Abstract: A hand power tool has a tool, a hammer tube, a striking mechanism with a striker and an anvil with an integrated receptacle for the tool which is strikingly drivable in the receptacle, a blocking element connecting the tool and the anvil in an axial direction, and a toothing that connects the anvil with the hammer tube displaceably in an axial direction.

Abstract: A torque control system for electrically driven rotating tools capable of always properly and efficiently effecting constant-torque tightening of screws or the like and capable of easily achieving the miniaturization of the whole device and the improvement in torque control accuracy, the torque control system comprising a clutch mechanism that, when a load torque of predetermined value or above acts on a driven shaft joined to the output shaft of an electric motor, operates to cut off the engagement between the output shaft and the driven shaft, a torque setting mechanism that adjusts the engagement point for the clutch mechanism, and a torque detecting mechanism (42) for detecting the clutch operation of the clutch mechanism to effect drive stop control of the electric motor, wherein the torque detecting mechanism (42) is set so that it effects drive stop control of the electric motor simultaneously with the detecting operation thereof in a state in which the clutch operation has been completed as the cam en

Abstract: A vibrating drill/driver includes a motor for driving a spindle about the longitudinal axis thereof, a switching handle supported for rotation about a longitudinal axis thereof, a clutch mechanism for varying a working torque in dependence on rotation of the switching handle, a switching ring having a recess and capable of rotating together with the switching handle, and a switching plate having a tip for engagement in the recess. A vibrating cam mechanism is provided to be operable to undergo a slidable engagement to provide a vibration for the spindle in an axial direction thereof when the tip of the switching plate is engaged in the recess of the switching ring. With the above-described construction, the rotation of the switching handle in one direction causes the vibrating drill/driver to be set in one of a clutch mode, a vibrating mode, and a drilling mode in this order.

Abstract: The present invention relates to a power drill which comprises a spindle and a rear bearing mounted on the rear portion of the spindle. A fixed gear wheel is connected to a gearbox and a movable gear wheel is connected to the spindle. An adjustment member is provided on the front portion of the spindle. The adjustment member comprises an adjustment cover, an adjustment fork connected to the adjustment cover and a sleeve connected to the adjustment fork and mounted on the front end of the spindle. On the sleeve is provided a groove. A stroke adjustment member on which is provided a protruding block is disposed between the movable gear wheel and the sleeve. A stopper whose radial dimension is greater than the spindle is disposed on the front portion of the spindle. A plane bearing is disposed between the front end of the sleeve and the rear end of the stopper and is provided with a retainer for receiving a rolling element.

Abstract: An overload protection arrangement for a portable power tool includes a magnetic clutch (5) arranged in a drive train of the power tool between an electromotor (1) and a tool chuck (3), control electronics (6) for controlling the magnetic clutch (5), a self-actuated torque-dependent overload clutch (7) likewise arranged in the drive train, and a sensor (8) for detecting an open condition of the overload clutch (7) upon the overload of the drive train and connected with the control electronics (6).

Abstract: A clutch assembly for limiting a torque output of the power tool. The clutch assembly includes an annular rotatable clutch member, which is coupled to the ring gear of a planetary gearset in a transmission, and an engagement assembly. The clutch member has a clutch face with a predetermined clutch profile. The engagement assembly has at least one follower member that abuts the clutch member and cooperates with the clutch profile to inhibit rotation of the clutch member relative to the follower member only when the magnitude of the torque output of the power tool is less than a predetermined maximum torque. The clutch face on the clutch member is located between the opposite axially ends of the ring gear.

Abstract: A vibrating drill/driver includes a motor for driving a spindle about the longitudinal axis thereof, a switching handle supported for rotation about a longitudinal axis thereof, a clutch mechanism for varying a working torque in dependence on rotation of the switching handle, a switching ring having a recess and capable of rotating together with the switching handle, and a switching plate having a tip for engagement in the recess. A vibrating cam mechanism is provided to be operable to undergo a slidable engagement to provide a vibration for the spindle in an axial direction thereof when the tip of the switching plate is engaged in the recess of the switching ring. With the above-described construction, the rotation of the switching handle in one direction causes the vibrating drill/driver to be set in one of a clutch mode, a vibrating mode, and a drilling mode in this order.

