Bristles having varying stiffness

A - Human Necessities – 46 – B

Patent

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Details

A46B 5/06 (2006.01) A46B 3/06 (2006.01) A46B 7/06 (2006.01) A46D 1/00 (2006.01) A46D 1/06 (2006.01)

Patent

CA 2408679

Bristle stiffness is varied by allowing a support beam (22, 66, 80) that carries the bristles (54, 55, 68, 82, 84) to undergo torsional movement in response to brushing action. Torsional movement is achieved by allowing the support beam to be disconnected to the brush head along at least portions of the length of the support beam. In particularly preferred embodiments, brushes employing the varying stiffness techniques are made with bristle sub- assemblies that have at least one row of bristles connected to a base string or similar structure that functions as a support beam. The base string can be connected across an opening in the brush, and is thus connected at its opposite ends, or it can be connected at any number of spaced intervals, the number and length of spacing being selected to achieve a desired degree of stiffness.

On modifie la rigidité de la soie en faisant subir un mouvement de torsion à un support portant lesdites soies en réaction au brossage. On obtient le mouvement de torsion en permettant au support de se désolidariser de la tête de la brosse au moins sur des parties de la longueur du support. Dans des modes de réalisations particulièrement préférées, les brosses sont faites au moyen des techniques de rigidité variable de sous-ensembles de soie dont au moins une rangée est reliée à un fil de base ou à une structure similaire qui fait office de support. Ledit fil de base peut être relié d'un bout à l'autre de l'ouverture de la brosse, et donc par ses extremités opposées, ou il peut être relié à n'importe quel nombre d'intervalles espacées, le nombre et la longueur de l'espacement étant choisis selon le degré de rigidité désiré.

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