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A rotor for an axial flow turbomachine includes a disc, a rim on the disc having blade retention slots, and blades having roots in the slots and airfoils extending radially out from the rim. The airfoils project through correspondingly shaped slots in a cylindrical platform concentric with the rim o

A rotor for an axial flow turbomachine includes a disc, a rim on the disc having blade retention slots, and blades having roots in the slots and airfoils extending radially out from the rim. The airfoils project through correspondingly shaped slots in a cylindrical platform concentric with the rim of the rotor. A first annular flange at one end of the platform has a lip at its inside diameter which hooks under the inside diameter of a first annular flange on the rim for radial retention of the platform. A second annular flange at the other edge of the platform has a lip at its inside diameter which hooks under a lip at the outside diameter of an annular cover. The cover has another lip at its inside diameter which hooks under a second annular flange on the rim for radial retention of the cover and the platform.

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In a turbomachine rotor including a disc, means defining an annular rim on said disc having a cylindrical outside wall between a pair of annular side walls, means defining a plurality of blade retaining slots in said rim opening through said outside wall and through each of said side walls, and a pl

In a turbomachine rotor including a disc, means defining an annular rim on said disc having a cylindrical outside wall between a pair of annular side walls, means defining a plurality of blade retaining slots in said rim opening through said outside wall and through each of said side walls, and a plurality of blades each having a root captured radially in one of said retaining slots between said side walls and an airfoil extending radially out from said cylindrical outside wall, the combination comprising: a ring disposed around said rim including a cylindrical platform concentric with said cylindrical outside wall, means defining a plurality of airfoil-shaped slots in said platform each receiving a corresponding one of said blade airfoils, means defining a first annular flange extending radially in from a first edge of said platform, means defining a second annular flange extending radially in from a second edge of said platform, means defining on said first annular flange a first lip having a radially outwardly exposed surface at the inside diameter of said first annular flange, means defining on said second annular flange a second lip having a radially outwardly exposed surface at the inside diameter of said second annular flange, means on said rim defining a first radially inwardly facing cylindrical surface engaging said first lip on said radially outwardly exposed surface thereof for reacting rotation-induced loads from said ring to said rim, and means on said rim defining a second radially inwardly facing cylindrical surface engaging said second lip on said radially outwardly exposed surface thereof for reacting rotation-induced loads from said ring to said rim.