Flexible or portable closure – partition – or panel – Automatic control – Nonthermal automatic initiator
Patent
1994-04-01
1996-07-30
Johnson, Blair M.
Flexible or portable closure, partition, or panel
Automatic control
Nonthermal automatic initiator
160133, 160188, 160310, 49 28, 318467, E05F 1520
Patent
active
055402690
ABSTRACT:
The invention relates to a motor-driven roller blind comprising, on the one hand, an apron rolling up onto and unrolling from a winding shaft inside which is accommodated a tubular-type driving gear-motor and, on the other hand, means providing an electrical signal representative of the movement of the apron and an electrical-signal processing unit capable of acting on the running of the driving gear-motor, viz. to control the stopping of same in the event an obstacle is present. As a matter of fact, said means providing an electrical signal representative of the movement of the apron are comprised of at least one inductive sensor extending at least partly along the path followed by the apron, this inductive sensor being capable of creating an electromotive force under the action of the passing of a permanent magnet associated with the lower portion of the apron, which electromotive force is detected by the processing unit.
REFERENCES:
patent: 4651940 (1987-03-01), Nakamura
patent: 4952855 (1990-08-01), Meins et al.
patent: 4953608 (1990-09-01), Larsson
patent: 5164896 (1992-11-01), Nagayasu
patent: 5228492 (1993-07-01), Jou
Johnson Blair M.
Plumer (Societe Anonyme)
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