Patent ID: 7866671

Claim:
An automatic leveling vehicle comprising: a front frame section and a rear frame section interconnected by a swivel joint which permits pivotable movement of said front frame section relative to said rear frame section about a generally horizontal axis extending longitudinally of the vehicle; a left front wheel and a right front wheel connected to said front frame section; a right rear wheel assembly and a left rear wheel assembly connected to said rear frame section; a gear train attached to said rear frame section; a right rear axle assembly operatively interconnecting said gear train and said right rear wheel assembly; a left rear axle assembly operatively interconnecting said gear train and said left rear wheel assembly; a lever arm operatively connected to said gear train for controlling the position of said right and left rear axle assemblies; selective movement of said lever arm causing said right and left rear axle assemblies to move said right and left rear wheel assemblies up or down in opposite directions; a length-adjustable member operatively connected to said lever arm for positioning the same responsive to leveling signals applied thereto; a level detector for producing and applying leveling signals to said length-adjustable member; wherein said leveling signals cause said length-adjustable member to position said lever arm such that said rear frame section is maintained in a relatively level orientation when said rear wheel assemblies encounters an uneven terrain.