Abstract: A protective shield (2) is provided for a free-cutting tool (1). The free-cutting tool has a cutterhead (4) rotatable about a rotational axis (3) and carries a cutting filament (5). For a rotating cutterhead (4), the cutting filament (5) rotates in a rotational direction (10), aligns itself approximately radially to the rotational axis (3) and defines a cutting circle (6) having a constructively pregiven nominal radius (R). The cutting radius (6) is at least partially covered by the protective shield (2). A cut-to-length knife (7) having a cutting edge (8) for cutting the cutting filament (5) to length is mounted on the protective shield (2) in the peripheral region thereof. The cut-to-length knife (7) is mounted on the protective shield (2) to be moveable back and forth between a cutting position (11) and a rest position (12).

Abstract: The invention relates to a process for the removal of sour gas from pressurised natural gas which polluted by sulphur compounds and other sour gas compounds, the natural gas, which is to be desulphurised, being initially fed into sour gas absorption unit, in which the sulphur components and any other components are absorbed by a physically acting solution, the absorbate being heated, the absorbate being fed into a high-pressure flash unit, in which the sour-gas-poor absorbent and desorbed sour gas contained in the resulting mixture are separated, the desorbed sour gas being cooled and the vaporised absorbent being condensed out of the sour gas stream, a pressure being set in the high-pressure flash unit that permits the desorbed sour gas to be condensed by means of cooling water or cooling air, the sour-gas-poor absorbent from the high-pressure flash unit being freed from sour gas residues in a gas stripping unit by means of stripping gas, and the absorbent obtained being cooled and recycled to the sour gas a

Abstract: A manually operated implement such as a chain saw, a parting-off grinder or similar device has an internal combustion engine to drive a tool and a handle arrangement to operate the implement. The handle arrangement is connected to the internal combustion engine via a vibration damping system, the vibration damping system comprising at least one anti-vibration element. In order to achieve good vibration damping and sufficient operational rigidity in all operating ranges, in at least one direction of vibration in a predetermined frequency range the anti-vibration element has a first characteristic curve in a first state and a second characteristic curve in a second state and the anti-vibration element can be switched between the first state and the second state.

Abstract: A housing cover arrangement of a hand-held power tool has a cover having a cover edge and a lateral surface delimited by the cover edge. At least one spring clip is provided that removably connects the cover to a part of the power tool. The at least one spring clip is disposed, when securing the cover to the part, on the lateral surface in the area of the cover edge and is oriented in a clamping direction that extends transversely to the cover edge. At least two supports are disposed along the cover edge and act in the clamping direction. The at least one spring clip is arranged between the at least two supports.

Abstract: With the help of a method of selective removal of hydrogen sulphides, organic sulphur components and CO2 from crude gases, by using a first and second absorption stage (41 or 49) for separating almost pure CO2, a solution has to be found, with which, among other things, hydrogen sulphides and organic sulphur compounds can be removed in as selective a manner as possible. This is achieved as follows: the absorption agent coming out of the first absorption stage (41) and enriched with hydrogen sulphide and CO2 a.o.

Abstract: The invention relates to a method for producing unsaturated hydrocarbons. According to said method, in a first step, a hydrocarbon, especially a mixture which contains alkanes, essentially no water, and can contain water vapour, is continuously guided through a first catalyst bed provided with standard dehydration conditions. Liquid water, water vapour and a gas containing oxygen are then added to the reaction mixture obtained in the first step and, in a second step, the reaction mixture obtained is then continuously guided through another catalyst bed for oxidising hydrogen and for further dehydrating hydrocarbons. The first catalyst bed can be heated and the heating in the first step is then preferably regulated in such a way that an essentially isothermic operating mode is created.

Abstract: A portable handheld work apparatus includes a drive motor (1) and a vibration suppressor (2) which is rotatably driven by the drive motor (1). The vibration suppressor (2) compensates or absorbs translatory vibrations. The vibration suppressor includes suppression masses (4, 5, 6) for generating a targeted imbalance. The suppression masses (4, 5, 6) are arranged at a radius to the rotational axis (3) of the vibration suppressor (2). At least one suppression mass (5, 6) is mounted so as to be changeable in its position in dependence upon rpm.

Abstract: An antivibration unit of a portable handheld work apparatus includes a leg spring (3) having at least one wire turn (5) and at least one first wire leg (6). The wire turn (5) extends about a turn or coil axis (4) and is attached at the first component assembly (1) and the first wire leg (6) extends outwardly and tangentially from the wire turn (5). A wire leg end (7) of the wire leg (6) is attached to the second component assembly (2).

