Abstract: A method to accurately determine and assure proper clamping force or bolt tension in fastening systems comprises statistically sampling washer or flanged bolt lots for clamping force versus deflection relationships, encoding the lots and subsequently installing the fasteners to the prescribed deflections of the lots. A validator and validation method is disclosed that provides the statistical sampling and a corresponding sensor device is disclosed for measuring the deflection as the fastener is installed. Thus, the deflection of the washer or bolt flange as the fastener is installed determines the clamping force applied by the fastener and assures that the proper clamping force has been obtained. The new method and sensor are applicable to special flanged bolt and standard bolt--Belleville washer combinations. No modification of the bolts or washers is required.

Abstract: A tightening device comprises an upper plate, a lower plate disposed below the upper plate in parallel thereto, a nut rotating gear supported by the lower plate so as to be rotatable in a horizontal plane, and a spur gear provided on an underside of the upper plate and meshable with the nut rotating gear for rotating the nut rotating gear. The upper plate has a portion fittable to a flange of an externally threaded member for preventing the rotation of the threaded member, while the nut rotating gear has a portion fittable to a nut. With the nut manually tightened on the threaded member in advance, the flange fitting portion of the upper plate is fitted to the flange, the nut is fitted in the fitting portion of the nut rotating gear, and the spur gear is thereafter rotated, whereby the nut rotating gear is driven to tighten up the nut on the threaded member.

Abstract: A wrench including an operation arm having an operation head at one end for turning a workpiece, a calibration handle connected to one end of the operation arm and turned relative to the operation arm to set the desired index number of torsion, and a lock controlled to lock the calibration handle when the desired index number is set, wherein a transparent socket is mounted around the calibration handle adjacent to the operation arm, having a lens, which magnifies the index number of torsion for accurate calibration.

Abstract: Embodiments of a dental wrench are disclosed which may be used to tighten or loosen screws used for dental components and which may further be used to determine the amount of torque applied to such a screw and the amount of torque necessary to loosen such a screw.

Abstract: Methods and apparatus are provided for a torque driver including a laterally displaceable gear support member to carry an output spur gear. A biasing assembly biases the output spur gear into engagement with a pinion to which is applied an input torque greater than a desired output torque limit for a threaded fastener such as a nut or screw. A coiled output linkage connects the output spur gear with a fastener adaptor which may be a socket for a nut. A gear tooth profile provides a separation force that overcomes the bias to limit torque at the desired torque limit. Multiple fasteners may be rotated simultaneously to a desired torque limit if additional output spur gears are provided. A gauged selector mechanism is provided to laterally displace multiple driver members for fasteners arranged in differing configurations. The torque limit is selectably adjustable and may be different for fasteners within the same fastener configuration.

Abstract: An improved combined torque limiting and part marking wrench according to the present invention includes: a torque-applying handle; a housing pivotally mounted to the handle, the housing adapted to receive a releasably mounted, replaceable, part-engaging head assembly at a second end thereof; and a part-marking mechanism mounted within the housing. The part-marking mechanism includes a marking tip which passes through a bore in the head assembly for marking a part. A mechanical linkage arm is pivotally connected to the torque-applying handle. A pivotable cam is pivotally connected to the linkage arm and in operative engagement with the part-marking mechanism for moving the marking tip through the bore, such that, when torque on a part has reached a predetermined value, the torque applying handle moves the linkage arm, which pivots the pivotable cam, thus forcing the pivotable cam against the part marking mechanism, which causes the marking tip to extend outwardly from the housing to mark the part.

Abstract: A hand tool formed by a body member 10B and a torque sleeve member 12S is employed to tighten a connector nut 14N at the end of an electrical cable 14C onto a cable terminal post 14P. The body is elongated having a long axis with a socket wrench 10W at one end and a handle 10H at the other end. A cable channel 10C extends along the long axis from the wrench end to the handle end for receiving the cable during installation. The inside surface of the wrench has side walls 10SW for capturing the connector nut. The outside surface of the wrench has a slight taper toward the wrench end of the body, and the inside surface of the sleeve has a generally matching taper. The sleeve is slide mounted over the wrench and the connector nut for establishing a pre-load hoop tension in the sleeve against the wrench which establishes a pre-load compression in the wrench against the connector nut. The engagement of the matching tapered surfaces causes the pre-load hoop tension to increase as the sleeve is slid over the wrench.

Abstract: A nut runner for applying torque to a workpiece such as nut, bolt or the like positioned at a right-angle to the fastening device. The nut runner includes a motor, a speed reduction gear assembly, a right-angle bevel gear system, a planetary gear system, an in-line torque transducer disposed between the bevel gear system and the planetary gear system, a torque reading transmitter, and a workpiece engaging member. The bevel gear system, planetary gear system and torque transducer form a concentrated assembly which provides for a compact nut runner to access confined assembly areas. The motor causes the engaging member to rotate. The torque transducer senses the torque and the torque reading transmitter sends the reading to an operator or controller which interrupts the power supply to the nut runner when a predetermined torque is reached.

Abstract: In an impact type clamping apparatus including a motor unit for generating a pulsatory driving torque, a main spindle driven by said pulsatory driving torque to rotate a fastening member, a detecting unit for detecting a pulsatory torque applied to the main spindle, a calculating circuit for calculating a clamping force in accordance with a peak value of the pulsatory torque, and a control unit for stopping the operation of said motor unit when the calculated clamping force exceeds a desired clamping force, said clamping force is calculated not only from the peak value of the pulsatory torque but also from an increasing coefficient which represents a relationship between the peak value of the pulsatory torque and an increment of the clamping force.

Abstract: The present invention relates to a torque limiting device for use in the affixation of a halo-type traction tool to the skull of a person. The torque limiting device has a shaft or shank embedded in a handle member which rotatably engages a skull pin during the fixation of a halo-type traction device to an individual. The torque limiting device has a first shear point at a reduced shank intermediate portion which prevents rotational torque forces in excess of a predetermined level from being applied to a skull pin during the attachment procedure of a medical cervical traction brace or tool. The present invention also includes a second shear point at the shank-handle interface which acts as a second safety mechanism to ensure that excessive pressure is not applied, and undesirable skull penetration does not occur, during the attachment procedure of a skull pin and halo to an individual's skull. The torque limiting device further includes a skull pin engaging end.

Abstract: An air impact tool has an air motor driving a rotary impact mechanism which has a drive shaft which is coupled to a coaxial load shaft through a torque-limiting clutch mechanism which includes a rigid torque member coupled to one of the shafts and having a peripheral drive surface with drive surface portions, and a yieldable torque member coupled to the other shaft. A plurality of flexible and resilient arms on the yieldable torque member are equiangularly spaced apart around the axis of rotation parallel thereto and are cantilevered from a support yoke, the distal ends of the arms being respectively engaged with the drive surface portions of the torque receiving member. A retaining cylinder encircles the arms and holds them against the drive surface, the retaining cylinder being threadedly engaged with an adjusting member which is rotatable but axially fixed to effect axial movement of the retaining cylinder to vary the retaining force on the torque transmitting arms.

Abstract: A system and method for compensating for torque overshoot in a rotary power tool wherein the tool is shut off at an adjusted set point value of torque which is below the target value of torque by the amount of torque overshoot. While the tool is operated to perform a fastening job, the relationship between the torque rate in the fastening job to overshoot in the tool is determined, the torque rate in the job is monitored while the tool is setting the job, and the torque set point is adjusted while the tool is setting the job to compensate for the torque overshoot determined from the foregoing relationship.

Abstract: A screw can be driven home in response to the application of a preselected torque by placing over the head of the screw a tubular first section of a plastic adapter wherein the first section is connected with a polygonal second section by a frangible joint. The joint breaks in response to the application of preselected torque to the second section, and the separated second section then exposes a destructible diaphragm which is provided in the first section and overlies the head of the screw. The head can be engaged by the working end of a tool in response to at least partial destruction of the diaphragm. The first section can be of one piece with the head or it can be affixed thereto by an adhesive or is in mere frictional engagement with the head.

Abstract: A tightening tool includes a hammer for impacting on an anvil which drives a nut etc. A microphone is provided for converting impact sounds of the hammer on the anvil into an electric signal. A counting device counts the number of pulses of the electric signal. A setting device is provided for setting a set number of impacts to be obtained. A switch device compares the counted number of pulses with the set number and stops a motor for driving the hammer when the number of pulses coincides with the set number.

Abstract: A tightening tool includes a hammer for impacting on an anvil which drives a nut etc. A microphone is provided for converting impact sounds of the hammer on the anvil into an electric signal. A counting device counts the number of pulses of the electric signal. A setting device is provided for setting a set number of impacts to be obtained. A switch device compares the counted number of pulses with the set number and stops a motor for driving the hammer when the number of pulses coincides with the set number.

