Variable wheelbase road truck

Land vehicles – Wheeled – Running gear

Patent

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Details

180 2402, B62D 3308

Patent

active

042046971

ABSTRACT:
A dump truck or other truck having a rigid chassis and a front and a rear axle assemblies secured at fixed points along the chassis, wherein this truck is distinctively provided with a supplementary axle assembly displaceable behind the conventional rear axle assembly lengthwise of the truck chassis, between a position protracting rearward from the latter to increase the payload rating of the truck and a retracted position under the rear of the chassis for unhindered dumping operation. The supplementary axle assembly is also vertically adjustable between an off-the-ground position for the empty return trips, a normal suspension position for the increased payload rating, and a stiffer suspension position for increased loading on the front axle and steering maneuverability. This truck includes a supplementary frame slidably connected to the chassis, and hydraulic cylinder slidably actuating this frame, and an adjustable suspension interposed between the supplementary axle assembly and frame for the afore-mentioned vertical adjustment.

REFERENCES:
patent: 3838885 (1974-10-01), Brennan
patent: 3895818 (1975-07-01), Fearon

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