Ball tip for a writing instrument and method for making same

B - Operations – Transporting – 43 – K

Patent

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Details

B43K 1/08 (2006.01)

Patent

CA 2488282

The ball point comprises a body having a front surface and a housing emerging in an opening in the front surface and communicating with a passage supplying a fluid. A ball can rotate freely in the housing. The body front surface has a peripheral portion parallel to the median plane of the opening and a flared portion adjacent to the opening periphery which forms at the point of contact of the ball with the opening periphery an acute angle with the emerging part of the plane tangent to the ball at the contact point.

Pointe à bille pour instrument d'écriture comprenant : - un corps de pointe (2) présentant une face avant (4) et comportant un logement (6) qui débouche dans une ouverture (7) ménagée dans ladite face avant (4) et qui communique avec un passage (8) d'amenée d'un fluide; et - une bille (3) montée librement rotative dans le logement (6). La face avant (4) du corps de pointe (2) présente une portion périphérique (11) sensiblement parallèle au plan moyen de l'ouverture et une portion évasée (12) adjacente au pourtour de l'ouverture, qui forme, au point de contact (13) de la bille (3) avec le pourtour de l'ouverture, un angle aigu .alpha. inférieur à 70 degrés avec la partie émergente du plan (T) tangent à la bille au dit point de contact. L'invention concerne également le procédé de fabrication d'une telle pointe à bille et son application à un stylo à bille.

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