Abstract: A power tool with a drive motor and a drive belt guided about a drive pulley and an output pulley has a tool driven by the drive motor through the drive belt. A tensioning device is provided that changes a spacing between the drive pulley and the output pulley and has at least one tensioning position and at least one release position. In the at least one tensioning position, the drive pulley and the output pulley have a first spacing relative to one another and in the at least one release position have a second spacing to one another that is smaller than the first spacing. The drive belt is an elast belt and the tensioning device, as a result of inherent tension of the elast belt, is secured in the at least one tensioning position.

Abstract: Embodiments of an accessory attachment for a rotary power hand tool are disclosed wherein the hand tool is of the type which has a tool housing with a preferably cylindrical nose portion, a motor having a motor drive shaft with a mounting coupling extending forwardly from the nose portion for receiving a drive shaft, the attachment including a housing having a first end portion configured to be mounted to the tool housing nose portion and an input shaft for coupling to the motor drive shaft, and having an enlarged second end portion oriented at a right angle relative to the first end portion and also having an output shaft coupled to the input shaft at a preferably right angle relative thereto, a rotary cutting wheel mounted to the output shaft and substantially disposed within the enlarged second end portion, excepting an exposed portion of the rotary cutting wheel for engaging a work surface, and a removable cover configured to engage said enlarged second end portion to at least partially enclose said rotar

Abstract: A pipe cutting and bevelling tool has a saw blade or abrasive disc and bevelling cutters or abrasive-coated drums extending through a slot in a first guide plate, the saw blade or abrasive disc and bevelling cutters, or abrasive-coated drums being driven by a suitable engine or motor. By selective angular adjustment of a second guide plate relative to the first guide plate the tool can cut and bevel pipes of a range of diameters, or cut different bevel depths in pipes of a given diameter.

Abstract: A circular saw including a motor housing having a first end portion and a second end portion, a motor assembly disposed within the housing, a rotary blade assembly having a predetermined weight mounted to the first end portion of the motor housing, and a battery pack having a predetermined weight disposed on the second end portion of the motor housing. The battery pack and the rotary blade assembly are configured and arranged to be in longitudinal alignment with one another, and the longitudinal alignment of the battery pack with the rotary blade assembly promotes counterbalancing between the predetermined weight of the rotary blade assembly and the predetermined weight of the motor housing.

Abstract: A pipe cutter is designed for cutting a pipe from the inside by insertion of the pipe cutter through an open end of the pipe. The pipe cutter includes an elongated hollow sleeve with first and second ends in which an elongated shaft which is longer than the hollow sleeve is located for rotation. One end of the elongated shaft is adapted for connection to a source of rotational power; and the lower or opposite end of the elongated shaft is attached to a rotary saw blade. A centering housing is located between the first and second ends of the hollow sleeve and includes a mechanism for moving the sleeve and the elongated shaft located in it from an initial position with the saw blade out of contact with the interior of the pipe to a position radially outward from the central axis of the pipe to engage and cut the pipe through a circular or orbital motion of the pipe cutter.

Abstract: A cutting or sawing machine (1) comprising a machine body (3), at least one disc shaped, rotatable tool (16a, 16b), an elongated tool carrier (14) having the substantial shape of a flat bar having a front end and a rear end, two opposite broad sides and two opposite edge sides, said rear end being connected to the machine body. The tool carrier comprises at least two elongated side walls (24, 25), a first elongated side wall (24) on one broad side of the tool carrier, a second elongated side wall (25) on the opposite broad side, said first and second side walls being essentially parallel with each other, and the front part of either one of the side walls or of a possible central elongated member (25) between the first and second side walls is provided with a bearing hole (28a) intended to carry a bearing of sliding contact type or of rolling contact type, i.e.

