Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1997-01-17
1998-05-26
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
411448, 411 54, F16B 3504
Patent
active
057555435
ABSTRACT:
An improved machine screw for engaging a correspondingly threaded aperture, comprising a threaded shank having a proximal portion and a distal portion. A head adapted to be rotated may be formed on a shank proximal end opposite the shank distal portion, such that the shank extends axially therefrom. The shank is deformable from a first position to a second position, for either (1) minimizing the contacting surface area between the shank and said aperture, and thereby allowing the machine screw to be easily insertable into said aperture, or (2) maximizing the contacting surface area between the shank and said aperture after the shank has been fully inserted into said aperture, and thereby making the hold between the screw and said aperture more secure. Such deformation of the screw occurs during its insertion into said aperture. It has been found that this deformation prevents screws of the present invention from seating improperly within threads of said aperture. Furthermore, the screw may be formed of a resilient material for allowing it to deform again as it is extracted from said aperture, and even to reform into its original shape after it has been thus extracted. The shank further includes an elongate, open-sided slot extending axially from the shank distal end toward the shank proximal end, for dividing at least a portion of the shank into at least two elongate shank legs.
REFERENCES:
patent: 771336 (1904-10-01), Thomson
patent: 1438648 (1922-12-01), Jacobs
patent: 2024805 (1935-12-01), Place
patent: 2549393 (1951-04-01), Siesel
patent: 4845317 (1989-07-01), Wilson
Saether Flemming
Uland Larry L.
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