BALLPOINT PEN

PROBLEM TO BE SOLVED: To obtain a ballpoint pen in which an ink housing member and a tip holder are not formed of a specific material but can be formed of a material which has been heretofore used with a simple structure and a crack hardly occurs in the member. SOLUTION: In the ballpoint pen, a rear...

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1. Verfasser:	IWABUCHI YOICHI
Format:	Patent
Sprache:	eng
Schlagworte:	BUREAU ACCESSORIES IMPLEMENTS FOR WRITING OR DRAWING PERFORMING OPERATIONS TRANSPORTING WRITING OR DRAWING IMPLEMENTS
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creator	IWABUCHI YOICHI
description	PROBLEM TO BE SOLVED: To obtain a ballpoint pen in which an ink housing member and a tip holder are not formed of a specific material but can be formed of a material which has been heretofore used with a simple structure and a crack hardly occurs in the member. SOLUTION: In the ballpoint pen, a rear end of the tip holder having a ballpoint pen tip including a ball rotatably provided at a tip is press injected into and mounted at a protrusion formed on an inner wall of a tip opening of the ink housing member in which an ink for the ballpoint pen is directly filled. A stepped part in which an inner diameter of a rear end opening side is wide and which is formed on the inner wall of the rear end of the tip holder and/or a stepped part in which an outer diameter of the rear end opening side is narrow and which is formed on the outer wall of the rear end of the tip holder are disposed at the tip opening side of the ink housing member from a position at which a connecting surface for constituting the stepped part is opposed to the protrusion. COPYRIGHT: (C)2003,JPO
format	Patent
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SOLUTION: In the ballpoint pen, a rear end of the tip holder having a ballpoint pen tip including a ball rotatably provided at a tip is press injected into and mounted at a protrusion formed on an inner wall of a tip opening of the ink housing member in which an ink for the ballpoint pen is directly filled. A stepped part in which an inner diameter of a rear end opening side is wide and which is formed on the inner wall of the rear end of the tip holder and/or a stepped part in which an outer diameter of the rear end opening side is narrow and which is formed on the outer wall of the rear end of the tip holder are disposed at the tip opening side of the ink housing member from a position at which a connecting surface for constituting the stepped part is opposed to the protrusion. 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SOLUTION: In the ballpoint pen, a rear end of the tip holder having a ballpoint pen tip including a ball rotatably provided at a tip is press injected into and mounted at a protrusion formed on an inner wall of a tip opening of the ink housing member in which an ink for the ballpoint pen is directly filled. A stepped part in which an inner diameter of a rear end opening side is wide and which is formed on the inner wall of the rear end of the tip holder and/or a stepped part in which an outer diameter of the rear end opening side is narrow and which is formed on the outer wall of the rear end of the tip holder are disposed at the tip opening side of the ink housing member from a position at which a connecting surface for constituting the stepped part is opposed to the protrusion. 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subjects	BUREAU ACCESSORIES IMPLEMENTS FOR WRITING OR DRAWING PERFORMING OPERATIONS TRANSPORTING WRITING OR DRAWING IMPLEMENTS
title	BALLPOINT PEN
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