Self-closing gate

Claim 1

A SELF CLOSING GATE COMPRISING IN COMBINATION: A. A SUPPORT, B. A HINGE MEMBER PIVOTALLY AND VERTICALLY AXIALLY SLIDABLE ON SAID SUPPORT, C. A CAM RING FIXED ON SAID SUPPORT SURROUNDING SAID HINGE MEMBER HAVING, D. A DEPRESSED CENTERING PORTION UPWARDLY FACING CAM ROLLER RECEIVING SURFACE, E. UPWARDLY SLOPING CAM SURFACES EXTENDING ALONG EACH SIDE OF SAID DEPRESSED CENTERING SURFACE, F. A CAM ROLLER JOURNALED ON SAID HINGE MEMBER ADAPTED TO BE RECEIVED IN SAID DEPRESSED CENTERING PORTION AND ROLL ON SAID UPWARDLY SLOPING SURFACES SO AS TO RAISE SAID HINGE MEMBER AND GATE WHEN SAID GATE IS SWUNG TO EITHER SIDE OF SAID CLOSED POSITION AND TO CAUSE SAID GATE TO NORMALLY RETURN BY GRAVITY TO CLOSED POSITION WHEN RELEASED, G. AND FURTHER MEANS TO RETURN SAID GATE TO CLOSED POSITION COMPRISING A COMBINED TORSION AND COMPRESSION SPRING HAVING ONE END FIXED TO SAID SUPPORT AND ITS OTHER END FIXED TO SAID HINGE MEMBER IN NEUTRAL TORISONAL CONDITION WHEN SAID CAM ROLLER IS IN SAID DEPRESSED CENTERING PORTION FOR YIELDINGLY NORMALLY TORSIONALLY SWINGING SAID GATE TO CLOSED POSITION WHILE AXIALLY YIELDINGLY FORCING SAID CAM ROLLER AGAINST SAID CAM SURFACE ON SAID CAM RING AND IN SAID DEPRESSED CENTERING PORTION TO HOLD SAID GATE IN CLOSED POSITION.