Reversing device for roller doors

Details Reversing device for roller doors Reversing device for roller doors

1982-11-03

1985-02-26

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

49 28, E05F 300, G01D 538

Patent

active

045019630

ABSTRACT:
Briefly, in this invention, a reversing device comprises a rotational wheel or other device in contact with one face of the curtain, which is caused to rotate upon descent of the curtain, and imparts a series of impulses each of which recommences a timing sequence of a timer at normal descent rate, but upon reduction of descent speed (caused for example by an obstruction), the timer times out its entire period and actuates a timer switch and relay circuit which reverses the motor to raise the curtain.

REFERENCES:
patent: 2752150 (1956-06-01), Richmond et al.
patent: 3481387 (1969-12-01), Purdy
patent: 3719005 (1973-03-01), Carli
patent: 3886354 (1975-05-01), Swiden et al.
patent: 3955661 (1976-05-01), Popper et al.
patent: 4365250 (1982-12-01), Matsuoka et al.

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