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US 6,890,155 B2Granted
Fan blade
OwnerThomas Cartwrightinventor
Life of this patent
Estimating the term…
Abstract
A fan blade has a three dimensional shape that resembles a leaf. The blade is made of balsa or other suitable wood with the grain of the wood running along its length. The obverse surface of the blade is contoured and has a central vein and lateral veins running from the central vein to opposite edges. The reverse side has one or more channels. Braces are set in the channels. The braces are also made of balsa or comparable wood and their grain runs transverse to the direction of the gain of the blade.
Claims8
A blade for a ceiling fan comprising:
- an elongated member having a shape corresponding to a leaf with a length greater than its width and with a perimeter having opposite sides;
- the elongated member comprising one or more strips of material disposed in the elongated direction;
- the elongated member having an obverse surface with an irregular topology and a reverse surface having a generally planar topology;
- the reverse surface having means for laterally securing the elongated member to prevent separation and fragmentation of the blade.
1 more element
Dependencies are inferred from the claim text.