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Method of attaching a fastening element to a panel
| Details |
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Inventors: Muller, Rudolf R. M.; Babej, Jiri;
Assignee: Profil Verbindungstechnik GmbH & Co. (DE)
Primary Examiner: Rosenbaum; Mark
Assistant Examiner: Hughes; S. Thomas
Attorney, Agent or Firm: Howard & Howard
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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DETAILED DESCRIPTION The improved method of attaching a fastening element to a panel of this invention is particularly, but not exclusively adapted for permanent installation of fastening elements in plasticly deformable metal panels having a range of panel thicknesses utilized in mass production applications, such as the automotive industry.
The fastening element may be a female fastening element, such as a nut, or a male fastening element, such as a stud, bolt or the like.
The fastening element includes a generally tubular barrel portion and preferably includes a body portion having a bearing surface surrounding the tubular barrel portion.
The method of this invention includes forming a hole through the panel which is to receive the fastening element.
The method further includes drawing and plasticly deforming the panel into a generally dome-shaped or frusto-conical shaped portion surrounding the hole.
The inside diameter of the hole is thus large enough to loosely receive the tubular barrel portion of the fastening element.
The method then includes inserting the tubular barrel portion of the fastening element through the panel hole, preferably from adjacent the apex of the frusto-conical or dome-shaped portion and the method then includes plasticly deforming the panel to a generally planar shape, thereby reducing the diameter of the hole to a diameter which is less than the external diameter of the tubular barrel portion.
The panel surrounding the hole is thus driven into the tubular barrel portion, increasing the torque required to rotate the fastening element in the hole.
Finally, the method includes plasticly deforming the free end of the barrel portion radially outwardly, forming a mechanical interlock between the panel and the fastening element.
In the most preferred method of this invention, the panel hole is formed by punching the panel with a cylindrical punch while the panel is supported on a die member.
The panel is thus simultaneously drawn and deformed into the die member and punched, forming the dome or frusto-conical shaped portion of the panel surrounding the hole
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Metal Working 
