Abstract: A test and calibration system of electronic torque wrench includes a base, a sensing device, a force imposing device, and a calibrating device. The sensing device is disposed on the first end of the base and includes a receiving socket to receive the driving portion of the wrench. The force imposing device is disposed on the second end of the base for holding the handle portion of the wrench, such that the wrench imposes the torque on the sensing device which measures the actual torque value. The calibrating device is signally connected with the sensing device and the wrench. When a predetermined torque value is different from the actual torque value, the calibrating device generates a calibrating signal to the electronic torque wrench for the calibration operation. Also, the calibrating device includes a displaying unit for displaying the actual torque value.

Abstract: A screwing machine includes a motor, an output shaft, a twist portion, a plate portion, a strain gauge, an amplification circuit. The output shaft is driven by the motor. To the output shaft, a bit is attachable. The twist portion is hollow. To the twist portion, torque applied to the output shaft is transmitted through a transmission element. The output shaft is configured to be indirectly twisted by the torque applied to the output shaft. The plate portion is integrally formed with the twist portion. The strain gauge is disposed on the twist portion. The amplification circuit is disposed on the plate portion. To the amplification circuit, a signal from the strain gauge is input.

Abstract: A torque wrench, including: a head region with a receiving opening; a bending-resistant shaft region adjoins the head region; a support formed on the shaft region; and an actuating lever including an elastically bendable portion and a handle. The receiving opening receives a screwing instrument and defines an axis of rotation. The actuating lever, in resting position, is spaced apart from the in the circumferential direction to the axis of rotation. If a screwing instrument is inserted into the opening, the actuating lever transmits a torque. The wrench has an indicator region, which the exerted torque can be read as a result of the deflection of the actuating lever. When a reference force is reached, the bending portion comes into contact with the support. When a force is applied, the bending portion can be in the tightening direction and the torque can be read in the region.

Abstract: Provided is a torque wrench, or Mechanical Torque Limiting Device (MTLD), that is configured to accurately indicate the torque applied thereby on the object (or vice versa). The measurement of the torque is carried out by incorporating a pressure sensitive material in a gripping portion that is associated with the body of the torque wrench. The pressure sensitive material is configured to exhibit a signal upon application of force thereof. The signal can be an electric-based, color-based, motion-based (vibrations) or audio-based indication.

Abstract: An electronic torque wrench (10) comprises a body with an axial extension along a longitudinal axis (11), a front end provided with a coupling (14) intended to engage the wrench on a joint to be tightened by manual rotation around a rotation axis (15) which is transverse to the longitudinal axis (11), and a handle (13) along the body for operating the wrench. A sensor (16) is intended to detect a torque applied with the wrench to the coupling (14) and comprises two flex sensor elements (16a and 16b) which are arranged spaced apart along the longitudinal axis (11).

Abstract: An electric tool includes an output shaft and a controller. The output shaft is configured to hold a tip tool and be rotated by motive power provided from an electric motor with the output shaft holding the tip tool. The controller is configured to control rotation of the output shaft in accordance with pressing force in a direction from a tip end of the tip tool toward the output shaft. The electric tool has, as an operation range, a restriction range in which rotation of the output shaft is restricted in a state where the pressing force is less than or equal to a prescribed value.

Abstract: A tightening machine of the present invention includes: a mobile receiving portion 20 that receives a positioning signal (GNSS signal) from positioning means (GNSS satellite Sa); a geomagnetic sensor 30 that detects a direction of a socket portion 41 with the mobile receiving portion 20 as a starting point; and a control portion that receives the positioning signal received by the mobile receiving portion 20 and a positioning signal received by a fixed receiving portion 22 at a fixed position away from a torque wrench 110 serving as the tightening machine, corrects a three-dimensional position of the mobile receiving portion 20 based on the positioning signals, and calculates a three-dimensional socket position of the socket portion 41 of the torque wrench 110 serving as the tightening machine based on a result of the correction and the direction of the socket portion 41 detected by the geomagnetic sensor 30.

