| 摘要 |
PURPOSE: An adjustable writing instrument is provided to rotate a handle part and to adjust the thickness of a handle. CONSTITUTION: An adjustable writing instrument comprises a support rod(11), a first directional screw part(23a,23b), a second directional screw part(24a,24b), and an elastic material(21,22). The first directional screw part is placed at the upper side of the support rod and moves by turning a handle part(20). The second directional screw part is placed at the lower side of the support rod and moves in an opposite direction to the first directional screw part. The first directional screw part comprises a male screw(23a) and a female screw(23b). |
