Abstract: A brake device for a power tool has a brake assembly, a bearing portion, a pinion and a gearbox. The brake assembly includes a brake base, a cover, a first throttle cable, a second throttle cable, a brake-activating block, a brake-guiding pillar, a brake band and a brake drum. The first throttle cable, the brake-activating block and the second throttle cable are linearly connected together in series. The brake-activating block is designed to abut against the brake-guiding pillar in a brake position and a release position, respectively. With the relative movement among the first throttle cable, the brake-activating block and the brake-guiding pillar, the abutting or separating state between the brake band and the brake drum can be easily controlled.

Abstract: A chain saw automatic tensioner preferably includes a base plate, a chain bar, a tensioning cylinder, a sliding block and a pusher block. The base plate includes a sliding slot that is sized to slidably receive the sliding block. The chain bar includes a substantially half oval shape that is sized to retain a cutting chain. An end of the chain bar is retained between a top of the sliding block and a bottom of the pusher block. The tensioning cylinder is mounted to the base plate opposite the sliding slot. Hydraulic oil in the tensioning cylinder forces a cylinder rod and the pusher block secured to the chain bar away from a chain sprocket and thus tensioning the cutting chain.

Abstract: A portable handheld work apparatus such as a motor-driven chain saw (1) includes a housing (2) wherein an internal combustion engine (10) and a carburetor (11) are mounted. A throttle lever (6) is provided which is pivotally journalled on a handle (3). The handle (3) is connected to the housing (2) via at least one antivibration element (33). A vibration gap (9) is configured between the handle (3) and the housing (2). A transmitting unit (13) is provided for transmitting the pivot movement of the throttle lever (6) to the carburetor (11). The transmitting unit includes a rigid transmitting element (17, 37) which bridges the vibration gap (9).

Abstract: A metal frame having at least one wheel attached in a way that permits the frame to be moved from one location to another. Attached to the frame is a chain saw that can be used in more than one cutting position using remote controls attached to the metal frame and controlled by the operator. The operator controls the saw's cutting position either vertically or horizontally with a tension rope that moves the saw to the desired cutting position. The saw's throttle is controlled by a flexible cable attached to a throttle assembly at the saw and a handle attached to the right side of the metal frame allowing the operator to control the cutting speed of the chain saw from high rpm to idle speed.

Abstract: The ice axe for mountaineering includes a head, a shaft, and an anatomical grip having one free end and an end secured to the shaft. The grip defines a handling zone of the ice axe and includes an adjusting member for adjusting the length of the handling zone. The adjustment member includes an adjustment end-piece arranged at the free end of the grip. The handling zone is bounded by the adjustment end-piece and by a protuberance of the grip at its end secured to the shaft. The adjustment end-piece is mounted on and pivoted around a rotation pin. The free end of the grip includes a plurality of notches operating in conjunction with a plurality of grooves of the adjustment end-piece and corresponding to different positions of the adjustment end-piece.

Abstract: The invention relates to a hand-operated tool with handle (1) with a handle section (2) on the user side and with a foot section (3) arranged on the bottom side of the handle section (2) and with a detachable one-piece upper handle shell (8) that covers at least substantially the handle section (2) on the user side and the foot section (3) on the bottom or ground side.

Abstract: A chainsaw is provided having a brake band disposed about a drum that rotates during advancement of the saw chain about the saw bar. An end of the brake band is biased to a position that draws the brake band tight about the drum to prevent advancement of the saw chain, and the throttle trigger of the chainsaw is associated with this biased end to push the band against the bias and release the drum when the throttle trigger is squeezed to drive the elements of the chainsaw that serve to advance the saw chain. Also provided are new concepts for associating throttling and braking elements with the throttle trigger.

Abstract: A chain saw bar tensioning apparatus is disclosed comprising a sliding member having a recess formed therein. The sliding member is adjacent to a first tensioning member that biases the sliding member in a direction such that when the apparatus is incorporated into a chain saw bar and mounted to a chain saw having a mounting stud, the sliding member is biased towards the mounting stud. The apparatus further comprises a latch adjacent to a second tensioning member. The recess of the sliding member is configured to receive the latch and the second tensioning member biases the latch towards the sliding member such that, when the sliding member is forced in a direction away from the mounting stud, the latch will eventually enter the recess and prevent the sliding member from moving towards the mounting stud.

