Abstract: In order to provide a handheld work machine that does not require expensive start circuitry for the critical start-up phase of the combustion engine, and in which nevertheless the required constant supply voltage for the engine is present in order to achieve optimum starting behavior, a handheld work machine is provided with at least one combustion engine which in operation requires a supply voltage, and with a voltage generator that supplies a generator voltage that depends on the rotary speed of the combustion engine, which generator voltage is used to generate the supply voltage, wherein the handheld work machine is electrically connected to an additional voltage source that prior to starting the combustion engine provides the required supply voltage that at this point in time is not yet present.

Abstract: According to a chain saw braking system, engagement between a front end portion of a belt and a main body by an engagement member is released at the time of application of an impact. When a front end portion is pulled by the spring force of a compression coil spring, an elongate hole for protrusion is engaged with a protrusion to restrict a rear end portion from being moved in the same direction as the front end portion. Thus, it is possible to strongly tighten a drum by the belt to thereby reliably stop the movement of a chain. With this arrangement, the chain can be prevented from being damaged when a chain saw is accidentally dropped onto the ground due to an impact applied thereto.

Abstract: An arrangement for the capture of a broken sawchain (16) of a chainsaw (10) comprising a stationary shield (32) that covers a rear section of the saw. The shield (32) has an end surface (42) that extends between an outer surface and an inner surface of the shield (32) and has such hardness and is designed with a convex curvature of such a radius that one part of the broken sawchain (16) that comes to an external location during operation of the saw (10) can slide around the end surface (42) in an essentially unhindered manner in a direction towards the inner surface.

Abstract: A system effectuates increased cutting device safety through rapid detection of abrupt motion of the device, and/or the proximity of the device cutting elements in relation to its operator. An signal processor receives, generates and processes signals from multidimensional relative distances measurement module(s) and adjusts an electro-mechanical interface with the cutting device drive and/or power mechanism as well as actuators to counteract dangerous movements of the chainsaw. Distance measurement modules resident on the user may be spatially dispersed to protect multiple areas of potential interaction between device and operator. The signal processor receives and processes the sensor signals, determines motion and proximity measurements, compares the measurements to predetermined and set thresholds, and effectuates device interruption should thresholds be reached.

Abstract: Method for adjusting the air-fuel ratio of an internal combustion engine, in a fuel supply section thereof, such as a carburettor or a fuel-injection system, the fuel supply section having a control unit for adjusting the air-fuel ratio of the engine and the engine having an engine speed and an engine throttle ranging from zero throttle to full throttle. The method including: a) measuring the engine speed of the engine; b) comparing the engine speed to a first engine speed value; c) adjusting the air fuel ratio if the engine speed is lower than the first engine speed value; and d) repeating a) to c) until the engine speed is either greater than or equal to the first engine speed value.

Abstract: A hand-guided power tool has a drive motor and a drive element connected to and driven by the drive motor. A working tool is connected to the drive element and driven by the drive element. A braking device is correlated with the drive element, wherein the braking device in a first state, in which the braking device is applied, blocks the drive element and in a second state, in which the braking device is released, releases the drive element so that the drive elements can rotate freely. The braking device has a brake lever and a sensor that detects the first and second states of the braking device. A control unit is provided, wherein an output signal of the sensor as a state signal of the first state or the second state is supplied to the control unit. The control unit, based on the state signal, controls devices of the power tool.

Abstract: The invention relates to an auto tensioner of a chain saw. A spiral guide groove (16) of the disk (15) engages with a protrusion 10a of a slider piece (10) and the slider piece (10) is slidably stored in a guide portion (9) formed in a chain cover (2) via a spring (14). A tensioner (11) comprising a protrusion (11) engaged with a guide bar is slidably stored in the slider piece 10 via a coin spring (12). The protrusion (10a) contacts an outer circumference face of the spiral guide groove on a diameter passing through a rotating center of the disk, and an unshown nut for engaging with a stud bolt 6 provided on an engine cover side is attached on the rotating center of the disk (15). A rotation of the disk enables to fix the chain cover (2) and move the guide bar.

Abstract: A latch mechanism for a power tool, such as a hedge trimmer, having a housing accommodating a motor and a handle assembly adapted to pivot relative to the housing in a plurality of positions. The latch mechanism includes a lever carrying a first and second retaining member that moves into and out of engagement with the handle assembly for locking and unlocking the handle assembly relative to the housing. The retaining members are biased towards their engaging conditions by a spring. An interlock member on lever cooperates with an arm member to prevent disengagement of the first and second retaining members from the handle assembly when the motor is actuated, and for preventing actuation of the motor when the first or second retaining member is in a retracted condition.

