Agricultural header with one or more movable wing sections

1. An agricultural header, comprising:

a main section including a main frame carrying at least one flexible cutting element;

at least one wing section pivotably coupled to said main section and including a wing frame; and

a linkage pivotably coupling said at least one wing section to said main section, said linkage including an upper bar and a lower bar which are both coupled to said main frame and said wing frame, at least one of said upper bar or said lower bar coupling a pivot of said main section to a pivot of said at least one wing section, said upper bar defining an upper bar axis and said lower bar defining a lower bar axis which is non-parallel to said upper bar axis, said wing frame supporting said at least one cutting element such that pivotable movement of said at least one wing section causes a corresponding flexure of said at least one cutting element.

2. The agricultural header of claim 1 , wherein said at least one wing section defines a wing longitudinal axis, at least one of said upper bar axis and said lower bar axis being non-parallel to said wing longitudinal axis.

3. The agricultural header of claim 2 , wherein said upper bar axis and said lower bar axis are both non-parallel to said wing longitudinal axis.

4. The agricultural header of claim 1 , wherein said main section includes an upper main pivot and a lower main pivot and said at least one wing section includes an upper wing pivot and a lower wing pivot, said upper bar being coupled to said upper main pivot and said upper wing pivot and said lower bar being coupled to said lower main pivot and said lower wing pivot.

5. The agricultural header of claim 4 , wherein said upper bar defines an upper bar length and said lower bar defines a lower bar length which is equal to said upper bar length.

6. The agricultural header of claim 1 , wherein said linkage is configured to maintain said upper bar axis and said lower bar axis in a non-parallel relationship regardless of an orientation of said at least one wing section relative to said main section.

7. The agricultural header of claim 1 , further comprising an actuator coupling said upper bar to said lower bar.

8. An agricultural header, comprising:

a main section including a main frame carrying at least one flexible cutting element;

at least one segment section pivotably coupled to said main section and including a segment frame; and

a linkage pivotably coupling said at least one segment section to said main section, said linkage including an upper bar and a lower bar which are both coupled to said main frame and said segment frame, at least one of said upper bar or said lower bar coupling a pivot of said main section to a pivot of said at least one segment section, said segment frame supporting said at least one cutting element such that pivotable movement of said at least one segment section causes a corresponding flexure of said at least one cutting element.

9. The agricultural header of claim 8 , wherein said segment frame is substantially rigid.

10. The agricultural header of claim 8 , further comprising an actuator coupled to at least one of said upper bar and said lower bar.

11. The agricultural header of claim 10 , wherein said actuator couples said upper bar to said lower bar.

12. The agricultural header of claim 8 , wherein said at least one segment section comprises a first segment section pivotably coupled to said main section and a second segment section pivotably coupled to said first segment section.

13. The agricultural header of claim 12 , further comprising a second linkage pivotably coupling said second segment section to said first segment section, said second linkage including a second upper bar and a second lower bar which are both coupled to said second segment section and said first segment section.

14. The agricultural header of claim 13 , further comprising an actuator coupled to at least one of said upper bar, said lower bar, and said first segment section and a second actuator coupled to at least one of said second upper bar, said second lower bar, and said second segment section.

15. The agricultural header of claim 14 , wherein said second actuator couples said second upper bar to said second lower bar.

16. The agricultural header of claim 13 , wherein said upper bar defines an upper bar axis, said lower bar defines a lower bar axis which is parallel to said upper bar axis, said second upper bar defines a second upper bar axis, and said second lower bar defines a second lower bar axis which is parallel to said second upper bar axis.

17. The agricultural header of claim 13 , wherein:

said upper bar defines an upper bar axis,

said lower bar defines a lower bar axis,

said second upper bar defines a second upper bar axis,

said second lower bar defines a second lower bar axis, and

said upper bar axis and said lower bar axis are non-parallel to said second upper bar axis and said second lower bar axis.

18. The agricultural header of claim 8 , wherein said upper bar defines an upper bar axis and said lower bar defines a lower bar axis which is parallel to said upper bar axis.

19. The agricultural header of claim 8 , wherein said main frame includes an upper main bar pivotably coupled to said upper bar and a lower main bar pivotably coupled to said lower bar.