Pneumatic or hydraulic drive for opening and closing of doors
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United States of America Patent
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Aug 8, 1989
Grant Date -
N/A
app pub date -
Nov 9, 1987
filing date -
Jan 20, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is directed to a penumatic or hydraulic drive for opening and closing of doors, in which the linear motion of a double-acting piston 5 driven by a pressure medium is converted into a rotary motion of a spindle 2 through a piston rod 6 and a helical gear box 3. Herein a blocking lever 10 supported in a stationary manner is provided, which in the closed position of the door engages under the action of a spring 18 at a part 11 connected with a piston 5, wherein said blocking lever secures the piston in its end position and is held in its open position counter to the force of an additional spring 15 by a power cylinder 14 acted upon by the pressure means.
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