| 摘要 |
<p>In the first embodiment, the faceplate coupling ring (D) is of conventional design and includes an axially extending rib (16) with a radially outwardly extending rim (18) and a radially inwardly extending deflectable sealing strip (20). The pouch coupling ring (C') includes inner (32) and outer (34) spaced walls, forming a channel for receiving the rib (16). First (38) and second (40) protrusions extend inwardly from points on the interior surfaces of the walls (32,34) proximate the ends thereof. The first protrusion (38) cooperates with the rim (18) and the second protrusion (40) cooperates with the tip of the sealing strip (20), to securely retain the rib (16) within the channel. The walls (32,34) of the channel have reduced thickness and are easily deflectable as the rib (16) is inserted into the channel, such that coupling of the rings (C',D) is facilitated but decoupling requires the conventional amount of force due to the second protrusion (40). In the second embodiment, the deflectable sealing strip on the faceplate coupling ring is replaced by a rigid flange (46) which cooperates with the second protrusion (40) to substantially increase the decoupling force. <IMAGE></p> |
