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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||415/146 ; 454/360|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 8 인용 특허 : 1|
This invention relates to a closure for the outlet of a fan. A fan has an outlet opening 12 in a fan case volute 10 which is closed by a hinged flap 13, the weight of the flap being compensated by a counterweight arm 15. When the flap 13 closes opening 12, counterweight arm 15 is latched by latch 32 carried by spring 26 which must deform before the flap can open. Alternatively, the latch 32 is itself a resilient spring. The flap will only open when sufficient static pressure is applied by the fan, and the resilient latch 25, 32 will prevent “flutter”whic...
Closure means for closing an outlet opening of a casing of a fan assembly having a motor driven air flow impeller within the casing, comprising a flap, hinge means hinging the flap to the casing for movement between a normally closed position wherein said flap at least partly closes said outlet opening and an open position wherein there is a free flow of air from said opening, a counterweight arm associated with said flap and hinge means urging said flap towards its normally closed position, and a latch releasably retaining said flap in its closed positi...