Abstract: A manually operated implement such as a chain saw, a parting-off grinder or similar device has an internal combustion engine to drive a tool and a handle arrangement to operate the implement. The handle arrangement is connected to the internal combustion engine via a vibration damping system, the vibration damping system comprising at least one anti-vibration element. In order to achieve good vibration damping and sufficient operational rigidity in all operating ranges, in at least one direction of vibration in a predetermined frequency range the anti-vibration element has a first characteristic curve in a first state and a second characteristic curve in a second state and the anti-vibration element can be switched between the first state and the second state.

Abstract: The present invention is an electric pole saw featuring a novel saw powerhead mounting bracket assembly comprising interlocking bracket halves molded to conform to the opening and contours of the saw provided between the rear handle, knuckle guard and main body of the saw, to control angular movement or twisting between the bracket-halves and between the powerhead and the bracket, and also utilizing single-point fastening means for fast and easy assembly of the bracket without tools.

Abstract: The present invention is directed to a wireless electrical control system for power tool and specifically to a wireless control device for a router. The electrical control system may include a handle suitable for manipulating a router. A switch and a wireless transmitter are disposed in the handle. Communicatively coupled to the transmitter is a wireless receiver capable of receiving the transmissions from the transmitter in the handle. In alternative embodiments the wireless receiver is disposed in the router itself or the receiver is disposed in an outlet unit, which is capable of electrically coupling to the router's electrical cord and an electrical outlet. The wireless receiver of the present invention is capable of controlling the flow of electricity to the electrical system of the router so that the router is capable of being altered from the switch mounted on the handle, thus allowing users to change the power setting while retaining secure control of the router.

Abstract: An antivibration device is mounted between a motor unit (1) having an internal combustion engine (2) and a vibration-insulated unit (3) of a portable handheld work apparatus (4) such as a motor-driven chain saw, cutoff machine, suction/blower apparatus or the like. The antivibration device (5) includes a vibration damper (6) made of foamed elastic material (7).

Abstract: A chain saw which includes chain tensioning and braking systems. Tensioning and braking are caused by the presence and control of longitudinal and lateral slits in an elongated support which provides a continuous chain channel guide in its outer circumference.

Abstract: A chain saw handle extension that includes an attachment mechanism at the far ends thereof for securement to a top and a bottom of a chain saw; and a clamping structure attached to the attachment mechanism that is clampable about the bottom of an existing chain saw handle and a bottom end of the extension; the extension including a speed control trigger connectable to the control trigger of an existing chain saw that is located such that the speed control trigger of the chain saw handle extension is positioned well behind the existing trigger of the chain saw; each of the attachment structures at the end of the V-shaped structures including a threaded knob which is threadable into a threaded aperture that is provided within a body of a chain saw attached to the existing chain saw handle.

Abstract: The present invention is an extended reach tree maintenance apparatus. The invention is comprised of a lightweight electric chain saw, at least two hollow and stackable extensions poles, a bracket, several fasteners, and a wireless ON/OFF switch. The bracket is attached to a handgrip at one end of the lightweight chain saw and has a coupler fixed along its length that facilitates its secured yet removable attachment with one extension pole. At least three fasteners pass through the bracket and contact the chain saw securing the bracket to the chain saw. One fastener depresses the trigger switch of the chain saw in the ON position. The wireless receiver switch is electrically connected to the chain saw and remotely operable via a wireless transmitter. In other embodiments, the invention further comprises a switch electrically connected between the chain saw and the wireless ON/OFF switch and fastened to an extension pole.

Abstract: A safety device includes a trigger for activating a first switch and a brake device for braking the output shaft of the electric tool. The trigger is controlled by a safety button that pivots a pivotal member that is engaged with a rotatable member when an intermediate member of the brake device is shifted by operating the brake device. The rotatable member matched with the pivotal member is rotated to activate a second switch. The electric power is provided to the output shaft when both the first and second switches are activated.

Abstract: A brake triggering device with a pivotably mounted trigger arm (1) located in connection to a handheld working tool's, mainly a chain saw's (2), rear handle (3), with a throttle control (4) and a handle opening (5) located below the handle (3), so that the trigger arm (1), when the saw changes inclination in relation to the operator's forearm, e.g. at the event of kickback or fall, is actuated by the operator's hand or arm, whereby the trigger arm (1) via a transfer mechanism actuates a brake (9) so that this stops the movement of the saw chain. The pivot (10) of the trigger arm is located in connection to a front (11) or a bottom (12) side of the handle opening (5).

