Abstract: A screw setting tool including a housing (1), a tool spindle (8) located in the housing (1) and axially displaceable relative thereto, a bit stop (2) provided in the housing (1) for limiting an axial displacement of the tool spindle (8) in a direction opposite to the screw-in direction and adjustable in a direction parallel to a screw-in direction, a spring (10) for biasing the tool spindle (8) in the screw-in direction, and a torque clutch (3) for connecting the tool spindle (8) with a drive motor, the torque clutch (3) having a first clutch member (4) driven by the drive motor, a second clutch member (6) fixedly connectable with the tool spindle (8) for joint rotation therewith, and an intermediate clutch member (5) located between the first and second clutch members (4, 6) and supported on the tool spindle (8) for rotation therearound and an axial displacement relative thereto between an entraining position, in which the intermediate clutch member (5) transmits torque from the first clutch member (4) to th

Abstract: An improved torque limiting screwdriver including a shaft extending from a first end of the screwdriver body, the shaft including a first indicia thereon, and an adjustment cap arranged to be located at a second end of the screwdriver body. The adjustment cap rotatable to selectively engage a selected detent located on the bottom of the adjustment cap. The selective rotation of the adjustment cap is aligned with indicia on a selected detent, indexing of both the indicia on the shaft and the indicia on the adjustment cap, providing an accurate specific torque value for the torque limiting screwdriver.

Abstract: An automatic shaft lock is incorporated into the transmission or drive components of a power driving tool of the type commonly used to tighten or loosen threaded fasteners, for example. The automatic shaft lock operates to prevent an externally-applied rotational back-force or back-torque, such as results from use of the tool to manually tighten or loosen a fastener, from being transmitted all the way through the drive components to the tool's motor or armature shaft. The shaft lock also effectively reduces the amount of back-torque, functioning automatically in either rotational direction, due to being disposed at an intermediate location in the drive train, between an intermediate gear enmeshed for driving rotation with the tool's armature shaft and an output gear enmeshed in a driving relationship with the tool's output shaft.

Abstract: A clutch mechanism for a screw tightening machine having a clutchment and a main shaft, the clutchment interlocking with a screw tightening machine driving mechanism, the main shaft holding a screw tightening driver bit, the clutchment and the main shaft opposing each other along the center of the driver bit with the main shaft being urged with a spring to move away from the clutchment, so that the main shaft is engaged with or released from the clutchment, the clutch mechanism includes: a plurality of first clutch claws around the circumference subtending the center of the shaft, the first clutch claws being projecting on an end of the main shaft; second clutch claws meshable with the first clutch claws, the second clutch claws being arranged on the clutchment to make a predetermined amount of pivotting about an axis from such a position as to squarely oppose the first clutch claws, the axis being perpendicular to the center of the shaft, the second clutch claws being always urged in the squarely opposed pos

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 power driven screwdriver including a housing, a spindle rotatably and axially movably disposed within the housing, a motor for driving the spindle, and a clutch mechanism interposed between the motor and the spindle. The clutch mechanism includes a drive clutch member rotatably driven by the motor, a driven clutch member rotatable with the spindle, and a drive clutch shifting mechanism. The drive clutch shifting mechanism is operable to move the drive clutch member from a first position to a second position spaced from the first position in a forward direction toward the driven clutch member when the driven clutch member is brought to engage the drive clutch member. The drive clutch shifting mechanism is also operable to move the drive clutch member from the second position to the first position when the driven clutch member is brought to be disengaged from the drive clutch member.

Abstract: A device comprises a housing having a planetary gear reduction mechanism accommodated therein and a handle projecting therefrom, an electric motor or like rotation source attached to the housing for inputting power to the reduction mechanism, an outer socket coupled to an internal gear of the reduction mechanism and engageable with a nut, an inner socket coupled to a planetary gear support frame of the reduction mechanism and engageable with a bolt tip, and a torque detecting control mechanism for detecting a nut tightening force to discontinue supply of power to the rotation source upon the tightening force reaching a predetermined value. A friction ring is provided between the housing and the support frame coupled to the inner socket to effect frictional engagement therebetween. A definite axial tension is available by rotating the outer socket, i.e., the nut, with the inner socket in a fixed state.

