All terrain/high speed undercarriage

摘要

An undercarriage (12) includes a primary frame (22) and a plurality of secondary frames (26) which in turn carry wheel members (28). The secondary frames (26) are urged to pivot away from the primary frame (12) by spring mechanisms (38). The center secondary frames (26c) are each biased outwardly by two spring mechanisms (38) while the endmost secondary frames (26e) are biased outwardly by a single spring mechanism (38). An undercarriage (112) includes a primary frame (122) and a plurality of secondary frames (126) which in turn carry wheel members (128). Pivotal movement of the endmost secondary frames (126e) is controlled by spring/shock absorber assemblies (134). Pivotal movement of the center secondary frame (126c) is controlled by a spring/shock absorber/cylinder assembly (136) which selectively positions the center wheel member (128) below the end wheel member to facilitate skid steering, or in alignment with the end wheel members to facilitate high speed operation.