Brushroll for vacuum cleaner
View Patent ↗A brushroll for a surface cleaning apparatus includes a brush dowel defining an axis and having opposing bristle supports and a shroud surface between the opposing bristle supports, and a plurality of bristles protruding from the bristle supports. The shroud surface is positioned relative to the bristles to minimize hair wrap.
1. A brushroll for a surface cleaning apparatus, comprising:
a brush dowel defining an axis extending through the brush dowel and comprising:
opposing bristle supports defining a minor diameter and comprising flat mounting surfaces and bristle support platforms which project from the mounting surfaces into a hollow interior of the dowel; and
a shroud surface comprising opposing curved sections extending between the opposing bristle supports and defining a major diameter approximately 90 degrees from the minor diameter, wherein the major diameter is greater than the minor diameter; and
opposing bristle tufts fastened to the opposing bristle supports, the bristle tufts having outermost ends collectively defining a trim diameter, wherein the trim diameter is greater than the major diameter;
wherein the flat mounting surfaces are entirely flat on either side of the bristle tufts; and
wherein the dowel comprises an axis of symmetry extending along the minor diameter.
2. The brushroll of claim 1 , wherein the bristle tufts comprise a plurality of bristles.
3. The brushroll of claim 1 , wherein the opposing bristle supports extend helically around the brush dowel relative to the axis.
4. The brushroll of claim 3 , wherein a plurality of bristle tufts are fastened to each bristle support and arranged in a helically-extending row.
5. The brushroll of claim 1 , wherein a plurality of bristle tufts are fastened to each bristle support.
6. The brushroll of claim 5 , wherein the plurality of bristle tufts are arranged in one of a straight, angled, or helical pattern on the brush dowel.
7. The brushroll of claim 1 , wherein the shroud surface extends between and joins the opposing bristle supports.
8. The brushroll of claim 1 , wherein the hollow interior extends along the axis of the brush dowel.
9. The brushroll of claim 1 wherein the brush dowel is integrally molded from a polymeric material with the hollow interior and the bristle support platforms.
10. The brushroll of claim 1 , wherein bristle holes receiving the bristle tufts are formed in the bristle support platforms.
11. The brushroll of claim 1 , wherein the brush dowel comprises a channel configured to accommodate an implement for cutting wrapped hair.
12. The brushroll of claim 11 , wherein the channel is defined in the shroud surface.
13. The brushroll of claim 11 , wherein the channel is formed by a pair of ribs defining the shroud surface.
14. The brushroll of claim 1 , wherein the dowel comprises a second axis of symmetry extending along the major diameter.
15. A brushroll for a surface cleaning apparatus, comprising:
a brush dowel configured to be mounted for rotation about a central rotational axis extending longitudinally through the dowel, the dowel comprising:
an outer surface consisting of two opposing curved sections defining a shroud surface and two opposing flat sections extending between the two opposing curved sections and defining mounting surfaces of the bristle supports;
a plurality of bristle supports which project into a hollow interior of the dowel from the mounting surfaces;
a plurality of bristles tufts protruding from the bristle supports and defining a trim diameter;
wherein the brush dowel defines:
a major diameter, which is the diameter defined by the smallest circle that can enclose the shroud surface of the dowel; and
a minor diameter, which is the diameter defined by the smallest circle that can touch both opposing flat sections at the tufting locations of the bristle tufts, wherein the minor diameter is less than the major diameter and the trim diameter.