Abstract: In a hand-guided percussion drilling machine an arresting coupling non-rotatably coupling a drilling spindle relative to a machine housing is arranged on an intermediate shaft rotatably connected with the drilling spindle and extending parallel to and at a radial distance from the drilling spindle and at a radial distance from the motor shaft, wherein the arresting coupling openings during a torque transmission from a drive motor to a tool holder in one direction and closes during a torque transmission from the tool holder in an opposite direction.

Abstract: The present invention relates to a power drill which comprises a spindle and a rear bearing mounted on the rear portion of the spindle. A fixed gear wheel is connected to a gearbox and a movable gear wheel is connected to the spindle. An adjustment member is provided on the front portion of the spindle. The adjustment member comprises an adjustment cover, an adjustment fork connected to the adjustment cover and a sleeve connected to the adjustment fork and mounted on the front end of the spindle. On the sleeve is provided a groove. A stroke adjustment member on which is provided a protruding block is disposed between the movable gear wheel and the sleeve. A stopper whose radial dimension is greater than the spindle is disposed on the front portion of the spindle. A plane bearing is disposed between the front end of the sleeve and the rear end of the stopper and is provided with a retainer for receiving a rolling element.

Abstract: A portable power tool comprising a rotation motor (11), an output shaft (14), a gearing (13) and a drive spindle (12;112) connecting the gearing (13) to the motor (11), wherein a drive line arresting lock device (17; 117) is provided to facilitate loosening and/or tightening of a working implement mounting device (15), and a releasable safety clutch (23; 123) is provided between the lock device (17; 117) and the gearing (13) for protecting the gearing—(13) against transmission of detrimental excessive torque magnitudes manually applied on the output shaft/mounting device (14, 15).

Abstract: The invention is based on a hand power tool having a tool mount capable of being driving in an at least rotating fashion via a drive motor and a drilling spindle (13), which said tool mount comprises a clamping device for securing tools that is capable of being operated in the direction of rotation of the drilling spindle (13), and having an arresting mechanism (38), via which the drilling spindle (13) can be coupled in torsion-resistant fashion relative to a part (27) of the machine housing (26) to tighten and loosen the clamping device of the tool mount (12), and which opens automatically when torque is transferred from the drive motor to the tool mount (12) and locks automatically when torque is transferred from the tool mount (12) to the drive motor. The arresting mechanism (38) is located on an intermediate shaft (17) and combined with a safety clutch (58) that is also located on the intermediate shaft (17) (FIG. 2).

Abstract: An engine-powered torque wrench (18) has a loop handle (19) that is orthogonal to a torque rod (22) of a torque handle. The engine-powered torque wrench has a heat engine (1) which rotates a toolhead (14) to which selected tools (25) or a striker gear (16) which can hold the selected tools is attachable. The loop handle is adapted to be hand-grasped by a first hand of a user for primary support of a system weight of the engine-powered torque wrench while selectively positioning a selected tool on a targeted item (23) which typically but not necessarily includes a fastener head (24). The torque handle is adapted to be hand-grasped by a second hand of the user for secondary support of the system weight while simultaneously using the second hand for assisting in positioning of the selected tool, leveraging against rotational moment of the tool heat engine and throttling heat engines which are not preset-throttled.

Abstract: The present invention relates to an electric wrench for vehicle repairing which comprises a DC driving motor, transmission gears, a clutch, a power accumulator and a transmission shaft. When the DC driving motor rotates, it will drive the transmission gears which will in turn drive the power accumulator to rotate with high speed. The power accumulator will drive the clutch to rotate. When the power accumulator reaches the pre-set high speed, it accumulates sufficient inertial force. Owing to centrifugal force, the clutch will make a hammer block to impact a hammer inside the power accumulator, thus driving the transmission shaft to rotate suddenly. The electric wrench is with simple structure and can generate high output torque without producing reaction torque and angular force.

Abstract: This invention relates to the design of a pin clutch to allow for coupling of a rotational shaft to an output mechanism in a synchronous fashion. Specifically, this is related to impacting or operations requiring intermittent or semi-intermittent coupling of an input mechanism or shaft to an output mechanism or shaft. Devices of this nature include fastening tools, throwing mechanisms and other devices in which input energy is built up during a portion of a cycle followed by the coupling and release of that energy to an output mechanism.

