Quick disconnect coupler and safety check valve

In a compressed air system in-line quick disconnect female coupler adapted to receive an associated cylindrical male plug having a truncated cone cross-sectional shaped annular ring formed thereon and an annular groove formed therein, said annular ring defining in part said annular groove an improvement comprising cylindrical body means having at least one each angled first passageway through the cylindrical wall thereof;

• retractable sleeve means exteriorly coaxial said cylindrical body means, said sleeve means defining a first interior annular groove means juxtaposed said first passageway in said cylindrical body means, annular split ring means nesting in said first annular groove means, compression spring means interior said sleeve means juxtaposed said annular split ring means and said cylindrical body means outside surface, and second interior annular groove means adjacent said first interior annular groove means;
• holding ball means residing in said cylindrical body means first passageway communicating with both said cylindrical body means interior and exterior;
• and full flow valve means interiorly said cylindrical body means whereby when inserting said associated male plug means into said female coupler, said holding ball means is engaged by the associated male plug means annular ring, said holding ball rises in said first passageway, engages said sleeve means split ring means and wall of said second interior annular groove means, and retracts said sleeve means thereby permitting continued movement of said holding ball means in order to ride up said associated male plug annular ring into said sleeve means second interior annular groove which has moved over said cylindrical body first passageway, over said associated male plug annular ring and down into said associated male plug annular groove means, said spring means then urging said sleeve means to its initial position and the associated male plug is held in place by coaction of said holding ball means, said associated male plug annular groove means, and said sleeve means, and said cylindrical body means thereby engaging said full flow valve means permits air to flow through said coupler.