R-44 Rotorhead. Sorry guys I just couldn't help myself.
Surely they must be only coning hinges as the bearing surfaces are a hardened steel bush running against some form of fibre outer bush. If these areas were subject to continous movement ie once per rev then I think the wear rate would be too great for this type of bearing plus the pivot bolts are tightened to some hundred foot pounds of torque which would suggest they are not designed for a thousand or so direction changes per minute. I think they cone up to accomodate the weight of the machine and any flapping takes place in the form of bending of the blade. I dont suppose anyone has film footage of a Robinson rotor system in action do they?