Abstract: A portable tool comprising a spindle defining a longitudinal axis, a spring extending around the spindle in the axial direction for biasing a component of the tool, a stop ring extending around the spindle and against which the spring bears. The spindle includes a plurality of circumferentially spaced radially outward projections and the stop ring includes on its internal surface a corresponding plurality of recesses extending from the bearing face of the stop ring to an opposite face, and a corresponding plurality of pockets open at the opposite face. During assembly, the stop ring is fitted over the spindle or sleeve by the passing the recesses over the projections and then rotating the stop ring to align the pockets with projections. The stop ring is axially fixed on the spindle by the pockets engaging the projections under the biasing force from the spring.

Abstract: In an electric power tool having a clutch ring for adjusting a fastening torque, an outer member 3 which are lower in hardness than a base member 2 of the clutch ring 1 has a plurality of projections discontinuously arranged on the outer peripheral face of the base member 2.

Abstract: A screw driving tool comprises a housing (1), a drive (2), a drive spindle (3), a torque coupling (4) between the drive (2) and the drive spindle (3), as well as an adjustment mechanism disposed between the free end of the drive spindle (3) and the torque coupling (4), the adjustment mechanism is used for adjusting the torque transmitted using the torque coupling (4). The adjustment mechanism has at least one prestressable spring element (5) cooperating with the torque coupling; a compression sleeve (6) that is displaceable parallel to the axis of the drive spindle (3) and cooperating with the spring element (5); a control sleeve (7) arranged coaxially with the compression sleeve (6) and cooperating with the compression sleeve (6); a rotatable adjustment sleeve (8), and a plurality of rotationally mounted planet wheels (10) cooperating in a form locked manner with the control sleeve (7) and inner teeth (9) of the adjustment sleeve (8).

Abstract: A method and a power wrench for detecting the attainment of a target torque level in a screw joint tightening process are provided, wherein an override type torque responsive release clutch is used in the power wrench for defining the target torque level. A microphone is mounted in the power wrench for recording “click” sound(s) developed in the clutch during the release movement of the clutch, and a control unit including a signal identifying device is provided for recognizing the release “click” sound(s) and delivering a stop signal for interrupting the power supply to the motor and/or braking the motor as the clutch is released and the target torque level is achieved.

Abstract: An electrical hand-held power tool including a pinion (4) for driving a gear set that transmits a rotational movement to a power tool spindle, a pinion shaft (10) for supporting the pinion (4), an electric motor (2) for generating a torque, a rotor shaft (11) connected with the electric motor (2) for transmitting the torque to the pinion shaft (10), and a safety clutch (5) provided between the pinion shaft (10) and the rotor shaft (11), with the pinion shaft being formed as a hollow shaft provided in its interior with inner bearing which rotatably supports the pinion shaft (10), and with the rotor shaft (10) having its end received in the interior of the pinion shaft (10) and supported against the inner bearing.

Abstract: An electrically powered rotary hammer comprising a rotary drive mechanism including a spindle drive gear rotatably mounted around the spindle for rotationally driving the spindle, or a part of the spindle, via an overload clutch. The overload clutch is arranged such that below a predetermined torque threshold a spring element or elements maintain(s) the spindle drive gear and a clutch ring in a relative rotational position in which the spindle drive gear locks locking member or members in a first position and such that above the torque threshold the spring element or elements deform(s) and the relative rotational position of the spindle drive gear and a clutch ring changes so that the locking member or members move(s) out of the first position.

Abstract: A gear transmission assembly for an electrical power tool includes a housing (6), a multi-stage gear train (1) located in the housing and having a plurality of axially displaceable indexing gears (4a, 4b) associated with respective stages of the gear train (1) and a shift device (2) for shifting the gear train (1) from one stage to another and having a shifting slide (3) displaceable from one shift stage to another, and a plurality of springable shifting stirrups (5a, 5b) connected with the shifting slide (3) and cooperating with respective indexing gears (4a, 4b) for displacing same in response to displacement of the shifting slide (3) between shift stages.

Abstract: A hand-held rotary-percussion power tool includes an electrical drive (2) for generating a torque transmittable to a boring tool used with the power tool for forming blind bores, a hammer mechanism (3) for applying impacts to the boring tool, control device (7, 7′, 7″) for controlling operation of at least one of the electrical drive (2) and the hammer mechanism (3), and an electronic depth stop (4). The depth stop include a sensor (5) for contactless, distance measuring of a depth of a blind bore, and a computation unit (6) for generating a signal indicating that a sensed measurement value (M) corresponds to a set value of the depth of the blind bore, and connected with the control device (7, 7′, 7″).

