Abstract: An impact tool includes a motor, a control unit, an output shaft, a transmission mechanism, and an impact detection unit. The transmission mechanism includes an impact mechanism. The impact mechanism applies impacting force to the output shaft while performing an impact operation. The impact detection unit determines, based on at least one of an excitation current (current measured value) to be supplied to the motor or a torque current (current measured value) to be supplied to the motor, whether or not the impact operation is being performed. The control unit places a limit on an increase in the number of revolutions of the motor before the impact detection unit detects the impact operation and removes the limit on the increase in the number of revolutions of the motor when the impact detection unit detects the impact operation.

Abstract: A power tool is provided including a tool housing including a motor housing and a handle portion extending longitudinally from the motor housing; a battery receptacle disposed at an end of the handle portion opposite the motor housing, the battery receptacle being configured to receive a battery pack; and a brushless DC (BLDC) motor including an electronically-commutated stator assembly and a rotor assembly configured to rotate with respect to the stator assembly, the stator assembly comprising a stator lamination stack sized to be received within the motor housing having a circumference of approximately 140 to approximately 190 mm. The motor produces a maximum power output of at least 1600 watts for driving an output shaft at a maximum torque of at least 30 inch-pounds and a maximum speed of at least 8000 rotations-per-minute.

Abstract: A portable power tool includes an electromotive drive with an output shaft defining a first axis and having a first end portion and a second opposite end portion. The first end portion is between a mounted machining tool and the second end portion. The electromotive drive is received in a first power tool housing portion and includes a stator having a first stator end defining a first plane and a second stator end defining a second plane, the first plane is located between the first end portion and the second plane. A second power tool housing portion defines a handle gripping portion with a first surface defining a third plane which intersects the output shaft at a location whereat the first plane is between the third plane and the second plane. A second surface portion opposite the first surface portion defines a fourth plane parallel to the third plane.

Abstract: A surgical cutting tool includes an elongated shaft and a cutting head. The shaft defines a coupling portion terminating at a proximal end of the shaft, a stem portion, and a distal portion. The stem portion defines a central axis. The coupling portion optionally defines a deflection surface positioned oblique with respect to the central axis and connected with a first driven surface and a second driven surface. Upon insertion into a drive chuck, the deflection surface promotes self-alignment of the cutting tool and the drive chuck.

Abstract: A power tool is provided including a gear case having a spindle, a motor case connected to a rear end of the gear case along a longitudinal axis; a handle portion extending from a rear end of the motor case along the longitudinal axis; a motor housed inside the motor case; a fan in rotational connection with the motor; at least one air intake arranged at least one of the motor case or the handle portion near the rear end of the motor case; and a power module including power switches for driving the motor and a heat sink. The power module is housed in at least one of the motor case or the handle portion near the rear end of the motor case such that rotation of the fan causes air flow to enter through the air intake and flow near the heat sink and through the motor.

Abstract: A rotary impact tool includes an impact assembly, a brushless motor, a transmission assembly, a drive circuitry, and a controller. The controller is configured to acquire a commutation interval of the brushless motor, output a first control signal to the drive circuitry causing the brushless motor to operate at a preset initial speed, and output a second control signal to the drive circuitry to gradually increase a rotational speed of the brushless motor to a preset final speed, when a commutation interval of the brushless motor becomes greater than or equal to a preset time threshold, where the preset initial speed is less than the preset final speed.

Abstract: A method for automated installation of a semi-tubular fastener rivet is provided. The method includes controlling a numerical control drilling and riveting machine having an upper head and a lower head, to control movement of a lower pressure bushing, to apply a clamping force to hold a workpiece against an upper pressure bushing. The method includes controlling an upper drill spindle on the upper head, to drill a rivet-receiving hole from an upper side of the workpiece and to countersink the rivet-receiving hole. The method includes controlling a lower drill spindle on the lower head, to countersink the rivet-receiving hole from a lower side of the workpiece. The method includes controlling movement of an upper anvil from a retracted position to an installation position, and controlling movement of a lower anvil, to apply an upset force to a tail portion of the semi-tubular fastener rivet installed in the rivet-receiving hole.

