A TOP DRIVE APPARATUS

摘要

A method and apparatus for clamping together a rotor of a top drive (TS) and an item threaded thereto to inhibit relative rotation between the two tu bulars, the method comprising the steps of clamping the rotor to the item 5 (108) with a clamp (100), the rotor (50) having a projection (122) and the i tem (90,103,106,110) having a further projection (121) and the clamp (100,10 1,102) having a receiver (178) to receive the projection (122) and further p rojection (121) to inhibit rotation bet ween (10) the rotor (50) and the ite m (90,103,106,110).