Patent ID: 11933271
Assignee: nan
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 6:
7. A blade structure for use with a vertical axis windmill turbine, comprising:
a blade support structure;
a plurality of vanes located on the blade support structure, the plurality of vanes rotating between an open position and a closed position responsive to a wind force, wherein an angle between the open position and the closed position comprises approximately 180°;
a plurality of hinges, each of the hinges connecting a vane of the plurality of vanes to a blade of a plurality of blades, wherein the plurality of hinges have a biasing force applied thereto to slow movement of the connected vane when approaching 0° and 180°; and
a plurality of bar stop leaf springs associated with each of the plurality of blades to prevent the vane from moving past approximately 0° and approximately 180°.