| 摘要 |
<p>PROBLEM TO BE SOLVED: To follow a curving bottom to a bending section of a body that is different in positions from a structure of a user's body by disposing the curving bottom to a bottom of a bed and by providing a mechanism for easily controlling the bending position to the curving bottom itself. SOLUTION: A knee bottom 10a and a foot bottom 10b are connected with a curving bottom 11. This curving bottom 11 has cross-section keyhole-shaped grooves 12 that open expanding outwardly from a lower surface at proper intervals and are arranged to a width direction of the bottom. The curving bottom 11 further has engaging members 13 for engaging to the keyhole-shaped grooves 12, and is constituted to bend inwardly from the lower surface at a center of the keyhole-shaped groove 12 without the engaging member 13 when the engaging members 13 are selectively taken out of an engaging state where the engaging members 13 are engaged to the keyhole-shaped grooves 12.</p> |
