Unitized fastener

Claim 1

IN A FASTENER, A SHANK HAVING FORWARD STRUCTURE INCLUDING EXTERIOR THREADING TO SCREW INTO WORK INTERIOR THREADING, SHEAR LUGS INTEGRAL WITH THE SHANKI AND PROJECTING OUTWARDLY FROM THE MAIN EXTENT THEREOF GENERALLY REARWARDLY OF SAID EXTERIOR THREADING AND FROM LOCATIONS WITHIN THE REARWARD EXTENSION OF A CYLINDRICAL LOCUS DEFINED BY THE OUTERMOST TIP DIAMETER OF SAID SHANK EXTERIOR THREADING, A WORK GRIPPING HOLDER IN THE FORM OF A RING EXTENDING ABOUT AND RETAINED ON THE SHANK REARWARDLY OF SAID SHANK EXTERIOR THREADING, THE HOLDER RING HAVING A HEAD WITH PERIPHERAL SERRATIONS AND A SKIRT DEPENDING FROM SAID HEAD INWARDLY OF A GENERALLY CYLINDRICAL LOCUS DEFINED BY THE TIPS OF THE HEAD SERRATIONS, THE SKIRT HAVING FORWARDLY EXTENDING RECESSES RECEIVING SAID LUGS, SAID HOLDING BEING SUBJECT TO BODILY ADVANCEMENT GENERALLY LENGTHWISE OF THE SHANK TO A FORWARD WORK GRIPPING POSITION IN WHICH THE HOLDER SKIRT INTERFITS SAID LUGS AND BLOCKS ROTATION THEREOF WITH THE SHANK RELATIVE TO THE HOLDER, SAID LUGS BEING SIZED FOR TWISTING OFF THE SHANK BY THE HOLDER SKIRT UPON UNSCREWING OF THE SHANK IN A DIRECTION TO BACK OUT OF THE WORK, THE DIMENSIONS OF SAID LUGS IN ANNULAR DIRECTIONS ABOUT THE SHANK BEING SUBSTANTIALLY LEGS THAN CORRESPONDING DIMENSIONS OF THE SKIRT BETWEEN SAID RECESSES, SAID SHANK FORWARD STRUCTURE BEING LOCATED TO RETRACT SAID HOLDER AND SHEARED PART FROM THE WORK IN RESPONSE TO CONTINUED UNSCREWING OF THE SHANK, AND A RETAINER LOOSELY RETAINING SAID HOLDER IN SAID REARWARD POSITION WHILE ACCOMMODATING SAID HOLDER ADVANCEMENT, SAID RETAINER COMPRISING AN INWARDLY YIELDABLE DEFLECTIBLE SPLIT ANNULUS MOUNTED ON THE SHANK AND RECEIVED IN A HOLDER INTERIOR RECESS OPENING TOWARD THE SHANK.