Patent ID: 7971420

Claim:
In a draper platform ( 102 ) having an elongate, laterally extending frame ( 110 ), a suspension system comprises: first and second gauge wheels ( 218 , 220 ), comprising one gauge wheel ( 218 ) located on the left side of the draper platform ( 102 ) and another gauge wheel ( 220 ) located on the right side of the draper platform ( 102 ); first and second hydraulic cylinders, wherein the first hydraulic cylinder ( 306 ) is mechanically coupled to the left side gauge wheel ( 218 ), and further wherein the second hydraulic cylinder ( 510 ) is mechanically coupled to the right side gauge wheel ( 220 ); third and fourth hydraulic cylinders disposed to support a central portion of the frame ( 110 ) on the feederhouse ( 104 ) wherein the third hydraulic cylinder ( 406 ) is disposed to support the frame at the left side of a feederhouse and the fourth hydraulic cylinder ( 512 ) is disposed to support the frame at the right side of the feederhouse; a first hydraulic circuit ( 502 ) comprising a first gas-charged accumulator ( 506 ) in fluid communication with the first hydraulic cylinder ( 306 ) and in fluid communication with the third hydraulic cylinder ( 406 ), a first hydraulic valve ( 518 ) in fluid communication with the first gas-charged accumulator ( 506 ) and the first and third hydraulic cylinders ( 306 , 406 ), wherein the first hydraulic valve ( 518 ) is configured to control the flow of hydraulic fluid into and out of the first hydraulic circuit; a second hydraulic circuit ( 504 ) comprises a second gas-charged accumulator ( 514 ) in fluid communication with the second hydraulic cylinder ( 510 ) and in fluid communication with the fourth hydraulic cylinder ( 512 ), a second hydraulic valve ( 520 ) in fluid communication with the second gas-charged accumulator ( 514 ) and the second and fourth hydraulic cylinders ( 510 , 512 ) wherein the second hydraulic valve ( 520 is configured to control the flow of hydraulic fluid into and out the second hydraulic circuit.