1981-03-17
1982-12-28
Tapolcai, William E.
98121A, F24F 1308
Patent
active
043655424
ABSTRACT:
An electric fan having a rotary grille provided with a plurality of inclined grille plates and a small-sized reversibly rotatable synchronous electric motor adapted to rotatively drive the rotary grille. A plurality of pairs of projections are formed on a peripheral portion of the rotary grille at different distances from the center of the rotary grille and at different angular intervals. A slidable stopper is mounted on the frame of the electric fan. The stopper is adjustably positionable so as to enable engagement with selected one of the pairs of projections or to a position where it does not contact the projections, so that the rotary grille is reciprocatingly rotated within an angular range limited by the projections or rotated continuously in one direction to vary the area or region of application of an air flow.
REFERENCES:
patent: 2759411 (1956-08-01), Jenson
patent: 3213301 (1965-10-01), Jepson et al.
patent: 3380372 (1968-04-01), Perry
patent: 3481534 (1969-12-01), Price
patent: 3777650 (1973-12-01), Wenig
patent: 4123197 (1978-10-01), Keem et al.
Goto Koichi
Kinoshita Hiroshi
Tatsumi Akira
Watanabe Ken'ichi
Hitachi , Ltd.
Tapolcai William E.
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