Abstract: Disclosed is a torque-adjustment controller for use with a tool to safely adjust and control the torque the tool works on a workpiece. The torque-adjustment controller mainly consists of a housing, an output shaft, an input shaft, a stepped ring, a lugged movable member contacting the stepped ring, a torque spring disposed between the output and the input shafts. The output shaft has recesses to engage with steel balls contained on the input shaft so that force exerted on the input shaft by a tool may be transmitted to the output shaft via the engagement of the steel balls with the recesses of the output shaft. The stepped ring has multiple sets of steps providing different head drops and will cause the lugged movable member contacting it to shift axially when the stepped ring is rotated. The axially shifted movable member will further compress the torque spring to generate stronger torque or release the torque spring for the same to generate weaker torque.

Abstract: A torque-limiting tool which comprises a drive member and a driven member. A plurality of balls extends from one of the members; a corresponding plurality of cylinders extends from the other. The relationship of the drive member and the driven member is such that when a torque is applied to the drive member, the balls and the cylinders engage and drive the driven member until a predetermined torque is applied. Once this torque is attained, the balls and cylinders mutually rotate so as to release the driven member. A calibration screw adjusts the overlap between the balls and cylinders to calibrate the limiting torque.

Abstract: A power tool for two-step tightening of screw joints by a first high speed step for tightening the screw joint to a predetermined torque snug level (T.sub.1) and a second low speed step for tightening the screw joint to a desired final torque level (T.sub.2). The power tool (10) includes an electric motor, an output shaft (17), a mechanical power transmission coupling the motor to an output shaft (17), a power supply (11) connected to the motor, signal producing device (16) delivering a signal reflective of the output torque of the tool (10), and a comparator device (19, 23) for comparing the torque reflective signal with predetermined limit values corresponding to the torque snug level and to the desired final torque level and for delivering power shut-off initiating signals as the torque reflective signal attains these limit values. The power tool (10) comprises a torque and speed responsive override clutch (30) for limiting the output torque to a safety torque level (T.sub.

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 screw tightening power tool, comprising a rotation motor, a power supply (27) connected to the motor, an output shaft (13), a torque responsive release clutch (14) including a driving half (16) and a driven half (17) and coupling the motor to the output shaft (13), an activating rod (26) coupled to the power supply (27), a latch means (24) associated with one of the clutch halves (16) and cooperating with the activating rod (26), and a cam (30) associated with the other of the clutch halves (17) and operatively connected to the latch (24) for making the latch shift from an activating rod (26) supporting position to an activating rod (26) releasing position as the transferred torque has reached the actual preset release torque level of the clutch. The cam (30) comprises a spindle (30) which is rotatively supported relative to the driven clutch half (17) for a limited rotational movement relative thereto.

Abstract: A device for driving a screwdriver spindle has a claw clutch and an over-detent clutch. The two clutches are arranged coaxially to each other and have coupling parts which are displaceable in an axial direction. Upon a first response of the over-detent clutch, the claw clutch is disengaged, a correspondingly axially displaceable coupling part of the claw clutch is then locked in a disengaged position by a disengageable safety which is simply a radially elastically expandable clamping sleeve which is connected to the claw-clutch and has a detent projection which protrudes radially inward. The screwdriver spindle on which the clamping sleeve is arranged has two circumferential grooves for engagement of the detent projection, the axial center-to-center distance of which is greater than the coupling stroke of the claw clutch.

