Abstract: A rack and conveyor shuttle system for placing and retrieving articles of various sizes including a rack system having a shelving framework of at least two tubes spaced apart from one another at a distance, wherein the distance between the tubes is sufficient to support the article in a single stack and a motorized, conveyor shuttle system having at least two finger-like conveyors spaced apart from one another at a distance, wherein the distance between the finger-like conveyors is sufficient to move in between the two tubes so as to engage the article wherein the conveyor shuttle system is adapted to interlace in between the rack system for both placing and retrieving the article.

Abstract: A self-propelled mobile stacker for an automated storage and retrieval system having a mast assembly of lightweight non-metallic material removably installed on a metal chassis. The mast assembly comprises a mast and base formed of a common "I"-shaped composite with the mast secured in the vertical position exclusively by composite non-metallic material gussets adhesively bonded by epoxy to the mast and base.