Socket for holding the writing ball of a ball point pen
AssigneeThe Sailor Pen Co., Ltd.
InventorsKoso Nakashiki, Akira Yoshimoto, Kazuhiko Osaki
Life of this patent
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Abstract
A socket for holding the writing ball of a ball point pen comprising an outer tubular member having a circular cross section and an inner tubular member having an elliptic or circular cross section, wherein an ink-conducting chamber or chambers are defined between the inner peripheral wall of the outer tubular member and the outer peripheral wall of the inner tubular member, thereby enabling ink to be conducted smoothly from an ink cartridge provided in the ball point pen through the chambers to the writing ball.
Claims25
A socket for holding the writing ball of a ball point pen comprising:
- an outer tubular member having a substantially circular cross section;
- an inner tubular member of substantially elliptic cross section which is inserted into the outer tubular member, such that one end of said inner tubular member is positioned more inward of the socket than the corresponding end of said outer tubular member;
- ink conducting chambers of substantially crescent cross section defined between the inner peripheral wall of the outer tubular member and the outer peripheral wall of the inner tubular member and extending along the full length of said inner tubular member;
- a ball-bearing rod inserted into the inner tubular member;
- and
- a writing ball rotatably supported by one end of the outer tubular member and that end of the ball-bearing rod which is disposed adjacent to said one end of the outer tubular member.
A socket for holding the writing ball of a ball point pen comprising:
- an outer tubular member having a polygonal cross section at one end and a substantially circular cross section in the remaining portion;
- an inner tubular member having a smaller outer diameter than the inner diameter of the outer tubular member and concentrically inserted into the outer tubular member with one end of the inner tubular member forced into said one end of the outer tubular member;
- a hollow substantially cylindrical ink-conducting chamber defined between the inner peripheral wall of the outer tubular member and the outer peripheral wall of the inner tubular member;
- a ball-bearing rod inserted into the inner tubular member;
- and
- a writing ball rotatably held by the other end of the outer tubular member and the other end of the ball-bearing rod.
Dependencies are inferred from the claim text.