Patent ID: 7134838

Claim:
A rotor blade for a rotary machine having a flowpath for working medium gases, the rotor blade having an inner end which includes a base which adapts the rotor blade to be joined to a rotatable structure, an outer end having a laterally extending, outwardly facing surface which is disposed circumferentially about an axis Ar and having a radius of curvature about the axis Ar, an airfoil having a leading edge, a trailing edge, and a suction side and a pressure side which each extend chordwise from the leading edge to the trailing edge, and a tip region which includes the outer end, which comprises: a plurality of airfoil sections disposed spanwise about and perpendicular to a stacking line for defining the surfaces of the airfoil, the stacking line of the airfoil extending spanwise, and each airfoil section having a leading edge, a trailing edge spaced chordwise from the section leading edge, a suction side extending from the section leading edge to the section trailing edge, and a pressure side extending from the section leading edge to the section trailing edge; a chord line having a length C, a mean chord line extending from the section leading edge to the section trailing edge about midway between the section suction side and the section pressure side, a leading edge region extending about three percent of the length of the chord line along a line tangent to the mean chord line at the section leading edge, a trailing edge region extending about three percent of the length of the chord line along a line tangent to the mean chord line at the section trailing edge; a tip shroud for the rotor blade disposed in the tip region, the tip shroud including a depression in the shroud generally radially outwardly of the airfoil and generally following the curve in the tip region of the pressure and suction sides of the airfoil from the leading edge region to the trailing edge region, wings extending from the sides of the airfoil, the wings including a pressure side wing extending from the pressure side of the airfoil having a front portion and a rear portion which continue the surface of the depression, and having a laterally facing pressure side a suction side wing that extends from the suction side of the airfoil having a front portion and a rear portion which continue the surface of the depression, and having a laterally facing suction side, and, a seal land extending radially outwardly, the seal land extending past the sides of the airfoil between the front and rear portions of the wings and having said outwardly facing surface which extends circumferentially with respect the axis Ar and which adapts the seal land to block the leakage of working medium gases past the tip region of the rotor blade.