US Patent 7874779 Fasteners, fastener components and fastener receptacles

Fasteners, fastener components and fastener receptacles, including quarter-turn fasteners may use a receptacle body having a non-metal material and one or more fastener engagement structures that together define a non-circular passage in the body. Underneath the fastener engagement structures, one or more support structures extend inwardly under the corresponding fastener engagement structures for supporting the underside of the fastener engagement structures. The support structures can have a concave configuration relative to an axis of the body. Additionally, a support structure can be co-extensive with the corresponding fastener engagement structure.