Abstract: A power tool movement monitor system including a first accelerometer operatively configured to sense movement along a first axis of a power tool and a first high pass filter operatively connected to the output of the first accelerometer. The first high pass filter has an output and a cutoff frequency corresponding to a predetermined acceleration limit capable of being output by the first accelerometer. The power tool movement system further includes a logic circuit operatively configured to generate a warning signal when the first high pass filter outputs a signal having a frequency equaling or exceeding the cutoff frequency of the first high pass filter.

Abstract: A braking device is provided for braking or immobilising a shaft in a work tool, particularly a saw chain, hedge shears or the like. The braking device has a brake band that at surrounds at least part of an area of the shaft, in which the brake band forms an effective plane, and two brake band holders with which the brake band may be placed under tension and released, in which at least one brake band holder is constructed movably, and in which a movable brake band holder is arranged with little space requirement in the braking device. At least one brake band holder is mounted outside the effective plane of the brake band so that it is rotatable about the axis of rotation or about an approximately parallel axis or shaft and/or so that it is able to be moved in a linear direction on a plane that is approximately orthogonal with the shaft.

Abstract: A woodworking machine is disclosed. The machine includes a cutting tool and a motor adapted to drive the cutting tool. The machine further includes a detection system to detect a dangerous condition between the cutting tool and a person, such as a person coming into contact with the cutting tool. A reaction system is provided to disable the cutting tool, such as by covering, blocking, destroying, wrapping, etc., upon detection by the detection system of the dangerous condition.

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 gasing and braking elements with the throttle trigger.

Abstract: A sprocket cover arrangement for a hand-held chain saw has a housing and a sprocket cover that has an opening and is connected to the housing. At least one stud bolt having a first end secured to the housing and having a second end that is a free threaded end is provided. The free threaded end projects through the opening of the sprocket cover to an exterior side of the sprocket cover when the sprocket cover is positioned in an operating position on the housing. A nut is screwed onto the free threaded end of the at least one stud bolt on the exterior side of the sprocket cover so as to secure the sprocket cover on the housing. The nut is secured captively, rotatably and with play in the opening of the sprocket cover.

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 power working machine has a machine body, a drive source mounted on the machine body for driving a work implement connected to the machine body, and an operating handle mounted on the machine body for undergoing rotation relative to the machine body. A throttle lever is mounted on the operating handle for undergoing pivotal movement to adjust an output of the drive source. A lock mechanism is mounted on the operating handle for locking the operating handle at a preselected rotational angular position relative to the machine body. A lock cancellation lever is mounted on the operating handle for unlocking the lock mechanism to thereby permit rotational movement of the operating handle relative to the machine body. A stopper section is mounted on the operating handle for permitting operation of the lock mechanism while preventing pivotal movement of the throttle lever and for preventing operation of the lock mechanism while permitting pivotal movement of the throttle lever.

Abstract: A chainsaw kickback protection device includes a chain guard and a mounting bracket assembly. The chain guard includes an elongated guard body and a chain-engaging member. The elongated guard body has a channel extending along at least a portion of its length. The chain-engaging member is disposed within the channel extending at least partially along a length of the channel. The mounting bracket assembly includes a mounting bracket and a connection structure. The connection structure is resiliently and pivotably connected between the mounting bracket and the elongated guard body. The connection structure biases the elongated guard body to a non-displaced orientation with respect to the mounting bracket. The connection structure enables the entire elongated guard body to move from the non-displaced orientation to a displaced orientation with respect to the mounting bracket.

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 power working machine has a machine body, trimming blades attached to the machine body and drivable by a drive source, an operating handle rotatably mounted on the machine body, a throttle lever disposed on the operating handle, and a throttle lock lever disposed on the operating handle for disabling pivotal movement of the throttle lever. The operating handle has a lock mechanism for locking the operating handle at a rotational position relative to the machine body, and an operation lever for unlocking the lock mechanism to thereby permit rotational movement of the operating handle and, simultaneously with the unlocking of the lock mechanism, for placing the throttle lock lever in a locking position to disable pivotal movement of the throttle lever. The throttle lock lever has a lock portion for permitting pivotal movement of the throttle lever while simultaneously locking the operation lever of the operating handle.

