| 摘要 |
<p>The ram has a ram shank, a base, and one or more extension sections (4), fastened to the shank (2), by screws with heads inserted by impact. The connection is by flat connection elements (5, 6) e.g. straps, which overlap and are screwed to both shank and extension section. The upper end of the shank and the lower end of the extension receive the impact screws, and the straps are have bores (8) at equivalent points. The screws have special ribbing near the screw head, which engages into the wall of the bores.</p> |
