| 摘要 |
A flareless tube coupling having screwed together body and nut members provided with oppositely tapered cam surfaces operative upon screwing together of the body and nut members to contract a tapered C-shaped grip ring within the nut cam surface into gripping engagement with a tube therewithin and to urge the axially inner end of a thin tubular sleeve into sealed engagement with the body cam surface and into gripping and sealing engagement with the tube, the large end of the grip ring having a plane end surface in engagement with the plane end surface of a radially enlarged collar at the axially outer end of the sleeve. In addition, the nut member has a shoulder at the large end of its cam surface which engages the radially outer portion of the plane end surface of the collar to limit contraction of the grip ring and to positively restrain the sleeve from axial outward movement with respect to the body member under the influence of fluid pressure in the coupling assembly or upon imposition of tensile pulling apart forces exerted on the tube and body member. The coupling herein is further characterized in that the C-shaped grip ring is uniformly radially and circumferentially contracted to substantially circular form with the circumferentially extending gripper teeth of saw-tooth configuration terminating in sloping edges which fade out to the crests in spaced relation from the respective ends of the ring to preclude the possibility of circumferential pinching of the tube material during assembly of the coupling.
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