the bed the rollers allow for motion between the plate 175 and bed frame 15 due to the displacement between the lift arm pivot axes 151 and 152 and the bottom edges of bed frame 15 fig4 is a partial sectional end view of the bed and elevating mechanism showing roller 174 and support plate 175 fig5 is a schematic side or end view of a bed equipped with a roller driven transport sheet and roller drive means not shown the tilting mechanism 182 183 represents that in fig2 or fig3 the transport sheet 177 can be moved across the bed by being wound up in roller assembly 179 and unwound from roller assembly 178 or vice versa the transport roller assemblies which may vary greatly in design are located at opposite ends or sides of the bed and are not used during and do not interfere with the bed tilting operation fig6 is a partial elevation view showing a hand crank 177 which couples to worm screw 178 supported from member 150 by bracket and bearing 178 and which can be used in place of motor drive 140 in fig2 and 3 in other embodiments of this invention fig7 is a partial elevation sectional view showing an alternate method of supporting a patient during the tilting operation mattress 179 is constructed with slots 180 which allow it to.