Motors: expansible chamber type – Independently operated timer – delay – pattern or cyclic control – Of independently movable working members
Patent
1986-02-05
1988-02-09
Garrett, Robert E.
Motors: expansible chamber type
Independently operated timer, delay, pattern or cyclic control
Of independently movable working members
91361, 91365, 91534, 251 29, F15B 2102, F15B 1316
Patent
active
047234741
ABSTRACT:
A pneumatic control system for a reversible stepping actuator has an analog pneumatic control signal and an analog signal indicative of actual position of the actuator. Imbalance in these signals opens one or the other of a pair of comparator valves having inlets connected to a source of pneumatic pressure. Opening of either of the comparator valves enables a pulse timer which converts the pneumatic pressure from either of the comparator valves to pulses of pneumatic pressure applied to one or the other of the operators of the reversible stepping actuator. An oscillating pneumatic timer may be used to produce the pressure pulses, or an electric timer can be used to "chop" one of the pneumatic pressures into periodic pulses.
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"Kuhnke Pneumatics", Catalog 1000, H. Kuhnke, Inc., p. 3.
Garrett Robert E.
Smith International Inc.
Williamson Mark A.
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