Abstract: A rotatable cutting tool unit of a tool assembly for a cutting machine that is used in conjunction with an associated method of cutting provides several novel aspects. The tool arrangement, which includes two tool units, includes first and second disk-shaped tools rotatable about an axis. The tools define maximum tool arrangement boundaries along the axis. A driving arrangement, at an axial location between the first and second tools, supports the first and second tools for rotation and transfers driving force. A radially outer periphery of the driving arrangement is at a radius less than a radius of a peripheral cutting edge portion of the first tool and less than a radius of a peripheral cutting edge portion of the second tool.

Abstract: A preferred embodiment of the preferred invention comprises a right angle attachment for a power hand tool of the type which has a generally cylindrical elongated housing with a motor contained within the housing or case and the motor having an output shaft that extends from the nose end of the hand tool. The attachment has a housing with a mounting end that fits on the nose end portion of the tool housing, with the housing having an input shaft and an output shaft that are operably coupled together by bevel gears attached to each shaft. A magnet is mounted on the output shaft near an electric circuit located within the housing for producing current that drives the LED's. Since the magnet and the circuit are inside the housing, a lens is provided in the housing adjacent the light producing device for emitting light to the exterior of the housing and toward the tool attached to the distal end.

Abstract: A machine such as a saw, jointer, planer, etc. is disclosed. The machine has cutting tool, a direct drive mechanism configured to move the cutting tool, a detection system adapted to detect the occurrence of an unsafe condition between a person and the cutting tool, and a reaction system adapted to mitigate the unsafe condition upon the detection of the unsafe condition by the detection system. An electrical signal is imparted on the cutting tool, and the signal is used to determine the occurrence of the unsafe condition. The direct drive mechanism is electrically isolated so that the electric signal may be imparted on the cutting tool. The electric isolation may be achieved through configurations such as insulated bearings, a substantially non-conductive housing, and a substantially non-conductive coupling joining two shaft portions.

Abstract: A portable electric cutting device includes housing, a saw blade, a saw cover, a base linked to the housing, and a centrifugal fan. The saw cover has a partition wall formed with a plurality of division walls including front and rear divisional walls. The plurality of division walls have an inclined part that extends at an angle with respect to a radial direction of the rotary axis of the fan such that a radially outer part of the inclined part locates upstream from a radially inner part of the inclined part with respect to the rotary direction of the fan.

Abstract: A movable handle and a power tool. The power tool comprises a housing, a motor supported by-the housing and operable to drive a tool element about an axis, and a handle supported by the housing for rotation relative to the housing about the axis. Preferably, the power tool is a circular saw. The circular saw further comprises a switch assembly supported on the handle for movement with the handle and means for connecting the switch to the motor to accommodate movement of the switch relative to the motor. The switch assembly is electrically connectable to the motor and selectively connects the motor to a power source, and the connecting means includes a wiring arrangement. The circular saw further comprises a locking assembly for locking the handle in a position relative to the housing.

Abstract: A tool unit for a handheld power tool having an oscillating output unit, having a fastening means (3) for attachment to the output unit, and having a working edge (4) that transitions into a lateral boundary line (7, 8, 12, 13, 16, 17). The working edge (4) is arc-shaped.

Abstract: A circular saw has one or more louvers in the housing which direct air exiting the housing toward a work piece, together with openings in other components of the saw located between the louvers and the work piece so that sawdust and other debris that is produced during operation of the saw will be blown out of the way and will not interfere with the line of sight of the user.

Abstract: A power cutter comprising: a housing 2; an engine 24 mounted within the housing 2; a support arm 7 mounted on the housing and which projects forward of the housing; a blade mounting mechanism 70,90, 86, 92 rotatably mounted on the end of the support arm and which is capable of being rotationally driven by the engine 24 when the engine is running; a liquid fuel aeration mechanism 126 to generate aerated fuel for the engine; an air intake 314 for the provision of air for the liquid fuel aeration device 126; an air filtration mechanism 316 to filter the air drawn in from the air intake for the liquid fuel aeration mechanism; a fuel tank 124 for providing fuel to the liquid fuel aeration mechanism; and an exhaust 146 through which the exhaust gases generated by the operation of the engine are expelled; wherein the air filtration mechanism comprises an air filter 320 comprising a plurality of pleats which hang substantially vertically downwardly when the power cutter is in its standard orientation.

