Secrets of the face

A rotary regenerator of the drum matrix type includes main seals engaging the matrix where it passes through the bulkhead of the regenerator. Each main seal includes a frame closely encircling the matrix with particular means for connecting the main seal to the bulkhead. The frames include side shoes biased by springs against the outer or end faces of the matrix rims. Also, the seal assemblies include bumper stops backed up by bridled springs which allow controlled yielding of the stops if the matrix shifts laterally because of shocks from the vehicle in which the regenerator is mounted. This disclosure incorporated by reference to the parent application, now U.S. Pat. No. 3,638,716.