SINCE 1828
Oldham's coupling
noun
Old·ham's coupling
| \ ˈōldəmz-\
Definition of Oldham's coupling
: a coupling for parallel shafts slightly out of line consisting of a disk on the end of each shaft and an intermediate disk having two mutually perpendicular feathers on opposite sides that engage slots in the respective shaft disks
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Merriam-Webster unabridged
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