Extendable frame work vehicle

摘要

An extendable frame work vehicle offering enhanced versatility, safety and effectiveness. The vehicle includes an adjustable frame with front and rear portions that extend or retract with respect to each other. The front portion is supported by a first pair of wheels and said rear portion is supported by a second pair of wheels. Each wheel is independently driven and steered. The vehicle also includes an engine mounted on the rear portion of the frame. Incorporated into the vehicle is an electro-hydraulic assembly which enables extension and retraction of the adjustable frame. The assembly includes a sensor-responsive microprocessor controller, at least one hydraulic pump, at least one hydraulic drive motor, and at least one valve network.

主权项

1. A work vehicle comprising:
(a) a frame having a first portion, a second portion and a third portion moveable relative to each other between an extended position and a retracted position; (b) a power take-off shaft located on and moveable with said third portion of said frame; (c) a hitch located on and moveable with said third portion of said frame, said hitch comprising a first four-bar linkage including a first attachment point, a second four-bar linkage including a second attachment point, at least one actuator coupled to said four-bar linkages for adjusting the position of the attachment points of the four-bar linkages, and a hydraulic cylinder coupled between said second portion of said frame and a third attachment point wherein said first, second, and third attachment points provide three points for attachment of a device to the vehicle; and (d) a dedicated hydraulic pump/motor combination that includes a main pump and an auxiliary pump for driving the power take-off shaft.