| 摘要 |
A rail(5) is mounted at both sides of the elevator(3), and a slider(9) with a guide groove(7) is coupled with the rail(5). A truck(11) whose both ends are shaped in the form of a fork, is mounted above the slider(9). A rack gear(13), and a fitting hook(15) are mounted under the slider(9). The fitting hook(15) moves along the guide groove(7) of the slider(9), and moves forward in the state of hooking the slider(9) at a specific position. A fitting protrusion(25) is formed at center of the guide groove(7), and the rack gear(13) engages with a pinion gear(23) that is mounted on both ends of a shaft(21).
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