Abstract: A saw chain for a motor-driven chain saw (1) is formed from center drive links (10) and lateral connecting links (11). A first radius (18) is the maximum distance of the axis (22) of the leading rivet opening (12) to the region (19) facing toward the forward running surface and lying in the running direction. A second radius (20) defines the maximum distance from the axis (23) of the trailing rivet opening (13) of the connecting link (11), which is next adjacent in the running direction (8), to the region (21) of the connecting link (11). The region (21) lies facing toward the rearward running surface (17) opposite to the running direction (8). The second radius (20) is greater than the first radius (18) and the sum of first radius (18) and second radius (20) corresponds approximately to the distance (b) of the axes (26, 27) of the rivet openings (24, 25) of a drive link (10) arranged between the connecting links (11).

Abstract: A manually operated implement such as a chain saw, a parting-off grinder or similar device has an internal combustion engine to drive a tool and a handle arrangement to operate the implementl. The handle arrangement is connected to the internal combustion engine via a vibration damping system, the vibration damping system comprising at least one anti-vibration element.

Abstract: The invention relates to a device for braking a motor shaft, such as a motor shaft of a chain saw, with a brake band that at least partially surrounds an area of the shaft and with at least one guide component that cooperates with the brake band and holds it in its axial position. The brake band comprises at least one projection formed in one piece with the brake band.

Abstract: A portable work apparatus, especially a motor-driven chain saw (1), has a drive unit which is provided with a handle housing (3). The handle housing (3) includes an extension (9) which extends in the longitudinal direction of the work apparatus from a rearward handle (8) on the side facing away in the longitudinal direction from a guide bar (6) forward to the side facing toward the guide bar (6). The handle housing (3) is connected via antivibration elements to the drive unit. The work apparatus has a forward handle tube (4), which extends over the work apparatus transversely to the longitudinal direction and is attached with an end (10) to the free end of the extension (9) and with the other end (27) in the area of the rearward handle (8). At least one of the ends (10, 27) of the handle tube (4) is fixed via an antivibration element (11, 25, 26, 28, 34).

Abstract: The invention relates to a hand-operated tool with handle (1) with a handle section (2) on the user side and with a foot section (3) arranged on the bottom side of the handle section (2) and with a detachable one-piece upper handle shell (8) that covers at least substantially the handle section (2) on the user side and the foot section (3) on the bottom or ground side.

Abstract: A safety switch of a screwdriver has a driver body. The safety switch of a screw comprises a push unit; a trigger pivotally installed on the driver body; a receiving space being formed within the trigger for receiving the push unit; a safety rod; one end of the safety rod being installed at a lower end of the driver body; and another end of the safety rod being installed below the trigger. The push unit comprises: a torsion spring and a resisting unit pivotally installed to the trigger; one end of the torsion spring resisting against the resisting unit; and a roller pivotally installed to the trigger and installed at a pushed end of a valve rod. By above structure, the screwdriver can be operated safety by controlling the actuation of the safety rod.

Abstract: A chain saw chain braking system, positioned in a continuous channel guide through which chain linking elements slide freely during use, unless the slidability is impeded by its operation.

Abstract: The invention entails a motor saw which includes a brake system for braking the motor, and which further includes a brake-system actuation arrangement comprising a lever and a positioning element which lever is held by the positioning element in a defined position and can be deflected in order to actuate the brake system. The positioning element of the actuating system engages with parts of the brake system, the positioning element limits the movement of the lever in a non-actuated brake system with a first force and the positioning element limits the movement of the lever with a second force in an actuated brake system by engaging with the brake system.

Abstract: A battery operated chain saw including a frame, an electric motor and a battery. The frame includes a housing and a chain bar. The frame forms a front handle and a rear handle. The electric motor is connected to the frame. The battery is coupled to the electric motor. The battery is located at a position on the frame proximate the front handle to provide a front-to-rear chain saw center-of-gravity located proximate the front handle. The battery is part of a power pack removably connected to the frame. The power pack is located spaced from a front-to-rear centerline of the frame located along the chain bar. The power pack includes an electrical coupling side which is not located on a lateral side of the power pack.

Abstract: A portable handheld work apparatus such as a motor-driven chain saw includes a housing (6) of a drive unit (2). The following are mounted in the housing (6): an internal combustion engine (3), a carburetor (4) for fuel metering and an air filter (5) as well as a fuel tank (8). The air filter (5) is mounted ahead of the carburetor in the flow direction of the fresh air flow. A largest possible filter action is obtained with a compact configuration in that a housing (10) of the air filter (5) lies at least partially in a space between the carburetor (4) and the fuel tank (8).

