Abstract: A blower wheel is provided with a base member having an axis of rotation and with a rotor of a generator, wherein the rotor is fixedly secured on the blower wheel. At least one magnet is arranged on the rotor. An inertia ring is fixedly secured on the base member at a spacing to the at least one magnet. The inertia ring is made of a first material having a first density and the base member is made of a second material having a second density. The first density is greater than the second density. An internal combustion engine is provided with such a blower wheel.

Abstract: A handheld work apparatus has a blower wheel. The blower wheel is held via a nut on the shaft in a manner locked against rotation by frictional force. A thread moment of friction is transmittable between the nut and the shaft via a thread section. A first moment of friction is transmittable between the nut and the blower wheel via a first friction contact surface. The first friction contact surface is configured such that, at a minimum tightening torque of the nut, the first moment of friction is greater than the thread moment of friction. As a result, during the operation of the work apparatus when there is a relative movement between the blower wheel and the shaft, the blower wheel moves the nut along therewith. The nut retensions the blower wheel against the shaft. The second friction contact surface runs conically with respect to the rotational axis.

Abstract: A telescopic drive shaft in a protective tube of a handheld work apparatus has one end connected to a rotational drive and the other end thereof to a driven tool. The drive shaft includes a rigid shaft segment and a connecting section. The rigid shaft segment has a hollow shaft end portion and an engagement length (E) of the connecting section engages therein. The engagement length (E) and the length of the hollow shaft end portion mutually overlap to form a joining section. The hollow shaft end portion is deformed for connecting the connecting section to the rigid shaft segment. The material of the hollow shaft end portion is compressed over its entire periphery and deformed so that the material of the hollow shaft end portion is radially displaced and is pressed in a rotative manner onto the engagement length (E) to produce a balanced, loadable connection.

Abstract: A handheld work apparatus has a blower wheel. The blower wheel is held via a nut on the shaft in a manner locked against rotation by frictional force. A thread moment of friction is transmittable between the nut and the shaft via a thread section. A first moment of friction is transmittable between the nut and the blower wheel via a first friction contact surface. The first friction contact surface is configured such that, at a minimum tightening torque of the nut, the first moment of friction is greater than the thread moment of friction. As a result, during the operation of the work apparatus when there is a relative movement between the blower wheel and the shaft, the blower wheel moves the nut along therewith. The nut retensions the blower wheel against the shaft. The second friction contact surface runs conically with respect to the rotational axis.

Abstract: A telescopic drive shaft in a protective tube of a handheld work apparatus has one end connected to a rotational drive and the other end thereof to a driven tool. The drive shaft includes a rigid shaft segment and a connecting section. The rigid shaft segment has a hollow shaft end portion and an engagement length (E) of the connecting section engages therein. The engagement length (E) and the length of the hollow shaft end portion mutually overlap to form a joining section. The hollow shaft end portion is deformed for connecting the connecting section to the rigid shaft segment. The material of the hollow shaft end portion is compressed over its entire periphery and deformed so that the material of the hollow shaft end portion is radially displaced and is pressed in a rotative manner onto the engagement length (E) to produce a balanced, loadable connection.

Abstract: A hand-guided power tool is provided with an internal combustion engine that has a cylinder and a piston disposed in the cylinder and delimiting together with the cylinder a combustion chamber. A connecting rod connects the piston and the crankshaft. The piston in operation of the internal combustion engine rotatably drives the crankshaft. An electronic control unit and an ignition device with a spark plug are provided. A support is fixedly connected to the crankshaft and a signal transducer is fixedly connected to the support. The ignition device, utilizing a signal generated by the at least one signal transducer, fires the spark plug at a timing which is predetermined by the electronic control unit. The support has a polygonal conical receptacle and the crankshaft has a corresponding polygonal conical section arranged in the polygonal conical receptacle to fixedly connect the support and the crankshaft to each other.

Abstract: A blower wheel is provided with a base member having an axis of rotation and with a rotor of a generator, wherein the rotor is fixedly secured on the blower wheel. At least one magnet is arranged on the rotor. An inertia ring is fixedly secured on the base member at a spacing to the at least one magnet. The inertia ring is made of a first material having a first density and the base member is made of a second material having a second density. The first density is greater than the second density. An internal combustion engine is provided with such a blower wheel.

Abstract: A chain saw includes a guide bar for a saw chain, a housing, a sprocket wheel cover, and a stud fixed on the housing for threadably fastening the sprocket wheel cover and the guide bar. The free thread end of the stud has a maximum usable screw-in depth (tmax) for a nut. A stop for the sprocket wheel cover having a stop surface as well as a support surface for contact engaging the stop surface are provided. In the mounted state of the guide bar, a distance (a) remains between the stop surface and the support surface. The support surface contact engages the stop surface when the guide bar is removed and the nut is tightened and screwed onto the studs to a stop screw-in depth. The stop is configured in such a manner that the maximum usable screw-in depth (tmax) is greater than the stop screw-in depth.

Abstract: A manually guided implement having an engine housing and a handle housing that are interconnected by anti-vibration elements. The handle housing is provided with a longitudinal support having, relative to a conventional operating position of the implement, a front end face that is disposed transverse to a longitudinal axis of the longitudinal support. A securement end of a front tubular handle rests against and is secured to the front end face of the longitudinal support.

