Abstract: There is provided a magnetic impact tool comprising a magnetic hammer driven by a motor, a magnetic anvil disposed so as to face the magnetic hammer, an output shaft that rotates together with the magnetic anvil, a magnetic bypass device for distributing magnetic flux between the magnetic anvil and the magnetic hammer, and a changing device for changing the distribution of magnetic flux with the magnetic bypass device, wherein a rotational impact force is magnetically generated in a non-contact manner for the magnetic anvil in conjunction with the rotation of the magnetic hammer. The torque generated between the magnetic hammer and magnetic anvil can be changed by varying the distribution ratio of the magnetic flux from the magnetic hammer to the magnetic anvil and magnetic bypass device by means of the changing device. A large magnetic impact action can be generated, and screw tightening and loosening work can be carried out even if a low-torque motor is used.

Abstract: A hand held power tool has a housing, a drive, a mechanical striking mechanism with a striker, a drive element for driving the striker in its striking movement and having at least one curved track with raised and depressed portions, and a sensing element in operative connection with the striker supported on the drive and having a sensing member bringable in operative position with the raised and depressed portions of the curved track.

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 hammer is provided which enables the orientation of a tool or bit mounted within a spindle of the hammer to be rotated to the required orientation. The hammer comprises a housing part having an aperture therein in which a spindle that is mounted so that the spindle extends out of the housing through the aperture. The spindle is capable of being rotated about its axis to any of a plurality of orientations, so as to alter the orientation of a tool or bit mounted therein. A locking ring is located around the spindle which locking ring can be moved axially along the spindle into and out of engagement with the housing part, so that when the locking ring engages the housing, it prevents the spindle from rotating with respect to the housing. A grip ring is located around the spindle and can be rotated about the axis of the spindle from a first position in which it prevents disengagement of the locking ring from the housing.

Abstract: Applicant's novel invention relates to a novel hydrogen generator for supplying hydrogen to drive a hydrogen operated engine. The regulator can supply hydrogen to drive an engine for operating the cutter assembly of a lawnmower as well as supply the output of a hydrogen driven engine to operate a variety of power operated devices such as drills, saws, sanders, etc. In addition, the hydrogen generator can supply hydrogen to operate a power driven piston to drive fasteners.

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: The present invention is directed to a machine tool, in particular to a hand-operated hammer drill, having a compartment (10) containing lubricant in which at least one rotationally drivable component (12) is mounted and having a device (14) for compensating the pressure in the compartment (10), the device having a rotationally drivable centrifugal component (16) which shields at least one pressure-compensation channel (18) disposed downstream from it, in terns of fluid mechanics, in the venting direction of the compartment (10). It is proposed that the centrifugal component (16) be mounted in a torsionally fixed manner on the rotationally drivable component (12).

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: A trigger controller for an electric power tool including a motor and a pull-trigger movable along a path having a foremost home position comprises a mechanical switch and a solid-state switch connected in series to the motor, wherein the mechanical switch includes a first moving contact, and the controller includes a second moving contact wherein the first and second moving contacts are movable to operate the mechanical and solid-state switches respectively at different predetermined travelling positions of the pull-trigger from the home position such that the two switches are caused to be initially closed at different times.

Abstract: An impact driver (1) includes a main housing (2) encasing a motor (5); an internal gear case (8) which is secured by screws to the main housing (2) and is provided with an externally threaded portion (12); and a hammer case (13) with an internally threaded portion (14) which is adapted for threadable engagement with the externally threaded portion (12) of the internal gear case (8) so as to couple the hammer case (13) to the internal gear case (8). The impact driver (1) additionally includes a rotation stop mechanism comprised of a rack (24) disposed within a forward extending portion (23) of the main housing (2) for meshing with dimples (27) formed in the outer surface of the hammer case (13). By fixing the rack (24) with a feed screw (26) disposed transversely in the forward extending portion (23), the hammer case (13) is prevented from rotation with respect to the internal gear case (8) after assembly of the impact driver (1).

