Abstract: This invention relates generally to an impact tool. The present invention provides a vibration isolated impact tool wherein an impact mechanism and a motor assembly are arranged into a cartridge assembly. An elastomeric member resiliently connects the cartridge assembly with a housing. The cartridge assembly is free to move axially and rotationally within the housing. The elastomeric member absorbs axial vibration and torsional vibration, reducing the vibration transmitted to an operator.

Abstract: A hydraulic unit (1) includes a case (2) having an axially slidable top cap (11) at the rear end thereof. The hydraulic unit further includes a spindle (17) having communicating holes (28) axially formed therein and a column (19) which is inserted into the case. The column of the spindle includes a through-hole (29) formed therein and is rotatably supported by the top cap's closed-end hole (15). A pair of fluid chambers (25) and another pair of fluid chambers (26) are defined between the case and the spindle. The communicating holes (28) are capable of placing the fluid chambers (25) in communication with a bottom surface (16) of the closed-end hole (15) via the through-hole (29) when the fluid pressure in the fluid chambers (25) reaches or exceeds a threshold.

Abstract: A clutch-buffer assembly for power wrench comprises a driven wheel having an outwardly extended positioning tube disposed at a power-input end thereof. A retaining spring, a retaining disc, a driven gear, an anchor ring, and a reversible motor are collared onto the positioning tube sequentially, wherein the retaining disc is limited to move back and forth along the positioning tube without rotation; a pair of protruding teeth and reception cavities in respective contact faces of the retaining disc and the driven gear; and the reversible motor is used to drive the driven gear. When the driven wheel rotates at a higher speed, the retaining disc can be detached from the driven gear for control of the power consumption to lessen the imposed load in order not to blow the fuse, by this way the power wrench can generate larger output torque. Also, the retaining disc can be detached from the driven gear to alleviate the backlash caused by recoil of the driven wheel when impacting.

Abstract: In a hydraulic impulse screwdriver (1), a hammer (13) includes axial grooves (14) formed in the inner side wall thereof, and a spindle (11) includes V-shaped cam grooves (15) formed in the outer side wall thereof. A plurality of balls (16) are disposed in the space between the axial grooves and the opposing cam grooves. The screwdriver additionally includes a coil spring (17) for biasing the hammer (13) in a forward direction. The hammer is coupled to an anvil (19) by means of engaging recesses (18) of the hammer and engaging teeth (21) of the anvil so as to rotate integrally with the anvil. The anvil is firmly connected to a main body (24) of a hydraulic unit (23).

Abstract: A hand power tool has at least one safety coupling arranged in a drive train and having at least two coupling elements for transmitting a torque around a rotary axis, at lest one arresting element which is spring loaded and held in a guiding passage for connecting the coupling elements with one another, so that the coupling elements are at least disconnected in response to exceeding of predetermined torque, a spring providing spring-loading of the arresting element and supported in direction of the arresting element by the guiding element, and the guiding element being non rotatably guided relative to an axis extending parallel to the rotary axis by guiding surfaces in the guiding passage.

Abstract: An impact mechanism, such as an impact wrench is provided and includes a motor, a shaft rotatable about an axis and coupled to the motor and having a first shaft groove with first and second axial ends and a hammer disposed about the shaft and having a first hammer groove. A ball is disposed in the first hammer groove and in the first shaft groove and couples the hammer to the shaft for relative axial and rotatable movement, with the ball moveable along the grooves. The wrench also includes a rotatable anvil for coupling to a load, a bias member resiliently biasing the hammer axially into engagement with the anvil and stop structure disposed along the shaft for engagement with the hammer to limit axial movement of the hammer away from the anvil so as to prevent the ball from contacting the second axial end of the first shaft groove.

Abstract: An impact structure for an impact power tool comprises: a hammer body rotatable by means of a driving actuator, and having at least one pawl member having an impact contacting area; and an operation body for rotating a bit for the impact power tool, having at least one wing member having an impact contacting area, which can be brought into contact with the impact contacting area of the pawl member. The operation body is rotated by intermittently hitting the pawl member of the hammer body against the wing member of the operation body in a rotational direction of the hammer body. The impact contacting area of the pawl member can be brought into point-contact or line-contact with the impact contacting area of the wing member.

