Abstract: A motorized screw bolt driving tool includes a centrifugal element to drive a brake socket to disengage from a swivel element permitting a brake element to swing in a notch on the swivel element so that a spindle can be driven by a motor to rotate clockwise or counter-clockwise for turning a screw bolt or nut.

Abstract: An improved pneumatic impact imparting tool includes a follower which is slidably accommodated in a recess formed on the inner end part of a rotor in a pneumatic motor. The follower is formed with a projection for moving a ball around a cam face as it is rotated together with the rotor. When the ball reaches the peak of the cam face, the follower is displaced in the axial direction and enters a recess formed on the inner end part of an anvil and collides therein against stoppers formed in the recess. Thus, rotational movement of the rotor is transmitted to the anvil in the form of intermittent turning movement of the latter.

Abstract: A striking tool device formed of a cylindrical metal shaft having, at one end, a square bore for mating with the drive tang of a ratchet wrench and, at the other end, a square shank for mating with a socket, and an arm member attached to said cylindrical metal shaft extending substantially at right angles thereto. The arm member has an anvil-like end portion of slightly larger diameter. The end portion has two flat striking surfaces on opposite sides for allowing striking by a hammer. Such striking creates a sufficient shock impulse to loosen a "frozen" nut or bolt.

Abstract: The present invention provides an axial flow boltrunner eliminating the side feeding previously required in prior boltrunners. An embodiment of the present invention also provides a boltrunner which can be quickly changed to torque a plurality bolts of different sized heads without extensive modification.

Abstract: An improved pneumatic impact imparting tool includes a follower which is slidably accommodated in a recess formed on the inner end part of a rotor in a pneumatic motor. The follower is formed with a projection for allowing a ball to come in contact with a cam face as it is rotated together with the rotor. When the ball reaches the top of the cam face, the follower is displaced in the axial direction and enters a recess formed on the inner end part of an anvil to collide against stoppers in the recess. Thus, rotational movement of the rotor is transmitted to the anvil in the form of intermittent turning movement of the latter.

Abstract: An impact wrench has a casing accommodating rotatable anvil and shaft, the shaft supporting a hammer having a body with longitudinally extending passages in which pins are received for axial reciprocations which pins are engaged with the anvil in one position. A driving member received in an axial passage of the hammer body is coupled to the shaft to perform rotation and axial movement, the driving member being connected to the hammer body for rotation together therewith, and cooperating with a spring for moving the pins into a position, in which they are engaged with the anvil. The longitudinally extending passages open into the axial passage of the hammer body. Each pin has a bearing surface engageable with a respective bearing surface of the driving member during movement of the pins into the other position, the bearing surface being located on a portion of each pin protruding into the axial passage of the hammer body.

Abstract: A tool for loosening fasteners, comprises an applicator bar formed with a socket for receiving the fastener to be loosened, a handle fixed to a housing rotatable about the applicator bar for loosening the fastener received in the socket, a hammer within the housing and connected thereto by a spring, and an anvil carried by the applicator bar. The tool further includes a rod coupling the anvil to the hammer in the initial position of the hammer and effective to prevent relative movement therebetween, and thereby to load the spring during the rotation of the operating handle in one direction, and a releasing device effective, after the operating handle has been rotated a predetermined distance, to release the coupling rod, whereby the loaded spring causes the hammer to impact against the anvil to thereby loosen the fastener received in the socket of the applicator bar.

Abstract: A hydraulic torque impulse tool, comprising an inertia drive member (10;110) which is rotated by a motor and which includes a fluid chamber (19;119), and a seal and torque transmitting mechanism (30;130) which is arranged to divide the fluid chamber (19;119) into two compartments (38, 39; 138, 139) during a short interval of the relative rotation between the drive member (10;110) and the output spindle (11;111). A leaf spring valve (72; 171, 172) is arranged to control the flow through a bypass passage (70;170) interconnecting the two fluid chamber compartments (38, 39; 138, 139). The leaf spring valve (72;171, 172) which by its shape is pretensioned toward open condition automatically occupies the open condition as the difference in pressure between the fluid chamber compartments is low and a closed condition as this difference exceeds a certain level.

