Ventilating fans

Details Ventilating fans Ventilating fans

1978-12-27

1980-08-19

Capossela, Ronald C.

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Plural distributing means immediately upstream of runner

98 40V, 98 94AC, 415125, F04D 2508, F04D 2514

Patent

active

042178169

ABSTRACT:
The ventilating fan is comprised of a centrifugal governor which is driven by the fan impeller for causing a plurality of simultaneously operable pivotable louvers, which are supported by the fan casing, to move to their open position during fan operation. When the fan impeller is stopped, a spring which is interposed between the louvers and the casing caused the louvers to return to their closed position.

REFERENCES:
patent: 2196308 (1940-04-01), Johnston
patent: 3004485 (1961-10-01), Bristol
patent: 3064548 (1962-11-01), Field
patent: 4007673 (1977-02-01), Zaloga

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