Patent ID: 6959936

Claim:
An apparatus comprising: a coupling device coupled to an axle and to a vehicle frame at an approximate centerline location, the coupling device providing spaced apart discrete fixed suspension pivot points for the axle with respect to the frame according to a lateral inclination of the axle, the coupling device holding the frame to the axle while at the same time allowing the axle to pivot about a first discrete fixed pivot point at the centerline location within the coupling device while the axle is within a first articulation range, the coupling device further compressing and decompressing in a vertical direction to allow an overall position of the axle to move vertically up and down in the coupling device when the axle is within a second articulation range outside of the first articulation range allowing a pivot point for the axle to move from the first discrete fixed pivot point directly to a second spaced apart laterally extended discrete fixed pivot point at a lateral end location on the axle where the axle first contacts a lateral end of the frame.