Abstract: The invention pertains to a hand-operated tool (100) with a housing (12) and at least one handle (14) that is arranged on the housing such that it can be turned about an axis (13), wherein said handle comprises handle shells (15, 16) and a bearing part that is mounted on a counter bearing of the housing (12). The invention aims to develop a tool of this type that does not have the above-described disadvantages, particularly to make available a simple and inexpensive tool that can be easily assembled, and proposes that the first handle shell (15) and the bearing part are realized in one piece and the second handle shell (16) to be mounted on the first handle shell (15) is realized without a bearing part.

Abstract: In order to provide a two-stroke motor, in particular for a portable, hand-guided working device with a combustion space formed in a cylinder and a piston guided in the cylinder so that it performs a lifting movement, at least one transfer port is provided which is formed at least from a combustion-space-side opening section, a rising section and a crankcase-space-side inlet section. The opening section is connected to the inlet section by the rising section arranged approximately parallel to the piston barrel. The motor has a small flow resistance because of its geometric design, despite maintaining small opening windows into the combustion space, and allows simple casting production. The transfer port forms in the inlet section a whole port which passes in a single-flow manner into the rising section and is divided by a division at least into a first partial port and a second partial port at least in the upper region of the rising section adjoining the opening section.

Abstract: The invention pertains to a trimming device with a motor-driven cutting tool that is rotatable about a shaft and with a shell-like reel protector (100), wherein said trimming device can be operated with different cutting tools. In order to achieve a simple adaptation of the reel protector to the respective tool used, the invention proposes that the reel protector (100) includes a first shell (10) that is rigidly connected to the trimming device and a second shell (11) that can be displaced relative to the first shell (10) in the direction (A) of the shaft of the cutting tool.

Abstract: A chainsaw includes an internal combustion engine with a fuel-air mixture inlet and a carburettor with a fuel-air mixture outlet disposed in the direction of flow of a fuel-air mixture in front of the fuel-air mixture inlet. A fuel-air mixture channel is provided between the fuel-air mixture outlet and the fuel-air mixture inlet. A lubricant guide is provided along components to be lubricated, such that the lubricant circuit is connected particularly effectively to the fuel supply of the internal combustion engine. A removal device for fuel with a recess which receives fuel and supplies the lubricant guide is provided between the fuel-air mixture outlet and the fuel-air mixture inlet.

Abstract: A drive system for a tool, particularly a chain saw, includes a fresh air inlet and an intake manifold arranged after the fresh air inlet in the flow direction of the fresh air that opens into a carburettor. A combustion engine is provided that is arranged after the carburettor in the flow direction of an air-fuel mixture produced in the carburettor, in which the carburettor is exposed to a lower level of thermal stress. At least one heat conducting cooling vane is connected to the carburettor and protrudes outwards into direct contact with the ambient fresh air.

Abstract: To provide an exhaust system (100) for a combustion engine having a housing (10) in which at least one aperture for an exhaust gas inlet (11) and an additional aperture for an exhaust gas outlet (12) are provided, and having a catalytic element that is arranged in the housing (10) of the exhaust system (100) for cleaning exhaust gases from the combustion engine, and which can be manufactured simply and inexpensively, yet still achieves a high conversion rate to satisfy increasingly stringent environmental regulations, it is suggested to arrange at least one cleaning unit (13) including at least the described catalytic element (14) and a reflection means (15) in housing (10) of the exhaust system (100), in which some or all of the exhaust gases are directed through the catalytic element (14) of the cleaning unit (13) before reaching the reflection means (15) disposed behind it, which directs the exhaust gases (22) through the catalytic element (14) again, this time from the other side.

Abstract: A diaphragm carburettor is connected via a suction port with the clean air side of an air filter. A regulating chamber with a fuel chamber is connected with the suction port, in which the fuel chamber is acted upon with underpressure from the suction port and is separated from a compensation chamber by a regulating diaphragm formed to control the fuel supply to the fuel chamber. The compensation chamber is connected via a compensation path with the clean air side of the air filter and/or with the suction port so that pressure vibrations are reduced in the compensation chamber. A control and/or regulating element associated with the compensation path alters the length and/or the diameter of the compensation path.

Abstract: In order to create a starter device (100) for starting an internal combustion engine, in particular for hand-held tools, chainsaws, lawnmowers, strimmers and the like, with a rotatable pulling medium roller (2) which can be brought into functional connection with the crankshaft of the internal combustion engine in order to bring about a rotation of the crankshaft, which starter device has a simply configured functional connection between the crankshaft and the pulling medium roller and effectively reduces the force peaks reaching the pulling medium roller, it is proposed that a deformation body (3) with an elastic deformation behaviour is arranged in the functional connection between the pulling medium roller (2) and the crankshaft, in which deformation body a leading or lagging of the crankshaft with respect to the pulling medium roller (2) can be compensated.

Abstract: The invention pertains to a device for starting an internal combustion engine for handheld equipment such as chain saws, lawn mowers, lawn trimmers and the like, or for vehicles such as mopeds, boats or miniature aircraft. The starting device features an output element into which a starter torque can be introduced when the starting device is actuated. The output element is functionally connected to a crankshaft of the internal combustion engine in order to introduce a crankshaft torque therein. The functional connection between the output element and the crankshaft introduces variable crankshaft torque into the crankshaft depending on the rotational angle of the crankshaft at a constant starter torque. This advantageously improves force or torque characteristics for largely operating the starter device independently of the compression phase and the expansion phase of the internal combustion engine.

