An improved laterally adjustable guide rail mounting structure for a conveyor apparatus is described which eliminates the laterally protruding members characteristic of prior art structures and substantially increases the ease and quickness of lateral adjustment thereof. That structure comprises a pair of upstanding bracket members having inwardly extending tongues adapted to be received through openings in opposite side walls of the conveyor support. The conveyor support side walls are operatively structurally connected by means of a hollow tubular member in registration with the side wall openings, that tubular member receiving the inwardly extending tongues of the guide rail supporting brackets. Means in the form of an expandable wedge assembly are provided for adjustably forcing the bracket tongues into frictional locking engagement with the tubular member in any desired lateral position of the guide rail mounting brackets.
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