Abstract: A projected portion provided at a cylinder and projected in a radius direction is formed at an end face thereof on a side of a tool holding portion, and a holding portion on one side of holding portions for holding an outer periphery of the cylinder by at least two portions remote from each other in an axial direction to position in the radius direction of the cylinder is configured by a guide face having an inner diameter of a dimension substantially the same as an outer diameter of the projected portion and extended over to a contact face brought into contact with the projected portion from an end face of a cylinder case on a side of the tool holding portion.

Abstract: The invention relates to a pneumatic percussive tool for a paving breaker and/or a hammer drill comprising a drive piston which is displaceable both backwards and forwards by a crankshaft and arranged in a percussion piston which is displaceable both backwards and forwards. A hollow chamber is connected to a compensating chamber by an idling air channel and embodied between the drive piston and the percussion piston in order to receive a pneumatic spring. A valve is arranged in the idling air channel, the opening and closing position thereof depending on the rotational speed of the crankshaft. If the rotational speed of the crankshaft falls below a predetermined value, the valve opens the connection between the hollow chamber and the compensating chamber so that a pneumatic spring can no longer be to embodied in the hollow chamber and the pneumatic percussion tool is placed in a idling position.

Abstract: An electrically powered hammer comprising a hollow cylindrical spindle mounted within a housing. A portion of the spindle is formed with a plurality of circumferentially spaced holes and a corresponding number of peg elements are fitted to the spindle, such that each peg element extends through a corresponding hole in the spindle and radially inwardly of the internal surface of the spindle, in such a way that the peg elements together form an axial stop for one or more additional hammer components located within the spindle. Each peg element may alternatively or additonally extend radially outwardly of the corresponding hole in the spindle, in such a way that the peg elements together form an axial stop for one or more additional hammer components located around the spindle. The axial stops formed by the peg elements can replace circlips, which are generally used to form the axial stops.

Abstract: A percussion hammer drill and/or percussion hammer that can be guided by a handgrip comprises a pneumatic spring striking mechanism with a reciprocating drive piston and with a percussion piston that can be operated by the drive piston. A cavity for accommodating a pneumatic spring is provided between the drive piston and the percussion piston. The cavity can be connected to the surrounding area via a no-load operation channel in order to achieve a no-load operation. This this end, a valve is situated inside the no-load operation channel and can be controlled according to an application force that can be applied to the handgrip by the operator.

Abstract: In a percussion tool such as an electric hammer or a hammer drill in which the axial direction of a motor 8 is substantially perpendicular to that of a tool bit 1 attached to a tool holder 2, a motor housing 3 is made of a hard material such as aluminum, and a tail cover 4 is disposed on the lower end of the motor housing 3, projections 3a and 3b which project beyond the tail cover 4 are disposed.

Abstract: It is, accordingly, an object of the present invention to provide an electric hammer with improved construction, while ensuring the vibration reduction performance. According to the present invention, a representative electric hammer may include a hammer bit, a driving motor, a crank mechanism and a counter weight. The crank mechanism drives a striker by converting a rotating output of the driving motor to linear motion in the axial direction of the hammer bit. The counter weight is detachably mounted to the crank mechanism and serves to reduce vibration of the striker. According to the representative hammer, because the counter weight is detachably mounted to the crank mechanism, it is possible to switch between the mode in which the counter weight is mounted on the hammer body in order to reduce and alleviate vibration and the mode in which the counter weight is removed from the hammer so that the operation can be performed with the hammer having a lighter weight and slimmer appearance.

Abstract: An electrical hand held tool for producing at least a percussion movement of a working tool includes an electrical drive, a first, oscillating subassembly including a percussion mechanism (2) and a rotor (5) of the electrical drive for transmitting torque to the percussion mechanism and rotatable about a rotor axis (B) extending parallel to an oscillation path (I) of the first subassembly, and a second subassembly including a housing (6) in which the first subassembly is supported for a limited oscillating movement along a tool axis (A).

Abstract: The invention relates to a handheld hammer drill and/or paving breaker which is at least of average weight and power class and which comprises an electric motor, a striking tool which can be actuated by the electric motor and a housing wherein the electric motor and the striking tool are received. A handle is embodied in such a way on the housing that a holding position is arranged in a projection of the striking axis of the striking tool. A rotating axis of a motor shaft of an electric motor is parallel to the axis of the striking axis, the total length of the hammer drill and/or striking hammer being small in the longitudinal direction.

