Fastener system for attaching cushions to chairs

Claim 1

A fastener assembly for releasably securing an item in place upon a mounting member having an aperture of ovaloid shape, said assembly comprising: a backing sheet presenting a face and an apertured boss extending outwardly from said face for receipt within said mounting member aperture, said boss including inboard wall structure presenting a passageway, an out-board portion presenting structure having an ovaloid shape corresponding to the shape of the aperture of the mounting member, and obliquely oriented lip means extending inwardly from said wall structure into said passageway, said inboard wall structure and lip being formed of resilient, deformable synthetic resin material; and a threaded member having a head and an elongated, helically flighted shank extending from the head and presenting adjacent root and crest structures, said shank being received in said boss aperture by application of an axial pushing force on said head, with said inboard wall structure and lip deforming and expanding resiliently and radially outwardly under the influence of said pushing force to accommodate said shank, and with the inboard wall structure and lip resiliently moving inwardly when the shank is seated within the passageway for locking interengagement between the lip and said root and crest structure, said head engaging the face of said mounting member remote from said backing sheet for holding the backing sheet in place upon the mounting member, said root and crest structure, and said lip means being cooperatively configured for release of said threaded member from said boss by rotation of the threaded member.