B - Operations – Transporting – 23 – Q
Patent
B - Operations, Transporting
23
Q
B23Q 3/14 (2006.01) B21F 5/00 (2006.01) B21K 1/60 (2006.01) F16B 19/10 (2006.01)
Patent
CA 2126114
ABSTRACT OF THE DISCLOSURE A mandrel (15) inserted in a rivet body (11) to form a blind rivet (10) has a head (17) extending from a rod- shaped mandrel body (16). The head formed to have a plane top surface (18) perpendicular to the mandrel body, has a diameter 'D' almost equal to the outer diameter of rivet body, and a height 'H' of 80 % to 100 % of the mandrel body's diameter 'd'. A frustum-shaped low protrusion (19) formed centrally of and on the top sur- face has an upper surface (20) of a diameter 'd1' slight- ly greater than the diameter 'd'. A conical or other- wise curved surface (21) of the mandrel head applies a force to an open end of rivet body (11) in a self-centri- petal manner when the force is imparted to the mandrel body to caulk or deform the open end, so that a uniform caulking is effected, with the head being retained not to slip off the caulked rivet body whose length is notice- ably reduced. An apparatus, if installed in a nailery machine, enables the easy production of the mandrel in the same manner as the prior art mandrels.
Kirby Eades Gale Baker
Yugenkaisha Shinjo Seisakusho
LandOfFree
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