| 摘要 |
The present invention consists of male and female parts of plane faced segments. A male, square section stem projects perpendicularly from the plane faced segment of the male part. The stem on its free end has a widening in the shape of a hook. The female plane faced segment has a deep cavity such as a runner for inserting the male stem. The cavity extends perpendicularly into the interior of the female plane faced segment with a space congruent with the stem. The cavity has elastically deformable walls and on one of the external walls of the cavity an anchoring opening for the widened end of the male stem of the other plane faced segment.
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