Communications: electrical – Systems – Signal box type
Patent
1976-04-19
1977-05-31
Pitts, Harold
Communications: electrical
Systems
Signal box type
340272, 340274R, G08B 2100
Patent
active
040273040
ABSTRACT:
An alarm and a safety capsule includes a booth having a door. A control circuit for the booth includes a switch, for sending an alarm, which is not operative until the booth door is closed, and inhibits closing of the door if attempts are made to operate the button with the door open. A timing circuit responsive to operation of the button prohibits release of the door for a determined period. A further button, energized by the timing circuit, enables an occupant of the booth to unlock the door. The door may also be unlocked by a radio control circuit.
REFERENCES:
patent: 790822 (1905-05-01), Gale
patent: 3886537 (1975-05-01), Mann
patent: 3964057 (1976-06-01), Wells
Diakantonis Tony
Sweatt Warren L.
Pitts Harold
Rosen Daniel M.
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