Adjustable automatic flex arm lockout

1. A cutter bar lockout mechanism for a header of an agricultural vehicle, said cutter bar lockout mechanism comprising:

a shaft having a first end that is coupled to a frame of the header, and a second end that is positioned either on, within or adjacent a cutter bar support arm (arm) of the header;

an upper stop that is either mounted to the shaft or forms part of the shaft and is configured to selectively interact with an upper surface of the arm;

a lower stop that is either mounted to the shaft or forms part of the shaft and is configured to selectively interact with a lower surface of the arm;

wherein the shaft is movable relative to both the frame and the arm between an unlocked position and a locked position, wherein in the unlocked position of the shaft, the upper stop and the lower stop are positioned at a location along the arm where a vertical gap exists between the arm and one or both of the upper stop and the lower stop so as to enable rotation of the arm relative to the frame, and, wherein in the locked position of the shaft, the upper stop and the lower stop are positioned at a location along the arm where the arm is sandwiched between the upper stop and the lower stop so as to either limit or prevent rotation of the arm relative to the frame.

2. The cutter bar lockout mechanism of claim 1 further comprising a handle that is pivotably connected to the shaft about a pivot axis.

3. The cutter bar lockout mechanism of claim 2 further comprising a spring that is connected to the handle and the shaft, wherein rotation of the handle causes the spring to move the shaft between the locked and unlocked positions.

4. The cutter bar lockout mechanism of claim 3 , wherein in a first rotational position of the handle, the shaft is maintained in an unlocked position, and in a second rotational position of the handle, which differs from the first rotational position, the shaft is maintained in a locked position.

5. The cutter bar lockout mechanism of claim 4 , wherein in the first rotational position of the handle, at least a portion of the spring is positioned on one side of the pivot axis of the handle, and in the second rotational position of the handle, said portion of the spring is positioned on an opposite side of the pivot axis of the handle.

6. The cutter bar lockout mechanism of claim 1 , wherein the lower stop is movably mounted to the shaft.

7. The cutter bar lockout mechanism of claim 1 , wherein the shaft is a threaded rod, and the lower and upper stops are threaded nuts that are connected to the threaded rod.

8. The cutter bar lockout mechanism of claim 1 , wherein the shaft is pivotably connected to the frame.

9. The cutter bar lockout mechanism of claim 1 , wherein the shaft is a threaded bolt and the lower stop comprises a head of the threaded bolt.

10. The cutter bar lockout mechanism of claim 9 , wherein the threaded bolt forms the second end of the shaft and a threaded coupling forms the first end of the shaft, and wherein the threaded coupling is threadedly connected to the threaded bolt, and wherein the threaded bolt is configured to be adjusted for simultaneously adjusting the positions of the upper and lower stops.

11. A combine harvester header comprising the cutter bar lockout mechanism of claim 1 .

12. A combine harvester comprising the combine harvester header of claim 11 .

13. A cutter bar lockout mechanism for a header of an agricultural vehicle, said cutter bar lockout mechanism comprising:

a shaft that having a first end that is coupled to a frame of the header, and a second end that is positioned either on, within or adjacent a cutter bar support arm (arm) of the header;

an upper stop that is either mounted to the shaft or forms part of the shaft and is configured to selectively interact with an upper surface of the arm;

a lower stop that is either mounted to the shaft or forms part of the shaft and is configured to selectively interact with a lower surface of the arm; and

a lock that is movably connected to the shaft and movable relative to both the frame and the arm between an unlocked position and a locked position, wherein in the locked position, the lock is positioned between the arm and one of the upper stop and the lower stop so as to either limit or prevent rotation of the arm relative to the frame, and wherein in the unlocked position, the lock is not positioned between the arm and one of the upper stop and the lower stop so as to enable rotation of the arm relative to the frame.

14. The cutter bar lockout mechanism of claim 13 , wherein the shaft is a threaded rod, and the lower and upper stops are threaded nuts that are connected to the threaded rod.

15. The cutter bar lockout mechanism of claim 13 , further comprising a spring having one end that is connected to the lock and another end that is connected to an actuator, wherein movement of the actuator causes the spring to move the lock between the locked and unlocked positions.

16. The cutter bar lockout mechanism of claim 15 , wherein in the locked position of the lock, at least a portion of the spring is positioned on one side of a pivot axis of the lock, and in the unlocked position of the lock, said portion of the spring is positioned on an opposite side of the pivot axis of the lock.

17. The cutter bar lockout mechanism of claim 13 , wherein the shaft is a threaded bolt and the lower stop comprises a head of the threaded bolt.

18. A combine harvester header comprising the cutter bar lockout mechanism of claim 13 .

19. A combine harvester comprising the combine harvester header of claim 18 .