Ventilation – Having outlet airway – With air pump
Patent
1990-11-28
1992-04-21
Makay, Albert J.
Ventilation
Having outlet airway
With air pump
454359, 454367, F04D 2514
Patent
active
051057328
ABSTRACT:
A protective cover device for a wall fan includes a shutter assembly having a first ring plate, a second ring plate with a shape similar to that of the first ring plate, and a plurality of arcuate strips provided between the first and second ring plates. The first and second ring plates define a central opening. Each arcuate strip has a shape corresponding to an arc portion of the first and second ring plates. One end of each arcuate strip is connected to the first ring plate. The other end of each arcuate strip is connected to the second ring plate. The arcuate strips are evenly distributed on the first and second ring plates to form an overlapping arrangement between the first and second ring plates. The second ring plate is limitedly rotated to correspondingly move the arcuate strips between an open position, wherein the arcuate strips are concealed between the first and second ring plates, and a closed position, wherein the arcuate strips extend across the central opening to form an annular cover defining a central aperture.
REFERENCES:
patent: 446623 (1891-02-01), Lean
patent: 745313 (1903-12-01), Bate
patent: 1022058 (1912-04-01), Bliss
patent: 2812896 (1957-11-01), Sieradzki
patent: 4094492 (1978-06-01), Beeman et al.
patent: 4232595 (1980-11-01), Cox
patent: 4253384 (1981-03-01), Schmidt et al.
patent: 4407188 (1983-10-01), Thorn
Doerrler William C.
Makay Albert J.
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