Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Design of fastener or substructure restricts rotation
Patent
1978-09-11
1981-03-10
Britts, Ramon S.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Design of fastener or substructure restricts rotation
411260, 411277, 411285, 411308, 411500, F16B 3902, F16B 3500
Patent
active
042548098
ABSTRACT:
A two-piece rivet assembly comprising a shank member and a collar. The shank member includes a head, a cylindrical shank, and a helical thread with a substantially constant pitch, but with a crest diameter which decreases as it extends away from a maximum adjacent to its end farthest from the shank. The ring-like collar has an inner wall, an outer wall, and a first and a second end. The inner wall defines a passage between the ends to receive at least a portion of the thread. With the shank placed in an aperture in a workpiece with at least a portion of the thread projecting beyond a surface of the workpiece, the collar is placed over the thread and a swaging setting force is applied. This force applies both axial and radial components to the collar. This forces the collar against a surface of the workpiece and swages the wall into the thread at its maximum diameter and then continuously along the thread, exerting a tensile force on the shank member.
REFERENCES:
patent: 1926925 (1933-09-01), Wescott
patent: 2059853 (1936-11-01), Daiber
patent: 2396661 (1946-03-01), Keller et al.
patent: 2955505 (1960-10-01), Schuster
patent: 3290982 (1966-12-01), Marschner
patent: 3560124 (1971-02-01), Bergere
patent: 3587701 (1971-06-01), Gold et al.
patent: 3915053 (1975-10-01), Ruhl
patent: 4054045 (1977-10-01), King
Britts Ramon S.
Hi Shear Corporation
Mon Donald D.
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