Abstract: A ratchet connector includes a driving element, a control ring, and a working element. A tooth block is disposed in an open groove of the driving element. Both sides of the tooth block have several teeth. The control ring is mounted on the driving element to control the tooth block to move along the bottom of the open groove. The working element is mounted on the driving element. The teeth of the tooth block engage with the ratchet teeth on an inner surface of the working element.

Abstract: A fluid-operated torque wrench for tightening or loosening a fastener has a housing having two housing portions including a cylinder portion and a driving portion, cylinder-piston means arranged in the cylinder portion and movable along a first axis, a lever-type ratchet mechanism arranged in the driving portion and connected to the cylinder-piston means to be driven by the later, the lever-type ratchet mechanism having a ratchet turnable about a second axis which is perpendicular to the first axis, at least three connecting elements including first and second connecting elements receiving a given turning force acting in one direction during operation of the wrench, and a third connecting element receiving a turning force in an opposite direction during operation of the wrench and being equal to the given turning force acting in the one direction, so that one of the turning forces turns a fastener to be tightened or loosened while another of the turning forces is transferred to a stationary object.

Abstract: A torque wrench includes an operation bar having a mounting sleeve, a hollow handle having an inner wall provided with a first toothed portion and a plurality of positioning grooves, and an adjusting unit including an adjusting knob movable relative the handle and having an outer wall provided with a second toothed portion detachably engaged with the first toothed portion of the handle and a positioning block detachably locked in one of the positioning grooves of the handle. Thus, the adjusting knob is initially pulled outwardly relative to the mounting sleeve and the linking rod and is then rotatable relative to the handle so as to adjust the torque values of the torque wrench.

Abstract: An electronic torque wrench (10) offers a plurality of selectable functions. It includes a control unit provided with a memory card reader (14) and at least one removable memory card (15) equipped with preset activation codes. The control unit reads the activation codes of the memory card contained in the reading unit and enables the wrench functions selected among the many available ones according to the activation codes stored in the memory card.

Abstract: A power tool including a drive assembly including a first clutch assembly having an engaged configuration, in which the first clutch assembly transfers a drive force from a motor shaft to a spindle, and a disengaged configuration, in which the first clutch assembly prevents the transfer of the drive force. The first clutch assembly can be movable toward the disengaged configuration when a torque exerted on the spindle exceeds a torque limit. The drive assembly can also include a second clutch assembly having an engaged configuration, in which the second clutch assembly transmits the drive force from the motor shaft to the spindle, and a disengaged configuration, in which the second clutch assembly prevents the transmission of the drive force. The second clutch assembly can be movable toward the engaged configuration when the tool element engages a workpiece.

Abstract: A torque-limiting mechanism is provided for use in a variety of torque-applying tools. The mechanism includes a handle defining a housing in which are disposed a slip gear and a fixed gear. The fixed gear is attached to the housing while the slip gear is attached to drive body extending outwardly from the housing and engageable with an item to be turned utilizing the tool. The slip gear and the fixed gear are connected by teeth disposed on each gear and by ball bearings disposed within recesses located on each gear that are pressed into the recesses by a force exerted on the gears by a number of spring members disposed between an enclosed end of the housing and the fixed gear. The amount of force exerted by the springs on the gears can be varied as necessary, thereby allowing the amount of torque required to enable the slip gear to move with respect to the fixed gear to be set where desired.

Abstract: A power tool and a method of operating a power tool. The power tool can include a housing supporting a motor, a switch assembly, and a fuel gauge. The method can include the acts of activating the switch assembly to electrically connect the motor and a battery, measuring a state of charge of the battery, displaying the state of charge on the fuel gauge before electrically connecting the motor and the battery, and stopping the display of the state of charge before deactivating the switch assembly.

Abstract: An anti-rotation device resists relative rotation between a shank and a tool head within which the shank is supported in an impact tool, for example a rivet gun. The anti-rotation device includes a first anchor portion arranged to grip the shank between the mounting end and the working end of the shank and a second anchor portion arranged to grip the tool head in which the first and second anchor portions are formed integrally with one another of resilient material.

