| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a writing utensil transmitting a rotating force with good efficiency. <P>SOLUTION: On the surface of a triangular cam main body part 12 of a driving cam 9, a locking projecting part 20 extending in the axial line L direction from the top part of the cam main body part 12 is formed, and this locking projecting part 20 is inserted into a recessed part 21 formed on the inner wall face of a back shaft (a rotating shaft) 2b. Because the locking projecting part 20 to be inserted into the recessed part 21 provided on the back shaft 2b is extended to a hollow part 30 like this, the rotating force is transmitted to the driving cam 9 even in a place of the hollow part 30, and the rotating force of the back shaft 2b is surely transmitted to the end of the driving cam 9 requiring the largest force when the apex 17b of the slide piece 7 is got out of the hollow part 30 of the driving cam 9. Hence, a difference of the forces between when the apex 17b of the following part 17 of the slide piece 7 enters the hollow part 30 of the driving cam 9, and when the apex 17b of the following part 17 of the slide piece 7 is got out of the hollow part 30 of the driving cam 9, is made small as much as possible, so that an easy operation feeling is provided. <P>COPYRIGHT: (C)2009,JPO&INPIT |
