Patent ID: 6231027
Filing Date: 2001-05-15
Classification: F16K,Y10T

Abstract:
A high torque rotating actuator, comprising:a housing;a stem coaxially positioned within said housing;a drive bushing engaging said stem;an intermediate head axially adjacent said drive bushing, said intermediate head including a plurality of longitudinal grooves and said stem extends through said intermediate head;an annular piston positioned between said drive bushing and said housing, said annular piston reciprocable within said housing by an urging means;said drive bushing including a plurality of helical grooves, said helical grooves having a variable helix angle; and,said annular piston having first and second engaging means, said first engaging means engaging said helical grooves of said drive bushing and said second engaging means engaging said longitudinal grooves in said intermediate head whereby reciprocation of said annular piston in said housing causes rotation of said drive bushing and said stem.