The force detector may alternatively be piezo-electric, resistive, inductive, or capacitative. The strain gauges are so arranged in a hole in the linkwork that response to bending of the linkwork is eliminated. Alternatively, with potentiometer R11 at the other end of its travel, a number of strain gauges 9 arranged in a bridge circuit may maintain a constant horizontal force in the linkwork. Filter circuits (not shown) associated with rectifier 17 eliminate response to short term transients. transistor amplifier 18, the energization of electromagnets 19, 20 operating a valve 26 controlling motor 5 so that the implements are maintained in a position determined by potentiometer R9. bridge circuit with a datum setting potentiometer R9 to control through a transistor amplifier 13, a phase-sensitive rectifier 17, and a D.C. A potentiometer 10 associated with the linkwork, or a potentiometer 10a associated with a ground feeler 25, is arranged in an A.C. 1 (not shown) implements 1 are raised or lowered at the rear of a tractor 2 by means of a fluid-pressure motor 5 acting through a linkwork 8.
A01B63/1117- 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 using a hitch position sensorĪ tractor implement is moved relative to the tractor by a hydraulic system controlled by variable resistors dependent on position, and transducers dependent on load, through an electronic control system having an adjustable time constant. A01B63/1115- 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 using a mechanical ground contact sensor. 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. A01B63/12- Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by an electric motor. 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. 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 DEJ22692A priority Critical patent/DE1183295B/en Application filed by International Harverster Corp filed Critical International Harverster Corp Publication of GB1068336A publication Critical patent/GB1068336A/en Status Expired legal-status Critical Current Links Original Assignee International Harverster Corp 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.) 
Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired Application number GB43623/63A Current Assignee (The listed assignees may be inaccurate.
Info Publication number GB1068336A GB1068336A GB43623/63A GB4362363A GB1068336A GB 1068336 A GB1068336 A GB 1068336A GB 43623/63 A GB43623/63 A GB 43623/63A GB 4362363 A GB4362363 A GB 4362363A GB 1068336 A GB1068336 A GB 1068336A Authority GB United Kingdom Prior art keywords potentiometer linkwork tractor implements bridge circuit Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents An automatic position and draft control device for tractors Google Patents GB1068336A - An automatic position and draft control device for tractors Toe in toe out in tractor.GB1068336A - An automatic position and draft control device for tractors
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