| 摘要 |
PROBLEM TO BE SOLVED: To adopt an extensible operation member in order to make thinning and operability improvement compatible so that a lock operation to an extended state and a contracted state is made easy, and unnecessary unlocking from the locking state is evaded. SOLUTION: This is the extensible operation member 40 which is movably combined with a shaft 44 in the axial direction and the peripheral direction in the cylindrical main body 41. A convex part 44a is installed at the outer face of the lower end part of the shaft 44. A guide groove 46 into which the convex part 44a is fitted and the shaft 44 is guided in the axial direction is installed at the inner face of the main body 41. The guide groove 46 possesses a pair of key parts 47 extended into the same peripheral direction in the peripheral grove state wherein the convex part 44a is rotated in the same direction and fitted to both end parts in a state that the shaft 44 is advanced from the main body 41 and the shaft 44 is retreated in the main body 41. The shaft 44 is not only energized in the axial direction but also in the direction in which the convex part 44a is fitted to the pair of the key parts 47 by a twisted spring 4. For this reason, at the advanced position and the retreated position of the shaft 44, the convex part 44a is automatically fitted to the key part 47 and the shaft 44 is locked. COPYRIGHT: (C)2006,JPO&NCIPI
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