Abstract: A method for determining the angular displacement of the output shaft (?0) of an impulse nut runner at tightening a screw joint to a predetermined final torque level (Tf) by an impulse nut runner having a motor driven impulse unit (23) with an inertia drive member (27), an output shaft (24) to be coupled to the screw joint to be tightened and an angle sensing device (35, 38) associated with the drive member (27) and arranged to deliver signals in response to the rotational movement of the drive member (27), wherein the total angular displacement of the output shaft (24) in relation to a threshold torque level (Tt) is calculated as a difference between the total angular displacement (?Dtot) of the drive member (27) as a result of a total number of delivered impulses (Ntot) and the angle of the total number of full revolutions minus one full revolution ? (Ntot?1)·360).

Abstract: An improved method is provided for controlling a power tool having a rotary shaft. The method includes: disposing an inertial mass in a housing of the power tool, such that the inertial mass is freely rotatable about an axis of rotation which is axially aligned with the rotary shaft; monitoring rotational motion of the power tool in relation to the inertial mass during operation of the power tool; and activating a protective operation based on the rotational motion of the power tool in relation to the inertial mass.

Abstract: A power screwdriver is disclosed having a drive which is coupled via a clutch, disengaging as a function of torque, to a tool drive shaft for driving a tool. The screwdriver comprises an electronic control unit for controlling the drive, and a sensor which is coupled to the electronic control unit in order to switch off the drive when the clutch responds. The electronic control unit is designed for activating the drive with a certain output, preferably with a reduced output, for a limited time after switch-off.

Abstract: A resource manager (14, 16) of a content management system (10) is configured to receive a client request (34, 36) pertaining to information and to access at least one of a plurality of data servers (20, 22, 24, 26) to execute the client request (34, 36). An encryption engine (80) encrypts passwords associated with the plurality of data servers (20, 22, 24, 26) using a key-based encryption algorithm and stores a ciphertext corresponding to each password in a passwords storage (40). A server identifier module (70, 72) identifies a ciphertext in the passwords storage (40) that is associated with the at least one of a plurality of data servers (20, 22, 24, 26). A decryption engine (100) decrypts the ciphertext using a key-based decryption algorithm corresponding to the key-based encryption algorithm.

Abstract: An intelligent tightening spindle comprises a drive output; a housing adapted to detachably mount to a moving platform of a multi-tool processing station, with the housing substantially enclosing: at least one electric drive motor having an associated servo amplifier; a gear unit operatively connecting the drive motor to the drive output; a spindle measurement transducer operative to monitor at least one of the drive motor, the gear unit, and the drive output; and a measurement data processing unit in communication with the spindle measurement transducer. An output signal port may have signals applied thereto representing measurement data that has been processed by the measurement data processing unit. The measurement transducer and/or the data processing unit may be removably coupled to the spindle via one or more electrical connectors. One or more of the tightening spindles may be used to form a multi-tool processing station.

Abstract: An electric motor-driven rotary tool with an elevated temperature detection function, provided by a temperature sensor, connected to a power shut off device, for shutting off power to the tool, in order to prevent injury, such as low temperature burn, from occurring to an operator of the tool, due to heating of the electric motor, encased in a housing having a holding part for the motor-driven rotary tool, causing an increase of the temperature of the housing, especially the holding part of the tool thereon, to a temperature capable of causing such burn injury to the operator of the tool.

Abstract: In a power impact tool for fastening a screw or a bolt, malfunction that driving of a motor is stopped before the screw or the bolt is fastened completely can be prevented. A fastening judger judged that the fastening operation is completed at least when a torque variation ratio becomes substantially zero and a reference index becomes equal to or larger than a threshold value of trouble judgment. The reference index is a number of impact of a hammer in a term in which the torque variation ratios take positive values, and the threshold value of trouble judgment is calculated with using a maximum value of the torque variation ratio in the term. Since the number of the impact of the hammer due to trouble in fastening operation is smaller than that due to the screw or the bolt is fastened completely, it is possible to distinguish the increase of the torque in the former case from the increase of the torque in the latter case.

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

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: An improved method is provided for controlling a power tool having a rotary shaft. The method includes: disposing an inertial mass in a housing of the power tool, such that the inertial mass is freely rotatable about an axis of rotation which is axially aligned with the rotary shaft; monitoring rotational motion of the power tool in relation to the inertial mass during operation of the power tool; and activating a protective operation based on the rotational motion of the power tool in relation to the inertial mass.

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: 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: An impact-driven rotating device includes an output shaft, a hammer for rotating the output shaft by imparting an impact to the output shaft, a rotation driver for rotating the hammer, an impact detector for detecting the impact imparted by the hammer, a rotation angle detector for detecting a rotation angle of the output shaft, a rotation speed detector for detecting a rotation speed of the output shaft from the rotation angle detected by the rotation angle detector, an energy calculator for calculating energy imparted to the output shaft from the rotation speed detected by the rotation speed detector, a between-impacts rotation angle calculator for calculating a rotation angle of the output shaft rotated from when the impact detector detected the impact to when the impact detector detects an subsequent impact from the rotation angle detected by the rotation angle detector, a tightening torque calculator for calculating a tightening torque by dividing the energy calculated by the energy calculator by the rot

Abstract: A basic method is provided for determining the installed torque in a screw joint which is being tightened by a series of repeated torque impulses, wherein the rotational movement of the screw joint is detected during each impulse, the point in which the screw joint ceases to rotate is detected. And the actually applied torque is indicated at the very instant the screw joint ceases to rotate. In a tightening process control application of the above described basic method, the per impulse increasing value of the installed torque is compared to a predetermined target value in a way known per se, and the tightening process is interrupted as the target value is reached. In a tightening process quality check application of the above described basic method, the accomplished angular displacements of the joint at repeated impulses are indicated and added, and high and low limit values for the final installed torque and the total angle of rotation are provided and compared to the actually obtained values.

