Bi-directional, no-back transmissions

Claim 1

A BI-DIRECTIONAL TRANSMISSION COMPRISING A PAIR OF COAXIAL, RADIALLY SPACED, RELATIVELY ROTATABLE MEMBERS, A PAIR OF OPPOSING WEDGING ASSEMBLIES POSITIONED BETWEEN SAID MEMBERS, EACH OF SAID WEDGING ASSEMBLIES COMPRISING A PAIR OF ELEMENTS OF SUBSTANTIALLY THE SAME SHAPE AND EACH HAVING A FLAT FACE AND AN OPPOSITE CONVEX FACE, THE ELEMENTS BEING ASSEMBLED WITH THEIR FLAT FACES IN ENGAGEMENT WITH EACH OTHER AND WITH THEIR CONVEX FACES IN RESPECTIVE ENGAGEMENT WITH SAID MEMBERS, THE ELEMENTS BEING DIMENSIONED SO THAT THEIR ASSEMBLED HEIGHT WOULD BE GREATER THAN THE SPACING BETWEEN SAID MEMBERS IF THE ELEMENTS WERE RELATED SO THAT THEIR AREAS OF MAXIMUM HEIGHT WERE IN ALIGNMENT WITH ONE ANOTHER, SAID ELEMENTS BEING ASSEMBLED WITH THEIR AREAS OF MAXIMUM HEIGHT OFFSET FROM ONE ANOTHER, THE ANGLE OF THE PLANE OF ENGAGEMENT OF THE FLAT FACES OF ONE ASSEMBLY BEING OPPOSITE TO THE ANGLE OF THE PLANE OF ENGAGEMENT OF THE FLAT FACES OF THE OTHER ASSEMBLY, CONTROL MEANS POSITIONED BETWEEN SAID MEMBERS AND INTERMEDIATE SAID WEDGING ASSEMBLIES FOR COACTION WITH AN ELEMENT OF EACH OF THE ASSEMBLIES, AND RESILIENT MEANS COACTING WITH ONE OF THE ELEMENTS OF EACH OF SAID WEDGING ASSEMBLIES TO URGE THE ELEMENTS TOGETHER AND AGAINST SAID MEMBERS.