Two-piece coupling device for fluid exchange

Claim 1

A two-piece coupling device for the exchange of liquid or gaseous media, of the type having a detachably connectible first coupling part and second coupling part, each including a flow duct, and two tubes respectively connected to said coupling parts, wherein the improvement comprises: a said first coupling part including a sleeve a longitudinal central passage and an axially projecting extension including at least one stepped portion, a jacket at least partially surrounding said extension, a first detachable fastening means, and a resilient hollow body secured at one end in said jacket, automatic blocking means for preventing the flow of the media through said hollow body when said first coupling part is separated from said second coupling part, a said second coupling part including a second detachable fastening means co-operating with said first detachable fastening means co-operating with said first detachable fastening means and a hollow projection extending toward said first coupling part, said projection entirely surrounding said extension and partially surrounding said jacket; said jacket including an axial prolongation, said first fastening means being an external thread on said prolongation, and said second fastening means being an internal thread with said second coupling part; and the end of said hollow body remote from said jacket being secured in said sleeve, and said extension comprising first, second and third sections, said first section being directly adjacent to and smaller in diameter than said sleeve and including a circumferential groove and a sealing ring disposed in said groove, said second section being directly adjacent to and smaller in diameter than said first section, said third section being smaller in diameter than said first section, directly adjacent to and larger in diameter than said second section, and including two diametrically opposed axially and radially extending recesses, part of said automatic blocking means being disposed in said recesses.