Abstract: A power cutter comprising: a housing 2; an engine 24 mounted within the housing 2; a support arm 7 mounted on the housing and which projects forward of the housing; a blade mounting mechanism rotatably mounted on the end of the support arm and which is capable of being rotationally driven by the engine 24 when the engine is running; a cutting blade having a circular central hole and which mounts on and is rotationally driven by the blade mounting mechanism; a liquid fuel aeration mechanism 126 to generate aerated fuel for the engine; an air intake 314 for the provision of air for the liquid fuel aeration device 126; an air filtration mechanism 316 to filter the air drawn in from the air intake for the liquid fuel aeration mechanism; a fuel tank 124 for providing fuel to the liquid fuel aeration mechanism; and an exhaust 146 through which the exhaust gases generated by the operation of the engine are expelled; wherein the blade mounting mechanism comprises: a spindle 70 rotatably mounted on the support arm and

Abstract: A cutting tool that maintains a compact-sized main body without affecting the usability as well as the dust collecting operation is provided. In a dust cover mounted on a blade case, a dust collection route divided from a saw blade is formed, and an outlet is provided at the rear side of the blade case in the cutting direction. Moreover, the blade case includes a peripheral surface in which an inlet and an auxiliary inlet are provided for guiding air generated by the rotation of the saw blade into the dust collection route from the front side in the cutting direction. Further, a guiding route where a part of cooling air for the motor is introduced into the dust collection route by means of a duct is provided, whereby the cooling air as well as air guided from the inlet is introduced into the dust collection route.

Abstract: A power tool, a saw and a circular saw. The power tool may include a handle including a support portion movably supportable on the housing portion and extending substantially about the circumference of the housing portion. The support portion may include a second end movable relative to a first end such that the support portion selectively applies a force to the housing portion. The saw may include a bevel angle detent mechanism in which one of the detent member and the recess is angularly adjustable relative to the associated one of the detent support and the recess support to adjust the predetermined bevel angle position. A bevel angle detent mechanism may include an engagement operating assembly operable between a detent engagement-enabled condition, in which the detent member is engageable in the recess, and a detent engagement-prevention condition, in which the detent member is prevented from engaging the recess. The circular saw may include a spindle lock assembly.

Abstract: A modular power tool (10) incorporates a modular drive system (14, 18, 22) and modular handle set (12) that is reversible or use with both a left and right hand configuration. The modular drive system (14, 18, 22) and handle set (12) of the modular power tool (10) of this invention reduces the need for derivative circular saw designs by introducing common components.

Abstract: A hand-held power tool (2) includes an angle drive (20) for connecting the motor-driven driving shaft (6) and the driven shaft (10) connected with a tooth holder (24) for joint rotation therewith, and having drive toothing (14) provided on the drive shaft (6) and driven toothing (16) provided on the driven shaft and cooperating with the drive toothing (14) for driving the driven shaft (10) in the driven direction (DAb) in response to the drive shaft (6) being driven in the drive direction (DAn), with the driven toothing (16) being inclined over its circumference (36) in a direction opposite the driven direction (DAb), and with the driven shaft (10) having an axial stop (30) for limiting an axial displacement backlash of the drive shaft (6) relative to the driven shaft (10).

Abstract: A toe kick saw including a driver having a safety feature to allow a saw blade to disengage during experience of increased torque. The toe kick saw driver may include a one or two piece driver that engages the saw blade that is able to yield by deforming when the blade experiences an increase in torque sufficient to cause kickback. Alternatively the toe kick saw could include a yieldable spindle extension.

Abstract: A battery powered circular saw includes a rechargeable battery removably attached to the housing and an adjustable shoe pivotally attached to the housing for controlling a depth of cut. A locking mechanism for preventing relative movement between the adjustable shoe and the housing includes a clamp that is located so as to permit the battery pack to be inserted to and removed from a rear end of the housing in a direction that is generally parallel to a plane in which the circular saw blade is disposed.

