| 摘要 |
An anchor comprises first, second and third flanges. A surface of the first flange facing the second flange defines a plane. A contour of the first flange projected onto the plane extending beyond a contour of the second flange projected onto the plane. A base connecting part includes the third flange and the second flange. An accessory connecting part operatively connected to the base connecting part includes the first flange. The third flange is movable relative to at least one of the first and second flanges between a first position and a second position. In the first position, a contour of the third flange projected onto the plane is contained within the contour of the second flange projected onto the plane. In the second position, the contour of the third flange projected onto the plane extends beyond the contour of the second flange projected onto the plane. |