Abstract: A motorized screw driving tool including a motor adapted to generate a rotating force, an inertia wheel coupled to the motor and provided with power transmission assembly, and a spindle adapted to received power from the inertia wheel and provided with a power receiving member.

Abstract: A rotational energy storage device or spring which includes a roller-cam assembly having a shaft, a ring rotatably disposed about the shaft, and at least one roller disposed between shaft and ring. The roller is configured such that, upon rotating the ring relative to the shaft, the roller interferes with the ring and the shaft to convert and effect storage of mechanical energy created by the relative rotation of the ring and the shaft. Preferably a plurality of spaced rollers are positioned between ring and shaft. A cam geometry which is symmetrical or asymmetrical is provided on the shaft, the ring, the roller, and combinations thereof. A rotational energy storage device having a back-up ring with alternating thin and thick cross-sectional areas is further provided which is indexed to provide regions of low and high stiffness regions against each roller.

Abstract: A drive assembly for an electric hand tool uses a ratchet and two opposed, spring-loaded pawls. The ratchet is integrally formed as a dovetail flange on the tool shaft inside a hollow rotor. The pawls are asymmetrical and pivotally mounted inside a recess in the rotor such that the centrifugal force generated by the rotation of the rotor causes the appropriate pawl to engage the ratchet and rotate the tool in the appropriate direction. When the rotor stops rotating, the spring causes the pawl to disengage from the ratchet and return to a rest position. This drive assembly is advantageous in that it completely does away with the noise generated by the gears in the conventional drive assembly and is much cheaper and more convenient to repair.

Abstract: The present invention relates to an impulse wrench for use in conjunction with a fastener engaging tool and a power supply to selectively rotate threaded fasteners. The wrench comprises a housing and an impulse manifold rotatably mounted within the housing. An impulse piston is mounted inside a impulse piston receiving space for reciprocating movement and has an impulse delivering surface and a pressurizing surface. The piston and the piston receiving space are constructed and arranged such that the pressurizing surface and an outer end portion of the piston receiving space cooperate to define at least a portion of a high pressure chamber which is filled with a substantially incompressible fluid.

Abstract: An impact mechanism, such as an impact wrench is provided and includes a motor, a shaft rotatable about an axis and coupled to the motor and having a first shaft groove with first and second axial ends and a hammer disposed about the shaft and having a first hammer groove. A ball is disposed in the first hammer groove and in the first shaft groove and couples the hammer to the shaft for relative axial and rotatable movement, with the ball moveable along the grooves. The wrench also includes a rotatable anvil for coupling to a load, a bias member resiliently biasing the hammer axially into engagement with the anvil and stop structure disposed along the shaft for engagement with the hammer to limit axial movement of the hammer away from the anvil so as to prevent the ball from contacting the second axial end of the first shaft groove.

Abstract: A hammering screwdriver 1 for tightening and loosening screws offers the possibility of operating the rotating action alone when tightening the screws, and a rotation/hammering action when loosening the screws. This is primarily attained by the construction of the cam controller casing 2 between which and the hammering mechanism cage 6 a ball 10 is arranged. With this exclusively rotating motion, this ball 10 lies in a salient 16 below an elevation 8 on the head end 7 of the cam controller casing 2. With rotation/hammering motion, the ball 10 is moved over the track 3 to the head end 7 of the cam controller casing 7 until it reaches the elevation. Here the cam controller casing 2 moves forward in an axial direction owing to which hammering action occurs.

Abstract: Disclosed herein is an improved impact wrench structure comprising a reversible motor, a motor bracket, a hammer, driven wheel, a sealing adaptor, a transmission shaft, a clutch plate, two coil springs, and a set pin. The impact wrench according to the present invention has an improved largely simplified structure for facilitating manufacturing process and low cost, also is usable for replacing a flat tire on the way of driving by utilizing automobile power supply in stead of dragging the automobile to a repair shop for replacing the flat tire.