Abstract: A clutch arrangement for a power tool having a multi-speed transmission. The clutch arrangement includes a clutch member and a follower member. The clutch member is coupled to a member of the transmission that is proximate the torsional input of the transmission and which must be in a non-rotating position to permit the transmission to perform a torque multiplication operation. The follower member is biased into engagement with the clutch member to inhibit relative rotation therebetween. As the clutch member and the transmission member are coupled to one another, the transmission is able to perform a torque multiplication operation. When, however, the torsion that is exerted onto the clutch member is sufficient to overcome the frictional engagement between the follower and clutch members, the clutch member, and the transmission member, rotate, thereby inhibiting the capability of the transmission to continue to perform the torque multiplication operation.

Abstract: A drill/driver is provided that includes a housing, a collar mounted at a front portion of the housing, a side handle mounting area provided forward of the collar, a handle mounted to the side handle mounting area, and a chuck mounted forward of the side handle mounting area. With the side handle mounted in front of the collar, easier access to the adjusting collar and easier reading of the collar settings is achieved.

Abstract: Disclosed and taught is a novel drive mechanism for a cyclic operating tool employing an energized flywheel to provide the necessary energy to perform a working cycle. The drive mechanism disclosed is particularly useful in hand tool applications such as a hand held nailing machine. The flywheel may be energized by a corded or battery powered motor. The herein disclosed mechanism teaches a novel pair of ball ramp cam plates wherein a first pair of ball ramps cause an initial engagement of a clutch with the energized flywheel whereupon rotation of the clutch causes activation of a second pair of ball ramps which affect compression of a spring which acts to increase the pressure applied to the clutch thereby assuring a slip free engagement between the clutch and he flywheel throughout the working cycle of the drive mechanism.

Abstract: A power nut runner with a torque responsive shut-off capacity includes a housing (11,12,13), and a rotation motor (10) connected to an output shaft (28) via a torque responsive release clutch (26) in which torque is transferred via a cam mechanism (31, 35, 36) between a driving clutch half (25) and a driven clutch half (27, 30, 39). A spring (32) is arranged to bias and displace a first one of the clutch halves (27, 30, 39) towards the other in an engagement direction, and a signal emitting release detecting sensor (46), is provided in the housing (11, 12, 13). An activation element (40) is arranged to be thrown off an abutting contact with the spring biassed clutch half (27, 30, 39) to reach an active position beyond its inactive low torque position as the spring biassed clutch half (27, 30, 39) is abruptly returned to its engagement position after an axial release movement.

Abstract: A turning device for compressed air tools. which is operated by a compressed fluid, is provided with a housing and with a rotor, which is rotatably arranged in a front housing part and into whose turbine element the fluid, which is under pressure, can flow, has a braking arrangement and a switch for the compressed fluid. The switch which is operatively connected with the braking arrangement and is arranged on a rear housing part in line with a compressed fluid supply conduit. Such a turning device requires fewer components and can be stopped in a simpler and faster way by a fluid switch, in the form of a sliding switch, which encloses the rear housing part in the area of the supply conduit and is provided with axially oriented control pins, which are connected, fixed against relative displacement, with a brake disk of the braking arrangement.

Abstract: The invention is based on a hand power tool having a tool mount capable of being driving in an at least rotating fashion via a drive motor and a drilling spindle (13), which said tool mount comprises a clamping device for securing tools that is capable of being operated in the direction of rotation of the drilling spindle (13), and having an arresting mechanism (38), via which the drilling spindle (13) can be coupled in torsion-resistant fashion relative to a part (27) of the machine housing (26) to tighten and loosen the clamping device of the tool mount (12), and which opens automatically when torque is transferred from the drive motor to the tool mount (12) and locks automatically when torque is transferred from the tool mount (12) to the drive motor. The arresting mechanism (38) is located on an intermediate shaft (17) and combined with a safety clutch (58) that is also located on the intermediate shaft (17) (FIG. 2).

