Windmill
A windmill is described comprising: (a) a rotatable, vertical shaft; (b) hub surrounding at least a portion of the shaft and closely spaced therefrom, the hub being secured to the shaft and rotating therewith; (c) at least one row of vanes secured to the hub, each row having four vanes uniformly spaced circumferentially; (d) each of the vanes comprising: (1) a vertically extending cylindrically curved surface for collecting the wind, the curved surface having a convex side and a concave side; (2) a thin vertically extending flange along the inner edge of the cylindrically curved surface, the flange having the same curvature as the hub and providing a surface for attachment of the vane to the hub; (3) means for attaching the vane to the hub via the flange; (4) vertical ribs extending from the top to the bottom of the curved surface on the concave side therof and intersecting the curved surface at right angles; (5) a substantially tangential flat vertical end strip intersecting the outer edge of the curved surface at an obtuse angle and extending rearwardly from the curved surface; and (6) a pair of horizontal end plates secured to the curved surfaces at the upper and lower ends, respectively, thereof. Each of the end plates has a convex curved leading edge at the intersection with the curved surface, and a straight trailing edge extending from the hub to the end strip. The trailing edge is parallel to a radius of the windmill and forwardly offset therefrom, (e) the curved surfaces of all of the vanes being oriented in the same direction of rotation.
- Assignee:
- NOV; NOV-87-052219; EDB-87-071295
- Patent Number(s):
- US 4650403
- OSTI ID:
- 6684291
- Resource Relation:
- Patent File Date: Filed date 6 Mar 1986
- Country of Publication:
- United States
- Language:
- English
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