| 摘要 |
The invention refers to the problem of self-adjustment of the angle of seat back for different sitting positions (from the errect sitting to half-lying). Self adjustement of seat back entails bringing the back into the new sitting position without demanding active act of the user without spontaneous and body activity: movement of user forward on the seat with the simultaneous pressures on the back in the upper part, so that the user would "fall" into the armchair. On this occassion, there is lessening or extinction of pressure on the back of the seat, so there is no force to deform the ellastic element with which the back part of the seat hangs on the sides of the armchair (it is returned in the initial position), elastic element is the axis of the back which does not block the rotation of thestiff lever and this unblocks the back, which can then rotate and take new angle with regard to the plan of sitting where we obtain the new sitting position. This is accomplished by the rear part of the seat (1) hanging on the side of the armchair (3) by means of the ellastic element (7), so that the back of the seat (2) rotates along the side of the armchair (3), around the axes (15), and by burdening the seat (1), elastic element (7) is deformed, which makes pressure on the upper part (14) of the stiff lever (13), which represents a brake, blocks the rotation of the stiff lever (13) around axis (15) that also does not enable the rotation of back (2) around axis (15). |
