| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve a backache by correcting an off-centered posture while relaxing a stress caused in a sacroiliac joint in daily life. <P>SOLUTION: A cushion 10 includes: a seat portion 12 for reducing a load by the body weight of a sitter 50; a sacrum contact tool 22 which contacts a sacrum 42 or coccyx 44 at a position on the body lower side from a line connecting a pair of spina iliaca posterior superiors; and an ilium contact portion 30 which contacts an ilium 46 at a position on the body upper side from the line connecting the pair of spina iliaca posterior superiors. When the sitter 50 is seated in the seat portion 12, a sacrum raising moment M1 acts on the sacrum 42 which has received an external force F1 through the coccyx 44. An ilium forward-tilting moment M2 acts on the ilium 46 which has received an external force F2 from the ilium contact portion 30. The posture of the pelvis is corrected by the effect of these moments M1, M2 to relax or dissolve the stress of the sacroiliac joint 50, and the backache is consequently improved. <P>COPYRIGHT: (C)2012,JPO&INPIT |