Abstract: A pneumatic ratchet wrench is connected with an air supply device and contains: a housing, a ratchet head unit, an impact clutch unit, and a driving unit. The housing extending along a first axis line and includes an opening defined on a front end thereof and an intake formed on a distal end thereof so as to couple with an air supply device. The ratchet head unit is received in the housing and includes a drive square extending along a second axis line and extending out of the opening The impact clutch unit is received in the housing and is coupled with the ratchet head unit. The driving unit is disposed in the housing and includes a multi-chamber cylinder, a rotor member inserted into the multi-chamber cylinder and connecting with the impact clutch unit. The multi-chamber cylinder has a body, a first chamber, and a second chamber communicating with the first chamber.

Abstract: A two-piece planet carrier for use in a power hand tool, the carrier comprising a drive portion mountable to a rotor of the tool and a pinned portion having a crank pin. The crank pin operatively connectable to a drive shaft of the tool to provide rotation and torque to the drive shaft. The pinned portion rotatably engaged with the drive portion such that rotation of the rotor will cause the drive portion and the pinned portion to rotate relative to each other as a function of a load applied to the drive shaft such that an offset between a crank pin center axis and a drive portion axis of rotation is variable as a function of the load, wherein the variance of the offset will vary a rotational speed and an amount of torque delivered to the drive shaft as a function of the load.

Abstract: An electric tool and a method for fastening a threaded member by using it, the electric tool has a torque output system and a control system configured to, according to a fastening level selected by a user, invoke a corresponding data to drive the motor to enable it to output with designated single-time impact quantity and impact times.

Abstract: In at least one illustrative embodiment, a rotary impact tool comprises a motor including a rotor and an input shaft coupled to the rotor for rotation therewith about an input axis, an anvil configured to be rotated about an output axis and including an output shaft, a carrier driven by the input shaft and having a passage extending through a distal end thereof, and a hammer supported and driven by the carrier and configured to impact the anvil to cause the anvil to rotate about the output axis. The anvil may comprise a blade coupled to the output shaft and configured to direct a lubricating fluid through the passage when the anvil or carrier rotates about the output axis.

Abstract: An impact type fastening tool, has a housing, a motor received in the housing, a main switch for controlling ON and OFF operations of the motor, an impact mechanism connected to the motor, and a control device. The control device comprises a current detecting module and a main control module connected to the current detecting module. The main control module can judge whether the impact mechanism performs an impact according to the signal detected by the current detecting module and control the motor to automatically stop in a preset time period after the impact mechanism performs an impact.

Abstract: A lock state occurrence determination apparatus includes a counter, a reset device, a reference time changing device, a lock state determination device, and an invalidation device. The invalidation device performs, in a case where a false determination of occurrence of a lock state of a motor is caused by the lock state determination device due to an operation input to operate a rotation speed of the motor, at least one of a first invalidation operation to invalidate the lock state determination device and a second invalidation operation to invalidate continuation of a counting operation by the counter.

Abstract: A pneumatic ratchet wrench includes a transmission mechanism (200) having a transmission shaft (210) with a driving end (211) and a transmitting end (212) extended from the driving end (211), a clutch seat (240) and two hammer rings (250), a pneumatic motor (300) and a ratchet joint (400). Two opposite anvils (220) are formed on the driving end (211), and an eccentric shaft (230) is axially protruded from the transmitting end (212). The clutch seat (240) is rotably sheathed on the driving end (211) and has two parallel limit pins 241, and the hammer rings (250) are installed to the limit pins (241) and corresponsive to the anvils (220) respectively. The pneumatic motor (300) is coupled to the clutch seat (240) for driving and rotating the clutch seat (240). The ratchet joint (400) is coupled to the eccentric shaft (230) and driven by the transmission shaft (210).

