Rotary brush section

Claim 1

A rotary brush unit comprising a hub defining transversely split annular channel including an inner cross wall and outwardly directed side walls and having its ends in alignment and delineating said split, radially projecting bristles extending around said hub and having their inner ends anchored in said channel, said bristles being bent to form medial bights located in said channel, an anchoring wire engaging said bights and extending in said channel about said hub, said channel side walls being inwardly crimped along their upper borders to tightly embrace said bristles above said bights and form bulged borders along the inner portion of each side wall and a pair of separate coupling elements engaging each of said side walls and welded to sections of said side walls on opposite sides of said split, each of said coupling elements being similarly shaped and symmetric to a transverse plane and having integrally formed therewith a radially iNwardly extending key defining tongue and each of said coupling elements further including an outer section with an inner border matingly engaging said side wall bulged borders and the adjacent border of said channel cross wall, said coupling element inner border and said side wall bulged border being joined by welding.