Articulated chassis dump trailer

Claim 1

A SELF-SUPPORTING UNITARY DUMP TRAILER COMPRISING, IN COMBINATION: A CHASSIS INCLUDING A LONGITUDINAL FRAME AND SUPPORTING NON-STEERABLE FRONT AND REAR WHEEL AND DEAD AXLE ASSEMBLIES THEREFOR DISPOSED ADJACENT THE FRONT AND REAR ENDS RESPECTIVELY OF THE FRAME; SAID FRAME COMPRISING FORWARD AND REARWARD FRAME SECTIONS ARRANGED END-TO-END AND IN LONGITUDINAL ALIGNMENT AND MEANS PIVOTALLY CONNECTING THE ADJACENT ENDS OF THE FRAME SECTIONS TOGETHER WHEREBY SAID SECTIONS MAY BE ARTICULATED WITH RESPECT TO ONE ANOTHER ABOUT A TRANSVERSE AXIS; THE FORWARD FRAME SECTION BEING SUBSTANTIALLY LONGER THAN THE REARWARD FRAME SECTION AND THE AXIS OF ARTICULATION OF SAID SECTIONS BEING DISPOSED CLOSELY ADJACENT THE AXLE OF SAID REAR WHEEL AND AXLE ASSEMBLY; RELEASABLE MEANS FOR LOCKING SAID FRAME SECTION AGAINST ARTICULATION; A DUMP BODY OF LENGTH SUBSTANTIALLY COEXTENSIVE WITH SAID LONGITUDINAL FRAME AND BEING POSITIONED THEREON SO THAT ITS MAJOR LENGTH EXTENDS FORWARDLY OF SAID AXIS OF ARTICULATION; MEANS PIVOTALLY INTERCONNECTING THE DUMP BODY AND THE REARWARD FRAME SECTION IN MANNER AS PERMITS BODILY UPWARD TILTING MOVEMENT OF SAID DUMP BODY WITH RESPECT TO SAID REAR FRAME SECTION ABOUT A TRANSVERSE AXIS EXTENDING ACROSS THE REARWARD END OF SAID REARWARD FRAME SECTION; AN EXTENSIBLE LIFT DEVICE FOR BODILY TILTING SAID DUMP BODY ABOUT SAID REAR-END AXIS, SAID LIFT DEVICE BEING CONNECTED AT ITS UPER END TO THE FRONT END OF THE DUMP BODY AND AT ITS LOWER END TO THE FRONT END OF THE FORWARD FRAME SECTION; AND A TOW BAR PIVOTALLY CONNECTED TO AND EXTENDING FORWARDLY FROM THE FORWARD FRAME SECTION; THE CONSTRUCTION AND ARRANGEMENT BEING SUCH THAT WHEN THE LOCKING MEANS IS EFFECTIVE TO LOCK THE FRAME SECTIONS AS AFORESAID, THE DUMP BODY MAY BE TILTED TO A LOW ANGLE DUMPING POSITION WITHOUT FRAME ARTICULATION AND THAT WHEN THE LOCKING MEANS IS RELEASED, THE DUMP BODY MAY BE SELECTIVELY TILTED EITHER TO A FIRST HIGHER POSITION AS PERMITTED BY ARTICULATION OF THE FRAME SECTIONS WITH RESPECT TO ONE ANOTHER OR TO A SECOND YET HIGHER POSITION AS PERMITTED BY THE UPWARD TILTING MOVEMENT OF THE DUMP BODY WITH RESPECT TO THE REARWARD FRAME SECTION.