METHOD AND APPARATUS FOR BLOWING CORES ETC. WITH FLUIDIZING AIR ADMITTED RADIALLY AT BOTTOM OF BLOW BOX

摘要

ABSTRACT OF TOE DISCLOSUREThe cavity of a foundry blow box for blowing sandinto molds is formed by a tube extending downwardly butterminating slightly above the blow plate forming thebottom of the blow box, thus forming a peripheral gap whichis essentially the only aperture for the admission offluidizing air. The air tends to blow sand contacting theblow plate directly through its exit into the mold,although fluidizing the remaining said through the cavity.Preferably, especially if quick-setting sand is used, aplunger snugly fitting the tube moves through it to itsbottom so that air from the gap scours the plunger and blowplate, blowing out all sand. As the mold is lowered, apurge pan is substituted to receive any sand beyond themold capacity. The rapid mixer is improved, usingsuccessive notched impeller blades that selectively impactthe two streams of non-curing sand to be mixed. The gap iswider than the sand particles. The plunger is the subjectof a prior application of the inventor, used then with afinely aperture wall.