Abstract: To improve a power-operated screwing tool machine comprising a drive arranged in a housing, a screwing tool and a switch-off means for the screw-in depth including a depth stop held on the housing for fixing a screw-in depth and a clutch arranged between the drive and the tool drive shaft and transferrable by axial displacement of the tool drive shaft from a position of rest in the direction of the drive into a working position, the clutch comprising a clutch element driven by the drive, a clutch element connected to the tool drive shaft and an intermediate clutch element arranged between these clutch elements, with the intermediate clutch element forming with a first one of the clutch elements an entrainment clutch and with the second clutch element a release clutch, such that in addition to a switch-off means for the screw-in depth, the screwing tool machine comprises a switch-off means for the screw-in torque, it is proposed that the switch-off means for the screw-in depth be adapted to be switched over in

Abstract: A safety clutch for a motor-driven hand tool breaks the rotational drive train when a working tool becomes seized in a receiving material. The safety clutch includes coupling members (25) positioned in a part (22) for transmitting rotational movement to the working tool. The coupling members (25) are radially displaceable within the part (22) between a first position rotatably connecting the part and a power take-off spindle (21) and a second position releasing the connection between the part and spindle. An annular inertial mass (28) rotates with and is rotatable relative to the part (22). The mass (28) has recesses (31) in its inner surface for receiving the coupling members (25) in the second position, and it has support surfaces for holding the coupling members (25) in connecting engagement in recesses (27) in the spindle in the first position.

Abstract: An ajustable torque controlling mechanism has a drive shaft for driving connection with a member to be driven and a torque releasable clutch connected with the shaft and including a wear resistant torque sensitive ball detent release device and a compression spring rate adjusting arangement including radial arms on the clutch co-acting with generally ellipsoidal control edges carried by the housing surrounding the shaft.

Abstract: A screw driving tool comprises a housing in which are located two plates having recesses therein in which balls are received. One plate is adjustable located in the housing whilst the other plate is slidable therein and biased by a spring towards the located plate. The balls provide a driving connection between the plates to transmit the drive from a power tool, in which a shaft connected to the slidable plate is received, to a screw driving bit received in a bore of the other plate. When the screwing torque reaches a predetermined amount the force of the spring is overcome and relative rotation of the plates can occur and the driving bit can cease to rotate with the shaft.

Abstract: A tightening apparatus includes a drive motor and a bit are coupled to each other by engagement of a clutch mechanism, the engagement thereof being maintained by a force of a spring one end of which is coupled to the clutch mechanism and the drive motor is released from engagement with the bit when the tightening torque of the bit exceeds a value corresponding to the force of the spring. The tightening apparatus comprises a cylinder and a plunger encased in the cylinder for holding the other end of the spring. The plunger is movable by a drive mechanism such that the force of the spring is varied, whereby the tightening force to be applied to the bit is adjustable in accordance with the position of the plunger as adjusted by the drive mechanism.

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 screw-driver includes, disposed inside a driving handle, a torque limiter having a torsion spring in which one end of a helical friction band carries a ring connected by axial splines to a stem of the tool while the corresponding end of the torsion spring is fixed to a ring connected to the stem by a helical spline. An adjusting sleeve solely movable in rotation is screwed on the stem and, when it rotates, causes an axial displacement of the stem and modifies the relative angular setting of the two end rings, i.e. the torsion of the spring and consequently the value of the sliding torque.

Abstract: A clutch for power screwdrivers. It has a transmission, an adjustable bit stop, and a drive shaft. It also has a cogwheel with cams on one face and a clutch disk with catches on one face mounted on the drive shaft. The object is a low-noise, wear-resistant clutch. The drive shaft is in one piece. An intermediate disk with catches on one face and cams on the other face is positioned between the cogwheel and the clutch disk. A spring mechanism is positioned between the cogwheel and the intermediate disk.

Abstract: A device for rotating a screw into or out of a workpiece, the device being connectible to a power drill and including a screw driving member. There is provided between the power drill and the screw driving member a mechanism for determining the direction of rotation of the screw-driving member and a torque-adjusting mechanism for controlling the depth a screw is to be driven into a workpiece and including clutch means rotatably associated with the rotational-direction determining mechanism. The rotational-direction determining mechanism comprises a planetary gear system, whereof the planet carrier is adapted to be locked to effect rotation of the screw-driving member in a screw-extraction sense (i.e. reverse rotation) or to be released to effect rotation of the screw-driving member in a screw-insertion sense (i.e. forwards rotation).

