Method of manufacturing tee nut

B - Operations – Transporting – 21 – D

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B21D 53/24 (2006.01) B21K 1/70 (2006.01) F16B 37/04 (2006.01)

Patent

CA 2118732

A swollen portion is formed on a metal plate so that a through hole is formed in the forward end surface of this swollen portion, and thereafter a forward end portion of the swollen portion is relatively reduced in outer diameter as compared with a base portion, so that the forward end portion is relatively reduced in thickness. Then, the outer and inner diameters of the base portion are reduced while substantially maintaining its thickness. Thus, the forward end portion defines a relatively thin portion to be caulked, and the base portion defines a relatively thick female screw forming portion. Thus, it is possible to form a shaft portion having a uniform outer diameter and comprising the portion to be caulked having the relatively thin forward end portion for a tee nut in a state held by the metal plate, with application of plastic working.

Une partie saillante est formée sur une plaque de métal de manière à présenter un trou traversant dans son bout avant, et ensuite on réduit relativement le diamètre extérieur du bout avant de la partie saillante par rapport à la base, de sorte que le bout avant est relativement réduit en épaisseur. Puis, on réduit les diamètres extérieur et intérieur de la base, tout en maintenant substantiellement son épaisseur. Ainsi le bout avant définit une partie relativement mince à garnir d'un produit d'étanchéité et la base définit une partie relativement épaisse taraudée. Il est alors possible de former une partie tubulaire dressée à diamètre extérieur uniforme et comprenant la partie à garnir d'un produit d'étanchéité qui a le bout avant relativement mince comme écrou encastré captif de la plaque de métal, avec application d'un produit plastique.

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