Plastic nut with metallic thread engaging inserts

Claim 1

A NUT ADAPTED FOR USE WITH A STUD HAVING A PREDETERMINED MAJOR DIAMETER, SAID NUT COMPRISING A BODY OF SYNTHETIC RESINOUS PLASTIC MATERIAL HAVING A BORE DEFINED BY AN INTERNAL CYLINDRICAL WALL, THE DIAMETER OF SAID BORE BEING LESS THAN SAID MAJOR DIAMETER OF SAID STUD, AND A PLURALITY OF SEPARATE, STRAIGHT METAL INSERTS WITHIN THE BODY OF SAID NUT CIRCUMFERENTIALLY AND AXIALLY SPACED THEREIN AND EACH EXTENDING IN A GENERALLY RADIAL DIRECTION WITH RESPECT TO THE AXIS OF SAID INTERNAL CYLINDRICAL WALL, EACH OF SAID INSERTS HAVING A THREAD-ENGAGING INNER END PORTION POSITIONED ADJACENT SAID INTERNAL CYLINDRICAL WALL AND BEING SPACED FROM SAID AXIS BY A DISTANCE EQUAL TO LESS THAN ONE-HALF SAID MAJOR DIAMETER OF SAID STUD BUT, BY A DISTANCE AT LEAST EQUAL TO THE SPACING OF SAID INTERNAL WALL FROM SAID AXIS, THE INNER END POSITION OF EACH INSERT BEING FORMED AS A CUTTING EDGE WHEREBY SAID INTERNAL WALL DEFINING SAID BORE EXPANDS AS THE STUD IS THREADED INTO SAID BORE AND SAID INNER ENDS OF EACH INSERT CUTS A THREAD ON THE STUD, THE SAID INNER ENDS OF SAID INSERTS BEING GENERALLY RECTANGULAR IN TRANSVERSE CROSS SECTION AND BEING POSITIONED WITH THEIR LATERAL AXES INCLINED RELATIVE TO THE TRANSVERSE PLANE OF THE BODY OF SAID NUT, THE LATERAL AXES OF SAID INSERTS BEING DISPOSED ALONG A COMMON HELIX ALONG THE INTERNAL CYLINDRICAL WALL DEFINING THE BORE OF THE NUT.