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1. 发明授权

US3897832A Agricultural tool bar 失效
公开(公告)号：US3897832A
公开(公告)日：1975-08-05
申请号：US49825674
申请日：1974-08-19
申请人： DUNHAM LEHR INC
发明人： LEEDAHL ALTON O , WILHELM THOMAS K , KRIZEK JOHN L
IPC分类号： A01B73/04 , A01B49/00 , A01B59/044 , A01B73/00
CPC分类号： A01B73/044
摘要： An agricultural tool bar comprising a wheeled center frame having a first wing frame pivotally connected about a horizontal axis to one end thereof and a second wing frame pivotally connected about a horizontal axis to the other end thereof. The center frame comprises a pair of longitudinally extending and spaced apart frame members having rearward and forward ends. A tongue tube is rotatably secured to the first and second frame members at the forward ends thereof and has a forwardly extending tongue secured thereto for connection to the prime mover such as a tractor or the like. An axle tube is rotatably secured to the rearward ends of the first and second frame members and has rearwardly extending wheel arms secured thereto adjacent the outer ends thereof. A transport wheel is rotatably secured to each of the wheel arms. A bell-crank means is rotatably mounted on the center frame and comprises an actuator plate having opposite ends which are pivotally connected to actuator arms extending therefrom. The outer ends of the actuator arms are operatively connected to the wing frames by means of a ''''float'''' connector so that rotation of the actuator plate will cause the wing frames to pivot relatively to the center frame. A length adjustable link arm is operatively pivotally secured at its rearward end to the actuator plate and is pivotally secured at its forward end to the tongue tube so that rotation of the actuator plate causes the tongue tube to rotate relatively to the center frame to raise or lower the forward end of the center frame. A link arm also pivotally connects the actuator plate with the axle tube so that rotation of the actuator plate causes the axle tube to rotate relative to the center frame to raise or lower the same. A hydraulic cylinder means is connected to the actuator plate for selectively rotating the actuator plate. The relationship of the tongue tube, axle tube, bell-crank apparatus and float connectors is such that the center frame means is initially raised relatively to the ground with the wing frames then being raised and pivoted upwardly to a transport position.

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