Abstract: A ratchet wrench for turning bolts and nuts disposed in narrow or inaccessible places. The ratchet wrench is rotatably attached to an end of an operation rod. The ratchet wrench comprises a weight attached to the operation rod, the weight being slidable lengthwise along the operation rod, the operation rod being provided at a portion thereof in front of the weight with a front weight receiving portion against which the weight is struck. Alternatively, the operation rod may be provided at a portion thereof in the rear of the weight with a rear weight receiving portion against which the weight is struck. Also, the operation rod may be provided with both the front weight receiving portion and the rear weight receiving portion.

Abstract: An impact mechanism having a rotating cage member that supports at least one hammer for imparting impacts upon an anvil. More particularly the present invention relates to a cage member of an impact mechanism wherein each hammer pin is supported in a partial bore hole in the end of the cage member closest to the motor of the impact mechanism.

Abstract: An air cylinder apparatus for a pneumatically driven power tool includes a unitary outer cylinder member, which has a bearing plate and a hollow cylindrical wall. A cylindrical chamber is formed eccentrically in the cylindrical wall. A bearing member is mounted removably on an end of the cylindrical wall. A cylindrical inner wall member is press fitted within the cylindrical wall of the outer cylinder member, and has two spaced adjacent axial sides that define an open-ended axial slot therebetween. The inner wall member can be compressed in a radial direction for removal from the outer cylinder member. Because the outer cylinder member is molded, the power tool can be manufactured easily and conveniently.

Abstract: The present invention relates an impact tool with a twin lobed anvil, and the separate anvil, timing shaft and mating dog hammer. The impact transmission is configured in such a way so as to maintain contact between the anvil and dog hammer. As a result, the components of the present invention provide a harder blow to the anvil of an impact tool due to a larger strike surface area, provide greater torque due to increased mass at engagement, and increase the durability of the impact tool.

Abstract: A cage device includes front and rear end plates respectively provided with front and rear major walls, and spaced apart from each other in a longitudinal direction. The rear major wall is in a splined connection with and driven by a drive output shaft of an air motor, and is formed with a pair of first pin holes which are diametrically spaced apart from each other. The front major wall is formed with an inserting hole for sleeving rotatably on a power output shaft, and a pair of second pin holes which are diametrically spaced apart from each other relative to the inserting hole. Opposite tilt and limit pins are provided with two first secured ends and two second secured ends respectively to be inserted into and in tight connection with, in the longitudinal direction, the first and second pin holes so as to define a space therein.

Abstract: The present invention relates an impact tool with a twin lobed anvil, and the separate anvil, timing shaft and mating dog hammer. The impact transmission is configured in such a way so as to maintain contact between the anvil and dog hammer. As a result, the components of the present invention provide a harder blow to the anvil of an impact tool due to a larger strike surface area, provide greater torque due to increased mass at engagement, and increase the durability of the impact tool.

Abstract: A pneumatically driven power tool includes a handle with air inlet and outlet passageways therein, and a transverse mounting housing. The mounting housing has a transverse circumferential portion with a rear abutment wall, a rear annular shoulder portion, an intermediate cylindrical wall segment, and a front annular shoulder portion. A rear bearing member and a rear mounting plate are inserted into the circumferential portion to abut respectively against the rear abutment wall and the rear annular shoulder portion, and are secured by a lockpin. A front mounting plate and a front bearing member are inserted into the circumferential portion to abut against the front annular shoulder portion and the front mounting plate, and are secured by another lockpin. A motor cylinder mates with the circumferential portion. A driven shaft is disposed in and is rotatable relative to the cylinder, and is journalled on the front and rear bearing members.

Abstract: A portable impact tool driver is removably attachable to a drive spindle or shaft of a conventional power tool. The impact tool driver has a body member with a drive shaft configured with the body member so as to be rotationally driven thereby. A hammer member is rotationally coupled to the drive shaft and is rotationally driven by the drive shaft. The hammer member is also axially movable along the drive shaft. The hammer has a first impact face configured thereon with at least two impact drivers defined on the impact face. A coupling drive mechanism is disposed between the drive shaft and the hammer member and imparts a rotational and longitudinal movement to the hammer member. An anvil member has a second impact face opposite the first impact face with an impact receiver configured thereon for periodic impacting engagement with the impacted drivers.

Abstract: The present invention relates to a motor for an air-tool. More particularly, the present invention is directed to an air driven motor in which the rotor has a plurality of recesses formed between each pair of adjacent vane holding slots. A separator fine is fixed in each recess. Each vane of the rotor is radially displaceable and outwardly biased to expose a compressed air contact surface area. The separator fins add additional compressed air contact surface areas.

Abstract: An electric wrench driving system, comprising a motor; a catching system; and a shaft. The catching system is driven by the motor in a rotational movement and further comprises a main body; a catching piece, mounted on the main body and oriented along the direction of the rotational movement, with a heavy end and a light end; a blocking rod; an eccentric arm; and a spring, pulling on the eccentric arm to fix the catching piece on the blocking rod below a threshold velocity of the rotational movement. The shaft has an insertion piece to be engaged by the catching piece for driving the shaft. When the threshold velocity of the rotational movement is exceeded, the eccentric arm releases the catching piece, and in a regular direction of the rotational movement the heavy end is pulled outward, with the light end engaging with the insertion piece of the shaft, driving the shaft.

Abstract: A pressure amplifier can be mounted above a drill bit at the lower end of a drill pipe for generating an increased fluid pressure in a drilling fluid flow to, for example, obtain an increased drilling effect, A reciprocating piston in a cylinder has at one side (a low pressure side) a large piston area and also has a first opposite piston area and a second opposite and relatively small piston area, which generates an increased pressure. A valve device controls drilling fluid flows to and from the piston. Beyond one end of the cylinder there is provided a hydraulic rotary motor adapted to be driven by the pressure difference between the drilling fluid flows in the drill pipe and an annulus. A transmission mechanism converts the rotation of the hydraulic motor into intermittent movements of the valve device between two operative positions.

Abstract: A tool head structure of power screwdriver, including an engaging clutch device for indirectly controlling the rotation of a driven member. The clutch device includes weight blocks which are subject to centrifugal force and thrown outward so as to indirectly press the leaf springs to further press the brake blocks. The brake blocks extend into an inner annular section of the rotary seat to drivingly engage with the driven member in the rotary seat. Therefore, when the rotary seat is coupled with a motor, at low rotational speed, simply the rotary seat is rotated. However, when the rotary seat reaches a certain high rotational speed, the weight blocks are subject to centrifugal force to indirectly press the brake blocks to drivingly engage with the driven member, whereby the driven member is rotated to tighten or untighten the screw.

Abstract: An impact tool driver is provided and configured for removable attachment to a drive spindle of a power tool, for example a conventional drill. A body member is removably attached to the drive spindle and includes a first impact member containing a number of radially spaced impact lugs defined thereon. Second impact member includes a number of radially spaced impact lugs in engaging and opposing contact with the impact lugs defined on the first impact member. A drive member is connected to the second impact member and is rotational mounted on the body member. The drive member includes a device for connecting a tool or working device thereto. Rotational drive of the body member and the first impact member is imparted to the second impact member and drive member through rotational impacting engagement of the impact lugs.

Abstract: Disclosed herein is an improved impact wrench structure, particularly an impact wrench for tightening and loosening fasteners for vehicle tires, it has a reversible motor as a power source to drive a drive wheel at a high speed so that flyweight sides of two hammers provided inside the drive wheel bound outwards by a centrifugal force.The knocking sides of the two hammers drop downwards, impacting and engaging with reception blocks of the transmission shaft and transmit output power to the transmission shaft. Such actions are repeated to perform the expected function of the novel impact wrench for tightening or loosening fastening components. The structure of the novel impact wrench of the present invention is more simple in construction, more practical in application, convenient in production and much saving cost compared to a conventional one.