Abstract: An electrically powered hammer comprising a hammer housing (10,15) with a hollow cylindrical spindle (4) mounted within it and an air cushion hammering mechanism mounted within the spindle for generating repeated impacts on a tool or bit of the hammer which hammering mechanism includes a piston (24). A rotatingly driven intermediate shaft (6) is rotatably mounted in the housing and a wobble drive arrangement (12, 16, 18, 20) reciprocatingly drives the piston (24). The wobble drive arrangement includes a wobble sleeve (12) rotatably mounted on the intermediate shaft (6) and a wobble bearing (14, 16, 18) on the wobble sleeve. A support bearing (46, 42) for the intermediate shaft is mounted on the wobble sleeve forwardly of the wobble bearing assembly. The support bearing (46, 42) comprises a bearing ring (46) and the bearing ring is formed with a peripheral flange which can be fixed to a housing part (10) of the hammer housing (10,15).

Abstract: The invention is based on a hand power tool, in particular a drilling- and/or chipping hammer, having a machine housing (12), a tool guiding element (16; 54), a hammer tube (14; 52), and a safety catch (32)—fixed in the housing in stationary fashion in the axial direction—for a striker (24) that can be driven by means of a drive piston (22) and that is actively joined with a tool (20) situated in a tool guiding element (16; 54). It is proposed that the tool guiding element (16; 54) is designed to be axially displaceable in relation to the machine housing (12).

Abstract: A pneumatic percussive tool for a paving breaker and/or a hammer drill, provided with a drive piston which is axially displaceable both backwards and forwards, comprising a guide sleeve and a piston bottom supporting the guide sleeve. A percussion piston can be displaced axially in the guide sleeve of the drive piston with the piston head thereof in percussive mode. During the transition from percussive to idling mode, the piston head slides out of the guide sleeve in such a way that the percussion piston is substantially maintained in the idling mode in an axially displaceable manner by means a stationary part of the percussion tool housing as opposed to being so maintained in the guide sleeve. The axial length of the drive piston can be reduced, whereby the mass of the drive piston and vibrations caused by the movement of the drive piston in the percussive and idling mode can also be reduced.

Abstract: It is, accordingly, an object of the present invention to provide an electric hammer with improved construction, while ensuring the vibration reduction performance. According to the present invention, a representative electric hammer may include a hammer bit, a driving motor, a crank mechanism and a counter weight. The crank mechanism drives a striker by converting a rotating output of the driving motor to linear motion in the axial direction of the hammer bit. The counter weight is detachably mounted to the crank mechanism and serves to reduce vibration of the striker. According to the representative hammer, because the counter weight is detachably mounted to the crank mechanism, it is possible to switch between the mode in which the counter weight is mounted on the hammer body in order to reduce and alleviate vibration and the mode in which the counter weight is removed from the hammer so that the operation can be performed with the hammer having a lighter weight and slimmer appearance.

Abstract: It is an object of the present invention to provide a reciprocating power tool having a further improved power transmission mechanism for converting a rotating output of a driving motor into linear motion in the axial direction of the tool bit. According to the present invention, a representative reciprocating power tool may comprise a tool bit, a driving motor, a power transmission mechanism. The power transmission mechanism converts a rotating output of the driving motor into linear motion in the axial direction of the tool bit. The power transmission mechanism includes an internal gear, a planetary gear and a power transmission pin. The internal gear is allowed to rotate by a predetermined degree in relation to a load applied to the tool bit. As the result of rotation of the internal gear, the relative position of the power transmission pin is changed with respect to the point of engagement between the internal gear and the planetary gear.

Abstract: An electrically powered hammer comprising a hollow spindle within which spindle is reciprocatingly mounted a piston, a ram, a beatpiece having an increased external diameter mid-portion and located within the spindle between the ram and the tool or bit, a two part sleeve arrangement located within the spindle and including an increased internal diameter mid-portion for receiving the increased external diameter portion of the beatpiece and a reduced internal diameter forward and rearward portion for guiding the forward and rearward ends respectively of the beatpiece and where the sleeve arrangement includes a forward sleeve and a rearward sleeve which are both guided with tight radial tolerances and with a slight axial play within and by the spindle and the forward axial movement of the forward sleeve is limited by a reduced diameter portion of the spindle and the forward axial movement of the rearward sleeve is limited by the forward sleeve.

