New type of CV Joint
For those 'bent' on power transmission ... 
Thompson Couplings Ltd - Home
Originally Posted by "About the Thompson Coupling" page
The Thompson Coupling is the world's first and only Constant Velocity Joint which:
Has all loads carried by roller bearings
Has no sliding or skidding surfaces whatsoever
Can tolerate axial and radial loads without degradation
Has no torque limitation, constructed to any torque level
Does not require special lubrication
Does not require a dust boot
No wearing components except replaceable bearings and trunnions
Is suitable for automotive tail or propeller shaft applications
Is a true Constant Velocity Coupling as distinct from a cv joint
Is less bulky than a double coupling or double Cardan joint.