Patent ID: 6067868
Filing Date: 2000-05-30
Classification: F16H,Y10T

Abstract:
An anti-rotation mechanism in a screw linear actuator, comprising:an outer hollow cylinder having an axial length and portions of a circular cross section at both ends of said axial length, and having an intermediate portion comprising an inner surface with a cross-sectional shape which is uniform along said axial length and an outer surface,said inner surface of the hollow cylinder having at least two axial edges with a flat rotation-inhibiting surface therebetween parallel to the longitudinal axis of said hollow cylinder, formed as at least a part of said inner surface, and at least one arcuate surface meeting said at least two axial edges;said outer surface of the hollow cylinder having circular end portions, and at least two axial edges with a flat outer surface therebetween parallel to the longitudinal axis of said hollow cylinder, formed as at least a part of said outer surface, and at least one arcuate surface meeting said at least two axial edges;an inner cylinder having an inner cylinder outer peripheral surface, and an inner cylinder collar provided on said inner cylinder outer peripheral surface which is slidably mounted within said outer cylinder for axial advancement and retraction with respect to said outer cylinder, said inner cylinder collar comprising an outer collar surface having at least two axial edges with a flat surface therebetween in a position to be abutted with said flat rotation inhibiting surface of said inner surface, and at least one arcuate surface meeting the axial edges of said collar outer surface, said collar thereby being prevented from rotation, the flat surface of the outer surface of said inner cylinder collar being guided and supported slidably by the flat surface of the inner surface of said intermediate portion of the outer cylinder; anda casing with a hole having a interior bore telescopically receiving the circular end portions of the outer cylinder, and a set screw penetrating said bore to engage said flat outer surface of the outer hollow cylinder.