Patent ID: 8739985
Filing Date: 2014-06-03
Classification: B65G

Abstract:
1. A push-back storage system, comprising: a rack structure forming vertically stacked lanes; a single pair of push-back rails in each of the lanes, with the pair including a left side push-back rail and right side push-back rail, and with the left and right side push-back rails each having upper and lower inner flanges joined to a web section, and with the inner flanges of the left and right side push-back rails extending towards each other; a respective fourth cart having outer left and right front wheels and left and right back wheels rolling on the lower inner flanges of the left and right side push-back rails, and with the fourth cart having left and right side rails; a respective third cart having outer left and right front wheels rolling on lower inside left and right flanges of said left and right side rails of the fourth cart, and having outer left and right back wheels rolling on the lower inner flanges of the left and right push-back rails, respectively; a respective second cart having outer left and right front wheels rolling on lower inside left and right flanges of left and right side rails of the third cart, and having outer left and right back wheels rolling on the lower inner left and right flanges of the left and right push-back rails, respectively, with the second cart having left and right side top flanges each extending laterally outwardly over the left and right side rails of the fourth cart; a respective first cart having left and right front and left and right back inner facing wheels rolling on a top surface of the left and right push-back rails, respectively, with the first cart having front, back, left and right side members joined to each other, and with vertical sections joined to the first cart to provide wheel supports; and left and right anti-liftoff channel sections attached to a bottom surface of the first cart and extending under said left and right side top flanges on the second cart to prevent the first cart from lifting off of the second cart, and with the left and right anti-liftoff channel sections vertically above the left and right side rails of the fourth cart.