Abstract: According to a bolt tightening method and a bolt tightening apparatus of the invention, a bolt is tightened by using a bolt tightening device, in which torque gradients expressed in terms of the ratio of a tightening torque exerted on the bolt to its turning angle are calculated by successively detecting the tightening torque at intervals of a specific bolt turning angle and calculating an average of individual torque gradient values by first and second torque gradient calculators, and the amount of tightening of the bolt is controlled by a tightening amount controller based on the average of the individual torque gradient values calculated.

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: In a power impact tool for fastening a fastening member, a torque for fastening the fastening member can be estimated without using a high-resolution sensor and a high-speed processor.

Abstract: There is provided a magnetic impact tool comprising a magnetic hammer driven by a motor, a magnetic anvil disposed so as to face the magnetic hammer, an output shaft that rotates together with the magnetic anvil, a magnetic bypass device for distributing magnetic flux between the magnetic anvil and the magnetic hammer, and a changing device for changing the distribution of magnetic flux with the magnetic bypass device, wherein a rotational impact force is magnetically generated in a non-contact manner for the magnetic anvil in conjunction with the rotation of the magnetic hammer. The torque generated between the magnetic hammer and magnetic anvil can be changed by varying the distribution ratio of the magnetic flux from the magnetic hammer to the magnetic anvil and magnetic bypass device by the changing device. Impact action can be generated, and screw tightening and loosening work can be carried out even if a low-torque motor is used.

Abstract: A system and method for unidirectionally or bi-directionally communicating information and data to and from an electronic module housed within a cordless power tool, over power terminals of the cordless power tool, while a battery pack of the tool is removed from the tool. A data transfer device is connected to at least one power terminal of the tool in place of the battery pack. The power terminal is also used for electrically connecting the battery pack to the tool during normal operation of the tool. A voltage supplied by the data transfer device to the tool is sequentially varied between a first level and a second level, in accordance with a predetermined communications protocol, to transmit data from electronic module of the tool to the data transfer device. A voltage signal applied to the electronic module of the tool is sequentially shifted between a first voltage and a second voltage to transmit data from the data transfer device to the tool.

Abstract: An impact tool having a control system for turning off a motor at a preselected torque level.

Abstract: Disclosed is an optimizing method for regulating the operating state of a guided machine tool having a tool rotating at a certain speed and subjected to a percussion frequency during a boring action, in which the tool, subjected in addition to a force, is driven into an object of a given material.

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: An impact tool having a control system for turning off a motor at a preselected torque level.

Abstract: A hand-held power tool includes a torque cut-off device (2) for presetting a torque of the driving shaft (3) of the hand-held power tool and formed as a control device (4) having a rotatable control sleeve (5) including a control cam (6) having at least two cam sections (6a, 6b), and a control element (7) secured in the housing (1) of the power tool without a possibility of rotation but with a possibility of an axial displacement relative to a rotational axis (D) of the control sleeve (5) and having at least two probing sections (8a, 8b) cooperating with respective cam sections (6a, 6b) for presetting the torque.

Abstract: The invention is based on a hand power tool, in particular a drill hammer and/or a chipping hammer, having a striking mechanism (14) capable of being driven in a housing (10) by an electric motor (12), via which an insertable tool (18) situated in a tool mount (16) is capable of being driven in an impacting manner, and having a sensor unit (30) via which a characteristic value for a no-load position can be detected. It is proposed that, when a no-load position is detected via a motor control unit (22), the electric motor (12) and, therefore, the striking mechanism (14) can be actively decelerated.

Abstract: An impact wrench (1) comprising an output shaft (5) for receiving a socket or other fastener engaging element for tightening a fastener is powered by a pneumatic motor (11). Apparatus (20) for determining when the fastener has been tightened to a predetermined tightness comprises a body member (21) extending around the output shaft (5), and an eccentrically disposed member (24) on the output shaft (5) located within a central bore (30) of the body member (21). A pair of photo sensors (33a, 33b) in light accommodating bores (34a, 34b) receive light through the bores (34a, 34b) from corresponding light emitting diodes (36a, 36b).

Abstract: A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck. The control circuit for the power tool is operable in a ratcheting or pulse mode that causes the output spindle to rotate in discrete incremental amounts. Corresponding methods for controlling the operation of the electric motor of a power tool are also disclosed.

