Patent ID: 8460114

Claim:
A rotary elastic coupling comprising: an inner ring including a plurality of radially outward protrusions; an outer ring surrounding said inner ring around a periphery of said inner ring and including a plurality of radially inward protrusions, said radially outward protrusions of said inner ring undercutting said radially inward protrusions to form a meander-shaped annular slit around a periphery of the coupling; and an elastomer included in said annular slit, said elastomer being one of vulcanized and glued to said inner ring and said outer ring and filling up said annular slit one of substantially and completely, said elastomer including a relief opening around said periphery of the coupling on both sides of said radially outward protrusions of said inner ring, said relief opening positioned one of radially outside said radially outward protrusions and on an outer radius of said radially outward protrusions, an additional relief opening located around said periphery of said coupling on both sides of said radially inward protrusions of said outer ring, said additional relief opening including a first said additional relief opening positioned on one of said sides of a respective one of said radially inward protrusions and a second said additional relief opening positioned on another of said sides of said respective one of said radially inward protrusions, said additional relief opening being positioned one of radially inside of a radially inner-most radius of said radially inward protrusions and on said radially inner-most radius of said radially inward protrusions.