Patent ID: 6962489

Claim:
A pumping device comprising a pump with progressive cavities or Moineau pump with a helical rotor inside a helical cavity of a stator, drive means with a driving shaft roughly coaxial with the cavity of the stator, and a drive connecting rod which is inserted between the driving shaft of the drive means and one end of the rotor to both of which it is coupled by respective coupling means arranged so that said connecting rod follows rotation of the rotor about its own axis, and rotation of the axis of the rotor about the axis of the cavity of the stator, wherein each of said coupling means comprises a spherical head secured to the connecting rod at the rotor end or the driving shaft end, respectively, a cavity that is cylindrical of revolution with the same diameter as said spherical head so as to accommodate the latter and secured coaxially to the rotor end or the driving shaft end of the connecting rod, respectively, and a ball housed, in part, in a cup in the shape of a spherical cap of a complementary shape made in the spherical head which is arranged in such a way that its axis is roughly perpendicular to the axis of the connecting rod at the rotor or at the driving shaft end respectively and, in part, in a lateral recess of complementary dimensions made in the cavity that is cylindrical of revolution, whereby the ball forms an offset rotary articulation of said spherical head about a center of said ball compatible with the movement of the double rotation inherent to the Moineau pump and allowed the connecting rod to be inclined appreciably with respect to the end of the rotor or of the driving shaft, respectively, as the driving shaft that drives the rotor rotates.