a position in which it has no effect as shown in fig1 and a locked position in which the locking bar 48 engages in the grooves 47 in all of the supporting arms that engage in the cavity 28 a mechanism having two wheels 50 which are coupled by a belt 49 or in some other suitable manner as shown schematically in fig1 may be used to move the locking bar 48 between the position in which it has no effect and the locked position fig1 shows the locking bar 48 in the position in which it has no effect standing on the bottom 51 of the cavity 28 the rod is connected to the wheels 50 through two eccentric pins 52 such that it can rotate one of the wheels 50 is connected through an opening in the front face of the hollow body 2 to a control knob 53 in the internal area of the refrigerator rotation of the control knob 53 in the counter clockwise direction raises the locking bar 48 and pushes it to the left in the perspective shown in fig1 so that it engages in the grooves 47 in the supporting arms 33 the locked position is reached as soon as the locking bar 48 comes to rest on the bottom 51 again if only one of the cooled item supports is not positioned correctly so that its groove 47 is not exactly vertical the locking bar 48 cannot engage in the locked position and the control knob 53 returns to the illustrated position in which it has no effect on being released this immediately warns a user when the action of hooking in the cooled item.