| 摘要 |
<p>PURPOSE:To increase the resistance against the bending of a thigh member and remove a bone breakage accident and the trouble on the joint movement by forming a connection section with a slowly increased longitudinal section at the portion from joint front and rear walls to reinforcing ribs. CONSTITUTION:The upper edge a5 of each reinforcing rib a4 has a shape approximate to the inner periphery shape of a thigh member A constituted of inner wall faces of a front wall al, a support wall a2, and a rear wall a3, and a connection section a6 with a slowly increased longitudinal section from the front wall a1 and the rear wall a3 to a reinforcing rib a4 is formed. When connection sections all, a31 at the front and rear ends of the rib a4 are considered as dangerous cross sections against the bending load, the dangerous cross sections are continuously distributed in the spread of the connection section a6 without being concentrated at one vertical position along the longitudinal direction, and the resistance against the bending load is sharply improved.</p> |
