Elevator – industrial lift truck – or stationary lift for vehicle – With barrier for regulating access to load support – Includes motor or motor driven linkage for shifting barrier
Patent
1994-05-26
1996-10-29
Nappi, Robert
Elevator, industrial lift truck, or stationary lift for vehicle
With barrier for regulating access to load support
Includes motor or motor driven linkage for shifting barrier
187392, B66B 1324, B66B 1326
Patent
active
055698883
ABSTRACT:
Ultrasonic waves may be emitted from a transmitter/receiver sonic transducer, or separate transmitter working with a separate receiver, directly or reflected into the opening between doors of an elevator; responses reflected from objects or passengers between the doors which are received within a window of response are utilized to create a door reversal signal. The ultrasonic waves may be shaped into a curtain or sheet by means of a hyperbolic reflector opening downwardly toward the doors. To equalize time of travel for sound waves emanating from a single source on one side to all parts of the door opening, the reflector may also have a parabolic shape. The sound waves may be emitted in a cylindrical pattern to accommodate elevators having circular doors. Multiple reflectors may include a convex reflector to spread the sound waves vertically.
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patent: 5235144 (1993-08-01), Matsui et al.
patent: 5329075 (1994-07-01), Hirabayashi et al.
patent: 5447211 (1995-09-01), Sors
Kamani Sanjay
Salmon John K.
Nappi Robert
Otis Elevator Company
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