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AssigneeThe Boler Company
InventorsMichael J. Gottschalk, Michael J. Keeler
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A twin beam parallelogram-type lift axle suspension system includes a bi-directional airlift spring having opposite end plates at either end thereof located between two parallel control arms wherein expansion of the air spring pivots the upper and lower control arms with respect to a frame bracket thereby lifting an axle and wheels attached thereto from engagement with the road surface. The end plates of the bi-directional air spring move about equally in opposite directions and remain substantially parallel to one another throughout expansion and contraction of the air spring so as to about equally distribute forces of expansion of the air spring between the upper and lower control arms. The system of the instant invention also includes a shock absorber having one end attached to the upper control arm and another end attached to the lower control arm so as to locate the shock absorber forward of the axle thereby minimizing shock travel and maximizing shock life. The upper control arm is pivotally connected to an axle seat by a bolt including an eccentric cam mechanism which allows one to adjust the caster angle of the axle when the need arises.
In a wheel bearing, lift axle suspension system for a wheeled vehicle which includes at least two non-liftable wheel bearing suspensions providing the primary means of support for road engagement of said vehicle, the lift axle suspension system comprising a frame bracket, upper and lower control arms having first ends pivotally attached to said frame bracket at pivot points and second ends attached to an axle connection means, and means for raising and lowering said wheels of said lift axle suspension into and out of engagement with the road surface, the improvement comprises:
An axle suspension system for a wheeled vehicle, comprising:
An axle suspension system for a wheeled vehicle, comprising:
Dependencies are inferred from the claim text.