| 摘要 |
PURPOSE: A writing tool whose both ends simultaneously appear is provided to have an eraser holder in the other end of a marker pen, thereby containing an eraser in a body after using the eraser. CONSTITUTION: A writing tool whose both ends simultaneously appear comprises the following units. A cartridge(500) includes a nib for writing. A slit is formed in a middle coupling part(700). A nib hole is formed in a lower shaft(200) so that the nib appears. The lower shaft is coupled with the middle coupling part. The upper shaft(100) forms a screw thread. A cam(400) forms protrusions on the surface of an inner wall. The cam is coupled with the end of the upper shaft. An eraser holder(300) is in the middle coupling part. A ball shutter(600) is contained in the lower shaft to open/close the nib hole by up/down movement of the cartridge. |
