| 摘要 |
The present cover is used for permanent sealing of an oval-shaped processing hole (7) in aluminum sheet metal (8) by means of an adhesive joint. The cover consists of a circular cover plate (1) of aluminum with a concentric cover edge (2) and a ring-shaped strip (3) of hot-melt adhesive applied within the cover edge (2). The interior region of the cover plate (1) is connected to a spring plate (5) aligned plane-parallel with the cover plate at a spacing of the thickness of the aluminum sheet metal (8). The outer edge (6) of the spring plate (5) has a contour that corresponds to the shape of the oval processing hole (7) and is somewhat smaller than the diameter of the hole (7). In the most separated edge regions (10) of the spring plate (5) there are quarter-circular spring tongues (11) punched at their free ends which tongues are springily formed at one end to the spring plate (5). After insertion of the spring plate (5) into the processing hole (7) up to contact of the adhesive strip (3) on the aluminum sheet metal (8), the spring tongues (11) can be brought to a tight fit by spring force against the back side of the aluminum sheet metal (8) by a quarter turn of the cover plate, and due to the spring force exerted by the spring tongues (11), they produce the necessary pressure on the adhesive strip (3).
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