Abstract: A calibration monitoring system is provided to automatically monitor the calibration status of tools and other inventory items, such as upon the items being issued from or returned to the automated calibration monitoring system. The system identifies an inventory item, for example a calibrated torque wrench or other calibrated tool identified based on a unique identifying tag attached thereto. The system retrieves a calibration parameter value for the item from a calibration database, and completes a calibration measurement of the item based on the calibration parameter value. In the example, a torque measurement of the calibrated torque wrench can thus be automatically completed. In turn, the system determines a current calibration status of the item based on the calibration measurement, and selectively enables or disables issuance of the inventory item from the system according to the item's status as being in calibration or out of calibration.

Abstract: A tool for a bone implant includes a rod and an adaptor. The rod includes a coupling portion having a through-hole. The rod further includes a measuring arm connected to the coupling portion and a force applying arm connected to the coupling portion. The measuring arm includes a first extension section having a first indicator portion, and the force applying arm includes a second extension section having a second indicator portion. The force applying arm is elastically deformable away from the measuring arm to displace the second extension section relative to the first extension section. The adaptor is coupled in the through-hole and includes an outer ring and an inner ring. The outer ring is rotatable relative to the inner ring in a single direction.

Abstract: A setting method for an electronic torque tool is disclosed. The electronic torque tool includes a tool body that stores at least one operation set. The operation set includes at least one adjustable operation parameter of the electronic torque tool. The setting method can be used to adjust the operation parameter in the operation set and includes a setting step and a storing step. The setting step includes entering the operation set and adjusting the operation parameter therein. The storing step includes storing the adjusted operation parameter in the operation set directly after an operator quits the operation set or turns off the electronic torque tool during the setting step. The setting method allows the operation parameter in the operation set to be easily and rapidly set or adjusted, thereby making the electronic torque tool easy to use and operate.

Abstract: A torque tool is provided, including: a barrel; a first member disposed to the barrel, including at least one first engaging portion; a second member disposed in the barrel, including at least one second engaging portion, the at least one second engaging portion and the at least one first engaging portion being disengageably engaged with each other; an elastic mechanism, disposed inside the barrel and including elastic arms, the second member being configured to abut and radially deform the elastic arms; wherein when there is a torsional three greater than a preset torque value between the at least one second engaging portion and the at least one first engaging portion, the second member urges and radially defines the plurality of elastic arms so that the at least one second engaging portion and the at least one first engaging portion are relatively slipable and disengageable.

Abstract: A torque tool with a segmented warning effect includes: a tool body having a sensing unit, a processing unit for receiving a sensed value of the sensing unit and comparing the sensed value with a predetermined value to output a comparison value; at least two warning intervals formed by the comparison value of at least two different warning ranges; a warning assembly for providing warning by a primary warning unit and at least one secondary warning unit; the primary warning unit uses at least two colors for different warning intervals, and at least two illuminators of each secondary warning unit to warn at least two stages, the primary warning unit provides a primary warning for the warning interval, and the secondary warning unit at each warning interval forms secondary warnings to let users know about the operating torque quickly.

Abstract: A vibrating wrench includes a housing, a driving head, a handle and a vibrating structure. The housing includes a hollow space. The driving head is disposed at one end of the housing. The handle is disposed at the other end of the housing and includes an inner wall and a containing space. The containing space is communicated with the hollow space. The vibrating structure is disposed in the containing space of the handle and includes a vibrating motor and a medium element. The medium element is fully connected or partially connected to an outer surface of the vibrating motor. The inner wall of the handle is fully connected or partially connected to the medium element.

Abstract: A ratchet wrench having multiple driving modes with torque sensing function includes an annular head, a driving unit, a control unit, a rotary member, a forcing unit and at least one torque sensor. The annular head receives the driving unit therein and a shaft extends from the annular head. The driving unit has a first toothed ring engaged with a first pawl, and a second pawl engaged with inner teeth of the annular head. The rotary member is rotatably inserted in the shaft, and has two ends to the driving unit and the forcing unit respectively. The forcing unit includes a tubular handle and a display unit. The torque sensor is mounted on the shaft. The shaft inserts into an axial chamber of the handle. The torque sensor is positioned between the axial chamber and the shaft. When the shaft is bended by the handle to produce a deformation.

