CHUCK FOR CLAMPING TUBES Russian patent published in 2003 - IPC

FIELD: machine engineering, possibly clamping oil-production tubes at their working by cutting. SUBSTANCE: chuck for clamping tubes includes clamping cams arranged in casing and having curvilinear working surface, pinion shafts and gear wheel. Pinion shafts are engaged with gear wheel having internal teeth. Clamping cams are stationary mounted in pairs on pinion shafts. Working surfaces of clamping cams are in the form of Archimedian spiral. It simplifies design of chuck, provides self-wedging of cams and self-centering of tubes. EFFECT: possibility for clamping tubes in wide range of their diameters, enhanced reliability and efficiency of working. 2 dwg