Abstract: A control process for an at least partially axially hammering and rotating electric hand-held machine tool (1) in which an electromagnetic clutch (4) arranged in the flow of force between an electric motor (2) and a tool receptacle (3) is controllably connected to computing means (5) connected to sensors (6a, 6b, 6c), wherein the clutch (4) is repeatedly alternately opened and closed in at least one process step controlled by the computing means (5).

Abstract: In a hand-guided percussion drilling machine an arresting coupling non-rotatably coupling a drilling spindle relative to a machine housing is arranged on an intermediate shaft rotatably connected with the drilling spindle and extending parallel to and at a radial distance from the drilling spindle and at a radial distance from the motor shaft, wherein the arresting coupling openings during a torque transmission from a drive motor to a tool holder in one direction and closes during a torque transmission from the tool holder in an opposite direction.

Abstract: A power wrench for detecting the attainment of a target torque level in a screw joint tightening process is provided, wherein an override type torque responsive release clutch is used in the power wrench for defining the target torque level. A microphone is mounted in the power wrench for recording “click” sound(s) developed in the clutch during the release movement of the clutch, and a control unit including a signal identifying device is provided for recognizing the release “click” sound(s) and delivering a stop signal for interrupting the power supply to the motor and/or braking the motor as the clutch is released and the target torque level is achieved.

Abstract: A control device for use with pneumatic tools includes a torque limiting timing device and pressure regulator, thereby improving on the accuracy of torque ultimately applied to workpieces. Pneumatic tool with a housing and motor with a control device that is in fluid communication with the tool's motor.

Abstract: A pneumatic percussive mechanism having an axially reciprocating percussive loaded percussion piston (2), wherein a non-contacting magnetic field sensitive sensor (3) is arranged radial thereto. The percussion piston (2) features at least externally ferromagnetic material and has a plurality of axially separated zones (4) of different magnetic permeability.

Abstract: Power tool (11) may include a motor and oil pulse unit (22) that generates an elevated torque. Oil pulse unit (22) may be coupled to the motor and have output shaft (18). When load acting on output shaft (18) is less than a predetermined value, rotating torque generated by the motor is directly transmitted to output shaft (18). When the load acting on output shaft (22) exceeds the predetermined value, an elevated torque is generated by oil pulse unit (22) and applied to output shaft (18). Output shaft (18) may be connected to load shaft (12). A socket may be attached to the distal end of load shaft (12). Power tool (11) may further include detecting device (20) for detecting change in rotational angle of output shaft (18) and the direction of rotation thereof, and a control device. The detecting device (20) may output signals corresponding to a state of output shaft (18) to the control device. The control device may store the state of output shaft (18) at predetermined interval.

Abstract: The present invention relates to a signal processing and control device for a power torque tool. The signal processing and control device is adapted to be removably engageable with the body of said power torque tool, to be operable to process pulse signals representing pulses of torque being received from a torque sensor adaptor of the power torque tool in order to provide a shut-off signal to the power torque tool dependent on the received pulse signals, and to be powered by the power supply of the power torque tool.

Abstract: A method is provided for determining the optimum control parameter values for a screw joint tightening process carried out by a power wrench which is controlled by a programmable control system utilizing the determined parameter values. The control system is provided with screw joint tightening characteristic parameter values and operation parameter values characteristic of the actually used power wrench. The tightening process is mathematically simulated by using the screw joint and power wrench characteristic parameter values as well as pre-chosen operation control parameter values. And the result of the simulated tightening process is evaluated in view of predetermined evaluation criteria, thereby determining the suitable operation control parameter values to be used during production tightening of the actual type of screw joint.

Abstract: An air cylinder is connected to a centrifugal mesh clutch mechanism connected to an air motor. A driver bit is mounted to a front face of a piston of the air cylinder. A hexagonal shaft is mounted to a rear face thereof and the hexagonal shaft is fitted to a hexagonal hole formed at an anvil of the centrifugal mesh clutch mechanism. A hole having a diameter larger than that of the hexagonal shaft is formed at center of a rotor of the air motor to thereby enable to freely lift the piston and the driver bit in the air cylinder. By simultaneously driving the air motor and the air cylinder by pressurized air, the hexagonal shaft, the piston and the driver bit advance while rotating integrally to thereby fasten a screw.

