Leaf spring lift axle suspension system
AssigneeTurner Quick-Lift Corporation
InventorErvin K. VanDenberg
Life of this patent
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Abstract
An upwardly biasing back-to-back, quarter-elliptic, diverging pair of leaf springs are employed as the lifting mechanism in a lift axle suspension system for wheeled vehicles. The springs normally bias the lift axle off of the road surface. By inflation of air bags, the wheels are lowered into engagement with the road surface against the normal upward bias of the leaf springs. Release of the air automatically retracts the wheels to their riding, lift position.
Claims11
In a lift axle suspension system for a frame membered wheeled vehicle, including normally upwardly biasing means for raising a wheel-bearing axle of said vehicle from the road surface and means for lowering the wheel-bearing axle into road surface engagement by acting against the normal bias of said normally upwardly biasing means, the improvement comprising as said normally upwardly biasing means:
- a first and second leaf spring connected at one of their ends to each other;
- said first leaf spring having its opposite end connected to the frame of the vehicle;
- and
- said second leaf spring having its opposite end connected to the wheel-bearing axle.
Dependencies are inferred from the claim text.