Abstract: A starter mechanism for an internal combustion engine for a motor-driven, manually-guided implement is provided. A clutch drum is rotatably mounted about a journal pin on a housing of the implement. The clutch drum is fixedly connected with a carrier of a ratchet for transfer of drive torque from the drum to the motor shaft. For the reversible engagement of the ratchet in a clutch member fixedly connected with the motor shaft, the ratchet has a pawl on the carrier that, with the aid of a guide element resting against a pawl pin, pivots during a starting process. On that side facing away from the carrier the pawl is spanned by an abutment element, at least in the region of its pivot axis.

Abstract: The invention is directed to a cutterhead for an overhead branch cutter. The cutterhead includes a work tool and a gear assembly housing having a lower housing part and an upper housing part defining a closure cover for the lower housing part. A gear assembly is mounted in the housing and includes an input shaft and an output shaft disposed transversely to the input shaft. A first bearing unit journals the input shaft and a second bearing unit journals the output shaft in the gear assembly housing. Intermeshing gears are mounted between the input shaft and the output shaft. The lower housing part and the upper housing part conjointly define a partition plane partitioning the first and second bearing units. A one piece attachment flange is formed on the lower housing part and the output shaft has an outer end extending through the attachment flange. The work tool is mounted on the attachment flange and is operatively connected to the outer end of the output shaft.

Abstract: A cutting machine having a rotatingly driven cutting tool (2) and a tool guard (1). The tool guard (1) has a first tool guard part (11) which is fixedly mounted with respect to the apparatus and a second tool guard part (12) which can be pivotably mounted relative to the first tool guard part (11). Each tool guard part includes side walls (30, 32) lying adjacent to respective sides of the cutting tool and a center web which connects the two side walls to each other. The center web (31) extends curved in the peripheral direction and is disposed above the cutting tool (2). In order to perform a disturbance-free pendular cut, the pivotable second tool guard part (12) carries a slide piece (40) which projects beyond the end edge (34) of the center web (31) and has a rounded outer slide surface (35) facing away from the center web (31). The end edge (34) faces away from the fixed first tool guard part (11).

Abstract: A two-stroke engine for driving a crankshaft includes a cylinder defining a longitudinal elevation axis and having a top wall and a cylindrical side wall terminating in the top wall. A piston is mounted in the cylinder so as to be movable along the side wall for driving a crankshaft. The cylinder and the piston conjointly define a combustion chamber wherein combustion gases are generated during operation of the engine and the side wall of the cylinder has an exhaust window which opens into the combustion chamber for conducting away the combustion gases. The exhaust window defines a longitudinal center axis passing approximately through the elevation axis and the side wall of the cylinder has a surface portion lying opposite the exhaust window. A plurality of main channels and a plurality of support channels open into the combustion chamber for conducting fuel mixture into the combustion chamber.

Abstract: The invention is directed to a bearing arrangement for a drive shaft connecting a work tool to a drive unit. A protective tube has an inner wall surface and is part of this bearing arrangement. A bearing structure is mounted in the protective tube and has a bearing sleeve for accommodating the drive shaft therein. A plurality of longitudinally running supporting ribs extend from the bearing sleeve to act on the inner wall surface to hold the bearing sleeve approximately centered in the protective tube. Each of the supporting ribs includes a radial leg extending approximately radially from the bearing sleeve and a peripheral leg extending axially of the radial leg and approximately in the peripheral direction of the inner wall surface. The radial leg has an outer radial end portion facing toward the inner wall surface so as to leave a gap therebetween. The peripheral leg extends from the radial leg at the outer radial end portion and is supported on the inner wall surface.

Abstract: A hand-guided working tool has a telescopic rod with a first and a second end and a drive motor connected to the first end. A working tool is connected to the second end of the telescopic rod. A telescopic drive shaft is enclosed in the telescopic rod. A first end of the telescopic drive shaft is connected to the drive motor and a second end of the telescopic drive shaft is connected to the working tool. The telescopic rod has an outer tube and an inner tube inserted with a leading end into the outer tube. The inner tube displaceable in the longitudinal direction of the telescopic rod. The telescopic drive shaft has a shaft tube and a shaft rod enclosed in the shaft tube. At least two bearings are arranged in the outer tube for rotatably supporting the telescopic drive shaft. They are spaced from one another in the longitudinal direction of the telescopic rod.