Abstract: Embodiments of an accessory attachment for a rotary power hand tool are disclosed wherein the hand tool is of the type which has a tool housing with a preferably cylindrical nose portion, a motor having a motor drive shaft with a mounting coupling extending forwardly from the nose portion for receiving a drive shaft, the attachment including a housing having a first end portion configured to be mounted to the tool housing nose portion and an input shaft for coupling to the motor drive shaft, and having an enlarged second end portion oriented at a right angle relative to the first end portion and also having an output shaft coupled to the input shaft at a preferably right angle relative thereto, a rotary cutting wheel mounted to the output shaft and substantially disposed within the enlarged second end portion, excepting an exposed portion of the rotary cutting wheel for engaging a work surface, and a removable cover configured to engage said enlarged second end portion to at least partially enclose said rotar

Abstract: A rotating blade for a cutting machine. The blade defines an arbor hole for an arbor typically having at least three sides. The preferred arbor hole includes first and second sides each of which conform to adjacent sides of the arbor, a short side joining the first and second sides, a third side connected to the first side, and a fourth side connecting the third side to the second side.

Abstract: A movable handle and a power tool. The power tool comprises a housing, a motor supported by the housing and operable to drive a tool element about an axis, and a handle supported by the housing for rotation relative to the housing about the axis. Preferably, the power tool is a circular saw. The circular saw further comprises a switch assembly supported on the handle for movement with the handle and means for connecting the switch to the motor to accommodate movement of the switch relative to the motor. The switch assembly is electrically connectable to the motor and selectively connects the motor to a power source, and the connecting means includes a wiring arrangement. The circular saw further comprises a locking assembly for locking the handle in a position relative to the housing.

Abstract: A cable cutter for attachment to a power drill has a housing, first and second cutting blades connected to the housing for movement relative to one another and a drive assembly releasably engageable with the chuck of the drill and operatively engaged with at least one of the cutting blades. The drive assembly includes a worm mounted on a drive shaft, a worm gear and a drive gear mounted on a main shaft, and a segment gear formed on one of the cutting blades. The worm and worm gear which are in engagement, as are the drive gear and segment gear. The main shaft is supported in the housing by three bearings. A torque arm is attached at one end to the housing and adapted at its other end to engage the handle of the drill. A reversible stabilizing handle attaches to the housing to allow the user to securely grip the housing during cutting operations.

Abstract: A circular saw assembly of the type that includes a motor housing, a handle coupled to the motor housing, a generally circular saw blade disposed within a blade housing at a first end of the motor housing, and a foot member through which the blade extends for guiding the saw assembly along a work surface, where the circular saw assembly including a depth of cut locking system and an angle of cut locking system. The depth of cut locking system includes an arcuate bracket with an arcuate slot, and an engagement member extends through the slot and is operatively connected to the motor housing and slideable in the arcuate slot. The angle of cut locking system includes a bracket having an arcuate slot and an engagement member movable in the slot and configured to the bracket. A biasing member is provided to bias the engagement member, and at least one detent recess is provided to retain the engagement member therein.

Abstract: A portable circular saw includes a housing, a motor, a circular saw blade, a saw cover, and a light irradiation unit. The motor is accommodated in the housing. The circular saw blade is driven by the motor for cutting a cutting object in a cutting direction. The circular saw blade has one side surface and another side surface. The saw cover is provided to the housing for partially covering the circular saw blade. The light irradiation unit is provided on the saw cover. The light irradiation unit includes a first irradiation device located on the one side surface side of the circular saw blade and a second irradiation device located on the another side surface side of the circular saw blade for emitting a light to illuminate a region including a leading end portion of the circular saw blade and a spot on the cutting object. The spot is ahead of the leading end portion in the cutting direction.

