Power plants – Pressure fluid source and motor – Apparatus having means responsive to or ameliorating the...
Patent
1981-01-28
1984-10-16
Walton, George L.
Power plants
Pressure fluid source and motor
Apparatus having means responsive to or ameliorating the...
60405, 60428, 49 26, 49118, 49360, 91 5, 91 6, 91 32, 91 44, 91 45, 91217, 251 14, 251 28, F15B 1500, F15B 1526, F16K 31122
Patent
active
044766785
ABSTRACT:
The control mechanism is for pneumatic apparatus of the kind comprising a piston-and-cylinder motor coupled between two relatively-movable parts (such as door-leaves) for driving them, when energized, to a predetermined relative position. A pilot valve is actuated when required to switch the apparatus to an emergency mode by isolating the motor from its power source and discharging it into an emergency reservoir having a volume large compared with the maximum volume of gas in the motor. While the pilot valve is actuated, the relatively-movable parts are urged towards their predetermined relative positions by a force small compared with the normal operating force. The pilot valve may be arranged to operate operation of an emergency release bolt, on obstruction detected by a detector valve (in which case a timing reservoir provides time delay before full power is restored), on power failure, or as required.
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PLC Peters Limited
Walton George L.
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