Turbine and like rotor blades

Claim 1

IN A ROTOR HAVING A PERIPHERAL GROOVE EXTENDING CIRCUMFERENTIALLY ABOUT THE ROTOR AND BEING DEFINED BY A PAIR OF AXIALLY SPACED OPPOSED SERRATED FACES SO THAT A SERRATED BLADE PORTION MAY BE RADIALLY INSERTED AND PARTIALLY ROTATED IN THE GROOVE TO ENGAGE ITS SERRATIONS IN THOSE OF THE SERRATED FACES OF THE GROOVE AND A ROW OF BLADES FITTED THEREIN, THE BLADES OF THE SAID ROW HAVING SERRATED PORTIONS INTERLOCKING WITH THE SAID SERRATED FACES AND BEING DIMENSIONED TO PERMIT PLACEMENT IN THE GROOVE BY SUCH RADIAL INSERTION AND PARTIAL ROTATION AND HAVING A GAP TOO SMALL FOR SUCH BLADE INSERTION BETWEEN BLADES IN SAID ROW, AFTER THE BLADES HAVE BEEN SO INSERTED TO THE NUMBER POSSIBLE, MEANS EFFECTING CLOSURE OF THE SAID GAP COMPRISING A COMPOSITE SELF-LOCKING PACKER MEMBER COMPOSED OF TWO OUTER PIECES SERRATED ON THEIR OUTER FACES AND MATING WITH SAID OPPOSED SERRATED GROOVE FACES AND AN INNER WEDGE PIECE HAVING A RADIAL DIMENSION OF LESSER THICKNESS THAN THE RADIAL DEPTH OF THE ROTOR GROOVE, THE SAID INNER WEDGE PIECE BEING DISPOSED WITH ITS THINNER END OUTERMOST AND A SPRING IN SAID GROOVE DIRECTLY ABUTTING THE THICKER END OF SAID WEDGE PIECE, THE SAID TWO OUTER PIECES HAVING CORRESPONDINGLY SLANTED INNER FACES ENGAGING THE SAID WEDGE PIECE.