ABSTRACTDisclosed is a coupling for joining two elements withtheir central axes aligned so that turning one element aroundits central axis will turn the other element. The couplingcomprises a raised portion on an end of one element and a matingrecessed portion on an end of the other of the elements adaptedto engage with the raised portion. The raised portion com-prises a substantially circular disc-shaped base portion, anuneven number of portions integrally formed with and protuberantabove the base portion and concentrically located withinone surface thereof and a similar number of ribs integrally formedwith the base portion and alternating with the protuberantportions and extending outwardly thereof. Each rib memberextends substantially from a radius of the base portion to theouter periphery thereof in a substantially symmetrical configur-ation with the remaining ribs. The recessed portion of theother of the elements comprises a recessed, substantially cir-cular recess portion of similar diameter to the base portion,an inwardly projecting protuberant recess substantially con-centric with the circular recess and of similar dimensions to theprotuberant portions of the raised portion of the one element,and a plurality of flutes projecting inwardly of the protuberantrecess and positioned for mating engagement with the pluralityof ribs on the raised portion of the one element.
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