US 12,220,938 B2
Ball point tip and writing instrument fitted with such a ball point tip
Jean-Baptiste Boura, Clichy (FR)
Assigned to SOCIÉTÉ BIC, Clichy (FR)
Appl. No. 17/600,783
Filed by SOCIETE BIC, Clichy (FR)
PCT Filed Apr. 10, 2020, PCT No. PCT/EP2020/060305
§ 371(c)(1), (2) Date Oct. 1, 2021,
PCT Pub. No. WO2020/208221, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 19305466 (EP), filed on Apr. 10, 2019.
Prior Publication US 2022/0194119 A1, Jun. 23, 2022
Int. Cl. B43K 1/08 (2006.01); B43K 7/10 (2006.01); B43K 15/00 (2006.01)
CPC B43K 1/086 (2013.01) [B43K 7/10 (2013.01); B43K 15/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A ball point tip comprising:
a ball holder having an ink conduit and a ball house, the ink conduit extending axially and comprising a first axial end, a second axial end, and opening into the ball house, the ball house including a stop, and a ball accommodated into the ball house,
a leaf spring axially disposed between the ball and the second axial end of the ink conduit, the leaf spring having a main body and a plurality of tongues extending radially from the main body, ink passages being formed between the plurality of tongues in order to fluidly connect the ink conduit and the ball house;
a shoulder axially disposed between the first axial end of the ink conduit and the leaf spring; and
an annular reinforcement filet is axially disposed between the first axial end of the ink conduit and the shoulder,
wherein the stop has a frustoconical shape and is disposed radially between a wall of the ball house and the leaf spring,
wherein the ball holder and the leaf spring are made of plastic and form together a single piece.