Abstract: A pneumatic tool apparatus, a pneumatic tool, and a method of making and using a pneumatic tool apparatus is disclosed. The apparatus has an inner torsion bar and an outer tube which has recesses which allow the apparatus to provide more torque in one direction of rotation than in the other direction of rotation.

Abstract: A pneumatic ratchet drive wrench of the present invention includes a pair of single springs that each bias a corresponding pawl into engagement with an output member and inhibit counter-rotation of the output member opposite the corresponding pawl. The pawl and spring construction allows the wrench head to be smaller than conventional pneumatic ratchet drive wrenches, providing better wrench access into small spaces. The spring is inexpensively formed as one piece of spring wire having independent spring coils for biasing the pawl and inhibiting counter-rotation of the output member.

Abstract: The present invention relates to a powered screw driver having a spindle 20 that is caused to rotate by an electric motor 10 within a range of about 5000 rpm (revolutions per minute) to about 7000 rpm (revolution per minute) when the spindle 20 idles. Because the spindle 20 rotates at a high revolution speed, the screw-fastening operation can more quickly be completed when the user of the screw driver 1 fastens the screw in a normal posture. The screw driver 1 may used to fasten screws having a pitch within a range of about 1.3 mm to 2.0 mm (i.e. about {fraction (1/32)} inch to {fraction (3/32)} inch).

Abstract: A clutch mechanism (17) includes an internal gear (10) and a plurality of cylindrical pins (26) pressed rearward against a front end surface of the internal gear (10) by a coil spring (25) via a flat washer (24). Provided on the internal gear's front end surface are a plurality of cam protrusions (28) corresponding in number and position with the pins (26). Each cylindrical pin (26) has at its rear end surface a circumferentially chamfered edge (27) and each cam protrusion (28) has a pair of guide slope surfaces (29) with same inclination as the chamfered edge (27) of the pin (26).

Abstract: An adjustment mechanism for a clutch. The adjustment mechanism includes an annular adjustment structure having an adjustment profile with a ramp section, a first adjustment segment, a last adjustment segment and a plurality of intermediate adjustment segments. The first adjustment segment is configured to correspond to a first clutch setting and the last adjustment segment is configured to correspond to a last clutch setting. The ramp section is positioned between the first and last adjustment segments such that the adjustment structure is rotatable between the first and last adjustment segments and between the last and first adjustment segments without engaging any of the intermediate adjustment segments.

Abstract: A powered, unidirectional output controlling apparatus mounted between the main shaft of an electrically powered tool and a power source is provided. The apparatus comprises a rotating seat, a plurality of flexible disc seats made from a rubber material, a locking seat, a plurality of locking rollers and a fixing ring. One end of the rotating seat is engaged with the power source output of a power transmission mechanism and the other end of the rotating seat is provided with a plurality of insertion shafts passing though the locking seat fastened by two flexible disc seats. The locking seat is first mounted into the fixing ring. The center of the rotating seat is provided with a bolt hole for the mounting of the main shaft. The external edge of the fixing ring is secured to the housing of the electrically powered tool. An inner side of the fixing ring is formed with an annular groove into which a rubber ring is disposed.

Abstract: An impact rotary tool includes an output shaft having an anvil at an end portion thereof, a hammer having a projecting portion applying an impact force to the anvil under a predetermined condition, a driving shaft connected to the hammer through a cam mechanism, and a changeover mechanism for changing the connection between the driving shaft and the output shaft. The mechanism is arranged along with a common axis defined by the driving shaft and the output shaft. The changeover mechanism includes a connecting member accommodated into the driving shaft in a first condition, and connecting the driving shaft and the output shaft in a second condition.

Abstract: A structure for enhancing torque output of an electric drill includes a torque output unit mounted in an inner housing of a torque control unit. The torque output unit includes an intermediate washer located between an internal gear and a locating gear ring to isolate other components behind it from any backward transmitted reaction force that is generated when the electric drill operates, making it possible to use economical plastic instead of expensive powder metallurgic locating gear ring and pinions, and to snap-fit instead of screwing a motor bedplate to a rear end of the inner housing. The locating gear ring is provided with stop lugs to engage with open recesses provided on the inner housing and the internal gear, preventing slippage of the torque output unit in the inner housing even at a large torque output.

