Truck rear door opening mechanism

A truck body comprising:

• a walled cargo area;
• a rigid rear cargo door for closing said cargo area;
• a four bar linkage having an upper link and a lower link each mounted by a pivot to a side wall of said walled cargo area and each mounted by a pivot to said rear cargo door;
• a linear distance between pivots of said lower link being longer than a linear distance between pivots of said upper link;
• and
• a stop defining a fully open position of said rear cargo door such that a top of said rear cargo door is spaced from a top of said walled cargo area, wherein said stop is arranged such that in said fully open position said rear cargo door is substantially horizontally oriented with a portion extending over a top of said walled cargo area and wherein said upper link is generally C-shaped so as not to interfere with said walled cargo area when said rear cargo door is in said fully open position.

A rear cargo door opening mechanism for a truck having a walled cargo area comprising:

• a four bar linkage having an upper link and a lower link each for mounting by a pivot to a side wall of said walled cargo area and each for mounting by a pivot to said rear cargo door;
• a linear distance between pivots of said lower link being longer than a linear distance between pivots of said upper link;
• an eccentric cam joined to one of said upper link and said lower link;
• a spring for extending around said eccentric cam such that, in use, said spring is in tension and as said rear cargo door opens, said spring slackens;
• said eccentric cam configured such that, in use, as said rear cargo door is opened, said spring slackens more slowly proximate a closed position of said rear cargo door than proximate a point midway between a closed position and an opened position of said rear cargo door.