| 摘要 |
PURPOSE:To prevent falling-off of a packing case by electrically detecting the floating-up of the packing case due to the distorsion of a chassis frame and suppressing the switching operation between the engagement and disengagement of a hinge mechanism. CONSTITUTION:A pair of limit switches Ls and Rs at right and left for detecting the floating-up of a packing case are installed outside a subframe, and a main circuit 28 installed in series with the pair of limit switches Ls and Rs at right and left are connected to the solenoids S1, S2, and S3 of the selector valve of a hydraulic cylinder which engages and disengages a hinge mechanism. Since the both limit switches Ls and Rs are turned ON if the packing case is not floated- up from the subframe, each solenoid S1-S2 can be excited as one wishes. Since either or both of the limit switches Ls and Rs are turned OFF when the packing case is floated-up from the subframe, the solenoid is not excited. Thus, switching of a hinge mechanism 14 is prevented. |
