Variable pitch fan

Claim 1

A VARIABLE PITCH FAN FOR DRIVING A ROTARY MECHANISM COMPRISING A BODY PLATE HAVING A HUB FOR A SHAFT, A PLURALITY OF SEMI-CYLINDRICAL RECESSES IN SAID PLATE RADIAL TO SAID HUB, A PLURALITY OF BOLTS PARALLEL WITH THE AXIS OF SAID HUB PASSING THROUGH SAID BODY PLATE, A SADDLE PLATE MOUNTED ON SAID BOLTS AND HAVING SEMI-CYLINDRICAL RECESSES MATING WITH SAID FIRST RECESSES TO FORM CYLINDRICAL BORES, FAN BLADES HAVING CYLINDRICAL SHANKS IN SAID BORES, PINS ON SAID SHANKS RADIAL TO SAID SHANKS, SAID SADDLE PLATE HAVING OPENINGS FOR SAID PINS, A SECOND PLURALITY OF BOLTS PARALLEL WITH THE AXIS OF SAID HUB AND PASSING THROUGH SAID BODY AND SADDLE PLATES, A ROTATABLE PITCH PLATE ADJACENT SAID SADDLE PLATE HAVING ARCUATE SLOTS FOR MOUNTING THE PITCH PLATE FOR LIMITED ROTATION ON SAID LAST BOLTS, SAID PITCH PLATE HAVING NOTCHES IN ITS EDGE PORTIONS ENGAGING THE PINS OF ALL OF SAID BLADE SHANKS AND ARRANGED TO CHANGE THE PITCH OF ALL THE BLADES IN UNISON, NUTS ON SAID FIRST PLURALITY OF BOLTS FOR CLAMPING SAID BODY AND SADDLE PLATES AGAINST SAID BLADE SHANKS, AND NUTS ON SAID SECOND PLURALITY OF BOLTS TO CLAMP ALL OF SAID PLATES TOGETHER AND PREVENT ROTATION OF SAID PITCH PLATE RELATIVE TO SAID BODY AND SADDLE PLATES.