Actuating mechanism for a spine support

The mechanism (1) has an actuating shaft (10) which actuates at least one actuating piece (20,30) and driven by a drive shaft (60) through bevel gears (40,50). The bevel gears convert the rotational angle of the driving shaft into the rotational angle of the actuating shaft, in which the actuating shaft rotational angle is greater than the driving shaft rotational angle.