Abstract: A pneumatic impact tool and method includes a cylinder pipe or housing closed with a cover, as well as an impact piston that forms a first pressure chamber between an impact plate and the impact piston, and a second pressure chamber between the cover and the impact piston. The cover is provided with at least one opening, the surface of which is smaller than the piston surface, whereby the impact piston seals the opening when it is in its fully retracted position.

Abstract: An oscillatory drive unit for use in an oscillating system to be oscillated substantially at the resonance point of the oscillating system, wherein the oscillating system includes a mass to be oscillated and a countermass to which the mass is connected by resilient coupling members. The oscillatory drive unit includes a piston-cylinder-component that is operatively connected to the mass and the countermass. The piston-cylinder-component includes a cylinder chamber and a piston. The piston is arranged for reciprocal movement between a first end position and a second end position. Gas is introduced under pressure into the cylinder chamber within an energizing range of piston positions defined by a first energizing position and a second energizing position of the piston, and gas is vented from the chamber within a venting range of piston positions defined by a first venting position and a second venting position of the piston.

Abstract: An oscillatory drive unit for use in an oscillating system to be oscillated substantially at the resonance point of the oscillating system, wherein the oscillating system includes a mass to be oscillated and a countermass to which the mass is connected by resilient coupling members. The oscillatory drive unit includes a piston-cylinder-component that is operatively connected to the mass and the countermass. The piston-cylinder-component includes a cylinder chamber and a piston. The piston is arranged for reciprocal movement between a first end position and a second end position. Gas is introduced under pressure into the cylinder chamber within an energizing range of piston positions defined by a first energizing position and a second energizing position of the piston, and gas is vented from the chamber within a venting range of piston positions defined by a first venting position and a second venting position of the piston.

Abstract: Pneumatic beater, the beating piston (18) of which is conducted in a movable fashion inside a housing (2) and can be pre-stressed on one side of the piston (18) by means of a pressurizing space (40) against the restoring force of a pressure spring (26) which is provided in a spring space (28) on the other side of the piston (18) inside the housing (2), and in which the connecting channel (42) for the compressed air from the pressurizing space (40) into the spring space (28), which channel can be freed by means of an automatic, quick-acting ventilation valve (48), is conducted directly through the piston (18). Inside the spring space, the channel (42) is extended by means of a pipe (34) which contains the valve arrangement (48). In a first form of implementation, the pipe (34) is solidly affixed to the housing and extends into a bore (30) in the piston, which is conducted over the pipe (34) in a sliding fashion.

Abstract: An electric motor-driven unbalanced vibration generator with an electric motor which is enclosed in a motor housing and the extended motor shaft of which is provided with at least one unbalanced body which can rotate and which is provided in a region which lies radially outside of a radial segment of the unbalanced body, with an additional segment which extends over the motor housing and which can rotate around it. The axial segment of the unbalanced body represents the critical part of the unbalanced mass. As a result of the axial extension of the unbalanced body over the motor housing, and thus the shifting of the center of mass of the unbalanced mass to between the bearings of the motor, a second unbalanced mass at the other end of the motor is no longer necessary. In addition, as a result of the outside radial position of the main segment of the unbalanced body, the unbalanced mass can easily be changed by means of additional masses which can be inserted into the segment and removed from it.

Abstract: A vibrating table for compaction of a mass such as concrete. The vibrating table includes a table top adapted to support the mass to be compacted. Support members support the table top above a floor and provide the table top with two degrees of freedom of movement in a principal plane which is substantially horizontal. The support members rigidly support the table top against movement in a generally vertical direction. An excitation shaft is coupled to the table top and has an axis of rotation which is generally perpendicular to the horizontal principal plane. The excitation shaft includes an unbalanced mass for the creation of an excitation force which provides movement of the table top in the horizontal principal plane.

Abstract: The invention relates to a piston vibrator comprising a case with at least one cylindrical bore (5), at least one air connection (7) taken laterally to the bore (5), and a piston (2) longitudinally displaceable in the bore (5). As a means of making such a vibrator more efficient with a given outside diameter, or as a means of making it more compact and smaller with the same degree of efficiency, the invention proposes that the cylindrical bore (5) should extend asymmetrically to the external wall area (6) of the case, at least at the axial level of the air connection (7).

Abstract: A pneumatic knocking device comprising an elongate housing (1) in which a spring (9) and a top wall (20) with hole (10) are disposed, further comprising a cover (3) with connecting hole (8), a piston (2) movable towards the cover (3) by means of compressed air against the pressure of the spring (9), and a quick-acting vent valve (3, 8, 11, 15) which is disposed in the region of the cover (3) and which vents the chamber (22) beneath the piston (2) into the spring chamber (13) by means of an air conduit (14) is described and is characterized in that the air conduit (14) is in the form of an air passage which is integrated in the housing, that the top wall (20) is in one piece with the housing (1), the cover (3) forms a valve chamber (15) and is provided with a valve bore (21) in which a control diaphragm (11) is movably disposed in such a way that it can bear against the hole (10) in the top wall (20) and close same, and that the chamber (22) beneath the piston (2) is open outwardly.

Abstract: Described is a pneumatic knocking device for knocking dust off bunker walls, comprising a housing (1) which encloses an elongate spring chamber (13) with spring (9), having a vent bore (7), and which is closed at one end by a top wall (20) with hole (10), a valve wall (3) with connecting hole (8), a piston (2) which is movable towards the top wall (20) by means of compressed air against the pressure of the spring (9), and a quick-acting vent valve (3, 8, 10, 11, 14a, 15) which is disposed in the region of the valve wall (3) and which vents the chamber (22) beneath the piston (2) into the spring chamber (13) by means of an air conduit (14).