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A top drive well drilling apparatus includes a body with means for suspending the body from a drilling rig. A motor is secured to the body. The motor has a central passage defining a rotational axis. The central passage is adapted to receive a tubular drive shaft. A pipe gripping assembly is provide

A top drive well drilling apparatus includes a body with means for suspending the body from a drilling rig. A motor is secured to the body. The motor has a central passage defining a rotational axis. The central passage is adapted to receive a tubular drive shaft. A pipe gripping assembly is provided which underlies and is in axial alignment with the central passage. The pipe gripping assembly rotates independent of the motor for purposes of orientation.

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1. A top drive well drilling apparatus comprising:a body with means for suspending the body from a drilling rig;a motor secured to the body, the motor having a central passage defining a rotational axis, the central passage being adapted to receive a tubular drive shaft;a pipe gripping assembly whic

1. A top drive well drilling apparatus comprising:a body with means for suspending the body from a drilling rig;a motor secured to the body, the motor having a central passage defining a rotational axis, the central passage being adapted to receive a tubular drive shaft;a pipe gripping assembly which underlies and is in axial alignment with the central passage; andmeans for rotating the pipe gripping assembly independent of the motor for orientation of the pipe gripping assembly;means being provided for moving the body laterally whereby the pipe gripping assembly can be moved into engagement with a pipe in a mouse hole of the drilling rig; andthe means for moving the body laterally including a travel member which moves substantially vertically up and down the drilling rig, a torque restraint arm being pivotally mounted to the travel member and pivotally mounted to the body, the torque restraint arm being angularly adjustable by means of a first fluid actuated extendible cylinder, thereby moving the body laterally.2. A top drive well drilling apparatus comprising:a body with means for suspending the body from a drilling rig;a motor secured to the body, the motor having a central passage defining a rotational axis, the central passage being adapted to receive a tubular drive shaft;a pipe gripping assembly which underlies and is in axial alignment with the central passage; andmeans for rotating the pipe gripping assembly independent of the motor for orientation of the pipe gripping assembly, and the means for rotating the pipe gripping assembly including a ring gear on the pipe gripping assembly which is driven by a pinion gear rotated by an auxiliary motor.3. The apparatus as defined in claim 2, wherein the pipe gripping assembly includes pipe jaws, the pipe gripping assembly being telescopically adjustable to vary the positioning of the pipe jaws axially along the rotational axis, means being provided to maintain the pipe gripping assembly in a selected telescopic position.4. A top drive well drilling apparatus comprising:a body with means for suspending the body from a drilling rig;a motor secured to the body, the motor having a central passage defining a rotational axis, the central passage being adapted to receive a tubular drive shaft;a pipe gripping assembly which underlies and is in axial alignment with the central passage; andmeans for rotating the pipe gripping assembly independent of the motor for orientation of the pipe gripping assembly, the body having an opening, a swivel sleeve being suspended in the opening of the body by a first engagement shoulder, a quill forming an extension of the drive shaft, the quill being suspended within the swivel sleeve by a second engagement shoulder, and a load nut being secured to the sleeve.5. The apparatus as defined in claim 4, wherein a thrust bearing is disposed between the first engagement shoulder of swivel sleeve and the second engagement shoulder of the quill to withstand axial loading upon the quill.6. The apparatus as defined in claim 4, wherein a bearing is disposed between the first engagement shoulder of the swivel sleeve and the main body, thereby facilitating rotation of the swivel sleeve relative to the main body.7. A top drive well drilling apparatus, comprising:a body having an opening, a swivel sleeve being suspended in the opening of the body by a first engagement shoulder with a load nut being secured to the sleeve;a hook receiver on the body, the hook receiver being adapted to be engaged with a hook carried by traveling blocks on a drilling rig;a motor secured to the body, the motor having a central passage defining a rotational axis, the central passage being adapted to receive a tubular drive shaft;a quill forming an extension of the drive shaft, the quill being suspended within the swivel sleeve by a second engagement shoulder;a thrust bearing disposed between the first engagement shoulder of swivel sleeve and the second engagement shoulder of the quill to withstand axial loading upon the quill;a pipe gripping assembly which underlies and is in axial alignment with the central passage, the pipe gripping assembly including pipe jaws and being telescopically adjustable to vary the positioning of the pipe jaws axially along the rotational axis in a selected telescopic position, the pipe gripping assembly having a ring gear;an auxiliary motor having a pinion gear which engages the ring gear on the pipe gripping assembly, thereby rotating the pipe gripping assembly independent of the motor for purposes of orientation of the pipe gripping assembly;a travel member adapted for mounting to a drilling rig, such that the travel member moves substantially vertically up and down the drilling rig;a torque restraint arm having a first and pivotally mounted to the travel member and a second end pivotally mounted to the body; anda first fluid actuated extendible cylinder acting to angularly adjust the torque restraint arm, thereby moving the body laterally so that the pipe gripping assembly can be moved into engagement with a pipe in a mouse hole of the drilling rig.8. The apparatus as defined in claim 7, wherein a bearing is disposed between the first engagement shoulder of the swivel sleeve and the main body, thereby facilitating rotation of the swivel sleeve relative to the main body.