US Patent 7648368 Aircraft propeller assembly

An electrical-power-transfer assembly (50) transferring electrical power from an onboard power source to electrical deicers (22) on propeller blades (18). The assembly (50) comprises a first race structure (52) mounted to the aircraft, a second race structure (54) mounted to the propeller assembly (12), and rolling elements (76/78) caged in raceway(s) (72/74) situated between the race structures (52/54). The current path established by the assembly (50) passes through the raceway(s) (72/74) and the rolling elements (76/78) caged therein.