Foldable agricultural implement

摘要

An agricultural implement comprising a tool bar having ground working tools supported thereon. The tool bar comprises a main frame with a pair of wing frames pivotally connected to the ends thereof. The wing frames are pivotally connected to the main frame so that the wing frame may be pivotally moved from a working position to a transport position over a portion of the main frame. The pivotal connection between each of the wing frames and the main frame comprises a first support secured to one end of the main frame and extending upwardly therefrom. A second support is secured to the inner end of the wing frame and also extends upwardly therefrom. The upper end portions of the first and second supports are pivotally connected about a horizontal axis which is transversely disposed to the length of the tool bar. A first linkage is pivotally connected at one end to the first support inwardly of and below the upper end thereof while a second linkage is pivotally connected at one end thereof to the second support outwardly of and below the upper end thereof. A third linkage is pivotally connected to and extends between the other ends of the first and second linkages. A power cylinder is positioned above the tool bar and has a cylinder body mounted on the third linkage. The cylinder rod of the power cylinder is pivotally connected to the pivotal connection between the upper ends of the first and second supports whereby extension of the cylinder rod from the cylinder body will pivotally move the wing frame from its operative position to its transport position and whereby retraction of the cylinder rod into the cylinder body will pivotally move the wing frame from its transport position to its operative position.