Patent GB-566965-A (GB)
Title: Improvements relating to pipe couplings
IPC: F16L19/12
Filed: 1943-07-15
Abstract: 566,965. Pipe couplings. WURZBURGER, P. D. July 15, 1943, No. 11557. Convention date, Nov. 10, 1942. [Class 99 (i)] A pipe coupling of the kind described for instance in Specifications 403,870, 491,761, 492,336, 527,999, 528,306 and 534,291, comprising a coupling member B, Fig. 1, in which the end of the pipe P to be coupled is received, a sealing ring R which encircles the pipe, and a second coupling member or nut N which when the parts are coupled together, moves the sealing ring axially so that it tightly grips or cuts into the pipe, has a gasket or washer 18 of vibration damping material such as rubber or the like interposed between the sealing- ring and the coupling-member B. In the form shown in Figs. 1 and 2, a second rubber or like washer 31 is located within the nut N and retained by a flanged sleeve 32 which when the nut is screwed up engages the end of the sealing ring. The pipe P abuts against an inturned flange 15 on a member 13 which is shouldered to accommodate the washer 18 and has an internal conical surface 10. This member is retained by an internal flange 23 on the coupling-member. When the coupling is made, axial movement of the sealing-ring causes the conical surface 10 to contract the seating-ring so that a cutting-edge 11 thereon bites into the pipe, Fig. 2. In a modification, the flanged sleeve 32 has a conical surface engaging a similar surface on the sealing-ring, so that when the joint is made the rear part of the sealing-ring is -contracted on to the tube with a force which may cause slight deformation thereof. The corners of the washer 18 may be provided wibh metal reinforcement to prevent flow of the washer'material into the clearance spaces shown in Fig. 1. In another modification, Fig. 4, the selling-ring Rb may have an extension 52 which is flanged at 53 and a conical surface on the sealing-ring is engaged by a similar surface on a metal ring 50 abutting against a resilient washer 31. In this form also there may be slight deformation of the pipe owing to the pressure of the conical surface on the ring 50. In another modification, the rubber washer 18 has an internal conical surface covered by a conical metal sleeve which engages the forward end of the sealing-ring and causes the cutting edge 11 to bite into the pipe. In a further modification, Fig. 7, the coupling member has two surfaces 72, 73 of different cone angles and a cylindrical surface 75. The washer 80, which may be in one or more pieces, engages over a rib 79 on the sealing-ring and is moved axially when the coupling is tightened by a metal ring 76 so that the cutting edge 78 .on the ring is forced into the pipe and the pipe is bulged inwardly, as shown, by the central part of the sealing ring. In another modification, Fig. 11, the pipe abuts against a flange on a ring member 100 enclosing a washer at 22 and retained by a spring ring 101. Conical surfaces 73 on the coupling-member and 112 on the member 100 coact to apply inward pressure to the rubber or like member 80 when the coupling is tightened, thus causing the sealing-ring Re to grip the pipe.