Patent ID: 11952036
Assignee: ASPEN CUSTOM TRAILERS INC.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 5:
6. A heavy haul trailer unit having a steering system, the trailer unit comprising:
a main frame;
a pivot attachment for pivotally connecting the trailer unit to another trailer unit;
a wheel group pivotally connected to the main frame;
a pivot frame pivotally connected to the main frame;
a counter-steering linkage between the pivot attachment and the pivot frame comprising a stinger bar mounted centrally across a turntable and a compensator bar alignable with a center line of the dolly; and
a pair of hydraulic cylinders connecting the pivot frame and the wheel group, a first of said hydraulic cylinders having a first end connected to a first side of said pivot frame and having a second end connected to said wheel group on a first side of said wheel group, a second of said hydraulic cylinders having a first end connected to a second side of said pivot frame, said second side of said pivot frame being opposite said first side of said pivot frame, and a having a second end connected to said wheel group on a second side of said wheel group, said second side of said wheel group being opposite to said first side of said wheel group;
each cylinder being selectively lockable in a fixed length so as to act as a fixed length mechanical linkage between the pivot frame and the wheel group for automatically counter-steering the wheel group, and being selectively operable to controllably vary in extended length a piston associated with the cylinder whereby pivoting of the wheel group may be controlled by extended lengths of pairs of pistons respectively associated with the cylinders.