Friction driven steplessly variable speed gearing

Claim 1

FRICTION DRIVEN STEPLESSLY VARIABLE SPEED GEARING INCLUDING AT LEAST TWO FRICTION DISCS SECURED IN FIXED SPACED RELATION ON A FIRST SHIFT, A SECOND SHAFT INCLINED RELATIVELY TO THE SAID FIRST SHAFT AND CARRYING AT LEAST ONE FRICTION DISC LOCATED BETWEEN SAID SPACED DISCS IN OVERLAPPING AND INCLINED RELATION THERETO AFFORDING V FORMATIONS BETWEEN THE RELATIVELY INCLINED DISCS, AND A ROTATABLE MOTION TRANSMITTING MEMBER DISPOSED IN EACH OF SAID V FORMATION, IN WHICH THE FACES OF THE FRICTION DISCS ARE SO FORMED THAT IN CHANGING THE GEAR RATIO OF THE CENTRES OF THE MOTION TRANSMITTING MEMBERS ENGAGING OPPOSITE FACES OF A DISC LOCATED BETWEEN THE RIGIDLY SPACED DISCS ARE EACH MOVED IN A PLANE WHICH IS NORMAL TO A LINE DIVIDING THE ANGLE BETWEEN THE RELATIVELY INCLINED SHAFTS AND SAID CENTRES ARE ALSO MOVED IN THE SAID PLANE ALONG A LINE WHICH INTERSECTS THE CENTRES OF THE SAID SHAFTS, AND INCLUDING MEANS FOR MAINTAINING THE MEMBERS DURING THEIR TRAVERSE MOTION IN A NEUTRAL POSITION SUCH THAT THEY HAVE NO INHERENT TENDENCY TO MOVE EITHER TO INCREASE OR TO DECREASE THE GEAR RATIO.