| 摘要 |
A coupler for coupling shafts has an inside coupling having an outer periphery and a center opening with a longitudinal axis which is adapted to receive the end of a driving shaft. An outside coupling has a center opening with an inner periphery, and is rotatably fitted over the outer periphery of the inside coupling. A plurality of arcuate notches are located in the outer periphery of the inner coupling and the inner periphery of the outer coupling and are adapted to register with each other in mating relationship wherein the mating notches present collectively a circular roller surface. A plurality of cylindrical rollers are rotatably mounted in the notches of the inside and outside coupling and serve to operatively join the inside and outside coupling for rotation together. The notches in the inside coupling have an arcuate portion capable of receiving the rollers in a nesting position without the rollers penetrating the notches in the outside coupling. Further, the shape of the notches in the inside coupling are also of a shape that if the inside and outside couplings are rotating in one direction in operative engagement to the rollers, and the inside coupling has its rotational motion retarded, the rollers will return to the nesting position within the notches of the inside roller to disengage the operative engagement between the couplings.
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