Method of manufacturing split ring springs for snap fasteners

Details Method of manufacturing split ring springs for snap fasteners Method of manufacturing split ring springs for snap fasteners

1987-10-19

1989-03-07

Crane, Daniel C.

Metal deforming

With cutting

By shearing tool-couple

72339, 72403, 140 88, 24674, B21F 3702, B21F 4516

Patent

active

048095320

ABSTRACT:
A split ring spring for snap fasteners has a burr extending from each end of the ring spring in a direction parallel to the imaginary central axis of the ring spring. When a stud member is snapped with a socket member in which the split ring spring is incorporated, the burrs do not damage or scar a body of the stud member. The ring spring having such unobjectionable burrs is produced by feeding a length of a strip of resilient material transversely across a mandrel, then severing the length off the strip in a direction parallel to the longitudinal axis of the mandrel while holding the length on the mandrel, and thereafter bending the severed length of strip around the mandrel.

REFERENCES:
patent: 1244448 (1917-10-01), Berg
patent: 1417397 (1922-05-01), Lewis
patent: 1936611 (1933-11-01), Young
patent: 1973436 (1934-09-01), Hjort
patent: 3166827 (1965-01-01), Bushi
patent: 4621515 (1986-11-01), Sanderson et al.

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