Patent ID: 6548926
Filing Date: 2003-04-15
Classification: H02N,Y10T

Abstract:
A linear displacement actuator comprising:a male part having an outside diameter; a female part in which said male part is engaged having an inside diameter, said inside diameter of said female part being greater than said outside diameter of said male part; a screw thread on one of said parts; at least one peripheral rib on the other of said parts which collaborates with said screw thread; and at least a pair of linear actuators arranged perpendicularly in a support that is free to be displaced axially with respect to said male part and which places said female part in sinusoidal vibration in a pair of perpendicular directions with an appropriate phase shift between said vibrations, and displaces, rotation-wise, a line of contact between said screw thread and said at least one peripheral rib while said screw thread and said peripheral rib remain motionless in terms of rotation one with respect to each other to bring about relative linear displacement of said female part and said male part.