Abstract: A hand-held working tool has a motor housing and a motor with output shaft positioned in the motor housing. A clutch housing is connected to the motor housing. A centrifugal clutch is positioned in the clutch housing. A drive shaft with a first and a second end is provided. The centrifugal clutch detachably connects the output shaft to the first end of the drive shaft. The centrifugal clutch has fly weights connected to the output shaft and a clutch drum connected to the first end of the drive shaft. This clutch drum surrounds the output shaft and the fly weights. A cutting element is connected to the second end of the drive shaft. A protective tube having a proximal end connected to the clutch housing and a distal end connected to the cutting element is provided. The drive shaft is enclosed in the protective tube. A bearing element is positioned at the first end of the drive shaft. Radial play is provided between the bearing element and the first end of the drive shaft.

Abstract: The invention is directed to a cutter blade support for a pair of knives of a hedge trimmer. The cutter blade support includes first and second bars conjointly defining a space therebetween. First and second cutter blades are arranged in the space and define respective sets of apertures formed therein. The first bar has openings formed therein and a plurality of threaded bolts are held in the second bar. The threaded bolts extend through the respective sets of apertures and have respective end portions extending through the openings in the first bar. Attachment nuts are disposed on the first bar and threadably engage corresponding ones of the end portions. The threaded bolts are pressed into the second bar so as to be tightly held therein and so as to be nonrotatable with respect thereto.

Abstract: A hand-held working tool has a housing and an air cooled internal combustion engine with cooling ribs positioned in the housing. A sealed carburetor box is connected to the internal combustion engine. A blower is positioned in the housing for supplying cooling air to the combustion engine. The blower sucks in cooling air in the axial direction of the blower and conveys it tangentially in the direction of rotation of the blower to the cooling ribs. The housing has a blower cover. A combustion air channel is positioned on a pressure side of the blower and connected to the blower cover and the carburetor box, and the internal combustion engine sucks in combustion air through the carburetor box. The channel has an inlet for branching off combustion air from the cooling air flow that is conveyed to the combustion engine. The inlet is in the form of at least one slot within the blower cover. The inlet has at least one deflecting element with a deflecting front surface for guiding the cooling air and a back side.

Abstract: A hand-guided, portable tool includes a housing and an internal combustion engine mounted in the housing. A fuel tank is mounted in the housing. The internal combustion engine has a carburetor with induction port for preparing a fuel/air mixture. An air filter is mounted in the housing. The air filter has a clean air side that is connected to the induction port. The internal combustion engine also has a control chamber with inlet valve. The control chamber is filled with fuel supplied thereto via the inlet valve from the fuel tank. The control chamber supplies fuel to the carburetor. The internal combustion engine has a compensation chamber delimited on one side by a control diaphragm that controls the inlet valve. The compensation line connects the compensation chamber to the clean air side of the air filter. The compensation line has a first connection section connected to the clean air side of the air filter and a second connection section connected to the compensation chamber.

Abstract: A trimmer has a drive motor, a cutting tool, and a drive shaft connecting the drive motor and the cutting tool. A protective tube encloses the drive shaft. A connector is provided for connecting a handle bar, having a first and a second section, to the protective tube. The first and second sections are parallel to one another, and the first section is connected to the protective tube. The first section has a free end with a first handle and the second section has a free end with a second handle. The handle bar is positioned asymmetrically relative to the longitudinal axis of the protective tube. The handle bar has a bent portion, with a first and a second bend, connecting the first and second sections. The bent portion is positioned adjacent to the connector. In the operating position of the trimmer, the longitudinal axis of the second section is displaced relative to the longitudinal axis of the first section along the longitudinal axis of the protective tube.

Abstract: A clamping device for axially clamping a disk-shaped tool member on a shaft of a working tool has a pressure member for force-lockingly clamping the tool member between a radial surface of the shaft and the pressure member. A ring mount for force-loading the clamping member is provided for clamping and releasing the tool. An engaging device acting between the shaft and the pressure member is provided for positive-lockingly engaging the shaft upon actuation of the ring mount in a clamping direction of the clamping device.