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 centrifugal force-controlled coupling switch mechanism including a rotary base coupled between a reversible motor shaft of a reversible motor and an output shaft, an eccentric block pivoted to the rotary base and adapted for controlling engagement between the rotary base and the output shaft, a clutch adapted for controlling the engagement between the eccentric block and the output shaft, the clutch including a clutch body having two forward locating pins forced by a spring to disengage the eccentric block from the output shaft, and three smoothly curved actuating plates equiangularly retained to the clutch body by a spring retainer and forced by a centrifugal force to expand and to push the clutch body backwards in disengaging its locating pins from the eccentric block for permitting the eccentric block to be forced into engagement with the fixed coupling block of the output shaft by the centrifugal force when, the rotary base is turned with the clutch body by the reversible motor shaft of the reversible m

Abstract: A driving mechanism for a pneumatic tool includes a motor and an elongated connector. The motor has a body portion and a rotor shaft mounted rotatably to the body portion. The rotor shaft has an engaging section which extends beyond the body portion. The engaging section of the rotor shaft has an externally threaded portion adjacent to the body portion and a non-threaded portion which is connected to and which extends away from the externally threaded portion. The connector has first and second ends and an axial hole extending from the first end of the connector. The axial hole has an internally threaded section formed adjacent to the first end of the connector and a non-threaded section which is connected to the internally threaded section and which extends away from the first end toward the second end of the connector. The externally threaded portion of the rotor shaft engages threadedly the internally threaded section of the connector.

Abstract: A device for transmitting impulse-like blows to a continuously rotatable tool bit (6) is formed as an axially extending adapter (1) having a first chuck for the tool bit (6) and being insertable at a trailing end into a second tool bit chuck in a manually operated tool equipped with a striking mechanism. The adapter (1) has a housing (2) containing a unit for superimposing a second blow component on the first impulse blow component produced by the striking mechanism, so that an impulse-like drilling blow can be transmitted to the drill bit (6) made up of an axially directed blow component and a torsional blow component.

Abstract: A pulse tool, especially a nutsetter, comprises a pulse unit including a hydraulic cylinder driven by a motor, and a driven shaft supported in the hydraulic cylinder. Two seal rollers are supported in radial grooves of the driven shaft. The rollers are power-operated towards the inner wall of the cylinder. The seal rollers are simultaneously in contact only in a single rotary position of the cylinder with seal strips that project relative to the inner wall of the cylinder so as to produce an angular momentum. To simplify the structure of the pulse tool and to extend the period of use at the same time, the radial groove which receives the seal roller serving as a compensating roller comprises a lift delaying device for the limited centrifugal movement of the compensating roller.

Abstract: A hydraulic torque impulse generator having a drive member (10) with a fluid chamber (12) and an output spindle (11) extending into the fluid chamber (12) and being provided with a movable seal element (19) and an axial seal ridge (22) for cooperation with oppositely disposed axial seal lands (13, 14) in the fluid chamber (12) to, thereby, divide the fluid chamber (12) into one high pressure compartment (H.P.) and one low pressure compartment (L.P.) during a limited angular interval of relative rotation between the drive member (10) and the output spindle (11), and a valve means comprising an elongate contact element (24, 44) which is supported in an axial groove (23, 43) in the seal ridge (22 ), which groove (23, 43) communicates with the high pressure compartment (H.P.) such that the contact element (24, 44) is urged into its sealing condition by the fluid pressure at pressure magnitudes above a certain level.

Abstract: A torque transmission mechanism to be used in a power wrench includes a body driven by a motor, having a central bore to rotatably support therein a toothed end of an output shaft. The toothed end of the shaft has a pair of diametrically opposite teeth, each defined by two circumferentially opposite contact faces that extend along radii of the output shaft. The body has a radial notch communicating the bore with a coupling member pivotally received therein. The coupling member has two opposite wings alternately movable into the bore with the rotation thereof to selectively engage one of the teeth for driving the shaft. A centrifugal clutch is provided between the body and the motor to control the movement of the wings.

