Patent ID: 8291791
Filing Date: 2012-10-23
Classification: E21B

Abstract:
1. An open-faced rod-spinning device for making and breaking joints of a drill rod comprising: a carriage assembly including an open face; a drive gear including an open face, said drive gear being rotatably coupled to said carriage assembly; drive pins coupled to said drive gear; and first, second, and third gripping lobes pivotally connected to said carriage assembly, each of said first, second, and third gripping lobes having first and second gripping surfaces, an end opposite said first and second gripping surfaces, and a waist between said end and said first and second gripping surfaces, wherein: wherein upon rotation of said drive gear in a first direction, drive pins engage a first side of said waist of each of said first, second, and third gripping lobes to pivot said first, second, and third gripping lobes relative to said carriage assembly causing said first gripping surface of each of said first, second, and third one gripping lobe to contact the drill rod; wherein upon rotation of said drive gear in a second direction, drive pins engage a second side of said waist of each of said first, second, and third gripping lobes to pivot said first, second, and third gripping lobes relative to said carriage assembly causing said second gripping surface of each of said first, second, and third gripping lobes to contact the drill rod.