US Pat. No. 10,214,874

METHOD AND ARRANGEMENT RELATED TO A ROTATOR

Indexator Rotator Systems...

1. An arrangement related to a rotator, whereby the rotator (10) comprises a stator (20) and a rotor (30), characterized in that the arrangement comprises a fastening ring (50) for attaching a work tool, and that a bearing (D) is arranged between the stator (20) and the fastening ring (50),wherein the fastening ring (50) for the attaching of a work tool is separately journalled relative to the stator (20) independently of a bearing (B, C) between the stator (20) and the rotor (30), and
a driver (80; 180; 280) for transferring the rotational movement of the rotor (30) to the fastening ring (50),
wherein the driver (80) is movable laterally relative to the rotor (30), or the fastening ring (50), or both, in order to eliminate stressing conflict between the bearings (B,C) between the stator (20) and the rotor (30), and
at least one radially outwardly extending tab on said driver received in at least one corresponding recess in said fastening ring, and at least one radially inwardly extending tab on said driver received in at least one corresponding recess in said rotor, said radially outwardly and inwardly extending tabs and corresponding recesses being arranged to enable lateral movement of said driver relative to said rotor, or said fastening ring, or both.