| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bed device which enables a user to stabilize his or her posture and to maintain a cozy seating posture after raising the back. SOLUTION: This bed device is divided to a seat plate and a back plate and mattresses are respectively placed on the seat plate and the back plate. The device is provided with a mechanism of deforming the back plate segment corresponding to the user's lumbar vertebra on the mattresses to a projecting shape in raising the back plate and simultaneously sinking the segment near the back plate side of a floor plate so that the user raises the back in the state of maintaining this state.</p> |
