Foldup implement with lift arrangement for wing thereof

Claim 1

A farm implement including a main section adapted for connection in draft relation to a tractor and a wing section pivotally connected to the main section at one lateral side of the latter for vertical swinging movement about a longitudinal axis between a lowered working position and a raised transport position, means for pivoting said wing section relative to said main section between said working and transport positions comprising: a double-acting hydraulic jack disposed in transverse relation to said longitudinal axis having cylinder and rod components, pivot means pivotally connecting one of said components to one of said sections at a point spaced from said longitudinal pivot axis, and a lost motion pivot connection between the other of said components and the other of said sections including a first pivot part fixedly secured to said other section at a position spaced laterally from said longitudinal pivot axis including an elongated slot with the elongated extent thereof extending generally laterally relative to said other section, said pivot part and said pivot means being disposed on laterally opposite sides of said longitudinal pivot axis when said wing section is in its lowered working position, and a second pivot part on said other component in cooperative engagement with said slot for movement from one extremity of said slot to the other, the longitudinal axis of said jack having a substantially right-angle relationship with said elongated extent of said slot when said wing section is raised by contraction of said jack to a position wherein the center of gravity of said wing section is in vertical alignment with said longitudinal axis, said pivot connection between said sections and said lost motion pivot connection permitting said wing section to swing downwardly about said longitudinal axis to a downwardly inclined angle relative to said main section.