A tool bar assembly comprises a central section having a pair of pivotal wings each of which comprises pivotal inner and outer wing sections. The sections can be folded into a transport/storage position or unfolded into a substantially horizontal deployed position. In the deployed position, the sections are aligned end-to-end laterally behind a rear end of a movable frame which mounts central section. In the transport/storage position, the central section still extends laterally behind the rear end of the frame, but the pivotal wings have been folded forwardly at the ends of the central section to lie along opposite sides of the movable frame. In each folded pivotal wing, the inner wing section extends forwardly and upwardly at an angle from the central section and the outer wing section extends substantially rearwardly and horizontally from a front end of the inner wing section.
