PIPE-LINE COUPLING Russian patent published in 2003 - IPC

FIELD: pipe-line coupling for connection to the pipe end, made of polymeric material and designed for water-supply and heating systems. SUBSTANCE: the pipe-line coupling has an inner bushing designed for insertion into the pipe end and for fit to the inner surface of the pipe end. The outer bushing is provided with a slotted clearance and means for adjustment of the clearance width. When the outer bushing is in the tightened, specified position, the bushing seems to be cylindrical inside and outside. The central axis of the outer cylindrical surface of the outer bushing is located at a certain distance from the central axis of the inner cylindrical surface of the outer bushing. In the tightened, specified position of the outer bushing the inside radius of the bushing is less than the outside radius of the pipe end. The outer bushing has one or more closing bosses. The closing bosses are fixed in the closing grooves. EFFECT: enhanced reliability of coupling. 10 cl, 9 dwg