Patent ID: 7059982
Filing Date: 2006-06-13
Classification: A01D,A01F,F16H

Abstract:
1. A power transmission device for utility machinery, the transmission device including: a) a sleeve supporting a first sheave member having a first face; b) a hub received through said sleeve and moveable axially in relation thereto, said hub supporting a second sheave member having a second face that opposes said first face such that said first and second faces define therebetween a groove adapted to receive a belt and relative axial movement between said sleeve and said hub being adapted to vary at least one of pitch diameter and grip imparted to said belt from said sheaves; and c) an actuator mechanism adapted, through control of relative axial displacement between said sleeve and said hub, to vary at least one of said pitch and grip, said actuator mechanism comprising a control rod disposed substantially perpendicularly to the line of action of said axial displacement and connected to said hub through a link mechanism, said control rod being adapted to move and said link mechanism being adapted to translate movement of said control rod into relative axial displacement of said hub, wherein said link mechanism includes a threaded boss and said control rod comprises a threaded portion that is engaged in use with said boss and adapted to translate rotation of said control rod into linear displacement of said boss along said control rod.