Anchoring socket

Claim 1

ANCHORING SOCKET FOR SECURELY ANCHORING A SCREW SUBJECTED TO TENSION FORCES IN A MEMBER OF SOFT MATERIAL SUCH AS FIBER BOARD OR THE LIKE AND COMPRISING A TUBULAR PORTION ADAPTED TO EXTEND THROUGH A BORE IN THE MEMBER; A HEAD PORTION INTEGRAL WITH ONE END OF SAID TUBULAR PORTION CLOSING SAID ONE END AND EXTENDING WITH AN ANNULAR RIM THEREOF BEYOND THE OUTER PERIPHERY OF SAID TUBULAR PORTION, SAID RIM HAVING AN OUTER CIRCUMFERENCE SUBSTANTIALLY LARGER THAN THE CIRCUMFERENCE OF SAID TUBULAR PORTION SO AS TO BE ADAPTED TO ABUT AGAINST RELATIVELY LARGE FACE PORTIONS OF THE MEMBER AROUND THE BORE WHEN SAID TUBULAR MEMBER EXTENDS THROUGH THE BORE; AND MEANS IN THE INTERIOR OF SAID TUBULAR PORTION FOR ENGAGEMENT WITH THE THREADS OF A SCREW ADAPTED TO BE SCREWED FROM THE OTHER END INTO SAID TUBULAR PORTION, SAID MEANS INCLUDING A PLURALITY OF RIBS INTEGRAL WITH SAID TUBULAR PORTION AND EXTENDING ANGULARLY DISPLACED FROM EACH OTHER FROM THE INNER SURFACE OF SAID TUBULAR PORTION INWARDLY IN SUBSTANTIAL RADIAL DIRECTION AND IN LONGITUDINAL DIRECTION FROM ONE TO THE OTHER END OF SAID TUBULAR PORTION, SAID RIBS HAVING AT SAID INNER SURFACE OF SAID TUBULAR PORTION A GREATER THICKNESS THAN AT INNER FREE END FACES THEREOF AND SAID RIBS TAPERING IN WIDTH FROM SAID ONE TO THE OTHER END OF SAID TUBULAR PORTION SO THAT UPON ENGAGEMENT OF THE MEANS INTERIOR OF SAID TUBULAR PORTION WITH A SCREW SAID HEAD PORTION IS URGED INTO ABUTMENT WITH THE FACE PORTIONS OF THE MEMBER.