Flexible or portable closure – partition – or panel – Roll type – With rotating means
Patent
1996-12-23
1998-09-01
Johnson, Blair
Flexible or portable closure, partition, or panel
Roll type
With rotating means
160291, 192 561, 192 71, A47G 502
Patent
active
057997160
ABSTRACT:
An electric-powered shutter apparatus to be mounted to a building. A winding drum (4) of an electric-powered shutter device (1) is provided with a driving mechanism including an electric motor (7) and a single-directional rotary clutch device (8). A balance tension device (9) is provided at the other end of the apparatus. The clutch device (8) is configured to slip when the load of the rotation in the direction of the curtain being fed exceeds a certain load. Further, the load at which the clutch device (8) slips is set so as to be greater than the force for forcibly rotating the electric motor when disconnected from electric power. The balancing tension device (9) is balanced against the sum of the weight of the shutter curtain (2) and the load for forcibly rotating the electric motor (7). Thus, the need for a braking device for the electric-powered shutter apparatus to be mounted to a building is eliminated.
REFERENCES:
patent: 2637987 (1953-05-01), Hill et al.
patent: 2930212 (1960-03-01), Walterscheid-Muller et al.
patent: 3731773 (1973-05-01), Austin et al.
patent: 4766641 (1988-08-01), Daglow
Hosoyama Kenji
Koyano Akira
Sasaki Tadashi
Yamaguchi Kenji
Johnson Blair
Sanwa Shutter Corporation
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