Patent ID: 7762780

Claim:
A blade assembly in a turbo-machine, the assembly comprising: a blade comprising a platform with a surface; a groove formed in said surface, the groove configured to linearly extend along a groove axis in a direction generally along an axis of rotation of the turbo-machine, the groove positioned to extend between adjacent blade assemblies of a common row of blades of the turbo-machine, the groove adapted to receive a cylindrical seal pin having a circular cross-section along the groove axis, the seal pin further having at least one end proximate a corresponding end of the groove, the seal pin operable to make sealing contact with a corresponding surface of an adjacent blade assembly to avoid leakage of a fluid through a gap there between, wherein the end of the groove comprises a first portion comprising a blocking surface generally normal to the axis of rotation, the blocking surface adjacent to the end of the seal pin, and the end of the groove further comprises a second portion comprising a lengthwise extension of the groove beyond the blocking surface; and a dam disposed between the groove end and the lengthwise extension of the groove, the dam configured to radially extend from a bottom location at the end of the groove, the dam positioned substantially normal relative to the groove axis into a portion of the lengthwise extension of the groove, the dam constructed as an integral structure of the blade platform.