Abstract: The present disclosure concerns embodiments of an improved chainsaw guard. The saw guard includes a pivotable guard arm that may include downwardly extending saw chain guarding walls. In particular embodiments, the guard arm is pivotally connected to a mounting bracket, which is adapted to accommodate mounting the guard to the bar studs of various chainsaws having different bar stud spacing. The mounting bracket may be swept back to facilitate mounting to a wide variety of chainsaw models. The guard arm may include a handle adjacent the chainsaw housing to permit the guard arm to be lifted away from the guide bar so as to provide access to the upper run of the saw chain such as to perform maintenance or to permit positioning of the saw chain against a work piece in an undercutting operation.

Abstract: A portable motor chain saw comprises a machine body (1) which a driving unit, a rear handle (2), a front handle which extends over the machine body, a guide bar (6), and a dog device (15) provided such that it can be pressed against the object to be worked by means of the machine, said dog device forming a center of rotation for turning the guide bar in the plane of the guide bar. The characterising features are that the dog member (15) is provided in front of the front handle (3), approximately on a level with that part (4) of the front handle which extends over the machine body, and is connected to the front handle, and that at least that part of the dog device which is provided to engage the object to be worked, consists of a polymeric material. Preferably, the height of the dog device over the guide bar corresponds to two to three times the vertical width of the guide bar.

Abstract: A machine for cutting plate-shaped workpieces, incorporates a tool guide (7), an operating handle (13), and a cutting tool (6) which revolves along the tool guide (7). By moving the operating handle (13), the tool guide (7) with its cutting tool (6) can be shifted from an idle position into an active position. In its idle position the cutting tool (6) is disengaged from, and, in its active position it is engaged in, the workpiece to be processed. Provided between the operating handle (13) and the tool guide (7) is a variable ratio transmission mechanism (14, 18) with a transmission ratio which varies with the movement of the operating handle (13) as a function of the position of the tool guide (7) and its cutting tool (6) relative to the workpiece.

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: The present disclosure concerns embodiments of an improved chainsaw guard. The saw guard includes a pivotable guard arm that may include downwardly extending saw chain guarding walls. In particular embodiments, the guard arm is pivotally connected to a mounting bracket, which is adapted to accommodate mounting the guard to the bar studs of various chainsaws having different bar stud spacing. The mounting bracket may be swept back to facilitate mounting to a wide variety of chainsaw models. The guard arm may include a handle adjacent the chainsaw housing to permit the guard arm to be lifted away from the guide bar so as to provide access to the upper run of the saw chain such as to perform maintenance or to permit positioning of the saw chain against a work piece in an undercutting operation.

Abstract: A system effectuates increased cutting device safety through rapid detection of abrupt motion of the device, and/or the proximity of the device cutting elements in relation to its operator. An adaptive signal processor receives signals from accelerometers (i.e. motion sensors) and/or proximity sensors, and adjusts an electro-mechanical interface with the cutting device drive and/or power mechanism. Sensors resident on the user may be spatially dispersed to protect multiple areas of potential interaction between device and operator. The adaptive signal processor receives and processes the sensor signals, determines motion and proximity measurements, compares the measurements to predetermined and set thresholds, and effectuates device interruption should thresholds be reached. The signal processor contains an adaptive signal processing algorithm which accounts for noise and invalid sensor measurements such as those made due to some external object physically disrupting proximity sensor-pair measurements.

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: 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 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: 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 invention relates to a guide bar for a motor-driven chain saw comprising an elongated planar base body which has a guide groove (8) in its outer periphery for guiding a saw chain (6). The saw chain (6) includes cutting links (14), lateral connecting links (12) and center drive links (10). The links are pivotally connected to each other with rivets (18). The drive links (10) engage with rakers (11) in the guide groove (8); whereas, the connecting links (12) are supported on guide surfaces (9) provided laterally of the guide groove (8). The guide bar (3) is fixed to the housing (2) of the motor-driven chain saw (1) at its attachment end (4) and the free tip (22) of the guide bar (3) has a direction-changing section (21) for the saw chain (6). In the region of the direction-changing section (21), guide plates (23, 43) are attached to the guide bar (3).

Abstract: A hedge cutting system for cutting branches and other foliage with a chainsaw. The hedge cutting system includes at least one elongated cutting bar for guiding movement of branches of a hedge toward a cutting member while cutting the hedge. The cutting bar is removably mountable on a guide bar of a chainsaw. At least one spacing member is provided for spacing the cutting bar from the guide bar. The spacing member is removably positionable between the cutting bar and the guide bar. A plurality of fastening members is provided for removably fastening the cutting bar and the spacing member together. An end of each of the fastening members is removably extendable through the guide bar such that the cutting bar and the spacing member are removably mountable on the guide bar.

