Hose-coup′ling.
A jointpiece or pair of interlocking connecting pieces, by which ends of hose-sections are joined together in line. There are many forms. a has a swivel which fits against a collar on the nipple, and its flanges are engaged by the sleeve, which also screws upon the back screw on the other nipple, pressing the ends of the sections against the intervening annular packing. In b, the segmental rib and projected screw-block of the outer coupling-piece enter a circumferential groove of the other piece. In another ordinary form, the sections of hose are bound with wire, or thimbles upon collarpieces, one of which has a threaded exterior and the other a threaded sleeve, which screws upon the former. A spanner or wrench is used to tighten the connection. In c, a portion of the threads on the screw and socket are cut away to enable the parts to be slipped past each other, and lock by a partial revolution, when the undivided threads catch and complete the joint. d. The two parts are slid together and the pins enter their respective grooves at the opposite sides; the handle is then turned, and the cam-head locks the parts together. e. The packing-ring is formed to enter two rectangular annular grooves in one part of the coupling and a V-shaped annular groove in the other part. f. The projections on the outer cylinder interlock with a groove in a collar on the inner cylinder. Expansible packing is enclosed between collars and is forced against the outer cylinder by compression. The hose is brought over the convex, circumferentially grooved ends of the coupling and confined by a screw-threaded ring. In the Westinghouse coupling for air-brake pipes of railway-cars, the parts are connected by a spring- [1132] hook fastening. Each half-coupling contains a puppet-valve which seats outwardly. Guiding wings are made on the valve-stems, and the stems project outwardly such distance that when the hose are coupled up, the stems, coming end to end, will each unseat the other valve. Hence, when the couplings are united, the valves will always be open, and vice versa. See brake. |
| Hose-couplings. |
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| Hose-fittings. |
