Patent ID: 6708936
Filing Date: 2004-03-23
Classification: A61B,F16M,G02B

Abstract:
In a stand having a pivotable parallelogram carrier for supporting a load at a distal end thereof and a load-equalizing unit connected to said parallelogram carrier for compensating said load with respect to said parallelogram carrier, the improvement comprising:said load-equalizing unit acting in an equalizing direction at a constant force independently of said load; and a counterbalancing transmission between said load-equalizing unit and said parallelogram carrier for varying a point of action of said constant force on said parallelogram carrier relative to a pivot point of said parallelogram carrier, said counterbalancing transmission including a first arm rigidly connected to said parallelogram carrier and on which said point of action is located, wherein a counterbalancing moment about said pivot point produced by said constant force corresponds to a loading moment about said pivot point produced by said load.