Patent ID: 7694367

Claim:
A structure for supporting a patient comprising: a base; a planar member configured for supporting a patient; a linking assembly connecting the planar member with the base, the assembly including a first and second pair of connecting arms, each arm being bent at a commonly shared coaxial fulcrum point; and a driver; an actuator assembly operably connected to the linking assembly and the base for moving the planar member from a first position to a second position, wherein the actuator assembly further comprises a screw actuator rotatably connected to the driver, a driver nut mounted about the screw actuator, and a pull arm pivotably connected to the driver nut and rigidly connected to a pivotable connecting rod, said connecting rod is connected to said first and second pair of connecting arms at each pair's fulcrum point, wherein said connecting rod defines a longitudinal pivotal axis extending coaxially through each pair's fulcrum point, such that as driver nut is rotated and moved along said screw actuator, said pull arm pivots about the longitudinal pivotal axis and exerts a force on said connecting rod.