Abstract: A tool is portable and is to be used with a grip of the tool gripped thereon. The tool includes a vibration generating device. The vibration generating device is configured to generate vibration to notify a state of a machine. The vibration generating device is disposed inside the grip. The vibration generating device is disposed to vibrate in a direction substantially orthogonal to an axial direction of the grip.

Abstract: The tightening tool includes: a main body configured to be able to be held by a worker and including a turn detector; a head having an approximately rod shape and provided in the main body, which can engage with a tightened member; a head pin configured to pivotally support the head in the main body to turn the main body with respect to the head; and a spring configured to restrict the main body from turning with respect to the head by a compressive force in a longitudinal direction of the head. When a tightening torque reaches a preset torque value, the turn detector is released from restriction by the spring to turn around the head pin in a first direction and then turn in a second direction, and therefore detects turns of the main body with respect to the head in the first direction and the second direction.

Abstract: The tightening tool includes: a main body configured to be able to be held by a worker and including a turn detector; a head having an approximately rod shape and provided in the main body, which can engage with a tightened member; a head pin configured to pivotally support the head in the main body to turn the main body with respect to the head; and a spring configured to restrict the main body from turning with respect to the head by a compressive force in a longitudinal direction of the head. When a tightening torque reaches a preset torque value, the turn detector is released from restriction by the spring to turn around the head pin in a first direction and then turn in a second direction, and therefore detects turns of the main body with respect to the head in the first direction and the second direction.

Abstract: A force acting on a link is detected at low cost. Provided is a rotation-shaft joint structure including: a driving-force generating part including a fixed member that is fixed to a base member, and a movable member that is rotationally driven about a predetermined axis relative to the fixed member; a link member that is fixed to the movable member of the driving-force generating part; and a uniaxial strain sensor that is attached to the link member or the movable member, at a surface located in a space between a fixed area over which the link member is fixed to the movable member and the outer circumferential surface of the driving-force generating part about the axis, to detect the strain of the surface.

Abstract: A hand tool module having an interconnection device, which has an interface. The interconnection device has, in addition to the interface, at least one auxiliary interface, which is provided to bidirectionally exchange at least power at least with one additional hand tool module and/or a hand tool.

Abstract: A torque wrench includes a solenoid driven release mechanism and a transceiver for wirelessly transmitting and receiving parameter set.

Abstract: A wrench adapter device adapts a conventional box wrench for use with a ratchet. The device includes a housing having a top face, a bottom face, and a perimeter wall coupled to and extending between the top face and the bottom face. The perimeter wall comprising a plurality of planar faces wherein the housing is configured for insertion into a wrench such that the housing is engaged to be rotated by the wrench. A socket extends into the top face of the housing wherein the housing is configured for being engaged by insertion of a drive of a ratchet into the socket.

Abstract: An electronic torque wrench including a wrench body, a wrench head configured to engage a workpiece, a first sensor producing a first output signal, that is proportional to an amount of torque being applied to the workpiece, a grip handle, a second sensor producing a second output signal that is proportional to an amount of rotation being applied to the workpiece, a user interface including an input device for inputting a preset torque value, and a processor for converting the first output signal into a current torque value, comparing the current torque value to the preset torque value, and converting the second output signal into a first angle value through which the workpiece has been rotated after the current torque value exceeds the preset torque value.

Abstract: A torque multiplier includes an input element, an output element, a multiplying unit, a measurement unit and a display. The input element is used for connection to a tool operable for exerting torque. The output element is used for connection to an object to be driven by the tool. The multiplying unit is used for connecting the input element to the output element and turning a lower value of torque at the input element to a higher value of torque at the output element. The measurement unit is used for measuring the higher value of torque and accordingly sending a wireless signal. The display is used for receiving the wireless signal and accordingly showing the higher value of torque.

