This creation includes: a foot frame for supporting the groundA set of middle-level frames arranged at the foot frame and in relative motion with each otherAnd an upper frame for mattress assembly and relative motion with the middle frame,Wherein: the foot frame comprises a supporting foot which is supported on the groundThe foundation frame assembled at the supporting footThe platform plate assembled at the base frameThe power plant assembled at the platform plateAnd a swing arm connecting rod assembled at the base frame and used for connecting the middle frame；The middle layer frame comprises a frame body for the swing arm connecting rod groupAnd a roller arranged at the frame body,The roller is butted against the upper frame,It can be used as the limit basis of the upper frame when it moves horizontally or vertically；The upper frame comprises a main frame for guiding and limiting the rollerAnd a joint part arranged at the main frame,One end of the connecting part is movably arranged at the power plant.本創作包括：一支撐地面用的腳框架、一組設於該腳框架處暨彼此間呈相對運動的中層框架、以及一供床墊組設用暨能與該中層框架呈相對運動用的上層框架，其中：該腳框架包括支撐於地面處的支撐腳、組設於該支撐腳處的基框架、組設於該基框架處的平台板、組設於該平台板處的動力裝置、以及組設於該基框架處暨連結該中層框架用的擺臂連桿；該中層框架包括一供該擺臂連桿組設用的框架體、以及組設於該框架體處的滾輪，該滾輪係抵頂於該上層框架處，以作為上層框架在呈水平或垂直移動時的限位依據；該上層框架包括一供該滾輪導引限位用的主框架、以及組設於該主框架處的結合部，該結合部一端係活動地組設於該動力裝置處。