Abstract: Hand held tool for applying a rotational impact to a fastener. Means including a windable spring are mounted on the tool body for storing energy, which can be release and transmitted mechanically to other means engaging the fastener, to apply a rotational impact force to the fastener. The tool is useful for small fasteners and delicate workpieces, where the rotational impact should be applied with little or no axially-directed thrust force component.

Abstract: A hydraulic torque impulse tool, comprising an inertia drive member (10) which is rotated by a motor and which includes a fluid chamber (19), and a seal and torque transmitting mechanism (30) which is arranged to divide the fluid chamber (19) into two compartments (38, 39) during a short interval of the relative rotation between the drive member (19) and the output spindle (11). An annular leaf spring valve (82) is arranged to control the flow through a bypass passage (70,81, 79) interconnecting the two fluid chamber compartments (38, 39). The leaf spring valve (82) which by its shape is pretensioned toward open condition automatically occupies the open condition as the difference is pressure between the fluid chamber compartments (39, 39) is low and a closed condition as this difference exceeds a certain level.

Abstract: Structural improvement of electric screwdriver with respect to the torsion adjustment thereof, incorporating a torsion mechanism having outer threads in the anterior shell in coordination with a hollow-set torsion adjustment lid having correspondingly provided inner threads, so that manually imposed rotative feeding of the adjustment lid may force the supporting stem to exert depression on the depression spring through the adjustment disk, resulting in vertical engagement of both the upper and the lower ratchet, also in mortise joint of the torsion stem with the lower ratchet; that activation of a finely-touched switch starts the motor to acquire an increased torque by virtue of the main gear in relation to the vernier gear, eventually setting the torsion stem to rotation while locking the screw or else releasing the same, the torsion adjustment lid permissive of multiple-shifted helic adjustments with precision and convenience. The motor being smooth in running, thereby shortens time and labor in work.

Abstract: A rotary impact lug tool includes a shaft, a rocker stop block assembly and an elongated rotary member. The shaft includes a socket extension to engage a lug nut. The rotary member is centrally mounted for relative rotation on the shaft. The rocker stop block assembly includes two flat oblong plates fixedly mounted on the shaft in parallel relationship normal to the shaft. Two diametrically opposed stop blocks are affixed to and sandwiched between the plates at equal predetermined radii from the shaft. The rotary member is housed between the plates. Upon spinning, the rotary member simultaneously strikes parallel planar impact surfaces of both stop blocks. The resultant angular impulse is transferred through both plates of the rocker stop block assembly to the shaft, thereby loosening the nut.

Abstract: The invention relates to a turning mechanism for driving in or extracting piles by means of tangential rotary blows being imparted by a rocker arm equipped with balance weights and arranged in a rotary manner relative to the pile. In order to render superfluous the hitherto necessary noise-damping, additional damping means, damping members made from an incompressible, elastic material are used, which are placed in recesses in at least one stop of a pair of stops in such a way that there is a deformation, particularly at right angles to the impact direction, which is within the elastic limit of the member and prevents direct contact between the stop pairs. These members are arranged on all parts of the rocker arm which, in operation, form noise sources.

Abstract: An impact screw driver which includes two changeable coupling ends of variable sizes to be inserted into differently dimensioned coupling sleeve heads of the tool bits, thereby facilitating the manufacture of the device.

Abstract: An impact wrench for using fastening or unfastening fasteners comprises a cylindrical rotor coupled to a motor shaft, said cylindrical rotor including a projection on its inner surface, the projection having a circumferential width and an axial length; an anvil coupled to said cylindrical rotor, the anvil including a hammer member capable of rocking therein, the hammer member being engageable with said projection; a springloaded pusher for urging said hammer member towards said projection, wherein a spring support slides either on a deep cam face or a shallow cam face both produced on said inner surface of the cylindrical rotor, thereby allowing said spring to become compressed or relaxed against said hammer member.

Abstract: In a hydraulic torque impulse tool having a power rotated inertia drive member (10; 110) and a hydraulic fluid chamber (19; 119) a piston (30; 130) is supported in the fluid chamber (19; 119) for reciprocating movement in a plane transverse to the rotation axis of the drive member (10; 110). The piston (30; 130) and the output spindle (11; 111) are provided with cam means (42, 43, 44; 142, 143, 144) by which the piston (30, 130) is reciprocated in the fluid chamber (19; 119) at relative rotation of the drive member (10; 110) and the output spindle (11; 111) of the tool. The piston (30; 130) and the fluid chamber (19; 119) have seal means (31, 28; 131, 128) by which one fluid chamber compartment (38; 138) is sealed off from another (39; 139) during a certain portion of each piston stroke, thereby accomplishing an instantaneous pressure build-up in one of the fluid chamber compartments.