Abstract: A portable cutting device capable of changing and adjusting a cutting depth of a circular saw blade relative to a base with lesser labor. A saw cover has one end portion pivotally connected on the base, and another end pivotally movable toward and away from the base to change the cutting depth. An adjustment guide extends from the base in a pivotally moving direction of the saw cover in a superposed relation to the saw cover. A tightening unit is disposed to the saw cover at a position superposed with the adjustment guide and the saw cover for providing a selective tightening between the saw cover and the adjustment guide. The tightening unit includes a shaft part extending through the saw cover and the adjustment guide, a pivot operation part pivotally movable about an axis of the shaft part, and an urging part disposed over the shaft part and movable by the pivot operation part in the axial direction of the shaft part.

Abstract: A lawn cutting device includes a handle having a hollow connecting part that has a bottom end portion defining a bottom opening and a driving member having an output shaft that is received in the connecting part of the handle and that extends outwardly through the bottom opening. The device also includes a blade-mounting seat spaced apart from the bottom end portion of the connecting part of the handle, and aligned coaxially with and secured to the output shaft. The device further includes a blade member mounted on the blade-mounting seat; and a protecting member including a cup-shaped body that is coaxially aligned with and that extends from the blade-mounting seat, and that defines a recess which receives the bottom end portion of the connecting part of the handle therein.

Abstract: Fanned air generated by a fan to cool a motor is discharged from a housing through fanned air discharge ports toward an opening formed in a base. The fanned air discharged toward the opening is then introduced into a groove in fluid communication with the opening. The groove is formed in a bottom surface of the base and has an open side at a front side of the base. The fanned air is then discharged from the front side of the base, blowing off saw dust on a cutting object so as to prevent dust from accumulating on a marking line on the cutting object.

Abstract: A movable handle and a power tool. The power tool comprises a housing, a motor supported by the housing and operable to drive a tool element about an axis, and a handle supported by the housing for rotation relative to the housing about the axis. Preferably, the power tool is a circular saw. The circular saw further comprises a switch assembly supported on the handle for movement with the handle and means for connecting the switch to the motor to accommodate movement of the switch relative to the motor. The switch assembly is electrically connectable to the motor and selectively connects the motor to a power source, and the connecting means includes a wiring arrangement. The circular saw further comprises a locking assembly for locking the handle in a position relative to the housing.

Abstract: A food slicer comprises a fan-cooled electrically powered motor driving a slicer blade. The motor is mounted within an enclosure which comprises at least one air intake port and at least one exhaust port on opposite sides of one nominally air-tight first partitioning wall within the enclosure to confine the flow of cooling air from the air intake port through the enclosure, then into intimate contact with the electrical windings and components within the frame of the motor. The motor frame is sealed into a closely conforming contacting aperture in the first partitioning wall. The fan is mounted immediately adjacent to a non-contacting aperture in a second partitioning wall within the enclosure juxtaposed the exhaust port.

Abstract: Fanned air generated by a fan to cool a motor is discharged from a housing through fanned air discharge ports toward an opening formed in a base. The fanned air discharged toward the opening is then introduced into a groove in fluid communication with the opening. The groove is formed in a bottom surface of the base and has an open side at a front side of the base. The fanned air is then discharged from the front side of the base, blowing off saw dust on a cutting object so as to prevent dust from accumulating on a marking line on the cutting object.

Abstract: A method of assembling a power tool, a power tool, a method of assembling an electrical device, and an electrical device includes a switched reluctance motor. The electrical device is preferably a hand-held power tool, however, any type of electrical device that includes a switched reluctance motor may benefit from any number of aspects of the invention. In one independent aspect, the invention provides a construction that reduces tolerance stack-up. In another independent aspect, the invention provides a self-contained electronics package that plugs into a switched reluctance motor to provide control operation of the switched reluctance motor. In another independent aspect, the invention provides enhanced cooling that increases the efficiency of the electrical device using a switched reluctance motor. In another independent aspect, the invention provides an encapsulated magnet that allows for contaminant free motor control over the life of the SR motor.

