| 摘要 |
<p>The assembly element (10) comprises an upper plate (12) having a given geometric shape and a lower plate (14) with overall analogous dimensions. The lower plate is fixed under the upper plate and is located so as to form an overhanging zone (14a,14c). This zone, on the perimeter of the upper plate passes beyond the edge of this plate. There is also a zone (14b,14d) which, on the other part of the perimeter, is withdrawn relative to the upper plate edge. The assembly element also comprises a second lower plate (16) which has withdrawn and overhanging zones relative to the upper plate. In a second mode of construction, a single lower plate has overhanging and withdrawn zones for each principal segment of the upper plate perimeter.</p> |