Abstract: A multi-speed transmission assembly for a rotary power tool. The transmission assembly includes a plurality of transmission stages, with at least two of the transmission stages employing a movable reduction element that permits the transmission stage to be operated in an active mode and an inactive mode. The movable reduction elements are coupled to a switching mechanism that switches the reduction elements in a predetermined manner to provide at least three-gear reduction or speed ratios.

Abstract: An adjustment mechanism for a clutch. The adjustment mechanism includes an annular adjustment structure having an adjustment profile with a ramp section, a first adjustment segment, a last adjustment segment and a plurality of intermediate adjustment segments. The first adjustment segment is configured to correspond to a first clutch setting and the last adjustment segment is configured to correspond to a last clutch setting. The ramp section is positioned between the first and last adjustment segments such that the adjustment structure is rotatable between the first and last adjustment segments and between the last and first adjustment segments without engaging any of the intermediate adjustment segments.

Abstract: A hand held power tool formed as impact drilling power tools has a housing, a drive which is drivingly supported in the housing, a mechanical striking mechanism for a striking operation of a tool in a tool receptacle and having one striker, a drive element through which the striker is drivable in its striking movement, the drive element having at least one curved track with raised portions and depressed portions extending in an axial direction of the tool, a sensing element which is in operative connection with the striker and has at least one sensing member which is bringable in operative connection with the raised portions and depressed portions of the curved track, the striker being supported on the drive.

Abstract: A multipurpose combination tool comprises a main body portion with a motor and drive shaft, and an interchangeable tool head portion that can be removably coupled to the main body portion through a locking mechanism and power transmission device for transmitting power from the main body portion to the tool head portion. The locking mechanism includes a thrust ring, a locking ring and a locking pad operably associated with the main body portion and a locking head operably associated with the tool head portion. The power transmission device comprises an internal spline on the main body portion that meshes with an external spline on the tool head portion. In this manner, the tool head portion associated with one task, such as drilling, can be changed for other tool head functions associated with other tasks, such as sanding, grinding, mixing, sawing, and so on to thereby provide multiple tasking with one machine.

Abstract: A charging type multipurpose combination tool comprises a main body portion releasably connectable to a plurality of interchangeable tool head portions through a locking mechanism. The main body portion includes an electric motor, a speed control switch and a battery set, while the interchangeably tool head portion may be arranged to form an electric drill, a sanding machine, an angular grinding machine, a cement mixer, a sawing machine, an engraving machine, and the like. The locking mechanism includes an external spline fixed on the electric motor output shaft for rotation therewith and an internal spline located on the locking head that meshes with the external spline for transmitting power to the tool head portion. A locking piece on the main body portion has wedged-shaped faces that releasably engage a locking head on the tool head portion.

Abstract: An air cylinder is connected to a centrifugal mesh clutch mechanism connected to an air motor. A driver bit is mounted to a front face of a piston of the air cylinder. A hexagonal shaft is mounted to a rear face thereof and the hexagonal shaft is fitted to a hexagonal hole formed at an anvil of the centrifugal mesh clutch mechanism. A hole having a diameter larger than that of the hexagonal shaft is formed at center of a rotor of the air motor to thereby enable to freely lift the piston and the driver bit in the air cylinder. By simultaneously driving the air motor and the air cylinder by pressurized air, the hexagonal shaft, the piston and the driver bit advance while rotating integrally to thereby fasten a screw.

Abstract: A locking device is provided between a gear train and an output shaft of a power hand tool. Pawls are arranged in a central bore of a fixed ring with an outer face thereof opposing an inner circumference of the central bore with a tiny gap therebetween. A coupler drivingly engages the shaft and the retention rings whereby when the coupler is rotated by the gear train, the coupler drives the disk and the pawls simultaneously and thus allowing the shaft to be rotated without constraint. When a user manually rotates the output shaft, the disk is rotated while the pawls are prevented from rotation about the first axis which causes a rotation of each pawl about the second axis leading to an interference between the outer face thereof and the inner circumference of the fixed ring thereby preventing the shaft from being further rotated.

Abstract: A hand-held tool with more than two modes of operation and including a clutch pusher (4) at least partially located in the tool housing and fixedly connected with a bevel gear engaging a bevel gear (9) supported on the drive spindle (3), and at least one engagement cam (6) which connects the clutch pusher (4) with driving gears (11) with a possibility of axial displacement of the clutch pusher relative thereto in the first and second modes of operation, with the spindle, in the third mode of operation, being stopped without a possibility of rotation relative to the tool housing, and with the engagement cam (6) engaging in a recess (7) provided in the housing.

