Vacuum cleaner tool having a two-position rotary brush

In a vacuum cleaner tool having a housing, a rotary brush extending therefrom, and drive means for rotating said brush, said drive means including a motor and a drive belt coupling said motor to said brush, wherein said brush has an axle through the center thereof about which said brush rotates, the improvement comprising:

• end cap means fixed to the axle of said brush wherein the axis of said axle is positioned a predetermined distance X and a predetermined distance Y from the center of said mounting portion of said end cap means, wherein X and Y are perpendicular to each other and wherein X=Y tan .theta., where .theta. is the angle between the center line of said end cap means and the line passing through the center of said end cap means and the point defined by X and Y, wherein said brush has a center bore extending along the axis thereof, said axle being positioned in said center bore and extending therefrom, a second bore coaxial with said center bore, said second bore extending only partially into said brush, and a third bore coaxial with said center bore and extending only partially into said brush, and wherein bearing means are mounted in said brush in said second bore thereof for supporting said brush on said axle, said bearing means includes a flange at one end thereof, said flange being positioned in said third bore and engaging the inner face of said third bore.

In a cleaning tool having a housing provided with a protruding brush rotating on an axle and further having a belt connecting the brush to a driving pulley, the improvement in adjustable mounting means for the brush, thereby providing for a height adjustment of the brush with respect to the tool housing, which comprises:

• the mounting means having a center, the axle having first and second respective positions which are each eccentric with respect to the center of the mounting means, means for shifting the axle circumferentially by substantially 180 degrees from its first eccentric position into its second eccentric position, and vice versa, and wherein the driving pulley has an axis disposed on a line which passes substantially through the center of the mounting means and which is substantially perpendicular to a line connecting the first and second eccentric positions of the axle, whereby the distance between the pulley axis and the brush axle remains substantially constant as the axle is shifted from its first eccentric position into its second eccentric position, and vice-versa, thereby assuring that the tension on the belt remains substantially constant regardless of an adjustment in brush height.