F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
F16B 33/02 (2006.01) F16B 25/00 (2006.01) F16B 25/04 (2006.01) F16B 35/06 (2006.01) F16B 39/282 (2006.01)
Patent
CA 2234860
In a fastener having a head, which may have having torque-absorbing ribs, and a shank, which is unitary with the head and which hasa primary thread formation and a secondary thread formation. The primary thread formation, which defines axially spaced threads along a generally cylindrical portion of the shank and along a tapered tip of the shank, has a generally uniform radial dimension along the generally cylindrical portion of the shank. The secondary thread formation, which defines axially spaced threads between some of the threads defined by the primary thread formation, originates at a region spaced axially from the distal end of the generally cylindrical portion of the shank, terminates at the head, and tapers outwardly from the region where it originates toward the head. The secondary thread formation at the region adjoining the head has a radial dimension less than the generally uniform radial dimension of the primary thread formation along the generally cylindrical portion of the shank. The region where the secondary thread formation originates is located between the proximal and distal ends of the generally cylindrical portion of the shank.
Cette invention concerne un dispositif de fixation à tête pouvant présenter des côtes anti-dévissage et à tige fabriquée d'un seul venant avec la tête et comportant un filetage primaire et un filetage secondaire. Les filets du filetage primaire sont répartis axialement sur une partie sensiblement cylindrique et sur une partie terminale conique de la tige, ceux de la partie cylindrique ayant une dimension radiale sensiblement uniforme. Le filetage secondaire, dont les filets sont intercalés entre certains des filets du filetage primaire, commence à un point situé à une certaine distance de l'extrémité distale de la partie sensiblement cylindrique de la tige et se termine à la tête. Ce filetage augmente de diamètre entre son point d'origine et le point de jonction avec la tête. Au point de jonction avec la tête, le filetage secondaire présente une dimension radiale inférieure à la dimension radiale sensiblement uniforme du filetage primaire sur la partie sensiblement cylindrique de la tige. Le point de départ du filetage secondaire est situé entre l'extrémité proximale et l'extrémité distale de la partie sensiblement cylindrique de la tige.
Barth Gerald D.
Bechtel Frank W.
Finlayson & Singlehurst
Illinois Tool Works Inc.
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