Patent ID: 7547207

Claim:
A cooling arrangement for a mold centering device for multi-level stack molds having a spline shaft with a central region journaled for axial rotation to an intermediate mold level with involute spline pathways extending in oppositely twisting helices from said central region toward opposite ends thereof and respective spline nuts secured to adjacent mold levels threadedly engaging said spline pathways to run therealong for converting linear motion into rotational motion and vice versa thereby controlling relative opening and closing rates of said adjacent mold levels relative to said intermediate mold level therebetween, said cooling arrangement comprising: an internal fluid passageway extending along said spline shaft into a region of said spline shaft received in said spline nuts; a fluid inlet communicating with and for supplying fluid to said fluid passageway; a fluid outlet communicating with and for discharging said fluid from said fluid passageway; and, fluid guide means for causing said fluid to flow along said fluid passageway to cool said region received in said spline nuts in passing from said inlet through said outlet.