| 摘要 |
706,347. Flexible hoses; hose couplings. HOOVER, Ltd. June 20, 1951, [June 29, 1950], No. 14642/51. Classes 99 (1) and 99 (2). A semi-elastic sleeve 16 for protecting a hose 10, e.g. for a suction cleaner, against too sharp bending tapers .progressively in thickness and so that the thickness at the free end of the sleeve is less than at any other point. The sleeve, which may also decrease in diameter, surrounds and extends beyond the end of a rigid tube 23 secured to the hose which may comprise a helically-wound wire coil 11 covered by an extruded seamless tube 12 of polyvinylchloride or copolymers of vinyl-acetate, and a cord 13 of the same material as the tube wound between the convolutions of the coil 11 and bonded to the tube. The sleeve 16 may be cemented to a flanged ring 26 secured to the tube 23 and extending into the end of the tube 12. Adjacent turns of the coil 11 may lie between ribs 24, 25 of the tube 23, the hose being anchored to the tube by non-elastic cord 36 wound over a layer of friction tape 31. The tube 23 may form part of a fitting 14 secured at one end of the hose 10 and for the attachment of a dusting tool, and a fitting 15 may be secured to the other end of the hose for attachment to the suction cleaner. The fitting 15 may comprise a rigid tube 21 one end of which receives an inwardly turned portion 22 of an outer tapered tube 18 provided with a shouldered portion 19 to receive a hose protecting sleeve 17. Friction tape 30, 32 is applied over the end turns of the coil 11 and the tube 12, and the wall of the tube 23 is expanded outwardly as at 34 to force the wall of the hose into the recess formed by the shoulder 20 of the tube 18 and to anchor the end of the hose to the fitting 15. In modifications, there are described alternative ways for securing the hose to the hose end fittings by the use of friction tape and non-elastic cord, and in two of the embodiments the fittings have coupling members provided with a bayonet connection, Figs. 4, 5 and 6, (not shown). Specifications 648,562 and 673,043 are referred to. |