Abstract: A hydraulic torque impulse mechanism intended for a torque delivering tool and including a rotatively driven drive member (10) provided with a concentric fluid chamber (12) and radially acting cam elements (25, 26, 28), an output shaft (16) extending through the drive member (10) fluid chamber (12) and having two radial cylinder bores (18, 19) which communicate continuously with a central high pressure chamber (23) and support two piston elements (20, 21) which are reciprocable in the cylinder bores (18, 19) by the cam elements (25, 26, 28), whereby the output shaft (16) comprises two moderating chambers (45, 46) which communicate continuously with the high pressure chamber (23) and comprise a pressure responsive yielding system in the form of membranes (50) which are supported by end closures (47) of the moderating chambers (45, 46) and which are elastically deformable by the pressure difference between the high pressure chamber (23) and the fluid chamber (12) as this pressure difference is below a certain l

Abstract: A pneumatically powered torque impulse delivering tool for screw joint tightening comprises a housing (10) with a forward impulse chamber (11) enclosing a hydraulic impulse generator (15), a motor chamber (12) disposed rearwardly of the impulse chamber (11) and including a vane type air motor (19), and air inlet and outlet passages (26, 27) located at the rear end of the housing (10). The motor cylinder (20) is provided with radial air communication openings (37a,b, 38a,b, 39a,b) and outer grooves (37c,d, 38c,d, 39c,d) forming passages for connecting the openings (37a,b, 38a,b, 39a,b) to the air inlet and outlet passages (26, 27).

Abstract: An economically and technologically improved assembly for developing kinetic energy in a rotary impact tool. There is disclosed herein a two-part, readily assembled and disassembled pin cage-coupler. One part, a cylindrical, longitudinally grooved cage, which contains a clutch mechanism, is capped at one end by a lobed end plate coupler. Since there is no physical bonding during the functional life of these parts, they may be made separately by various metal working technologies, including sintering and forging.

Abstract: An electrical wrench includes a motor and a drive shaft driven by the motor. A transmission body is mounted on the drive shaft for rotating synchronously therewith and has an accommodating space. A wrench shaft has a follower member extending into the accommodating space. A swing member has an axial positioning protrusion and is pivoted within the accommodating space about an axis offset and parallel to the axis of rotation of the transmission body. The swing member can swing to an engaging position with the follower member to transmit rotation when the transmission body is rotated to a high speed. A shoe assembly is biased to clamp the swing member to disengage the swing member from the follower member and releases the swing member to the engaging position by virtue of the centrifugal force induced at the high speed of the transmission body.

Abstract: A power wrench includes a housing inside which an electric motor is mounted. A torque/rotation transmission mechanism is also disposed inside the housing to be coupled to the motor to drive a driving tip thereof extending out of a front end of the housing for engagement with a bolt/nut to be loosened or tightened. The transmission mechanism includes a cylindrical main body with a cylindrical projection concentrically integral therewith to connected to the spindle of the motor so as to transmit rotation to the main body. A coupling member is pivotally mounted on the main body and controlled by a centrifugal clutch to intermittently hit an output shaft along a circumferential direction to apply a torque impulse to the output shaft for loosening or tightening the bolt or nut. A lamp is provided on the front end of the housing to project a light beam to the bolt or nut to allow the operator to monitor the operation of the power wrench in a dark environment.

Abstract: A power screwdriver disclosed includes a housing, a reversible motor, a screw-driving device, a transmitting shaft, and a handle. The screw-driving device includes a centrifugal clutch, a rotor and an engaging set. The shaft is connected to the motor at one end and to the rotor at the other end so as to transmit rotating power from the motor to the rotor. The screwdriver automatically switch screwing actions in accordance with the rotating speed thereof.

