Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – With mounting or supporting means
Patent
1993-01-29
1994-03-01
Purol, David M.
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
With mounting or supporting means
160310, 74 8921, E05F 1500
Patent
active
052898644
ABSTRACT:
An auxiliary drive unit (30) intended for driving a chain (11) in a horizontal track (12) is arranged to operate only when a forward end (33) of the chain passes a predetermined point. A drive sprocket (16) engages with the chain and initially freewheels until the forward end (33) of the chain contacts a switch (34), actuating a drive motor (13) of the auxiliary drive (30). The drive sprocket (16) is normally "parked" in a precisely orientated position so as to engage the forward end (33) of the chain (11) cleanly. The sprocket (16) has a plurality of circumferentially spaced alternating polarity magnetic poles (22, 23) which park the sprocket (16) precisely in position relative to opposite polarity magnetic poles (27) provided on a fixed member of the auxiliary drive unit. The auxiliary drive unit (30) is particularly designed for driving a rolling shutter (10) suspended from a chain (11) running in a horizontally extending track (12).
REFERENCES:
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patent: 2978019 (1961-04-01), Carlo
patent: 3451463 (1969-06-01), Lyman
patent: 3465805 (1969-09-01), Lyman
patent: 3490514 (1970-01-01), Duncan et al.
patent: 3642049 (1972-02-01), Lyman
patent: 3680622 (1972-08-01), Lester
patent: 3807480 (1974-04-01), Smart
patent: 4754795 (1988-07-01), Garrod
Bolton Brady Ltd.
Purol David M.
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