Abstract: The present invention is directed towards a method and an apparatus for accurately estimating the tension or clamp force in a bolted joint. An installed fastener is rotated and the torque necessary to rotate the fastener and the angle through which the fastener is rotated are measured. The angle and torque values are plotted against one another such that the angle values are plotted on an angle axis and the torque values are plotted on a torque axis. A tangent is extended from the plot towards the angle axis. The point at which the tangent crosses the angle axis is defined as zero degrees and is called the “elastic origin”. The known angle through which the fastener rotates is used to scale the angle axis. The angle from the elastic origin to the point at which the tangent was drawn is defined as the M-alpha angle and is directly proportional to the clamp force created by the bolted joint or tension in the fastener.

Abstract: The invention is based on a power tool, in particular a hand power tool, with a drive motor (12) disposed in a housing (10) and at least one adjusting device (14, 16), which can be used to durably set at least one parameter of the drive motor (12) and/or of a transmission during an operating phase.

Abstract: A drill/driver is provided that includes a housing, a collar mounted at a front portion of the housing, a side handle mounting area provided forward of the collar, a handle mounted to the side handle mounting area, and a chuck mounted forward of the side handle mounting area. With the side handle mounted in front of the collar, easier access to the adjusting collar and easier reading of the collar settings is achieved.

Abstract: An impact tool control method and apparatus and an impact tool using the same. Pulses of torque applied to a fastener by the impact tool are measured. The duration and magnitude of the torque pulse are subtracted from a torque signal and the resulting difference is integrated over time to obtain a fastener angular velocity signal. The angular velocity signal is integrated over time to obtain a displacement signal which can be converted to a torque signal. The impact tool can be controlled based on the value of the torque signal.

Abstract: An impact tool control method and apparatus and an impact tool using the same. Pulses of torque applied to a fastener by the impact tool are measured. The duration and magnitude of the torque pulse are subtracted from a torque signal and the resulting difference is integrated over time to obtain a fastener angular velocity signal. The angular velocity signal is integrated over time to obtain a displacement signal which can be converted to a torque signal. The impact tool can be controlled based on the value of the torque signal.

Abstract: A multifunction handheld tool machine having an at least partially axially percussive tool receptacle (7), a safety coupling (8) disposed in the power line between the tool receptacle and an electrical motor (6), a hand-guided housing and an ATC safety module (1) with a rotational sensor (3) sensitive to an angular displacement. The ATC safety module (1) is connected to an axial displacement sensor (4) and, in the event of exceeding an axial limit value (13b), the binary control signal (5) is suppressed by the axial displacement.

Abstract: An output shaft locking device includes a hollow frame through which an output shaft extends. The output shaft has a polygonal end which is connected to a driving device. A locking device includes a fixed ring received in an underside of the hollow frame and an inner ring is rotatably received in the fixed ring. A first polygonal hole is defined through the inner ring and recesses are defined in an underside of the inner ring. The driving device has a driving disk and a second polygonal hole is defined through the driving disk so that the polygonal end of the output shaft engages the two polygonal holes. A plurality of protrusions is formed on a top of the driving disk and matches the recesses in the underside of the inner ring. Gaps are defined between the polygonal end and the two polygonal holes. When the driving device does not provide power to the output shaft, the output shaft is locked by the locking device.

Abstract: An electrical hand-held power tool including a pinion (4) for driving a gear set that transmits a rotational movement to a power tool spindle, a pinion shaft (10) for supporting the pinion (4), an electric motor (2) for generating a torque, a rotor shaft (11) connected with the electric motor (2) for transmitting the torque to the pinion shaft (10), and a safety clutch (5) provided between the pinion shaft (10) and the rotor shaft (11), with the pinion shaft being formed as a hollow shaft provided in its interior with inner bearing which rotatably supports the pinion shaft (10), and with the rotor shaft (10) having its end received in the interior of the pinion shaft (10) and supported against the inner bearing.

Abstract: The fastening tool process controller provides an apparatus and process for programming, controlling, and comparison validation of the semi-automated operation of a transducer equipped and/or non-instrumented, pneumatically driven impulse or impact tool to a repeatable final shutdown torque value. The controller is taught a supply line pressure to output torque ratio for the particular pneumatic tool being used by validation against a NIST traceable standard torque transducer, or through manual checking with a normal torque wrench. This process is referred to as an automatic or manual teach cycle. The ratio provides the controller with the final required line pressure needed to achieve the pre-program torque targeted value. During a learn cycle, the micro-processor of the controller monitors values, either pressure differentials or acoustic signals, corresponding to mass air flow consumed while tightening a sample bolt into the actual application to the previous set torque target value.

