| 摘要 |
A motor-adjustable head rest for operating tables comprises a head plate ( 12 ) which is arranged at one end of a curved support shaft ( 24 ) which, in a plane which is perpendicular with respect to the axis of curvature, is guided in an adjustable manner on a support between three rollers ( 26, 28, 30 ) which are spaced from one another in the direction of adjustment, which support can be connected to the operating table. The tracks ( 32, 34, 36 ) for the rollers ( 26, 28, 30 ) which are formed on the support shaft ( 24 ) are shaped such that their instantaneous curvature centers in each position of the support shaft ( 24 ) coincide with the instantaneous center of rotation of the head movement during the lifting and the lowering of the patient's head ( 14 ) resting on the head plate ( 12 ).
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