Assembly for clamping mold to platens of injection-molding machine

In an injection-molding machine, the improvement which comprises in combination:

• a pair of separable mold halves jointly defining a mold cavity and having oppositely directed sides each formed with a respective projection along an axis, each of said projections having an annular flange defined by an outwardly open annular groove separating the respective flange from the respective side, each flange having a beveled camming surface defining a flank of the respective groove;
• a pair of relatively movable platens on said machine spaced apart along said axis and receiving said mold halves between them, each of said platens having a bore receiving a respective one of said projections;
• respective gripper means on each of said platens engageable with the projection of a respective mold half for form-locking and force-locking retention thereof on the platen, each of said gripper means including:
• a plurality of sliding members reciprocatingly shiftable on the respective platen toward and away from said axis and engageable in the groove between the flange and said side of the respective mold half;
• means for displacing said sliding members on the respective platen for engaging and releasing the respective projection, selectively, and
• further beveled camming surfaces on said members engageable with the said camming surface of the respective flange to press said side of the respective mold half against the respective platen.