Patent GB-784740-A (GB)
Title: Improvements in and relating to flexible hose assemblies
IPC: F16L33/01
Filed: 1952-12-11
Abstract: 784,740. Flexible hose assemblies; pipe joints. MELSOM, W. A., and BOWDEN (ENGINEERS), Ltd. March 10, 1954 [Dec. 11, 1952], No. 31460/52 Classes 99(1) and 99(2). A hose assembly comprises a flexible armouring consisting of one or more flexible metallic tubes and a separate inner tube of resilient material (with or without one or more tubular layers of textile reinforcing material) and closely sheathed by the armouring, the inner tube being secured between inner and outer members of end attachment, and the armouring having end attachments, the inner tube and the armouring being endwise clamped by clamping components cooperating with the attachments sc that the inner tube and armouring co-operate to form an armoured hose, the construction being such that the inner tube can be freed and withdrawn with its attachment through the armouring. In a modification the armouring may consist of one or more tubes of textile material. In Fig. 1 the armouring comprises two tubes 1, 1a of braided wire each tube being made of ribbon-like groups of fine high tensile steel wires braided to tubular form. One or each tube may have a fabric cover if desired. Inner and outer rings 2, 3 are anchored to the tubes by brazing, swaging or otherwise and/or by forcing the outer ring axially over the armouring around the inner ring. The inner tube 9 is of resilient material, e.g., of suitable thermoplastic synthetic material or a rubber preferably reinforced by a fabric e.g., cotton layer 10. The end attachments of this tube each consist of a ferrule A and an insert B which may be separate as shown or may be integral with or joined to one another. The ferrule is swaged or contracted around the end of the inner tube when member 17 is detached the inner tube can be displaced endwise to a small extent sufficient to enable a spring ring 16 to be removed. The members 17, 7 may be milled or knurled as shown at 23, 24. The member 17 may be constructed for coupling to other apparatus in any suitable way as shown being provided with a reduced boss 20 which is grooved to receive a ring 2 axially retaining on the boss a union nut 22, e.g., as disclosed in Specification 540,490, referred to. In Fig. 2 the end of armouring 1 is gripped between member 30, 31. A ferrule 35 provided with annular or helical, preferably continuous, grooves 36 is fitted to the end of the resilient tube 9 which may have a fabric reinforcement 10. A sealing edge 39 co-operates with a radial face 47 when the coupling is tightened and the members 30, 31 are forced towards one another. A split locking ring 42 is arranged in the groove 41 of each ferrule. In Fig. 3 the armouring is gripped between a collar 48 and the end of an inner ring 30a and between inner and outer faces of the ring 31a and the ring 30a. An armouring tube of textile material such as braided cotton tube or two or more of such tubes one within the other may replace the metal tube. The clamping components may be bolted together. If desired a layer or layers of fabric, e.g., cotton braid, or of rubber may be employed between the metal armouring layers. Textile reinforcing material including threads of synthetic material may be used. Gaskets may be used instead of edge to face sealing engagement. A close wound wire coil according to Specification 412,367, may be fitted. Specification 784,741 also is referred to.