US 12,005,536 B2
Method of surface texturing for a writing instrument tip
Julien Bouchet, Montevrain (FR); Stéphane Larue, Montevrain (FR); and Eric Pestour, Montevrain (FR)
Assigned to Société BIC, Clichy (FR)
Appl. No. 17/753,218
Filed by Société BIC, Clichy (FR)
PCT Filed Sep. 11, 2020, PCT No. PCT/EP2020/075464
§ 371(c)(1), (2) Date Feb. 24, 2022,
PCT Pub. No. WO2021/048346, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 19306094 (EP), filed on Sep. 11, 2019.
Prior Publication US 2022/0288728 A1, Sep. 15, 2022
Int. Cl. B43K 1/08 (2006.01); B21D 22/02 (2006.01); B23P 15/00 (2006.01); B43K 7/10 (2006.01)
CPC B23P 15/00 (2013.01) [B21D 22/025 (2013.01); B43K 1/084 (2013.01); B43K 7/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of manufacturing a metallic ball pen tip for a writing instrument comprising a feeding passage extending in an axial direction, the feeding passage reaching in a housing configured to receive a ball, the housing 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 method comprising the steps of:
providing a preform of the metallic ball pen tip comprising the feeding passage and a housing preform, the housing preform being defined by the cylindrical wall and a ball seat preform wall;
machining the ball seat preform wall so as to obtain a stepped wall;
broaching the feeding grooves in the stepped wall;
coining the stepped wall with a spherical die so as to obtain the textured ball seat.