Patent ID: 7863765

Claim:
A vertical shaft type windmill with arcuate hook shaped vane blades, comprising: a tower having an annular track and a generator chamber respectively provided on the upper and lower parts thereof, a generator and a electric controller being housed in said generator chamber, and a rotary stand with wheels being mounted on said annular track, wherein said tower is used to entrain the whole structural load and conjoin all structural parts; a rotary stand constructed of round type frames with several track wheels annularly disposed beneath to roll around said annular track under said tower; wherein said rotary stand is divided into several steps, each step has more than 10 sets of arcuate hook shaped vane blade assembly bolted one another, and a large speed increaser is screw combined to the foot thereof, said rotary stand accepts the wind force to drive a wind vane assembly so as to transmit the mechanical power produced by rotation of said rotary stand to said large speed increaser underneath; a wind vane assembly composed of several wind vane wheel stacked on top of one another and mounted on said rotary stand, said wind vane wheel being composed of more than 10 sets of said arcuate hook shaped vane blade assemblies, and each said blade assembly having 2 wind vane surfaces making a hook angle about 66Â° with each other to accept the wind power to rotate; wherein the edge of said wind vane surface is configured into an arcuate surface to make an angle of about 20 with the edge of said wind vane wheel so as to eliminate most of the head wind resistance, several wind vane blades are stacked on top of one another to prevent intrusion of the head wind into said wind vane wheel thereby allowing said wind vane wheel to rotate under minimized head wind resistance; a generator accommodated in said generator chamber built under said tower, wherein said generator shaft is coupled with a small speed increaser so as to transmit the mechanical power produced by the rotation of said rotary stand to said large speed increaser beneath and drive said small speed increaser and further drive said generator to generate the electrical power; and an electric controller accommodated in said generator chamber to integrally control the electrical power generated by said generator.