Patent ID: 6602011
Filing Date: 2003-08-05
Classification: B43K

Abstract:
A ball point pen comprising:a holder including a front portion; a tip body including a rear end fastened to the front portion of the holder; and a front end having a tip apex edge portion being formed inwardly curved and a ball receiving seat located rearwardly of the tip apex edge portion; a ball rotatably held between the tip apex edge portion and the ball receiving seat; and a spring disposed within the tip body and the holder for pressing the ball toward an inner surface of the tip apex edge portion, the spring comprising: a straight part passing through an inside of the tip body; and a coil part integrally joined to a rear end of the straight part, and disposed within the holder, wherein a protrusion is integrally formed on an inner surface of the holder, so that the coil part is capable of climbing over the protrusion to change from an uncompressed to a compressed state.