Tacking fastener

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

Patent

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Details

F16B 13/06 (2006.01) B23B 41/00 (2006.01) F16B 4/00 (2006.01) F16B 5/04 (2006.01) F16B 19/10 (2006.01) F16B 19/08 (2006.01)

Patent

CA 2242565

A temporary fastener (10) that fastens two adjacent workpieces (40, 42). The fastener includes a shank (12) that extends through a hole of the workpieces (40, 42). Extending from one end of the shank is a conical shaped head (20). The fastener also contains a pull stem which has a head (28) located adjacent to the blind end of the shank. The stem head (28) is pulled through the shank (12) to expand and tightly fasten the shank (12) to the workpieces (40, 42). The fastener is removed by drilling through the head and the shank. The diameter of the conical shank head is smaller than the diameter of the drill bit (54) so that part of the head (20) does not become attached to the drill bit and scratch the workpiece (40). The conical shape of the head also reduces the volume of the fastener material to further reduce the size and amount of chips produced during the drilling process. The tightly engaged shank prevents the fastener from rotating during the drilling operation.

La présente invention concerne une fixation temporaire (10) permettant de fixer l'une à l'autre deux pièces à usiner (40, 42) adjacentes. Cette fixation comporte un fût (12) qui se place dans un trou des pièces (40, 42). Une tête conique (20) dépasse par l'une des extrémités du fût. La fixation comporte également une tige de traction pourvue d'une tête (28) se plaçant contre l'extrémité aveugle du fût. La traction sur la tête (28) de tige au travers du fût (12) provoque l'élargissement du fût (12) et sa fixation ferme sur les pièces (40, 42). Pour enlever la fixation, on perce un trou au travers de la tête et du fût. Pour que la tête (20) ne vienne pas se prendre sur la mèche et érafler la pièce (40), le diamètre de la tête conique du fût est inférieur au diamètre de la mèche (54). La forme conique de la tête contribue également à réduire le volume de matière de la fixation, ce qui réduit les dimensions et la quantité des copeaux produits pendant l'opération de perçage. Pendant l'opération de perçage, la fixation n'a pas la possibilité d'entrer en rotation, le fût étant fermement emboîté.

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