Automatic disk harrow hinge locking device

Claim 1

In a folding wing implement including a main beam and wing beam, an upstanding bracket affixed to said main beam, and upwardly extending lug affixed to said wing beam, hinge means comprising a pivot pin interconnecting the upper ends of said bracket and said lug to accommodate pivoting of the wing beam from an extended operating position in horizontal alignment with the main beam to a folded inoperative position relative thereto, abutting means on said main and wing beams, said respective abutting means engaging when the wing beam is in the extended operative position to prevent further downward pivotal movement of the wing beam relative to the main beam, releasable means for locking the wing beam in its extended operating position comprising, a rockable member pivotally connected to said wing beam having a lower horizontal portion in underlapping engagement with said main beam when said wing beam is in the operating position, and an upright lever portion for rocking said rockable member out of underlapping engagement with said main beam, and yieldable means comprising a spring operatively connected between said upwardly extending lug and said upright lever portion for biasing said rockable member into underlapping engagement with said main frame, said upstanding bracket comprises a pair of brackets affixed to opposite sides of said main frame, and said upwardly extending lug comprises a pair of lugs affixed to opposite sides of said wing beam and wherein said rockable member is a U-shaped member having its bite portion underlapping said main beam in said operating position of the wing beam and including upperly extending arms and pivot means connecting said upperly extending arms to said pair of lugs.