Abstract: A front cover, covering an outer surface of a saber saw housing, is made of an electrically and thermally insulating rigid material. A resilient member is provided on an outer surface of the front cover partly so as to form a front-end grip to be held by a user. The friction coefficient of the resilient member is larger than that of the front cover.

Abstract: Cutting machines with high-speed safety systems, and actuators used in high-speed safety systems, are disclosed. The cutting machines may include a detection system adapted to detect a dangerous condition between a cutting tool and a person. A reaction system performs a specified action, such as stopping the cutting tool, upon detection of the dangerous condition. An actuator may be used to trigger the reaction system to perform the specified action.

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 guide bar for a motor-driven chain saw comprising an elongated planar base body which has a guide groove (8) in its outer periphery for guiding a saw chain (6). The saw chain (6) includes cutting links (14), lateral connecting links (12) and center drive links (10). The links are pivotally connected to each other with rivets (18). The drive links (10) engage with rakers (11) in the guide groove (8); whereas, the connecting links (12) are supported on guide surfaces (9) provided laterally of the guide groove (8). The guide bar (3) is fixed to the housing (2) of the motor-driven chain saw (1) at its attachment end (4) and the free tip (22) of the guide bar (3) has a direction-changing section (21) for the saw chain (6). In the region of the direction-changing section (21), guide plates (23, 43) are attached to the guide bar (3).

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: An easily engageable and releasable chainsaw bar guard for protecting an individual carrying a chainsaw and for preventing damage to the cutter chain and saw dogs of a chainsaw. The bar guard comprises an elongated stiff hollow sleeve whose interior space is just slightly larger than the bar and chain to be protected. The sleeve has an opening at the proximal end for sliding the sleeve onto the guide bar, and is closed at the other end to protect the end of the bar and cutter chain. A snap-clip mechanism is fixed to the sleeve for releasably latching the proximal end of the guard to the chainsaw. The snap-clip mechanism biases a retaining claw into contact with the chainsaw bar between the nuts on the saw bar attachment/adjustment bolts. The sleeve and the snap-clip mechanism can be selectively configured to accommodate chainsaw bars of different shapes and dimensions and the spacing of whose guide bar adjustment nuts varies.

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: To limit the penetration of the outer end of a chain saw into a material being cut by the saw, the chain carrying rail of the saw has a number of uniformly sized holes located at different points along its length into any selected one of which holes a limiting means can be placed, with the limiting means including two rotatable wheels located on opposite sides of the rail.

Abstract: An easily engageable and releasable chainsaw bar guard for protecting an individual carrying a chainsaw and for preventing damage to the cutter chain and saw dogs of a chainsaw. The bar guard comprises an elongated stiff hollow sleeve whose interior space is just slightly larger than the bar and chain to be protected. The sleeve has an opening at the proximal end for sliding the sleeve onto the guide bar, and is closed at the other end to protect the end of the bar and cutter chain. A snap-clip mechanism is fixed to the sleeve for releasably latching the proximal end of the guard to the chainsaw. The snap-clip mechanism biases a retaining claw into contact with the chainsaw bar between the nuts on the saw bar attachment/adjustment bolts. The sleeve and the snap-clip mechanism can be selectively configured to accommodate chainsaw bars of different shapes and dimensions and the spacing of whose guide bar adjustment nuts varies.

Abstract: A chain saw is provided that comprises a motor which rotatingly drives a cutting chain via a sprocket mounted on a spindle (34) via a clutch mechanism. When the clutch mechanism (17) is engaged, a pivotal handle guard (22) interacts with the clutch mechanism to disengage the clutch mechanism (17). The clutch mechanism is biased towards disengagement. An actuating means (8, 68) is provided such as a switch which is releasably connected via a pin located within a groove to the clutch mechanism (17). The actuating means can override the biasing force to engage the clutch (17) when the actuating means (8, 68) is connected to the clutch (17). The pivotal handle guard (22) is configured so that it interacts with the pin wherein, when the pivotal handle guard (22) is activated, it detaches the actuating means (8, 68) from the clutch mechanism (17) by knocking the pin out of the groove.

Abstract: A hedge clipper is provided that has an internal combustion engine that is to be started by hand. By means of a clutch and a gear mechanism, the engine drives cutting blades in a reciprocating manner; the cutting blades are guided and held in a cutter bar. Disposed on the output side of the clutch is a brake drum around which extends a brake band. The first end of the brake band is fixed to the housing, and the second end of the brake band is held on a pivotable brake lever that is acted upon by a brake spring that urges the brake band into engagement against the brake drum. The brake lever can be moved into an inoperative position of the band brake by a release lever against the force of the brake spring. The release lever cooperates with an adjusting cam that is disposed directly adjacent to the brake lever and in the inoperative position of the band brake forms a rest stop for the brake lever, receiving the force of the brake spring.