Abstract: A valve for venting a container has a valve housing with an annular chamber. A ring member with a first axial and a second axial end is arranged in the annular chamber. The ring member has a first sealing lip at the first axial end and a second sealing lip at the second axial end. A first channel and a second channel extend axially along the ring member for venting the container. The first channel vents in a first direction and the second channel vents in a second direction opposite the first direction. The first sealing lip closes off the first channel such that the first sealing lip and the first channel function as a relief valve. The second sealing lip closes off the second channel such that the second sealing lip and the second channel function as a relief valve.

Abstract: The invention is directed to a pressure compensating valve for a fuel tank of a work apparatus such as a portable handheld work apparatus equipped with an internal combustion engine. The fuel tank has a tank wall and the pressure compensating valve includes a housing cap defining an inner space and is impermeable to air. A pressure compensating stub is provided on the tank wall and terminates within the housing cap. Pressure compensating apertures are formed in the tank wall to open into the stub and a valve is provided for controlling the apertures for venting and ventilating the fuel tank. A passage connects the inner space of the cap with the atmosphere. A finely porous filter element is fixedly held in the stub and the apertures open into the filter element. The housing cap is mounted on the filter element and is held on the filter element.

Abstract: The invention is directed to a muffler for insertion into a pipe such as the intake pipe of an internal combustion engine. The muffler includes a base body defining a longitudinal axis and having first and second axial end faces. The base body has a plurality of pass-through openings formed therein which extend between the first and second end faces of the base body in the direction of the longitudinal axis. The base body is delimited by a radially outer-lying surface and has a support section in the region of the outer-lying surface. The support section extends axially beyond the first end face and is the maximum projection extending beyond the first end face of the base body.

Abstract: A suction air filter for an internal combustion engine with a diaphragm carburetor, wherein the combustion engine has a suction channel for taking in combustion air from a clean air side of the air filter and for taking in fuel from a fuel chamber, wherein the diaphragm of the diaphragm carburetor controls the intake of the fuel into the fuel chamber, and wherein the dry side of the diaphragm is loaded with the pressure of the clean side of the suction air filter, has a housing and a filter body including a block of foamed plastic material and a blocking layer connected to one side of the block. The filter body is positioned in the housing such that the blocking layer is located at the clean side of the suction air filter.

Abstract: A securing mechanism for securing a drive shaft of a rotating tool member of a working tool against rotation includes a securing member fixedly connected to the drive shaft. The securing member has at least one engagement opening. A lock bolt for engaging the at least one engagement opening is provided. The lock bolt is axially displaceably positioned in the housing of the working tool. A spring for biasing the lock bolt into engagement with the at least one engagement opening is provided. An actuating element for displacing the lock bolt from an engaged position, in which the lock bolt engages the at least one engagement opening, into a disengaged position, in which the lock bolt is removed from the engagement opening, is provided. The actuator element is positioned adjacent to the lock bolt and has a cam member extending into the travel path of the lock bolt.

Abstract: The invention relates to an antivibration device between a motor unit 2 and a handle unit 9 of a portable handheld motor-driven chain saw 1. The antivibration device includes a sleeve-shaped elastic base body 6 having one of its ends 36 in a receptacle 20 of the motor unit 2 and the other end 46 in a receptacle 90 of the handle unit 9. The ends (36, 46) of the base body are fixed in the receptacles (20, 90) by axially engaging plugs (31, 41) in the end sections (30, 40). The guiding characteristics of the motor-driven chain saw are not affected by base bodies which become damaged or soft. This is so because at least one of the stops 31 has a coupling member 50 which bridges an axial spacing (z) between the plugs (31, 41) and projects into the other plug 41 and is latched so that it cannot be axially separated therefrom. A mechanical connection remains between the handle unit and the motor unit when the base body tears off.

Abstract: A hand-held working tool has a tool member and a drive unit with an internal combustion engine drivingly connected to the tool member. A grip unit with vibration damping members is connected with the vibration damping members to the drive unit. Receiving cages for receiving the vibration damping members are connected either to the drive unit or the grip unit. Pins with a longitudinal axis are connected to the other one of the drive unit or the grip unit. They extend in the direction of the longitudinal axis at least partly into the receiving cages so as to be positioned substantially centrally in the vibration damping members. The vibration damping members have a greater extension in the direction of a first axis, extending substantially perpendicular to the longitudinal axis, than in a direction of a second axis, extending also substantially perpendicular to the longitudinal axis.