Abstract: A folding tool bar apparatus for a farm implement or the like having a horizontally disposed main frame and a pair of wing sections pivotally attached at each end thereof to the main frame. Gauge wheels are attached to each of the wing sections for spacing a wing section a predetermined distance from the ground when the wing section is in use. A rigid link member is pivotally attached to each of the wing sections. Hydraulic cylinders are pivotally attached to the main frame and to the link members. These hydraulic cylinders have a first elongated position which permit the wing members to be in a substantially horizontally extended working position and a second shortened position for causing the wing members to be in a substantially folded transport position.

Abstract: A gauge wheel apparatus for attachment to the ends of agricultural folding tool bars for a banding sprayer, or the like, which permits the level of the tool bar to be adjusted to maintain the ends of a tool bar in a desired position above the ground, while at the same time absorbing the shock of uneven ground encountered by such gauge wheel so that the tool bar remains in substantially the same place above the ground despite such irregularities in the surface of the ground.