Device for loading and unloading a truck using a detachable platform

Claim 1

IN COMBINATION, A TRUCK HAVING A CHASSIS COMPRISING A PAIR OF LONGITUDINALLY EXTENDING SIDE MEMBERS, TRANSVERSELY EXTENDING MEANS CONNECTING SAID SIDE MEMBERS, DOWNWARDLY AND REARWARDLY INCLINED RAILS ON THE REAR PORTION OF SAID CHASSIS OUTWARDLY ADJACENT THE REAR ENDS OF SAID SIDE MEMBERS, OUTWARDLY FLANGED ROLLERS ON THE REAR PORTION OF SAID CHASSIS AT THE FORWARD ENDS OF AND ALIGNED WITH SAID RAILS, THE FORWARD ENDS OF SAID RAILS BEING DISPOSED IMMEDIATELY ADJACENT TO AND LEADING TO THE UPPER PORTIONS OF SAID ROLLERS, A PLATFORM MEMBER ADAPTED TO BE REMOVABLY SUPPORTED ON SAID CHASSIS, SAID PLATFORM MEMBER COMPRISING A CARGO-SUPPORTING BODY, A SUPPORT PIVOTED TO THE FORWARD END PORTION OF SAID PLATFORM MEMBER SUBJACENT SAID BODY, SAID SUPPORT BEING SWINGABLE TO A DEPENDING SUPPORTING POSITION, A PAIR OF LONGITUDINAL DEPENDING BARS SECURED TO THE BOTTOM OF SAID BODY AND BEING SPACED TO BE RECEIVED ON SAID ROLLERS INSIDE THE FLANGES THEREOF, THE DISTANCE BETWEEN SAID SIDE MEMBERS BEING LESS THAN THE DISTANCE BETWEEN SAID BARS, ROLLERS ON THE FORWARD ENDS OF SAID BARS ENGAGEABLE ON SAID RAILS, TRANSVERSELY EXTENDING MEANS CONNECTING THE RAILS ENGAGEABLE WITH SAID SUPPORT RESPONSIVE TO THE REARWARD MOVEMENT OF THE CHASSIS BENEATH THE PLATFORM TO SWING SAID SUPPORT TO A POSITION BENEATH AND SUBSTANTIALLY PARALLEL TO SAID BODY, AND COOPERATING MEANS ON THE CHASSIS AND THE PLATFORM MEMBER LOCKING THE PLATFORM MEMBER TO THE CHASSIS RESPONSIVE TO THE REARWARD MOVEMENT OF THE CHASSIS BENEATH THE PLATFORM MEMBER TO A POSITION WHEREIN THE MAJOR PORTION OF THE CHASSIS UNDERLIES THE PLATFORM MEMBER.