Patent GB-740763-A (GB)
Title: Improvements in and relating to flexible hose couplings
IPC: F16L33/01
Filed: 1952-12-11
Abstract: 740,763. Hose couplings. MELSOM, W.A., and BOWDEN (ENGINEERS), Ltd. June 11, 1953 [Dec. 11, 1952], No. 31459/52. Classes 99(1) and 99(2). In a coupling for a hose comprising a layer 3 of flexible reinforcing material, e.g. ribbon-like groups of high-tensile steel wires braided to tubular form and embedded between inner and outer layers 1, 2 of resilient material such as natural, or synthetic rubber, the layers 2, 3 project beyond the layer 1 and the layer 3 is separated from the layer 2 and gripped between rings 6, 7 as the result of pressure caused by relative axial movement and holding together of clamping members 12, 18. The internal surface of the ring has grooves or threads 62 and forms with a tapered insert 22a projecting into the hose an annular space of progressively lessening cross-sectional area, the insert being forced into the hose to squeeze the projecting portion 4 of the layer 2 to form a sealing member in the annular space and to key that portion to the inner surface of the ring. The annular space is sealed off by a metal-to-metal or gasket seal between members of the coupling. As shown, the ring 6 has an extension 61, which may be a separate part, abutting and sealing with a collar 60 of the insert 22a which collar may have one or more sharp, annular ridges to sealingly engage the face of a member 54a co-operating with apparatus to which the hose is connected, that member being coupled to the member 12 by a ring or circlip 55 ; alternatively, the ridges are formed on the member 54a or a gasket seal is used, or the member 12 engages the collar 60, one of the co-operating faces having annular ridges to form a seal, or a gasket seal is employed. The insert 22a may be extended for connection to the apparatus, the collar 60 being curved or otherwise shaped to promote a fluid-tight seal. 'A space 22 accommodates the ungripped portion of the layer 3. The ring 6 may have a wedge-like, chamfered or rounded end face 8, and the ring 7 may be integral with the member 18 or a separate ring abutting an internal shoulder of that member ; alternatively, the face 8 is conical or tapering and of the same angle as that of the face 9 of the ring 7, but may be of a different angle or curved to confine the gripping zone between the rings to or more nearly to a circular line or narrow band. As shown, the members 12, 18 are screwed together, but the members may be bolted together, in which case the insert forms an integral part of the member 12. The member 18 may be slidden or screwed onto the body of the hose. The insert 22a may extend into the hose beyond the rings 6, 7 and be apertured so that internal fluid pressure forces the sealing member 4 outwards and against the ring 6. The reinforcing layer 3 may have a fabric covering which, preferably, is removed so that the layer is directly gripped, or may comprise fabric when one or more of the gripping surfaces is or are made of a soft material to grip the fabric without damage ; also, the reinforcement may comprise more than one layer separated by layers of canvas or rubber, the inner layer being gripped and the associated layer of rubber being forced into the interstices of the reinforcing layer.