Tube coupling

A releasable tube coupling comprising a body having a bore extending axially therethrough, said bore having an open end for receiving said tube, a resilient, annular tube clamping sleeve in said bore, said sleeve having a central bore through which the tube is adapted to be inserted, said sleeve being circumferentially contractible to cause the bore thereof to tightly grip the outer cylindrical surface of the tube, said body having a pair of apertures extending therethrough in a direction transversely of the axis of the bore, said apertures intersecting said bore and being spaced apart symmetrically with respect to the axis of the bore, the outer surface of said sleeve having a pair of diametrically opposed, radially outwardly inclined cam surfaces thereon, said cam surfaces being aligned one with each of said apertures and clamp means extending through said apertures and engaging said cam surfaces such that the inner periphery of the sleeve at least frictionally engages the tube inserted therethrough, said apertures restraining movement of said clamp means in a direction axially of the bore and radially outwardly of the bore, whereby, when an axially outward force is applied to the tube, said clamp means bear against said cam surfaces and exert radially inwardly directed force against said sleeve to more firmly grip the tube.