| 摘要 |
<p>PURPOSE: A support structure for boss is provided to improve the filling performance of the boss by providing a protrusion part at the corner part of each boss. CONSTITUTION: A base plate(11) forms a bottom surface of a frame body. Multiple bosses(17) comprise a body part(31) generated in a form of a cylinder and a boss part(33). The boss part has a common axis from the body part for extension. Four reinforcing ribs(21) are formed on an outer circumferential surface of the boss. A protrusion part(37) is formed at the connecting part of the upper surface of the reinforcing rib and the outer circumferential surface of the boss.</p> |
