Patent ID: 11932069
Assignee: UNIVERSAL AIR, INC.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A spring being adjustable to have first and second different spring rates at a same height for supporting a load at a ride height, the spring comprising:
a first airbag spring having a first non linear spring rate, the first airbag spring defining a first linear deflection axis wherein the first airbag is traversed along the first linear deflection axis between a first position under a first load and a second position under a second load;
a second airbag spring stacked on the first airbag spring in series so that both the first and second airbag springs simultaneously compresses as the load increases, the second airbag spring having a second non linear spring rate, the second airbag spring defining a second linear deflection axis wherein the second airbag spring is traversed along the second linear deflection axis between a first position under the first load and a second position under the second load, the first and second linear deflection axes being coaxially aligned;
an air source for providing compressed air to the first and second airbag springs;
a manifold in fluid connection with the first and second airbag springs and the air source for providing the compressed air to the first and second airbag springs;
a plurality of valves inline with the first and second airbag springs for providing the compressed air selectively to the first and second airbag springs;
a controller connected to the manifold and valves for opening and closing one or more of the plurality of valves for filling and releasing air from the first and second airbag springs,
wherein a first height of the first airbag spring is different from a first height of the second airbag spring, a second height of the first airbag spring is different from a second height of the second airbag spring, and the first height of the first airbag spring plus the first height of the second airbag is equal to the second height of the first airbag spring plus the second height of the second airbag spring while the ride height remains the same when the first and second airbags are at the first heights and the second heights.