Abstract: A pneumatic percussive mechanism having an axially reciprocating percussive loaded percussion piston (2), wherein a non-contacting magnetic field sensitive sensor (3) is arranged radial thereto. The percussion piston (2) features at least externally ferromagnetic material and has a plurality of axially separated zones (4) of different magnetic permeability.

Abstract: A percussion hammer drill and/or percussion hammer that can be guided by a handgrip comprises a pneumatic spring striking mechanism with a reciprocating drive piston and with a percussion piston that can be operated by the drive piston. A cavity for accommodating a pneumatic spring is provided between the drive piston and the percussion piston. The cavity can be connected to the surrounding area via a no-load operation channel in order to achieve a no-load operation.

Abstract: A hand held electrically powered hammer comprises a housing, a motor, and a hollow spindle. A piston and a ram are located for reciprocation within the spindle. A casing encloses at least part of the spindle so as to define a chamber between the spindle and the casing. A damping mass is slideably supported by a spacer and is located within the chamber and is connected to the hammer housing via a spring so as to oscillate back and forth along the spindle to minimize the vibration of the hammer housing and also so as to generate air flows within the chamber for facilitating heat transfer from the spindle to the metal casing.

Abstract: An electrically powered hammer is provided comprising a housing, a spindle, a hammering mechanism including a piston reciprocatingly mounted within the spindle, a wobble drive arrangement reciprocatingly connected to the piston, a trunnion arrangement including a cross bolt is driving engaged between the wobble drive arrangement and the piston, and wherein the piston includes a pair of piston arms and a protrusion so that the first piston arm and the protrusion define a first recess and the second piston arm and the protrusion define a second recess, and each of the recesses is shaped so as to support a wear reducing washer in an assembled position. When assembled each washer fits around the cross bolt in a region adjacent the inwardly facing face of the associated piston arm so as to reduce wear between the cross bolt and the piston arms.

Abstract: A hammer drill (1) includes a lock plate (35) forward of a boss sleeve (13) and a swash bearing (14) which cooperates with the boss sleeve to convert the rotation of an intermediate shaft (5) on which the boss sleeve is mounted. The lock plate is mounted on the boss sleeve and selectively engages claws (23) of the boss sleeve (13) in a manner that permits its integral rotation with and axial slide with respect to the boss sleeve. The lock plate is additionally biased in the forward direction by a coil spring (38) so that when a clutch (19) is shifted forward in a drill mode, the lock plate also moves forward into engagement with a stopper (39) secured to an inner housing (4), preventing inadvertent rotation of the boss sleeve.

Abstract: The invention relates to a handheld hammer drill and/or paving breaker which is at least of average weight and power class and which comprises an electric motor (23; 30), a striking tool (9) which can be actuated by the electric motor (23; 30) and a housing (2) wherein the electric motor and the striking tool are received. A handle (8) is embodied in such a way on the housing (2) that a holding position is arranged in a projection of the striking axis (6) of the striking tool (9). A rotating axis (25) of a motor shaft (26) of an electric motor is parallel to the axis of the striking axis (6), the total length (LGES) of the hammer drill and/or striking hammer (1) being small in the longitudinal direction.

Abstract: A motor driven hammer comprising a tool holder and an air cushion hammering mechanism including a piston and a beat piece slideably located in a cylinder wherein reciprocation of the piston in the cylinder will cause the beat piece to hit a tool located in the tool holder, and further comprising an eccentric mass mounted for rotation about the axis of the cylinder and rotatingly driven by the motor via a gear arrangement so as to cause the bit mounted in the tool holder to be laterally diverted.

Abstract: An electrically powered hammer comprising a hollow spindle within which spindle is reciprocatingly mounted a piston, a ram, a beatpiece having an increased external diameter mid-portion and located within the spindle between the ram and the tool or bit, a two part sleeve arrangement located within the spindle and including an increased internal diameter mid-portion for receiving the increased external diameter portion of the beatpiece and a reduced internal diameter forward and rearward portion for guiding the forward and rearward ends respectively of the beatpiece and where the sleeve arrangement includes a forward sleeve and a rearward sleeve which are both guided with tight radial tolerances and with a slight axial play within and by the spindle and the forward axial movement of the forward sleeve is limited by a reduced diameter portion of the spindle and the forward axial movement of the rearward sleeve is limited by the forward sleeve.

