Connector for plastic tube

Claim 1

In combination, a plastic tube and a connector for anchoring said tube at one end in a sealed and functional relationship to permit the passage of fluid under pressure which comprises: a. a flexible tube formed of plastic of the general character of vinyl and nylon having an unflexed normal outside diameter D4, b. a connector formed of a relatively hard material such as metal having an internal circular tube receiving recess extending generally axially therein with an integral stop seat with a generally radially inwardly extending wall adjacent one end thereof to abut one end of said tube when inserted therein, an integral axially extending generally cylindrical sealing surface within said tube receiving recess adjacent said stop seat having a diameter D1 slightly smaller than said diameter D4 to lie in sealing relation with the outside of said tube adjacent said one end thereof, an integral first annular portion within said tube receiving recess generally axially spaced from said sealing surface, said first annular portion being tooth-shaped in cross-section to project generally radially inwardly to grip the outer surface of said tube and having a minimum diameter D2 slightly smaller than diameter D4, an integral second annular portion generally axially spaced from said first annular portion and located adjacent the mouth of said circular tube receiving recess, said second annular portion extending generally radially inwardly and being coaxial with said generally cylindrical sealing surface to stabilize the shape of the portion of said tube within said tube receiving recess if there is a sharp bend in said tube outside said connector, and first and second generally annular recesses extending generally axially within said tube receiving recess and being locateD immediately adjacent said first annular portion on generally axially opposed sides thereof, said first and second generally annular recesses each having a diameter substantially larger than the outside diameter of said tube to permit said tube to expand into said recess on both sides of said first annular portion to retain said tube within said connector.