Status report on TRANSIMS development

A crop harvesting machine including a longitudinal frame portion adapted at its forward end for attachment to a draft vehicle, a transverse frame portion fixed at its left end to the rearward end of the longitudinal portion, a pair of upright frame members fixed to opposite sides of the transverse frame portion, a pair of transversely spaced wheel arms connected to the transverse frame portion for vertical swinging movement and having ground-engaging wheels rotatably mounted thereon, extensible and retractable means acting between the upright frame members and the wheel arms to vertically swing the latter and thereby raise and lower the frame relative to the ground, a header subframe carrying crop harvesting elements thereon, the header extending longitudinally above the transverse frame portion and between the upright frame members, upper and lower links mounting the header on the frame, the upper links extending between the header and the upper ends of the upright frame members and the lower links extending between the header and the wheel arms, and elongated springs acting between the transverse frame portion and the header to urge the latter upwardly relative to the former. In one embodiment, the springs extend between the upper ends of the upright frame members and the header, and in another embodiment, the springs extend between the upper links and the header.