Composite fastener

Claim 1

A COMPOSITE FASTENING COMPRISING A NUT BODY OF ESSENTIALLY RIGID SYNTHETIC RESINOUS PLASTIC MATERIAL HAVING AN OPENING THERETHROUGH FOR THREADED ENGAGEMENT WITH A THREADED MEMBER TO CONSTITUTE A THREADED FASTENING MEANS AND HAVING FLAT SURFACES FOR TOOL ENGAGEMENT AND OPPOSITE END FACES TRANSVERSE TO THE AXIS OF SAID OPENING, IN COMBINATION WITH A THIN SHEET METAL NUT ELEMENT MOLDED IN SAID NUT BODY EXTENDING TRANSVERSELY OF SAID OPENING AND SPACED SUBSTANTIALLY GREATER DISTANCES FROM SAID OPPOSITE END FACES THAN THE THICKNESS OF SAID ELEMENT, SAID ELEMENT HAVING AN OPENING AT LEAST AS LARGE AND AXIALLY ALIGNED WITH THE OPENING IN SAID NUT BODY FOR ENGAGEMENT WITH THE THREADED MEMBER, THE AREA OF SAID SHEET METAL ELEMENT BEING SUBSTANTIALLY LESS THAN THE CROSS SECTIONAL AREA OF OF SAID NUT BODY AND SAID METAL ELEMENT HAVING APERTURES THERETHROUGH SPACED FROM SAID OPENING SO THAT PORTIONS OF SAID NUT BODY ON OPPOSITE SIDES OF SAID SHEET METAL ELEMENT ARE CONNECTED THROUGH SAID APERTURES AND ON THE SIDES OF SAID METAL ELEMENT TO FORM SAID NUT BODY AND ENGAGE SAID METAL ELEMENT TO PREVENT RELATIVE ROTATION, SAID COMPOSITE FASTENER BEING SYMMETRICAL ABOUT A TRANSVERSE MEDIAN PLANE, SAID PLASTIC NUT BODY IN CONTACT WITH THE FACES OF SAID SHEET METAL NUT ELEMENT LIMITING DISTORTION OF SAID SHEET METAL NUT ELEMENT TO MAINTAIN SAID SHEET METAL NUT ELEMENT IN ENGAGEMENT WITH THE THREADS OF SAID THREADED MEMBER AND SAID METAL NUT ELEMENT EXERTING COMPRESSIVE FORCE ON SAID PLASTIS NUT BODY TO INCREASE THE ENGAGEMENT BETWEEN SAID PLASTIC NUT BODY AND THE THREADS OF THE THREADED MEMBER, SO AS TO INCREASE THE RESISTANCE OF SAID FASTENER TO THE TORQUE PRODUCED ON RELATIVE ROTATION TO TIGHTEN SAID FASTENER ON THE THREADED MEMBER.