Method for producing hollow jewelry ring

  • US 6,032,719 A
  • Filed: 08/26/1998
  • Issued: 03/07/2000
  • Est. Priority Date: 12/13/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of producing a hollow metal jewelry ring, the method comprising the steps of:

  • providing a mold having a first mold cavity shaped in accordance with an external shape of the ring to be produced;

    providing a core insert formed of a soluble material, said core insert having a shape in accordance with, but slightly smaller than, a portion of the ring to be produced;

    positioning the core insert in the first mold cavity;

    introducing a molten material into the first mold cavity to surround the core insert and fill the first mold cavity, and hardening the molten material to form a replica of the ring to be produced;

    removing the replica from the first mold cavity;

    removing the core insert from the replica to leave a hollow space within the replica;

    after said removing steps, forming a second mold cavity in an investment material using the replica; and

    casting the hollow metal jewelry ring in the second mold cavity;

    wherein the first mold cavity and the core insert each have an arcuate portion, the arcuate portion of the core insert having an arcuate extent of at least 140°

    .

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