| 摘要 |
The present invention relates to a plug which can be put into holes, es - pecially into drilled bore holes of walls, which plug effects a surprising solid tightening for example in lay brick-walls also in such cases in which the hole or the plug has at least partly sizes and especially varying di- ameter-dimensions, which do not allow the use of the so-called spread- plugs known in the prior art. The plug according to this invention is con- sisting in an inner drum preferably in the shape of a pyramid-stump made out of a hard material and in a outer drum made out of extendable mate- rial, whereby the outer drum is connected with the inner drum for exam- ple by welding.
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