Method of installing a fastener
The present invention relates to an improved die member, panel and fastener assembly and method for installing a fastener into a panel. The die member has a pair of opposed clinching lips protruding from an end face. The opposed clinching lips have a contact face that narrows as it approaches the opposed ends of the contact face and sidewalls that are angled with respect to vertical. The lips, due to the dual angles, substantially and simultaneously drive panel metal into fastener grooves both longitudinally and laterally. The fastener and panel assembly have panel metal deformed into the fastener grooves resulting in generally wedge-shaped portions of panel metal in the opposed ends of the fastener grooves.
1. A method of attaching a fastener to a deformable metal panel, said fastener having generally parallel channel-shaped grooves, each groove having a bottom wall, opposed side walls, a mid-portion and opposed open end portions, said method comprising the following steps:
locating said panel on a die member including an end face, an opening through said end face and generally parallel lips adjacent said opening projecting from said end face, each of said lips including a contact face, a mid-portion having a width less than a width of said grooves and opposed end portions having a width less than said mid-portion;
locating said fastener opposite said panel with said fastener grooves aligned with said lips of said die member;
driving said fastener against said panel, thereby driving said lips of said die member against said panel and said lips driving portions of said panel into said grooves and against said bottom wall; and
further driving said contact face of said lips against said panel on said bottom wall of said grooves and said mid-portion of said lips deforming said panel longitudinally toward said open end portions of said grooves and laterally toward said side walls of said grooves.
2. The method of attaching a fastener to a deformable metal panel as defined in claim 1 , wherein said method includes deforming said panel portions in said fastener grooves laterally to a greater extent as said panel portions approach said open end portions of said grooves, forming opposed wedge-shaped bottom walls in said panel portions engaging a bottom wall of said fastener grooves and said sidewalls at said grooves.
3. The method of attaching a fastener to a deformable metal panel as defined in claim 2 , wherein said method includes deforming said bottom walls of said panel portions laterally from adjacent said mid-portion of said grooves, forming opposed wedge-shaped portions extending from adjacent said mid-portions of said grooves.
4. The method of attaching a fastener to a deformable metal panel as defined in claim 2 , wherein said method includes deforming said bottom walls of said panel portions laterally from a location spaced from said mid-portion of said grooves, forming opposed wedge-shaped portions adjacent said open end portions of said grooves.
5. The method of attaching a fastener to a deformable metal panel as defined in claim 1 , wherein at least one of said groove side-walls of each of said grooves is inclined inwardly, said method including forming said panel portion laterally beneath said inclined side-walls of said grooves.
6. A method of attaching a fastener to a deformable metal panel, said fastener having generally parallel channel-shaped grooves, each groove having a bottom wall, opposed side walls, a mid-portion and opposed open end portions, said method comprising:
locating said panel on a die member having spaced generally parallel projecting lips configured to be received in said fastener grooves said lips each including a mid-portion and opposed end portions and said mid-portion having a greater width than said end portions;
locating said fastener opposite said panel with said fastener grooves aligned with said die member lips;
driving said fastener against said panel, thereby driving said die member lips into said fastener grooves and deforming portions of said panel into said fastener grooves against said bottom walls of said grooves; and
said lips of said die member driving said panel portions in said fastener grooves and against said bottom wall of said grooves and longitudinally toward said opposed end portions of said lips and said open end portions of said grooves and laterally toward said side walls of said grooves adjacent said open end portions forming opposed generally wedge-shaped bottom walls in said panel portions engaging said bottom wall of said grooves.
7. The method of attaching a fastener to a deformable metal panel as defined in claim 6 , wherein said method includes deforming said bottom walls of said panel portions laterally from adjacent said mid-portion of said grooves, forming said opposed wedge-shaped portions in said bottom walls of said panel portions extending from adjacent said mid-portion of said grooves.