Guard finger and ledger plate

Claim 1

IN A DEVICE OF THE CHARACTER DESCRIBED IN AN ELONGATED GUARD FINGER HAVING AN ELONGATED LEDGER PLATE SEAT HAVING A FRONT AND A REAR END, A LATERAL NOTCH IN SAID GUARD FINGER AT THE FRONT END OF SAID SEAT PROVING A LATERAL WALL PARALLEL TO SAID SEAT, A BORE IN SAID GUARD FINGER AT SAID FRONT END OF SAID SEAT, SAID GUARD FINGER HAVING UPSTANDING PORTIONS EDFINING A PAIR OF OPPOSED REARWARDLY CONVERGING UNDERBEVELED WALLS IN SAID GUARD FINGER AT THE REAR END OF SAID SEAT, A LUG MOUNTED BETWEEN SAID PAIR OF SAID CONVERGING WALLS AND HAVING A PAIR OF PARALLEL OPPOSED AXIAL WALLS ON SAID GUARD FINGER AT SAID REAR END OF SAID SEAT, BOTH OF SAID PARALLEL AXIAL WALLS EXTENDING NORMAL TO THE PLANE OF SAID SEAT, A RIGID LEDGER PLATE ON SAID HEAT, A PAIR OF COMPLEMENTAL REARWARDLY CONVERGING BEVELED SURFACES ON SAID LEDGER PLATE WITH ONE ENGAGING EACH OF SAID UNDERBEVELED WALLS PREVENTING MOVEMENT OF SAID LEDGER PLATE AWAY FROM SAID SEAT, A PAIR OF PARALLEL AXIAL SURFACES ON SAID LEDGER PLATE WITH ONE ENGAGING EACH OF SAID AXIAL WALLS ON SAID LUG PREVENTING LATERAL MOVEMENT OF SAID LEDGER PLATE AT SAID REAR END OF SAD SEAT, SAID LEDGER PLATE EXTENDING INTO SAID NOTCH ENGAGING SAID LATERAL WALL PREVENTING MOVEMENT OF SAID LEDGER PLATE AWAY FROM SAID FRONT END OF SAID SEAT, A PROJECTION OF SAID LEDGER PLATE EXTENDING INTO SAID BORE ENGAGING THE WALL THEREOF AND PREVENTING LATERAL MOVEMENT OF SAID LEDGER PLATE AT SAID FRONT END OF SAID SEAT, AND A SPRING IN SAID BORE ENGAGING SAID PROJECTION RESILIENTLY URGING COMPLEMENTAL BELVELED SURFACES INTO ENGAGEMENT WITH SAID CONVERGING UNDERBEVELED WALLS.