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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0973775 (1978-12-27) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 11 인용 특허 : 1 |
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
A tubed axial ventilating fan, comprising a casing which defines an air flow passage having an air flow inlet and an air flow outlet, an electrically driven fan impeller, said fan impeller being carried by an impeller shaft which is rotatably mounted within said casing, a plurality of simultaneously
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