BELT DRIVE ASSEMBLY

摘要

This disclosure deals with a belt drive assembly for use in suction cleaner. The assembly includes a drive pulley connected to be driven by a drive motor, a driven pulley connected to a rotatable brush roll, and a belt connecting the two pulleys. The outer surface of the driven pulley is divided into high friction portions and low friction portions, the belt exerting a tractive effort only on the high friction portions. The high and low friction portions are proportioned to obtain a driving relationship with the belt under normal load conditions on the brush roll but to slip under overload conditions.