Abstract: A power driven tool for rotating a mechanical element includes a housing including a base and a head connected to the base. The head has a yoke formed by opposing arms separated by an opening. A selectively operable motor is positioned in the housing having an output shaft that rotates relative to the housing during operation of the motor. A ratchet mechanism is mounted in the housing and includes an output drive at least partially mounted in the opening for rotation relative to the housing to rotate the mechanical element in a selected direction. A cap is positioned on the head of the housing across the opening forming the yoke. The cap reinforces the yoke during operation of the tool to prevent the arms from separating and blocking at least part of the opening between the arms to prevent debris from entering the ratchet mechanism.

Abstract: A through-hole type power ratchet wrench includes a socket bracket, a swingable member, a ratchet socket, first and second pawls, and first and second resilient elements. The swingable member is disposed in the socket bracket and adjacent to an outer surface of the ratchet socket. The pawls are swingably fixed on the swingable member. The pawls, biased by the respective resilient elements, tend to engage with the outer surface of the ratchet socket. The wrench also includes a limiting member configured to isolate one of the first and second pawls from the ratchet socket. The limiting member is formed with an opening adapted for allowing one of the pawls to pass therethrough, and the limiting member is moveable about the ratchet socket between first and second positions. The opening of the limiting member faces towards the first pawl and second pawls when at the first and second positions, respectively.

Abstract: A method of feeding a stud to a joining head including a stud shank clamp and operable to join the stud to a workpiece, and wherein the method of feeding the stud comprises the steps of providing a stud holding device including a securing sleeve and a plurality of collet arms; feeding the stud into the stud holding device to a first position wherein the flange is arranged above the free end of the plurality of arms and below the securing sleeve; and securing the stud in the first position by engaging the securing sleeve behind the flange.

Abstract: An impact ratchet wrench includes a motor assembly, a transmission assembly, an impact assembly and a ratchet assembly which are arranged in a housing and connected with each other in turn. The motor assembly drives the transmission assembly and the transmission assembly includes a cylindrical gear train for providing an output at a first rotating speed or a second rotating speed lower than the first rotating speed. The impact assembly includes a striking member that is driven by the transmission assembly and an output member. The striking member of the impact assembly provides an increasing torque to the output member intermittently to drive the ratchet assembly.

Abstract: A holding device for holding a stud, which includes a radially projecting flange in a securing position, comprises a collet component including a hollow tubular insertion section defining an insertion axis, and a clamping section operable to exert a radially inwardly directed clamping force for clamping the stud. A securing device is arranged on the insertion section and includes a securing sleeve formed of plurality of separate securing-sleeve sections that are radially movable relative to one another. A clearance space is defined between a bottom end of the securing-sleeve sections and a top end of the clamping section, and the clearance space is operable for holding a flange of a stud in the securing position.

Abstract: An auto hammer with a striking device includes a striking rod and a clamping mechanism. The striking rod continually strikes a component to gradually insert the component into a workpiece. The clamping mechanism includes at least one clamping element, a biasing device, a bush and a sleeve, and the clamping elements are movable between a closed position and an opened position. The bush is arranged around the striking rod so as to prevent the nail head from becoming trapped in a gap which is formed after the clamping elements are entirely opened. The biasing device is arranged for biasing the bush toward the direction of striking the component. This clamping mechanism can reliably clamp nails or other components to facilitate user operation of the device.

Abstract: An auto hammer having a housing, a grip portion and a striking device. The striking device includes a striking rod for striking a nail or other element using a straight reciprocating motion. The striking device has an associated clamping mechanism for clamping the nail or other element. The clamping mechanism has a driving portion, a first clamping portion, and a second clamping portion. The first and second clamping portions are moved between a closed position and an opened position. In the closed position, the element is held between the first and second clamping portions. A first slot and a second slot are arranged on the first and second clamping portions respectively. The driving portion is arranged in both the first and second slots and moves along the first and second slots.

