Seals between rotating parts

Claim 1

A COMBINATION OF RELATIVELY ROTATABLE FIRST AND SECOND PARTS, RELATIVELY ROTATABLE FIRST AND SECOND SEALING ELEMENTS WITH COOPERATING PRIMARY SEALING FACES WHICH ARE SEPARABLE BY RELATIVE AXIAL MOVEMENT OF THE SEALING ELEMENTS, MEANS LOCATING THE ELEMENTS RELATIVELY TO THE PARTS WITH A LIMITED RANGE OF FREE AXIAL MOVEMENT OF BOTH ELEMENTS AND WITH EACH ELEMENT RESTRAINED FROM ROTATION RELATIVE TO A RESPECTIVE ONE OF THE PARTS, SECONDARY SEALING MEANS, EACH INCLUDING A SECONDARY SEAL AND A COOPERATING SECONDARY SEALING SURFACE, ACTING BETWEEN EACH SEALING ELEMENT AND ITS RESPECTIVE PART, THE SECONDARY SURFACES BEING OF THE SAME RADIUS, AND LOW-RATE SPRINGS ACTING AXIALLY BETWEEN EACH SEALING ELEMENT AND ITS RESPECTIVE PART FOR USING THE PRIMARY SEALING FACES INTO CONTACT WITH ONE ANOTHER, WHILE PERMITTING EASY SIMULTANEOUS AXIAL DISPLACEMENT OF THE SEALING ELEMENTS RELATIVELY TO THE PARTS WHEN THE PARTS ARE SUBJECTED TO AXIAL SHOCK, SAID TWO PARTS BEING AN INNER AND AN OUTER SLEEVE AND EACH SLEEVE HAVING A RADIAL FLANGE PROJECTING TOWARDS THE OTHER SLEEVE, WHICH FLANGES ARE AXIALLY SPACED SO AS TO FORM A SUBSTANTIALLY CLOSED CAVITY BETWEEN THEM, AND MEANS FOR RETAINING THE SEALING ELEMENTS IN THE CAVITY, AND MEANS FOR PREVENTING AXIAL SEPARATION OF THE SLEEVES.