| 摘要 |
<p>The hook has an lower plate (11'') with an inlet toboggan and an outlet toboggan on both sides of shearing line, and an upper plate with holes to let crampon grip pass through the holes. Each toboggan has a rectangular boss (14) constituting a tab (13) and a valve bridge (12). The boss has radius at top and at base along sides of a rectangular shape. The bosses are arranged in the lower plate to permit subjection of a crampon grip (2) against the boss and the tabs by conjugation of the corresponding valve bridges.</p> |
