| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a structure of knock rods, which can simplify formation and fitting of the knock rods used in a duplex writing utensil and management of the number of components.SOLUTION: In a duplex writing utensil 10 having a plurality of refills 30 stored in a barrel 20A, a knock rod molding body 70, which comprises a plurality of knock rods 50 installed in rear ends of the refills 30, is formed integrally by injection molding in a shape in which rear ends of the knock rods 50 are connected to tips of runners 72 protruding radially from an annular connection body 71. The runners 72 can be bent toward a direction of bundling the knock rods 50 toward a shaft core of the duplex writing utensil 10. The plurality of knock rods 50 bundled while the runners 72 are bent are installed into the barrel 20 for every connection body 71, and the runners 72 are formed to be breakable by first knock operation to the installed knock rods 50.</p> |