Abstract: A hand-operated circular saw having blade cutting depth the adjustment device includes a hollow interior tubular body having a hand grasp portion, a head portion, a motor disposed in the head portion to operate a threaded axis protrude from a threaded circular protrusion on an outer side of head portion, an upper plate secured to the outer side including a circular hole engaged with the circular protrusions, a pair of pivotal tubes and a pair of horizontal arc protrusions on the top, a guard plate, a pad ring, an internally thread tube and a saw blade sequentially secured to the axis, a lower plate connected to a pair of cylinder rods inside the pivotal tubes, a pair of quickly operated bolts in the top of the pivotal tubes for adjusting the vertical positions of the lower plate and the saw blade, and a cutting depth adjustment device.

Abstract: A saw with a safety system is disclosed. The safety system includes a detection system adapted to detect contact between a person and a blade while the blade is moving. The safety system further includes a brake system adapted to engage the blade and to stop the blade when the detection system detects contact between the person and the blade.

Abstract: An air jet for a machine tool to clean cutting dust has a housing with a hole and an outlet. An eccentric member has a cam and is provided in the housing which the eccentric member is driven by a power resource of the machine tool for rotation. An annular transmission is engaged with the eccentric member. A driving member is driven by the transmission for linear reciprocating motion. A flexible film is provided in the housing covering the outlet and has an inlet corresponding to the driving member, wherein the inlet of the film is sealed and the film is pressed for strain while the driving member is moved toward the film, and a tube has an end thereof connected with the outlet.

Abstract: A battery powered circular saw includes a rechargeable battery removably attached to the housing and an adjustable shoe pivotally attached to a guard assembly for controlling a depth of cut. A locking mechanism for preventing relative movement between the adjustable shoe and the housing includes a depth of cut strap disposed adjacent a first sidewall of the housing. A lever is disposed adjacent a second sidewall of the housing. A tightening element interconnects the depth of cut strap and the lever. The battery powered circular saw additionally includes a handle extending from the housing. The handle is disposed substantially parallel to a direction of cut and oriented horizontally above the housing. The rechargeable battery pack includes a pair of laterally spaced apart guide rails which cooperate with the pair of longitudinally extending grooves to permit sliding movement of the rechargeable battery pack in a direction parallel to the direction of cut.

Abstract: A cut alignment device for a rotary saw having a motor which spins a cutting unit which includes a rotary shaft driven by the motor, a circular blade having a central aperture through which the shaft fits, and a blade mounting device for holding the blade on the shaft. The cut alignment device includes a battery power source carried by the cutting unit; and a beam light source, operatively connected to this power source, and carried by the cutting unit. The light source projects a light beam at a shallow angle from the cutting unit directed to intersect the plane of the rotary cutting tool or saw blade, to assist the operator in cutting accurately.

Abstract: A modular power tool incorporates a modular drive system and modular handle set that is reversible for use with both a left hand and right hand configuration. The modular drive system and handle set of the modular power tool of this invention reduces the need for derivative circular saw designs by introducing common components.

Abstract: A circular saw includes a base member abutting a supporting surface and an operating arm pivotally mounted to the base member. A gearbox is formed on a free end of the operating arm. The gearbox includes a first cavity and a second cavity respectively laterally defined in two opposite side of the gearbox. A hole is laterally defined in a bottom of the first cavity and communicates with the second cavity. A handle extends from the gearbox for user to easily operate the circular saw. A motor is laterally securely mounted to the bottom of the first cavity and partially received in the first cavity in the gearbox. A blade device is laterally mounted to the second side of the gearbox and connected to the motor so that the blade device is driven when the motor is operated.

Abstract: A battery-operated hand power tool (10), in particular a power saw (101), having a housing (12) into which a battery pack (28) can be detachably inserted in captive fashion, and between the battery pack (28) and the housing (12), an elongated auxiliary tool (38) is stored, in particular for releasing the tool, preferably the saw blade, is made more secure and convenient to manipulate by disposing the auxiliary tool (38) in such a way that it is visible from outside and is easy to feel, and in particular can be reached through.

