Oil rings

Claim 1

A COMBINATION OIL RING HAVING A MAIN BODY PORTION AND A CIRCUMFERENTIALLY COMPRESSIBLE, PARTED EXPANDER; SAID BODY PORTION HAVING A PAIR OF PARTED CAST SECTIONS EACH FORMING A SIGNIFICANT PART OF THE BODY PORTION AND ADAPTED TO SEAT AGAINST EACH OTHER IN SIDE-TO-SIDE SECTIONS AND EACH HAVING A CYLINDER ENGAGINC CROWN ON ITS RADIALLY OUTER FACE AND AN AXIALLY EXTENDING CHANNEL IN ITS EXTERIOR SIDE ADJACENT ITS RADIALLY INNER FACE; SAID EXPANDER BEING OF USHAPED CROSS SECTION HAVING A WEB PORTION AND A PAIR OF LEGS WITH SAID LEGS EXTENDING RADIALLY OUTWARDLY; THE ENDS OF SAID LEGS HAVING OPPOSED FLANGES SEATING IN SAID CHANNELS, ONE IN THE CHANNEL OF EACH SECTION AND LOCKING SAID SECTIONS TOGETHER IN ALIGNMENT AND AGAINST SUBSEQUENT SEPARATION AXIALLY OF THE RING WHILE PERMITTING CIRCUMFERENTIAL MOVEMENT OF ONE SECTION WITH RELATION TO THE OTHER; SAID WEB PORTION BEING SPACED RADIALLY INWARDLY FROM THE RADIALLY INNER FACES OF SAID SECTIONS; SAID EXPANDER WHEN THE INNER FACES OF SAID SECTIONS; SAID EXPANDER WHEN OUTWARDLY ACTING PRESSURE ON SAID SECTIONS; SAID CHANNELS BEING WIDER THAN THE THICKNESS OF SAID FLANGES AND EACH OF SAID SECTIONS HAVING LIMITED FREEDOM OF RADIAL MOVEMENT INDEPENDENT OF THE OTHER OF SAID SECTIONS.