Abstract: In an open state of a valve, when a valve outside sleeve is rotated in the rear portion of a housing, a valve inner sleeve is moved forward to close a fluid channel, thus stopping supply of compressed driving air. Simultaneously, a front end of the valve outside sleeve is moved forward while it abuts against the rear surface of a retainer. Therefore, brake rods biased by compression coil springs are also moved forward, and front surfaces of the brake rods are abutted against a brake disk to effect braking, thereby immediately stopping rotation of a rotor. The urging force applied on the brake disk is the compression force of the compression coil springs.

Abstract: A hydro-impulse screwing device comprises a rotary drive motor, a power source for the motor, a drive shaft, a pulsating hydraulic drive connecting the motor to the shaft and a power cut-off for the motor. The load at which the power cut-off functions is adjustable. The tool has a borehole extending through the length of the shaft, a conduit for conducting hydraulic fluid from the drive to the borehole, a valve in the borehole movable from a closed position to an open position in response to hydraulic pressure corresponding to a predetermined load to allow hydraulic pressure from the drive to actuate the power cut-off, a biassing element in the borehole for biassing the valve toward a closed position against the hydraulic pressure, wherein the force of the biassing element is adjusted at the end of the drive shaft to change the load at which the power cut-off operates.

Abstract: This invention relates to a rotary impulse screwing device which generates only one pulse per rotation of the output shaft. Two main and two additional lamellas are adjustably positioned in the output shaft. The two main lamellas seal at a minimum of two times per rotation of the output shaft. The two additional lamellas are adjusted independently via separate recess tracks to ensure that each additional lamella seals at only one point per rotation of the output shaft. The independently articulated additional lamellas further ensure that the load on the output shaft bearing is symmetrical on non-impulse points of rotation.

Abstract: A reversible powered impact wrench is provided wherein improvements are incorporated in the detenting of the reverse direction valve, venting of excessive air pressure within the impact wrench motor housing which may use light weight material due to improved clutch and camming means and wherein an improved one piece anvil-timing shaft is designed to be supported by the impact wrench hammer and rotor.

Abstract: A torque impulse power tool primarily intended for tightening threaded joints comprises a housing (10), a rotation motor (11), a torque impulse generating mechanism (13), and a reduction gearing (12) coupling the impulse mechanism (13) to the motor (11). A torsion spring (21) is associated with the reduction gearing (12) to reduce substantially the difference in deceleration between the motor (11) and the impulse mechanism (13) by yielding elastically to the driving and inertia forces of the motor (11) and the gearing (12) during each impulse generation. The torsion spring (21) is connected to absorb the reaction torque peaks developed in the gearing (12) or the driving torque peaks between the gearing (12) and the impulse mechanism (13).

Abstract: The fatigue-resistant spindle end of the invention is an elongated body having an axis of rotation. The spindle end comprises a drive engaging portion at one end, a male tool engaging tang at the other end, and a torque transfer section disposed therebetween. The torque transfer section includes a cylindrical journal portion and a frustoconical transition portion. The transition portion retains the geometric characteristics of both the tang and the cylindrical journal portion and blends those geometric characteristics so as to eliminate sharp discontinuities which may function as stress concentrators. In one embodiment of the invention, a stop barrel is also included to prevent a socket or other tool from engaging the transition portion.

Abstract: An impact screw driver includes a tubular handle, an impact rod slidable axially within the handle, and a handle cap mounted detachably on the top end of the handle. A driving rod rests on the top end of the impact rod and has an open top end and a lower end spring seat, on which a torsion spring is provided to bias a driving head to move upward. The impact rod and the driving rod are both guided to move axially in the handle. A sleeve head connects a tool bit to the driving head. A compression spring is sleeved on the driving head and placed over the driving rod so as to bias the driving rod and the impact rod to move downward. A ball is retained on the wall of the driving rod. A cam slot is formed in the driving head so as to receive the ball slidably in the cam slot. The cam slot is shaped so as to convert axial movement of the driving rod into rotational movement of the driving head.

Abstract: An oil pressure type impulse torque generator for a wrench. Either one of both seal surfaces on the main shaft side and the liner side is made a variable type by floating in order to eliminate "burning" and wear at the seal surfaces. The seal surfaces may be formed by rollers.