| 摘要 |
A coupling device fitted onto an end of a hose into which a barbed nipple is inserted. The device is a rigid ferrule providing along its inner side two cylindrical portions of different diameters that are joined by a frusto-conical portion. The ferrule has a spiral thread of constant pitch formed on and along the inner side of all the portions. The thread in the larger cylindrical portion presses a shallow mating thread into the outside surface of the hose and initially advances the ferrule along the hose. The thread in the frusto-conical portion presses a progressively deepening thread into the hose and increasingly radially contracts the hose into the voids between the nipple barbs. The thread in the smaller cylindrical portion holds the hose contracted into the voids.
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