Abstract: A manually guided implement, especially a brush cutter, comprising a guide tube with a guide motor at one end and a tool head that carries a rotatably drivable tool at the opposite end. A handle is disposed on a securement mechanism, and a handle carrier is disposed between the securement mechanism and the guide tube. The handle carrier is fixed in position on the guide tube along a short range relative to the longitudinal direction of the guide tube. The securement mechanism is adjustably held on the handle carrier such that the position of the securement mechanism relative to the longitudinal direction is adjustable.

Abstract: An antivibration device is mounted between a motor unit (1) having an internal combustion engine (2) and a vibration-insulated unit (3) of a portable handheld work apparatus (4) such as a motor-driven chain saw, cutoff machine, suction/blower apparatus or the like. The antivibration device (5) includes a vibration damper (6) made of foamed elastic material (7).

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 muffler arrangement includes an exhaust-gas muffler, which is subdivided into an inlet space and an outlet space. An exhaust-gas stub of an internal combustion engine opens into the inlet space. Exhaust gas is conducted from the outlet space into an air channel via an exhaust-gas outlet. The air channel is formed between the housing of the exhaust-gas muffler and an outer cover and extends along a side of the exhaust-gas muffler. A cooling-air component flow is branched from a cooling-air flow of a cooling-air blower and enters at a first end of the air channel. The cooling-air component flow exits again at the second end of the air channel.

Abstract: In order to reduce the formation of inherent vibrations in the coil spring in an anti-vibration element, in particular for a manually operated tool such as a chainsaw, a parting-off grinder or similar device and having a coil spring, an additional mass is positioned on the coil spring.

Abstract: A manually operated implement such as a chain saw, a parting-off grinder or similar device has an internal combustion engine to drive a tool and a handle arrangement to operate the implementl. The handle arrangement is connected to the internal combustion engine via a vibration damping system, the vibration damping system comprising at least one anti-vibration element.

Abstract: A portable work apparatus, especially a motor-driven chain saw (1), has a drive unit which is provided with a handle housing (3). The handle housing (3) includes an extension (9) which extends in the longitudinal direction of the work apparatus from a rearward handle (8) on the side facing away in the longitudinal direction from a guide bar (6) forward to the side facing toward the guide bar (6). The handle housing (3) is connected via antivibration elements to the drive unit. The work apparatus has a forward handle tube (4), which extends over the work apparatus transversely to the longitudinal direction and is attached with an end (10) to the free end of the extension (9) and with the other end (27) in the area of the rearward handle (8). At least one of the ends (10, 27) of the handle tube (4) is fixed via an antivibration element (11, 25, 26, 28, 34).

Abstract: An antivibration device is mounted between a motor unit (1) having an internal combustion engine (2) and a vibration-insulated unit (3) of a portable handheld work apparatus (4) such as a motor-driven chain saw, cutoff machine, suction/blower apparatus or the like. The antivibration device (5) includes a vibration damper (6) made of foamed elastic material (7).

Abstract: An antivibration element (1) is especially for a portable handheld work apparatus such as a motor-driven chain saw or a brushcutter. The antivibration element includes a coil spring (2) and at least one guide. An end section (7, 8) of the coil spring (2) is fixed to the guide. In order to provide a progressive characteristic line of the coil spring (2) in a simple way, the coil spring (2) has a transition section (11, 12), which borders at the end section (7, 8) and is guided with play on the guide.

Abstract: A manually guided, motor-driven implement is provided that has a housing for a motor, especially an internal combustion engine, that drives a working tool of the implement. In order for a power chain saw to mount a handle on the housing of the motor in a vibration dampening manner such that due to the mounting a structurally prescribed dampening frequency range is effected, one or more hydraulic mounts are disposed between the handle and the motor of the power chain saw.

Abstract: An internal combustion engine for a manually guided implement is provided and has a cylinder, a reciprocating piston that is longitudinally displaceable in the cylinder, a rotatable crankshaft and a connecting rod for connecting the piston and the crankshaft. By means of a clutch, a tool that is to be driven can be connected to the internal combustion engine. To improve engine operation and at the same time keep a low overall weight, a rotary oscillation eliminator is provided on the engine side of the clutch and in the direction of flow of power from the internal combustion engine to the tool.

Abstract: The invention is directed to a carburetor arrangement in a housing (1) and especially in the housing of a work apparatus such as a motor-driven chain saw or like portable handheld work apparatus. An engine (2) is mounted in the housing (1) and has an inlet channel (3) which is connected via a connecting pipe (4) to the intake channel section (5) of a membrane carburetor (6). An intake air filter (10) is mounted on the carburetor (6) on the end face (17) facing away from the connecting pipe (4). Combustion air is supplied through the intake air filter (10). To avoid a damaging warming of the carburetor, a heat-draining component (20) is mounted on the end face (17) of the carburetor which faces away from the connecting pipe (4). The component (20) projects beyond the contour of the carburetor (6).