Abstract: A switch assembly (1) for centrally arranged operating mode selection for an at least partially rotary and percussion combination hand tool device (2) is comprised of a first switch sleeve (11) for the switchable percussion drive (6) and a second switch sleeve (12) for the switchable rotary drive meshing with a tool spindle (4) via a countershaft (3) and a switch accessory (10) connecting both switch sleeves (11, 12) together, whereby the countershaft (3) and a percussion drive shaft (5) of the percussion drive (6) are arranged directly adjacent and parallel in a common axially extending zone (B) and rotationally-freely guide a driving gear pair (7) in direct meshing engagement with each other and which can be engaged by way of the switch sleeves (11, 12).

Abstract: A hydraulic unit includes a case, a liner contained in the case, and a top cap and an opposing bottom cap plugged at the front and rear ends of the case. The unit further includes a spindle disposed in the liner and provided with a large diameter section. The large diameter section has a pair of blades with one having longer first pins and the other having shorter second pins on their front and rear end surfaces. A first oblong cam recess and a second oblong cam recess having a longer longitudinal axis and a shallower depth than the first recess are formed in the opposing inner surfaces of the bottom cap and the top cap. During rotation of the case, the cam recesses guide the first and second pins on the blades while preventing the blades from sliding on second sealing surfaces of the liner, which are associated with ribs on the spindle.

Abstract: A reverse apparatus for an air impact wrench in which pressurized air supplied to an air supply passage provided within a grip is fed via the reverse apparatus to an air motor accommodated within an impact wrench main body, and rotational torque output from the air motor is transmitted to an anvil via an impact mechanism. The reverse apparatus includes a cylindrical bush disposed in a lower portion of the impact wrench main body substantially in parallel with an output shaft of the air motor; a valve member slidably disposed within the bush and having an end projecting from the lower portion of the impact wrench main body, the valve member cooperating with the bush in order to supply pressurized air to one of two air ports of the air motor, when positioned at a first axial position, so as to rotate the anvil clockwise and supply pressurized air to the other air port of the air motor.

Abstract: A rock drill includes a mounting frame to which a hammering apparatus and a rotating apparatus is arranged. The mounting frame is made maneuverable with respect to a feeding beam by means of slide blocks fastened to it, whereby a separate carriage is not needed between the drill and the feeding beam. Owing to the mounting frame, the hammering apparatus and/or the rotating apparatus can be replaceable modules. The invention further relates to a mounting frame which is arranged to transmit the feed and recoil forces directed to the drill to feeding means. The mounting frame comprises a section parallel to the feeding beam, to which slide blocks are fastened, and a transverse axial support thereto, to which the hammering apparatus and the rotating apparatus are mounted.

Abstract: A hydraulic motor, especially for driving of rotating tools, consisting of a chamber (2) provided with an inlet (10) for supplying fluid, and with at least one outlet hole (6), before which, on a holding device, a rolling rotor (7) is seated, the rolling rotor (7) is formed by a body of rotational shape. That the chamber (2) is at least in its internal surface of rotational shape and of a tapering diameter. The chamber (2) is on its side of the maximum diameter open, and on the side of its minimum diameter limited by means of a wall (3), in the middle of which a hole (4) is provided, through which a shaft (5) passes with a clearance, the shaft (5) carrying the rolling rotor (7). The shaft (5) is inside the chamber (2) provided with a recess (8), the diameter of which is larger than the diameter of the hole (4) in the wall (3).

Abstract: The invention is based on a hand power tool, in particular a hammer drill, with a drivable drive mechanism (12) accommodated in a housing (10) and a mechanical hammer unit (14), which is for percussion-driving a tool (16) in a tool holding fixture (18) and has a hammer (20) that can be driven in its hammering motion by a driver unit (22), which has at least one annular curved path (24, 26) with raised areas and recessed areas oriented axially toward the tool and has a feeler unit (28), which is operationally connected to the hammer (20) and which, by at least one feeler element (30), can be brought into operational connection with the raised areas and recessed areas of the curved path (24, 26). The invention proposes that the feeler unit (28) has at least two feeler elements (30) that can be brought into operational connection with the curved path (24, 26).

