Valve mechanism

Claim 1

A VALVE MECHANISM OF THE TYPE ADAPTED TO CONTROL THE ADMISSION OF MANIFOLD VACUUM TO AN ENGINE SPARK DISTRIBUTOR SERVO DEVICE IN WHICH SAID MECHANISM INCLUDES A VALVE CASING HAVING LONGITUDINALLY ALIGNED FIRST AND SECOND COUNTERBORED PORTIONS SEPARATED BY A WALL, A LONGITUDINAL OPENING FORMED IN THE CASING WALL AND INTERCONNECTING SAID PORTIONS, SEATS FORMED ON SAID CASING WALL AT EACH END OF SAID LONGITUDINAL OPENING, A PIN MEMBER LOOSELY DISPOSED IN SAID OPENING AND ADAPTED TO EXTEND LONGITUDINALLY THEREBEYOND, FIRST AND SECOND DISC VALVE MEMBERS RESPECTIVELY DISPOSED IN SAID FIRST AND SECOND COUNTERBORED PORTIONS, FIRST AND SECOND SPRING MEMBERS RESPECTIVELY URGING EACH OF SAID VALVE DISC MEMBERS AXIALLY INTO ENGAGEMENT WITH THE ENDS OF SAID PIN, A VACUUM INLET PORT FORMED IN SAID CASING MEANS AND COMMUNICATING WITH SAID FIRST COUNTERBORED PORTION, A VACUUM OUTLET PORT FORMED IN SAID CASING WALL AND COMMUNICATING WITH SAID LONGITUDINAL OPENING, THE SECOND COUNTERBORED CASING PORTION BEING OPEN TO THE ATMOSPHERE, SAID SECOND SPRING MEMBER BEING ADAPTED TO SEAT THE SECOND AND UNSEAT THE FIRST VALVE DISC MEMBERS AND THEREBY COMMUNICATE THE INLET AND OUTLET PORTS, AND A VACUUM RESPONSIVE DIAPHRAGM DEVICE ADAPTED TO OVERCOME THE SECOND SPRING MEMBER PERMITTING THE FIRST SPRING MEMBER TO SEAT THE FIRST AND UNSEAT THE SECOND DISC VALVE MEMBERS WHEREBY THE COMMUNICATION BETWEEN THE INLET AND OUTLET PORTS IS BLOCKED AND THE LATTER OPENED TO THE ATMOSPHERE.