Tubing coupling

Claim 1

A pressure-responsive, quick-releasable coupling for sealingly connecting a fluid passage to a section of tubing having a smooth cylindrical external surface without distorting said tubing or marring said cylindrical surface comprising: a. a rigid housing having a through fluid passage therein, said passage including an intermediate axial, annular chamber in axial communication with and surrounding said passage and of a cross section greater than said passage; b. a deformable cylindrical sleeve extending axially within said passage and having: 1. a first portion of the length of its outer surface in sealing contact with the internal wall of said housing and including means axially restraining said first portion against movement relative to said housing, 2. a second portion of the length of its outer surface extending axially from said first portion and disposed free from contact with said housing and extending substantially the length of said axial, annular chamber and having a free end terminating short of one end of said chamber, said second portion being in fluid communication with said fluid passage, and 3. an internal cylindrical sUrface terminating short of said free end and of a size forming a slight interference fit with said tubing external surface along its entire length when said tubing is inserted into said sleeve, and 4. an annular sealing portion within said chamber and projecting radially inwardly at the end of said second portion of said sleeve and having an internal diameter substantially less than the diameter of said sleeve internal cylindrical surface whereby said sealing portion forms a tight initial seal against said tubing external surface when said tubing is inserted through said sleeve and insuring that pressure buildup in said chamber will annularly compress said free, resilient second sleeve into increasing sealed relation about said tubing.