Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1978-06-12
1980-06-03
Rubinson, Gene Z.
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
307119, 361179, H02P 104
Patent
active
042063906
ABSTRACT:
The control includes approach and safety mat switches to which are applied alternating current voltage. Each of the switches are coupled to respective high gain binary output, solid-state amplifiers which change state upon alternation of two different input voltages being compared. Upon closure of the approach mat switch, the corresponding binary amplifier is caused to change state which in turn changes the state and output signal of a third like amplifier. This output signal causes the energization of an electric motor which opens the door. Opening of the approach mat switch followed by closing of the safety mat switch, the corresponding amplifier changes state and holds the third amplifier in its state which causes energization of said motor, thereby holding the door open. A time delay circuit is connected to the third amplifier for delaying the change of state of the third amplifier after the approach and safety mat switches are opened.
To safeguard against the door being opened when the safety mat is stepped on first, an inhibit signal is coupled from the safety mat circuit to the approach mat circuit, disabling the latter.
REFERENCES:
patent: 3651332 (1972-03-01), Cochran
patent: 3662229 (1972-05-01), Graff et al.
patent: 3891909 (1975-06-01), Newson
Fulling John
Rubinson Gene Z.
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