Abstract: An implement for loosening stuck connection elements includes a striker hammer with a connecting portion for connection to a percussion tool at one end, and a striking surface for imparting an impulsive stress at the other end; a counteracting body opposing the striker and having an abutment surface that faces towards the striking surface; a retainer for retaining the striker to the counteracting body, while keeping a predetermined minimum distance between the striking surface and the abutment surface (8), so adapted to accommodate at least one of the elements of a pair to be loosened. A combination of the implement with a percussion tool and/or a wrench.

Abstract: An impact tool includes: a spindle disposed in a housing; an anvil disposed in front of the spindle and rotatably supported by the housing through a metal bearing, a rear surface of the anvil having a bearing hole in which a front end of the spindle is received; an impact mechanism configured to transmit a rotation of the spindle to the anvil; an outer groove formed on an outer periphery of the anvil and opposed to the metal bearing; and a connecting opening radially extending in the anvil and connecting the bearing hole and the outer groove to provide a communication therebetween. The outer groove is formed to have a depth in the range of 3-10% of an outer diameter of the anvil, and the connecting opening opens at a rear end of the outer groove in an axial direction of the anvil.

Abstract: Disclosed is a centrifugal impact wrench using an electric driving motor, which is rotated by electricity supplied from an electric power source, as a power source.

Abstract: A power driven tool for rotating a mechanical fastener including a housing with a motor positioned in the housing. The motor includes a drive shaft that rotates relative to the housing. An impact mechanism in the housing is operatively connected to the motor drive shaft. The impact mechanism has a base, an output and a cam. The output and cam are rotatably mounted on the base. A pair of hammers are pivotally mounted on the base and selectively positioned by the cam. The cam biases the hammers to intermittently impact the output. A ratchet head assembly is operatively connected to the output of the impact mechanism. The ratchet head assembly includes an output member rotatably mounted on the housing to rotate the mechanical fastener. The assembly also includes a ratchet operable to limit rotation of the output member in a selected direction.

Abstract: A method and apparatus for fastening a first relatively soft structural component such as a wood panel to a second relatively hard structural component such as a steel angle iron using fasteners each having a forward self-drilling portion, a rearward, self-tapping portion, and an outwardly projecting head. The fasteners are driven by a pneumatic rotary impact driver and the method comprises rotatively driving each fastener so as to cause its self-drilling portion to drill a first hole through the wood panel and thereafter rotatively driving and impacting that fastener so as to cause its self-drilling portion to drill a second hole in the angle iron and its self-tapping portion to form a screw connection with the angle iron around the second hole.

Abstract: A torque intensifying tool for tightening and loosening threaded connectors has at least one torque intensifier means having a torque intensifier housing portion, having input means and having a first output means and a second output means, a drive operatively connected with the input means for transmitting a torque from the drive through the intensifying means to a threaded connector, so that in one mode of operation the torque intensifier housing portion together with the first and the second output means turn in the same direction and the same speed and torque as the input means, and in another mode of operation the torque intensifier housing portion together with one of the first and second output means receives a turning force in one direction while the other one of the first and second output means receives an equal turning force in the opposite direction at a lower speed but higher torque than the input means, and so that one of the first and second output means turns in the one mode and in the another

Abstract: A pneumatic wrench includes a pneumatic motor, a striking mechanism, and a drive shaft. The striking mechanism includes a support seat, a cam, a cover, and a hammer. Thus, the pivot shaft of the hammer has two opposite sides each formed with a reinforcing rib to reinforce the structural strength of the hammer. In addition, each of the first pivot shaft and the second pivot shaft has a guide groove to overcome the shear stress applied on the hammer during the rotation striking process of the hammer, thereby preventing the hammer from being distorted or broken due to concentration of a stress so as to enhance the lifetime of the hammer.

