Patent ID: 8567271

Claim:
A vertical movement device for an examining table, the vertical movement device comprising: a first driving wheel disposed on the examining table; a nut and screw pair, wherein a rotation axis of the nut is perpendicular to a rotation axis of the first driving wheel, and the nut is operable to move vertically along the screw when the nut rotates and carry the examining table to move the examining table vertically; a direction-converting synchronization belt operable to convert a rotation of the first driving wheel into the rotation of the nut; a reduction wheel disposed on the examining table, the diameter of the reduction wheel being larger than the diameter of the first driving wheel, and a rotation axis of the reduction wheel being parallel to the rotation axis of the first driving wheel; a reduction synchronization belt wound around the reduction wheel and the first driving wheel; and a second driving wheel installed coaxially with the reduction wheel, the direction-converting synchronization belt operable to convert a rotation of the second driving wheel into the rotation of the nut.