Abstract: A distributed drive includes a frame, a main sprocket, and a plurality of drive assemblies mounted therearound for rotation of the main sprocket. The main sprocket has a circumferential drive rim around which the drive assemblies are mounted in driving engagement with the drive rim so as to selectively rotate the main sprocket relative to the frame. Each drive assembly includes at least two auxiliary sprockets lying substantially in the plane of the main sprocket. An endless belt is mounted around the auxiliary sprockets so that a span of the endless belt spans between a pair of the auxiliary sprockets in an arc-of-contact with the drive rim. At least one of the two auxiliary sprockets is a selectively driven drive sprocket for selective rotation of the main sprocket.

Abstract: A power tong includes a rotor, driven by a primary drive, for spinning and torquing threaded connections of a tubular gripped in the rotor. A grip in the rotor grips the tubular. A serpentine member supplies power to actuate the grip. The serpentine member is driven by a secondary drive. The primary and secondary drives are mounted on a stator frame. The rotor is rotatably mounted to the stator frame and driven by the primary drive during continuous three hundred and sixty degrees of rotation. A fixed or backup jaw may also be mounted to the stator frame. Tubular grippers on the fixed jaw grip a first side of a tubular joint. The grip on the rotor grips the opposite side of the tubular joint. High torque low-rotational speed applied to the rotor torques the joint. Low torque high-rotational speed applied to the rotor spins the joint.