Lift door apparatus

Details Lift door apparatus Lift door apparatus

1992-09-21

1994-02-08

Dayoan, D. Glenn

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187132, B66B 1300

Patent

active

052842258

ABSTRACT:
Apparatus for controlling a lift door in which a detection zone (10) is illuminated with an infrared light source (15) and reflected light is received by image sensing device (18). A data processing device (17) is programmed to analyse video information stored in a video memory (22) and a reference field memory (23) so as to distinguish an object approaching the lift doors (1, 2) from an object passing by the lift, and also distinguishes stationary objects in the path of the lift doors (1, 2) from background objects. In a preferred embodiment, a low resolution image sensing device (18) is used and video information is binned and stored in the video memory (22).

REFERENCES:
patent: 4951786 (1990-08-01), Haraguchi
patent: 4976337 (1990-12-01), Trett

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