Abstract: A screw-on electrical connector is employed to connect a plurality of wires using an apparatus that includes a tool bit driver with an electric motor powered by a battery. A torque limiting device transfers torque from the electric motor to a chuck. A mechanism permits adjustment of the maximum level of torque applied to the chuck and indicia is provided indicating torque settings for different combinations of wire sizes and numbers to be connected. A tool is coupled to the chuck and has a member for engaging a screw-on electrical connector in order to twist the screw-on electrical connector onto a plurality of wires.

Abstract: A power screw driver for tightening self-tapping screws comprises a housing (10), a rotation motor, an output shaft (12), a torque limiting release clutch (11) having torque transferring cam unit (17, 19) and a spring biassed thrust element (20) exerting an engagement force on the cam unit (17, 19) and yielding axially to a release position as a desired output torque is reached. A screw bed (32) engaging contact member (31) coupled is to an activation unit (42) and is arranged to be axially displaced via the activation unit (42) of the activation means (42) a lock means (36, 39) from a thrust element (20) locking position during the thread forming phase of the tightening process to a thrust element (20) unlocking position during the final pretensioning phase.

Abstract: A miniature, adjustable torque limiting screwdriver includes an elongated hollow handle internally threaded at one end. A torque-limiting mechanism is disposed within the handle and includes a rigid shaft having a hex inner end and a plurality of flexible resilient fingers engageable with the hex. An adjusting collar encircles and engages the fingers and is threadedly engaged with the handle for axial movement to adjust the force with which the fingers grip the hex end of the shaft. The outer end of the shaft sockets a driver shank. When the handle is rotated it rotates the shank up to a predetermined torque, at which point the flexible and resilient torque members slip with respect to the drive surface portions of the shaft to prevent further torque application.

Abstract: Methods and apparatus are provided for a torque driver including an axially displaceable gear with a biasing assembly to bias the displaceable gear into an engagement position. A rotatable cap is provided with a micrometer dial to select a desired output torque. An intermediate bevel gear assembly is disposed between an input gear and an output gear. A gear tooth profile provides a separation force that overcomes the bias to limit torque at a desired torque limit. The torque limit is adjustable and may be adjusted manually or automatically depending on the type of biasing assembly provided. A clutch assembly automatically limits axial force applied to a fastener by the operator to avoid alteration of the desired torque limit.

Abstract: A tool for installing and removing load break probes, comprising a handle, a body rotatably attached to the handle, the body having an engagement device for non-rotatably engaging a load break probe, and a torque delivery system operatively connected between with the handle and the body. The torque delivery system has a first clutch half attached to the handle and a second clutch half attached to the body. The clutch halves are engaged up to a predetermined torque in a first direction and positively engaged when the tool is rotated in a second direction.

Abstract: An improved fastener installation tool is provided of the type having a fixture pin for seated reception into a mating recess at the shank end of a threaded fastener, while a power-driven socket installs a threaded nut onto the fastener shank. The installation tool includes a spring-loaded clutch assembly for supporting the fixture pin on the tool, wherein the clutch assembly permits fixture pin rotation in response to a torque load exceeding a predetermined limit to prevent fixture pin breakage in the event of a high torque load applied thereto.

Abstract: A power hand tool for driving a fastener a desired depth into a workpiece. The power tool includes a depth adjust sleeve for varying a resulting driving depth of the fastener into the workpiece. A depth indicator is included to allow a user to gauge the resulting driving depth of the fastener into the workpiece based on his adjustment of the depth adjust sleeve. In one embodiment, the depth indicator comprises a marker coupled to the depth adjust sleeve such that its location varies monotonically in response to varying the resulting driving depth, a lens to allow the marker to be clearly seen by the user, and a scale to which the location of the marker is compared. A driving mechanism is then used for driving the fastener into the workpiece until the resulting driving depth is attained.

Abstract: A clutch torque control features a plurality of clutch balls disposed between complementary races of input and output cams which are relatively axially displaceable upon the input cam rolling the clutch balls between matching cam peaks responsive to a drive output reaching a predetermined output torque.