Abstract: A tightening tool for tightening a fastener is disclosed which comprises a motor and a main shaft that engages with the fastener. A clutch is disposed between the motor and the main shaft so that the clutch rotates the main shaft by transmitting torque from the motor to the main shaft when a load acting on the main shaft is less than a predetermined value. The clutch shuts off torque transmission from the motor to the main shaft when the load acting on the main shaft reaches or exceeds the predetermined value. When in use, the current flowing to the motor and rotation angle of the main shaft of the motor are detected. The detected current and rotation angle are used to determine whether the tightening torque of the fastener is normal.

Abstract: A torque adaptor includes a body, a driving portion that rotates with respect to the body when a threshold torque is exceeded, a receiving portion engageable with a workpiece, and a gear plate that drives the receiving portion. The gear plate is driven by the driving portion, the driving engagement between the driving portion and the gear plate being released when a torque required to drive the gear plate exceeds the threshold torque. An adjusting member adjusts the force of engagement between the driving portion and the gear plate so as to adjust the threshold torque. The receiving portion is moveable along a longitudinal direction of the body between a first position in which the receiving portion engages the body such that a rotation of the driving portion rotates the receiving portion and the rotatable workpiece and a second position in which the receiving portion is disengaged from the body.

Abstract: A hand tool includes a handle a shank is inserted into an axial recess in the handle. Multiple first teeth extend inward from an inner periphery of the axial recess. Two plates extend axially from the top end of the handle and each plate includes a hook which has an inclined surface. A movable member is mounted to the top end of the handle and includes two extensions and each extension has a second inclined surface. A tubular member is mounted to the shank and multiple second teeth extend outward from the tubular member and are removably engaged with the first teeth. The two hooks removably hold the tubular member when a large torque is needed to be output, and the two hooks release the tubular member by pushing the movable member to move the two plates outward, the shank and the tubular member can be co-rotated with small torque.

Abstract: A safety torque intensifying tool has a housing, a torque intensifying unit providing at least two modes of operation including a first mode in which the tool operates with a high speed and a low torque and a second mode in which the tool operates with a low speed and a high torque, a grip to be held by a tool operator, an additional element acting as a handle for better gripping in the first mode in which the tool operates with the high speed and low torque and also as a reaction arm to abut against a stationary object to stop the housing from turning in the second mode when the tool operates with the low speed and the high torque, and a switching unit for switching the tool between the first and second modes and configured so that when the operator does not act on the switching unit the tool is in the second mode of operation with the low speed and the high torque, and when the switching unit is switched by the operator while the additional element acts as a handle, the tool is switched to the first mode of

Abstract: Example embodiments of the present invention relate to a torque-limiting tool which includes a central cam having a receiver component, at least one cam holder component surrounding the central cam, propelled by a driving member or a tool handle, wherein the cam holder component includes first portions that substantially complement an external surface of the central cam and at least two second portions providing space for rotation of the cam holder component relative to the central cam, and at least one connection controlling element around the cam holder component having a bending strength to enable the cam holder component positioned to interact with the movement of the cam holder component.

Abstract: A fluid-operated torque wrench for tightening or loosening a fastener has a housing having two housing portions including a cylinder portion and a driving portion, cylinder-piston means arranged in the cylinder portion and movable along a first axis, a lever-type ratchet mechanism arranged in the driving portion and connected to the cylinder-piston means to be driven by the later, the lever-type ratchet mechanism having a ratchet turnable about a second axis which is perpendicular to the first axis, at least three connecting elements including first and second connecting elements receiving a given turning force acting in one direction during operation of the wrench, and a third connecting element receiving a turning force in an opposite direction during operation of the wrench and being equal to the given turning force acting in the one direction, so that one of the turning forces turns a fastener to be tightened or loosened while another of the turning forces is transferred to a stationary object.

Abstract: A hand tool includes a handle a shank is inserted into an axial recess in the handle. Multiple first teeth extend inward from an inner periphery of the axial recess. Two plates extend axially from the top end of the handle and each plate includes a hook which has an inclined surface. A movable member is mounted to the top end of the handle and includes two extensions and each extension has a second inclined surface. A tubular member is mounted to the shank and multiple second teeth extend outward from the tubular member and are removably engaged with the first teeth. The two hooks removably hold the tubular member when a large torque is needed to be output, and the two hooks release the tubular member by pushing the movable member to move the two plates outward, the shank and the tubular member can be co-rotated with small torque.

