Patent ID: 7735841

Claim:
A suspension system, comprising: a first rocker arm having a first skate wheel connection at first distal end; a second rocker arm having a second skate wheel connection at a second distal end; a spring housing; a pivoting axle connection, the pivoting axle connection pivotally connecting the first rocker arm at a first proximal end and the second rocker arm at a second proximal end, and forming a bottom of the spring housing; the spring housing further including two lateral side walls at the first and second proximal end of the respective first and second rocker arms; the lateral side walls include a plurality of flanges that are-aligned laterally along the lateral side walls; and a spring comprised of polyurethane, including: a top surface that includes two lateral edge depressions that securely abut a lip; two lateral side surfaces that include a plurality of notches that are aligned laterally, and abut the plurality of flanges; and a bottom surface that abuts the pivoting axle connection; the spring contacting the first rocker arm and the second rocker arm and biasing the rocker arms so that the rocker arms counter-rotate about the pivoting axle.