1 is a section view of the rear portion of a tractor embodying a draft sensing hitch system used with the present invention and. The above and additional objects and advantages of the pres-ent invention will become apparent to those skilled in the art from a consideration of the following detailed description when taken in conjunction with the accompanying drawings. Likewise, when the draft load decreases, the sensor signals the pilot-operated valve which am~lifies the signal to cause the draft links to be lowered. When the draft load increases, a draft sensor signals the pilot-operated valve which amplifies the signal to cause the draft links to be raised. The valve is highly sensi-tive to deviations in the draft load and corrects the position of the draft links accordingly. Summary of the Invention It is a general object of the present invention to provide hydraulic draft load control incorporating a pilot-operated valve, for maintaining a desired draft load. Prior art hitch systems have generally provided for draft sensing connected directly to the control mechanism as disclosed in the U.S. The present invention relates generally to a hitch system of the type which is responsive to draft loads to adjust the working depth of an implement connected thereto to maintain a preselected draft force and more particularly relates to draft control using a pilot-operated hydraulic valve which increases the sensitivity of the direction control mechanism to deviations in the draft load. A01B63/112- Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements to control draught load, i.e.A01B63/111- Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements.
A01B63/10- Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means.A01B63/02- Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors.A01B63/00- Lifting or adjusting devices or arrangements for agricultural machines or implements.A01B- SOIL WORKING IN AGRICULTURE OR FORESTRY PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL.A01- AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING.238000006011 modification reaction Methods 0.000 description 2.241001236653 Lavinia exilicauda Species 0.000 abstract description 4.238000007906 compression Methods 0.000 claims description 2.230000003247 decreasing Effects 0.000 claims description 4.238000004891 communication Methods 0.000 claims description 14.239000012530 fluid Substances 0.000 claims abstract description 51.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to US05/601,659 priority Critical patent/US4057109A/en Application filed by Deere and Co filed Critical Deere and Co Application granted granted Critical Publication of CA1049894A publication Critical patent/CA1049894A/en Status Expired legal-status Critical Current Links Original Assignee Deere and Co Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Nelson Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired Application number CA256,353A Other languages French ( fr) Info Publication number CA1049894A CA1049894A CA256,353A CA256353A CA1049894A CA 1049894 A CA1049894 A CA 1049894A CA 256353 A CA256353 A CA 256353A CA 1049894 A CA1049894 A CA 1049894A Authority CA Canada Prior art keywords draft control main piston means fluid Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents CA1049894A - Hydraulic draft control
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