Sharp undercutter and undercutter fabrication

B - Operations – Transporting – 26 – B

Patent

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Details

B26B 19/04 (2006.01)

Patent

CA 2574643

This invention employs a serrated or scalloped edge (7) on the undercutter of an electric razor to enhance the shaving performance. This improvement is achieved by promoting hair capture and retention and reducing the cutting forces required to sever the hair. The serrations and/or scallops (9) help retain the captured hair, thereby increasing hair cutting efficiency. They also reduce the tendency for the hair to "roll" along the edge of the foil aperture until it is trapped in the aperture angle; this promotes a closer shave. A serrated edge can be generated by various methods. In this disclosure, several possible methods are described. The preferred method of fabrication is to generate a weld bead on the outer surface of an undercutter blade and grind back the bead to generate sharp edges along the weld bead. In doing so, the weld bead produces a serrated pattern. The geometry of the serration is determined by the geometry of the weld bead.

L'invention concerne le bord dentelé ou festonné (7) de la lame inférieure d'un rasoir électrique, permettant d'améliorer la performance de rasage. Cette amélioration résulte de la saisie et de la rétention des poils, qui permettent de réduire les forces de découpe requises pour sectionner les poils. La configuration dentelée et/ou festonnée (9) contribue à retenir les poils saisis, ce qui augmente l'efficacité de découpe. On réduit aussi la tendance des poils à <= rouler >= le long du bord de l'ouverture de rasage en feuilles tant qu'ils ne sont pas saisis dans l'angle d'ouverture, ce qui favorise un rasage plus précis. Un bord dentelé peut résulter de la mise en oeuvre de différents procédés, et l'invention en décrit plusieurs utilisables à cet effet. Le procédé préféré consiste à produire un cordon de soudure sur la surface externe d'une lame inférieure et à entamer le cordon par meulage pour établir des bords effilés le long de ce cordon. Le cordon ainsi travaillé donne un profil dentelé. La géométrie de dentelure est déterminée par la géométrie du cordon de soudure.

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