A BLADED ROTOR ARRANGEMENT WITH LOCK PLATES HAVING DEFORMABLE FEET

A bladed rotor arrangement (32) comprises a rotor (34), a plurality of rotor blades (36) and a plurality of lock plates (48, 50). The rotor blades (36) are mounted in circumferentially spaced axially extending slots (46) in the periphery of the rotor (34). A plurality of lock plates (48) are arranged at a first axial end of the rotor (34) and a plurality of lock plates (50) are arranged at a second axial end of the rotor (34). The radially outer ends (48A, 50A) of the lock plates (48, 50) engage corresponding grooves defined by radially inwardly extending flanges (54, 58) on the platforms (40) of the rotor blades (36). The radially inner ends (48B, 50B) of the lock plates (48, 50) also engage circumferentially extending grooves (60, 62). The radially inner end (48B, 50B) of each lock plate (48, 50) has three crushable, deformable, circumferentially spaced feet (64A, 64B, 64C, 66A, 66B, 66C) to reduce the risk of the lock plates (48, 50) chocking against the rotor (34), or seal plates (68, 70) and additional radial loads being reacted by the rotor blades (36) into the rotor (34).