Unitary cargo bin and track assembly

Apparatus for retaining cargo on and discharging cargo from a load-bearing platform, said apparatus comprising:

• a cargo bin;
• a pair of parallel rails each of length approximately equal to the length of said cargo bin and each comprising a fixed forward portion and a pivotal rear portion having a pivot axis at the rear end thereof, said cargo bin overlying the entire length of said rails when said cargo bin is in a horizontal load bearing position;
• a row of rollers affixed to each said rail with their axes transverse thereto, each said row including rollers affixed to said fixed forward portion and to said pivotal rear portion;
• a pair of C-shaped channels affixed to the underside of said cargo bin, each said C-shaped channel opening laterally and adapted to accommodate one said row of rollers and to prevent lateral disengagement thereof;
• and
• means for limiting the rearward travel of said cargo bin at a second position at which said C-shaped channels have cleared the rollers affixed to said fixed forward portion but are still in engagement with the rollers affixed to said pivotal rear portion.