Abstract: Power tool (1) may include a drive source (22). A device for generating an elevated torque, such as a hammer (4) and anvil (2), may be operably coupled to the drive source. Further, a trigger switch (48) may energize the drive source. Preferably, a sensor (30) detects when the hammer has begun to strike the anvil and generate the elevated torque. A control device (38) communicates with the sensor, the trigger switch and the drive source. Preferably, the control device may control the drive source according to either a measurement mode or an automatic stop mode. In the measurement mode, the control device preferably activates the drive source when the trigger switch is switched from the OFF position to the ON position, and stop the drive source when the trigger switch is switched from the ON position to the OFF position.

Abstract: A hand-held rotary-percussion power tool includes an electrical drive (2) for generating a torque transmittable to a boring tool used with the power tool for forming blind bores, a hammer mechanism (3) for applying impacts to the boring tool, control device (7, 7′, 7″) for controlling operation of at least one of the electrical drive (2) and the hammer mechanism (3), and an electronic depth stop (4). The depth stop include a sensor (5) for contactless, distance measuring of a depth of a blind bore, and a computation unit (6) for generating a signal indicating that a sensed measurement value (M) corresponds to a set value of the depth of the blind bore, and connected with the control device (7, 7′, 7″).

Abstract: It is an object of the present invention to overcome various drawbacks of a conventional oil pulse wrench by using an electric motor, to reduce a reaction force and to fasten a screw with high precision. To achieve the object, the invention provides a control method of a screw fastening apparatus using an electric motor as a rotation driving source, the method comprising the steps of; intermittently supplying current pulse DP to the motor, detecting an actual torque at predetermined time intervals, maintaining a current value when a detected torque value does not exceed a maximum value of past detected torques value and increasing the current value by a predetermined amount when the detected torque value exceeds the maximum value of the past detected torque value, and stopping the supply of the current pulse DP when the detected torque value reaches a target value TQJ.

Abstract: A power nut runner with a torque responsive shut-off capacity includes a housing (11,12,13), and a rotation motor (10) connected to an output shaft (28) via a torque responsive release clutch (26) in which torque is transferred via a cam mechanism (31, 35, 36) between a driving clutch half (25) and a driven clutch half (27, 30, 39). A spring (32) is arranged to bias and displace a first one of the clutch halves (27, 30, 39) towards the other in an engagement direction, and a signal emitting release detecting sensor (46), is provided in the housing (11, 12, 13). An activation element (40) is arranged to be thrown off an abutting contact with the spring biassed clutch half (27, 30, 39) to reach an active position beyond its inactive low torque position as the spring biassed clutch half (27, 30, 39) is abruptly returned to its engagement position after an axial release movement.

Abstract: An automatic shutoff mechanism for a pneumatic tool having an air motor, a pressurized airflow path to the motor and a torquing mechanism driven by the motor, includes a valve member moveable between open and closed positions relative to the airflow path and biased to the open position, and a trip apparatus responsive to application of a predetermined torque for moving the valve member to a trip position disposed in the airflow path sufficiently to expose the valve member to the pressurized airflow for driving the valve member from the trip position to the closed position. Mechanical and electromechanical embodiments are disclosed.

Abstract: An impact tool control method and apparatus and an impact tool using the same. Pulses of torque applied to a fastener by the impact tool are measured. The duration and magnitude of the torque pulse are subtracted from a torque signal and the resulting difference is integrated over time to obtain a fastener angular velocity signal. The angular velocity signal is integrated over time to obtain a displacement signal which can be converted to a torque signal. The impact tool can be controlled based on the value of the torque signal.

Abstract: A hand tool with an adjustable rotational speed and torsion force includes a shaft rotatably received in a body of the hand tool and driven by a motor that is mounted in the body. A first planet gear set is longitudinally connected to one end of the shaft opposite to the motor and a second planet gear set is longitudinally connected to the first planet gear set. The shaft is longitudinally movable in the body. The hand tool only has the first planet gear set acted thereon when the shaft is pushed toward the second planet gear set. The first planet gear set and the second planet gear set are acted on the hand tool at the same time when the shaft is pulled.

Abstract: An impact device has a carrier, a hammer, a pivot pin, two hammer pins and an output axle. The carrier has a bridge and two walls. Two depressions are defined in the bridge. An elongated hole is defined each wall. The hammer is pivotally mounted in the carrier through the pivot pin. Two legs respectively extend from the hammer to define a recess with an opening. A cavity is defined in each respective leg and corresponds to one of the depressions. An impact protrusion is formed on each respective leg to narrow the opening of the recess. Each hammer pin is moveably received in one of the depressions and the corresponding cavity. The output axle has a jaw selectively abutting against one of the impact protrusions on the hammer. Accordingly, an impact device with a durable structure is provided.

