Abstract: A cantilever rack structure has at least two wide flange I-beams comprising upright standards connected to each other and with stabilizing base members at their lower ends, the flanges of these standards facing forwardly and rearwardly and with the web between the flanges extending from front to back. One or both flanges of the I-beams has a vertical row of holes therethrough at each side of the web, the rows of holes being close to but spaced laterally from the web. Load-supporting arm members comprise a plate adapted to fit against the flange of an I-beam and a forwardly-projecting rigid arm extending from the plate, each plate having at least two laterally-spaced holes therethrough so that one hole registers with a selected hole in each of the two vertical rows of holes through the I-beam flange, and bolts with removable nuts secure the arms to the uprights. Connecting brace members extend from the front flange at one end to the rear flange at the other.

Abstract: A multi-shelf storage rack having spaced shelf-supporting uprights arranged in pairs, each pair has a front and a rear upright, the uprights having two rows of vertical notches extending vertically thereof in which the shelves are supported. The shelves have a pair of transverse rails extending from the front to back with a stop at the back. A wheeled dolly is positioned on these rails and the dolly has a spring-biased latch pin that restrains it against movement on the rails. An outrigger, can be hung on the uprights in position in front of a selected shelf, secured against accidental removal whereupon a latch pin-releasing device on the outrigger may be operated to release the latch pin on the dolly and the forward end of the dolly rolled from the rails on the shelf onto matching rails on the outrigger to a position where the dolly is exposed vertically for loading or unloading by a crane or hoist.