B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
153/16
B21D 19/00 (2006.01) B21D 41/00 (2006.01)
Patent
CA 1191436
SWAGING APPARATUS FOR RADIALLY EXPANDING TUBES TO FORM JOINTS ABSTRACT OF THE DISCLOSURE A swaging apparatus for expanding a tube radially to form a joint, the apparatus including a mandrel for insertion in the tube. A working fluid is supplied through the mandrel to apply hydraulic pressure to the tube. The mandrel carries a pair of oppositely direct- ed ramps, and a pair of seal combinations that are movable axially along the ramps. The seal combinations define the ends of an annular volume within which the pressurized fluid flows between the mandrel and the tube, each seal combination including a softer primary seal, which may be an O-ring, and a harder backup seal. Positioning sleeves that are axially slidable on the mandrel prevent angular movement of the backup seals relative to the longitudinal axis of the mandrel, thereby maintaining a uniform circumferential extrusion gap between the mandrel and the tube when pressure is applied. When the mandrel is being inserted, the seals are disposed at the smaller ends of the ramps so as to minimize frictional resistance to the insertion, the outer primary seal being resiliently urged inwardly by the corresponding positioning sleeve. The seals are returned to the large ends of the ramps by the applica- tion of the hydraulic pressure.
414130
Gowling Lafleur Henderson Llp
Haskell Inc.
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