Patent ID: 7120961

Claim:
A self compensating brush wear adjustment system for a rotary brush on a street sweeper configured to maintain a predetermined sweeping efficiency regardless of brush wear, wherein the axle of the rotary brush is carried by opposing pivoted support arms, the brush wear adjustment system comprising: a. a mounting surface located on the street sweeper; b. a lever arm rotatably mounted to the mounting surface; c. a return element urging the lever arm to a starting position; d. a linkage connecting the lever arm to at least one of said pivoted support arm carrying the rotary brush; e. a position sensor responsive to said lever arm, configured to determine the diameter of the brush; f a controller configured to receive a signal from the position sensor and to control the rotational speed of a motor mechanism to regulate the rotation rate of the rotary brush to maintain the cleaning efficiency of the rotation speed of the brush by maintaining the brush's tip speed as the diameter of the brush decreases.