Abstract: A power tool (10) comprises a main body (12) having a motor driven tool (24) extending from a first front end of the main body, and has a first handle (18) integrally formed on the main body to be remote from this front end. A second support handle (20) is pivotally mounted on the tool body (12) to be pivotally displaceable about a pivot axis (34) so as to be displaceable from a first position in which a grip (22) of the support handle is disposed forwards of the first handle (18), to a second position wherein the grip member (22) is disposed rearwardly of the first handle (18). Also disclosed is the use of restraining means engageable between the support handle (20) and the main body (12) for releasably restraining the handle in either of the first or second positions.

Abstract: A saw chain for a chain saw including alternating center and side link pairs with certain of said side links being cutting links and certain of said center links preceding said cutting links having guard portions to inhibit kick back. Said guard portions including a forward and rearward guard portion, the rearward guard portion in overlapping relation with a depth guide of the cutting link. A relief spacing between the guard portions facilitates chip carriage and the guard portions cooperatively form a ramp to guide wood being cut over and onto the depth gauge for controlling the depth of cut taken by the cutting link.

Abstract: A chain saw handle extension that includes an attachment mechanism at the far ends thereof for securement to a top and a bottom of a chain saw; and a clamping structure attached to the attachment mechanism that is clampable about the bottom of an existing chain saw handle and a bottom end of the extension; the extension including a speed control trigger connectable to the control trigger of an existing chain saw that is located such that the speed control trigger of the chain saw handle extension is positioned well behind the existing trigger of the chain saw; each of the attachment structures at the end of the V-shaped structures including a threaded knob which is threadable into a threaded aperture that is provided within a body of a chain saw attached to the existing chain saw handle.

Abstract: The invention relates to a portable handheld work apparatus including an overhead branch cutter. The work apparatus has a drive motor (4) mounted at one end (2) of a carrier tube (3). A work tool (6) is held at the other end (5) of the carrying tube (3). The work tool (6) is driven via a shaft (7) mounted in the carrying tube (3). A variable work position of the portable handheld work apparatus is made possible by subdividing the carrying tube (3) into two sections (8, 9). The sections (8, 9) can be pivoted relative to each other (pivot angle 11) with respect to their longitudinal axes (52, 51) and are rotatable relative to each other (rotation angle 12) and are connected by a ball-and-socket joint (10). A device is provided for fixing the ball-and-socket joint (10) and permits the ball-and-socket joint (10) to be fixed in the desired position.

Abstract: A chain saw with vibration-isolating devices, capable of providing a desirable vibration-isolating effect over a wide frequency range and reducing accidental deviation from a desired cutting line in a cutting operation. The chain saw includes a main body containing an engine, a frame member mounting a grip handle thereon, and at least two vibration-isolating devices each interposed between the main body and the frame member to support the main body with respect to the frame member. Two of the vibration-isolating devices are disposed spaced apart from each other in the longitudinal direction of the chain saw. Each of the two vibration-isolating devises includes a pair of first and second vibration=isolating members which are different in frequency range for providing a vibration-isolating effect. The two vibration-isolating devices are disposed such that the respective first or second vibration-isolating members are positioned in a first or second diagonal relationship with respect to one another.

Abstract: The present invention relates to a chain saw having a chain bar portion extending forwardly from a main body. The chain saw comprises an attaching portion to which a suspension member is to be attached, and the attaching portion is arranged in the vicinity of a corner portion, where a back surface and a bottom surface of the main body meet with each other, so that a longitudinal center axis of the chain bar portion may be at an angle of not greater than 20 degrees from a vertical line.

Abstract: The present invention is directed to a wireless electrical control system for power tool and specifically to a wireless control device for a router. The electrical control system may include a handle suitable for manipulating a router. A switch and a wireless transmitter are disposed in the handle. Communicatively coupled to the transmitter is a wireless receiver capable of receiving the transmissions from the transmitter in the handle. In alternative embodiments the wireless receiver is disposed in the router itself or the receiver is disposed in an outlet unit, which is capable of electrically coupling to the router's electrical cord and an electrical outlet. The wireless receiver of the present invention is capable of controlling the flow of electricity to the electrical system of the router so that the router is capable of being altered from the switch mounted on the handle, thus allowing users to change the power setting while retaining secure control of the router.

