Method of making improved toothbrush having multi-level tufts with substantially uniformly rounded bristle ends in each tuft
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United States of America Patent
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Nov 24, 1992
Grant Date -
N/A
app pub date -
Dec 30, 1991
filing date -
Dec 30, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of making toothbrushes having bristle tufts with ends in two or more distinct planes, all of said bristle tufts having individual bristles which are substantially uniformly rounded at their free ends. The method of making is a repeated sequence of steps used to attach all of the bristle tufts of the shortest overall length followed by cutting and end rounding of the individual bristles in the first group of tufts while all of the free ends of the bristles are in a first plane. This is done prior to affixing the next group of bristle tufts of greater overall length. The cutting and end rounding sequence is thereafter repeated for each ascending bristle tuft elevation. The final toothbrush bristle contour is a function of the pattern of attachment for each bristle tuft elevation.
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