Patent ID: 6929574

Claim:
A shiftable two-speed drive for a crop residue chopper of an agricultural combine, comprising: a first drive pulley connected in rotatably driven relation to a rotatable power source on the combine, a shaft adjacent to the chopper rotatable about an axis therethrough including a first driven pulley mounted on the shaft for rotation therewith, and an endless belt encircling the first drive and driven pulleys; a second drive pulley connected in rotatably driven relation to the rotatable power source on the combine for rotation therewith, a tube concentric with the shaft and rotatable around the shaft and the axis, the tube being rotatable for rotating the chopper, and the tube including a shift hub mounted around a portion thereof for rotation therewith, the shift hub supporting a second drive pulley in axially spaced relation to the first driven pulley for concentric rotation about the shift hub, and an endless belt encircling the second drive and driven pulleys; and a shift collar mounted around the shift hub in the space between the first driven pulley and the second driven pulley for rotation with the shift hub and for axial movement relative thereto between a position adjacent the first driven pulley and a position adjacent the second pulley, the collar and the first driven pulley including elements cooperatively engageable when the collar is in the position adjacent to the first driven pulley for connecting the collar to the first driven pulley for rotation of the collar, the shift hub and the tube therewith, and the collar and the second driven pulley including elements cooperatively engageable when the collar is in the position adjacent to the second driven pulley for connecting the collar to the second driven pulley for rotation of the collar, the shift hub, and the tube therewith.