Abstract: A device for sealing a gap (7) between a first cylindrical part (2) and a second cylindrical part (5), in which the first cylindrical part (2) is received, includes a sealing ring (8) located in a circumferential groove (9) formed in the outer circumferential surface of the first cylindrical part (2), and at least one elastic element (10) located in the circumferential groove (3) for biasing the sealing ring (8) radially outwardly.

Abstract: A combustion-engined setting tool for driving fastening elements into a constructional component includes a piston guide (12) adjoining the combustion chamber (14), a drive piston displaceable in the piston guide (12) under action of expanding combustion gases produced by combustion of oxidation medium-fuel mixture in the combustion chamber (14), at least on magnetic piston-retaining element (31) for temporarily retaining the drive piston (13) at the combustion chamber (14); and at least one magnetic conducting element (32) for transmitting a magnetic holding force from the magnetic piston-retaining element (31) to the drive piston (13).

Abstract: A setting tool for driving fastening elements into constructional components and parts and including a guide tube (3) for guiding a fastening element out, a device for displacing the fastening element through the side cut-out (13) formed in the guide tube (3) into interior of the guide tube (3), and a feeler element extending into the interior of the guide tube (3) opposite the side cut-out (13) with a depth by which the feeler element extends into the interior of the guide tube (3) being determined by a fastening element to-be-displaced into the interior of the guide tube (3).

Abstract: A setting tool including a bolt guide (2) secured in the tool housing (1) against displacement in an axial direction, a spring-biased press-on feeler (6) and an axially displaceable safety sleeve (9) surrounding the press-on feeler (6) and supported for joint axial displacement with the press-on feeler and for axial displacement relative thereto.

Abstract: A method of controlling operation a portable, internal combustion engined power tool including a combustion chamber (1), at least one suction/discharge valve (34)associated with the combustion chamber (1), and an operational piston (8) the method including inquiring a displacement position of the operational piston (8) of the power tool when it is being displaced to its initial position after having performed an operational stroke upon ignition of a fuel gas mixture filling the combustion chamber, and releasing the at least one suction/discharge valve (34) upon the piston (8) reaching its initial position; and a power tool which is controlled by the method.

Abstract: A method of driving a piston (80 of a portable, internal combustion, engine tool by combusting a combustible gas mixture in a combustion chamber (1) having a combustion chamber wall (14) located opposite the piston (8), the method including dividing the combustion chamber (1) in at least two chamber sections (21, 22) by providing, between the combustion chamber wall (14) and the piston (8), a separation plate (18) having a plurality of through-openings (38) and separately adjusting the combustible gas mixture in each chamber section (21, 22).

Abstract: A portable, internal combustion-engined tool includes a combustion chamber (1), a piston (8) adjoining the combustion chamber (1), with a pressure build-up in the combustion chamber (1) providing for movement of the piston (8) from its initial position, in which the piston adjoins the combustion chamber (1), away from the combustion chamber (1). A brake device (43) retains the piston (8) substantially in its initial position during build-up of pressure in the combustion chamber (1), with a braking force applied to piston (8) being changeable for adjusting the amount of energy generated in the combustion chamber and transmittable to the piston (8).

Abstract: A device for creating a laminar flame front in an internal combustion-engined tool having a combustion chamber (1) with two walls (14, 18) extending parallel to each other, the device including a cage (51) located between the two walls (14, 18) and having a plurality of openings (53) formed in an otherwise solid circumferential wall of the cage (51), and an ignition element (52) located in a cage interior for igniting a combustible gas mixture located between the two walls (14, 18).

Abstract: A portable, combustion-engined tool including a collapsible combustion chamber (1) having a movable separation plate (18) for dividing the combustion chamber (1), in an expanded position of the combustion chamber, in a forechamber section (21) and at least one further chamber section (22), a movable combustion chamber wall (14) arranged parallel to the separation plate (18) for limiting, together with the separation plate (18), the forechamber section, an ignition device (52) located in the forechamber section (21), and a collapse control device (19, 20, 33) for controlling movement of the separation plate (18) and the movable wall (14) after the combustion of the gas mixture in the combustion chamber.

Abstract: A portable, combustion-engined tool including a combustion chamber (1) in which a fuel gas in combusted upon ignition for building up pressure in the combustion chamber for driving the tool piston (8), an ignition device (20) for igniting the fuel gas in the combustion chamber (1), and gas drain means (43) provided in the combustion chamber (1) for controlling a pressure build-up therein.

Abstract: A method of controlling operation of a portable, combustion-engined tool including a combustion chamber (1) an inlet/outlet valve (26) of which is closed or is opened dependent on an operational phase of the tool, with the method including igniting a fuel gas mixture filling the combustion chamber (1) for build-up of gas pressure therein and closing or opening the inlet/outlet valves (26) dependent on the gas pressure developed in the combustion chamber (1), and a tool in which the method is implemented.

Abstract: A metering head for delivering a liquified fuel gas in different combustion chamber sections of a tool and including an inlet (8), at least two outlets (16, 17), and at least one metering valve (5, 5a, 5b) connecting the inlet (8) with the at least two outlets (16, 17).

Abstract: A method of controlling operation a portable, internal combustion engined power tool including a combustion chamber (1), at least one suction/discharge valve (34) associated with the combustion chamber (1), and an operational piston (8) the method including inquiring a displacement position of the operational piston (8) of the power tool when it is being displaced to its initial position after having performed an operational stroke upon ignition of a fuel gas mixture filling the combustion chamber, and releasing the at least one suction/discharge valve (34) upon the piston (8) reaching its initial position; and a power tool which is controlled by the method.

Abstract: A setting tool including a bolt guide (2) secured in the tool housing (1) against displacement in an axial direction, a spring-biased press-on feeler (6) and an axially displaceable safety sleeve (9) surrounding the press-on feeler (6) and supported for joint axial displacement with the press-on feeler and for axial displacement relative thereto.

Abstract: A method of controlling operation of a portable, combustion-engined tool including a combustion chamber (1) an inlet/outlet valve (26) of which is closed or is opened dependent on an operational phase of the tool, with the method including igniting a fuel gas mixture filling the combustion chamber (1) for build-up of gas pressure therein and closing or opening the inlet/outlet valves (26) dependent on the gas pressure developed in the combustion chamber (1), and a tool in which the method is implemented.

Abstract: A portable, combustion-engined tool including a combustion chamber (1), a piston (8) adjoining the combustion chamber (1), with a pressure build-up in the combustion chamber (1) providing for movement of the piston (8) from its initial position, in which the piston adjoins the combustion chamber (1), away from the combustion chamber (1), a brake device (43) for retaining the piston (8) substantially in its initial position during build-up of pressure in the combustion chamber (1), and elements for changing a braking force applied to piston (8).

Abstract: A portable, combustion-engined tool including a collapsible combustion chamber (1) having a movable separation plate (18) for dividing the combustion chamber (1), in an expanded position of the combustion chamber, in a forechamber section (21) and at least one further chamber section (22), a movable combustion chamber wall (14) arranged parallel to the separation plate (18) for limiting, together with the separation plate (18), the forechamber section, an ignition device (52) located in the forechamber section (21), and a collapse control device (19, 20, 33) for controlling movement of the separation plate (18) and the movable wall (14) after the combustion of the gas mixture in the combustion chamber.

Abstract: A portable, combustion-engined tool including a combustion chamber (1) in which a fuel gas in combusted upon ignition for building up pressure in the combustion chamber for driving the tool piston (8), an ignition device (20) for igniting the fuel gas in the combustion chamber (1), and gas drain means (43) provided in the combustion chamber (1) for controlling a pressure build-up therein.