Hollow tubular spirally wound covered metallic anchor

Claim 1

IN AN EXPANSIBLE ANCHOR, THE COMBINATION OF A SUBSTANTIALLY TUBULAR CORE COMPRISING A SET OF SPIRALLY WOUND WIRES, A TUBULAR JACKET OF RESILIENT MATERIAL ENCLOSING SAID CORE, A PAIR OF FRUSTO-CONICAL EXPANDING MEMBERS POSITIONED IN THE RESPECTIVE END PORTIONS OF THE CORE AND PROVIDED WITH AXIAL BORES, THE BORE OF ONE OF SAID EXPANDING MEMBERS BEING SCREW-THREADED, AN EXPANDING SCREW ROTATABLY EXTENDING THROUGH THE BORE OF THE OTHER EXPANDING MEMBER AND THROUGH THE INTERMEDIATE PORTION OF THE CORE AND THREADEDLY ENGAGING THE MEMBER WITH THE THREADED BORE, WHEREBY WHEN SAID SCREW IS TIGHTENED SAID EXPANDING MEMBERS MAY BE DRAWN TOGETHER TO RADIALLY EXPAND THE END PORTIONS OF SAID CORE AND THE END PORTIONS OF SAID JACKET ENCLOSING THE SAME, AN END PLATE DISPOSED AT ONE END OF SAID CORE AND PROJECTING RADIALLY OUTWARDLY BEYOND THE OUTER SURFACE OF SAID SLEEVE, ONE OF THE WIRES OF SAID CORE BEING SECURED TO SAID END PLATE, THE OTHER WIRES OF THE CORE BEING DETACHED FROM THE END PLATE, AND ANCHOR MEANS ON THE END PLATE FOR PREVENTING ROTATION THEREOF WHEN SAID SCREW IS TIGHTENED.