Abstract: A battery type screw driver has an auxiliary switch 39 in addition to a main switch 37. A clutch 30 is provided between a driving shaft 16 and a driven shaft 11. A central bore 32 is formed along the central axis of the driving shaft 16. The operation bar 33 passes through the bore 32. A front end part of the operation bar 33 is connected to the driven shaft 11, while a rear end part thereof protrudes backwardly of the driving shaft 16. An auxiliary switch 39 is disposed in series with the main switch 37 in an electric circuit between the motor 8 and a battery 35. The auxiliary switch 39 is turned on when depressed by the operation bar 33 sliding backward when the screw 24 is fastened. The operation bar slides coaxially with the central axis of the driving shaft.

Abstract: In a power-driven electrical hand tool, especially an electric screwdriver, with a coupling that undoes the drive connection between driving electric motor and tool output shaft when the working process is complete, and with an output shaft mounted so as to be displaced axially with a depth stop, it is proposed that the coupling be configured as a friction coupling which produces the drive connection at least predominantly by frictional engagement on the basis of the applied pressure exerted on the output shaft, which friction coupling separates the drive connection again when the applied pressure is reduced or absent, force deflection elements being provided that transmit the pressure effect received from the applied pressure via the output shaft, with concurrent amplification, to the annular coupling surfaces effecting the nonpositive frictional entrainment.

Abstract: A power operated screwdriver including a support shaft firmly secured to a motor housing, a gear driven by a motor shaft and rotatably mounted on the support shaft, a main spindle slidably mounted on the supported shaft and holding a detachable drill bit, and an intermediate clutch disc slidably mounted on the support shaft between the gear and the main spindle. The gear and the intermediate clutch disc are selectively connected and separated by a first clutch, while the intermediate clutch disc and the main spindle are always connected together by a second clutch. A compression coil spring acts between the support shaft and the intermediate clutch disc and urges the intermediate clutch disc toward the main spindle to disengage the first clutch. With this construction, the a rotational driving force of the gear is transmitted to the main spindle via the intermediate clutch disc and first and second clutches only when the screwdriver is performing a screw-driving operation.

Abstract: A power transmission mechanism for a motorized hand tool, comprising a socket, a first spring set in said socket, a first rotary member inserted in said socket and stopped against said first spring, a revolving shaft inserted through said first rotary member, said first spring and said socket and connected to a power unit, a second rotary member inserted in said first rotary member, a cap attached to said first rotary member at an opposite end, and a second spring retained between said second rotary member and said cap, wherein said gap and said first rotary member are forced to move backwards toward said socket, when the resisting force which acts onto said tool surpasses the driving force from said revolving shaft, causing said second rotary member to disconnect from said first rotary member and said revolving shaft.

Abstract: In an electrically powered combination screwdriver/drill opposing halves of a ratchet type torque tranmsitting clutch are normally biased axially apart by a compression spring. The output half of the clutch is fixed on the output spindle of the tool which is free to move axially within limits. For screwdriving operation, operator bias of the tool against the workpiece overcomes the spring, retracting the output spindle and bringing the clutch halves into engagement. An adjustable stop in the nose of the tool limits axially rearward movement of the output spindle and hence depth of engagement of the clutch teeth, thus providing a variable limit on torque transmitted. For the drilling mode, the rearward half of the clutch is cammed forward so that the clutch is firmly engaged for continuous rotation of the output spindle without specific torque limitation. An operator may switch from drilling mode to screwdriving mode and back without disturbing the torque limit adjustment of the screwdriving mode.

Abstract: A driver with automatic speed and torque switching including two different drive trains which operate in parallel and are driven at the same time by a motor. One drive train provides a high-speed output while the other provides a low-speed output. A single drive head for transmitting torque to the nut is normally coupled to the high-speed output, and not to the low-speed output. The machine operates initially at the high speed for the "free rotation" of the nut. When the nut contacts the surface of the structural body, the drive coupling to the high-speed output is disabled, and the low-speed output (which formerly was not coupled to the drive head) is not at the same time coupled to the drive head. The nut is then driven much more slowly but with a higher driving torque. Within the low-speed drive train there is included a friction clutch, and adjustement means for adjusting the level of torque at which it will slip.

