Patent ID: 8608210

Claim:
A coupling device for use with a tubular member having a generally cylindrical outer wall, said coupling device comprising: a coupling body having an axially extending first engagement portion and an axial opening including an outer end adapted to receive said tubular member, said opening having a counterbore including an initial generally cylindrical portion forming a body bearing and locking member adjacent the outer end of the opening and extending to a generally frusto-conical camming surface tapering radially inward remote of said outer end; a first generally annular ferrule having a tapered external surface portion engageable with said coupling body camming surface and a tapered internal surface portion; a second generally annular ferrule including in an axial direction a forward region having a tapered external surface portion and a tubular portion, a central region having a first stepped portion and a rearward region having a second stepped portion, said tapered external surface portion of said second ferrule engaging said tapered internal surface portion of said first ferrule; a collar having an axially extending second engagement portion for selectively engaging said first engagement portion of said coupling body and in a fully engaged position to provide a fluid tight seal between said coupling device and said tubular member, said collar also having a bore extending axially therethrough for receiving said tubular member, said bore having a reduced diameter bore portion including an internal surface for bearing engagement with said second stepped portion and an end wall for axially biasing said second ferrule toward said first ferrule; said coupling body, collar and ferrules being sized so that upon engagement said tapered external surface portion of said second ferrule engages said tapered internal surface portion of the first ferrule, said tapered external surface portion of the first ferrule engages said camming surface of said coupling body, said first and second stepped portions of the second ferrule are respectively maintained in bearing engagement with the body bearing and locking member of the coupling body and said internal surface of said reduced diameter bore portion, the body bearing and locking member being biased into a recess of said reduced diameter bore portion, and said tubular portion of said second ferrule axially collapses within said forward region as said coupling body and collar are fully engaged in a fluid tight seal with said tubular member.