Wall patching device with collapsible membraneous body

Claim 1

A PLUG FOR BLOCKING AN OPENING IN A WALL PRIOR TO THE APPLICATION OF PLASTER THERETO FOR REPAIR PURPOSES WHICH COMPRISES AN ELONGATED FRAME INCLUDING A FLAT BASE AND TWO RODS ANCHORED IN SAID BASE IN SPACED PARALLEL RELATION TO A PRINCIPAL AXIS OF SAID PLUG, SAID RODS BEING CONNECTED AT THE END OPPOSITE SAID BASE BY A RING, A SCREW SHAFT IN SAID RING AND IN SAID BASE AT ONE END THEREOF FOR FREE ROTATION RELATIVE TO SAID BASE AND RING, A SCREW PROJECTING AXIALLY BEYOND THE RING TO PROVIDE ACCESS FROM THE END OF THE FRAME OPPOSITE THE BASE TO TURN SAID SCREW SHAFT, A FLAT ANNULAR MEMBER IN THREADED ENGAGEMENT WITH SAID SCREW SHAFT AND IN SLIDABLE AXIAL ENGAGEMENT WITH SAID RODS, A PLURALITY OF SPACED RIBS PIVOTALLY ENGAGED AT ONE OF THEIR ENDS TO SAID ANNULAR MEMBER ADJACENT TO THE FACE OF SAID MEMBER OPPOSITE SAID BASE, SAID PIVOTAL CONNECTION BEING SUCH THAT SAID RIBS MAY COLLAPSE IN AN AXIAL DIRECTION AWAY FROM SAID BASE AND MAY EXPAND RADIALLY TO BE PERPENDICULAR TO SAID AXIS UNTIL STOPPED BY CONTACTING THE ADJACENT FACE OF SAID ANNULAR MEMBER, AND FLEXIBLE WEBS JOINING EACH NEXT ADJACENT RIG THROUGHOUT ITS LENGTH TO FORM IN EFFECT A FLAT SURFACE FOR BACKING UP THE APPLICATION OF PLASTER AND THE LIKE WHEN SAID RIB AND WEBS HAVE BEEN DRAWN TOWARD AND AGAINST THE REAR SURFACE OF SAID WALL OPENING BY ROTATION OF SAID SCREW SHAFT.