PROBLEM TO BE SOLVED: To solve problems that elements of a mechanism occupy a large space in the conventional back/knee bottom interlocking mechanism and the conventional operation mechanism for selectively releasing the interlock uses a spring and the like and requires the large number of components.SOLUTION: A bed is provided with pushing-up arms 6a and 6b and interlocking arms 7a and 7b at drive shafts 5a and 5b rotatingly driving a back bottom 2 and a knee bottom 3 respectively, an interlocking link 8 is connected between the interlocking arms, and the knee bottom is rotatingly driven by being operatively connected to the knee joints. The pushing-up arms of the back bottom side and the knee bottom side are disposed to rotatingly driven in the same direction of the respective bottoms, the interlocking arm in the back bottom side is projected upward with respective to the driving shaft, the interlocking arm in the knee bottom side is projected downward with respective to the driving shaft, the knee bottom-side end of the interlocking link has a connection slit 9 in its longitudinal direction to movably engage the interlocking shaft 10 provided at the interlocking arm of the knee bottom side, and the interlocking link operatively constitutes the moving prevention member 11 engaged with the interlocking shaft.COPYRIGHT: (C)2010,JPO&INPIT【課題】従来の背膝ボトム連動機構では機構の要素が大きなスペースを占有してしまっている。また連動を選択的に解除可能な従来の操作機構では、ばね等を用いているので部品点数が多い。【解決手段】本発明では背ボトム2、膝ボトム3を夫々回転駆動する駆動軸5a、5bに押上腕6a,6bと連動腕7a,7bを設け、それらの連動腕間に連動リンク8を連結し,背ボトムに連動して膝ボトムを回転駆動可能に構成したベッドにおいて,背ボトム側と膝ボトム側の押上腕は夫々のボトムと同方向に回転駆動する配置とし,背ボトム側の連動腕は駆動軸に対して上方側に突設し、膝ボトム側の連動腕は駆動軸に対して下方側に突設し,連動リンクの膝ボトム側端部には,その長さ方向に連結スリット9を設けて膝ボトム側の連動腕に設けた連動軸10を移動可能に係合し、連動リンクには連動軸に係合する移動阻止部材11を操作可能に構成した連動機構により課題を解決する。【選択図】図1
