Safety system for detecting small objects approaching closing do

Details Safety system for detecting small objects approaching closing do Safety system for detecting small objects approaching closing do

1997-06-23

1999-07-20

Noland, Kenneth

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

49 25, B66B 1326

Patent

active

059258586

ABSTRACT:
A safety system for detecting small objects that approach closing doors comprising a transmitter stack, a detector stack, and a controller including instructions to detect small objects as the doors are closing. A transmitter or a group of transmitters from the transmitter stack are powered sequentially resulting in an output from the detector stack. The controller compares each output from the detector stack with an average of all the outputs plus a threshold value. The outputs that exceed the average plus threshold value trigger the safety system to reverse closing operation of the doors.

REFERENCES:
patent: Re30719 (1981-08-01), Mills
patent: 3852592 (1974-12-01), Scoville et al.
patent: 4029176 (1977-06-01), Mills
patent: 4706227 (1987-11-01), DuVall et al.
patent: 4794248 (1988-12-01), Gray
patent: 4894952 (1990-01-01), Trett et al.
patent: 5142152 (1992-08-01), Boiucaner

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