Abstract: Magnetically controlled torque system or wrench for turning a fastener in a controlled manner until a variable and selectable maximum torque value is achieved whereupon the torque system is rendered inoperative, the maximum torque value being determined by the amount of force required to decouple a plunger from a magnetic field.

Abstract: A nut runner control system includes a plurality of nut runners, a plurality of subcontrollers connected to the nut runners, respectively, for controlling the nut runners, and a master controller connected to the subcontrollers for presetting and modifying drive conditions for the nut runners and for monitoring the nut runners based on data indicating operating conditions of the nut runners and received through the subcontrollers, respectively.

Abstract: A screw includes a socket adapted to receive the tip of a screwdriver. The socket is tapered and formed by a plurality of sides interconnected by rounded corners. Each side is configured as a surface of a segment of a cone having a cone angle of at least three degrees. The screwdriver tip is configured correspondingly to the screw socket. The screwdriver may be mounted in a power driven rotary arm and spring-biased, whereby a tightened screw applies a rearward reaction force to the screwdriver, causing the tip to be displaced from the screw socket and thereby limit the torque applied to the screw.

Abstract: The invention is directed to a toothbrush having a brush head 26 moved by an electromotive drive 12. It is suggested to arrange a mechanical torque limiting device 15 including a cam follower 13, 14 which is acted upon by a spring 16, 17 between a drive shaft of the electromotive drive 12 and the brush head 26. The user of the toothbrush and the electric motor 12 of the toothbrush are thereby protected against damage resulting from an improper manipulation of the toothbrush.

Abstract: A power wrench with torque control means, comprising a spring biassed torque limiting mechanism, wherein mark means indicating the actual length of the biassing spring (22) are visible from outside the tool housing (10) through one or more apertures (30, 38), and a gauge element (40) movably supported on the tool housing (10) and carrying two interspaced marks (42, 43) adapted to be aligned with the spring length indicating mark means in a nominal output torque setting of the torque limiting mechanism.

Abstract: A tool for the application of selected torque to the polygonal head of a bolt, to a nut or to an analogous component has a first portion which is a snug fit on the polygonal part of the component, and a polygonal second portion which can be engaged and rotated by a wrench. The material of the tool is more readily deformable than the material of the component and the material of the wrench so that the wrench deforms the second portion and/or the component deforms the first portion of the tool when the component offers a selected resistance to further rotation, i.e., in response to the application of a selected torque to the component. The first portion can be bonded or molded to the torque-receiving part of the component to be rotated, and the second portion can be coated with a film of a color different from that of the second portion to facilitate visual determination of the condition of the second portion.

Abstract: This torque wrench includes an operating lever, an output shaft rotatable with the operating lever, a one-way rotation restricting system that rotates a threaded part in only one direction, a torque measuring system for measuring clamping torque, a rotating parts group which rotates with an output shaft, a stationary parts group restricted for relative displacement with an object by means of clamping the object, a rotating angle measuring system for measuring a rotating angle toward the object and a measuring output system for outputting values measured by the rotating angle measuring system and the torque measuring system.

Abstract: A power wrench for two-step tightening of screw joints, has a housing (13), an electric motor (10) including a rotor (25), an output shaft (24) coupled to the rotor (25), and a power supply. The power supply includes a power converter (11) with a variable frequency and voltage output and a current responsive power shut-off device. A retardation responsive inertia device (28) is coupled to the motor rotor (25) via a spring (32) and a cam (29, 30) for corotation with the motor rotor (25) and for activation of a switch (12) as a certain predetermined retardation magnitude in the motor rotor (25) is exceeded. The latter is used for obtaining a fast torque interruption of the initial tightening step of the two-step tightening process, whereas the final tightening step is discontinued automatically as a predetermined current magnitude in the power supply is reached.

Abstract: A simplified torque signalling wrench in which the torque responsive means comprises a camming recess or notch in the outer end of a wrench shank within a handle for the wrench and to which the shank is pivoted to provide limited angular movement for the outermost end of the shank with a ball surface being yieldingly forced into the recess defined by walls of the recess by spring loading to maintain the shank along the centerline of the handle and yielding to camming forces under a torque load to effect relative angular movement of the shank and handle to signal a torque load in excess of a torque load determined by the adjustable loading of the spring.