Abstract: An electronic torque wrench includes a main body, a display device and at least one pushbutton module. A torque detector is disposed on the main body in adjacency to a working head for outputting a torque value. The display device has an operation unit and a display panel. The pushbutton module is for setting a torque value. The pushbutton module and the torque detector are electrically connected to the operation unit. The operation unit serves to receive and process the torque value to display the torque value on the display panel. The display panel and the pushbutton module are respectively disposed on a top side and a lateral side of the main body.

Abstract: An electronic torque wrench or other tool, and a method and a computer program for using the same, are disclosed. The disclosed systems allow a user to operate the tool in either a manual mode or automatic mode. In the manual mode, torque or angle targets are input into the wrench before the torqueing operation, and in the automatic mode, preset torque or angle targets are selected by the user. A user can also lock the tool so only a specific torqueing operation can be used without unlocking the tool. The torque and angle values can be input simultaneously such that a work piece can be torqued to a predetermined torque and angle without separate operations. An indicator can also be implemented that indicates the progress of the torqueing operation.

Abstract: An electronic torque wrench including a wrench body, a wrench head configured to engage a workpiece, a first sensor producing a first output signal, that is proportional to an amount of torque being applied to the workpiece, a grip handle, a second sensor producing a second output signal that is proportional to an amount of rotation being applied to the workpiece, a user interface including an input device for inputting a preset torque value, and a processor for converting the first output signal into a current torque value, comparing the current torque value to the preset torque value, and converting the second output signal into a first angle value through which the workpiece has been rotated after the current torque value exceeds the preset torque value.

Abstract: A torque wrench comprises a handle, a wrench head having a ratcheting workpiece engaging portion, and a tensor beam defining a longitudinal axis and having a rectangular cross-section perpendicular to the longitudinal axis. A first strain gauge is coupled to one side of the tensor beam, and a second strain gauge is coupled to another side orthogonal to the one side. A processor coupled to the first and second strain gauges converts an output signal from one of the strain gauges into an equivalent torque value. The tensor beam is intermediate the handle and the wrench head and is rotatably coupled to the wrench head and is rotatable, with respect to the tensor beam, between a first position in which the processor processes an output signal from the first strain gauge and a second position in which the processor processes an output signal from the second strain gauge assembly.

Abstract: A torque wrench for use in driving fasteners is provided. The wrench includes an electronics unit disposed within a body of the wrench that is capable of sensing and measuring the torque applied to a fastener by the wrench and providing an output of the level of torque to the user. The electronics unit is also disposed within a barrier in the body that isolates the unit from the exterior environment around the wrench. The data sensed by the electronics unit can be utilized to provide feedback to the user regarding the operation of the wrench, and to monitor the overall operation of the wrench for calibration purposes, among other functions. During use, the wrench can provide the user with visual, audible and tactile feedback regarding the operation of the device relative to stored maximum torque values stored in the electronics unit.

Abstract: An electrical torque screwdriver includes a handle, a shaft, a torque limiter, and an electrical switch. The shaft is disposed on the handle and rotatable but not movable linearly. The torque limiter includes a driving tooth, a slipping block, a pawl, and at least one restoring element. The driving tooth is disposed on the shaft. The slipping block is disposed on the handle. The slipping block is displaceable linearly but not rotatable. The pawl is disposed on the slipping block and engaged with the driving tooth. The restoring element is pivotally disposed on the handle and has a restoring force, wherein one end of the restoring element resists against the slipping block for pushing the pawl to be engaged with the driving tooth. The electrical switch is disposed on the handle for optionally resisting against the other end of the restoring element to stop the restoring element.

Abstract: An electronic torque wrench (10) comprising a grip body (11) with a user interface (12) and a control electronics (13) for controlling the wrench. From one extremity of the grip body protrudes a mechanical connection element (14) that terminates at one extremity with a tightening head (16). In the connection element are torque sensors (18) for determining the torque transmitted between the grip body and the head and the connection element (14) is connected in a removable and replaceable way to the grip body (11) and comprises memory means (19) containing data for calibrating the wrench to such connection element (14) and means for transferring such data to the control electronics.