Abstract: A socket includes a body having a driving portion, a receiving portion engageable with a rotatable workpiece, a first gear portion capable of being operatively driven by rotation of the driving portion in a fastening direction and an opposite releasing direction, a second gear portion functionally cooperable to drive the receiving portion for rotating the workpiece, the second gear portion being constructed and arranged to engage with and be driven by the first gear portion. The driving engagement between the first gear portion and the second gear portion is released when a torque required to drive the second gear portion exceeds the threshold amount of torque. A biasing member applies a force of engagement between the first gear portion and the second gear portion, and an adjusting member functionally cooperable with the biasing member adjusts a magnitude of the force of engagement to adjust the threshold amount of torque.

Abstract: A power tool including a drive assembly including a first clutch assembly having an engaged configuration, in which the first clutch assembly transfers a drive force from a motor shaft to a spindle, and a disengaged configuration, in which the first clutch assembly prevents the transfer of the drive force. The first clutch assembly can be movable toward the disengaged configuration when a torque exerted on the spindle exceeds a torque limit. The drive assembly can also include a second clutch assembly having an engaged configuration, in which the second clutch assembly transmits the drive force from the motor shaft to the spindle, and a disengaged configuration, in which the second clutch assembly prevents the transmission of the drive force. The second clutch assembly can be movable toward the engaged configuration when the tool element engages a workpiece.

Abstract: A clutch assembly for use with a torque limiting driver. The clutch assembly comprises two relatively roatable clutch plates, a driving plate and a camming plate, that face one another, with a plurality of rolling members housed between the two members. When the rolling members are in the override position, the recesses form individual housings for the rolling members that include a gap located between the rolling members and a respective curvilinear base area of the drive plate. The clutch assembly is secured to a drive shaft by a pin, which is supported by a pair of wheels located on opposing sides of the pin.

Abstract: A device for marking or identifying a female recess tool for clamping a mobile element (such as a nut), characterized in that it is adapted to be completely inserted in the female recess and maintained therein by frictional forces. It is then easy to identify, for example, features peculiar to the tool.

Abstract: An overload clutch assembly for a power tool having two torque settings through which rotary drive is transmitted to a spindle. The overload clutch assembly is capable of being between switched between the two torque settings by at least one actuator. The clutch assembly comprises a carrier rotationally mounted on a output clutch spindle; a first clutch plate operational for transmitting torque below a first level; and a second clutch plate operational for transmitting torque below a second level higher than the first; and characterised in that, when the overload clutch is in the higher torque setting, the torque is transferred from the carrier to the output clutch spindle via the second clutch plate only.

Abstract: Example embodiments of the present invention relate to a torque-limiting tool which includes a central cam having a receiver component, at least one cam holder component surrounding the central cam, propelled by a driving member or a tool handle, wherein the cam holder component includes first portions that substantially complement an external surface of the central cam and at least two second portions providing space for rotation of the cam holder component relative to the central cam, and at least one connection controlling element around the cam holder component having a bending strength to enable the cam holder component positioned to interact with the movement of the cam holder component.

Abstract: A torque screwdriver structure that has a positioning bar, a fixing ring, fixing balls, a sliding tube, a spring and a torque adjusting tuber providing strong mechanism between clutch and torque-adjusting button and being easy in use and simple in assembly when manufacturing.

Abstract: A method for assembling a torque-limiting driver, and the resulting drive. The method comprises the steps of providing a handle having a housing, drive assembly, and a testing assembly. The drive assembly is assembled, inserted into the testing assembly and calibrated. The drive assembly is then removed and inserted into the housing of the handle and secured to the handle.

