US 9,809,074 B2
Trailing axle suspension system
Brooks Strong, Houston, TX (US); and Joshua Cayne Fisher, Montgomery, TX (US)
Filed by Brooks Strong, Houston, TX (US); and Joshua Cayne Fisher, Montgomery, TX (US)
Filed on Mar. 19, 2016, as Appl. No. 15/75,117.
Prior Publication US 2017/0267043 A1, Sep. 21, 2017
Int. Cl. B60G 11/28 (2006.01); B62D 61/12 (2006.01); B60G 9/02 (2006.01)
CPC B60G 11/28 (2013.01) [B60G 9/02 (2013.01); B62D 61/125 (2013.01); B60G 2200/314 (2013.01); B60G 2202/152 (2013.01); B60G 2300/402 (2013.01)] 51 Claims
OG exemplary drawing
 
1. A trailing axle suspension system comprising
an auxiliary chassis,
an axle suspension system suspending a trailing axle from the auxiliary chassis wherein the trailing axle has wheels that each has a pneumatic tire,
an auxiliary chassis suspension system (a) pivotally supporting the auxiliary chassis for swinging movement about a first pivot axis transverse to the auxiliary chassis and (b) adapted to suspend the auxiliary chassis from a motor vehicle chassis for swinging movement about a second pivot axis transverse to the motor vehicle chassis,
the axle suspension system and auxiliary chassis suspension system are adapted to cooperatively establish the auxiliary chassis and trailing axle in (a) a stowed condition on the motor vehicle and (b) a deployed condition at a location rearward of the motor vehicle chassis and then forcibly cause the auxiliary chassis to help support the motor vehicle chassis with the trailing axle, and
the auxiliary chassis suspension system includes a load-bearing member adapted to be engaged by the auxiliary chassis in the deployed condition at a location substantially closer to the trailing axle than the pivotal support of the auxiliary chassis for swinging movement about the first pivot axis and thereby bear a major portion of the force causing the auxiliary chassis to help support the motor vehicle chassis with the trailing axle.