Abstract: An electric hand tool apparatus (1) for driving a drill-like tool, which carries out an at least partial rotational movement, has within a housing (2), an electric motor (4) without or free of collector and slip ring, the rpm of which can be controlled by motor control electronics (3), wherein an rpm-dependent clutch (5) for transferring the torque is disposed in a force transfer path from the electric motor (4) to a transmission (6). Optionally, to prevent an excessively high twisting of the housing (2), a sensor (7) is evaluated and the rpm of the electric motor (4) is reduced in order to sever the transfer of force by the rpm-dependent clutch (5).

Abstract: A drill 30 for driving a bit 44 into a workpiece 50 includes an assembled anvil 58 and spindle 38, which are mounted for rotation together and for axial movement together within a drill housing 32. A planet carrier 56 is driven by a motor 52 and, in turn rotatingly drives the anvil 58 and the spindle 38. A chuck 42 is attached to a forward end of the spindle 58 for rotation and axial movement therewith. A plurality of rollers 162 are mounted in nests 182 of a roller cage 176, are maintained in parallel with an axis of the drill 30, and the anvil 58. The rollers 162, which are included in an automatic spindle lock 33, can be wedged between a fixed surface 74 of the drill housing 32 and a movable surface 102 of the anvil for automatically locking the spindle 38 with the housing. Following withdrawal of the bit 44 from the workpiece 50, an automatic brake 35 provides facility for braking the spindle 38.

Abstract: A clutch mechanism (17) includes an internal gear (10) and a plurality of cylindrical pins (26) pressed rearward against a front end surface of the internal gear (10) by a coil spring (25) via a flat washer (24). Provided on the internal gear's front end surface are a plurality of cam protrusions (28) corresponding in number and position with the pins (26). Each cylindrical pin (26) has at its rear end surface a circumferentially chamfered edge (27) and each cam protrusion (28) has a pair of guide slope surfaces (29) with same inclination as the chamfered edge (27) of the pin (26).

Abstract: A hand-guided drilling machine or percussion drilling machine has a machine housing, a drilling spindle, a drive motor for rotatably driving the drilling spindle, a tool holderformed as a drilling chuck and screwed with the drilling spindle through a thread, the drilling spindle during exchanging a tool or exchanging the tool holder receiving a releasing or tightening moment, an arresting device non-rotatably coupling the drilling spindle relative to the machine housing, an intermediate shaft non-rotatably connected with the drilling spindle, a component connected with the machine housing, the arresting device being arranged between one element selected from the group consisting of the drilling spindle and the intermediate shaft and another element selected from the group consisting of the machine housing and the component, the arresting device automatically opening during a torque transmission from the drive motor to the tool and automatically closing during the torque transmission from the tool holder in an

Abstract: A lock washer (24) presses balls (21) and pins (23) against a clutch cam (18) with protrusions (19) formed on its front face. A rear end (25a) of a spring holder (25) abuts on the inner edge of the front face of the lock washer (24) while the half of the front end surface of each pin (23) abuts on the rear face of the outer edge of the lock washer (24). Furthermore, the compression spring (26) also abuts on the lock washer (24) with its outer edge approximately aligned with the outer edge of the lock washer (24). Therefore, if a large load is instantaneously applied to a spindle (11) at the end of screw tightening, the outer edge of the lock washer (24) deforms forward. This in turn causes the balls (21) to ride over the protrusions (19) of the clutch face, thus allowing a slight rotation of the internal gear (10c). This clutch operation lessens the impact that occurs at the end of screw tightening, serving to protect the tool mechanism and to reduce the shock to the operator's hand.

Abstract: A power tool has an application mechanism (300) for connection to the output of an epicyclic gearbox provided with a torque control ring. The mechanism has a body (310) journalling a chuck spindle (302). Outside the body is a clutch control arrangement comprising balls (334,336) pressed against the torque control ring by individual springs (330) controlled by a control ring (322) threaded on the body. The mechanism includes a hammer arrangement having rotary and fixed ratchet plates (378,376) and cam ring (308) operable to engage and separate the plates by a lever (360) which projects between the springs (330).