Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Headed bolt or screw with threads and complementary nut
Patent
1986-07-29
1990-03-13
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Headed bolt or screw with threads and complementary nut
411414, 411436, F16B 3500, F16B 3504
Patent
active
049079263
ABSTRACT:
A modified buttress thread has a root diameter equal to substantially .sqroot.0.7 of the core diameter with a pitch substantially equal to 1/6 of the core diameter. The thread root extends parallel to the axis of the fastener as a surface and transitions into the thread form at radii at both the load-bearing and trailing flank of the thread. The thread at its maximum diameter has a flat equal to about 0.16 of the pitch. In the fastener system the axial length along a thread form of the collar at radial locations corresponding to the locations on a mating pin are inversely proportional to the strength of the materials of the collar and the pin, for example, when the collar is aluminum and the pin is titanium the lengths are in the ratio of 60:40.
REFERENCES:
patent: 57282 (1866-08-01), Bowers
patent: 2094491 (1937-09-01), Janata
patent: 2207005 (1940-07-01), Haas
patent: 2827820 (1958-03-01), Vellier
patent: 3109672 (1963-11-01), Franz
patent: 3355192 (1967-11-01), Kloesel et al.
patent: 3664540 (1972-05-01), Witkin
patent: 4346920 (1982-08-01), Dailey
WHA Robertson & Co., Ltd., American Machinist World Screw-Thread Forms, Jun. 1961, pp. 93 and 95; FIGS. 17A, 19, 31.
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