Patent ID: 6860189
Filing Date: 2005-03-01
Classification: F15B

Abstract:
1. An actuator constructed of: (a) a first flexible hollow cylindrical fluid impermeable tube ( 6 ) which can be expanded at one free end along a central axis of the cylinder when a fluid is introduced into the tube; and contracted along the same axis when fluid is withdrawn from the tube; and (b) a second flexible hollow cylindrical fluid impermeable tube ( 16 ) which can be expanded at one free end along a central axis of the cylinder when a fluid is introduced into the tube; and contracted along the same axis when fluid is withdrawn from the tube; characterized by: (c) a first movable cable and pully mechanism with the cable affixed to the pully associated with the first and second tubes ( (d) a second movable cable and pulley mechanism with the cable affixed to the pulley connected by a shaft ( (e) a rigid frame (