Abstract: A propeller nozzle for watercraft, includes a nozzle and a propeller having at least one propeller blade which can rotate about a propeller axis and which spans a propeller area through rotation about the propeller axis. The propeller blade has a propeller blade end region wherein the propeller is disposed inside the nozzle in such a manner that a circumferential gap in the circumferential direction of the propeller nozzle is formed between the propeller end region and the inner wall of the nozzle. A marginal flow running from a nozzle in the area of the inner wall of the nozzle can flow through the gap, wherein the performance losses which occur due to turbulence of the marginal flow during flow around the propeller blade end region are kept as low as possible. Flow guiding apparatus guides at least one part of the marginal flow onto the propeller area.

Abstract: A pneumatic hammer mechanism is disclosed. The hammer mechanism features: a flying mass, which is movable along an impact axis; an impact surface, which limits a movement of the flying mass along the impact axis in the impact direction; an exciting piston, which limits a movement of the flying mass along the impact axis opposite from the impact direction; a pneumatic chamber between the flying mass and exciting piston; a drive for periodically moving the exciting piston with a stroke along the impact axis, wherein the flying mass is excited to a periodic movement between the impact surface and exciting piston. The stroke is selected as a function of a maximum length of the pneumatic chamber such that the periodic movement of the flying mass on the path between an impact on the impact surface and a minimum approach of the exciting piston intermittently has a velocity of zero.

Abstract: A pneumatic hammer mechanism is disclosed. The hammer mechanism includes: a flying mass; an impact surface which limits a movement of the flying mass along the impact axis in the impact direction; an exciting piston which limits a movement of the flying mass opposite from the impact direction; a pneumatic chamber between the flying mass and exciting piston; and a drive for periodically moving the exciting piston with a stroke along the impact axis.

Abstract: A pneumatic hammer mechanism is disclosed. The hammer mechanism features: a flying mass, which is movable along an impact axis; an impact surface, which limits a movement of the flying mass along the impact axis in the impact direction; an exciting piston, which limits a movement of the flying mass along the impact axis opposite from the impact direction; a pneumatic chamber between the flying mass and exciting piston; and a drive for periodically moving the exciting piston with a stroke along the impact axis. The flying mass is excited to a periodic movement between the impact surface and a minimum approach of the exciting piston. A length ratio of the maximum length of the pneumatic chamber to the stroke is selected as less than 1.55.

Abstract: A propeller nozzle for watercraft, includes a nozzle and a propeller having at least one propeller blade which can rotate about a propeller axis and which spans a propeller area through rotation about the propeller axis. The propeller blade has a propeller blade end region wherein the propeller is disposed inside the nozzle in such a manner that a circumferential gap in the circumferential direction of the propeller nozzle is formed between the propeller end region and the inner wall of the nozzle. A marginal flow running from a nozzle in the area of the inner wall of the nozzle can flow through the gap, wherein the performance losses which occur due to turbulence of the marginal flow during flow around the propeller blade end region are kept as low as possible. Flow guiding apparatus guides at least one part of the marginal flow onto the propeller area.

Abstract: A hand-held power tool includes a motor-driven percussion mechanism. The percussion mechanism includes a guide tube (21) and a reciprocating driving member (22) displaceable in the guide tube (21) for driving, via a gas spring, an impact member (23) likewise displaceable in the guide tube (21). The percussion mechanism further includes a motor-driven eccentric wheel (17) rotatable about an axis (D) which is spaced from the percussion mechanism axis (S) in a direction perpendicular to the percussion mechanism axis (S) by a distance (X). A connection rod (29) is eccentrically supported on the eccentric wheel (17) and connected to the driving member (22) for converting a rotational movement of the eccentric wheel (17) into a reciprocating movement of the driving member (22).

Abstract: A vehicle interior decor element, in particular an air bag cover, comprising a front side (36) facing the vehicle interior and an opposite rear side (34), a cover (18) and a decorative element (20) which is provided at the cover (18), is visible from the front and is at least partly translucent. The decorative element (20) includes sections (24) between which the decorative element (20) has a gap (26) through which the cover (18) is accessible from the front side (36). The decorative element (20) extends with at least one portion (44) thereof towards the rear side (34) towards or into a cavity (42) which is formed in the cover (18) and in which an illuminant (50) for illuminating the decorative element (20) is accommodated.

Abstract: A hand-held power tool includes a percussion power tool includes a percussion piston (5) for applying blows to an anvil (8) axially displaceable in a guide tube (6) within limits defined by two, spaced from each other, stops (9a, 9b) arranged in the guide tube (6), a pneumatic percussion mechanism (2) for driving the percussion piston (5), an air spring (3) for connecting the percussion piston (5) with the percussion mechanism (2), and an impact ring (12) arranged coaxially with the anvil (8) outwardly thereof and having spaced from each other, inner radical flanks (14) located on opposite axial sides of the outer radial collar (11) provided on the anvil (8), with the impact ring (12) freely axially displaceable, within limits, relative to the outer radial collar (11) and having an outer diameter smaller than a guiding inner diameter of the guide tuber (6), and with a mass ratio of the impact ring (12) to the anvil (8) being equal at least 0.25.

