Abstract: A picture frame assembly incorporates an outer frame and a backing member having at least one laterally extending resilient groove engaging edge protrusion that cooperates with a receiving groove circumscribed, formed, or cast in a back picture opening rabbet return of the outer frame to secure an artwork within the picture frame assembly. Preferably, the backing member has a plurality of resilient groove engaging edge protrusions with each resilient groove engaging edge protrusion cooperating with a receiving groove to secure an artwork within the outer frame. In use, each laterally extending resilient groove engaging edge protrusion is laterally compressed and then rebounds into close engagement with the receiving groove whereby the backing member is secured within the outer frame behind the artwork.

Abstract: A picture frame assembly incorporates at least one angled slotted shim tab and preferably a plurality of angled slotted shim tabs each movably mounted on a backing member of the picture frame assembly and with each shim tab cooperating with a shim tab receiving groove circumscribed, formed, or cast in a back picture opening rabbet return of an outer frame of the frame assembly to secure an artwork within the outer frame. In use, the angled slotted shim tab is pressured into close engagement with the shim tab receiving groove by an angled slot in the shim tab acting against outer portions of a threaded insert mounted transversely in the backing member near its outer edge and a capscrew that is threaded through the angled slot and tightened to secure the shim tab to the backing member.