Method for injection molded rivet style fastener and housing with snap assembly functionality along with an injection molding process for producing such a rivet without an undercut feature

A method for forming and installing a fastener, comprising the steps of:

• forming an engaging portion having a projecting stem which is interiorly hollowed over at least an intermediate extending range, the stem including a solid end most extending portion;
• forming a receiving portion having a surface, within which is configured an inner rim defined edge, a diameter of an aperture between the rim edge being less than a diameter of the stem;
• constructing the receiving portion of a material having a greater flexibility than the engaging portion and so that the rim edge experiences a majority of deformation in response to insertion of the engaging portion;
• pressing the solid end most extending portion of the engaging portion through the inner rim edge of the receiving portion;
• and
• aligning with the inner rim edge a location of the interiorly hollowed portion of the stem, causing inward collapsing of the aligned location by the rim edge to secure the engaging portion to the receiving portion.

A method for forming and installing a fastener, comprising the steps of:

• forming an engaging portion having a projecting stem which is interiorly hollowed over at least an intermediate extending range, the stem including a solid end most extending portion;
• forming a receiving portion having a surface, within which is configured an inner rim defined edge, a diameter of an aperture between the rim edge being less than a diameter of the stem;
• constructing the receiving portion of a material having a similar stiffness and flexibility as the engaging portion and so that both the rim edge and the engaging portion experience a degree of deformation in response to insertion of the engaging portion
• pressing the solid end most extending portion of the engaging portion through the inner rim edge of the receiving portion;
• and
• aligning with the inner rim edge a location of the interiorly hollowed portion of the stem, causing inward collapsing of the aligned location by the rim edge to secure the engaging portion to the receiving portion.