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COUPLING FOR TUBING

  • US 3,837,687 A
  • Filed: 12/29/1972
  • Issued: 09/24/1974
  • Est. Priority Date: 12/29/1972
  • Status: Expired due to Term
First Claim
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1. A releasable fitting for forming a seal to an inserted tube, including containing means having an opening for admitting a tube and limiting the maximum diameter of a tube that may be inserted, an elastomeric sealing ring in said containing means, said sealing ring and said opening being disposed about a common axis at spaced-apart positions along the axis, said sealing ring having a surface smaller in diameter than said maximum diameter for forming a seal to an inserted tube, and release means in said containing means for causing a force to be applied to an annular portion of said sealing ring close to but free of contact with said seal-forming surface for enlarging the diameter of the sealforming surface greater than said maximum diameter, whereby a tube may be inserted and removed from the fitting when the sealforming surface is enlarged as aforesaid without rubbing and possibly damaging the seal-forming surface.

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