Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1991-06-24
1994-02-01
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, 187130, G08B 2100
Patent
active
052834000
ABSTRACT:
There is provided an elevator shaftway intrusion detector which utilizes a proximity detector including an energy source for generating a detection field within a zone of detection including the elevator shaft-side roof and floor and a corresponding receiver for receiving the detection field when an object enters the detection zone and thereafter generating a detection signal. A power supply and switching network are employed for applying power from the power supply to the proximity detector and which are responsive to the detection signal for applying power from the power supply to a detection indicator such as a siren.
REFERENCES:
patent: 3461422 (1969-08-01), Hansen
patent: 4067416 (1978-01-01), Lowry
patent: 4092636 (1978-05-01), Shepard
patent: 4460066 (1984-07-01), Ohta
patent: 4839631 (1989-06-01), Tsuji
patent: 5025895 (1991-06-01), Leone et al.
Brochhagan Thomas
Cummins Robert F.
Leone Richard J.
Vitiello Joseph
Nappi Robert
Stephan Steven L.
TOC Holding Company of New York, Inc.
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