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

Claim 3:
4. A method of operating a spring to have different spring rates with a same height for supporting a load at a ride height, the method comprising the steps of:
providing a spring, the spring being capable of an adjustable spring rate at the same height so that the spring has a first spring rate at a first height or adjustable to a second spring rate at the first 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, 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;
and a controller connected to the manifold and a plurality of valves for filling and releasing air from the first and second airbag spring;
filling the first airbag spring and the second airbag spring so that the first airbag spring has a height and the second airbag spring has a height, a height of the first airbag spring being different than a height of the second airbag spring, the height of the first airbag spring plus the height of the second airbag spring having a cumulative height; adjusting an amount of air in the first and second airbag springs to adjust a spring rate of the spring while the cumulative height remains the same,
wherein the adjusting step fills or releases air from the first and second airbag springs so that 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.