Chain – staple – and horseshoe making – Chains – Ornamental
Patent
1990-01-02
1991-03-05
Jones, David
Chain, staple, and horseshoe making
Chains
Ornamental
59 3, 59 83, B21L 502
Patent
active
049968351
ABSTRACT:
A jewelry rope chain having tightly interfitting links made of wire of a given cross-section, each link having a small gap formed therein slightly larger than the cross-section of said wire, so as to enable one of said links to pass through the gap of a second such link, said links being intertwined to fit tightly one against the other and form in outward appearance a double helix, the improvement being that each link comprises a non-circular geometric shape, said shape comprising a major axis defining long outer and inner diameters and a minor axis defining shorter outer and inner diameters, said gap lying in a link section parallel to the major axis and said shorter inner diameter being just over X times greater than the cross-section of the link wire, where X is a number equal to or greater than 3.
REFERENCES:
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patent: 979110 (1910-12-01), Ungerer et al.
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patent: 1053726 (1913-02-01), Hamm et al.
patent: 1055751 (1913-03-01), Hurley
patent: 1886784 (1932-11-01), Boppenhausen
patent: 4493183 (1985-01-01), Bucefari et al.
patent: 4503664 (1985-03-01), Allazzetta et al.
patent: 4651517 (1987-03-01), Benhamou et al.
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