Interlinked variable-pitch blades for windmills and turbines

Details Interlinked variable-pitch blades for windmills and turbines Interlinked variable-pitch blades for windmills and turbines

1980-06-02

1981-11-10

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Sustained ancillary movement of rotary working member

Responsive to gravity or working fluid force

416108, 416132B, F03D 706

Patent

active

042995370

ABSTRACT:
Disclosed herein is a windmill comprising a vertical shaft mounted for rotation about its longitudinal axis, a number of blades each pivotally mounted for angular orientation about a longitudinal axis disposed parallel to the axis of rotation of the vertical shaft, supporting arms extending radially outwardly from the vertical shaft for supporting each blade, and interconnecting links connecting each of the blades to a junction adjacent the vertical shaft longitudinal axis for controlling the angular orientation of the blades relative to the supporting arms. The interconnecting links have inner ends connected to the junction and connect the blades together at corresponding points so that the blades counterbalance each other to resist centrifugal force during rotation of the windmill. A control or spring arrangement in the form of a rod is connected to the main shaft and to the junction of the links for allowing and controlling displacement of the junction to allow pivoting of the blades due to the force of the wind, the instantaneous pitch angles of all the blades being interdependent.

REFERENCES:
patent: 622115 (1899-03-01), Carlson
patent: 1139103 (1915-05-01), Clade
patent: 1190630 (1916-07-01), Clade
patent: 1535585 (1925-04-01), Dyer
patent: 4052134 (1977-10-01), Rumsey
patent: 4180367 (1979-12-01), Drees

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