Rotatable coupler for a reel arm of a reel header

A header of an agricultural harvester comprising:

• a frame;
• a reel arm connected to the frame;
• a first reel assembly connected to the frame, the first reel assembly including:
• a central rotatable shaft, and
• a plurality of tine bars extending widthwise across the first reel assembly and connected to the central rotatable shaft for rotation therewith;
• a second reel assembly connected to the frame, the second reel assembly including:
• a central rotatable shaft, and
• a plurality of tine bars extending widthwise across the second reel assembly and connected to the central rotatable shaft for rotation therewith;
• a rotatable coupler supported by the reel arm, and connected to at least one of the central rotatable shafts of the first and second reel assemblies;
• a first linkage assembly connecting the rotatable coupler to one of the plurality of tine bars of the first reel assembly;
• and
• a second linkage assembly connecting the rotatable coupler to one of the plurality of tine bars of the second reel assembly.

A header of an agricultural harvester comprising:

• a frame;
• a first reel assembly including:
• a central rotatable shaft having a longitudinal axis, and
• a plurality of tine bars extending widthwise across the first reel assembly and connected to the central rotatable shaft for rotation therewith;
• a drive mechanism operatively connected to a lateral side of the first reel assembly;
• a reel arm connected to the frame and supporting the first reel assembly about its medial side;
• a rotatable coupler having a rotational axis aligned with the longitudinal axis of the central rotatable shaft and connected to the reel arm;
• a first linkage assembly connecting the rotatable coupler to one of the plurality of tine bars of the first reel assembly;
• and
• a second linkage assembly connected to the rotatable coupler and extending medially from the first reel assembly.