Fluid controlled security lock

Details Fluid controlled security lock Fluid controlled security lock

1976-03-01

1977-07-05

Frazier, Roy D.

Locks

Operating mechanism

Using a powered device

70DIG48, E05B 5102

Patent

active

040331610

ABSTRACT:
A fluidic logic circuit is used to control access to a secured area by receiving pneumatic signals from a fluidic signal input transducer determining whether or not specific coded input requirements have been met. When all inputs to the signal input transducer are correct the fluidic logic circuit applies fluidic signals to valving which in turn provides fluid power to pneumatically operated latching devices. When one or more incorrect inputs from the signal input transducer are received by the fluidic logic, a dual signal is initiated by the fluidic logic which shuts off the power supply valve and prevents opening of the pneumatic latch.

REFERENCES:
patent: 3182676 (1965-05-01), Bauer
patent: 3320490 (1967-05-01), Beck et al.
patent: 3416550 (1968-12-01), Griffin
patent: 3495776 (1970-02-01), O'Neill
patent: 3633392 (1972-01-01), Bell et al.
patent: 3812403 (1974-05-01), Gartner
patent: 3879970 (1975-04-01), Salzmann et al.
patent: 3942151 (1976-03-01), Takeuchi

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