Abstract: A combined electrical hand tool having an operating mode selection switch (1) with additional special functions that can be switched using a displaceable linkage (5) that can be displaced by the operating mode selection switch arranged between a lubricated assembly (2a) having a coupling (3a) and the external housing (4), wherein in at least two separate lubricant-tight assemblies (2a, 2b) at least one switchable coupling (3a, 3b) is present, which can be moved over an outwardly extending actuator (6a, 6b) that is mounted lubricant-tight.

Abstract: A hammer drill is equipped with a connector shaft, which is rotationally driven by a motor, a spindle that transmits the rotation through a connector shaft, and a percussive impact means that applies a percussive force in the axial direction to a drill bit held by the spindle through performing a reciprocating motion, in the axial direction, relative to a spindle that receives the rotation of the connector shaft through a motion converter mechanism. The hammer drill is provided with a percussive force converter means from the percussive impact means by changing the speed reduction ratio between the motor and the connector shaft. This makes it possible to adjust the percussive force according to the drill bit used.

Abstract: A pneumatic percussive tool for a paving breaker and/or a hammer drill, provided with a drive piston which is axially displaceable both backwards and forwards, comprising a guide sleeve and a piston bottom supporting the guide sleeve. A percussion piston can be displaced axially in the guide sleeve of the drive piston with the piston head thereof in percussive mode. During the transition from percussive to idling mode, the piston head slides out of the guide sleeve in such a way that the percussion piston is substantially maintained in the idling mode in an axially displaceable manner by means of a stationary part of the percussion tool housing as opposed to being so maintained in the guide sleeve. The axial length of the drive piston can be reduced, whereby the mass of the drive piston and vibrations caused by the movement of the drive piston in the percussive and idling mode can also be reduced.

Abstract: The invention relates to a pneumatic percussive tool for a paving breaker and/or a hammer drill comprising a drive piston which is displaceable both backwards and forwards by a crankshaft and arranged in a percussion piston which is displaceable both backwards and forwards. A hollow chamber is connected to a compensating chamber by an idling air channel and embodied between the drive piston and the percussion piston in order to receive a pneumatic spring. A valve is arranged in the idling air channel, the opening and closing position thereof depending on the rotational speed of the crankshaft. If the rotational speed of the crankshaft falls below a predetermined value, the valve opens the connection between the hollow chamber and the compensating chamber so that a pneumatic spring can no longer be embodied in the hollow chamber and the pneumatic percussion tool is placed in an idling position.

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: The striking mechanism has a hammer barrel (3), which has at least one control opening (23) through which, in an idle position, the air can escape from the hammer barrel (3), and which in a striking position is closed by a covering (25) that prevents the escape of air. To achieve the greatest possible sealing off of the at least one control opening (23) and thus high efficiency of the striking mechanism, the covering (25) is molded from an elastomer.

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 drill hammer or riveter, includes a housing (11), in which a hammering mechanism (12) is accommodated that in an axially displaceably supported guide tube (13) has a reciprocating piston (16) and a striker (17), drivable by the piston (16) via an air cushion; the hammering mechanism (12) can be moved out of an idling position into a hammering position by an axial displacement of the guide tube (13); the guide tube (13) is urged by a restoring spring (27) in the direction of the idling position with a restoring force: and between the guide tube (13) and the housing (11), at least one damping and/or spring member (30, 36, 37) is provided, which in the hammering position of the guide tuber (13) has a spring or damping characteristic between the guide tube (13) and the housing (11) that deviates from the restoring spring (27) in the region of the idling position.

Abstract: A percussion mechanism of a hand-held power tool includes a reciprocating percussion piston (1) displaceable under the action of a pneumatic spring (5) to apply blows to an end surface of a working tool (8), which is received in a chuck (7) of the power tool, directly or via an anvil (6), with the percussion piston (1) and/or the anvil (6), when the anvil is used, being formed of a non-ferromagnetic material.

