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

Claim 0:
1. A heavy haul trailer dolly having a steering system, the dolly comprising:
a main frame;
a turntable mounted on the main frame;
a wheel group pivotally connected to the main frame;
a pivot frame pivotally connected to the main frame located between the turntable and the wheel group;
a counter-steering linkage between the turntable and the pivot frame, comprising:
a stinger bar mounted centrally across the turntable, and
a compensator bar mounted centrally within the pivot frame and being extendable through the pivot frame, the compensator bar pivotally connected to an end of the stinger bar such that when the dolly is not being turned, the stinger bar and the compensator bar are aligned with a longitudinal center line of said 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 too said first side of said wheel group;
each cylinder being 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 each cylinder being operable to vary in length a piston associated with the cylinder for directly controlling the steering of the wheel group.