Abstract: An overload clutch assembly for a power tool having two torque settings through which rotary drive is transmitted to a spindle. The overload clutch assembly is capable of being between switched between the two torque settings by at least one actuator. The clutch assembly comprises a carrier rotationally mounted on a output clutch spindle; a first clutch plate operational for transmitting torque below a first level; and a second clutch plate operational for transmitting torque below a second level higher than the first; and characterised in that, when the overload clutch is in the higher torque setting, the torque is transferred from the carrier to the output clutch spindle via the second clutch plate only.

Abstract: An electric screwdriver capable of reducing the reactive force produced on the occasion of a screw tightening work, etc. The electric screwdriver is designed to transmit the rotational driving force of a first motor to the bit through a bit holder, and it includes a flywheel rotatively driven by a second motor in the direction same as the direction of rotation of the bit holder, a brake generating a reactive force in the direction offsetting the reactive force transmitted from the bit to the body casing through the bit holder, by braking the flywheel, and a brake operating mechanism for operating the brake in response to the magnitude of the reactive force transmitted from the bit to the body casing through the bit holder.

Abstract: A torque-limiting mechanism is provided for use in a variety of torque-applying tools. The mechanism includes a handle defining a housing in which are disposed a slip gear and a fixed gear. The fixed gear is attached to the housing while the slip gear is attached to drive body extending outwardly from the housing and engageable with an item to be turned utilizing the tool. The slip gear and the fixed gear are connected by ball bearings disposed within recesses located on each gear that are pressed into the recesses by a force exerted on the gears by a number of spring members disposed between an enclosed end of the housing and the fixed gear. The amount of force exerted by the springs on the gears can be varied as necessary, thereby allowing the amount of torque required to enable the slip gear to move with respect to the fixed gear to be set where desired.

Abstract: A clutch assembly for use with a torque limiting driver. The clutch assembly comprises two relatively rotatable clutch plates, a driving plate and a camming plate, that face one another, with a plurality of rolling members housed between the two members. The driving clutch member has a face comprising a plurality of radially spaced flat areas and a plurality of recesses interposed between the flat areas, with the recesses comprising a curvilinear base area. The second camming clutch member has a face comprising a plurality of radially spaced flat areas and a plurality of opposing downwardly sloped planar surfaces interposed between said flat areas, with the planar surfaces forming an angle. The rolling members are movable from an engaged position with the clutch members to an override position. When the rolling members are in the override position, the recesses form individual housings for the rolling members that include a gap located between the rolling members and a respective curvilinear base area.

Abstract: A pneumatic screwdriver having an adjustable clockwise torque and a maximum counterclockwise torque includes a transmission seat having at least one steel ball hole and a through hole. The steel ball hole installs a steel ball and has a clockwise rotating area and a counterclockwise rotating area. With a first leaning portion perpendicular to the clockwise rotating area, the steel ball is separated from the steel ball groove easily, so that the transmission seat, steel ball, and steel ball groove slide with each other, and the compressing strength of the torque spring is adjusted to change the clockwise torque. With a second leaning portion disposed with an inclination on the counterclockwise rotating area, the steel ball is stopped from being separated from the steel ball groove, thus the steel ball cannot slide with the transmission seat, and a maximum torque can be outputted directly when the screwdriver is turned counterclockwise.

Abstract: A pulse torque generator utilizing a magnetic coupling, and an electric power tool provided with the pulse torque generator. The pulse torque generator includes an input shaft extending in its axial direction and having a hollow section providing a hollow space, and an output shaft rotatably provided in the hollow space. A magnetic fluid is encapsulated in a hollow space between the input shaft and output shaft. A magnetic field generating unit is disposed, and magnetic segments are provided in the input shaft. A magnetic fluid provides a magnetic fluid bridge bridging between the input shaft and the output shaft each time the magnetic segment is brought into confrontation with the magnetic field generating unit.

Abstract: A screwing tool with a device to adjust transmitted torque comprises a handle to introduce a torque to the device, which is borne in the hollow of the handle and a drive shaft as an output element of the torque. On the drive shaft inside the handle, two separate couplings are assembled, having between them a compression spring exerting a spring force against the two couplings. Each coupling comprises a first and a second socket engaging each other by gearings at their opposing faces. The maximum torque at which the torque transmission will be interrupted can be adjusted by an adjustment element wherein the distance between the couplings can be changed, thereby resulting in a change of the tension of the spring exerting a load on the couplings. The teeth of the gearings slide and the sockets rotate relatively to each other and interrupt the torque-transmission if a pre-adjusted torque is exceeded.

