Patent ID: 7140503

Claim:
A pushback rack storage system, comprising: a pair of spaced apart support rails each having a front end and a back end; a first cart including a first pair of spaced apart side rails, each side rail including a first wheel adjacent to a front end of the side rail, and a second wheel located between a back end and a midpoint of the side rail, wherein the midpoint is between, and equally spaced apart from, the front end of the side rail and the back end of the side rail, and wherein each of the second wheels is located closer to the midpoint than to the back end of the side rail to which it is attached; wherein the second wheels are rollable along the support rails up to the back ends of the support rails, such that the back ends of the side rails extend beyond the back ends of the support rails when the second wheels are adjacent to the back ends of the support rails.