| 摘要 |
An assembly system comprises a connection tube (11) of flexible sheet material. The connection tube (11) has at its end a rigid frame element (13) which is larger than a rigid frame element (15) formed in similar manner but of smaller dimensions. The larger frame element (13) and the sheet material affixed thereto are pushed through the smaller frame element (15) and drawn tight against the latter for sealingly urging the flexible sheet material thereagainst. |