Abstract: A pneumatic wrench includes a pneumatic motor, a striking mechanism, and a drive shaft. The striking mechanism includes a cylindrical support seat, a cam, a cover, and a hammer. The hammer has a protruding engaging portion and a reinforcing rib juxtaposed to the engaging portion to reinforce the structural strength of the hammer. Thus, the two opposite sides of the hammer are connected by the reinforcing rib to reinforce the structural strength of the hammer, thereby preventing the hammer from being distorted or broken due to concentration of a stress so as to enhance the lifetime of the hammer.

Abstract: The invention relates to a device utilizing compressed air for loosening and tightening fasteners that are located in hard to access areas. The device enables a single operator to stabilize the device while applying pressure via a pneumatic hammer to loosen or tighten fasteners. The device uses socket principles that enable the user to switch the sockets and provide a wide variety of options to accommodate the shapes and sizes of the fasteners.

Abstract: An automatic jar lid opener comprises a cylindrical housing and a truncated conical lid retainer rotatably attached to the cylindrical housing. A rotary hammer assembly is installed in the housing to convert a torque output from a motor assembly in the housing, into a twisting impact force applied through the lid retainer to a threaded jar lid in order to break a seal or initial resistance securing the lid screwed on a jar.

Abstract: A hand tool includes a function end such as an box end at one end of the handle and a vibration device is connected to the other end of the handle. The vibration device includes a tubular hollow body for receiving a power supply unit, a driving unit and a control switch therein. An eccentric member extends from an end of the driving unit such that when the driving unit is activated, the rotation of the eccentric member shakes the whole handle of the tool. A contact head is connected to an end of the body and protrudes from an outer periphery of the handle so that the rusted nut can be shaken by the contact head to loose the rust on the nut.

Abstract: A screw driving tool including a housing (1), a hollow spindle (3) rotatably supported in the housing (1) with a possibility of a limited axial displacement relative thereto, a screw-in spindle 5 at least partially extending in the hollow cylinder (3), connected thereto for joint rotation therewith, and supported for a limited axial displacement relative thereto, an impact mass (15) for displacing the screw-in-spindle (5) in a screw-in direction, a drive motor (2) for rotating the screw-in spindle (5), and a clutch (6) located between the hollow spindle (3) and the drive motor output shaft (19) for transmitting rotational movement to the hollow spindle (3).

Abstract: A driver bit holding sleeve 6 is disposed in a shooting portion 4 so as to enable it to be rotated together with a driver bit 5 struck by a striking piston 2 while permitting the driver bit 5 to be slidably displaced in the shooting portion 4, and a piston-cylinder mechanism 10 for rotationally driving the holding sleeve 6 is arranged in the vicinity of the shooting portion 4. The piston-cylinder mechanism 10 is operatively associated with the holding sleeve 6 via a converting mechanism 17 for converting reciprocable linear movement of the piston-cylinder mechanism 10 into rotary movement of the holding sleeve 6. Since a striking sleeve 7 is threadably squeezed in a material to be handled after it is struck by a driver bit 5, any type of striking screw 7 having a circular head portion can easily and reliably be struck in the material.

Abstract: A battery powers the motor of an electrically powered impact gun. The body of the gun vibrates at some frequency and an aluminum brush holder therein is configured to vibrate at about the same frequency to minimize chatter and arcing of the brushes on the commutator bars.

Abstract: Device for screwing and unscrewing screws, bolts and nuts comprising an electric motor (2), a flywheel (14) fixed on an auxiliary shaft (5) connected to the output shaft of the electric motor by means of a pair of pinions (3, 4) made of elastic plastic material like polyurethane and a wrench (9) connectable to said flywheel by way of projecting teeth (15, 16) and moving axially in relation to said flywheel by way of an elastic member (11).

