Cylinder construction

Claim 1

A PISTON AND CYLINDER FOR DIVIDING A CYLINDER INTO SEPARATE PRESSURE SPACES INCLUDING PLURAL, ADJOINING, CYLINDRICAL SECTIONS DEFINING A MULTI-SECTION CYLINDER BARREL, MEANS DEFINING THE CLOSED ENDS OF SAID CYLINDER, A PISTON POSITIONED WITHIN SAID BARREL, PORTS FOR ADMITTING AND EXHAUSTING FLUID FROM AXIALLY SPACED PORTIONS OF SAID SECTIONS, SAID ADJOINING SECTIONS HAVING INTERFITTING CONFRONTING PORTIONS DEFINING A CIRCUMFERENTIALLY EXTENDING GROOVE OPENING INTO SAID CYLINDER, SAID GROOVE HAVING AN OUTER WALL AND SIDE WALLS EXTENDING GENERALLY RADIALLY OF THE CYLINDER, A SEAL RING POSITIONED IN SAID GROOVE AND HAVING AN OUTER SURFACE ENGAGEABLE WITH SAID OUTER WALL OF SAID GROOVE, SAID SEAL RING HAVING PLURAL SPACED LOBES PROJECTING INWARDLY BEYOND THE INNERMOST PORTIONS OF THE CYLINDER WALL OF SAID SECTIONS AND IN SEALING ENGAGEMENT WITH SAID PISTON, SAID RING HAVING RECESSES IN THE SIDES THEREOF, THE SIDE WALLS OF SAID SECTIONS DEFINING SAID GROOVES INCLUDING PORTIONS FITTING SAID RECESSES TO THEREBY CAPTIVATE SAID RING, SAID SEAL RING SERVING TO DIVIDE THE SPACE WITHIN SAID CYLINDER INTO SEPARATE PRESSURE SPACES ON OPPOSITE SIDES OF SAID RING WHILE SERVING TO SEAL THE JOINT BETWEEN SAID SECTIONS.