US Patent 7703356 Tool assembly, system and method, for driving threaded members

A system and tool assembly for driving threaded members includes, a set of interlocking torque transfer modules for transferring a torque between a driver coupled with a first one of the modules and a threaded member coupled with a second one of the modules. At least one of the modules has a body and a torque transmitting geartrain housed within the body, the geartrain includes an input gear rotatable about a first axis and an output gear rotatable about a second, different axis. The input gear includes a first connecting interface configured to receive an input torque from a driver, and the output gear has a second connecting interface configured to output an output torque to a threaded member, such as a bolt or sparkplug.