Patent ID: 7216896

Claim:
A carriage, comprising: a central beam extending the length of the carriage; a plurality of cross beams, wherein at least one cross beam comprises: a hollow element having a first end and a second end, wherein the hollow element is coupled to and extends perpendicularly to the central beam; a first beam slidably positioned within the first end of the hollow element, wherein the first beam is coupled to at least one axle; and a second beam slidably positioned within the second end of the hollow element, wherein the second beam is coupled to at least one axle; and a hydraulic system coupled to each of the plurality of cross beams for hydraulically sliding each beam positioned within the hollow element, wherein the hydraulic system hydraulically slides each beam positioned within each hollow element away from and towards the central beam, and wherein the hydraulic system further comprises a hydraulic line coupled to the central beam on one end and a first or second beam of the hollow element on the other end, wherein the hydraulic line extends or contracts when the first or second beam slides within the hollow element.