Jewelry rope chain

Details Jewelry rope chain Jewelry rope chain

1985-08-15

1987-03-24

Spruill, R. L.

Chain, staple, and horseshoe making

Chains

Ornamental

59 16, 59 3, 59 20, B21L 502

Patent

active

046515178

ABSTRACT:
The disclosure sets forth a different annular link as the building element; instead of using a split annular link of a 3:1 ratio of link inner diameter to major wire diameter, the link has substantially thinner annulus for forming the rope chain, an annulus that requires an over 5:1 ratio of inner annulus diameter to major wire diameter. The presently preferred ratio is between 5.2 and 5.7:1. It is possible to use even thinner annuluses, i.e. having greater ratios, e.g., 7.2-7.7:1 with even greater weight savings (approximately 35%), or other even greater odd-numbered ratios of inner annulus diameter to major wire diameter (e.g. 9.4-9.9:1). Thus, while there is no theoretical limit, there is probably a maximum practical upper limit to the ratio of inner annulus diameter to major wire diamater.

REFERENCES:
patent: 848299 (1907-03-01), Feid
patent: 944640 (1909-12-01), Ungerer et al.
patent: 979110 (1910-12-01), Ungerer et al.
patent: 1053726 (1913-02-01), Hamm et al.
patent: 1886784 (1932-11-01), Boppenhausen
patent: 4493183 (1985-01-01), Bucefari et al.
patent: 4503664 (1985-03-01), Allazzetta et al.
"Oroamerica", `The Chain with the Heart`, pp. 1-48, (no date).

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