Patent ID: 6506023
Filing Date: 2003-01-14
Classification: F04D,Y10S

Abstract:
An integrally formed stamped sheet-metal blade having 3D structure, comprising:an inner blade member formed as a hollow dish and having a plurality of 3D inner blades extending radially outward, each inner blade including from inward to outward an inner blade root and an inner blade body which bends at an angle with respect to the inner blade root, the inner blade roots forming a center hub opening which has an engaging edge, the inner blade bodies having inner blade leading edges and inner blade trailing edges; and an outer blade member formed as a hollow dish and having a plurality of 3D outer blades extending radially outward, each outer blade including from inward to outward an outer blade root and an outer blade body, the outer blade roots forming a center mating opening having a mating edge, the outer blade bodies having outer blade leading edges and outer blade trailing edges; wherein the mating edge engages the engaging edge when the center hub opening mates with the center mating opening to mate and engage the outer blade member with the inner blade member and forming an integral sheet-metal blade assembly, the inner blade trailing edges mating and engaging with the outer blade leading edges.