Granted September 29, 1959, in which one of the strain gear or ring gear constitutes the input. The parent application is incorporated herein by reference. The reader is referred to this patent for a general description of the subject matter of the invention and a basic understanding of its principles. 


The species of the parent application relating to the dual form and to the electromagnetic straininducer is embodied in my copending application Serial No. 656,572, filed May 2, 1957, for Dual Strain Wave Gearing.

A purpose of the invention is to secure relative motion between cooperating internal and external gears, by propagating a strain wave which advances an area of contact or preferably a plurality of areas of contact between the respective gears...read more

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