| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a shaking type mechanical pencil in which a weight body 12 wound with a coiled wire and provided with coil springs 12B and 12D on front part 12A and rear part 12C can surely slide in a longitudinal direction with less contact noise of the weight body 12. <P>SOLUTION: A chuck 1 is moved forward by inertial force of the weight body 12 created by shaking the mechanical pencil to send a lead 3 out. A small-diameter portion 12E wound with a closely attached coiled wire is formed between the front part 12A of the weight body 12 and the rear part 12C of the same. The inner diameter of the small-diameter portion 12E is made smaller than the inner diameters of the front part 12A and rear part 12C. A gap between the inner surface of the small-diameter portion 12E of the weight body 12 and the outer surface of a lead tank 4 is made smaller than a gap between the inner surface of a shaft tube and the outer surfaces of the front part 12A and rear part 12C of the weight body 12. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