Abstract: An electrically powered hammer comprising a hollow cylindrical spindle mounted within a housing. A portion of the spindle is formed with a plurality of circumferentially spaced holes and a corresponding number of peg elements are fitted to the spindle, such that each peg element extends through a corresponding hole in the spindle and radially inwardly of the internal surface of the spindle, in such a way that the peg elements together form an axial stop for one or more additional hammer components located within the spindle. Each peg element may alternatively or additonally extend radially outwardly of the corresponding hole in the spindle, in such a way that the peg elements together form an axial stop for one or more additional hammer components located around the spindle. The axial stops formed by the peg elements can replace circlips, which are generally used to form the axial stops.

Abstract: A combined electrical hand tool having an operating mode selection switch (1) with additional special functions that can be switched using a displaceable linkage (5) that can be displaced by the operating mode selection switch arranged between a lubricated assembly (2a) having a coupling (3a) and the external housing (4), wherein in at least two separate lubricant-tight assemblies (2a, 2b) at least one switchable coupling (3a, 3b) is present, which can be moved over an outwardly extending actuating means (6a, 6b) that is mounted lubricant-tight.

Abstract: A pneumatic percussion operated mechanism for an at least partially percussion driven hand tool device (1) has a cup-shaped piston (2), in whose hollow space (4) an anvil (3) spaced radially inwardly displaceably penetrates inwardly within an axial penetration length (L), whereby the anvil (3) forms, together with the cup-shaped piston (2), a damping radial gap (X) relative to the essentially gas-tight, closed hollow space (4), which forces anvil (3) axially driven by the piston (2) inside the penetration length (L) to reversal of direction.

Abstract: An engaging portion, formed at an axial end of an intermediate member, is engageable with a slide sleeve. A cylinder has an elongated hole with an axial length longer than a shifting distance of the intermediate member. The slide sleeve includes an annular member and a slide member. The annular member has an inner cylindrical wall engageable with the engaging portion of the intermediate member and a projection extending in a radially outward direction passing through the elongated hole beyond an outer surface of the cylinder. The slide member is coupled around the outer surface of the cylinder and is slidable in the axial direction of the cylinder. One axial end of the slide member, positioned closer to a working tool, is engaged with the projection of the annular member. The other axial end of the slide member is urged toward the working tool by an urging member.

Abstract: The invention is based on a hand power tool, in particular a drilling- and/or chipping hammer, having a machine housing (12), a tool guiding element (16; 54), a hammer tube (14; 52), and a safety catch (32)—fixed in the housing in stationary fashion in the axial direction—for a striker (24) that can be driven by means of a drive piston (22) and that is actively joined with a tool (20) situated in a tool guiding element (16; 54).

Abstract: The invention is based on a hand power tool, in particular a drill- and/or chipping hammer, comprising a striking mechanism (10) that has a drivable pot-type piston (12) with at least one idle opening (14).

Abstract: An electrical hand operated tool driving device (1), such as a hammer drill, a combination hammer or a chipping hammer, has an electropneumatic striking mechanism (2), for which a cooling medium (8), for cooling the striking mechanism (2), flows through a liquid-tight cooling medium duct (10, 11, 12, 13), which is disposed in a housing (7) of the tool driving device (1).

Abstract: The invention relates to a pneumatic percussive mechanism for a percussion drill and/or a drill hammer. The inventive mechanism comprises, housed in the housing of the percussive mechanism, an axially reciprocating percussion piston. A drive piston is axially reciprocated in a guide cylinder of said percussion piston. The guide cylinder is provided on its inner face with one or more air compensation pockets. At least one idle opening extends through the guide cylinder. In the percussive action, the idle opening does not communicate with the ambience while in the idle mode the idle opening can be displaced via an idle channel that leads to the ambience and thus connects a cavity that receives a pneumatic piston with the ambience by way of the idle opening. The air compensation pockets and the idle openings allow and optimization of the piston return behavior and of the idle operation of the percussive mechanism.

Abstract: A first switching member, having a claw portion engageable with a claw portion of a first gear, is slidably mounted on a crank shaft without causing any relative rotation therebetween. A first urging member resiliently urges the first switching member so that the claw portion of the first switching member is engaged with the claw portion of the first gear. A second switching member, having a claw portion engageable with a claw portion of a second gear, is slidably mounted on an intermediate shaft without causing any relative rotation therebetween. A second urging member resiliently urges the second switching member so that the claw portion of the second switching member is engaged with the claw portion of the second gear.

