Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – With mounting or supporting means
Patent
1991-07-08
1993-07-20
Johnson, Blair M.
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
With mounting or supporting means
160 1, 160 3, 160133, 200 6143, 318468, 49 26, E05F 1500
Patent
active
052284921
ABSTRACT:
A safety stopping device particularly adapted for use with an electric steel rolling door is disclosed which comprises a transmitter mounted on a base plate of the rolling door and a receiver mounted on and directly connected to the electric motor used for driving the rolling door. In addition, various transmit switches are mounted on the underside of the aforementioned base plate to indicate to the transmitter when an obstruction is encountered. Upon occurring an obstruction, a signal is transmitted to the receiver whereupon the flow of current to the electric motor is interrupted to cause the electric rolling steel door to automatically stop.
REFERENCES:
patent: 2740856 (1956-04-01), Doeg
patent: 3210496 (1965-10-01), Gary
patent: 3462885 (1969-08-01), Miller
patent: 3728605 (1973-04-01), Purtilo
patent: 3828698 (1974-08-01), Delanater et al.
patent: 4115952 (1978-09-01), French
patent: 4564098 (1986-01-01), Hormann
patent: 4944116 (1990-07-01), Mewald
patent: 5027552 (1991-07-01), Miller et al.
patent: 5887205 (1989-12-01), Chou
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