| 摘要 |
<p>An expansion plug comprises a tubular element (1) provided with a longitudinal slot (2) and having a hollow interior with a substantially rectangular cross section with generally parallel major sides, and a generally rod-shape support member (8) a shank (6) of which is co-operatively engageable in the interior of the tubular element (1) and having substantially the same cross sectional shape as that of the said interior of the tubular element (1) and having a screw thread or suitable grooves formed on the smaller sides.</p> |
