| 摘要 |
PURPOSE:To prevent a cab from going to sudden forward tilting with a simple structure, by clamping a lock shaft to the cab side, and installing an engaging part, which forms a circular surface setting a distance between the center of a connecting shaft, connecting a lifting gear to a lost motion link, and the lock shaft outer surface at the time of cab tilting, down to a radius, in this lifting mechanism. CONSTITUTION:A lock shaft 20 is clamped to the side of a cab 4, and a projection 8, which forms a circular surface 18b setting a distance between the center of a connecting shaft 16 of a lifting mechanism 6 and a lost motion link 14 and the lock shaft outer surface at the time of cab tilting down to a radius, is installed in this lifting mechanism 6. With this, during an interval from a state before entering overtilting to tilt completion, the circular surface 18b of the projection 18 is constituted so as to be engaged with the lock shaft 20. Therefore, if the cab 4 tries to tilt forward in a state of being overtilted, a bracket 12 and the lock shaft 20 both are also tilted simultaneously, whereby the lock shaft 20 is engaged with a lower surface 18b of the projection 18. With this constitution, sudden forward tilting of the cab 4 at the time of overtilting is preventable with a simple structure. |
