Rotatable vent
A wind powered rotatable vent includes an annular rotatable louvered panel axially rotatable about a shaft and an impeller disposed in spaced underlying relationship with respect to the rotatable louvered panel and rotatably secured to the shaft. A fixed collar underlies at least a portion of the rotatable louvered panel and a brace which is rotatably secured to the shaft has first arms secured to an upper portion of the rotatable louvered panel and second arms secured to a lower portion thereof. The collar and rotatable louvered panel define a passageway for flow of air therethrough. The rotatable louvered panel is structured to rotate responsive to wind impinging thereon and responsive to air flowing upwardly through the impeller in the passageway.
1. A rotatable vent comprising
an annular rotatable louvered panel,
an elongated shaft extending axially through said rotatable louvered panel,
said rotatable louvered panel being rotatably secured to said shaft,
an impeller rotatably secured to said shaft and disposed in spaced underlying relationship with respect to said rotatable louvered panel,
a fixed collar having at least a portion underlying said rotatable louvered panel,
a brace rotatably secured to said shaft and having a plurality of arms secured to said rotatable louvered panel, and
said plurality of arms having first arms secured to an upper portion of said rotatable louvered panel and second arms secured to a lower portion of said rotatable louvered panel.
2. The rotatable vent of claim 1 including
said rotatable louvered panel having a top louver cover and a bottom louver cover.
3. The rotatable vent of claim 2 including
said first arms extending generally upwardly and being secured to said top louver cover.
4. The rotatable vent of claim 3 including
said second arms extending generally downwardly and being secured to said bottom louver cover.
5. The rotatable vent of claim 2 including
said top louver cover being generally annular, and
said bottom louver cover being generally annular.
6. The rotatable vent of claim 2 including
a cap overlying said top louver cover.
7. The rotatable vent of claim 6 including
said cap being disposed in overlying relationship with respect to said top louver cover.
8. The rotatable vent of claim 7 including
said cap having a peripheral edge which extends generally outwardly and downwardly to resist entry of precipitation into said rotatable louvered panel through said top louver cover.
9. The rotatable vent of claim 1 including
said impeller having a hub and a radially outwardly spaced ring and a plurality of blades extending generally radially therebetween.
10. The rotatable vent of claim 9 including
said blades being angularly offset from a perpendicular orientation with respect to said hub.
11. The rotatable vent of claim 10 including
said collar having a brace including a hub fixedly secured to said shaft and a plurality of arms extending toward and secured to said collar.
12. The rotatable vent of claim 7 including
an annular weathershield disposed under said bottom louver cover and extending radially outwardly therebeyond.
13. The rotatable vent of claim 12 including
a base underlying said collar.
14. The rotatable vent of claim 13 including
said elongated shaft being fixedly secured to said base.
15. The rotatable vent of claim 2 including
said top louver cover having an integrally formed weathershield.
16. The rotatable vent of claim 2 including
said bottom louver cover having an integrally formed weathershield.
17. The rotatable vent of claim 1 including
said rotatable louvered panel being structured to rotate axially responsive to external application of wind or flow of air through said passageway.
18. The rotatable vent of claim 1 including
said impeller being structured to urge air upwardly through said passageway and into said rotatable louvered panel.
19. The rotatable vent of claim 18 including
said rotatable louvered panel having an external diameter to height ratio of about 2 to 5.
20. The rotatable vent of claim 10 including
said collar being fixedly secured to said shaft.
21. The rotatable vent of claim 1 including
said louvers being composed of metal.
22. The rotatable vent of claim 1 including
said impeller being composed of a resinous plastic material.
23. The rotatable vent of claim 1 including
said vent being structured to provide static ventilation when said rotatable louvered panel and said impeller are not rotating.
24. The rotatable vent of claim 1 including
said vent being a roof ventilator.
25. The rotatable vent of claim 1 including
said rotatable louvered panel having a diameter greater than its height.
26. The rotatable vent of claim 1 including
said rotatable louvered panel having an external diameter greater than the external diameter of said collar.
27. A rotatable vent comprising
an annular rotatable louvered panel,
an elongated shaft extending axially through said rotatable louvered panel,
said rotatable louvered panel being rotatably secured to said shaft,
an impeller rotatably secured to said shaft and disposed in spaced underlying relationship with respect to said rotatable louvered panel,
a fixed collar having at least a portion underlying said rotatable louvered panel,
a brace rotatably secured to said shaft and having a plurality of arms secured to said rotatable louvered panel,
said rotatable louvered panel and said collar cooperating to define an air flow passageway, and
said louvers being generally vertically oriented on said rotatable louver panel, whereby air moving through said passageway can exit through said louvers.