Abstract: A process to more accurately determine torque output of power impact tools using impulse. Also disclosed are processes for controlling power impact tools, in particular a mechanical impact wrench, by determining the impulse of the tool impacts and deriving torque values therefrom. A mechanical impact wrench having an electronic control is also 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 power screwdriver has a drive unit and an input circuit for inputting screw size, material quality, pitch, and clamping length of a screw. An evaluation circuit is provided for determining a nominal prestress force based on input screw size, material quality, and clamping length, for determining a nominal torque based on the nominal prestress force and the pitch, and for determining the screw clamping angle resulting from the nominal prestress force and the pitch. A sensing device for sensing the actual torque is provided, and a further sensing device for sensing the actual screw clamping angle is present. A control and switch-off device controls further rotation of the drive unit when the actual torque coincides with the nominal torque and switches off the drive unit when the actual screw clamping angle coincides with the nominal screw clamping angle.

Abstract: A basic method is provided for determining the installed torque in a screw joint which is being tightened by a series of repeated torque impulses. The rotational movement of the screw joint is detected during each impulse. The point in which the screw joint ceases to rotate is detected. And the actually applied torque is indicated at the very instance the screw joint ceases to rotate. In a tightening process control application of the above described basic method, the per impulse increasing value of the installed torque is compared to a predetermined target value in a way known per se, and the tightening process is interrupted as the target value is reached. In a tightening process quality check application of the above described basic method, the accomplished angular displacements of the joint at repeated impulses are indicated and added, and high and low limit values for the final installed torque and the total angle of rotation are provided and compared to the actually obtained values.

Abstract: A cable connector for assembly and mounting on a front section of a housing of a power wrench is arranged to connect at least one operation parameter sensor of the power tool to a multi-core cable. The cable connector includes a multi-contact cable connector plug carried on the multi-core cable, and a one-piece mounting member which is made of an elastically resilient material and which is secured to the front section of the housing and supports a multi-contact jack. The multi-contact cable connector plug includes a coupling sleeve formed with an internal thread, and the mounting member includes an open ring portion to be mounted around the front section of the housing and a tubular coupling portion extending laterally from the ring portion.

Abstract: Disclosed is a low reaction oscillating mass-based torquing tool wherein an oscillating mass is excited into near resonant oscillation by reversing pulses resulting in increased energy stored in oscillation about a dual stiffness spring which develops a higher torque output with the stiffer spring action in the tightening direction and hence tightens the fastener.

Abstract: Disclosed is a low reaction oscillating mass-based torquing tool wherein an oscillating mass is excited into near resonant oscillation by reversing pulses resulting in increased oscillation about a torsion spring to the point where the torque associated with the energy stored in the torsion spring exceeds the torque required to further tighten a fastener and the torque released from the torsion spring tightens the fastener while a biasing torque assures application of the released torque in the tightening direction only.

Abstract: A hand-held machine tool has a housing having a wall provided with a duct, a motor arranged in the housing and having a gear unit with a spindle, a tool holder carried by the spindle, and an electric lead extending in the duct of the wall of the housing, the electric lead being fixed in the duct of the wall.

Abstract: An impulse wrench comprises a pneumatic rotation motor (12), a hydraulic torque impulse generator (13) provided with an impulse magnitude responsive actuator (17), a linear movement responsive electric signal producing device (25) located at the rear end of the motor (12), a movement transferring push rod (21) extending through an axial bore (22) in the motor rotor (16) and interconnecting the actuator (17) and the signal producing device (25), an electrically activated motive air shut-off valve (31) disposed concentrically with the signal producing device (25), and an external process controlling and monitoring unit (40) connected to the signal producing device (25) and the shut-off valve (31) and arranged to compute and compare received signals with predetermined values and to initiate shut-off of the power supply (31) as a desired tightening condition is reached.

Abstract: The present invention provides an impact wrench and a bolt-tightening method such that a spring force is applied, through the circumference of a spindle coupled with the output shaft of an electric motor, in the forward direction to a hammer which is capable of forward and rearward movement and rotational motion following the spindle. The hammer and an impact shaft are brought in coaxial mesh alignment by leaving a gap between them in the direction of rotation so that when a bolt to be tightened is inserted into a socket fixed to an end of the impact shaft to permit the bolt to be tightened, the mesh contact with the impact shaft is released as a result of the hammer being lifted up in the rearward direction against the reaction force due to the tightening of the bolt. An impact sensor detects release of the hammer from the impact shaft and an angle sensor measures the angle of rotation of the impact shaft.

Abstract: In order to prevent a looseness of bolts after main clamping, a nut runner of the present invention comprises a torque sensor for detecting a clamping torque T of a clamping unit, and a torque comparison means for comparing the clamping torque T with a clamping completion torque ST. The nut runner further includes a torque control means which gradually reduces a rotational torque of the motor until a resilience such as a torsion accumulated in the clamping unit is entirely nullified when the clamping torque T reaches the clamping completion torque ST. This ensures an effective cancellation of an inverse torque arising from the resilience and acting in the direction loosening the bolt, thus preventing the bolt from loosening.