Mitsubishi Pencil Kabushiki Kaisha

Mitsuhiro Ohashi

Kazuhiko Furukawa

Atsushi Nakajima

Hiroyuki Muto

There is provided a ballpoint pen tip in which a shoulder of a bent portion does not touch a paper surface during writing and bleeding caused by deformation of an inner periphery of the bent portion can be prevented, and an ink refill using thereof. The ballpoint pen tipcomprises a first tapered surfaceformed by tapering an outer periphery at a front end of a holdera connecting surfacethat is formed at a front end side of the first tapered surfaceand has an outside angle larger than 180&#xb0; with respect to the first tapered surface, a second tapered surfacethat is formed at a front end side of the connecting surfaceand has an outside angle smaller than 180&#xb0; with respect to the connecting surface, and a bent portionin which a front end portion of the second tapered surfaceis bent inwardly so as to hold a writing ballinserted into a ball houseA boundary between the first tapered surfaceand the connecting surfaceis referred to as a first shoulder portion, and a boundary between the second tapered surfaceand the bent portiona second shoulder portion. The second shoulder portionis located inside a virtual tangent linebetween the first shoulder portionand the writing ball

Growing community of inventors

Yokohama, Japan

Mitsuhiro Ohashi