Ballpoint pen

Details Ballpoint pen Ballpoint pen

B - Operations, Transporting

43

K

B43K 7/00 (2006.01) B43K 1/00 (2006.01) B43K 1/08 (2006.01)

Patent

CA 2409928

An ballpoint pen has: a tip body made of metal having an front edge part and a plurality of inward protrusions; a ball rotatably embraced between the front edge part and the inward protrusions; and a rod part urging the ball forwardly and bringing the ball into close contact with the inner surface of the front edge part, wherein ink outflow gaps are formed each between the adjacent inward protrusions, the rod part is inserted into the central part of the ink outflow gaps, the diameter of a virtual inscribed circle of the central part of the ink outflow gaps is larger than the outside diameter of the rod part, and a minimum dimension of each the ink outflow gap is smaller than the outside diameter of the rod part.

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