Push-type blind fastener, removable, reusable, provided with self-locking, self-retaining, self-securing means

Claim 1

A REUSABLE SELF-LOCKING SELF-RETAINING SELF-SECURING BLIND FASTENER ADAPTED FOR PASSAGE INTO ALIGNED APERTURES IN THE FRONT AND REAR PANELS OF THE WORKPIECE WHICH IS CAPABLE OF BEING INSTALLED ENTIRELY BY HAND-PUSHED OPERATION WITH BOTH RESPECTIVE OPPOSITE ENDS THEREOF FLUSH AND WHICH IS CAPABLE OF BEING UNFASTENED BY HAND-PUSHED OPERATION COMPRISING, IN COMBINATION, A SLEEVE INTO WHICH IS SLIBABLY ENGAGED A PUSH BOLT WITH A SINGLE ANNULAR LOCKING AND RELEASING GROOVE, SAID SLEEVE HAVING A COUNTERSINK HEAD AT ONE END THEREOF FROM WHICH EXTENDS A CYLINDRICAL HOLLOW BODY PORTION WITH A CENTRAL BORE THROUHOUT ITS LENTHT, THE DIAMETER OF SAID BORE IN SAID COUNTERSINK HEAD BEING GREATER THAN THE DIAMETER OF SAID BORE IN SAID BODY POR TION, DIRECTLY UNDER SAID COUNTERSINK HEAD BEING PROVIDED EXTERNAL SELF-RETAINING MEANS CAPABLE OF BEING IMBEDDED BY HAND INTO SAID FRONT PANEL, BELOW SAID SELFRETAINING MEANS BEING PROVIDED RESILIENT LOCKING AND SECURING TABS SLIGHLY BENT INWARDLY TOWARDS THE AXIS OF SAID SLEEVE AND EXTENDING INTO SAID CENTRAL BORE, SAID TABS BEING LOCATED ON SAID BODY PORTION TO CORRESPOND AND COOPERATE WITH SAID GROOVE ON SAID BOLT TO PROVIDE SELF-LOCKING THEREIN, THE END OPPOSITE SSAID COUNTERSINK HEAD HAVING RESILIENT PRONG MEANS EXTENDING INWARDLY TOWARDS THE AXIS OF SAID SLEEVE AND HAVING RADIALLY EXTENDING PROJECTIONS AT THE TERMINAL TIPS THEREOF, SAID TIPS EXTENDING RADIALLY OUTWARDLY NO FURTHER THAN THE OUTER SURFACE OF SAID BODY PORTION WHEN IN THE INWARDLY EXTENDING (UNFASTENED) POSITION, SAID TIPS EXTENDING BEYOND SIAD OUTER SURFACE WHEN IN THE FLARED RADIALLY OUTWARDLY (FASTENED) POSITION, AND THE DISTANCE BETWEEN SAID TIPS TO THE TOP SURFACE OF SAID COUNTERSINK HEAD BEING EQUAL TO THE OVERALL LENGTH OF SAID BOLT, SAID BOLT HAVING AN ENLARGED HEAD AT ONE END THEREOF OF A LESSER DIAMETER THAN SAID BORE IN SAID COUNTERSINK HEAD BUT OF GREATER DIAMETER THAN SAID BORE IN SAID BODY PORTION, SAID BOLT HAVING A CYLINDRICAL SHANK PORTION EXTENDING FROM SAID ENLARGED HEAD OF SLIGHTLY LESSER DIAMETER THAN SAID BORE IN SAID BODY PORTION TO ALLOW FREE SLIDEABLE ENGAGEMENT THEREIN, SAID BOLT SHANK BEING PROVIDED WITH SAID GROOVE AT A DISTANCE FROM SAID ENLARGED HEAD SUBSTANTIALLY EQUAL TO THE DISTANCE BETWEEN THE EXMITIES OF SAID TABS AND THE TOP SURFACE OF SAID COUNTERSINK HEAD TO RECEIVE SAID TABS FOR SELF-LOCKING THEREIN WHEN THE TOP SURFACE OF SAID BOLT HEAD IS SUBSTANTIALLY COPLANAR WITH THE TOP SURFACE OF SAID COUNTERSINK HEAD, SAID GROOVE BEING ADAPTED UPON FURTHER INSERTION BY A FINGER OF THE HAND INTO SAID BORE IN SAID BODY PORTION TO RELEASE SAID PRONG MEANS AND UNFASTEN SAID PANELS, SAID FASTENER BEING RESET FOR REUSE BY PUSHING SAID BOLT INTO SAID SLEEVE IN THE OPPOSITE DIRECTION PAST SAID PRONG MEANS ALLOWING SAID PRONG MEANS TO RETURN TO SAID (UNFASTENED) POSITION, SAID LOCKING BOLT SECURING TABS EXERTING CLAMPING ACTION UPON SAID BOLT SECURING SAID BOLT THEREIN AND PREVENTING DISENGAGEMENT THEREOF.