Expansion bolt arrangement

Claim 1

IN AN EXPANSION BOLT ARRANGEMENT, COMPRISING, IN COMBINATION, AN ELONGATED PIN MEMBER OF RESILIENTLY DEFORMABLE MATERIAL FORMED WITH A SUBSTANTIALLY CENTRAL BORE THERETHROUGH HAVING AT ONE END OF SAID PIN MEMBER A GREATER DIAMETER THAN AT THE OTHER END THEREOF AND BETWEEN SAID ENDS A TAPERING PORTION, SAID PIN MEMBER BEING ALSO FORMED WITH A SLOT EXTENDING TRANSVERSELY THERETHROUGH AND IN LONGITUDINAL DIRECTION FROM SAID OTHER END OF SAID PIN MEMBER TOWARD BUT SHORT OF SAID ONE END; A FIRST PAIR OF SHORT AND RELATIVELY THICK RESILIENT TONGUES EACH INTEGRALLY CONNECTED AT ONE END THEREOF TO SAID PIN MEMBER IN THE REGION OF THE OTHER END OF THE LATTER; AND A SECOND PAIR OF TONGUES LONGER AND THINNER THAN THE TONGUES OF SAID FIRST PAIR OF TONGUES AND EACH TONGUE OF SAID SECOND PAIR OF TONGUES BEING INTEGRALLY CONNECTED AT ONE END THEREOF TO AN INTERMEDIATE PORTION OF SAID PIN MEMBER LOCATED BETWEEN THE ENDS THEREOF, THE TONGUES IN EACH PAIR BEING ARRANGED OPPOSITE EACH OTHER AND PROJECTING FROM THE CONNECTED END THEREOF TOWARD SAID ONE END OF SAID PIN MEMBER OUTWARDLY INCLINED TO THE AXIS OF THE LATTER, SAID PIN BEING FORMED IN THE REGION OF EACH TONGUE WITH A CUTOUT OF A LENGTH SUBSTANTIALLY EQUAL TO THAT OF THE RESPECTIVE TONGUE AND A DEPTH SUBSTANTIALLY EQUAL TO THE THICKNESS OF THE RESPECTIVE TONGUE SO THAT DURING INSERTION OF SAID PIN IN A BORE, THE PROJECTING PORTIONS OF SAID TONGUES MAY BE RESILIENTLY BENT INTO THE RESPECTIVE CUTOUTS, THE CONNECTED END OF EACH TONGUE BEING LOCATED IN THE RESPECTIVE CUTOUT.