Loading linkage

In a truck frame of a dumpster hauling truck, a linkage providing on-off loading and dumping modes, comprising:

• an elongate dump link extending under a dumpster on the truck and pivoted to the truck frame;
• a pair of interconnected links pivoted to the dump link;
• a first power cylinder for tilting the interconnected links and the dump link relative to the truck frame;
• a second power cylinder for tilting the interconnected links relative to each other to effectuate the on-off loading mode;
• and
• lock means intermediate the interconnected links and the dump link for locking all the links together for movement in unison under power from the first power cylinder in the dumping mode, the lock means being operable to allow unlocking of the dump link from the interconnected links for pivotal movement relative thereto in the on-off loading mode solely upon activation of the second power cylinder prior to activation of the first power cylinder.

A multi-function linkage in a truck frame for providing on-off loading and dumping of a load-receiving body carried on the truck frame, comprising:

• a dump link under the load-receiving body and pivoted on the truck frame;
• a pair of interconnected links extending about the load receiving body and pivoted to the dump link;
• first actuation means for tilting the interconnected links and the dump link relative to the truck frame and for alternatively tilting only the interconnected links relative to the truck frame;
• second actuation means for rotating the interconnected links relative to each other;
• and
• engagement means on the dump link for engaging the interconnected links and connecting all of the links for movement in unison under power from the first actuation means in the dumping mode, the engagement means comprising an end portion of the dump link which overlaps a complementary end portion of one of the interconnected links, whereby upon rotation of the interconnected links relative to each other under power from the second actuation means, the interconnected links are movable relative to the dump link under power from the first actuation means.

In a truck frame for a dumpster hauling truck, the combination of:

• a dump link pivoted at one end to said frame;
• an L-shaped tilt link;
• a secondary link;
• a first pivot connecting said tilt link and said secondary link;
• a first hydraulic cylinder extending between said tilt link and said secondary link for effecting pivotal movement therebetween;
• a second pivot remote from said first pivot and intermediate the ends of said dump link pivotally connecting said secondary link and said dump link;
• and
• a second hydraulic cylinder extending between said frame and said secondary link;
• adjacent sections of said tilt link and said dump link being in interference relation for at least one position of movement of said tilt link to lock said tilt link, said secondary link and said dump link together for movement in unison to provide a dumping mode of operation;
• said first cylinder being operable to move said tilt link from said at least one position to another position whereat said adjacent sections are not in interference relation thereby freeing said tilt link and said secondary link for pivotal movement relative to said dump link to provide an on-off loading mode of operation.