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US 3,944,248 AGranted
Suspension system
OwnerArthur L. Herrmaninventor
Life of this patent
Estimating the term…
Abstract
A suspension system for a trailer unit having two pairs of support axles providing independent wheel support, each of the wheels being mounted on torsion-type axles, with means for retracting at least one of the pairs of wheels thereby allowing the remaining pair to support the entire load and wherein the torsion supporting device is so designed to permit the remaining pair of wheels to be automatically, partially retracted thereby lowering the trailer to a predetermined above ground level with added means for further lowering the trailer by additional retraction of the remaining wheel set.
Claims5
A suspension system, including:
- a. a longitudinally extending frame member;
- b. a first pair of independently mounted wheel carrying axles rotatably mounted on a forward portion of said frame;
- c. a second pair of independently mounted wheel carrying axles rotatably mounted on said frame rearwardly of said first pair of axles;
- d. torsion spring, biasing means arranged on each of said axles;
- e. said wheel carrying axles including a bellcrank arrangement for mounting of said wheels on said axles;
- f. control means arranged on each of said axles for shifting thereof with respect to said frame member;
- g. said control means including a first control member arranged to selectively shift said bellcrank member of one of said pairs of wheel carrying members with respect to said frame, whereby one of said pairs of wheel carrying axles will be shifted to a non-load carrying position;
- and
- h. said torsion spring of said other pair of mounted axles is arranged and constructed to permit compression of said torsion spring and thereby lowering of said frame with respect thereto.
6 more elements
Dependencies are inferred from the claim text.