| 摘要 |
A hose end coupling unit which has an expandable interlocking snap ring interconnecting a plug member inside a socket member. The interlocking snap ring has a countersunk or funnel-shaped mounting hole, which fits over a frusto-conical cam surface on the plug member and is expanded thereby, as the plug member is inserted into the socket member, into an internal groove within the socket, and is held in an expanded state confined in the groove, after passing over the cam surface, on a cylindrical shoulder portion on the plug member. A spacer snap ring nested in an external groove in the plug member, outside the socket member, prevents the plug member from being inserted deeper into the socket member once the interlocking snap ring is seated on the shoulder portion. An O-ring seal at the entrance of the socket member seals the interconnected plug and socket members. Removal of the spacer snap ring from the external groove permits withdrawal of the plug member from the socket member by further insertion of the plug member into the socket member to a depth where the interlocking snap ring is forced into a second external groove in the plug, inside the socket, diametrically inwardly of the shoulder portion, and which is of a diameter and of an axial width that allows the interlocking snap ring to contract to the normal unexpanded size within the confines of the second external groove, thereby freeing the interconnecting snap ring from confinement in the internal groove and unlocking the plug from the socket.
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