Patent ID: 6669240
Filing Date: 2003-12-30
Classification: A01D

Abstract:
An unloader tube pivot mechanism, comprising:a pivotal unloader tube, upper and lower unloader tube portions closely adjacent each other and which pivot with respect to each other to allow the unloader tube to pivot, upper and lower pivot bushings fixed for pivotal motion with respective upper and lower unloader tube portions, said upper and lower pivot bushings having bearing surfaces in slidable contact with each other and through which weight from the upper unloader tube portion is transmitted to the lower unloader tube portion, said upper and lower pivot bushings being an ultra high molecular weight material, and mating shapes formed in the upper and lower pivot bushings and the upper and lower unloader tube portions, and said mating shades block the upper and lower pivot bushings from pivoting with respect to the respective upper and lower unloader tube Portions said mating shapes further comprise peg members formed in the pivot bushings and openings formed in the upper and lower unloader tube portions which receive said peg members.