Patent ID: 7584810

Claim:
A top drive power swivel assembly for well drilling rigs, comprising: a. a travelling frame for moving along at least two tubulars, wherein the at least two tubulars are part of a drilling tower, and wherein the travelling frame comprises: at least a first and second lower travelling frame extension and at least a first and second upper travelling frame extension; b. a housing for holding a top drive power swivel, wherein the housing comprises at least a first and a second upper housing extension and at least a first and second lower housing extension; c. a plurality of openings disposed in each of the extensions; d. at least one upper connector for penetrating at least one opening in the at least one upper travelling frame extension and at least one opening in the at least one upper housing extension to securely engage the travelling frame to the housing and at least one lower connector for penetrating at least one opening in at least one lower travelling frame extension and at least one opening in at least one lower housing extension to securely engage the travelling frame to the housing; e. a top drive power swivel mounted to the housing, wherein the top drive power swivel comprises a rotating drive shaft rotatable on an axis parallel to a hoisting axis, wherein the power swivel receives power from at least two hydraulic motors; f. a plurality of sheave assemblies mounted to the travelling frame wherein each sheave assembly engages a hoisting means; and g. at least two guide wheel assemblies disposed on opposite sides of the travelling frame, wherein each guide wheel assembly engages one of the at least two tubulars.