Pipe and tube coupling

Claim 1

A pipe, tube or hose coupling, comprising: A. a first generally cylindrical tubular member formed with: A1. an end face, A2. a radially outwardly open circumferentially continuous groove of generally rectangular section axially inwardly of said end face, A3. an outwardly open circumferentially continous recess axially inwardly of but substantially adjacent said groove, and A4. a circumferentially continous radially projecting shoulder of generally rectangular section between said groove and said end face; B. a second general cylindrical tubular member formed with: B1. an end face, B2. an arcuate segmental shell portion projecting axially from the end face of said second member, B3. a radially inwardly extending arcuate segmental bead of generally rectangular section receivable and form fitting in said groove upon radially nesting and coaxial alignment of said members to prevent axial separation thereof with said shell portion cradling said first member, B4. a radially inwardly open segmental recess receiving said shoulder, said end faces being axially spaced apart by a substantial distance upon such radial nesting of said members to define a radially open flow passage for a fluid traversing said members, and B5. an outwardly open circumferentially continous recess axially inwardly of but substantially adjacent the end face of said second member; C. a tubular generally cylindrical sleeve formed with a laterally open fitting for connecting a duct to said coupling in communication with said passage between said end faces, said sleeve having an axial length greater than the axial distance between said circumferentially continous recesses upon radial nesting of said members, and being shiftable over said members to enclose said recesses, said shell portions and said passage while fitting closely around said members; and D. respective sealing rings received in said circumferentially continuous recesses in all-around sealing relationship between the external peripheries of the respective members and an inner wall of said sleeve.