| 摘要 |
The two lips (8,9) in intersecting planes are joined together along their adjacent sides. The lip joint is formed by a web with fasteners (12) provided on the web side, away from the lips. The fastener is pref. in the form of an open groove in the web, which is integral with the lips. The web can alternatively be of U-section, with one lip at the free end of one shank, and the other one at the shank root. |