Abstract: Cable bolt wedge barrel, installation apparatus and method, for cable bolt installation in a mine borehole provided an interior resin system, wherein the wedge barrel of the cable bolt employed, and the tool used to revolve and supply thrust to the same, are mutually designed for (1) mutual, operative, wall-friction and/or end-detent drive engagement within a given torque range for the resin system employed, as applied by said tool, and (2) operative slippage when said range is exceeded, thereby precluding the emergence of the undesirable condition of over-mixing the resin system present in said borehole and consequent diminution of the resin system's holding power relative to the cable bolt within the borehole.

Abstract: A rotary motor driven tool comprising a motor, and a driven part, the motor being adapted to rotate the driven part, and a torque limiting device adapted to limit torque output of the driven part to a maximum output torque magnitude, wherein the tool further includes a switching apparatus which operates automatically to initiate switching of the maximum output torque set by the torque limiting device from a first lower magnitude to a second higher magnitude when a predetermined threshold is reached.

Abstract: A hand-held electrical appliance (1) for personal care or for use as an electric tool, has a housing (2), manual actuating means (3), at least one force sensor (9) located in or on the housing (2) for supplying a sensor signal representative of the grip force exerted by the hand of a user, and control means for controlling at least one operational parameter of the appliance (1) in response to the sensor signal. In this way the user can consciously or unconsciously influence the motor speed or the spring load of the shaving heads of an electric shaver, or the motor speed of an electric drill.

Abstract: Power tools (1) may include a drive source (22). A device for generating an elevated torque, such as a hammer (4) and anvil (2), may be operably coupled to the drive source. Preferably, a sensor (30) detects when the hammer has begun to strike the anvil and generate the elevated torque. A control device (38) communicates with the sensor and the drive source and communicates signals to the control device when the hammer has begun to strike the anvil and generate the elevated torque. Preferably, the control device determines whether the when the hammer has begun to strike the anvil and generate the elevated torque either (1) before a fastener has reached a seated position against a workpiece or (2) after the fastener has reached the seated position against the workpiece. Thereafter, the control device only controls the operation the drive source based upon signals generated by the sensor after the fastener has reached the seated position against the workpiece.

Abstract: It is an object of the invention to provide work control system that can prevent an interference of the transmitting signals of the power tools in relation to the work progress. A representative work control system according to the present teachings may include a plurality of power tools and detecting device. Each of the power tools may transmit signals relating to the work progress. The detecting device may detect the work progress of each of the power tools by receiving and detecting the signals transmitted from the respective power tools. The signals relating to the work progress may be transmitted from each power tool several times. Preferably, the transmission intervals may vary among the power tools in order to prevent the signals from being confused.

Abstract: A pneumatic tool apparatus, a pneumatic tool, and a method of making and using a pneumatic tool apparatus is disclosed. The apparatus has an inner torsion bar and an outer tube which has recesses which allow the apparatus to provide more torque in one direction of rotation than in the other direction of rotation.

Abstract: An impact tool having a control system for turning off a motor at a preselected torque level.

Abstract: An impact tool having a control system for turning off a motor at a preselected torque level.

Abstract: The present invention relates to a powered screw driver having a spindle 20 that is caused to rotate by an electric motor 10 within a range of about 5000 rpm (revolutions per minute) to about 7000 rpm (revolution per minute) when the spindle 20 idles. Because the spindle 20 rotates at a high revolution speed, the screw-fastening operation can more quickly be completed when the user of the screw driver 1 fastens the screw in a normal posture. The screw driver 1 may used to fasten screws having a pitch within a range of about 1.3 mm to 2.0 mm (i.e. about {fraction (1/32)} inch to {fraction (3/32)} inch).

Abstract: A control system for driving a power tool is provided comprising a power source, a motor adapted to drive a shaft, a power switching unit interconnecting the power source and the motor, and a controller. The power switching unit applying a pulse width modulated (PWM) drive signal from the power source to the motor. The controller monitoring at least one electrical characteristic of at least one of the power source, motor and power switching unit and adjusting the operating duty cycle of the PWM drive signal based on the electrical characteristics.

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.