Plastic sleeve encapsulated fastener locking insert and assembly

Claim 1

In an insert assembly for receiving and retaining a screw fastener, the assembly adapted to be mounted by structure closely enveloping the assembly, the combination comprising a. a metallic insert sleeve having an interior thread to receive the fastener thread, the sleeve having a wall portion deformed toward the bore interior defining a thread portion projecting radially inwardly to an extent greater than that of the remainder of the thread so that the sleeve thread develops frictional interference with the fastener thread, and b. a plastic jacket fitting closely about the sleeve and over said deformed portion so as to provide space therebetween for resilient outward expansion of said deformed wall portion in response to advancing reception of the fastener thread into the sleeve thread and despite close envelopment of the jacket by said retention structure, the jacket consisting of heat shrinkable non-metallic plastic material, c. there being two metallic flanges integral with the sleeve projecting radially outwardly therefrom, the flanges located at opposite ends respectively of the jacket closely axially confining the jacket, the flange maximum diameters exceeding the maximum diameter of the jacket, at least one of the flanges defining a multiplicity of annularly spaced outward projections, d. said deformed wall portion locally confined to the midsection of the sleeve between the flanges, and the jacket engaging substantially the entirety of the sleeve outer surface area between said flanges.