Abstract: A piercing apparatus compact in size having a decreased number of hoses is suited for use as an iron runner port-opening machine for a blast furnace or the like furnace in an iron mill.

Abstract: A rotary hammer includes a spindle 18 which can be rotatably driven by an intermediate shaft 24 by way of a drive device. 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.

Abstract: A percussive rotational impact hammer assembly for creating high torques. A generally cylindrical piston rotatably mounted on a hammer inside an outer casing oscillates on the hammer and strikes an impact surface on the hammer. The piston and housing have pressurized fluid ports and passageways for conducting pressurized fluid to alternately load an impact-driving chamber and return chamber. The piston is accelerated against the impact surface and the kinetic energy of the piston is transmitted to the hammer transmitting the rotational movement to a member engaged with the hammer, such as a drill bit or other member. The rotational impact hammer assembly can be adapted for use in a downhole hammer, in break out tongs for drill pipe, in wrenches for loosening or tightening nuts and bolts, or in other mechanical devices where high torque is desired.

Abstract: A piercing apparatus compact in size having a decreased number of hoses is suited for use as an iron runner port-opening machine for a blast furnace or the like furnace in an iron mill.

Abstract: Check mechanism for rotary shaft of pneumatic tool, including: a ratchet section having a ratchet wheel coaxially fixedly connected with the rotary shaft and synchronously rotatable with the rotary shaft, multiple ratchets being arranged on a circumference of the ratchet wheel; a click section having a click stem movable between an acting position and a releasing position, when the click stem is positioned in the acting position, one end of the click stem resiliently engaging with the ratchets of the ratchet section to restrict the ratchet wheel to one-way rotate and prevent the rotary shaft from rotating backward, when the click stem is positioned in the releasing position, click stem being disengaged from the ratchets of the ratchet section, whereby the ratchet section is released from the checking of the click stem; and a locating section for locating the click stem in the acting position or releasing position.

Abstract: The invention is based on a hand power tool having an electric motor (12) located in a housing (10), via which an insertable tool (16) situated in a tool mount (14) is capable of being driven in a rotating manner, and having a safety device (18) with which a characteristic value for an occurrence of uncontrolled blockage of the insertable tool (16) can be detected via a sensor unit (20), and the movement of the housing (10) can be decelerated.

Abstract: The present invention relates to a percussion electrical hand-held tool having an electronic control unit (5) for controlling at least one power parameter of the electrical tool, and a substantially flat force sensor for controlling operation of the electronic control unit (5) and arranged sliding displacement-free for sensing a press-on force (F, F1) applied by a user in an operational direction of the electric tool, without being displaced, between at least two, associated with each other, press-surfaces (7a, 7b) extending at least partially transverse to a percussion axis (A) of the electrical tool.

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: A reverse apparatus for an air impact wrench in which pressurized air supplied to an air supply passage provided within a grip is fed via the reverse apparatus to an air motor accommodated within an impact wrench main body, and rotational torque output from the air motor is transmitted to an anvil via an impact mechanism. The reverse apparatus includes a cylindrical bush disposed in a lower portion of the impact wrench main body; a valve member slidably disposed within the bush and having an end projecting from the lower portion of the impact wrench main body; and a cam mechanism disposed within the bush and operatively coupled to the valve member so as to position the valve member to first and second axial positions alternatively whenever the projecting end of the valve member is pushed inward.

