Adapter coupling for liquid chromatography device

Claim 1

A universal adapter for holding a piece of tubing in fluid sealing relationship alternatively with either an internally or externally threaded coupling member for liquid chromatography equipment, said adapter comprising a. a holder including axially aligned first and second holder segments, b. means matingly securing together said first and second holder segments, c. a central passage extending axially between opposite ends of said holder through said holder segments when secured to one another, at least a portion of the central passage extending through said first holder segment being internally threaded for mating with a coupling member having external threads, d. an enlarged central cavity in said holder in registration with said central passage, and e. an elogated sealing insert for said holder, said insert being situated partially in said passage and including i. a first end portion disposed wholly within the internally threaded portion of the central passage of said first holder segment, ii. a second end portion extending outwardly beyond said second holder segment, said second portion being externally threaded for mating with a coupling member having internal threads, iii. a longitudinal bore extending the length of said insert and adapted to receive therethrough a piece of tubing, iv. an integral ferrule seat formed at each end portion thereof, and v. an enlarged collar intermediate said first and second end portions, said collar being located in the enlarged central cavity of said holder, whereby said first and second holder segments will hold said insert in position for sealing engagement with the coupling member when the adapter and coupling member are threadedly engaged.