Variable ratio transmission

Claim 1

A TRANSMISSION UNIT OF THE TYPE HAVING COAXIAL DRIVING AND DRIVEN DISCS MOUNTED FOR ROTATION ABOUT A MAIN AXIS COMMON TO BOTH DISCS AND AT LEAST ONE ROLLER PROVIDING A DRIVING CONNECTION BETWEEN FACING TORODIAL SURFACES OF THE DISCS, A MOUNTING FOR THE ROLER PROVIDING A HUB UPON WHICH THE ROLLER MAY ROTATE ABOUT AN AXIS EXTENDING IN A GENERALLY RADIAL DIRECTION FROM, AND NORMALLY INTERSECTING THE MAIN AXIS WITH FREEDOM FOR THE ROLER ROTATIONAL AXIS TO VARY IS INCLINATION IN RELATION TO THE MAIN AXIS FOR VARIATION OF THE TRANSMISSION RATION BETWEEN THE DRIVING AND THE DRIVEN DISC THE ROLLER MOUNTING COMPRISING MEANS FOR RESTRAINING THE ROLLER FROM ROTATION ABOUT AN AXIS INTERSECTING ITS POINTS OF CONTACT WITH THE DISCS BUT PERMITTING BODILY DISPLACEMENT OF THE ROLER TRANSVERSELY WITH RESPECT TO THE MAIN AXIS IN A DIRECTION NORMAL TO THE ROTATIONAL AXIS OF THE ROLLER AND THE LINE JOINING THE POINTS OF CONTACT BETWEEN THE ROLLER AND THE DISC (SUCH BODILY DISPLACEMENT BEING HEREINAFTER REFERRED TO AS "TANGENTIAL SHIFT") MEANS ASSOCIATED WITH THE ROLLER SUPPORT MEANS FOR POSITIONING THE ROLLER AND CONTROLLING MOTIONS OF THE ROLLER IN THE TANGENTIAL SHIFT DIRECTION, WHICH MEANS PASS INTO A HOLLOW SPACE WITHIN THE SAID HUB WITHOUT OCCYPYING SPACE BEYOND THE OUTER EDGE OF THE ROLLER WHICH FORMS THE RUNNING TRACK OF THE ROLLER UPON THE DISCS.