Elevator travel detecting apparatus

Details Elevator travel detecting apparatus Elevator travel detecting apparatus

1983-01-26

1987-11-03

Weldon, Ulysses

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 300

Patent

active

047045973

ABSTRACT:
An elevator cage travel detector includes an apertured disc 8 whose rotational movement is sensed by a photo encoding pulse generator 9 which produces two phase displaced outputs 10b, 11b. To prevent motion detection errors due to false generations of one of the pulse outputs when the cage is at rest, due to vibrations or the like, each pulse train is fed to both its own flip-flop 14C, 14D and to a leading and trailing edge detector 14A, 14B whose output enables a flip-flop for the other pulse train. The further processing of the two pulse trains is thus mutually dependent upon the continuing generation of both of them.

REFERENCES:
patent: 4102437 (1978-07-01), Mandel
patent: 4218671 (1980-08-01), Lewis
patent: 4232257 (1980-11-01), Harshberger
patent: 4346788 (1982-08-01), Shung
patent: 4426714 (1984-01-01), Ashida

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