Digger tooth

Claim 1

IN AN ENDLESS DIGGING UNIT FOR A MOBILE EXCAVATING MACHING INCLUDING A PLURALITY OF EXCAVATING BUCKETS SECURED TO THE OUTER BOUNDARY OF SAID UNIT AND HAVING DIGGER TEETH SECURED TO THE LEADING EDGES OF SAID BUCKETS AND PROJECTING FORWARDLY THEREFROM, THE DIGGER TEETH ON SAID BUCKETS BEING ARRANGED SO THAT THE DIGGER TEETH ON ONE BUCKET ARE SPACED LATERALLY OF THE DIGGER TEETH ON THE NEXT FOLLOWING BUCKET SO THAT SUBSTANTIALLY THE ENTIRE TRANSVERSE WIDTH OF A TRENCH TO BE EXCAVATED MAY BE ENGAGED BY THE DIGGER TEETH ON A PREDETERMINED SERIES OF SAID BUCKETS, EACH OF SAID DIGGER TEETH COMPRISING A BASE MEMBER SECURED TO THE RESPECTIVE BUCKET AND HAVING A PROJECTING PORTION THEREON, A DETACHABLE CUTTING TIP MEMBER HAVING A FLATTENED BLADE-LIKE TIP AND HAVING A PROJECTING PORTION, ONE OF SAID PROJECTING PORTIONS DEFINING A SOCKET AND THE OTHER OF SAID PROJECTING PORTIONS DEFINING A SHANK RECEIVED IN ENGAGED RELATION IN SAID SOCKET, THE INTERIOR OF SAID SOCKET BEING COMPRISED OF A PLURALITY OF SURFACE SECTIONS DISPOSED IN ABUTTING RELATION AT THEIR LENGTHWISE EDGES AND PROVIDING A GENERALLY POLYGONAL SHAPED CONFIGURATION IN VERTICAL SECTION FOR SAID SOCKET, SAID SHANK BEING OF GENERALLY POLYGONAL SHAPED CONFIGURATION IN VERTICAL SECTION BUT HAVING A LESSER NUMBER OF SURFACE SECTIONS AS COMPARED TO THE NUMBER OF SURFACE SECTIONS OF SAID SOCKET, SAID TIP MEMBER BEING ADAPTED TO BE SELECTIVELY ORIENTED INTO A PLURALITY OF ROTATIVELY ANGLED POSITIONS ABOUT THE LENGTHWISE AXIS OF SAID TIP MEMBER, SAID PLURALITY OF POSITIONS BEING OF GREATER NUMBER THAN SAID SURFACE SECTIONS OF SAID TIP MEMBER, AND MEANS INTERLOCKINGLY SECURING SAID TIP MEMBER TO SAID BASE MEMBER.