Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1980-05-21
1982-04-13
Moon, Charlie T.
Metal working
Method of mechanical manufacture
Assembling or joining
29175R, 403 48, 411190, 411423, 411436, 411389, B23P 1100, F16B 3900
Patent
active
043240364
ABSTRACT:
An orthodontic screw-type biassing device comprises: a first member having an internally threaded bore, the threaded bore comprising first and second threaded portions adjacent each other in the axial direction of the bore, the first and second threaded portions having thread roots which lie substantially on a common line, the first threaded portion having threads of given depth and the second threaded portion having threads of a lesser depth. A threaded inner screw-type member is threadably engaged in the internally threaded bore of the member, the threads at an end portion of the inner screw member being deformed so as to freely, threadably pass through the second threaded portion of the threaded bore and to bind and be non-rotatable in the first threaded portion of said threaded bore. The invention is also directed to a method of making such a biassing device.
REFERENCES:
patent: 1765595 (1930-06-01), Leuan
patent: 2064342 (1936-12-01), England
patent: 2900203 (1959-08-01), Hayden
patent: 3065983 (1962-11-01), Flumerfelt
patent: 3496800 (1970-02-01), Brezinski
patent: 3526951 (1970-09-01), Witsenhausen-Adelmann
patent: 3832778 (1974-09-01), Wallshein
patent: 4107843 (1978-08-01), Spino et al.
patent: 4114250 (1978-09-01), Dent
patent: 4200979 (1980-05-01), Wallshein
Moon Charlie T.
Quanta Chemical Ltd.
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