Abstract: A quick-release angle measuring device is disclosed. The quick-release angle measuring device is applied to a hand tool, and includes a body, an angle sensor, a controller, a monitor and a power supply. The body has a quick-release part arranged on the body and for being detachable connected to the hand tool. The angle sensor is arranged in the body for detecting an angle value of the hand tool. The controller is arranged in the body and is signally connected to the angle sensor for a user to set a factor on the angle value. The monitor is arranged on the body and is signally connected to the controller for displaying the angle value. The power supply is arranged in the body for supplying electric power to the controller, the angle sensor and the monitor.

Abstract: A torque wrench for use in driving fasteners is provided. The wrench includes an electronics unit disposed within a housing engaged with the body of the wrench that is capable of sensing and measuring the torque applied to a fastener by the wrench and providing an output of the level of torque to the user. The data sensed by the electronics unit can be utilized to provide feedback to the user regarding the operation of the wrench, and to monitor the overall operation of the wrench for calibration purposes, among other functions. During use, the wrench can provide the user with visual, audible and tactile feedback regarding the operation of the device relative to stored maximum torque values stored in the electronics unit. The housing for the electronics unit can be formed to be a single use component of the tool or can be designed for multiple uses with a configuration that can be engaged with cradles forming the body of the wrench having various different configurations.

Abstract: An electronic torque wrench includes: a shank body, a drive head being connected with a front end of the shank body; a handle having a front handle section and a rear handle section, the front handle section being connected with a rear end of the shank body, a cell room being formed in the front handle section for placing cells therein, a front end of the rear handle section being detachably connected with the rear end of the front handle section; an electronic operation/control device disposed on the shank body; and at least one torque sensor mounted on the shank body. The front and rear handle sections together form the handle for a user to hold. The rear handle section of the handle serves as a cell cap for closing the cell room so as to shorten the length of the wrench.

Abstract: An electronic torque wrench includes: a wrench main body including ahead section and a shank body, at least one recess being formed on a wall face of one side of the shank body, a top face of the shank body being inward depressed to form a platform, a rear end of the shank body being inward recessed to form a cavity for placing cells therein, a through hole being formed on the shank body in communication with the platform and the cavity; at least one torque sensor disposed in the recess; and an electronic operation/control device disposed on the platform. The outward protruding volume of the operation/control device is reduced to minify the total volume of the wrench and the platform and the recess enhance the flexion of the shank body.

Abstract: A torque wrench for use in driving fasteners is provided. The wrench includes an electronics unit disposed within a body of the wrench that is capable of sensing and measuring the torque applied to a fastener by the wrench and providing an output of the level of torque to the user. The electronics unit is also disposed within a barrier in the body that isolates the unit from the exterior environment around the wrench. The data sensed by the electronics unit can be utilized to provide feedback to the user regarding the operation of the wrench, and to monitor the overall operation of the wrench for calibration purposes, among other functions. During use, the wrench can provide the user with visual, audible and tactile feedback regarding the operation of the device relative to stored maximum torque values stored in the electronics unit.

Abstract: An electronic torque wrench including a wrench body, a wrench head configured to engage a workpiece, a first sensor producing a first output signal, that is proportional to an amount of torque being applied to the workpiece, a grip handle, a second sensor producing a second output signal that is proportional to an amount of rotation being applied to the workpiece, a user interface including an input device for inputting a preset torque value, and a processor for converting the first output signal into a current torque value, comparing the current torque value to the preset torque value, and converting the second output signal into a first angle value through which the workpiece has been rotated after the current torque value exceeds the preset torque value.

