Patent ID: 8371949

Claim:
A coupling comprising; a) an input shaft having a first wave surface thereupon; b) wherein the first wave surface comprises mounds and valleys; c) an output shaft having a second wave surface thereupon; d) wherein the second wave surface comprises mounds and valleys; e) a housing substantially enclosing the first wave surface and second wave surface; f) a wave ring comprising a first wave ring surface and a second wave ring surface on alternate lateral sides of the wave ring; g) each wave ring surface comprising a plurality of mounds and valleys; h) wherein the first wave ring surface is in geared contact with and transmits rotional force from the first wave surface of the input shaft to the wave ring without an appreciable variation of transmitted speed; i) wherein the second wave ring surface is in geared contact with the second wave surface of the output shaft and transmits rotational force from the wave ring to the second wave surface of the output shaft; and j) wherein the first wave surface of the input shaft and second wave surface of the output shaft transmit rotational force therebetween via the wave ring through a range of output angles, up to a maximum output angle, between a rotational axis of the input shaft relative to a rotational axis of the output shaft.