Abstract: A chamber is formed in the upper end of a brush saw cutting head housing. The brush saw cutting element drive spindle's upper end projects into the chamber. The drive spindle's lower end projects beneath the housing and is drivingly couplable to the cutting element. A disc is mounted against the underside of the cutting element. A cavity is formed in the disc. At least one channel extends through the disc, between the cavity and the disc's external rim. An aperture extends through the drive spindle, between the chamber and the cavity. Herbicide supplied to the chamber flows from the chamber, through the drive spindle aperture, into the cavity. The drive spindle rotates the disc. Centrifugal force imposed on herbicide within the cavity forces the herbicide through the channel(s) onto the underside of the cutting element, for transfer onto the stumps of material cut by the element.

Abstract: A rotatable cutting tool unit of a tool assembly for a cutting machine that is used in conjunction with an associated method of cutting provides several novel aspects. The tool arrangement, which includes two tool units, includes first and second disk-shaped tools rotatable about an axis. The tools define maximum tool arrangement boundaries along the axis. A driving arrangement, at an axial location between the first and second tools, supports the first and second tools for rotation and transfers driving force. A radially outer periphery of the driving arrangement is at a radius less than a radius of a peripheral cutting edge portion of the first tool and less than a radius of a peripheral cutting edge portion of the second tool.

Abstract: A saw is disclosed having a detection system adapted to detect a dangerous condition between a person and a saw blade, and a brake adapted to stop the saw blade in response to detection of the dangerous condition. The saw further includes a brake positioning system that allows the brake to be positioned in at least two different operable positions to accommodate at least two different blade diameters. The saw may include a system to detect brake-to-blade spacing.

Abstract: A locking assembly for a portable, engine-powered, hand tool, such as a clearing saw. To facilitate removal and installation of a rotatable cutting tool (13), a rotatable shaft (11) driving the cutting tool is locked against rotation by a movable locking pin (17) of magnetic material that is secured in a locking position by a magnet (19) carried by a housing of the tool supporting the rotatable shaft.

Abstract: A bi-directional rotation pneumatic cutting machine includes an operation section which has an actuator to drive an output shaft to rotate in two directions and a fastening mechanism coupled on the output shaft. The fastening mechanism includes a coupling head which has first reverse threads formed in the interior for fastening to the output shaft, an anchor member engaged with the coupling head with second reverse threads formed thereon, and a fastener which has first positive threads formed thereon to run through the anchor member and engage with second positive threads formed on the output shaft. The positive threads and the reverse threads are engageable with each other to allow the pneumatic cutting machine to rotate in a positive direction or a reverse direction according to different requirements without loosening and direct sparks, cutting debris or dusts generated in cutting processes in a desired direction without polluting environment or hurting people and working pieces.

Abstract: A battery (4) driven circular saw includes a housing (1a) with a motor (3) for driving the circular saw blade (2). The circular saw blade (2) is fixed to a drive shaft (7) that runs transverse to the plane (E) of the circular saw blade (2), the drive shaft being functionally connected by means of a linkage (15) to the motor (3). In order to achieve the most compact construction possible of the circular saw, the axis of rotation (R) of the motor (3) runs parallel to the plane (E) of the circular saw blade (2).

Abstract: A hand held wall cutter having handles, a drive unit, a housing enclosing a motor, and a circular cutting disc. A handle is attached to the housing at one of its ends. The drive unit is coupled to the housing at one of its ends and the circular cutting disc is attached to the drive unit's second end. Handles are attached to either side of the drive unit for controlling the device. The wall cutter enables cutting through of walls, ceilings and other substantially planar objects without previous invasion of the object.

Abstract: An electric hand power tool has a housing, a rotatably driven tool, a protective hood which at least partially covers the tool, a handle and an auxiliary handle for a two-hand guidance of the power tool, wherein the auxiliary handle is hollow and formed as a withdrawal passage for a removed material thrown from the rotatably driven tool.