F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
F16B 25/00 (2006.01)
Patent
CA 2623850
A self-tapping screw for jointing fiberboard comprises a screw head and a screw shank. It may include additionally screw tip. A threading portion is provided on a part of the screw shank or the entire screw shank. Any cross- section of the threading portion forms a polygon, such as pentagon, hexagon or heptagon. The points of the cross-section are lobes and at the same circumference. The threading portion forms spiral multi-prism construction. Due to the polygonal cross-section, the threading and the board contact through points and the contacting area between them is reduce. The spiral multi-prism construction makes bits be discharged more easily. The results is that the self-tapping screw in the invention is more laborsaving and rapidly than traditional self-tapping screw.
La présente invention concerne une vis autotaraudeuse servant à assembler un panneau de fibres, qui comprend une tête de vis ainsi qu~une tige de vis et éventuellement une pointe de vis. Une partie filetée est disposée partiellement ou intégralement sur la tige de vis. Toute section transversale de la partie filetée forme un polygone, tel un pentagone, un hexagone ou un heptagone. Les points de la section transversale forment des lobes possédant la même circonférence. La partie filetée forme une construction en spirale à prismes multiples. La section transversale polygonale réduit les points de contact entre le filetage et le panneau ainsi que leur surface de contact commune. La construction en spirale à prismes multiples permet d~évacuer plus facilement les résidus. La vis autotaraudeuse de cette invention permet ainsi de dépenser moins d~énergie et de travailler plus rapidement qu~avec une vis autotaraudeuse classique.
Aironware (shanghai) Co. Ltd.
Miltons Ip/p.i.
LandOfFree
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