Tractor truck having body designed for use either as fifth-wheel mount or flat bed

Claim 1

A TRACTOR TRUCK HAVING A FLAT BED BODY WITH A WELL THEREIN, A FIFTH WHEEL HAVING A FLAT TOP PLATE AND MOUNTED IN SAID WELL FOR VERTICAL MOTION FROM AN INOPERATIVE LOWERED POSITION WHEREAT THE FLAT PLATE LIES FLUSH WITH THE FLAT BED INTO AN OPERATING RAISED POSITION WHEREAT THE PLATE IS ELEVATED ABOVE SAID BED, AND A TAIL RAMP HINGED TO THE REAR END OF SAID FLAT BED BODY FOR SWING MOTION ABOUT A TRANSVERSE HORIZONTAL AXIS BETWEEN A RAISED POSITION FLUSH WITH THE FLAT BED AND A LOWERED POSITION INCLINED DOWNWARDLY FROM SAID BED, THE FIFTH WHEEL AND THE RAMP BEING SO FORMED AND POSITIONED THAT WHEN THE FORMER IS RAISED AND THE LATTER LOWERED THE RAMP DIRECTS A TRAILER-CARRIER COMPLEMENT OF SAID FIFTH WHEEL INTO FUNCTIONING ENGAGEMENT WITH THE FIFTH WHEEL, POWER-DRIVEN MEANS BEING PROVIDED FOR MOVING SAID FIFTH WHEEL AND THE RAMP IN CONCERT, THE ONE RAISING WHILE THE OTHER LOWERS.