Self-drilling screw

F - Mech Eng,Light,Heat,Weapons – 16 – B

Patent

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Details

F16B 25/10 (2006.01) B21H 3/02 (2006.01) F16B 35/04 (2006.01)

Patent

CA 2125357

A self-drilling screw is provided which is suitable for use with both thick section metal plate and thin section metal sheet. The screw is formed from a blank 1 which includes a shank 2 extending between a head 3 and drilling top 4. The shank 2, adjacent the head 3, is formed with a frusto-conical enlargement 8. A thread 10, when formed in shank 2 is extended into enlargement 8 to create a final part 11 of the thread which, in use of the screw with sheet metal 12, distorts the sheet metal such that it firmly locks onto the enlargement 8. A shallow recess 6 is provided in the underside of head 3 surrounding the frusto-conical enlargement 8.

Une vis « autovissant » est offerte qui s'emploie tant pour des plaques en métal épaisses qu'avec des feuilles de tôle mince. La vis est fabriquée à partir d'un blanc 1, qui comprend une tige 2 qui s'étend de la tête 3 jusqu'à la pointe 4. La tige 2, près de la tête, comporte un agrandissement frusto-conique 8. Le filet 10, de sa naissance dans la tige 2, se prolonge jusqu'à l'agrandissement 8, pour créer une dernière section 11 du filet, qui, lorsque la vis s'emploie sur de la tôle en feuille 12, tord le métal de telle façon à ce qu'il s'attache solidement à l'agrandissement 8. La face de dessous de la tête 3, avoisinant l'agrandissement frusto-conique, comporte une rainure peu profonde.

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Profile ID: LFCA-PAI-O-2006239

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