US Patent 11753775 Rail threader workhead

A rail threader workhead is disclosed for attachment to an end of a rail machine boom and configured for placing a railroad rail upon a section of railroad ties. The rail threader workhead includes a first apparatus for mounting to the end of the rail machine boom and operable to pivot in a vertical pitch direction, a second apparatus extending from the first apparatus and operable to pivot in a horizontal yaw direction, and a third apparatus extending from the second apparatus. The third apparatus includes a pair of roller assemblies configured to engage the railroad rail, the third apparatus configured to pivot in a cant or roll direction.