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US 5,174,018 AGranted
Die button with staking features
AssigneeMultifastener Corporation
InventorR. M. Muller
Life of this patent
Estimating the term…
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AssigneeMultifastener Corporation
InventorR. M. Muller
Estimating the term…
An improved die member and method of attaching a self-piercing and riveting fastener to a panel wherein a slug pierced from the panel by the riveting fastener is securely staked in the barrel portion of the fastener during the installation of the fastener. The staking method includes driving a plurality of staking projections into said slug, thereby pinching said slug between the projections and a barrel side wall. This pinching action causes the slug to deform outwardly and lodge between the side walls of said fastener. The staking projections are preferably arranged around the perimeter of the die post, and in a most preferred embodiment, the projections have a canted side wall proximal the wall, forcing a portion of said slug toward the barrel side wall, when said slug is pinched between said canted side wall and a bottom wall of said fastener.
A die member for attaching self-piercing and riveting fasteners to a panel, said fasteners each including an annular barrel portion having barrel side walls which define an opening into said barrel, a bottom wall joining said side walls opposite said opening and a piercing surface adjacent said barrel opening, said die member having an annular concave die cavity surrounding a projecting central die post, said die post configured to receive said fastener annular barrel portion, said annular concave die cavity having a generally smooth annular concave surface and said central die post having a free end including an outer peripheral piercing surface configured to be received in said barrel opening, said die post piercing surface cooperating with said piercing surface of said barrel portion to pierce said panel, said die post having a plurality of spaced staking projections placed radially inwardly from said piercing surface of said die post, said spaced staking projections each adapted to deform a portion of said slug, thereby urging said slug portion against said barrel walls causing said slug to be retained in said barrel portion of said fastener.
A die member for attaching self-piercing and riveting fasteners to a panel, said fasteners each including an annular barrel portion having barrel side walls which define an opening into said barrel, a bottom wall joining said side walls opposite said opening and a piercing surface adjacent said barrel opening, said die member having an annular concave die cavity configured to receive said fastener annular barrel portion surrounding a projecting central die post, said annular die cavity having a generally smooth annular concave surface, said die post having a free end having internal walls defining a central bore for routing trapped air, and a generally planar top surface which is bounded by a piercing surface, said top surface and said piercing surface adapted to be received in said barrel opening, said die post top surface including a plurality of circumferentially spaced staking projections extending out from said die post surface, said projections spaced radially inwardly from said piercing surface, wherein each one of said plurality of staking projections includes first and second canted side walls and a top wall, said piercing surface of said die post cooperating to pierce a slug from said panel, said die post then driving said panel slug into said barrel opening and against said barrel bottom wall, said projections penetrating into said slug and causing a portion of said slug to outwardly deform, thereby lodging said slug within said barrel.
A die for attaching self-piercing and riveting fasteners to a panel, said fasteners of the type including an annular barrel portion having barrel side walls which define an opening into said barrel, said barrel side walls adjacent said opening defining a piercing surface, said barrel portion further including a bottom wall joining said barrel side walls opposite said opening, said die comprising:
Dependencies are inferred from the claim text.