| 摘要 |
PURPOSE:To positively engage a main hook with an engaging member when a cabin is to be locked by mounting the main hook, a rock handle, a first safety hook, a second safety hook, a first set-hook, and a second set-hook to the cabin. CONSTITUTION:When a main hook 19 is engaged with an engaging member 12, or when a cabin is locked, a second set-hook 43 is not engaged with an engaging member 14a, but a specified stroke between a second safety hook 41 and the engaging member 14a is secured. For locking the cabin 2 into a normal lock-position, when the cabin 2 is tilted down, the safety hook 41 is engaged with the engaging member 14a so as to restrict tilt-up of the cabin 2 and holds the cabin in a normal lock-position so that the main hook 19 can engage the engaging member 12. Thus, the main hook 15 can be easily engaged with the engaging member 12 when the cabin is to be locked. |
