Patent ID: 7677870
Filing Date: 2010-03-16
Classification: F01D

Abstract:
1. An airfoil for use in a turbo machine, the airfoil comprising: an airfoil portion having a leading edge and a trailing edge, and a pressure side and a suction side extending from the leading edge to the trailing edge; a root portion extending from the airfoil portion, the root portion functioning to secure the airfoil to the turbo machine; screw threads on the outer surface of the root portion to allow for the airfoil to be screwed into the turbo machine; the airfoil being threaded into a hole such that each airfoil can be removed from the turbo machine individually; the screw threads having a dove tail shape cross section; a locking pin to prevent rotation of the root portion with respect to the hole in which the root portion is screwed into; and, the locking pin is biased outward from the airfoil by a spring.