Patent ID: 7900976
Filing Date: 2011-03-08
Classification: B21D,B25B,F16L,Y10T

Abstract:
1. A coupling device for use with a tubular member having a generally cylindrical outer wall, said coupling device comprising: a coupling body having an axial opening including an outer end adapted to receive said tubular member, said opening having a counterbore including an initial generally cylindrical portion adjacent the outer end of the opening that extends to a generally frusto-conical camming surface tapering radially inward, said coupling body having an outer profile including a first mechanical engagement section extending therealong; a first generally annular ferrule having a tapered external surface portion cooperatively engageable with said coupling body camming surface and a tapered internal surface portion; a second generally annular ferrule having an axial extent including a forward region including a tapered external surface portion and a first stepped portion, a central region having a tubular portion and a rearward region having a second stepped portion, said tapered external surface of said second ferrule being arranged for cooperative engagement with said tapered internal surface portion of said first ferrule and said first stepped portion being arranged for bearing engagement with said generally cylindrical portion of said counterbore of said coupling body; a collar having a second mechanical engagement section adapted to selectively engage said first engagement section of said coupling body, said collar having a bore extending axially therethrough for closely receiving said tubular member, and a collar counterbore for receiving said second stepped portion of said second ferrule, said counterbore bore having 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 swaging engagement said tapered external surface of said second ferrule engages said tapered internal surface of the first ferrule, said tapered external surface 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 generally cylindrical portion of the coupling body counterbore and said internal surface of said collar counterbore, and said tubular portion of said second ferrule axially collapses within said central region as said coupling body and collar are permanently fixed together in a fluid tight seal with said tubular member.