Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1976-11-16
1978-01-10
Heyman, John S.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307251, 307282, 307311, 328151, H03K 1778
Patent
active
040681351
ABSTRACT:
A signal isolating and sampling circuit using a transformer to isolate a signal input circuit from a signal output circuit. Signal sampling switches are used in the input and output circuits to sample an input signal applied to the input circuit. A photocoupler is provided for coupling a switch selecting signal to the sampling switch in the input circuit while an energizing signal for driving the sampling switch in the input circuit is supplied through the transformer from an energizing signal source connected to the signal output circuit. The energizing signal is rectified in the signal input circuit and used to drive the signal input circuit sampling switch under control of the switch selecting signal.
REFERENCES:
patent: 3467836 (1969-09-01), Thomas
patent: 3789244 (1974-01-01), Provanzand
patent: 3818235 (1974-06-01), Johnson et al.
patent: 3867580 (1975-02-01), Russell
patent: 3917963 (1975-11-01), Wadlington
patent: 3940634 (1976-02-01), Grogan
Onoki Seiji
Sonobe Tadashi
Burton Lockwood D.
Halista Mitchell J.
Heyman John S.
Honeywell Inc.
Marhoefer Laurence J.
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