| 摘要 |
The present invention relates to a center-line trenching system for use at the earth's surface such as on a paved street, road, highway or the like. The system includes a rubber tired drive machine movable over the earth's surface for advancing a side-by-side tandem of a earth saw and a conveyor attached to a rear surface of the drive machine. The conveyor includes a subframe and an elongated main frame. The subframe comprises a pair of longitudinally extending truss members pivotly attached to the drive machine at a first pivot axis of rotation that is fixed in elevation relative to the earth's surface. The main frame includes a pair of rail members pivotally mounted at near end regions to the truss members at a second axis of rotation, and has trailing end regions that define the remote termini of the conveyor. A hydrostatic actuator is pivotally mounted between the subframe and the main frame. An on-site wheel subassembly pivotally attached to the subframe having a pair of swivel wheels in rolling contact with the earth's surface during an active state of the conveyor and in an up-folded position well above the earth's surface during a trailering state of the conveyor, completes the assembly. Mounted to the rail members of the main frame is a pair of rubber tired, trailering wheels for the purpose of trailering the conveyer to a job site during the trailering state of use of the conveyor but positionable above the earth's surface during the active state of the conveyor.
|
