Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Headed fastener element with securing means and biasing spring
Patent
1989-02-09
1990-01-16
Gall, Lloyd A.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Headed fastener element with securing means and biasing spring
24297, 24590, 403348, 411508, F16B 2100
Patent
active
048939781
ABSTRACT:
A twistlock fastener is constructed of a latching member and a base member. The base member has a socket portion with a square-shaped internal bore. The latching member is formed with head portion and a shank portion. The shank portion has a cylindrical section adjacent to the head portion and has a pair of resilient bifurcated leg elements integrally formed with the cylindrical section. Each of the leg elements have a radial surface to provide a latching shoulder. Each latching lateral shoulder is formed with a width sufficient to retain the shank portion in the square-shaped internal bore. Each of the opposite side surfaces at the opposite ends of the latching shoulder for both leg elements lie in a common flat plane which is perpendicular to the latching shoulders. The surface on each of the leg elements that extends axially from and adjacent to each latching shoulder is flat, and the corner surfaces along each of the leg elements adjacent to each of the opposite side surfaces are rounded along the length of the leg elements.
REFERENCES:
patent: 3186049 (1965-06-01), Fiddler
patent: 3220078 (1965-11-01), Preziosi
patent: 4262394 (1981-04-01), Wright
patent: 4652192 (1987-03-01), Schaller
patent: 4740026 (1988-04-01), Wagner
Buckman Thomas W.
Gall Lloyd A.
Illinois Tool Works Inc.
O'Brien John P.
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