| 摘要 |
The inner arch (30) on its side turned away from the stop surface and/or groove (315) is formed with an inner edge area (310) leaving a gap (7) freely ending in the direction of the wall face side (61) of the wall opening (60). In the inside of the rabbet structure (3) at a distance from one another are a number of holding components with free-ending clamp and holding parts formed as tabs. The clamp and holding tabs have an angled U-shape and with a support flank inside the inner arch (30), and preferably on the inside of the basic area, are fixed by welding or spot-welding.
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