Rotary tedder having a lifting unit
An agricultural implement includes a main frame attachable to a towing vehicle, a wheel support supporting the main frame and having main wheels, and a lifting unit configured to bring the agricultural implement into each of a transport position, a working position, and a headland position. The wheel support and the tedder frame are each pivotable around a common axle on the main frame, the lifting unit includes an adjustment assembly attached directly to the wheel support at a first attachment point and directly to the tedder frame at a second attachment point, the first attachment point and the second attachment point span the common axle and form a triangle therewith, and the lifting unit is configured to pivot the tedder frame and the wheel support around the common axle to bring the agricultural implement into a predetermined position between the working position and the headland position.
1 . An agricultural implement, comprising:
a main frame attachable to a towing vehicle,
a wheel support supporting the main frame and having a plurality of main wheels;
a tedder unit supported on a tedder frame, the tedder unit having a plurality of tines; and
a lifting unit configured to bring the agricultural implement into each of a transport position, a working position, and a headland position;
wherein the wheel support and the tedder frame are separate elements, each pivotable around a common axle on the main frame;
wherein the lifting unit comprises an adjustment assembly, the adjustment assembly being attached directly to the wheel support at a first attachment point and directly to the tedder frame at a second attachment point, the first attachment point and the second attachment point span the common axle and form a triangle therewith;
wherein the lifting unit further comprises a guide on the tedder frame; and
wherein the lifting unit is configured to pivot the tedder frame and the wheel support around the common axle to bring the agricultural implement into a predetermined position between the working position and the headland position.
2 . The agricultural implement of claim 1 , wherein the predetermined position between the working position and the headland position includes a position in which the plurality of tines of the tedder unit are lifted above ground and in which a tedder wheel of the tedder units remains on the ground.
3 . The agricultural implement of claim 1 , wherein the tedder frame comprises a guiding portion having a long hole as the guide.
4 . The agricultural implement of claim 1 , wherein the adjustment assembly is configured to adjust a relative position of the wheel support with respect to the tedder frame.
5 . The agricultural implement of claim 1 , comprising at least one central actuator connected with the guide on the tedder frame, wherein the at least one central actuator is configured to bring the agricultural implement into and out of the transport position.
6 . The agricultural implement of claim 5 , wherein the least one central actuator is configured to pivot the lifting unit around the common axle while keeping a relative position of the wheel support with respect to the tedder frame unchanged.
7 . The agricultural implement of claim 1 , wherein the adjustment assembly comprises a hydraulic actuator, a manual spindle, or a combination thereof.
8 . The agricultural implement of claim 5 , wherein the at least one central actuator comprises one or more hydraulic actuators.
9 . The agricultural implement of claim 5 , wherein the adjustment assembly, the at least one central actuator, or a combination thereof, is configured to be remotely controlled by the towing vehicle.