Abstract: A power driven screwdriver includes a driving mechanism interposed between the drive motor and the spindle. The driving mechanism includes a first member rotatably mounted within the housing and a second member movably mounted to the first member and driven by the driver motor. A cam mechanism is interposed between the first member and the second member and is operable for transmitting rotation of the second member to the first member and for permitting the second member to move between a first position and a second position. The second member is movable from a first position to the second position as torque transmitted from the second member to the first member increases. A frictional clutch mechanism is interposed between the spindle and the first member for transmitting rotation of the first member to the spindle. A claw clutch mechanism is interposed between the spindle and the second member and is operable to be engaged when the second member is positioned at the second position.

Abstract: A hydraulic reaction device of a power steering apparatus includes a vehicle-speed responsive pump, a reaction plunger, a hydraulic reaction chamber, a path, and a variable control unit. The vehicle-speed responsive pump has a pressure oil discharge flow rate which changes in accordance with a vehicle speed. The reaction plunger selectively constraining relative pivotal displacement between input and output shafts constituting a rotary flow path switching valve of the power steering apparatus. The hydraulic reaction chamber receives the pressure oil from the pump to apply a reaction oil pressure to the reaction plunger. The path is arranged to connect the hydraulic reaction chamber to a tank. The variable control unit (a variable throttle portion 37 of a reaction oil pressure control valve 11) for variably controlling a flow rate of the pressure oil flowing through the path.

Abstract: Generally there is provided an improved design for a nutrunner appliance drive mechanism and strain gauge mounting. The design for the drive mechanism and strain gauge mounting of the nutrunner appliance facilitates placement of the strain gauge nearer the nut engagement extremity. The drive mechanism includes a shaft member mounted at an angle transverse to the motor shaft, and having a beveled gear at one extremity and a nut engaging member on the other extremity. A strain gauge is mounted between these extremities and provides signals to contacts rotating with the shaft. A brush contact protruding from a removable terminal block is used to pick up the electrical signals from the strain gauge contacts.

Abstract: A reversible powered impact wrench is provided wherein improvements are incorporated in the detenting of the reverse direction valve, venting of excessive air pressure within the impact wrench motor housing which may use light weight material due to improved clutch and camming means and wherein an improved one piece anvil-timing shaft is designed to be supported by the impact wrench hammer and rotor.

Abstract: An electric wrench includes a motor, an electromagnetically controlled clutch comprising electromagnet members and temporary-magnetizable members, a centrifugal control switch to de-energize the electromagnet members when the drive shaft connected to the motor spins at a predetermined rate of rotation and to energize the electromagnet members when the drive shaft spins slower than the predetermined rate of rotation, and a centrifugal swinging device for actuating the centrifugal controlled switch.

Abstract: A jaw assembly for apparatus for gripping pipes, the apparatus being of the type having automatic means for exerting increased gripping force upon application thereto, is provided with a member having a concave surface which cooperates with a gripped pipe to override the automatic means for exerting increased gripping force. Having such a member, the jaw assembly of the present invention can exert a predetermined maximum gripping force on a gripped pipe notwithstanding amount of torque applied to the apparatus. Considering angular relationships involving jaw cam angle, the present invention can be manifested in an increasing cam angle jaw for power tongs.

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 power driven rotary tool includes a tool housing and an electric motor mounted within the tool housing. A first clutch member is operatively connected to the electric motor. A spindle is rotatably mounted in the tool housing and has a tool bit removably secured to the front end thereof. A second clutch member is operatively connected to the spindle and is shiftable between a first position in which the second clutch member is in driving engagement with the first clutch member and a second position in which the second clutch member is in sliding engagement with the first clutch member. A biasing mechanism is provided for normally biasing the second clutch member into driving engagement with the first clutch member. A control mechanism is disposed in the tool housing for steplessly adjusting the biasing force of the biasing mechanism. A manually-adjustable operating mechanism is provided for operating the control mechanism from outside of the tool.

Abstract: When tensioning a gasketed joint, the drive system applies rotational force to a threaded fastener while the monitor and control unit continuously compares a torque-related variable to a shutoff point. When the shutoff point is reached the control system reduces the drive system power, preferably to zero. After a preselected time pause the drive system is re-energized and applies another torque application until the torque-related variable again reaches the shutoff point. When the gasket is adequately compressed so that further torque applications cause insignificant increases in gasket compression, the tensioning operation is terminated. Feedback is provided by tension-related variables such as incremental angle of turn and/or incremental elapsed time of the torque application to determine when the tensioning cycle is complete.

Abstract: The wrench is for use with a bolt having an axial bore in which is located a pin. The pin is rotatable within the bore until the bolt is tensioned near its elastic limit, at which point rotation of the pin relative to the bolt is restrained.The wrench includes a body (12) drivingly carrying via dogs (20) a first socket (16) for engaging and driving a nut on the bolt. A second socket (28) engages a head on the pin. The first and second sockets (16,28) are connected to a common drive, the connection of the second socket (28) being in a coupling in which a pin (46) engages in a detent in a cam cylinder (50).When rotation of the pin relative to the bolt becomes restrain bed, the coupling (46,50) disengages, allowing the cam cylinder (50) to be urged outwardly of the housing (12) by a spring (60), to cause a warning indicator (58) to be displayed.

Abstract: Device for locating the ideal screwing position of bolts of large dimensions wherein a bolt (10) is lowered under control until it engages in the tapping recess of an orifice (5), the bolt (10) is rotated in the opposite direction to screwing, the point of engagement of the threads (11) of the bolt (10) in the threads of the tapped orifice (5) is detected, screwing is started under control by the rotation of the bolt in the normal direction, successive seizures are detected during the screwing, and after each seizure the ideal screwing position is located by means of a suitable path from the center corresponding to the preceding stop previously recorded, screwing is resumed after each detection of the new ideal screwing center, and the screwing of the bolt (10) is continued at a high speed until the end of screwing is detected.

Abstract: Hydraulic tongs, used to screw oilfield tubulars together, are equipped with torque control means which enable the tongs to rotate the tubulars and then gradually apply torque until a preselected torque value is reached, hold the torque at this value a desired period of time and then release the torque. In one form of the invention, a tong control restricts the power of the tong motor to enable low torque rotation while limiting the maximum torque which can be produced by the tong motor. A hydraulic cylinder placed in the tongs' restraining line is controlled to shorten, hold or extend the line. When the line is shortened, the tongs are pulled in a direction which increases the torque to a value above the maximum torque produced by the tong motor. The system allows heavy, powerful tongs to be used to accurately apply and hold a wide variety of selected torque values.

Abstract: The fastener driving tool of an automatic assembly machine is rotated by a two speed transmission which acts in conjunction with two torque-responsive clutches. Initially, the transmission rotates the driving tool at a high speed to effect fast driving of the fastener. After torque of predetermined magnitude has been applied to the fastener, one of the clutches torques out and, at that time, the transmission rotates the driving tool at a greatly reduced speed by way of the other clutch so that the fastener is rotated slowly during final tightening. When final tightening torque of predetermined magnitude is applied to the fastener, the second clutch torques out to stop rotation of the driving tool.

Abstract: A differential gear mechanism is mounted within a gear case fixed to a housing, an intermediate gear and a clutch mechanism are disposed on at least one output side, and a rotation changes for changing over the rotation of both output shafts between synchronous rotation and independent rotation according to increase or decrease in load relative to a present torque value.

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: Apparatus and a method are presented for determining the torque load applied to a fastening element by a fluid powered wrench, and displaying a digital readout of the torque. The operating pressure of the wrench, after compensation for the temperature of the pressure transducer, is converted to a torque measurement by a programmed microprocessor and the torque value is displayed on a digital readout. The system is useable with and adjusts for wrenches of several sizes by an input selector switch connected to the microprocessor. Apparatus and method are also presented for automatic cycling of a ratcheting hydraulic powered wrench and automatic termination of the tightening process when a predetermined torque has been delivered to the fastening element.

Abstract: This invention relates to a method of controlling torque in an electric motor driven connector applicator which applies a desired torque to a twist-on wire connector and a plurality of wire ends positioned within the connector. A desired level of torque is first determined by the connector applicator operator. The torque applied by the connector applicator as it turns a wire connector about the wire ends positioned therein is monitored until the desired level of torque has been reached. The connector applicator is stopped and then rotated in a reverse direction to release the connector held therein.

Abstract: An air wrench, with a compressed air motor, a wrench head and a gearing for transferring the power of the motor to the head, as well as a control mechanism, which comprises at least one adjustable pressure reducer for limiting the torque and which permits the wrench to be switched on and off manually by opening and closing a main air valve in the compressed air line to the motor of the wrench.

Abstract: A torque wrench comprising an Allen wrench, a read-out member and a holder member for securing the dial to the Allen wrench. Bending of a portion of the wrench, as measured by the read-out member, is indicative of applied torque.

