Spiral brush section
OwnerArthur E. Drumminventor
Life of this patent
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Abstract
A helical brush section consisting of a split tubular support or drum. The drum is offset at the split when the brush strip is helically wound thereon with its ends corresponding to the shoulders at the ends of the offset drum. Then the section is subjected to axial pressure to restore the drum to cylindrical form which distorts and flattens the ends of the brush strip inwardly substantially flush with the drum ends. Multiples of this resulting section are adapted to be disposed on a mandrel with their adjacent edges and shoulders in axially-abutting relationship to form a continuous helical rotary brush with a minimum of bristle gaps at the flattened ends of the brush strips.
Claims12
A helical brush section for use in axially-aligned relationship to form a rotary brush comprising a tubular bristle-carrying drum, a brush strip helically wound on the drum from one end to the other with its ends at the drum ends, said strip being formed of a channel which carries radially-projecting bristles, said ends of the brush strip having the corresponding channel ends distorted inwardly substantially flush with the corresponding drum ends, said tubular support being rolled sheet metal joined at a longitudinal joint where the adjacent edges of the sheet are offset longitudinally to form opposed end helical edges and shoulders and the brush strip is helically wound thereon until its ends correspond to the shoulder and the drum is restored by axial pressure to cylindrical form which distorts the ends of the channel substantially flush with the drum ends.
The method of forming a helical brush section which comprises forming a tubular support by offsetting the adjacent edges of a longitudinally-split tube at the split thereof to form opposed helical edges at its ends terminating in shoulders, and mounting thereon a helically-extending bristle-carrying strip with its ends corresponding to the shoulders and then subjecting the assembly to axial pressure to eliminate the offset of the tube so it is of substantially cylindrical form with the ends of the strip distorted to substantially flush relationship with the tube ends.
Dependencies are inferred from the claim text.