Abstract: A socket wrench device is used to rotate a spark plug. The device includes a socket member with a socket to fit the spark plug. An endless series of ratchet teeth are provided on the socket member so as to engage with another endless series of ratchet teeth which are provided on a driving member. The driving member is retained on the socket member in such a manner that the ratchet teeth of the driving member are engaged removably with those of the socket member. An annular spring element is sleeved on the driving member so as to bias the two series of ratchet teeth to join together. When the device rotates the spark plug to an appropriate position in the cylinder of an internal combustion engine, an external torque which is applied to the device compresses the spring element, so that the ratchet teeth of the driving member are disengaged from those of the driving member, thereby stopping the rotation of the spark plug relative to the cylinder.

Abstract: A coupling for a motor operated screwing tool contains three coupling elements of which one is provided on an output shaft, another one on a drive shaft, and a intermediate, one of which is constructed as a coupling ring (8) which is longitudinally displaceable on the output shaft, whereby a spring (4) is arranged between the drive shaft and the coupling ring urges the latter into engagement with the coupling element on the output shaft. A disengagement without rattling and with low wear is achieved after reaching the limiting torque by means of sloping surfaces (2, 116) at the longitudinally displaceable coupling ring (8) and the output shaft, which sloping surfaces (2, 116) cooperate with the spring (4) and an adjustable depth stop on a tool housing (23), and wherein the movement of the coupling ring (8) is defined by means of two shoulders (10, 11) arranged on the output shaft (6).

Abstract: A driver with automatic speed and torque switching including two different drive trains which operate in parallel and are driven at the same time by a motor. One drive train provides a high-speed output while the other provides a low-speed output. A single drive head for transmitting torque to the nut is normally coupled to the high-speed output, and not to the low-speed output. The machine operates initially at the high speed for the "free rotation" of the nut. When the nut contacts the surface of the structural body, the drive coupling to the high-speed output is disabled, and the low-speed output (which formerly was not coupled to the drive head) is not at the same time coupled to the drive head. The nut is then driven much more slowly but with a higher driving torque. Within the low-speed drive train there is included a friction clutch, and adjustment means for adjusting the level of torque at which it will slip.

Abstract: A power-operated tool is fitted with a drive, whose driving shaft can, by means of a connecting coupling whose actuation depends on the reaction torque, be coupled with a driven shaft. The connecting coupling first interrupts transfer of the torque to the driven shaft, so that, in spite of the running drive, no torque can be transferred to the driving shaft. Immediately afterwards, the drive is disconnected. As a result of this sequence of disconnections, the motor, which continues running, can no longer have any influence on the work in progress so that the fastener being tightened does not reach the point of plastic deformation.

Abstract: A device at impact wrench, particularly for wheel nuts and wheel bolts and of the type which incorporates a shaft (2) with a handle (3) in one end and a socket in the opposite end (4), whereby the shaft between its ends is provided with a hub (6) about which is rotatably arranged an impact arm (8) which carries weights and is arranged to transfer impact movement to the shaft via stops (7) arranged at the hub, whereby in connection to the hub (6) is arranged members (7, 10) arranged to limit the ability of the impact arm (8) to transfer movement to the shaft (2) which carries the socket in one direction of movement of said impact arm.

Abstract: A torque limiting fastener in which a torque limiting coupling between telescoping head and driven elements includes a resilient spring carried by one element and a complementary recess formed in the other element, the engagement of the spring with the complementary recess resisting both axial and rotational displacement of the head element relative to the driven element when the head element is rotated in the tightening direction, and further includes a surface forming one end of the recess engageable by the spring to establish a positive connection between the elements when the head element is turned in the loosening or unscrewing direction.

