the ring being metallic

Full Title

Yielding couplings, i.e. with means permitting movement between the connected parts during the drive (couplings disconnectable simply by axial movement F16D1/10; slip couplings F16D7/00) > with the coupling parts connected by one or more intermediate members (F16D3/16 takes precedence) > shaped as an elastic ring centered on the axis, surrounding a portion of one coupling part and surrounded by a sleeve of the other coupling part > the ring being metallic