotor shafts (13) with gears (24) of different sizes may replace each other for obtaining different gear ratios and different output speed levels, and the length of the rear end portion (27) of the rotor shafts (13) varies with the size of the integral gear (24). The housing (11) has a detachable lid (15) carrying the speed marking (2) of the tool and having an internal projection (28) of a size directly related to the speed level readable on the speed marking (21).

Abstract: An overspeed safety device for a pneumatic rotation motor comprises a housing (10, 18) and a valve element (28) which is located in a bore (27) in the housing (10, 18) and which by a trip device (29, 31) is locked in a normally open position and arranged to block at least the main part of the air supply to the motor when shifted to a closed position, and an activating device (37, 38) coupled to a rotating part (14) of the motor and arranged to be shifted by inertia forces from a normal rest position to an active position at a predetermined motor speed level. The trip device (29, 31) comprises an open spring wire lock ring (29) pretensioned toward a closed condition and located in a groove (30) in the valve element (28), and a holding device (31) normally located between the ends of the lock ring (29) to maintain the lock ring (29) in an expanded condition in which its outer diameter exceeds the inner diameter of a shoulder (32) in the bore (27).

Abstract: A vibration damped hand held rivet bucking tool having a vibration exposed inertia member (10) provided at a forward end with a rivet engaging implement and a handle (12) insulated from the inertia member (10) by means of two pretensioned coil-type springs (15, 16) which have different diameters and which are located with the small diameter spring (16) inside the large diameter spring (15). A sleeve element (17) connected to the inertia member (10) is located between the springs (15, 16), and a central rod (18) connected to the handle (12) extends into the small diameter spring (16). The large diameter spring (15) acts between a shoulder (23) on the sleeve element (17) and the handle (12), respectively, whereas the small diameter spring (16) acts between an inner shoulder (24) on the sleeve element (17) and an outer shoulder (26) on the central rod (18). A central bore (20) in the inertia member (10 ) accommodates the springs (15, 16) and the sleeve element (17).