Abstract: A gas bag cover for a vehicle occupant restraint system has a plastic cap (12) with a front face (14) and a rear face (16) facing a gas bag (17), and a decorative element (18) provided on the front face (14). The decorative element (18) is welded to the plastic cap (12). Furthermore, a method of manufacturing such a gas bag cover (10) is described.

Abstract: A pneumatic hammer mechanism is disclosed. The hammer mechanism features: a flying mass, which is movable along an impact axis; an impact surface, which limits a movement of the flying mass along the impact axis in the impact direction; a hammer piston, which limits a movement of the flying mass along the impact axis opposite from the impact direction; a pneumatic chamber between the flying mass and hammer piston; a drive for periodically moving the hammer piston with a stroke along the impact axis, wherein the flying mass is excited to a periodic movement between the impact surface and hammer piston. The stroke is selected as a function of a maximum length of the pneumatic chamber such that the periodic movement of the flying mass on the path between an impact on the impact surface and a minimum approach of the hammer piston intermittently has a velocity of zero.

Abstract: A pneumatic hammer mechanism is disclosed. The hammer mechanism features: a flying mass, which is movable along an impact axis; an impact surface, which limits a movement of the flying mass along the impact axis in the impact direction; a hammer piston, which limits a movement of the flying mass along the impact axis opposite from the impact direction; a pneumatic chamber between the flying mass and hammer piston; and a drive for periodically moving the hammer piston with a stroke along the impact axis. The flying mass is excited to a periodic movement between the impact surface and a minimum approach of the hammer piston. A length ratio of the maximum length of the pneumatic chamber to the stroke is selected as less than 1.55.

Abstract: A pneumatic hammer mechanism is disclosed. The hammer mechanism includes: a flying mass; an impact surface which limits a movement of the flying mass along the impact axis in the impact direction; a hammer piston which limits a movement of the flying mass opposite from the impact direction; a pneumatic chamber between the flying mass and hammer piston; and a drive for periodically moving the hammer piston with a stroke along the impact axis.

Abstract: A vehicle interior decor element, in particular an air bag cover, comprising a front side (36) facing the vehicle interior and an opposite rear side (34), a cover (18) and a decorative element (20) which is provided at the cover (18), is visible from the front and is at least partly translucent. The decorative element (20) includes sections (24) between which the decorative element (20) has a gap (26) through which the cover (18) is accessible from the front side (36). The decorative element (20) extends with at least one portion (44) thereof towards the rear side (34) towards or into a cavity (42) which is formed in the cover (18) and in which an illuminant (50) for illuminating the decorative element (20) is accommodated.

Abstract: A hand-held power tool includes a motor-driven percussion mechanism including a guide tube (21), a reciprocating driving member (22) displaceable in the guide tube (21) for driving, via a gas spring, an impact member (23) likewise displaceable in the guide tube (21) a motor-driven eccentric wheel (17) rotatable about an axis (D) which is spaced from the percussion mechanism axis (S) in a direction perpendicular to the percussion mechanism axis (S) by a distance (X), and a connection rod (29) eccentrically supported on the eccentric wheel (17) and connected to the driving member (22) for converting a rotational movement of the eccentric wheel (17) into a reciprocating movement of the driving member (22).

Abstract: A hand-held power tool includes a percussion power tool includes a percussion piston (5) for applying blows to an anvil (8) axially displaceable in a guide tube (6) within limits defined by two, spaced from each other, stops (9a, 9b) arranged in the guide tube (6), a pneumatic percussion mechanism (2) for driving the percussion piston (5), an air spring (3) for connecting the percussion piston (5) with the percussion mechanism (2), and an impact ring (12) arranged coaxially with the anvil (8) outwardly thereof and having spaced from each other, inner radical flanks (14) located on opposite axial sides of the outer radial collar (11) provided on the anvil (8), with the impact ring (12) freely axially displaceable, within limits, relative to the outer radial collar (11) and having an outer diameter smaller than a guiding inner diameter of the guide tuber (6), and with a mass ratio of the impact ring (12) to the anvil (8) being equal at least 0.25.

Abstract: A gas bag cover for a vehicle occupant restraint system has a plastic cap (12) with a front face (14) and a rear face (16) facing a gas bag (17), and a decorative element (18) provided on the front face (14). The decorative element (18) is welded to the plastic cap (12). Furthermore, a method of manufacturing such a gas bag cover (10) is described.

Abstract: A hand-held power tool has a air spring percussion mechanism which is suitable to provide for generating axial impacts by an impact piston reciprocating along an impact axis and which is driven by a crank pin (4) of a rotatably supported eccentric (5) whose mass distribution with respect to an eccentric axis (E) has an unbalance (U) which is offset in the eccentric plane extending perpendicular to the eccentric axis (E) by an angle of unbalance (?) in the range of 70° to 90° relative to the crank pin (4) which is spaced from the eccentric axis (A) by a distance equal to the crank radius (K).

Abstract: A cup-shaped drill head with an inner conical surface (2) for force-locking connection with an exterior conical surface (3) of a driving drill shaft (4), which at the leading end changes over into a cup base (5) with a center point (P), whereby in the change over from the cup base (5) to the inner conical surface (2) a lesser curvature (K) is present than at the center point (P).