Abstract: A vibration-isolating member is formed of an elastic material, and has a mounting hole at the center thereof, a large diameter section at an end of the mounting hole, a groove at the periphery of the large diameter section, and a flange. One of a vibration-source-side member and a vibration-receiving member is fitted into each of the large diameter section and the groove. An end opposite from the large diameter section is secured to one of the vibration-receiving member and the vibration-source-side member by a mounting member. Since the inside diameter of the large diameter section is larger than any other part of the mounting hole, either of the vibration-source-side member or the vibration-receiving member and the mounting member can be received. The flange prevents the vibration-isolating member from disengaging from one of the vibration-source-side member and the vibration-receiving member.

Abstract: A clutch safety switch of a power chainsaw includes a safety member slidably connected to the casing and a trigger which is not able to be squeezed when the safety member is not slid away. A gear connected to the power source has engaging recesses and a clutch device member is rotatably mounted to an output shaft which is independent from the gear. A link is connected between the safety member and a plate connected to the clutch member which is rotated to engage the output shaft with the gear by sliding the safety member. A lever is connected to the plate which is pivoted by pushing the lever to allow the link to move in a horizontal portion of an L-shaped slot in the plate to make the safety member be pushed back to disengage the clutch device from the gear to release the connection.

Abstract: A tree trimming apparatus is provided for preparing a tree, such as a Christmas tree, for attachment to a tree stand. The tree trimming apparatus includes a raised platform supported by a plurality of legs. The platform also includes an opening for receiving the trunk of a tree. Below the platform is positioned a jaws assembly for affixing the tree in place. Meanwhile, the tree trimming apparatus includes a saw assembly for severing the base of the tree, and a drill assembly for drilling a recess into the bottom of the tree for receipt of the spike of a tree stand.

Abstract: In a chain saw having a sprocket (11), which is supported in rotary fashion in a housing (10) and is for a saw chain (12) guided on a guide (13), and having a chain tension device (14) for longitudinally moving the blade (13), which device has a cam (15) that moves the guide (13) and a rotating member (17) for rotating the cam (15), in order to preset a chain tension that is optimal for operation and is independent of the user, the rotary connection between the rotating member (17) and cam (15) is embodied as a detent overload clutch (18), whose detent overload force is set in accordance with the required chain tension (FIG. 2).

Abstract: A plunge cutting device for use with a portable drill, drill press, or other rotary drive source which is capable of cutting irregularly shaped openings or workpieces in a single operation. A drive chain, belt, or other means carries a plurality of cutting teeth along a path defined by a series of chain guides. A lower plate, adjacent the surface being cut serves as a finer resolution guide for the cutting teeth to define their cutting path. The configuration and orientation of the cutting teeth causes them to push inward against the edge of the plate so that they follow its shape closely. A preferred shield encloses the teeth, chain, and drive mechanism for safety and to serve as a vacuum shroud for dust collection. The shield may also act as a guide, holding the teeth in position prior to the start of the cutting operation.

Abstract: A clutch safety switch of a power chainsaw includes a safety member slidably connected to the casing and a trigger which is not able to be squeezed when the safety member is not slid away. A gear connected to the power source has engaging recesses and a clutch member is rotatably mounted to an output shaft which is independent from the gear. An engaging member is movably mounted to the output shaft and retained in a central hole in the clutch member. A link is connected between the safety member and the clutch member which is rotated and moved toward the gear to let engaging member be engaged with the recesses in the gear to transfer the power to the output shaft.

Abstract: The present invention provides a chain saw having a high degree of safety for its various positions including an upward and a downward position. The chain saw comprises a bar-shaped top handle extending in a lengthwise direction above an upper surface of a main body and a bar-shaped side handle provided next to a left side surface of the main body. When the main body is seen in a plan view, a front end portion of the side handle is intersected transversely with and coupled to a left side surface of a front end portion of the top handle. A right-side support surface extending outwardly in the transverse direction is provided on a right side surface of the front end portion of the top handle. It is located substantially at the same position as a left-side support surface which is comprised of a rear surface of the front end portion of the side handle in the lengthwise direction of the main body.