Abstract: A torque screwdriver including a handle formed with a window. An indicator is disposed in the handle near the window. A scale is axially movably mounted in the handle. The scale is drivingly connected with a compression mechanism disposed at one end of the handle and a resilient mechanism. The scale is drivable by the compression mechanism to compress the resilient mechanism. The compression distance is obtainable by means of observing the relative positions between the indicator and the scale through the window. The resilient mechanism is drivingly connected with an axially slidable lower toothed tray for transmitting the torque to an upper toothed tray pivotally mounted at the other end of the handle. The upper toothed tray is drivable by the lower toothed tray to output the torque.

Abstract: A hand-held power screwdriver includes a low-noise torque clutch (5) for transmitting torque to a tool spindle (4) and formed of claw clutch (6) and ratchet clutch (7), with the ratchet clutch (7) having a rotatably driven first ratchet member (7a) and a second ratchet member (7b) both having, respectively, oppositely oriented, circumferentially arranged, oblique cams (9), with the claw clutch (6) having a first claw member (6a) and a second claw member (6b) having oppositely oriented claws (11), respectively, the first claw member (6a) of the claw clutch (6) being fixedly connected with the second ratchet member (7b) of the ratchet clutch (7) for joint rotation therewith, and with the screwdriver further including at least one engagement member (12) for connecting the second claw member (6b) with the tool spindle (4) for joint rotation therewith and for disconnecting the claw member (6b) from the tool spindle (4) and a retaining element for connecting the second claw member (6b) of the claw clutch (6) with t

Abstract: A manually-operated, adjustable dental implant torque wrench employs a screw holding sheath for placing a dental screw in a mouth of a patient. A handle offset to avoid opposite teeth to the work area is provided with a bevel gear and pinion set to translate the turning motion from a straight turning shaft in the handle to a perpendicular screw turning head. An assortment of replaceable snap-fit screw turning heads fits the various types of dental screws. An easy turn T-shaped handle with a pivotable turning knob is controlled by a torque limiting device.

Abstract: An electrically powered, hand-held screw driver (2) has a housing (4), a depth stop (6) arranged on this housing (4), a drive motor (20), an axially displaceable tool spindle (8) operatively coupled with a tool holder (11), and a torque coupling (16) arranged between the drive motor (20) and tool spindle (8) and which has a motor-side coupling part (22) and a tool-side coupling part (24) connected to the tool spindle (8) so as to be fixed with respect to rotation relative to it. The two coupling parts (22, 24) can be made to engage with one another and the tool spindle (8) is biased away from the motor-side coupling part (22) by means of a coupling spring (34). The tool-side coupling part (24) has axial movement play (a) relative to the tool spindle (8) and is mechanically coupled with a movement transmitter that is separate from the coupling spring (34).

Abstract: A screwdriver having a handle and a scale for measuring torque transmitted to a screw and having a beam-type spring for transmitting the screwing torque. The handle and spring have a lost-motion connection therebetween, and there is limit stop in that connection. The handle is sealed against the entry of debris. The method of making the screwdriver is also disclosed.

Abstract: A torque adjustable tool includes an active member and a passive member which is removably connected to the active member by two respective clutch portions. Driving power is connected to the active member and the passive member outputs a torque. A spring is mounted to the passive member and biased between an inner periphery of a control member mounted to the passive member and an enlarged portion of the passive member. The control member includes a clamping portion to which a locking member is threadedly mounted. By operating the locking member, the clamping portion can be clamped inward to be securely mounted to the passive member as one piece so as to completely transfer the torque from the driving power, or the clamping portion is opened outward such that the passive member can output a torque that is less than the force applied by the spring.

Abstract: A torque adjustable screw driver includes a handle and a shank connected to an end of the handle. Two disks are mounted to the shank and each have an inclined end surface. The two respective inclined end surfaces contact each other and one of which includes protrusions and the other has grooves which are sized to receive the protrusions. A sleeve is mounted to the shank and a spring is biased between the inner bottom of the sleeve and the two disks so that the two disks can be rotated from each other when the torque is large enough to make the two disks have relative rotational movement. The required torque can be adjusted by rotating one of the two disks to push the other disk to compress the spring.

