Abstract: The invention relates to a pneumatically operated drill hammer, comprising a piston and a distributor axially arranged relative to each other in a housing, the piston being arranged to be moved axially between a first position and a second position. The drill hammer further includes a pneumatic drive system, including a drive chamber, a return chamber and a plurality of channels for distribution of drive gas in said drive system. The return chamber is arranged at a lower side of the piston and the drive chamber is arranged at an upper side of the piston, wherein the drive chamber is defined by a variable space enclosed by at least the housing, the piston and the distributor. The drive chamber includes at least one inlet port and at least one exhaust port arranged at a circumference of the drive chamber.

Abstract: The invention relates to a pneumatically operated drill hammer, comprising a piston and a distributor axially arranged relative to each other in a housing, the piston being arranged to be moved axially between a first position and a second position. The drill hammer further includes a pneumatic drive system, including a drive chamber, a return chamber and a plurality of channels for distribution of drive gas in said drive system. The return chamber is arranged at a lower side of the piston and the drive chamber is arranged at an upper side of the piston, wherein the drive chamber is defined by a variable space enclosed by at least the housing, the piston and the distributor. The drive chamber includes at least one inlet port and at least one exhaust port arranged at a circumference of the drive chamber.

Abstract: A combustion system for engines having at least one cylinder (10). The system may e.g. consist of an exhaust duct, an intake duct (20a), a cylinder chamber (30), a fuel injector for injecting fuel into the cylinder chamber (30), a piston (40) performing a reciprocating motion in the cylinder chamber (30), and a valve (70) for intake and one for exhaust. The intake duct (20a) is connected to the cylinder chamber (30) and said intake valve (70) is operative to open and close, respectively, the connection between the intake duct (20a) and the cylinder chamber (30). The crown (60) of the piston (40) is provided with a cavity (50), shaped so as to enhance the generation of tumbling inside the cylinder chamber (30) during the intake stroke and to contribute to the breakdown during the compression stroke inside the cylinder chamber (30).

Abstract: A throttle for a motor driven hammer mechanism has a handle (2) connected to a machine housing (1), a first lever (3) swingably connected to the handle, a second lever (6) swingably connected to the first lever, and a spring (7) arranged between the two levers and a transfer device (4) for transferring the movement of the levers to an operating arm (15) on a speed regulator arranged in the hammer mechanism.

Abstract: An apparatus for the inward or final folding of end portions of a covering on a panel (5). The covering (1) surrounds the panel (5) and extends out over one edge to such an extent that at least first inward folds (17, 18) overlap one another from two opposite edges. Second inward folds (16) from the two opposing edges are located inside the overlapping, first inward folds (17, 18). A corner support (21) is placeable in the corner for folding of the second inward fold (16) about the corner support (21), with the aid of a stirrup (38) which is switchable for inward folding of the second inward fold (16) about the corner support (21) while leaving exposed an adhesive application surface on the second inward fold (16). A first folder (43) is provided for inward folding of one first inward fold (17), and a second folder (44) is provided for inward folding of another first inward fold (18) after application of adhesive to the adhesive application surface.