F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
F04D 25/14 (2006.01)
Patent
CA 2267808
A fan for moving air into or out of a building comprises a novel centrifugal mechanism for operating an associated shutter made of a plurality of pivoted vanes and a central vane interconnected by two heavy tie rods, a wall-housing defining a quasi square air flow passage having large radii at each corner, an electric reversible motor and an impeller which are fastened to a central structural member. The centrifugal mechanism is made up of a smaller number of parts and joints required to prevent looseness and vibrations even after long term use and it is connected for rotation to the fan impeller comprising a closed housing wherein are located, symmetrical spaced apart in rapport to the fan axis, at least a pair of radial masses operatively connected via flexible means to an axial hollow operative actuator which is located adjacent to the shutter central vane. When the fan starts to rotate in either direction, each radial mass slides radially outwardly from the axis of rotation of the fan pulling the axial actuator inside the housing allowing the shutter heavy tie rods, by gravity, to open the shutter. When the fan stops, a spring associated with the axial hollow operative actuator pushes it outwardly of the closed housing against the central vane of the shutter causing the closing of the shutter.
Milana Angelo
Na
LandOfFree
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