Abstract: A wrench has a handle with a jaw for gripping a workpiece. The jaw is formed of a first jaw member which moves transversely with respect to the handle and a second jaw member which is connected to the handle by an adjustment nut and extension to move relative to the first jaw member. An air motor delivers impact forces to a hammer which in turn transfers the impact forces to the first jaw member. The air motor is controlled by a valve secured to the handle. The surfaces of the jaw members may be exchanged to interface with specific workpieces.

Abstract: To prevent the head of small sized bolts from being twisted off by a rotary electrically powered impact tool, a structure is provided between the outlet drive of the impact tool and the head of the bolt to minimize the torque transmitted between the impact tool and the bolt head.

Abstract: An impact tool comprised of a light weight housing having a forward anvil and hammer compartment, a hollow handle, and a rear cradle to receive a 12 volt motor, its housing and wiring therefor, with the motor removably accessible by the removal of only two threaded bolts. A trigger operated on-off switch is mounted in the handle.

Abstract: The powered ratchet wrench 10 is constructed of several components. A throttle lever 20 controls the air flow to a rotary air motor 30. The rotary output of the motor is transmitted to the hammer assembly 40 of an impact clutch mechanism. A spring 50 biases an anvil shaft 60 into association with the hammer assembly 40. The anvil can be directly driven by the motor through the hammer assembly or can be driven intermittently by a series of rotational impacts from the hammer assembly. The rotation of the anvil shaft causes the reversible ratchet mechanism 70 to rotate in the desired direction, thus tightening or removing a threaded fastener. Only a small reaction force is transmitted by the tool to the operator once the fastener is tightened.

Abstract: A power tool apparatus which is hand-holdable during operation serves for facilitating especially heavy duty work, e.g. on a high scaffolding. The apparatus is composed of three building blocks, a central one haivng an elongated enveloping shell and an integral transverse wall dividing the shell into a forward and a rearward compartment. The latter contains a speed-reducing transmission unit and has a motor unit attached to the shell rear end. As a third building block the operator equipped with a kit according to the invention has the choice of several inset units, among them a simple front end wall with an intermediate shaft, and the same end wall and an impact-generating unit on the intermediate shaft, which inset units he can introduce through the open front end of the enveloping shell and exchange them as required without taking apart the transmission unit or detaching the motor unit. A handle can likewise be attached to the central shell unit.

Abstract: By transferring the power fed from a motor to a ratchet mechanism through means of an impact clutch mechanism, a relatively large torque is obtained by the impact clutch mechanism. In addition when a torque greater than a predetermined level is applied to the ratchet mechanism, reaction is never given to the operator's hand because the impact clutch mechanism does not transfer a force greater than the present torque to the ratchet mechanism, thus permitting safe operation. With the ratchet mechanism, moreover, it becomes possible to effect such operation as first loosening and removing by the operator's force such members as bolts and nuts which have been additionally tightened independently or strongly tightened to a level in excess of a certain torque preset for the device.

Abstract: An electric rotary power tool apparatus is adapted for loosening jammed or seized automobile wheel nuts or bolts and holdable by hand during operation. It comprises(1) an electric motor laid out to be driven by an electric direct current having an operational voltage of at least 8 to 30 volts and at least 20 up to 60 amperes, and comprising a stator, a rotor, first and second pole means, and a driving shaft bearing said rotor and having a rotary axis, the speed of said motor, at a nominal voltage of 12 to 24 volts ranging from 8000 to 30000 r.p.m. under load;(2) a casing in which the motor is housed;(3) an on-off and reversing switch;(4) tool socket means being adapted for receiving a socket tool therein and comprising a driven shaft, the speed under load of which driven shaft is in the range of from 1200 to 4000 r.p.m.

Abstract: Disclosed is a rotary impact tool comprising a case enclosing a drive motor, a hammer member with an inner working surface provided with projections, an intermediate member transmitting rotation from the motor to the hammer member and including a guide made eccentric relative to the axis of rotation and intended to transmit rotation from the drive motor to the hammer member as well as to provide translation of the hammer member in a plane perpendicular to the axis of rotation, a spindle disposed coaxially with the intermediate member, embraced by the inner working surface of the hammer member, and having on its outer surface projections corresponding to the projections made on the inner working surface of the hammer member to transmit impulse rotation to the spindle.