Abstract: A torque wrench is provided having body and a handle that is rotatably mounted to the body for adjusting the torque setting, and an axially movable sleeve operable to selectively lock the handle. The sleeve includes a rigid member and an elastomeric member, such as an O-ring, and the sleeve is configured to act against a locking ball held in a bore of the handle. The sleeve is selectively movable between two positions: (a) a locked position wherein the rigid member firmly retains the locking ball seated in one of several detents in the body, thereby preventing rotation of the handle; and (b) an unlocked position wherein the elastomeric member biases the locking ball inwardly, deflecting when the locking ball unseats from the detent to permit handle rotation. When the sleeve is in the unlocked position, the locking ball can incrementally “click” over the detents during handle rotation.

Abstract: It is an object of the invention to provide an electric screwdriver that can efficiently transmit torque for tightening a screw and stop the torque transmission. A representative screwdriver may include a motor, first and second rotating members, a tool, a torque transmission spring and a torque transmission releasing device. The torque transmission spring transmits the rotating torque of the motor from the first rotating member to the second rotating member in order to drive the tool by closely winding around the first rotating member and the second rotating member when the motor drivingly rotates the first rotating member in a predetermined rotating direction. Further, the torque transmission releasing device moves in the axial direction of the first rotating member or the second rotating member in response to the screw-tightening torque.

Abstract: A representative screwdriver may comprise a motor, a body, a first spindle, a first clutch member, a tool bit, a second spindle, a second clutch member, a clutch engagement preventing member. The representative screwdriver may be selectively operated in one of a first power transmission mode and a second power transmission mode. In the first power transmission mode, the first clutch member and the second clutch member are disengaged when the reaction torque applied from the work-piece onto the tool bit exceeds a predetermined torque. In the second power transmission mode, the first clutch member and the second clutch member are disengaged when the tool bit moves a predetermined distance away from the body toward the work-piece during the screw-tightening operation. According to the representative screwdriver, the engagement and disengagement of the clutch members during the screw-tightening operation can be assuredly performed in both the operation modes.

Abstract: A torque convertible adapter for driving tools includes a tubular body having an rectangular extension on rear end connected to a handle, a threaded outer periphery, a circular receiving space in front end including three pair of circular recesses in different depth spacedly formed in the bottom thereof, each pair of the circular recesses being symmetrically arranged, three pair of springs in different length and different elasticity respectively disposed into the circular recesses each having a steel ball disposed on free end, a socket spanner having an enlarged circular rear end inserted into the circular receiving space including a plurality of semi-circular recesses engaged with the steel balls, a bolt rotatably secured the socket spanner in the circular receiving space through a central hole in the enlarged circular rear end and the bottom of the circular receiving space, a ring pad sleeved on the socket spanner an a U-shaped cap fastened to the tubular body having a threaded inner periphery engaged with

Abstract: A wrench includes a rod, a retainer, a pressing member, and a casing for receiving the retainer and the pressing member. The rod includes a driving portion on an end thereof for engaging with a fastener. The retainer has a central portion securely mount to the rod to turn therewith. The pressing member is turned together with the casing when the casing is turned. The pressing member has at least one engaging member that is biased to selectively engage with one of plural retaining sections of the retainer, thereby exerting an engaging force between each of the ends of the pressing member and an associated one of the retaining sections of the retainer. When a rotational force applied to the casing is smaller than the engaging force, the retainer and the rod are turned to thereby turn the fastener.

Abstract: A wrench comprises a rod, a retainer, a pressing member, and a casing for accommodating the retainer and allowing relative pivotal movement between the casing and the retainer. The pressing member is received in the casing and slidable along a longitudinal direction of the rod. The pressing member is biased to press against two ends of the retainer, thereby exerting an engaging force between each of two ends of the retainer and an associated one of the ends of the pressing member. When a rotational force applied to the casing is smaller than the engaging force, the retainer and the rod are turned to thereby turn the fastener. When a rotational force applied to the casing is greater than the engaging force, the casing and the pressing member slide while the retainer and the rod are not turned.

