Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1991-10-31
1993-09-21
Stephan, Steven L.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187105, 187113, 187133, 187134, 307149, B66B 100
Patent
active
052471390
ABSTRACT:
A two-channel forked fail-safe light barrier generates shaft position information in the region of the floors for the premature opening of the doors on arrival of an elevator car and includes a cyclical dynamic self-monitoring circuit by means of which a prophylactic fault recognition is possible. The self-monitoring circuit is responsive to the arrival and standstill of the car at a floor and periodically simulates genuine operational sequences as a brief emergence of the switching vane by an optical short-circuit of the fail-safe light barrier. The simulation effects interruption of the light barrier relay power which is, however, shorter than the release time of the relays so that the relays do not release when the circuit is intact. A sequence of timing signals controls the sequence of the self-monitoring functions and, in the case of any kind of component faults, this sequence is disturbed and a corresponding reaction in the safety circuits of the elevator control takes place by way of the relay contacts. A cyclically appearing test signal is generated as the primary control signal for the simulated interruptions.
REFERENCES:
patent: 3743056 (1973-07-01), Zitelli et al.
patent: 3743058 (1973-07-01), Diamond
patent: 4019606 (1977-04-01), Caputo et al.
patent: 4088900 (1978-05-01), Klopsch et al.
patent: 4362224 (1982-12-01), Fairbrother
patent: 4785914 (1988-11-01), Blain et al.
patent: 4898263 (1990-02-01), Manske et al.
patent: 4977984 (1990-12-01), Arnosti et al.
Kirchner Martin
Schon Rainer
Sprecher Bernhard
Wildisen Daniel
Clemens William J.
Dougherty Thomas M.
Inventio AG
Stephan Steven L.
LandOfFree
Two-channel forked light barrier detecting vertical position does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Two-channel forked light barrier detecting vertical position, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-channel forked light barrier detecting vertical position will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1051994