| 摘要 |
A ball-point pen has an outer housing containing an ink reservoir tube with a writing tip supported in a nose piece in the shape of a cone which is press-fitted thereon. The nose cone is provided with a rear extension having a cylindrical outer wall and an inner concentric cylindrical wall having a central through bore that receives the writing tip. The cylindrical walls define an annular space therebetween that has a bottom seat. The ink reservoir tube is provided with a central ink passage and the end of the tube is received in the annular space with the inner cylindrical wall of the nose piece received within the ink passage whereby the passage and the bore are in communication. The elements are sized so that the reservoir tube is press-fitted on the inner cylindrical wall of the nose piece and the outer cylindrical wall exerts a radially inwardly biasing force against the reservoir tube to maintain the reservoir tube tightly wedged against the inner cylindrical wall. The writing tip is force fitted into the front end of the nose piece, and the whole assembly force fitted into a suitable outer casing.
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