Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1991-10-31
1993-10-12
Rosenbaum, Mark
Metal working
Method of mechanical manufacture
Assembling or joining
29515, 29520, 411175, 411180, 403285, B23P 1100
Patent
active
052513700
ABSTRACT:
A method of permanently attaching a fastening element, such as a nut or bolt to panels having a range of panel thicknesses, such as the metal panels used by the automotive and appliance industries. The fastening element includes a tubular barrel portion and preferably an annular bearing face surrounding the barrel portion. The method includes punching a hole in the panel, then plasticly deforming and drawing the panel surrounding the hole into a dome or frusto-conically shaped portion. The panel hole is thus enlarged to receive the fastener element barrel portion from adjacent the apex of the frusto-conically shaped panel portion and the bearing face is then driven against the panel, deforming the panel to a generally planar shape. The panel surrounding the hole is thereby driven against the tubular barrel portion which, in the preferred embodiment, includes radially projecting ribs, forming a secure anti-rotation assembly even in very thin panels. Finally, the free end of the barrel portion is deformed radially outwardly and preferably squeezed to form a secure interlock between the fastening element and the panel.
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Babej Jiri
Muller Rudolf R. M.
Hughes S. Thomas
Profil Verbindungstechnik GmbH & Co.
Rosenbaum Mark
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