Abstract:
Pneumatic or hydraulic drive for opening and closing doors, in which the rectilinear movement of a twin-action piston (5) actuated by a pressurized medium is converted into a rotary movement around a shaft (2) by means of a piston rod and a screw drive unit (3). A locking lever (10) mounted in a fixed position acts, under the effect of a spring (18), on a part (11) connected to the piston (5). The lever secures the piston in its end-of-travel position and is held in its open position against the force of another spring (15) by means of a hydraulic jack (14) actuated by a pressurized medium.
Abstract:
In a rotary drive, particularly for vehicle doors, the piston stroke of a piston-cylinder unit (5) is converted into a rotary motion by pairs of cylinders (14) which engage inclined slots (10, 11). The inclined slots are formed in cylinders (4, 6) coaxially arranged into each other, one of the cylinders being connected to the output shaft (7). The slots are axially orientated at their ends. The cover (2) of a pot-shaped housing (1) traversed by the output shaft (7) is provided with a collar (15) which projects outwardly and which surrounds the output shaft. The output shaft (7) is surrounded by a seal (17) of which the envelope (18) covers the outer side of the collar (15) and of which the edge (19) sealingly bears against the cover (2). The cover is provided on its side opposite to the collar with an axial groove (20) wherein the edge of the pot-shaped housing (1) is sealingly engaged.
Abstract:
The invention relates to a tension wave strainer with a strainer lining secured to rods (3, 4) running across or along the direction of the strainer, wherein adjacent rods vibrate in relation to one another in such a way that the strainer lining is alternately relaxed and tensioned. According to the invention, a plastic fabric, e.g. polyamide (nylon), is used as is known for filtering liquids in process technology. In one embodiment, the tension wave strainer consists of two strainer frames (1, 2) and the rods (3, 4) are fitted alternately in the two frames (1, 2). To increase the vibration frequency of the rods (3, 4), the two frames (1, 2) are interconnected via springs (5) and the vibration exciter is an electromagnetic exciter (7) fitted between the two frames (1, 2).