Alignment device for artificial limbs

An adjustable coupling for joining together parts of a limb prosthesis comprising:

• a first member having an end face, a convex surface protruding in a longitudinal direction from the middle of the end face, flange means extending transversely from the end of the first member, at least two apertures through the flange means at locations disposed symmetrically about the convex surface;
• means defining a concave or convex bearing surface on the face of the flange means that faces away from the convex surface on the end of the first member, each means overlying an aperture;
• a second member having an end face formed with a concave seat that conforms to but is shallower than the convex surface of the first member so that the first member is supported with its flange means at a clearance from the second member whereby the first member can tilt on the second member, at least two threaded bores being formed in the second member at locations disposed symmetrically about the concave surface and conforming to the locations of the apertures, said bores converging at a small angle with increasing depth;
• a member overlying each aperture having a hole therethrough, a generally planar top face and a convex or concave lower face tiltably received in the respective concave or convex bearing surface means;
• and
• at least two clamping screws passed through the holes in the tiltable members and the apertures in the flange means with their heads seating on the tiltable members and their theaded portions received in the bores of the second member, the first and second members being adjustable to a desired angular position when the screws are slack and being maintained at that angular position when the screws are tight.