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: A hammer is provided which enables the orientation of a tool or bit mounted within a spindle of the hammer to be rotated to the required orientation. The hammer comprises a housing part having an aperture therein in which a spindle that is mounted so that the spindle extends out of the housing through the aperture. The spindle is capable of being rotated about its axis to any of a plurality of orientations, so as to alter the orientation of a tool or bit mounted therein. A locking ring is located around the spindle which locking ring can be moved axially along the spindle into and out of engagement with the housing part, so that when the locking ring engages the housing, it prevents the spindle from rotating with respect to the housing. A grip ring is located around the spindle and can be rotated about the axis of the spindle from a first position in which it prevents disengagement of the locking ring from the housing.

Abstract: Two guide members cooperatively constitute a chuck portion for holding a screw head. Opening and closing of the chuck portion is regulated depending on a mutual position between a machine body and a member into which a screw is driven. Guide pin portions of respective guide members engage with a stopper portion of a push lever until a screw is driven to a predetermined depth. The chuck potion tightly holds the screw head until a screw fastening operation is substantially finished, thereby suppressing the lifting of a machine body.

Abstract: A locking device for output shaft of electric tools includes a plurality of brake pads arranged as a circle in a passage in a casing and the brake pads can be limited by a driving disk to co-rotate with a cam mounted on an output shaft. When the output shaft is rotated manually, the brake pads are pushed by the cam and contact the inside of the passage so as to secure the output shaft to output a torque. The driving disk has a hole wherein two hill portions extend from two opposite sides of the hole. The output shaft extends through the hole. A cover plate is mounted to the driving disk and has an aperture whose two opposite sides are located alignment with the two opposite sides of the hole in the driving disk. The driving disk has pawls on a surface thereof and limit the brake pads not to contact the inside of the passage.

Abstract: A reverse apparatus for an air impact wrench in which pressurized air supplied to an air supply passage provided within a grip is fed via the reverse apparatus to an air motor accommodated within an impact wrench main body, and rotational torque output from the air motor is transmitted to an anvil via an impact mechanism.

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: A drilling tool, the drill head (16) of which can be connected either to a drill (10) or a casing string (28), is also fitted with an automatic direction reversing mechanism (64) which is designed so that the driven part (14) of the drill head (60) executes backward and forward movements of less than 90°, but preferably 20° to 30°. In this way the drill head can also strike the casing string when sinking it.

Abstract: A zero gravity robotic tool includes a robotic arm having a distal end. A motor is mounted on the distal end of the robotic arm and is rotated about a motor axis which passes through the center of gravity of the motor and the tool. A prime mover is connected to the robotic arm and to a pivot mechanism for causing the rotation of the motor and the tool about the motor axis.

Abstract: A retaining device for a power drill has multiple brake shoes movably received in the housing, a cam securely engaged with the output shaft to selectively abut the brake shoes to move and engage with an inner periphery of a through hole and a driving disk provided to drive the output shaft and to limit the movement of the brake shoes in the housing. When the brake shoes are moved to engage with the inner periphery defining the through hole, a locking effect is provided to the driving disk so as to the output shaft.

Abstract: A cam drive hammer mechanism. The drive mechanism includes a drive mechanism housing connectable to the housing of the power tool, a first cam member, a second cam member and a gear assembly for drivingly connecting the first cam member and the second cam member to the drive shaft for counter-rotation. The first cam member and the second cam member each have at least one of cam surface, the cam surfaces being oriented at a steep angle with respect to the axis of the tool element, each of the cam surfaces being complementary and engageable with one another. The second cam member includes an impacting surface for engaging the tool element to provide an impact. As the cam members counter-rotate, the cam surfaces engage so that the second cam member is axially moved in a direction relative to the first cam member.

Abstract: A power-driven hammer has a tool holder a middle bore portion which is supported inside a housing and urged backward by a compression spring. The rear end of a large bore portion of the tool holder is slidably fitted into a spline ring which is secured to the front end of a middle housing. Spline grooves are formed in the inner periphery of the spline ring at its front end while spline gears are formed on the outer periphery of the large bore portion. When the spline grooves and the spline gears are engaged with each other, the tool holder, being urged backward, is locked with its rotation prohibited. This tool holder can be temporarily unlocked to allow its rotation by sliding a change ring cover forward and the tool holder itself, thereby disengaging the large bore portion from the spline ring.

