Die cast roller skate sole plate

Claim 1

A lightweight, strong sole plate for a roller skate and formed of small crystalline structure cast metal, the plate including a raised periphery, an action screw boss, a front truck ball socket, a longitudinal rib of uniform cross section extending between the screw boss and the front ball socket, and at least two diagonally disposed ribs of a uniform cross section, each rib extending from the sole plate periphery on a given side of the action screw boss to the periphery on an opposite side of the front ball socket and crossing the other diagonally disposed rib and the longitudinal rib at a given point between the action screw boss and the front ball socket, the uniform rib thicknesses encouraging relatively small crystalline structural growth during solidification of liquid metal into the cast metal sole plate, the periphery and the two diagonal ribs together defining two recesses, one recess located on either side of the longitudinal rib, and the periphery defining auxiliary bead formations extending into the recesses sufficiently to prevent lodgement of shot peening materials in the recesses during sole plate casting cleaning.