Agricultural implement with wing lift

Claim 1

In a farm implement comprising a central body and a lateral wing hinged thereto for movement through substantially 180° about a first horizontal axis between a first position, in which said wing lies inverted upon said central body, and a second position, in which said wing lies as an extension of said body, the improvement which comprises: a. a link having a first end pivotally connected to said wing for rotation about a second axis parallel to and displaced from said first axis, b. stop means carried by said wing for lateral engagement by said link at a location between its ends at a point in the pivotal movement of said link, c. roller means carried at the second end of said link for rotation about a third axis parallel to said first axis, d. a hydraulic cylinder, pivoted at one end to said body about a fourth axis parallel to said first axis and having an actuator pivoted at the other end to said second end of said link for rotation about said third axis, whereby to apply force, to said second end of said link along a line passing perpendicularly through said third axis, to first bring said link into engagement with said stop means and then cause rotation of said wing about said first axis, e. and horizontal plane track means carried by the central body, said track means spaced lower than said first axis and incurring only downward engagement by said roller means after said link engages said stop means, so that continued application of said force thereafter continues the rotation of said wing and causes rolling movement of said roller means along said track means, and simultaneously causes displacement between said stop means and said link, f. said first, second, third and fourth axes being so positioned with respect to each each other and with respect to said plane track means that whenever said wing moves from said second position to said first position, said roller means first makes contact with said plane track means adjacent one each thereof and is then displaced to the opposite end of said plane track means and that during such displacement, said second axis moves steadily away from the line of action of said actuator up to and including the time said wing reaches said first position, said second axis being on the opposite side of said line from said plane track means whenever said roller means engages said plane track means, whereby force acting in a vertical plane through the line of action of said actuator has no component away from the plane of said track.