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US 4,459,073 AGranted
Fasteners with piercing and riveting performance
AssigneeMultifastener Corporation
InventorRudolf R. M. Muller
Life of this patent
Estimating the term…
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AssigneeMultifastener Corporation
InventorRudolf R. M. Muller
Estimating the term…
A self-piercing fastener, such as a stud bolt, for attachment to a panel or the like. The fastener includes a fastener portion, such as a threaded shank, and a self-piercing and riveting end portion. The end portion includes a central recess enclosed by a self-piercing and riveting wall on at least opposed sides of the recess. The wall has an internal surface terminating in a sharp piercing edge at its distal end which is adapted to pierce an opening in the panel. The recess terminates in a bottom wall which is preferably spaced from the piercing edge of the wall a distance greater than the thickness of the panel. The fastener recess receives the slug pierced from the panel, which is deformed against the convex midportion of the bottom wall to engage the internal surface of the wall and the wall includes an arcuate drawing surface at the outer distal end adapted to draw the pierced panel edge toward the distal end of the wall as the panel in pierced, forming a mechanical interlock between the fastener and the panel.
A self-piercing fastener for attachment to a panel or the like,
A self-piercing and attaching bolt for attachment to a panel,
A metal stud member adapted to permanent attachment to a plate which is adapted to be supported on a female die, said stud member comprising a shank and a head at one end of said shank, said head terminating in a non-hardened annular piercing and riveting portion having an open-end portion, said open-end portion having an inner surface and an outer end surface, said annular portion having an outer surface and a recess with said recess terminating in a generally non-planar bottom wall bridging said annular portion, a piercing surface adjacent to the inner surface of said open-end portion adapted to pierce a slug from a plate having a thickness less than the length of said annular portion, said open-end portion adapted to receive said plate slug as said annular piercing and riveting portion penetrates said plate, and said slug being deformed against said bottom wall of said recess, the outer end surface of said open-end portion including an arcuate drawing surface adapted to draw said plate into a female die supporting from said piercing surface to the outer surface of said annular piercing and riveting portion.
A self-piercing and riveting member for attachment to a panel, said member having a body portion, a head portion and a self-piercing and riveting annular wall extending from said head portion, said body portion including a radial flange portion joined to said annular wall in an arcuate surface, said annular wall having a free end spaced from said body portion, an outer surface and a generally smooth inner surface, a piercing surface adjacent said annular wall inner surface free end for piercing a slug from said panel, said annular wall inner surface terminating in a bottom wall bridging said annular wall and defining a socket opening through said annular wall free end for recept of said panel slug, and said annular wall free end joined to said outer surface in an arcuate drawing surface for deforming said panel, and said socket bottom wall being conical and convex for permitting attachment of said member to relatively thin panels wherein said panel slug is compressed against said convex bottom wall, deforming said panel slug radially outwardly against said annular wall inner surface.
Dependencies are inferred from the claim text.