Device for fast displacement of the position in height of an internal shelf resting surface of an electrical household appliance, such as a refrigerator or freezer

An appliance, comprising:

• a cell having supporting guides, on side walls of the cell, arranged at predetermined distances from a bottom of the cell;
• at least one shelf;
• and
• at least a device for positioning said shelf at different heights within said cell of said appliance, said device comprising:
• a coupling element having opposite a first side and a second side, said first side slidably engaged with one of the supporting guides in the cell;
• an adjusting element coupled to the second side of said coupling element while being moveable vertically with respect to the coupling element, said adjusting element holding a respective one of lateral sides of the shelf;
• and
• at least a pin which is slidably mounted inside an elongated slot located on the second side of the coupling element and extends outward from said slot;
• wherein
• said adjusting element has a closed retaining groove having a plurality of blocking structures corresponding to two fixed vertical positions between the adjusting element and the coupling element;
• and
• said pin extends from the slot into said retaining groove and is moveable, in a predefined path inside the retaining groove until said pin is retained by one of the blocking structures, thereby displacing the adjusting element among the two fixed vertical positions of the adjusting element and the coupling element and thereby facilitating vertical movement of the shelf to a plurality of heights within the cell without having to move the coupling element to the other supporting guides,
• wherein, when said pin is retained by any one of the blocking structures, said pin is only dislodgeable from said blocking structure by an upward force exerted by a user on the shelf.