Abstract: A power tool with a rotation motor, a rotating output shaft (26), and an angle drive (11) connecting the motor to the output shaft (26) and comprising a gear casing (12), a pinion gear (14) connected to the motor, a crown wheel (17) connected to the output shaft (26), and a lubricant dispensing device including a receptacle (28) immovably supported in the gear casing (12) and having a peripheral side wall (30,31) and an end wall (29), wherein the end wall (29) is formed with a through opening (43) for the output shaft (26) and an outlet opening (43) for the lubricant, and an agitator element (44) is freely movable within the receptacle (28) for agitating the lubricant by vibratory movements during operation of the tool, thereby facilitating spreading of the lubricant toward the outlet opening (43).

Abstract: A device for transmitting pulsed axial percussions to a drill (12) and including a housing (2) one end of which is releasably connectable with a housing (3) of a hand-held rotary drill, a rotation transmitting element (7, 9) rotatably supported within the housing (2) and operatively connected with a rotatable spindle (4), which projects from the rotary drill housing (3), for joint rotation therewith, a chuck (11) provided at an end of the device housing (2) opposite to the one end for receiving the drill (12), a reciprocating hammer member (15) movable into an abutting engagement with a trailing end of the drill (12), and a hammer mechanism (17-20; 21-24) arranged within the device housing (2) for imparting pulsed axial percussions to the hammer member (15) and connected with the rotation transmitting element (7, 9) for generating the pulsed axial percussions.

Abstract: A primary shaft locking device of an electromotive tool is disclosed. A plurality of braking blocks are installed with a plurality of axially projected supporting pieces and a plurality of radially projected nose portions. An output shaft is installed within the receiving hole and a cam is installed in one end of the output shaft so that the cam is rotated synchronously with the output shaft. Furthermore, a driving disk attached to a speed changing gear set is installed, the disk surface of which is installed with a plurality of convex blocks having a fan shape. These convex blocks is matched with the fixing seat, and is arranged between the two supporting pieces installed on the braking blocks. Thereby, when the rotary is driven to rotate, at first, the convex block will rotate the supporting pieces in order that the braking block release from braking condition so as to drive the output shaft, the cam and the braking block to rotate at the same time.

Abstract: A screw driving machine in which a screw having a head is screwed into a work, includes: a body; a nose section positioned toward the work with respect to the body, the nose section holding the screw to be driven; a hammering mechanism accommodated in the body, for hammering the screw into the work until the head of the screw held above the work; a screwing mechanism for screwing the screw hammered into the work; a contact arm slidable with respect to the nose section, the contact arm being pulled in toward the body when the contact arm is pushed against the work; and a locking mechanism for prohibiting the contact arm from sliding in its half way when the contact arm is pushed against the work, and for releasing the contact arm from locking after the hammering mechanism hammers the screw into the work.

Abstract: A pneumatically or electrically powered power tool having a rotating working implement carrying output spindle (14), an exhaust or cooling air outlet passage (21), air outlet openings communicating the outlet air to the atmosphere and comprising a first section (22) located on one side of the tool housing (10, 20) and a second section (23) located on an other side of the housing (10, 20), and an air outlet flow directing valve (25) shiftable between a first condition in which it directs the air flow out through the first opening section (22) and a second condition in which it directs the air flow out through the second opening section (23). The air outlet flow directing valve (25) is shiftable by a maneouver mechanism (35, 36) including a rotatable annular handle (35) on the outside of the housing (10, 20) between the first and second conditions in which it alternatively directs the outlet air flow through the first and second outlet opening sections (22, 23).

