COOLANT PRESSURE RESPONSIVE HITCH CONTROL SYSTEM FOR RAISING AND LOWERING THE HITCH

Clockwise and anticlockwise rotation of a shaft (14) and lever (26) fixed thereto lower and raise a three-point hitch via a conventional rockshaft valve and lift cylinder. Working depth of an implement on the hitch is set manually by a frictionally-restrained lever (20) coupled to the lever (26) by...

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Bibliographische Detailangaben
1. Verfasser:	ROGER JOHN NELSON
Format:	Patent
Sprache:	eng
Schlagworte:	AGRICULTURE ANIMAL HUSBANDRY ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES AUXILIARY DRIVES FOR VEHICLES FISHING FORESTRY HUMAN NECESSITIES HUNTING INSTRUMENTATION OR DASHBOARDS FOR VEHICLES PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES ORIMPLEMENTS, IN GENERAL PERFORMING OPERATIONS SOIL WORKING IN AGRICULTURE OR FORESTRY TRANSPORTING TRAPPING VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	Clockwise and anticlockwise rotation of a shaft (14) and lever (26) fixed thereto lower and raise a three-point hitch via a conventional rockshaft valve and lift cylinder. Working depth of an implement on the hitch is set manually by a frictionally-restrained lever (20) coupled to the lever (26) by a link (30) which is pivoted (32) on the lever (20) and coupled to the lever (26) by a slot (36) engaging a pin (28) on the lever (26). A bellows actuator (42) has a rod (64) which is urged to the left by a spring (68) and to the right by a differential pressure across a water pump (11) of the tractor engine (10). If the engine labours and its speed drops, the differential pressure falls, the rod (64) moves to the left, pushes the link (30) clockwise about its pivot (32) and therefore pushes the lever (26) and shaft (14) anticlockwise to raise the hitch. By thus using coolant pressure as a measure of engine speed a simple means of implementing draft load control is provided.