Abstract: A valve drive mechanism is provided for an internal combustion engine, especially a four-stroke engine in a power chain saw. The implement housing is spanned by a front handle, the tubular grip of which is adjacent to the cylinder head of the engine and extends from one longitudinal side of the implement to the other longitudinal side thereof. A rocker arm of a valve control is pivotably mounted on the cylinder head between the ends of the rocker arm, with the rocker arm being pivotable about a pivot axis disposed transverse to the rocker arm. Push rods of a control mechanism engage one end of the rocker arm to actuate a poppet valve, on the valve stem of which the other end of the rocker arm acts. To be able to guide the tubular grip close to the center of gravity of the implement, the longitudinal axis of the rocker arm is disposed approximately parallel to the adjacent portion of the tubular grip.

Abstract: The invention relates to a portable handheld work apparatus such as a motor-driven chain saw, a cutoff machine, a brushcutter or the like. The work apparatus includes an internal combustion engine (1) mounted in a housing (2) which drives a work tool via centrifugal clutch (3). The centrifugal clutch (3) includes a carrier (5) driven by the engine (1). The carrier (5) has rpm-dependent displaceable centrifugal weights (6) which are displaceable against a return force and come into contact engagement against a contact wall (7) of an output part (8) so as to transmit-torque. A rotationally-elastic damping element (11) is arranged between the output part (8) and an intermediate element (10) connected to the tool (4) so as to rotate with the intermediate element (10).

Abstract: A manually guided implement, such as a pole pruner, is provided. Disposed at one end of a supporting tube is a drive motor that via a shaft disposed in the supporting tube drives a working tool that is held at the other end of the supporting tube. The supporting tube has a section that is associated with the working tool, and a section that is associated with the drive unit. The sections of the supporting tube are fixedly interconnected via a gearbox of a miter gear, with the angle being prescribed by the gearbox and being less than or greater than 180°.

Abstract: A portable handheld work apparatus such as a motor-driven chain saw includes a housing (6) of a drive unit (2). The following are mounted in the housing (6): an internal combustion engine (3), a carburetor (4) for fuel metering and an air filter (5) as well as a fuel tank (8). The air filter (5) is mounted ahead of the carburetor in the flow direction of the fresh air flow. A largest possible filter action is obtained with a compact configuration in that a housing (10) of the air filter (5) lies at least partially in a space between the carburetor (4) and the fuel tank (8).

Abstract: In order to design a motor chain saw with a chain brake device releasable as a back kick brake and as a coasting brake comprising a tension lever (2), movable with respect to the housing of the motor chain saw, which can be moved between a brake position (B) and a ready position (b), a release lever (19) which can take up a coasting brake position (A) and a disengaging position (f), in combination with a supplementary brake device known as a coasting brake, it is proposed that the tension lever (2) is placed linearly slidingly movable with respect to the housing of the motor chain saw and that the release lever (1) is placed slidingly movable with respect to the tension lever (2), whereby both axles of the sliding movement are parallel to each other.

Abstract: The invention relates to a portable handheld work apparatus including a chain saw, a vacuum/blower apparatus or the like. The work apparatus has a handle (2) for carrying and guiding the work apparatus (1). Thumb supports (4, 5) are provided on both sides with respect to the longitudinal axis (3) of the handle (2).

Abstract: A hedge trimmer has a tool that is driven by a drive unit. At least one vibration-dampened handle is secured to the drive unit. The handle comprises a one-piece component having a grip portion and a mounting portion for mounting on the drive unit. To simplify mounting of the handle, the grip portion and the mounting portion are interconnected by a vibration-dampening intermediate portion. The mounting portion along with the intermediate portion and the grip portion form the one-piece or monolithic component.

Abstract: A chainsaw guide bar includes a bar body and a nose member removably attached to the bar body by an elastic snap-in coupling, eliminating the need for separate fastening elements. The snap-in coupling includes dimples formed in tongues of the nose member, the dimples being received in holes formed in a web of the bar body. The dimpled portions of the tongues are elastically flexible in a thickness direction of the guide bar to enable the nose member to be inserted or removed.

Abstract: The chain of an electromotive chain saw is quickly stopped by the combined use of an electric brake and a mechanical brake when a trigger member is turned off. The rear end of a brake band disposed to tighten a brake drum by operating a hand guard is secured to a bent rod. When the trigger member is released, the brake band is normally tightened around the outer periphery of a brake drum by the urging force of a coil spring. When the trigger member is released, a circuit provided with a brake winding is closed, thereby applying a dynamic braking force. When the dynamic brake force is applied, a centrifugal clutch is released quickly and the speed of stopping the brake drum is accelerated.