| 摘要 |
<p>For fastening a screw-threaded socket in a receiving material 3 having cavities 3a, the socket comprises an apertured tube 1 in which is arranged a deformable sheath 2 which is filled with an effervescing composition 4. As a result of internal pressure caused by effervescing of the composition, parts of the sheath 2 are forced outwards through the apertures 1b so that they project radially beyond the outer surface of the apertured tube 1 so that the socket is anchored in the cavities 3a of the receiving material 3. <IMAGE></p> |
