Road paver-finisher with a combination of axles with steering wheels and crawler units

Abstract

A road paver-finisher having a tractor unit and a screed unit mounted for vertical movement on and relative to the tractor unit. The tractor unit has a hopper for road material, and conveyors unload the road material from the hopper in front of the screed to be leveled by the screed. Crawler belts mounted on the tractor unit are disposed forwardly of the screed for advancing the tractor unit, and ground engaging steering wheels are mounted on the tractor unit forwardly of the crawler belts. Power devices are provided for moving the steering wheels and crawler belts vertically relative to each other thereby to control tilting of the tractor unit and hence of the screed. These power devices can move the steering wheels vertically relative to the crawler belts, or vice versa.

Dependencies are inferred from the claim text.