Abstract: The invention relates to a chainsaw chain, especially for use in cutting concrete, comprising a plurality of teeth which are respectively provided with at least one cutting segment carrier and at least one cutting segment. The cutting segment comprises diamond punches which are melted into a binding material in such a way that they are embedded therein.

Abstract: A hand-guided work implement, in particular hedge clippers, is provided which includes a drive having an internal combustion engine for a cutting tool and a handle for a user's hand and at least one other handle at a distance from said one handle for the other hand of the user. A throttle lever is provided on one handle and is capable of being actuated by the user's hand, which controls the power of the drive. At least one brake lever for a starting brake of the cutting tool is provided on the at least one other handle. The starting brake can be adjusted between a brake position and a cutting position.

Abstract: To improve an intake device (100) for a handheld tool implemented having an air cleaner, particularly for a chainsaw, a cuffing-off grinder, or the like, which comprises an internal combustion engine (25) and a drive unit (20) for the attachment, the air cleaner cleaning combustion air, which is charged with dirt particles, for the engine (25), in that a centrifugal separator (30) separates the combustion air into at least one first air flow (31), which is freed from dirt particles as much as possible, and a second air flow (32), which is loaded with dirt particles, in particular to cause higher efficiency of the intake device, it is suggested that a blower (10) be situated on the drive unit (20), which sucks in the second air flow (32), by which cooling of the drive unit (20) is caused.

Abstract: To provide an exhaust system (100) for an internal combustion engine having a housing (10) in which there are provided at least one exhaust inlet port (15b) and another exhaust discharge port (15a), and a catalyst element (22), which is disposed within the housing (10) of the exhaust system (100) for purifying the exhaust of the internal combustion engine in such a manner that a substantial part of the exhaust at least is caused to flow through the catalyst element (22), that is readily manufacturable at a low cost and still allows for purification of the entire exhaust by the catalyst element without causing power loss to the internal combustion engine, it is suggested that the exhaust gases (27) alternately flow through the catalyst element (22) through an exhaust conducting means (17).

Abstract: An internal combustion engine includes a cylinder wall through which an exhaust port with an exhaust port inner surface is routed from a combustion chamber to an exhaust port opening in the cylinder wall. A pipe section is arranged in a section of the exhaust port following the exhaust port opening in the direction of the combustion chamber with a pipe section outer surface, which reduces the heat transfer from the exhaust gas from the exhaust port into the cylinder wall. The pipe section outer surface is spaced from the exhaust port inner surface through an air gap by sections along an entire outer circumference of the pipe section.

Abstract: A motor chain saw includes a housing with a housing wall, which has an opening for exhaust gases and a hood extending outside the housing through the opening, with a hood opening pointing to one side. Exhaust gases flowing from an interior of the housing in an exhaust jet (S) are guided to the outside through the opening. A fin is arranged on the opening and provides a silencer for exhaust gases directed towards a flow direction of the exhaust jet (S) escaping from the hood.

Abstract: The present invention relates to a method for starting an internal combustion engine using a starting device, an ignition spark from a spark plug of an internal combustion engine being controllable by the starting device as a function of the speed of the crankshaft, a progressive rise of the advance of the ignition angle before top dead center already being performed as a function of the crankshaft speed at low speeds below the idle speed, which is followed at rising crankshaft speed by a sudden drop of the advance of the ignition angle to a plateau of the idle speed range.

Abstract: In order to provide an exhaust muffler for an internal combustion engine, especially a portable implement, comprising a catalyst which is arranged in a housing which has at least one inlet opening and one outlet opening for exhaust gas flowing out from the internal combustion engine into the environment, in which the temperature of the exhaust gas in the area of the outlet into the environment is reduced substantially and/or a sufficiently long path length is made available so that flame development can be avoided especially in the outlet area of the exhaust muffler, it is proposed that the outlet opening has at least one means through which exhaust gas flows, which is arranged partially outside the housing and has an outlet facing the environment, whereby the flow path of the exhaust gas in the direction of the environment is lengthened.

Abstract: A drive system for a tool, particularly a chain saw, includes a fresh air inlet and an intake manifold arranged after the fresh air inlet in the flow direction of the fresh air that opens into a carburettor. A combustion engine is provided that is arranged after the carburettor in the flow direction of an air-fuel mixture produced in the carburettor, in which the carburettor is exposed to a lower level of thermal stress. At least one heat conducting cooling vane is connected to the carburettor and protrudes outwards into direct contact with the ambient fresh air.

Abstract: In order to provide an exhaust system for a combustion engine with an outer casing in which hot exhaust gas is introduced through an exhaust inlet and discharged from an exhaust outlet wherein the exhaust outlet is of a tubular, more preferably having a circular or oval cross section design which, in a simple way, preferably effectively lowers the exhaust gas temperature in the exhaust outlet it is proposed that arranged in the area of the tubular exhaust outlet is an exhaust swirling device having at least one guide blade through which the exhaust gas is deflected in the exhaust outlet.

Abstract: An exhaust system for an internal combustion engine includes an outer housing having a front shell and a rear shell, a prechamber in which exhaust gas from the combustion chamber enters, and an intermediate shell having a front and back as well as a catalytic converter holder. A catalytic converter element is arranged on the catalytic converter holder where an exhaust port directs exhaust gas from the catalytic converter element. To place the center of gravity of the exhaust system near the internal combustion engine or cylinder, the intermediate shell forms the prechamber and the exhaust port.