Concealed bearing for the leaf of a window pivotable relative to the frame

摘要

The concealed storage has an upper bearing assembly (3) and a lower bearing assembly (4), each having wing-side fitting portions and frame-side fitting portions. The fitting portions are interconnected through a control rod and a supporting arm. The supporting arm has a smaller length in comparison to the control rod. The positions of the bearings of the control arms and the support arms are displaced to the fitting portions, in which the control rods or support arms of upper and lower bearing assemblies are of different lengths.