Textured ball seat
AssigneeSociete BIC
InventorJulien Bouchet
Life of this patent
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Abstract
A metallic ball pen tip for a writing instrument comprising a feeding passage extending in an axial direction, the feeding passage reaching in a recess configured to receive a ball, the recess being defined by a cylindrical wall and a ball seat, wherein the ball seat comprises a plurality of feeding grooves and wherein the ball seat is textured, the texture comprising a plurality of blind holes having a depth equal to or smaller than 50 μm, preferably equal to or smaller than 10 μm, more preferably equal to or smaller than 5 μm, more preferably equal to or smaller than 1 μm, the blind holes having a total surface equal to or greater than 20% of the ball seat, preferably 60% and equal to or smaller than 90% of the ball seat, preferably 85%. A method of manufacturing a metallic ball pen tip.
Claims16
A metallic ball pen tip for a writing instrument, the metallic ball pen tip comprising a feeding passage extending in an axial direction, the feeding passage reaching in a recess configured to receive a ball, the recess being defined by a cylindrical wall and a ball seat, wherein the ball seat comprises a plurality of feeding grooves and wherein the ball seat is textured, the texture comprising a plurality of blind holes having a depth equal to or smaller than 50 μm, the blind holes having a total surface equal to or greater than 20% of the ball seat, and equal to or smaller than 90% of the ball seat;
- wherein the blind holes have an elongated section having a width equal to or greater than 10 μm and equal to or smaller than 150 μm and a length equal to or greater than 70 μm.
A method of manufacturing a metallic ball pen tip for a writing instrument, the metallic ball pen tip comprising a feeding passage extending in an axial direction, the feeding passage reaching in a recess configured to receive a ball, the recess being defined by a cylindrical wall and a ball seat, wherein the ball seat comprises a plurality of feeding grooves and wherein the ball seat is textured, the texture comprising a plurality of blind holes having a depth equal to or smaller than 50 μm, the blind holes having a total surface equal to or greater than 20% of the ball seat and equal to or smaller than 90% of the ball seat, the method comprising a step of making the blind holes using a laser technology;
- wherein the blind holes have an elongated section having a width equal to or greater than 10 μm and equal to or smaller than 150 μm and a length equal to or greater than 70 μm.
Dependencies are inferred from the claim text.