Vehicle suspension with adjustable tandem axles

Claim 1

In combination with a vehicle body, a suspension comprising tandem pairs of wheels, and means including a pair of axles supporting said body by transmission of loading to the wheels, the axles having generally parallel axes and two wheels being carried by each axle and eccentrically with respect to the axle axis so that the two axles tend to rotate bodily about said axes in response to imposition of body weight. said means including structure interconnecting the axles for yieldably resisting said axle rotation, and said structure having an adjustment operable to rotate both axles simultaneously for raising or lowering the body relative to all wheels, said structure including arms on said axles, at least one compression spring through which loading is transmitted between said arms, and said adjustment including interfitting threaded members through which loading is transmitted between the arms, one of said members being rotatable relative to the other to vary the spacing between said arms and thereby adjust the height of the vehicle body for a given body load, said arms projecting upright below the vehicle body and said one member being openly exposed for manually adjustable rotation at a location between said upright arms. said body supporting means including spaced flanges attached to and projecting downwardly from the body, said axles being supported by said flanges, substantially below body level, and adjustable means for maintaining the axles centered relative to said flanges, said upright arms being located between said flanges, said structure including load transmitting pin elements connected to said arms, there being at least two separate hole locations at which one pin element is connectable to one arm, said locations being at different distances from the axis of the axle associated with said one arm.