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1. 发明专利

JP2001180178A NEEDLE TYPE BALLPOINT PEN REFILL 失效
公开(公告)号：JP2001180178A
公开(公告)日：2001-07-03
申请号：JP37037999
申请日：1999-12-27
申请人： DONG A PENCIL CO LTD
发明人： KIN CHUKEI
IPC分类号： B43K1/08 , B43K7/02 , B43K7/10
摘要： PROBLEM TO BE SOLVED: To improve a sense of writing by suppressing a friction with a ball at a writing time to a minimum limit by forming the end part of the linear part of an elastic member contacted with the ball in a curved surface. SOLUTION: The needle type ballpoint pen refill comprises an ink storage tube 2 containing an ink and having a follower inserted into the rear part of the ink and moving as the ink is worn, a tip 20 inserted at the end part of its one side into the tube 2 and assembled with a tip holder 20 and formed at the inner surface of the end part of its opposite side with a ball holding part 26, and a ball 30 rotatably provided in the part 26 so as to be partly exposed with the end of the tip 20. An elastic member 34 has an elastic part 36 of a spiral shape for storing an elastic force, and a pressing part 35 of a linear shape formed by being coupled to the part 36. In this case, the end part of the linear part contacted with the ball of the part 38 is bent and formed with a curved surface.

2. 发明专利

JP2001180172A TIP FOR WRITING INSTRUMENT AND MANUFACTURING METHOD FOR THE SAME 失效
公开(公告)号：JP2001180172A
公开(公告)日：2001-07-03
申请号：JP37325599
申请日：1999-12-28
申请人： DONG A PENCIL CO LTD
发明人： KIN CHUKEI
IPC分类号： B43K1/08 , B21D22/26 , B21D53/76 , B43K7/00
摘要： PROBLEM TO BE SOLVED: To enable a mass production to be precisely conducted by improving durability and a strength without existing a brittle part to a moment and smoothly supplying an ink. SOLUTION: The trip for a writing instrument comprises a small diameter part 4 having an inner diameter corresponding to the outer diameter of a ball 12 rotatably assembled at its tip end, a large diameter part 8 having an inner diameter larger than that of the part 4, a coupling part 6 for flexibly coupling the part 4 to the part 8 and made of a curved surface, and a reinforcing part 7 formed to project to its outside between the part 6 and the part 8. In this case, a predetermined plate material is deep drawn at many stages to integrally form the trip for the instrument.

3. 发明专利

JP2001191680A NEEDLE TIP FOR WRITING INSTRUMENT AND MANUFACTURING METHOD FOR THE SAME 失效
公开(公告)号：JP2001191680A
公开(公告)日：2001-07-17
申请号：JP2000001636
申请日：2000-01-07
申请人： DONG A PENCIL CO LTD
发明人： KIN CHUKEI
IPC分类号： B43K1/08 , B21D22/14 , B21D41/04 , B21D53/76 , B43K7/02
摘要： PROBLEM TO BE SOLVED: To save a mold cost by eliminating a fragile part to a moment, improving durability and a strength, and smoothly supplying an ink. SOLUTION: A needle tip for a writing instrument comprises a cylindrical part 4 formed in a larger inner diameter than the outer diameter of a ball 12, a conical part 6 formed on an oblique surface extended from on tip part of the part 4 and gradually reducing in its diameter, and a ball holding part 8 formed with a plurality of holding protrusions 9 projected from the tip part of the conical part 6 to the inside and rotatably assembled with the ball 12. In this case, the part 6 and the part 4 are integrally formed by spinning. The method for manufacturing it comprises a step of spinning to form the part 4 having an inner diameter larger than the outer diameter of the part 6 and the ball 12, and a step of punching to project the plurality of the protrusions 9 for rotatably assembling the ball at the tip part of the part 6 on the inner periphery.

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