BALLPOINT PEN

WIPO Patent Application WO/2022/230918

A1

This ballpoint pen (1) comprises: a barrel (2); a cylindrical tip (30) having a front edge (30b) at the front end thereof; a cylindrical body (70) disposed behind the first edge (30b); a ball receiving seat (71b) formed at the front end of the cylindrical body (70); a ball (40) held rotatably between the front edge (30b) and the ball receiving seat (71b); a restriction portion (10k) that restricts the rearward movement of the cylindrical body (70); and an elastic member (60) that urges the cylindrical body (70) forward, wherein the cylindrical body (70) has an elastic deformation portion (71d) made of a synthetic resin and has an ink passage (71t) uniformly formed along the axial direction, and the expression 1.02X