| 摘要 |
An adjustable brush particularly suited for use with machines adapted to employ rotary cleaning brushes, characterized by a plurality of concentrically related, annular arrays of tufts of bristles extended from a base plate and substantially terminating in a common plane. A particular feature of the brush resides in a provision of a support plate selectively positioned between said base plate and said plane, including therewithin a multiplicity of annular arrays of tuft-receiving openings, and operatively suspended from said base plate by a plurality of screw-threaded studs adapted to be digitated for repositioning the support plate relative to the plane, whereby the trim length, or effective length of the bristles and, consequently their flexibility, selectively is varied.
|