Abstract: A tool bit for facilitating the application of a cigar lighter socket to an apertured mounting plate in an automobile, comprising a driving member having a shank receivable in the chuck of a power tool, and a separate shouldered plug member carried by the driving member and having a portion receivable in the mouth of the cigar lighter socket for the purpose of rotatably driving the same. Threads at the rear of the socket are screwed into mating threads of a clamping shell which is usually hand-held at the rear of the panel. The driving member and plug member can rotate with respect to one another against the action of a spring-charged clutch or detent on the members. When the plug member is inserted into the socket mouth it becomes keyed to the socket and effects a rotation of the same as power is applied to the driving member. When the desired torque is reached, the clutch slips, thereby insuring against overtightening and possible damage to the parts.

Abstract: An automatic, push-to-start, fluid-operated screwdriver is disclosed including a magazine providing a supply of fasteners so that only a source of fluid pressure is required for operation. A control valve is responsive to push-to-start actuation for automatically initiating a series of steps including (a) commencing operation of a fluid operated motor, (b) terminating operation of the motor when a predetermined torque level is applied to the fastener, (c) causing a subsequent fastener to be released from the magazine, (d) relatively shifting a fastener holder and rotary drive means for allowing the subsequent fastener to enter into alignment with the rotary drive means, (e) causing the holder to secure the fastener in engagement with the rotary drive means, and (f) thereafter returning to the condition prior to step (a) so that the machine is automatically conditioned for driving the subsequent fastener upon push-to-start actuation.

Abstract: A tool for use by an operator in the field in attaching and securing a bushing assembly within an electrical connector and subsequently connecting or disconnecting the electrical connector and a terminal of an electrical apparatus to establish a connection from a remote location through the use of an insulated implement, such as a hot-stick. The tool includes an operating member with a wrenching configuration for engaging a complementary wrenching arrangement in the bushing assembly, a wrenching portion for direct wrenching of the operating member and a torque responsive device through which the insulated implement is coupled to the operating member to enable rotation of the insulated implement relative to the operating member upon exceeding a predetermined torque indicative of the appropriate seating of the electrical connector upon the terminal so that such relative rotation serves as an indication to the operator that the connection is complete.

Abstract: A torque control tool for installing and removing threaded fasteners couples a driven section of the tool with a drive section of the tool through detent balls of the former and a clutch plate of the latter. The clutch plate keys to a stem of the drive section for rotation together and has semi-spherical sockets of substantially the same radius of curvature as the balls receiving the balls and lying on a circle about a rotational axis of the driven section. A carrier plate cages the balls so that they index with the clutch plate sockets and keys to the balance of the driven section to transmit torque to it. Reliefs to the side of each socket and centered on the circle of the sockets permit the detent balls to uncouple from the drive section at an applied installation torque less than the uncoupling torque in the opposite, removal direction.

Abstract: A torque-limiting adapter for an elongated, insulative hot line clamp stick is provided which allows completely safe, accurate take-up of workpieces only to desired torque levels. The adapter preferably includes an elongated, tubular, axially rotatable head removably mounted onto the work end of a conventional clamp stick and housing a torque-limiting device; the input of the device is connected to the existing rotatable clamp stick, while the torque output of the device is connected to a manipulative tool, such as a pivotal hook. The tool is coupled to the head such that they rotate in unison until the desired torque level is reached, and is further coupled for axial shifting into and out of the head for safety purposes.

Abstract: An electrically operated fastening appliance with an automatic controlling clutch mechanism by which on termination of the fastening operation the power transmission from the motor (13) to the driving spindle (36) is instantly discontinued to prevent application of the excessive torque to the screw-threaded connecting means to be tightened and transmission of undesired reversing torque.The automatic controlling clutch mechanism includes a central gear (40) secured to a drive shaft (38) derived from the motor (13), planetary gears (30) supported on a planet carrier (32) and an annulus member (29) with an internal gear (28) accommodated turnably in a cylindrical casing (14) and clutch elements interposed between the annulus member (29) and the casing (14).