Abstract: A flip top housing apparatus for side saw and topping saws used with a tree processing apparatus. The apparatus comprises a bottom section which attaches to one side of a plurality of hinges and a top section which pivotally attaches to the opposite sides of the hinges such that the top section is selectively moveable between a processing position atop the bottom section, shielding the saw blade from the surrounding environment during tree processing, and the transport position adjacent the bottom section, for allowing the housing to avoid low clearances during the transporting of the tree processing device. A lock comprising a handle portion, which fixedly attaches to the top section, and a receiving portion, which fixedly attaches to the bottom section, allows one to fasten the top and bottom section together during the processing position.

Abstract: A portable, hand-guided working tool has a drive motor and a motor housing in which the drive motor is housed. The motor housing has a front side and a rear side when viewed in the direction of the longitudinal center axis of the working tool. A tool member is connected to the front side of the motor housing and extends forwardly in the direction of the longitudinal center axis. The tool member is driven by the drive motor. The rear grip is connected by vibration damping elements to the rear side of the motor housing and extends rearwardly in the direction of the longitudinal center axis. An abutment device includes a first abutment member connected to the motor housing and positioned between the rear end and the rear grip and includes a second abutment member connected to the rear grip and cooperating with the first abutment member for limiting a relative movement between the motor housing and the rear grip.

Abstract: The invention is directed to a portable handheld work apparatus having a motor driven work tool. The work apparatus includes a housing, a handle mounted on the housing for holding and guiding the work apparatus and a safety member having an attachment portion and a lug portion for receiving and accommodating a safety rope therethrough to facilitate holding the work apparatus. The attachment portion and the lug portion conjointly define a single piece. The attachment portion is held on the housing so as to permit the lug portion to move between a rest position wherein the lug portion is at least partially in contact engagement with the housing and an in-use position wherein the lug portion is displaced away from the housing.

Abstract: A hand lever device includes a housing (15A, 15B) and a main lever (30) pivotally attached to the housing (15A, 15B). The main lever (30) is connected to one end (22a) of an inner cable (22) extending through an outer tube (21) of a Bowden cable (20) for controlling a driven member (CV). The outer tube (21) is provided with a shifting mechanism (40), such as a threaded member shifting mechanism (41, 45), for forcibly shifting one end (21a) of the outer tube (21) along the longitudinal direction of the inner cable (22).

Abstract: A chain saw brake device that can instantly halt the rotation of a cutting chain when a motor drive switch is turned off. The chain saw brake device includes a brake band wound around a brake drum, such that by operating a hand guard and pulling the forward end of the brake band, the brake band is tightened around the brake drum, thereby stopping the cutting chain. The rear end of the brake band is fixed to a bent rod, and the bent rod is urged rearwardly by a coil spring when the drive switch is turned off, causing the brake band to tighten around the brake drum. By activating a trigger lever, the movable member, engaged with the trigger lever, is moved forwards, thereby pushing forwards the bent rod, and loosening the brake band.

Abstract: The invention is a cutter bar for a chain saw which permits quick and convenient trimming of hedges and shrubbery. The cutter bar is of conventional design, being relatively thin and elongated, and supporting a cutting chain which extends around its periphery. Additionally, the cutter bar of this invention has a plurality of spaced-apart tines which extend transversely out from the top and/or bottom of the cutter blade. The tines are fastened to or extend from a side or edge of the cutter blade, optionally by rivets passing through a shim or spacer--the tines are not connected to each other by a web or common casting other than the cutter blade. This way, the web or common casting does not add to the size, bulk, or weight of the cutter blade, allowing it to remain less burdensome and less interfering during cutting. In a preferred embodiment, the spacing on the cutter bar between tines varies so that branches or limbs of varying diameter may be accommodated by the cutter blade while cutting.

Abstract: A chain saw having a guard member supported above the chain of the saw. The guard is supported by support members at the first and second ends of the chain guide. At the first end of the chain guide the blade is swingably supported and is swingable through a range from a position parallel to the chain guide to a position normal to the chain guide. At the second end of the chain guide the guard bar is releasably supported to hold the guard bar in a guard position parallel to the chain guide and to release the guard bar to swing out of the way when a work piece is being cut.

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.