Abstract: A power wrench with a torque sensing unit includes a housing, a motor, an output shaft, and a planetary reduction gearing connecting the motor to the output shaft and including a stationary ring gear supported in the housing, wherein the torque sensing unit includes a torque transferring element with a single radially extending reaction arm arranged to transfer reaction torque from the ring gear to the housing and carrying strain measuring sensors for generating signals in response to the transferred reaction torque. The torque transferring element includes an annular body with two weak portions to be elastically deformed during torque transfer and having flat surfaces for carrying the strain measuring sensors.

Abstract: A torque wrench includes a driving head, a hollow handle, compression unit, an adjustment unit, an index unit and a display unit. The driving head and the handle are pivotably connected to each other. The compression unit has a resilient member and an end piece which contacts the driving head. The adjustment unit adjusts the length of the resilient member to set the torque of the wrench. The index unit has a first index and a second index, both of which are moved with the movement of the adjustment unit. The movement of the first index is detected by the display unit and transferred into digits to display the value of the torque. The second index is cooperated with the marks of the scale member to display the value of the torque.

Abstract: A torque wrench for use in driving fasteners is provided. The wrench includes an electronics unit disposed within a body of the wrench that is capable of sensing and measuring the torque applied to a fastener by the wrench and providing an output of the level of torque to the user. The electronics unit is also disposed within a barrier in the body that isolates the unit from the exterior environment around the wrench. The data sensed by the electronics unit can be utilized to provide feedback to the user regarding the operation of the wrench, and to monitor the overall operation of the wrench for calibration purposes, among other functions. During use, the wrench can provide the user with visual, audible and tactile feedback regarding the operation of the device relative to stored maximum torque values stored in the electronics unit.

Abstract: An electronic apparatus for controlled fastening, comprises a body (11) coupled to which is one of different removable inserts (17, 17?, 17?). The insert comprises a transponder (18) which sends setting signals to the apparatus when it is mounted on the apparatus. The apparatus in turn comprises transmission means for programming into the transponder (18) information which shall be inserted into the signals which shall subsequently be sent by the transponder to the apparatus.

Abstract: A torque wrench for use in driving fasteners is provided. The wrench includes an electronics unit disposed within a body of the wrench that is capable of sensing and measuring the torque applied to a fastener by the wrench and providing an output of the level of torque to the user. The electronics unit is also disposed within a barrier in the body that isolates the unit from the exterior environment around the wrench. The data sensed by the electronics unit can be utilized to provide feedback to the user regarding the operation of the wrench, and to monitor the overall operation of the wrench for calibration purposes, among other functions. During use, the wrench can provide the user with visual, audible and tactile feedback regarding the operation of the device relative to stored maximum torque values stored in the electronics unit.

Abstract: In one embodiment, a method and apparatus for reducing time expended on non-value added tasks during assembly of an aircraft is provided. A RFID tag reading function of a RFID tag reader integrated into user apparel is enabled. The RFID tag reader comprises a set of touch activation components integrated into the user apparel. A touch activation component in the set of touch activation components is pressed against a surface in proximity of a RFID tag associated with an aircraft component. The RFID tag reader transmits an interrogate signal to an RFID tag associated with the aircraft component. The user observes a display device coupled to the RFID tag reader integrated into the user apparel, wherein the display device displays RFID tag information received from the RFID tag in response to the interrogate signal. The RFID tag information comprises data describing the aircraft component. The user receives the RFID tag information without interrupting an assembly task.

Abstract: Disclosed is a torque wrench with wireless transmission function, including at least one wrench body having an end to which a tool head is coupled for coupling with a tool piece, such as wrench socket, for application of torque, at least one toque-strain bar, which is coupled to the tool head of the wrench body, at least one torque sensor, which is mounted to the toque-strain bar to detect the value of the torque transmitted to the toque-strain bar, at least one angular position sensor, which is set inside the wrench body to detect a horizontal angle of the body and the tool head, at least one detection and processing circuit, which is arranged in the wrench body and connected to the torque sensor and the angular position sensor to convert detected torque and angle into digital torque and angle data for displaying or issuing an alarm and to transmit the torque and angle data in a bi-directional wireless manner, and at least one control receiver, which receives the torque and angle data from the detection and

