A ratcheting CVT employs a series of 1-way clutches or ratchets that rectify and sum only "ahead" motion. The on-off characteristics of a normal ratchet implies that many of those designs are usually not constant in operation (i.e. technically not a CVT), but in exercise, there are lots of similarities https://gearboxcvt70244.theisblog.com/32887392/an-unbiased-view-of-gearbox-cvt