Expansion mounting

Claim 1

IN AN EXPANSION MOUNTING ASSENBLY FOR SUPPORTING A ROTATABLE MEMBER, A SUBSTANTIALLY ENCLOSED MAIN HOUSING CONSISTING OF A LOWER SECTION HAVING AN ELONGATED FLAT BASE AND A PAIR OF SPACED APART UPWARDLY DIVERGING WINGS, A TOP SECTION OF GENERALLY SEMI-CYLINDRICAL SHAPE SECURED TO THE LOWER SECTION, A COVER PLATED DETACHBLY SECURED TO ONE SIDE OF THE OPEN END OF THE MAIN HOUSING, AND AN ANNULAR WALL SECURED TO THE OPPOSITE OPEN END OF THE MAIN HOUSING DEFINING AN OPENING FOR RECEIVING THE ROTATABLE MEMBER, A SEALING ELEMENT CARRIED BY SAID ANNULAR WALL ADAPTED TO ENGAGE THE ROTATRABLE MEMBER THEREBY PROVIDING AN ASSEMBLY WHEREIN ALL OF THE INERNAL PARTS INCLUDING THE BEARING MEMBERS ARE SEALED FROM THE SURROUNDING ATMOSPHERE BY A SINGLE SEAL, A HOUSING CARTRIDGE MOUNTED IN THE MAIN HOUSING, BEARING MEANS SUPPORTING THE ROTATABLE MEMBER IN THE HOUSING CARTRIDGE, A LADDER BEARING ASSEMBLY COMPRISING A PLURALITY OF ROLLERS DISPOSED BETWEEN THE HOUSING CARTRIDGE AND THE BASE OF THE MAIN HOUSING TO PERMIT AXIAL MOVEMENT OF THE HOUSING CARTRIDGE RELATIVE TO THE MAIN HOUSING, THE ROLLING AXES OF THE ROLLERS OF THE LADDER BEARING ASSEMBLY DISPOSED IN A PLANE TRANVERSE TO THE VERTICAL AXIS OF THE EXPANSION MOUNTING ASSEMBLY AND MOUNTED FOR ROLLING MOVEMENT IN A TRULY AXIAL DIRECTION, MEANS DEFINING SLOTTED OPENINGS IN THE UPPER EDGE OF EACH OF THE WINGS OF THE LOWER SECTION OF THE MAIN HOUSING DEFINING DIAMETRICALLY OPPOSED POCKETS AT THE JUNCTURE OF THE TOP SECTION AND LOWER SECTION OF THE MAIN HOUSING, DIAMETRICALLY OPPOSED LATERAL PROJECTIONS HAVING AXIALLY EXTENDING BEARING SURFACES ON THE HOUSING CARTRIDGE, A PLURALITY OF ROLLER ELEMENTS IN SAID POCKETS AT DIAMETRICALLY OPPOSED POINTS BETWEEN THE MAIN HOUSING AND THE HOUSING CARTRIDGE AT OPPOSITE SIDES OF THE MAIN HOUSING ADAPTED TO ENGAGE SAID LATERAL PROJECTIONS TO ABSORB LATERAL SHOCK LOADINGS, THE AXES OF SAID ROLLER ELEMENTS IN SAID POCKETS EXTENDING PARALLEL TO A PLANE THROUGH THE VERTICAL AXIS OF THE EXPANSION MOUNTING ASSEMBLY.