Abstract: A pruner includes a housing and a drive motor. The drive motor drives a saw chain, which is guided in a guide groove of a guide bar, in a rotary motion via a drive chain sprocket. A fastening section for receiving a first rechargeable battery pack for supplying the drive motor with electrical energy is provided on a rear end of the housing. The fastening section is provided for receiving a second rechargeable battery pack. The fastening section is arranged on the housing, in particular at least on the first handle, in such a way that a center of gravity of the pruner lies in the first handle when the pruner is in a state in which the first rechargeable battery pack and the second rechargeable battery pack are arranged on the fastening section.

Abstract: A portable work apparatus has a housing, a drive motor arranged in the housing, a guide bar with a longitudinal center axis, and a saw chain. The drive motor drives the saw chain in a rotating manner in a guide groove of the guide bar via a drive sprocket. A longitudinal plane of the guide bar is spanned by the guide groove. A discharge opening for discharging chips from the sprocket area into the outside surroundings is formed on the housing. The discharge opening has a first section formed on the first longitudinal side of the chainsaw, and a height measured parallel to the longitudinal plane and perpendicularly to the longitudinal center axis of the guide bar. The height is at least 5 mm.

Abstract: A closure cap for an operating medium tank is provided with a closure device projecting into a fill socket of the operating medium tank. The closure device has a first cap element, a second cap element, and a sealing ring arranged between the first and second cap elements. A lifting assembly axially moves by an axial travel the first and second cap elements relative to each other for opening and closing the fill socket. The lifting assembly has a pressure member acting axially on one of the first and second cap elements. A grip member is provided that is rotatable about a hub and actuates the lifting assembly. A cover disk covering at least partially the fill socket relative to an exterior is connected fixedly to the pressure member of the lifting assembly. The cover disk rotates, together with the pressure member, about the hub.

Abstract: A closure cap for an operating medium tank is provided with a closure device projecting into a fill socket of the operating medium tank. The closure device has a first cap element, a second cap element, and a sealing ring arranged between the first and second cap elements. A lifting assembly axially moves by an axial travel the first and second cap elements relative to each other for opening and closing the fill socket. The lifting assembly has a pressure member acting axially on one of the first and second cap elements. A grip member is provided that is rotatable about a hub and actuates the lifting assembly. A cover disk covering at least partially the fill socket relative to an exterior is connected fixedly to the pressure member of the lifting assembly. The cover disk rotates, together with the pressure member, about the hub.

Abstract: An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod (6), a crankshaft (7) pivotably mounted in a crankcase. The connecting rod is connected to the piston via a piston pin. An inlet window for combustion air is provided and controlled by the piston. The piston separates a combustion chamber from the crankcase interior space and has a piston base the underside of which is oriented toward the crankcase. To achieve good cooling of the piston and of the piston pin bearing, a first flow-guide element is provided within the crankcase interior space adjacent to the inlet window. The first flow-guide element redirects the combustion air flowing in through the inlet window in the direction of the underside of the piston base.

Abstract: An internal combustion engine of a manually operated implement, having an elastic connecting duct between the engine and an air filter for vibration-decoupled bridging of a vibration gap between engine and the air filter. The elastic connecting duct has a first conduit for fuel/air mixture and a second conduit for largely fuel-free air. The first and second conduits are separate tubes having respective bores that are separated from one another over their entire lengths, the inlet of the engine is operatively connected to the air filter via the first conduit, and an air duct window of the engine is operatively connected to the air filter via the second conduit.

Abstract: An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod (6), a crankshaft (7) pivotably mounted in a crankcase. The connecting rod is connected to the piston via a piston pin. An inlet window for combustion air is provided and controlled by the piston. The piston separates a combustion chamber from the crankcase interior space and has a piston base the underside of which is oriented toward the crankcase. To achieve good cooling of the piston and of the piston pin bearing, a first flow-guide element is provided within the crankcase interior space adjacent to the inlet window. The first flow-guide element redirects the combustion air flowing in through the inlet window in the direction of the underside of the piston base.

Abstract: An internal combustion engine of a manually operated implement, having an elastic connecting duct between the engine and an air filter for vibration-decoupled bridging of a vibration gap between engine and the air filter. The elastic connecting duct has a first conduit for fuel/air mixture and a second conduit for largely fuel-free air. The first and second conduits are separate tubes having respective bores that are separated from one another over their entire lengths, the inlet of the engine is operatively connected to the air filter via the first conduit, and an air duct window of the engine is operatively connected to the air filter via the second conduit.

Abstract: The invention is directed to an exhaust-gas muffler (1) of a handheld work apparatus driven by an internal combustion engine. The exhaust-gas muffler (1) includes a muffler housing (2) which includes an engine-end wall (3) having an inlet window (4) as well as an outlet (5). Attachment means (6) for fixing the exhaust-gas muffler (1) on the internal combustion engine are provided on the engine-end wall (3) in the region of the inlet window (4). The engine-end wall (3) is provided with a reinforcing sheet metal piece (7) on the inner side of the exhaust-gas muffler (1) in the region of the attachment device (6). A discharge channel (8), which leads to the outlet (5), is formed at least between a part region of the reinforcing sheet metal piece (7) and the adjoining region of the muffler housing (2).

Abstract: A tubular handle for a manually guided implement, especially a power chain saw or the like, is provided. The handle has an essentially circular cross-section and at least one mounting portion for fixing the handle to the implement. In the area of the mounting portion, the circular cross-section is flattened to form an at least approximately planar abutment portion, beyond which a circular cross-sectional portion is retained. The abutment portion is provided for fixing the tubular handle to the implement.

Abstract: The invention relates to an attachment pin (1) for fixing an exhaust-gas muffler (2) in an apparatus part (4) of a portable handheld work apparatus (5) driven by an internal combustion engine. The exhaust-gas muffler (2) includes especially an exhaust-gas catalytic converter (3). An at least partially exposed region (6) is provided with a cooling surface (7) and is on the attachment pin (1) between the exhaust-gas muffler (2) and the apparatus part (4).

Abstract: A housing cover arrangement of a portable handheld work apparatus includes a releasable cover (1) and at least one spring clamp (2) for attaching the cover (1). The spring clamp (2) is pivotally held at one end (3) so it cannot separate and has an elastic latching spring lug (5) at its opposite-lying end (4). The spring clamp (2) is bent over to an approximately U-shaped section (6) at its pivot end (3). An open end (7) of the U-shaped section (6) is closed by an elastic plastic latch (8) while forming a pivot receptacle (9) for a pivot lug (10). The pivot receptacle (9) is essentially closed.

Abstract: A piston for a two-cycle engine having a piston head and a piston wall in which are disposed wrist pin eyes. At least one undercut is formed between the underside of the piston head and the wrist pin eyes at a distance from the piston head. The undercut extends from the interior of the piston toward the piston wall. A respective thickened portion is provided in at least one region of the piston that is rotationally shifted about the longitudinal axis of the piston by 90° relative to one of the wrist pin eyes. The thickened portion is disposed at a distance below the piston head and extends into the interior of the piston.

Abstract: The invention relates to an attachment pin (1) for fixing an exhaust-gas muffler (2) in an apparatus part (4) of a portable handheld work apparatus (5) driven by an internal combustion engine. The exhaust-gas muffler (2) includes especially an exhaust-gas catalytic converter (3). An at least partially exposed region (6) is provided with a cooling surface (7) and is on the attachment pin (1) between the exhaust-gas muffler (2) and the apparatus part (4).

Abstract: The invention is directed to an exhaust-gas muffler (1) of a handheld work apparatus driven by an internal combustion engine. The exhaust-gas muffler (1) includes a muffler housing (2) which includes an engine-end wall (3) having an inlet window (4) as well as an outlet (5). Attachment means (6) for fixing the exhaust-gas muffler (1) on the internal combustion engine are provided on the engine-end wall (3) in the region of the inlet window (4). The engine-end wall (3) is provided with a reinforcing sheet metal piece (7) on the inner side of the exhaust-gas muffler (1) in the region of the attachment device (6). A discharge channel (8), which leads to the outlet (5), is formed at least between a part region of the reinforcing sheet metal piece (7) and the adjoining region of the muffler housing (2).

Abstract: A tubular handle for a manually guided implement, especially a power chain saw or the like, is provided. The handle has an essentially circular cross-section and at least one mounting portion for fixing the handle to the implement. In the area of the mounting portion, the circular cross-section is flattened to form an at least approximately planar abutment portion, beyond which a circular cross-sectional portion is retained. The abutment portion is provided for fixing the tubular handle to the implement.

Abstract: A one-piece elastic connecting duct for disposition between any air filter and an internal combustion engine of a manually operated implement, such as a power saw, a cut-off machine, or the like, is provided. The connecting duct comprises a first conduit for fuel/air mixture, and a second conduit for largely fuel-free air.

Abstract: A catalytic converter for the after-treatment of the exhaust gas from an internal combustion engine is provided. The catalytic converter has a housing having an internal space for receiving exhaust gas therethrough. Surfaces of walls of the housing facing the internal space are at least partially provided with catalytically active material in a flow path between inlet and outlet openings for exhaust gas. Hollow domes are provided on oppositely disposed walls of the housing, and extend into the internal space. The free ends of the hollow domes are provided with the outlet openings, and the free ends of those hollow domes on one of the walls extend beyond the free ends of the hollow domes of the oppositely disposed wall.

Abstract: A hand-held working tool has a drive motor and a grip connected at a distance to the drive motor. Operating elements, including a throttle lever, a choke actuator, and a short-circuiting switch, are connected to the grip for controlling the drive motor. A transmission device, including a Bowden cable arrangement with a sleeve and a cable enclosed by the sleeve, is provided for connecting the operating elements to the drive motor. The transmission device has an inner tube inserted into the Bowden cable arrangement wherein the inner tube is positioned between the sleeve and the cable so as to be longitudinally displaceable relative to the sleeve and the cable.

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.