Abstract: A hammer drill has a mode change-over mechanism including a change link with a horizontally elongated slot, an eccentric pin projecting from a mode selector switch and penetrating the slot. The change link is moved vertically by rotating the mode selector switch, which in turn vertically moves a pair of change keys secured to a holder of the change link, thus either engaging or disengaging the change keys with or from a sleeve provided in a rotation transmission mechanism for transmitting the rotation of a motor to the tool holder. In the engagement position, the rotation of the motor of the hammer drill is transmitted to a tool holder while in the disengagement position, the rotation of the motor is not transmitted. Also, the eccentric pin is engaged with a square recess formed in a lock ring which is fitted around the tool holder and urged backward by a compression spring.

Abstract: An improved rotary tool head includes a modular embodiment having a shaft with a tapered insertion end to ease insertion into a handpiece socket and to cause self-alignment of the shaft with the socket. Another embodiment of the improved rotary tool head includes a collet with nonlinear slots separating the collet tangs. The nonlinear slots cause a wire or shaft inserted into the collet to be centralized in the collet and prevent the wire or shaft from protruding between the tangs.

Abstract: A drilling and/or chiseling tool includes a striking mechanism (28) driven by a swash pin (12) of a swash mechanism (25). The actuation of the swash pin (12) is effected by a single piece intermediate shaft (11) powered by a drive motor (4). The shaft (11) causes a swash ring (13) from which the swash pin (12) projects, to move due to a rolling track (15) arranged at an angle to the drilling direction of the tool. The drilling direction extends generally parallel to the axis of the intermediate shaft (11). This arrangement greatly assists in the ease of assembly and the economical fabrication of the tool.

Abstract: A rock drill which includes a main body with a chamber which is formed in the main body at a first end of the main body, and a rotation module which includes a gear housing, at least the gear housing being mounted in the chamber.

Abstract: A drilling and/or chiseling tool has a gear box housing component (2) supporting the striking mechanism (31) and an intermediate shaft (15) each having an axis with the axes arranged in parallel relation. The striking mechanism (31) and the intermediate shaft (15 are supported by a bearing plate (28) detachable connected to the gear box housing component (2).

Abstract: A device on machine tools for transmitting a rotational and/or percussive movement to a tool (22) has two or three rotational drivers (14) which are arranged so as to be symmetrical with respect to rotation. The rotational drivers (14) are stepped and flank parts (16) extending radially to the center axis (15) alternate with guide portions (17) extending along a cylindrical outer surface. Locking members (20) which engage in depressions (28) at the tool (22) are arranged in the region of the rotational drivers (14) for the axial locking of the tools (10). With the tool holder (10) according to the invention, tool shafts having diameters between 8 and 12 mm can be clamped without converting or modifying the tool shafts. Good true running characteristics can be achieved in spite of the stationary rotational drivers (14).

Abstract: A drilling and/or chipping tool includes a housing (30) containing a guide tube (36) with a striking mechanism (28) located within the guide tube, with the guide tube and striking mechanism being displaceable in the striking direction relative to the housing. Damping elements abut between the guide tube and the housing. Rotary motion is transmitted from a drive motor (31), located in a stationary position within the housing, in a wear-free manner to a crankshaft (34) of the striking mechanism (28) by an axial displaceable compensation element (33), so that the striking mechanism is displaceable in the striking direction relative to the drive shaft (32) of the drive motor (31).

Abstract: A hammer drill may be set for operation in a hammer mode or a drill mode through a mode selector 41. In the drill mode, output shaft 25 is locked in a forwardly biased position and is rotatably driven through spur gears 29, 31. In the hammer drill mode, output spindle 25 is rotatably driven by spur gears 29, 31 and is axially reciprocated by hammer clutch 55. An output clutch plate 57 of clutch 55 is axially and rotatably fixed to spindle 25 and has a first annular tooth array 63 on rear face 61. An input clutch plate 59 of clutch 55 is axially and nonrotatably fixed in tool housing 15 and has a second annular tooth array 67 on a forwardly inclined front face 65. Tooth arrays 63, 67 are engageable in the hammer mode. Output clutch plate 57 is shiftable in use in the hammer mode to position the rear face 61 generally parallel to the front face 65.