Abstract: An impact wrench includes a hammer, an anvil and a rotor driven by a motor, the hammer being swingeable in either direction with respect to the rotary axis of the rotor, the hammer resting on the anvil in a spring-loaded state so as to enable the hammer to line up with the axis of the anvil, the hammer including means for engaging itself with the inside surface of the rotor, whereby the hammer produces impacts at fixed intervals and transmits the same to the anvil.

Abstract: An impact wrench comprises an anvil having impact jaws, a composite hammer including a driving part coupled to an output shaft of a pneumatic motor and a driven part having impact jaws for co-operating with the impact jaws of the anvil and mounted in the driving part for a combined rotation and a relative axial movement. A diametrical slot is provided in the driving part to receive a slider having its center of gravity offset relative to the hammer axis. The anvil receives a stub shaft mounted for a combined rotation together therewith and a relative axial movement and having a spring-loaded locking member co-operating with the slider. This construction of the pneumatic impact wrench enables a greater amount of kinetic energy to be transmitted into a threaded joint with each blow so as to improve the efficiency and reduce vibrations.

Abstract: The rotary impact mechanism has a plurality of helical springs disposed adjacent to the outer peripheral surface of a rotary inertia member which springs are anchored at one end to the inertia member and at the opposite end to a rotary driving input member so that upon relative rotative movement between the input and inertia members the springs are loaded and thereafter function to rotatively drive the inertia member. The inertia member carries at least one pawl which is capable of engagement and disengagement from a driven, toothed, output member, the pawl impacting against a tooth of the output member to drive the latter when the inertia member is rotatively driven by the springs.

Abstract: In a rotary impact mechanism which has input, output and inertia members substantially symmetrical and journaled about each other for independent angular movement about a common axis and a pawl and ratchet assembly for interconnecting the input and output members for torque transmission, the pawl spring assembly for biasing the pawl in a direction to engage the ratchet comprises a plurality of spring elements formed into a unitary structure and arranged with respect to the pawl to sequentially engage and load the pawl as the pawl is moved in a direction to disengage from the ratchet.

Abstract: An excavator for excavating a tunnel is provided which has a body provided with gathering and transporting means for the materials excavated by the excavator for discharging the same. The excavator comprises a horizontally and vertically swingable boom mounted on the body and actuated by a cylinder-piston assembly interconnected between the body and the boom. A vertically tiltable excavating cutter is tiltably mounted on the forward end portion of the boom with or without a vertically swingable bracket actuated by a cylinder-piston assembly which is interposed between the cutter and the boom. An impact motor is adapted to intermittently actuating the cutter. An extensible and retractable boom actuated by a cylinder-piston assembly may be interposed between the bracket and the horizontally and vertically swingable boom.

Abstract: An impact wrench that may be used in various industries for tightening threaded fasteners. In the impact wrench, a hammer and an anvil are coaxially mounted in a space relationship and axially movable with respect to each other. The impact wrench is provided with a device for effecting said relative axial movement of the hammer and anvil for engagement of their impact jaws, and a device for interaction of the hammer and anvil prior to the engagement of their impact jaws.In the impact wrench, the hammer and anvil jaws are engaged over the entire height, whereby the wear of the jaws is considerably reduced, the energy of a single blow is increased, vibration as lowered and torque tightening is ensured.

Abstract: An impact wrench is described as having a short spindle with means on one end to engage a threaded object to be turned, such as a bolt securing an automobile wheel in position, with a moment arm pivotally mounted at the other end of the spindle. A linear weight guide is rigidly mounted on this arm at a right angle thereto at the end opposite the pivot. A weight embraces the guide and is easily slidable thereon so that the spindle-mounted wrench means may be engaged with the object to be turned, after which the moment arm may be swung about the pivot connection to a position where the weight slides along the guide, after which stop means at either end of the guide will cause the weight to stop suddenly responsive to resistance of the threaded object so as to apply an impact to the object at right angles to the axis of the threads.