Quick disconnect safety coupling

A quick disconnect safety coupling comprising:

• a first tubular coupling section;
• a second tubular coupling section;
• lever means detachably and pivotally connected to said first section and including a camming portion contacting said second section and camming said second section into sealing engagement with said first section;
• linkage means connected to said lever means and connected to said second section for movement thereon in a direction away from said first section, said linkage means comprising:
• axially slidable means mounted on said second tubular section for axial movement on said second tubular section away from said first tubular section;
• a flexible member connected to said axially slidable means for pulling said axially slidable means axially along said second section and away from said first section when said flexible member is tensioned;
• and
• link means extending from said axially slideable means in an axial direction relative to said first and second tubular sections, said link means comprising:
• a pull link pivotally connected to said axially slidable means;
• and
• a crank link pivotally connected by one of its ends to said pull link and at its other end to said lever means;
• a first valve subassembly in said first tubular coupling section and including a movable valve element effective for opening and closing said first tubular coupling section;
• and
• a second valve subassembly in said second tubular coupling section in contact with said first valve subassembly and including a movable valve element effective for opening and closing said second tubular coupling section whereby, when said sections are disengaged from each other, said first and second valve assemblies close each of said tubular coupling sections against fluid flow therethrough, and when said tubular coupling sections are cammed into sealing engagement with each other, said tubular coupling sections are opened to fluid flow through the coupled section in either direction of flow.

A quick disconnect safety coupling comprising:

• an open-ended female tubular section having radial openings through the wall thereof adjacent its open end;
• cam lever pins on the female section adjacent the openings;
• a tubular male section sealingly engageable with the female section and having a cam groove in the outer periphery thereof positioned for alignment with said openings when the male and female sections are engaged;
• valve means in said sections for closing each of said sections when the sections are disengaged from each other, and opening the sections to fluid flow through both sections when the sections are engaged;
• and
• a quick disconnect latching subassembly on the male section and releasably engaging the cam lever pins and cam grooves, said latching subassembly including:
• a ring around said male section and in splined interconnection thereto for axial movement on the male section;
• means on the ring for attaching a safety chain thereto;
• and
• link means extending from the ring to a location adjacent said cam lever pins, said link means comprising:
• a pull link pivotally connected to said ring;
• a crank link pivotally connected to said pull link;
• and
• a cam lever having a first end pivotally connected to the crank link and a second end releasably connected to one of said cam lever pins and engaging said cam groove.

A safety coupling comprising:

• an open-ended female tubular section having radial openings through the wall thereof adjacent its open end;
• cam lever pins on the female section adjacent the openings;
• a tubular male section sealingly engageable with the female section and having a cam groove in the outer periphery thereof positioned for alignment with said openings when the male and female sections are engaged;
• a first valve subassembly in said female section and including a moveable valve element effective for opening and closing said female section;
• a second valve subassembly in said male section in contact with said first valve subassembly and including a moveable valve element effective for opening and closing said male section;
• and
• a quick disconnect latching subassembly on the male section and releasably engaging the cam lever pins and cam groove, said latching subassembly including:
• a ring around said male section and in splined interconnection thereto for axial movement on the male section;
• means on the ring for attaching a safety chain thereto;
• and
• link means extending from the ring to a location adjacent said cam lever pins.