Patent ID: 6263764
Filing Date: 2001-07-24
Classification: B23P,B25B,F16B,Y10S,Y10T

Abstract:
A multi jackbolt tensioner including:a jackbolt body having a plurality of holes spaced uniformly from a longitudinal central axis at spaced apart locations about an outer periphery thereof, said holes having sidewalls formed with body threads; andjackbolts each including a torque receiving end adjacent a jackbolt body having jackbolt threads to threadedly engage said body threads in one of the holes in said jackbolt body, said jackbolt threads and said body threads being constructed to form a helical gap commencing at a place of metal to metal threaded contact proximate said torque receiving end and terminating remotely thereto along the length of the jackbolt, said helical gap being defined by an ever increasing transverse volume to elastically produce metal to metal thread contact in a load transferring relation along the length of the threads with ever increasing thread stress in response to torque applied to the torque receiving end of the jackbolt.