Patent ID: 6015283
Filing Date: 2000-01-18
Classification: B29C

Abstract:
In a mold assembly having:(a) a stack of mold plates including a first plate and a second plate movable towards one another and away from one another in opening and closing directions between open and closed positions, and a third plate disposed between said first and second plates; and(b) a plate movement control device comprising at least one linkage including:(1) a traveling element mounted to said third plate for movement along a predetermined path of motion relative to the third plate;(2) a first arm having a first end pivotally connected to the first plate and a second end pivotally connected to the traveling element; and(3) a second arm having a first end pivotally connected to the second plate and a second end pivotally connected to the traveling element, said at least one linkage being arranged so that upon movement of said first and second plates between said closed position and said open position, said third plate moves away from said first plate by a first predetermined distance and moves away from said second plate by a second predetermined distance, said at least one linkage constraining said third plate against rotation around all axes perpendicular to said opening and closing directions.