Patent ID: 6203435
Filing Date: 2001-03-20
Classification: E21B,F16D

Abstract:
A down hole drilling motor drive shaft flexible coupler for inclusion in a continuing motor drive shaft, the coupler comprising:a) a first terminal with means for attachment to a continuing motor drive shaft and a first spherical surface with a plurality of peripheral slots extending some distance thereabout in a generally axial direction;b) a second terminal with means for attachment to a continuing motor drive shaft;c) a load carrier with a second spherical surface to mate with said first spherical surface and a generally cylindrical extension, with an axis, secured to said second terminal, said second spherical surface provided with at least two diametrically opposed cross bores each with axes that lie along a radial line of the sphere comprising said second spherical surface; andd) a rocker cam situated in each said cross bore, each with a head extending into one of said slots, each situated to rotate a limited amount in said bore, said heads situated to slide axially a limited amount along said slots.