US Patent 7104558 Skate truck assembly

A skate truck assembly apparatus provides a hanger engaging separate left and right collinearly aligned axles, and at least three pairs of suspension bushings, with one selected pair of said bushings appropriate to a chosen dynamic load, secured by a kingpin; a base receiving the kingpin in adjustable engagement, thereby mounting the hanger and the at least one suspension bushing in flexible securement on the base; a pivot rod engaged with the hanger and extending therefrom into a rod recess within the base positionally distant from the kingpin.