Abrégé

A rotary tool containing a core hub with helical groove on its outer surface filled in with continuous abrasive filament formed by folding of a pre-cut abrasive sheet including multiple bristle like straps extending radially from the hub. The method of manufacturing includes the steps of providing a hub, and forming a helical groove with inverted V-shaped cross-section along its cylindrical surface. An abrasive element is wound around the hub so that the folded edge is fed in the V-grove and is buckled inside the groove providing, along with securing it by sufficient pre-tension of the abrasive element, a secure anchoring of the abrasive element through locking of the buckled edge. The abrasive filament is formed from a roll of abrasive cloth as one continuous piece using a cutting operation and is provided with center-line perforations. These perforations assist folding the filament by providing it with discrete and desired flexibility as well as weakening it in such way that it assists the process of folded edge buckling inside the groove during winding and therefore forms a tight anchoring junction with the hub without need for an adhesive.

Classes IPC  ?

• B24D 9/04 - Tambours rigides destinés à être revêtus d'un matériau souple
• B24D 13/04 - Meules dont le corps comporte des parties flexibles au travail, p. ex. meules souples de polissageAccessoires pour le montage de ces meules travaillant par leur périphérie constituées par une pluralité de lamelles ou des bandes entourant l'axe
• B24D 9/00 - Roues ou tambours revêtus d'une couche de matériau abrasif flexible et renouvelable, p. ex. de papier abrasif
• B24D 13/16 - Meules dont le corps comporte des parties flexibles au travail, p. ex. meules souples de polissageAccessoires pour le montage de ces meules travaillant par leur face frontale comprenant des lamelles ou bandes plissées en accordéon
• B24D 18/00 - Fabrication d'outils pour meuler, p. ex. roues, non prévue ailleurs