초록 ▼

A windmill vane for use with a windmill having a vertical shaft. The vane comprises an open, rigid, planar, preferably semi-elliptical frame and a flexible sail on the frame. The frame can also be chevron shaped or semi-rectangular in shape. One end of the frame is affixed to the shaft, ad the other

A windmill vane for use with a windmill having a vertical shaft. The vane comprises an open, rigid, planar, preferably semi-elliptical frame and a flexible sail on the frame. The frame can also be chevron shaped or semi-rectangular in shape. One end of the frame is affixed to the shaft, ad the other end is aligned therewith horizontally and radially outwardly from the shaft. The planar frame is oriented with a central portion leading the ends thereof relative to the instantaneous direction of movement of the frame around the shaft. The central portion of the frame is inclined at a 45°angle upwardly from the frame ends relative to such instantaneous direction of movement. The sail is light weight, resilient, and preferably carried by a loose sleeve around the frame. The design of the vane ensures that the sail is full when moving with the wind and streams directly behind the frame when moving across and against the wind.

대표청구항 ▼

A windmill vane for use in a windmill having a shaft disposed for rotation by the wind in a selected direction around the longitudinal axis of the shaft, said vane comprising: (a) a rigid, generally open, generally planar frame standing out from and fixedly carried by the shaft, the frame having a c

A windmill vane for use in a windmill having a shaft disposed for rotation by the wind in a selected direction around the longitudinal axis of the shaft, said vane comprising: (a) a rigid, generally open, generally planar frame standing out from and fixedly carried by the shaft, the frame having a central portion and first and second ends, the frame being oriented in a plane with the central portion of the frame leading the ends thereof relative to the instantaneous direction of movement of the frame around the shaft, such plane being inclined at an angle of about forty-five degrees (45°) relative to such instantaneous direction of movement; and (b) a sail comprising a light weight, resilient substantially wind resistant material, the sail extending continuously between (i) a head edge attached along the frame, and (ii) a foot edge extending continuously between the ends of the frame and being otherwise unattached thereto; the orientation of the frame and the length of the foot edge of the sail being such that the sail is full when moving with the wind and streams behind the frame and has minimal drag when moving across and against the wind.