Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1980-11-07
1983-06-14
Combs, Ervin M.
Metal working
Method of mechanical manufacture
Assembling or joining
29520, 29525, 411105, B23P 1100, B23P 1902
Patent
active
043874975
ABSTRACT:
A cylindrical bushing is positioned over the shank of a screw member prior to forming threads on the shank. After the threads are formed, the outside diameter of the threads is greater than the inside diameter of the bushing so that the bushing is held captive on the shank of the screw. A cylindrical sleeve is then inwardly deformed so as to be permanently secured to the bushing. The opposite end of the sleeve facing away from the head of the screw shank extends beyond the bushing and forms a skirt which can be peened over the peripheral inner edge of a panel opening to secure the sleeve to the panel, thereby holding the screw captive to the panel. The end of the bushing next to the underside of the screw head has an increased internal diameter portion for accommodating a spring serving to bias the head and shank away from the bushing so that when the screw is unfastened, it will pop outwardly and release quickly any member to be secured to the panel.
REFERENCES:
patent: 3218906 (1965-11-01), Dupree
patent: 3368602 (1968-02-01), Boyd
patent: 3571904 (1971-03-01), Gulistan
patent: 3577850 (1971-05-01), Harris et al.
patent: 4117261 (1978-09-01), Blevins et al.
patent: 4236562 (1980-12-01), Molina
Combs Ervin M.
Nichols Steven E.
Pastoriza Ralph B.
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