Self-locking heat-insulating female screw

Claim 1

IN COMBINATION; A STEEL SHEATHING; HEAT-INSULATION PANELS; AND HEAT-INSULATION SELF-LOCKING FASTENING MEANS FOR SECURING SAID HEAT-INSULATION PANELS TO SAID SHEATHING SAID FASTENING MEANS COMPRISING: A PLURALITY OF STATIONARY STEEL STUDS THREADED-EXTERNALLY AT THEIR OUTER ENDS AND HAVING THEIR INNER ENDS SECURED TO SAID STEEL SHEATHING AT SPACED LOCATIONS, SAID STUDS EXTENDING INTO HOLES PROVIDED THEREFOR IN SAID HEAT-INSULATION PANELS, AND SOLID ENLARGED HEADED HOLLOW-SHANK INTERNALLY-THREADED FEMALE SCREWS OF RESILIENT DEFORMABLE PLASTIC MATERIAL OF GOOD HEAT-INSULATION PROPERTIES THREADED ON TO SAID STEEL STUDS FOR SECURING SAID INSULATION PANELS, THE INTERNAL DIAMETER OF THE HOLLOW SHANK OF SAID SCREWS AND THE PITCH AND TYPE OF THE INTERNAL THREADS OF SAID SCREWS CONFORMING TO THE THREADED ENDS OF SAID STEEL STUDS, AT LEAST SAID SHANK PORTION OF SAID FASTENER SCREWS AND THE INTERNAL THREADS THEREOF DEFORMING SUFFICIENTLY BY AXIAL EXTENSION DURING ROTATIONAL TIGHTENING ON THE STATIONARY THREADED STUD TO RESIST LOOSENING UNDER VIBRATION.