| 摘要 |
964,402. Jointing by forging; perforating. MULTIFASTENER CORPORATION. Feb. 4, 1963 [March 14, 1962], No. 4426/63. Headings B3H and B3W. [Also in Division F2] In an assembly wherein a pierce nut 22 having a pilot portion 26 projecting through an aperture 23 in a sheet metal panel 21 and a laterallyprojecting shoulder 35 against which the panel is positioned, the end face 25 of the nut has an undercut groove 30 outwardly of the threaded aperture 23 the nut being secured to the panel by displacing into the nut groove only a portion of the panel overlying the groove which has been severed by the nut. The nut is used to punch the panel in co-operation with a die button 40, the nut being moved relatively to die button with the panel 21 interposed therebetween. The die button 40 has a central aperture 39 and a pair of elongated projections 45, each provided with a pair of longitudinally spaced sharpened shearing edges 46 which co-operated with piercing edges 28 of the nut pilot portion 26 to sequentially pierce the panel and then swage or othersise deform the panel into the nut groove 30. The die button has arcuate surfaces radiused respectively longitudinally and transversely of the panel so that only the spaced longitudinal portions 50 of the severed length are swaged in the grooves. The joining portions 51 are deflected to project through the mouths of the groove to join the severed portions 50 to the non-deformed portions of the plate. The parallel cutting edges 41 of the die button 40 punch through the panel at 42, Fig. 2, and displace the panel 21 downwardly relatively to the nut, displacing the nut material beneath the panel. In a modification, Figs. 6-11 (not shown), only a single medial portion of the panel is deflected into the nut groove following piercing. Specification 783,220 is referred to. |