Abstract: A chain saw includes a guide bar (1) for a saw chain, a housing (3), a sprocket wheel cover (4), and at least one stud (5) fixed on the housing (3) for threadably fastening the sprocket wheel cover (4) and the guide bar (1). The free thread end (7) of the stud (5) has a maximum usable screw-in depth (tmax) for a nut (6) to be screwed thereon. A stop (9) for the sprocket wheel cover (4) having a stop surface (10) as well as a support surface (11) for contact engaging the stop surface (10) are provided. In the mounted state of the guide bar (1), a distance (a) remains between the stop surface (10) and the support surface (11). The support surface (11) contact engages the stop surface (10) of the stop (9) when the guide bar (1) is removed and the nut (6) is tightened and the nut (6) is screwed onto the studs (5) with a stop screw-in depth. The stop (9) is configured in such a manner that the maximum usable screw-in depth (tmax) is greater than the stop screw-in depth.

Abstract: A portable handheld work apparatus has an internal combustion engine (5) having a cylinder (8) and a crankcase (13). The cylinder (8) has an opening (19) for exhaust gases whereat an exhaust-gas muffler (14) is mounted. The exhaust-gas muffler (14) is mounted on the cylinder (8) at least at one attachment location (40, 41) and at least a further attachment location (42) on the internal combustion engine (5). A reduced weight of the work apparatus and a low mechanical load of the exhaust-gas muffler (14) can be achieved when the exhaust-gas muffler is fixed at at least one of the attachment locations (42) via a connection which permits a limited relative movement between the exhaust-gas muffler (14) and the internal combustion engine (5) in at least one direction.

Abstract: A manually guided implement having an engine housing and a handle housing that are interconnected by anti-vibration elements. The handle housing is provided with a longitudinal support having, relative to a conventional operating position of the implement, a front end face that is disposed transverse to a longitudinal axis of the longitudinal support. A securement end of a front tubular handle rests against and is secured to the front end face of the longitudinal support.

Abstract: An implement having a drive motor and a tool is provided. A drive shaft is mounted in a guide tube and interconnects the drive motor and tool for rotatingly driving the tool. The drive shaft includes a main member in the form of a hollow shaft having ends on which are disposed respective extensions that form a coupling connection for a positive engagement with coupling components of the drive motor and of the tool.

Abstract: An implement having a drive motor and a tool is provided. A drive shaft is mounted in a guide tube and interconnects the drive motor and tool for rotatingly driving the tool. The drive shaft includes a main member in the form of a hollow shaft having ends on which are disposed respective extensions that form a coupling connection for a positive engagement with coupling components of the drive motor and of the tool.

Abstract: An arrangement for securing a component on a bolt is provided, wherein a shaft of the bolt extends through an opening of the component. A ring is disposed on the shaft, and is secured against axial displacement on a surface of the shaft. The ring has at least one radially extending widened portion that inter-engages an edge of the opening of the component.

Abstract: The invention relates to a connection of a crankcase (3) of an internal combustion engine (1) to a cylinder housing (2) of which at least one housing part is made of light metal. The housing parts (2, 3) lie with their respective housing flanges (4, 5) in surface contact one against the other and are clamped seal-tight to each other with the aid of retaining screws (7). The retaining screws (7) are of light metal and a curing liquid seal (18) is between the housing flanges (4, 5) so as to lie against both sides. In this way, a connection for a light metal cylinder housing (2) with a crankcase (3) is achieved by using light metal housing materials. A reliable seal is provided which is permanently resistant to the operating loads of the engine (1).

Abstract: The invention relates to a connection of a crankcase (3) of an internal combustion engine (1) to a cylinder housing (2) of which at least one housing part is made of light metal. The housing parts (2, 3) lie with their respective housing flanges (4, 5) in surface contact one against the other and are clamped seal-tight to each other with the aid of retaining screws (7). The retaining screws (7) are of light metal and a curing liquid seal (18) is between the housing flanges (4, 5) so as to lie against both sides. In this way, a connection for a light metal cylinder housing (2) with a crankcase (3) is achieved by using light metal housing materials. A reliable seal is provided which is permanently resistant to the operating loads of the engine (1).

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: The invention relates to a motor-driven chain saw having a motor mounted in a housing for driving a saw chain on a guide bar. The guide bar extends forwardly in the longitudinal direction of the chain saw from a forward housing end face. The housing is held by a grab handle for holding and guiding the chain saw. The handle has an upper segment projecting over the housing transversely to the longitudinal center axis of the guide bar. The upper segment extends at one end with a transition segment into a lateral segment lying approximately parallel to the plane of the guide bar and next to the housing. The cross section of the upper segment and the cross section of the lateral segment are configured in a shape which departs from the circular shape and are approximately the same. This affords an ergonomically advantageous hold and increases the operational safety.

Abstract: An arrangement introduces a metered volume of gas into a cavity filled with a melt of plastic. The cavity is defined by an injection mold for producing a hollow plastic body and the injection mold has an injection channel for introducing the molten plastic into the cavity. The arrangement includes a gas-injection nozzle assembly having a housing mounted in the mold and a member displaceably mounted in the housing so as to be movable between a first position and a second position located in spaced relationship to the injection channel. The housing and the member conjointly define a forward end portion of a nozzle assembly facing into the cavity at a region of the cavity spaced from the injection channel. A conducting channel in the forward end portion conducts the gas into the cavity when the member is in the second position. The conducting channel defines a gas-discharge opening for discharging the gas into the cavity.