A conventional means of controlling the draft load on the vehicle produced by the ground-engaging implement is to utilize servodraft control systems.Īs the lawn and garden tractor has grown in size, it has become increasingly popular to utilize three-point hitch assemblies for the attachment of ground-engaging implements thereto. The vehicle is subjected to draft loads which are a result of ground resistance to the ground-engaging implement. It is customary for large vehicles, such as large farm tractors to utilize a three-point hitch for the attachment of implements. This invention relates to draft controls, and more particularly, to mechanically load-responsive three-point hitch draft controls. A draft control mechanism as claimed in claims 3 or 4, further comprising means to lock out said draft control mechanism. (h) draft load sensing means for receiving draft loads from said upper hitch arm and mechanically translating said draft load to an angular displacement of said first shaft when said draft load exceeds a predetermined amount.ĥ. (1) a lift pillow placed around said first shaft and rotatable thereon, said lift pillow to have an abutting surface to abut said lift arm and (f) first means for raising or lowering said lift arms, including: A draft control mechanism for tractors having three-point hitching means for the attachment of ground-engaging implements to said tractor, comprising: (4) third means for translating pivotal motion of said first linking member about said second support means to a rotation of said second linking member whereby excessive draft loads are received by said upper hitch arm to pivotally displace said first linking member.Ĥ. (3) a second linking member fixably mounted around said first shaft and (2) second support means for pivotally supporting said first linking member (1) a first linking member pivotally mounted to said upper hitch arm (h) draft load sensing means for receiving draft loads from said upper hitch arm and mechanically translating said draft load to an angular displacement of said first shaft when said draft load exceeds a predetermined amount, including: (f) first means for raising or lowering said lift arms (e) means for communicating motion of said lift arm to said lower hitch arms (d) lift arm fixably mounted to said shaft (c) first support means for rotatably supporting said first shaft to said rearward end of said tractor such that said shaft extends transverse to said tractor (a) a plurality of lower hitch arms, each hitch arm pivotally mounted rearwardly on said tractor (c) a screw in threaded engagement with said second linking member such that said screw can abut said stop pin.ģ. (b) a stop pin fixably mounted to said plate members and extending generally perpendicular thereto (a) a plurality of plate members fixably mounted to said first shaft such that said second linking members are therebetween A draft control mechanism as claimed in claim 1 wherein said transferring means, comprises: (m) means for transferring rotation of said second linking member to rotation of said first shaft.Ģ. (l) a second linking member rotatably mounted on said first shaft having an abutting surface to said pin of said first linking member such that movement of said pin in said slot will cause said second linking member to rotate on said first shaft (k) a plurality of first linking members pivotally mounted between said linking plate members, said first linking members including a pin extending generally perpendicular therefrom into said slots of said linking plate members, said upper hitch arm to be pivotally mounted to and between said first linking members such that generally linear displacement of said upper link arm causes said first linking members to pivot resulting in movement of said pin in said slots
![3 point hitch draft control 3 point hitch draft control](http://salesmanual.deere.com/sales/salesmanual/images/NA/tractors/features_attachment/03_series/6403-aa2.gif)
(j) a plurality of plate linking members fixably mounted to said second shaft and extending generally perpendicular thereto, said plate members to a cooperatively aligned slots therein (h) means for raising said lift arms, said lift arms to rest on said means
![3 point hitch draft control 3 point hitch draft control](http://www.tractordata.com/articles/technical/threepoint.jpg)
(g) means for communicating motion of said lift arm to said lower hitch arms: (f) a plurality of lift arms fixably mounted to said first shaft
![3 point hitch draft control 3 point hitch draft control](https://www.picclickimg.com/d/l400/pict/401706560068_/Massey-Ferguson-Tractor-3-Point-Hitch-Lever-Lock-Knob-Draft.jpg)
(d) support means for rotatably supporting said first shaft to said rearward end of said tractor such that said first shaft extends generally transversely to said tractor, and for fixably supporting said second shaft to said tractor generally parallel to and forwardly displaced from said first shaft (a) a plurality of lower hitch arms, each lower hitch arm pivotally mounted rearwardly on said tractor A draft control mechanism for tractors having three-point hitch means for attachment of ground-engaging implements to said tractor, comprising: