Ball-point pen
AssigneeMitsubishi Pencil Company, Limited
InventorKoichi Hirano
Life of this patent
Estimating the term…
Abstract
A ball-point pen, wherein a cover member (6) is fitted to a joint member (3) connecting a writing tip (1) rotatably supporting a writing ball (2) at the tip thereof to an ink storage tube. When the cover member (6) is fitted to the joint member (3) along the outer peripheral surface thereof, a part of the cover member does not come within 0.2 mm (within the range of the chain double-dashed line) from around the writing tip. Thus, even if the accuracies of parts and assembly machines are dispersed, a problem with an existing ball-point pen wherein a cover member is brought into contact with a writing tip and the writing tip is damaged in an assembly step can be avoided.
Claims7
A ball-point pen having a writing tip at a top end of which a writing ball is rotatably supported, an ink storage tube inside of which ink is stored, and a joint member for connecting said writing tip and said ink storage tube and supplying the ink in the ink storage tube to said writing tip side, characterized in that a cover member is further provided which can be fitted and mounted along a perimeter surface of said joint member, and said cover member is arranged in dimensions so as not to approach within 0.2 mm of said writing tip when said cover member is fitted along the perimeter surface of the joint member to which the writing tip is mounted.
A ball-point pen having a writing tip at a top end of which a writing ball is rotatably supported, an ink storage tube inside of which ink is stored, and a joint member for connecting said writing tip and said ink storage tube and supplying the ink in the ink storage tube to said writing tip side, characterized in that a cover member is further provided which can be fitted and mounted along the inside of a mounting hole formed at said joint member, and said cover member is arranged in dimensions so as not to approach within 0.2 mm of said writing tip when said cover member is fitted along the inside of the mounting hole of the joint member to which the writing tip is mounted.
(canceled)
Dependencies are inferred from the claim text.