Abstract: A fastener driving tool comprising a tool body defining a fastener drive track, a fastener driver mounted in the drive track for movement through successive drive and return strokes, a magazine providing a space for retaining a coiled strip of fasteners, a guide passage leading from the magazine to the drive track along which a leading end portion of the strip with supported fasteners can be moved, and a fastener feeding mechanism for moving the leading end portion of the strip with fasteners along the guide passage. The feeding mechanism includes a L-shaped member having a horizontally extending portion and a vertical portion extending upwardly therefrom. The L-shaped member is disposed with respect to the guide passage such that the horizontal extending portion extends through a continuous longitudinal gap in the strip and the vertically extending portion extends alongside the inner surface of the continuous wall of the strip defining the upper portion of the gap.

Abstract: A tool for use in rotating a nut threadedly received on a mediately disposed threaded portion of an elongate connector having a contoured outside end and the tool simultaneously holding the connector stationary. The nut in conjunction with the connector are adapted to facilitate the retention of the outside wheel rim of a dual rim self-aligning wheel rim to a brake drum. The tool comprises a motor for providing rotational motion when in a selected condition. A wrench assembly for engaging the nut so that nut may be rotated. A drive assembly for connecting the motor to the wrench assembly so that the wrench assembly rotates the nut when engaged thereto and when the motor is in its selected condition. An axially stationary holding assembly for engaging the contoured end of the connector so as to hold the connector stationary during rotation of the nut. The holding assembly includes a socket portion that engages the contoured end. The socket portion is completely contained within the wrench assembly.

Abstract: The loosening tool includes a U-shaped body with a bore in one of the legs thereof. A shaft is slidably located in the bore and carries a hammer at one end and a reciprocating hammer engaging means at the other end. The hammer and the other leg have surfaces that generally match the surfaces of interconnected threaded members which are to be loosened.

Abstract: A tool for installing fastening devices includes a casing having a handle portion, a body portion and a tip portion. A rotatable socket at the tip portion engages the fastener and screws it into the materials to be joined. A barb assembly engaging rod disposed within the casing is then extended out through the tip portion of the tool and depending on the type of fastener being used provides either impact or rotational motion to a plunger disposed within the fastener.

Abstract: An electric rotary power tool apparatus is adapted for loosening jammed or seized automobile wheel nuts or bolts and holdable by hand during operation. It comprises(1) an electric motor laid out to be driven by an electric direct current having an operational voltage of at least 8 to 30 volts and at least 20 up to 60 amperes, and comprising a stator, a rotor, first and second poles, and a driving shaft bearing said rotor and having a rotary axis, the speed of said motor, at a nominal voltage of 12 to 24 volts ranging from 8000 to 30000 r.p.m. under load;(2) a casing in which the motor is housed;(3) an on-off and reversing switch;(4) a tool socket being adapted for receiving a socket tool therein and comprising a driven shaft, the speed under load of which driven shaft is in the range of from 1200 to 4000 r.p.m.

Abstract: The powered ratchet wrench 10 is constructed of several components. A throttle lever 20 controls the air flow to a rotary air motor 30. The rotary output of the motor is transmitted to the hammer assembly 40 of an impact clutch mechanism. A spring 50 biases an anvil shaft 60 into association with the hammer assembly 40. The anvil can be directly driven by the motor through the hammer assembly or can be driven intermittently by a series of rotational impacts from the hammer assembly. The rotation of the anvil shaft causes the reversible ratchet mechanism 70 to rotate in the desired direction, thus tightening or removing a threaded fastener. Only a small reaction force is transmitted by the tool to the operator once the fastener is tightened.