Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1982-11-23
1985-07-16
Miller, Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307269, 307231, 307360, 307271, 307290, 328115, 328116, 328119, 328135, 328146, 328149, H03K 5153
Patent
active
045298920
ABSTRACT:
Circuitry for discriminating between input signals having peak amplitudes which fall with two ranges includes two Schmitt triggers having their input terminals connected to a common circuit input terminal. The trigger points of the two Schmitt triggers overlap each other. The potential difference between the upper trigger points of the two Schmitt triggers establishes one of the input signal amplitude ranges. Signals with amplitudes greater than the upper trigger point of the higher of the two upper trigger points fall into the second of the two signal ranges. Decoder circuitry coupled to the outputs of the two Schmitt triggers determine if one or both of the Schmitt triggers is regularly responding to the input signal and thereby the relative amplitude range of the applied signal.
REFERENCES:
patent: 3290520 (1966-12-01), Wennik
patent: 3639779 (1972-02-01), Garrigus
patent: 3895237 (1975-07-01), Harr
patent: 3906259 (1975-09-01), Nicholas et al.
patent: 3984703 (1976-10-01), Jorgensen
patent: 4162454 (1979-07-01), Olsen
Gillberg James E.
Reilly Robert J.
Haas George E.
Miller Stanley D.
RCA Corporation
Roseen Richard
Schanzer Henry I.
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