| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manually-operated expansion/contraction mechanism that is provided at a rocking mechanism of a levee plastering machine for rocking the levee plastering machine relative to a traveling machine body and that is easy to operate and can be easily locked in a rocked state. <P>SOLUTION: An operator grips a gripping part 40 together with an unlocking operation part 52 by one hand and thereby the unlocking operation part 52 is rotated against the elastic force of an elastic member 55, with a support shaft part 54 serving as its center of rotation, whereby a lock pin 51 is pulled out of an inner hole part 35. As a result, an outer cylinder 20 and an inner rod 30 become slidable against each other, and a manually-operated expansion/contraction adjusting mechanism 17 can expand or contract as a whole. After the manually-operated expansion/contraction adjusting mechanism 17 expands or contracts, the operator loses his hold of gripping, whereby the lock pin 51 is inserted into the inner hole part 35 to lock an expanded or contracted state. <P>COPYRIGHT: (C)2013,JPO&INPIT |