Abstract: Structural improvement of electric screwdriver with respect to the torsion adjustment thereof, incorporating a torsion mechanism having outer threads in the anterior shell in coordination with a hollow-set torsion adjustment lid having correspondingly provided inner threads, so that manually imposed rotative feeding of the adjustment lid may force the supporting stem to exert depression on the depression spring through the adjustment disk, resulting in vertical engagement of both the upper and the lower ratchet, also in mortise joint of the torsion stem with the lower ratchet; that activation of a finely-touched switch starts the motor to acquire an increased torque by virtue of the main gear in relation to the vernier gear, eventually setting the torsion stem to rotation while locking the screw or else releasing the same, the torsion adjustment lid permissive of multiple-shifted helic adjustments with precision and convenience. The motor being smooth in running, thereby shortens time and labor in work.

Abstract: In a motor-driven screw driving device, a drive unit and a drive member are located within a housing and are interconnected by a torque-limiting coupling. The coupling is adjustable by changing the force applied to a spring element. The spring element is supported within a stop sleeve located within the housing and the stop sleeve is axially displaceable relative to the housing. A depth stop on the drive spindle is adjustable relative to the stop sleeve. An actuating sleeve accessible on the exterior of the screw driving device affords the adjustment of the stop sleeve and the depth stop. A connecting element is secured to the actuating sleeve and is in engagement with the depth stop so that the actuating sleeve and depth stop can be rotated as a unit. The connecting element is selectively engageable with the stop sleeve so that the actuating sleeve and stop sleeve can be rotated as a unit for adjusting the torque-limiting coupling.

Abstract: This invention relates a screwdriver capable of exerting a preset twisting force and characterized by comprising a tubular handle, a twisting rod, an adjusting thimble and a spiral spring. The said twisting rod has circular toothing on its projecting part to be engaged with the corresponding toothing on the block serving as a plug in the handle opening. The said spring fitted over the twisting rod between the projecting part of the rod and the projecting part of the adjusting thimble makes the said toothings engaged tightly. The degrees of engagement is used as measurements of twisting force. When the resistance of turning exceeds the preset twisting force the handle will slide on the said toothings and turn idly. This and the sound produced at this moment will remind the operator that the required torque has reached.

Abstract: A torque limiting power screwdriver includes a housing in which there is supported for rotation and axial displacement a screwdriver spindle. A transmission transmits power from a motor to the screwdriver spindle. A torque overload coupling and a separating coupling are interposed in the transmission, being operative for interrupting the transmission of torque from the motor to the screwdriver spindle. The separating coupling is coupled and uncoupled in response to axial displacement of the screwdriver spindle between its coupling and uncoupling positions. The axial movement of the spindle is accomplished by a trigger movably mounted on the housing and connected by a Bowden cable or a lever transmission to the spindle. The spindle is connected by an axially movable coupling with an output member, especially with a bevel gear transmission accommodated in an angular head housing portion. A switching trigger is used to energize and de-energize the motor.

Abstract: The invention is concerned with a spark plug wrench with provision for adjustment of the torque, the wrench comprising two toothed discs (2, 3) supported within and at one end of a cylindrical housing (1), these discs being provided at their confronting faces with teeth (5) of a form such that, when screwing-out takes place sharply dependent flanks of opposed teeth are applied together to transmit the full force while, when screwing-in takes place, slippage is allowed between the teeth. In one embodiment the inner lying toothed disc (3) is arranged on an axially displaceable attachment spindle (6) and held against rotation. At the opposite end of the housing (1) is a threaded disc (10) with an adjusting ring (11), and the last-mentioned toothed disc (3) is axially displaceable and has a pack of spring washers (16) thereon to produce the required pressure between the discs (2, 3) for transmitting a pre-set torque.

Abstract: A torque limiter with a rotatable housing having a series of dowels arranged annularly about an interior surface thereof and a sleeve having a pair of arms with a roller at the tip of each arm. The rollers are mounted to engage pairs of adjacent dowels selectively for transmitting torque from the housing to the sleeve. A lock-out mechanism disengages the rollers and dowels when a preset torque limit setting is exceeded by torsional resistance of the sleeve relative to the housing.

Abstract: This invention relates to a socket joint for a torque wrench comprising a joint body, a clutch pressed by a spring thereof, and a controlling means for positioning and clutching said clutch so as to make the joint body keep in a condition of idle running when the torsion occurred exceeds a predetermined value.