Gencorp, Inc.

John C White

Robert L Brown

David E Baxter

Michael K Parrent

A self-clamping mold assembly for injection molding articles from material cured by the application of temperature and pressure. The assembly includes a mold body and a lock mechanism housed within the body. The body has aligned, independent plates, each having a mold cavity and a lock bore portion with a central axis. The lock mechanism includes a tie rod assembly for engagement with one of the independent plates, and a force generator assembly for engagement with another of the independent plates. The tie rod and force generator assemblies are engaged with the lock bore portion of the plates. The tie rod assembly includes a tie rod adapted for rotatable engagement within the mold assembly, and the force generator assembly includes a lock shaft adapted for locking engagement with the tie rod and a spring biased member retained with respect to the lock shaft. Upon locking engagement of the tie rod with the lock shaft compressing the spring biased member, the independent plates are maintained in clamped condition for the injection of molding material.

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Cuyahoga Falls, OH, United States of America

John C White