Releasable push-to-connect tube fitting

A tube fitting comprising:

• a tubular body defining a through axial bore, said body having an axially outer end defining a radially inner surface defining the axially outer end of said bore and including an axially outer first cylindrical portion, and an axially inwardly widening frustoconical axially inner portion, said body further defining an axially inner end;
• means on radially outer surface of said body axially inner end for sealingly securing said body to an element defining a cylindrical port adapted to receive said body inner end comprising a first, axially inner, annular tooth having an outer diameter preselected to have a first interference fit with the element in the port thereof, and a second, axial outer annular tooth having an outer diameter larger than the outer diameter of said first tooth and being preselected to have a second interference fit with the element in the port thereof;
• and
• an annular collet for coaxially receiving the end of a tube for connection to said body in said bore, said collet defining an axis and being coaxially received in said bore outer end and having a tubular midport, an axially outer radially outwardly turned flange axially outwardly of said body outer end and having an outer diameter no greater then the minimum outer diameter of said body outer end, an axially inner end radially inwardly of said frustoconical inner portion of the bore outer end and having a radially outwardly projecting camming portion, and a radially inwardly directed tube gripping portion, said collet further having at least one longitudinally extending slot at said axially inner end permitting constriction of said collet inner end as an incident of the collet being urged axially outwardly with said camming portion engaging said frustoconical bore surface portion, the total slot width circumferentially of the collet axis being preselected to cause the minimum outer diameter of said camming portion when said inner end of the collet is fully radially constricted to be greater than the diameter of the outer end of said frustoconical bore surface portion.

A releasable tube fitting comprising:

• a body provided with a through bore, said body having an axially outer portion, said bore defining a cylindrical inner surface at the axially outer end of said bore opening through said body outer portion, and a radial stop surface at the axially inner end of said axially outer portion of the bore;
• a split resilient tubular bushing in said axially outer end of the bore resiliently biased against said cylindrical surface, an axially inner end portion of the bushing defining a radially inner axially inwardly widening frustoconical wedging surface;
• an annular collet for coaxially receving the end of a tube for connection to said body, said collet defining an axis and being coaxially received in said bushing and having a tubular midportion, an axially outer radially outwardly turned portion axially outwardly of said body outer portion and having an outer diameter greater than the inner diameter of said bushing at the axially outer end thereof, an axially inner end radially inwardly of said frustoconical wedging surface of the bushing and having a radially outwardly projecting camming portion, and a radially inwardly directed sharp tube gripping portion, said collet further having at least one longitudinally extending slot at said axially inner end permitting constriction of said collet inner end as an incident of the collet being urged axially outwardly with said camming portion engaging said frustoconical wedging surface, the total slot width circumferentially of the collet axis being preselected to cause the minimum outer diameter of said camming portion when said inner end of the collet is fully radially constricted to be greater than the diameter of the axially outer end of said frustoconical wedging surface;
• and
• a tubular eyelet receiving coaxially in said bore adapted to be disposed within a tube end inserted coaxially inwardly through said collet for connection to said fitting.