Patent ID: 6902334

Claim:
A ball-point pen, comprising: a tip holder, a body tube, a coil spring, a refill, a ball-point pen tip, and an active back plug and push mechanism, wherein said coil spring is provided inside the tip holder, the active back plug and push mechanism is fitted in the back end of body tube being capable of sliding, the refill is placed inside the space formed between the tip holder and body tube, wherein the characteristic includes: a concave first stepped portion is formed on the outer surface of the tip holder in contact with one end of said body tube, which has a protruded first snap thereon, and said body tube comprises a mid tube, upper tube, and pen cap; a concave second stepped portion is formed on the outer surface of said mid tube in contact with one end of the upper tube, wherein its extended part has a number of spring; a concave stepped portion is formed in terms of the outer surface formed by the spring and the outer surface of the second stepped portion; the inner side of said spring has a snap which fits in the first snap; the first stepped portion in said tip holder fits in said mid tube; the second stepped portion in said mid tube fits in the first end of said upper tube; and the second end of said upper tube fits in said pen cap.