| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a cab from lowering by a dead weight thereof just before the center of gravity of the cab moves beyond a dead point of a cab tilt when some failure occurs in a hydraulic circuit of a cylinder for tilt, and to prevent the cab from inclining forward by a dead weight thereof when the center of gravity of the cab moves beyond the dead point of the cab tilt and inclines forward. <P>SOLUTION: The cab tilt device includes a cylinder device 3 for tilt that is interposed between a cab and a frame to tilt a cab, and a cab lowering prevention device 20 that is assembled into the cylinder device 3 for tilt. The cab lowering prevention device 20 includes: a stopper 21 that has an upper end pivoted to the cylinder device 3 for tilt and has a plurality of recesses 22 with opposite sides 22a, 22a formed in parallel; a lock lever 26 that is mounted on a cylinder 5 of the cylinder device 3 for tilt to open and close and has a protrusion 27 engaged into the recess 22; and a cylinder device 30 for release that energizes the lock lever 26 in an opening direction to release the engagement with each recess 22. <P>COPYRIGHT: (C)2013,JPO&INPIT |