Abstract: A longer life screwdriver is disclosed, and the screwdriver includes a ball retained in a through-hole in a manner movable in a radial direction of a driving shaft member, the through-hole being defined in a driving shaft member, the ball being possible to project beyond the driving shaft member along an outer circumference of the driving shaft member, the ball further being possible to abut an end of a clutch spring, and elements for allowing the ball to protrude beyond the driving shaft member along the outer circumference of the driving shaft member in response to axial movement of the output shaft member against a pressing member, the improvement comprising: disengagement elements for releasing engagement between the clutch spring and the ball during the reverse rotation of a motor.

Abstract: A safety clutch for an electric hand-held tool and including a rotor (8), an anchor disc (9) frictionally engageable with the rotor (8) for transmitting a torque there-between, a stationary axial stop (13) for limiting the air gap (s) between the rotor and the anchor disc and engageable by the anchor disc under an axial reserved pre-stress applied to the anchor disc (g); and a stationary electromagnetic coil (11) provided on a side of the rotor (8) remote from the anchor disc (9) and coaxial with the rotor (8) for generating a rotationally symmetrical magnetic flux (&phgr;) for attracting of the anchor disc (g) to magnetic poles (12a, 12b) associated with the rotor (8).

Abstract: A screwdriver of the type having a variable torque-limiting in-line drive with a handle having a cavity and a drive bit disposed in the cavity. Over-ride drive members are disposed in the cavity and a spring exerts a force on the drive members for transmitting only a maximum force to a bit in the screwdriver. Two adjustable controls are at a back end of the tool and they are used to apply a varying force to the spring and thus limit the amount of maximum torque to be transmitted.

Abstract: A torque tool assembly having an elongated unitary, cylindrical main housing and including a drive motor subassembly and a gear train subassembly coaxially supported and operatively connected in the cylindrical housing and held in operative engagement by a resilient spring structure while being mechanically, removably locked together in the main housing whereby loosening and/or mis-aligning of the operative connection between the drive motor subassembly and gear train subassembly from vibration and other loads is substantially precluded.

Abstract: A longer life screwdriver is disclosed, and the screwdriver includes a ball retained in a through-hole in a manner movable in a radial direction of a driving shaft member, the through-hole being defined in a driving shaft member, the ball being possible to project beyond the driving shaft member along an outer circumference of the driving shaft member, the ball further being possible to abut an end of a clutch spring, and means for allowing the ball to protrude beyond the driving shaft member along the outer circumference of the driving shaft member in response to axial movement of the output shaft member against a pressing means, the improvement comprising: disengagement means for releasing engagement between the clutch spring and the ball during the reverse rotation of a motor.

Abstract: A torque limited applicator is useful for a wide variety of purposes where a mechanical device, such as a fastener, is to be driven but a maximum level of torque not exceeded. The applicator is reusable, and preferably easily constructed from integral pieces of plastic. A torque applying element with internal cam followers and a fastener drive structure with a drive element and a cam element may either be removably positioned with respect to each other, or a retaining ring and deformable pin may attach them together. A plug may be provided to reduce the possibility of tampering, provide a tamper evident seal, and to prevent foreign material from entering the area of cooperation between the cam element and cam followers, as well as providing an area for indicia indicating the maximum level of preset torque. Color coding for different torque levels for the applicators may be provided.

Abstract: A tool socket has a tool-associated element provided with first connecting means formed to connect the first tool-associated element with a tool, a second fastener-associated element provided with second connecting means for connecting the second fastener-associated element with a fastener to be tightened and loosened, the tool-associated element and the fastener-associated element having faces directed toward one another, an engaging element for engaging the first tool-associated element and the second fastener-associated element with one another and including gear teeth provided on the faces of the tool-associated element and the fastener-associated element, and a holding element operative for holding the tool-associated element and the fastener-associated element in engagement with one another and having a holding force limit such that when a resistance of a fastener exceeds a predetermined value the first and second elements disengage from one another and the first tool-associated element continues turnin