Abstract: An apparatus and method for assembly and disassembly of interchangeable surgical acoustic members includes a fixture for securing by a key a handpiece to which a tip and/or extender is attached. A torquing wrench has a tightening head and an untightening head on the same body, wherein the tightening head permits torquing of the tip and/or extender to a predetermined tightening torque in cooperation with a socket having a central bore therethrough so that the wrench and socket may be slid over an axially elongated combination and used at a point intermediate along the length thereof. In use, the handpiece is secured in the handpiece fixture and receives the tip and/or extender in a handtightened condition to be torqued to a predetermined limit by the torquing wrench while secured against rotation in the handpiece fixture. A table support structure for supporting a handpiece fixture for an alternative operation is also disclosed.

Abstract: A power-wrench bolting spindle (1) is used to insert and tighten screws or nuts. The bolting spindle is driven at one end by a motor through a reduction gear (5) and at its other end a bolting tool is seated. A torque sensor (7) is mounted between the motor and the spindle. During bolting, other essential data besides the bolting torque are ascertained. The bolting spindle is equipped with a depth sensor (24) connected to the regulating circuit to measure the depth of bolting. An angular-speed sensor is connected to the regulating circuit and measures the motor or spindle angular speed. The bolting procedure is carried out in two operational stages separated by a pause, namely an application stage (L) and a tightening stage (Z). Each of these operational stages terminates when a specific shutdown bolting torque is reached.

Abstract: Apparatus and a method are presented for determining the torque load applied to a fastening element by a fluid powered wrench, and displaying a digital readout of the torque. The operating pressure of the wrench, after compensation for the temperature of the pressure transducer, is converted to a torque measurement by a programmed microprocessor and the torque value is displayed on a digital readout. The system is useable with and adjusts for wrenches of several sizes by an input selector switch connected to the microprocessor. Apparatus and method are also presented for automatic cycling of a ratcheting hydraulic powered wrench and automatic termination of the tightening process when a predetermined torque has been delivered to the fastening element.

Abstract: A screwing spindle (1) is mounted on a frame so as to be capable of rotating about its own axis, and also to be capable of up and down movement along its axis. The spindle is rotated by a drive gear (26) via an intermediate gear (24) which is mounted on a shaft (31) which is in turn mounted on a moving support (33) which is resiliently urged towards a rest position by return means (39). The wrench device also includes detector means (45) for detecting movement of said moving support (33). When a desired torque has been reached, the moving support (33) is driven away from its rest position by said drive gear (26), and said movement is detected by said detector means (45), which are arranged to then release the jaws of the spindle.

Abstract: A marking device for automatic marking of threaded joints tightened by a pneumatic power wrench, wherein a marking liquid container (48), a metering pump (37), a pressure air supply valve (31) and a marking liquid outlet passage (55) form a unit detachably clamped onto the power wrench housing (10). Pressure air communication passages (24, 25) feed the marking device directly with pressure air from the air supply passage (13) of the power wrench. The marking liquid container (48) comprises a replaceable collapsible tube which is pressurized all around in a pressure air supplied chamber (28). The single stroke metering pump (37) delivers for each stroke a well defined quantity of marking liquid to the outlet passage (55) which is formed by a fine hose made of plastic material with non-adhesive properties relative to the marking liquid. A pressure air operated feed valve (62) is arranged to prevent back flow and other uncontrolled flow of marking liquid through the outlet hose (55) by compressing the latter.

Abstract: A system and apparatus for the monitoring and control of torque applied during make-up and breakout of drill string components. The force applied by the cat head to the tong is measured by a hydraulic load cell and the horizontal and vertical angles between the direction of the cat head pull and the longitudinal axis of the tong are measured by angle measuring devices. Force and angle values are used for calculating the correct value of the applied make-up or breakout torque. Force angle, and torque values at shut down or breakout may be displayed, printed and plotted. During make-up, the cat head is automatically disengaged at an instant calculated to achieve a desired make-up torque at the completion of shut down.

Abstract: A hand operated crimping tool comprising a crimping head 10 and a pair of operating handles 12 for actuating said crimping head. At least one of said handles includes a force sensing arrangement including detent mechanism for maintaining handle portions 80, 88 in an unloaded position until a predetermined crimping force is applied by the crimping head whereupon the detent mechanism releases to allow slight, relative pivotal motion between the handle portions. The detent arrangement includes a tapered extension post 90 defining a recess 100 and a grip 80 pivotally connected to the post. The grip slidably mounts a spring biased slider 98 which defines a recess, confrontingly aligned with the recess in the tapered post when the grip and extension are in an unloaded position. A detent ball 94 is captured between the confronting recesses. The force exerted by the slider on the detent ball resists pivotal movement between the grip and the extension.