Rotary actuator

Claim 1

IN A ROTARY ACTUATOR, A HOUSING HAVING AN ANNULAR ACTUATOR CHAMBER THEREIN HAVING RECTANGULAR WALLS, A SHAFT ROTATABLY JOURNALLED WITHIN SAID HOUSING IN INWARDLY SPACED RELATION WITH RESPECT TO SAID ACTUATOR CHAMBER, SAID HOUSING HAVING A CONTINUOUS SLOT THEREIN OPENING FROM SAID SHAFT TO SAID CHAMBER, A DISK ON SAID SHAFT EXTENDING THROUGH SAID SLOT AND INTO SAID CHAMBER, A PAIR OF ALIGNED STATIONARY ABUTMENTS MOUNTED WITHIN SAID CHAMBER ON OPPOSITE SIDES OF SAID DISK, SEALING MEANS SEALING SAID ABUTMENTS TO SAID CHAMBER AND DISK, A PAIR OF ALIGNED WINGS EXTENDING FROM OPPOSITE SIDES OF SAID DISK AND SECURED THERETO, MEANS SEALING SAID WINGS TO SAID CHAMBER, SAID WINGS WITH SAID ABUTMENTS DIVIDING SAID CHAMBER INTO TWO PAIRS OF WORKING CHAMBERS OF INCREASING AND DECREASING VOLUME, SAID DISK HAVING A REDUCED CROSS-SECTIONAL AREA PORTION WITHIN SAID SLOT AND HAVING INTERNAL CYLINDRICAL FACES IN GENERAL ALIGNMENT WITH THE INNER MARGIN OF SAID CHAMBER, AND DOUBLE FACED SEALING MEANS IN SAID REDUCED CROSS-SECTIONAL AREA PORTION FOR SEALING SAID DISK TO SAID SLOT COMPRISING A SEALING RING ON OPPOSITE SIDES OF SAID DISK AND HAVING RIGHT ANGLED SEALING FACES, ONE OF SAID SEALING FACES HAVING SEALING ENGAGEMENT WITH SAID INTERNAL CYLINDRICAL WALL OF SAID DISK AND THE OTHER OF SAID SEALING FACES HAVING SEALING ENGAGEMENT WITH THE WALL OF SAID SLOT, A RETAINER FOR EACH SEALING RING, AND MEANS PRESSURIZING SAID RETAINERS TO MAINTAIN SAID SEALING RINGS IN SEALING ENGAGEMENT WITH SAID SLOT AND DISK.