Abstract: A seal assembly for reception in a tapered counterbore which seal assembly includes a primary metal sealing ring with a seal band disposed on one end face thereof, and which further includes a frusto-conical or other tapered center portion and an opposite end portion which is contoured to receive and hold a secondary sealing ring, and a secondary sealing ring of annular configuration and having a generally central portion including, in its unstressed condition, a body with a cental body portion of generally circular cross section and including means lying outside the central body portion and adapted to engage the counterbore and/or the opposite end portion of the primary seal ring for positive location of the secondary seal ring during installation, with the counterbore or opposite end portion engaging means being positioned so as to move out of engagement with said tapered center portion and said counterbore respectively, so that said counterbore and tapered center portion, respectively, engage the round sur

Abstract: An elastomeric bearing assembly for supporting a rotor blade of a helicopter including a spherical elastomeric section mounted in serial relationship to a pair of frusto-conical elastomeric bearing section on the blade shaft. The frusto-conical bearing section includes two elastomeric bearings having bonded and alternate layers of elastomeric and non-extensible material and are arranged to receive the resulting force vectors in a direction normal to their planar surfaces.