| 摘要 |
A pair of cleat forming wheels are journalled within a frame on each side of the packing chamber of an extruding type slab forming machine, to produce shear keyway recesses in the side walls of the slab as it is formed. The wheels are connected together for rotation in the same direction by an idler gear or chain sprocket connection. The teeth on the rear or following wheel are slightly smaller than the teeth on the leading or forming wheel so that the teeth on the rear wheel finish off the forming of the recesses without damaging same. Automatic self-alignment of the teeth of the rear wheel with the recesses is provided by an adjustable slip clutch between the rear wheel and the drive connection from the leading wheel.
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