Abstract: An electronic torque apparatus equipped with an automatic compensation device with output torque includes an electronic torque wrench with a changeable drive head, a plurality of drive heads at varying lengths and an automatic compensation device in the electronic torque wrench with built-in output torque. One of the drive heads is selected to be installed on the electronic torque wrench as desired. Through the automatic compensation device, compensation is set and calculated according to the type or length of the drive head so that operation torque of the electronic torque wrench and preset target torque are equal to actual output torque of the electronic torque wrench. Thereby users can directly and instantly get the actual output torque on a display element without calculation or conversion through tables to improve reliability and usability.

Abstract: A torque wrench includes a wrench body, a torque sensor, an angle sensor, a gravity sensor and a processor. The wrench body can provide a torque to a workpiece. The torque sensor can sense whether the torque is greater than a predetermined torque value. The angle sensor can obtain a rotational angle value by measuring the rotation of the wrench body after the torque is greater than the predetermined torque value. The gravity sensor can sense the tilt angle of the wrench body. The processor is programmed to correct the rotational angle value according to the tilt angle of the wrench body.

Abstract: An electronic torque wrench a wrench head unit adapted to engage and turn a fastener, a tubular first wrench body securely engaged with the wrench head unit, a tubular second wrench body coupled and aligned with the first wrench body by a fitting member to permit rotation of the second wrench body relative to the first wrench body, a mounting shell sleeved on the second wrench body for mounting a display unit to provide a display representing a measured torque. By rotation of the second wrench body, the display unit can be adjusted to a desired angular position for being viewed easily by the user.

Abstract: An electronic torque wrench includes a wrench head unit adapted to engage and turn a fastener, a tubular wrench body which includes a front tubular end fittingly engaged and secured with the wrench head unit, and an intermediate tubular segment having an access opening, a grip handle which is configured to securely grip a rear tubular end of the tubular wrench body, a mounting shell which is sleeved on the intermediate tubular segment, and which has an access hole communicated with the access opening, a housing sleeve sleeved on, and rotatable relative to the mounting shell about a lengthwise axis, and a display unit disposed on the housing sleeve to provide a display representing a torque measured by a strain gauge on the wrench head unit. By rotating the housing sleeve, the display unit can be adjusted to a desired angular position for being viewed easily by the user.

Abstract: A wrench includes a hollow handle, a driver, a battery base, an alert device, a switch and a force applying device. The driver includes a drive shaft and a drive head. The drive shaft is received in the hollow handle and pivotally connected to the inner wall of the hollow handle. The drive head is connected to the drive shaft and protrudes from the hollow handle. The switch electrically connects the battery base and the alert device. The switch includes a first contact and a second contact. The first contact is located on the drive shaft. The second contact is located on the inner wall of the hollow handle. The force applying device applies a predetermined force to the drive shaft to separate the first contact and the second contact.

Abstract: A torque wrench includes a driving head, a hollow handle, compression unit, an adjustment unit, an index unit and a display unit. The driving head and the handle are pivotably connected to each other. The compression unit has a resilient member and an end piece which contacts the driving head. The adjustment unit adjusts the length of the resilient member to set the torque of the wrench. The index unit has a first index and a second index, both of which are moved with the movement of the adjustment unit. The movement of the first index is detected by the display unit and transferred into digits to display the value of the torque. The second index is cooperated with the marks of the scale member to display the value of the torque.

Abstract: An extensive apparatus includes a shaft, a sensor, a display, a sleeve and a shell. The sensor is attached to the shaft so that the sensor detects torque exerted on the shaft. The display is electrically connected to the sensor so that the value of the torque detected by the sensor is shown on the display. The sleeve includes a tunnel through which the shaft extends. The sleeve is connected to the shaft so that they can only rotate together. The shell is rotationally provided around the sleeve. The display is connected to the shell so that the display is rotational relative to the shaft and easily observable regardless of the shaft.