Abstract: A pneumatic percussion power tool has a percussion tool housing in which a drive piston and a percussion piston are movable in an axial direction. The motion of the drive piston, which is generated by a crank mechanism, is transmitted to the percussion piston through a pneumatic spring in a first chamber so that the percussion piston cyclically strikes a ram or a tool. The backward motion of the percussion piston rebounding from the ram is supported by increasing air pressure in a third chamber that is supplied with air by the drive piston through a second chamber and a communicating channel.

Abstract: A percussion electrical hand-held tool including a housing (10), a percussion element (2) located in the housing, and a planetary gear unit (5) located in the housing (10) for converting a rotational movement (107) of the drive shaft (&ohgr;) of the hand-held tool (8) into a reciprocating movement (&ugr;) of the percussion element (2), with the planetary gear unit (5) including a sun gear (6) changing of a setting (&agr;) of which provides for adjusting of an impact amplitude of the reciprocating movement (&agr;) of the percussion element (2), and control unit located in the housing (10) for adjusting the impact amplitude in accordance with a manual axial force applied to the handle of the hand-held tool (8).

Abstract: A fastening device for driving a fastener into a workpiece by effecting multiple blows upon the fastener comprises a housing and a striker assembly movably mounted within the housing. The striker assembly includes a driver assembly adapted to strike the fastener to be driven into the workpiece. A nose assembly is movably mounted on the housing and has a fastener drive track along which the driver assembly and the fastener travel when the fastener is driven into the workpiece. The fastening device has a feed mechanism operatively connected to the nose assembly for mechanically advancing the fastener into the fastener drive track. The fastener drive track has a guide surface adjacent the aperture of the nose assembly to direct the fastener as it is driven into the workpiece. A releasable fastener assembly releasably secures the nose assembly to the housing of the fastening device. A control assembly controls the operation of the fastening device to conserve energy.

Abstract: A hand held electrically powered hammer, comprising a housing, a motor, a hollow spindle within which is located for reciprocation therein a piston and a ram, and a casing which encloses at least part of the spindle so as to define a chamber between the spindle and the casing and wherein a damping mass is located within the chamber and is connected to the hammer housing via at least one spring element so as to oscillate back and forth along the spindle to minimise the vibration of the hammer housing, and also so as to generate air flows within the chamber for facilitating heat transfer from the spindle to the casing.

Abstract: A multi-stroke fastening device comprising a housing, a fastener drive track carried by the housing, a striker assembly guide track mounted within the housing, a striker assembly mounted in slidable relation within said guide track, a power drive assembly, and a feed mechanism. The striker assembly includes a driver member constructed and arranged to strike a fastener disposed in the fastener drive track. The striker assembly is constructed and arranged to be moved along the guide track through a plurality of alternating drive strokes and return strokes to effect a plurality of impacts of the driver member upon the fastener in order to drive the fastener into the workpiece. The striker assembly has a substantially constant drive stroke lengths relative to the guide track.

Abstract: An electrical hand operated tool driving device (1) for producing an at least partially impacting movement of a tool (11) with an air striking mechanism (2) and a no-load stroke disconnection, which scans the no-load stroke position (9) by a sensor (14) and evaluates it with an assigned control unit (15), and in the event of a no-load stroke, lowers the rpm of an energizing driving mechanism (3) over the control unit (15) to a previously fixed reduced rpm.

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: A percussion mechanism for an electrical hand-held power tool including a guide tube, a percussion piston (4) axially displaceable in the guide tube (2), an anvil (5) for impacting a working tool and axially displaceable together with the percussion piston (4), a gas spring (1) provided on an axial side of the percussion piston (4) remote from the anvil (5), an air channel (9) for aeration of the gas spring (1) and extending between an axial region of the gas spring (1) and an axial region of the anvil (5) outwardly of the inner surface of the guide tube (2), and a ventilation opening (8) for communicating the air channel (9) with a surrounding environment and which is closed by the anvil (5) in its operational position.

Abstract: A rotary hammer includes a spindle 18 which can be rotatably driven by an intermediate shaft 24 by way of a drive means. A tool holder 16 is arranged for rotation with the spindle 18, and for releasably holding a bit or tool for selective rotation and/or reciprocation. A pneumatic hammering arrangement facilitates repeated impacting of the bit or tool for reciprocation within the tool holder (16). A mode change mechanism includes a knob 18 for selectively operating the rotary hammer in any of three modes, identified as a rotary drive only mode, a hammer only mode and a rotary hammer mode.