Lift-up door opening device

Device for lift-up opening of a door of a kitchen, bathroom, living area furniture item, comprising a container that is configured to be attached to one side of a frame of the furniture item, containing in an interior of the container a mechanism that acts, by means of an arm, articulated to the container around a fulcrum pin, directly or indirectly on the door, wherein the mechanism comprises an eccentric pin, a plate, and at least one spring, the arm carries the eccentric pin housed in an opening with curved profile, formed in the container, and configured to engage with a cam profile of the plate slidably housed in the container, under an action of the at least one spring acting between the container and the plate in a direction opposite to the cam profile, the cam profile and the action of the at least one spring balancing a weight of the door in each position during opening and closure, wherein the plate is in a shape of a rectangular frame, having a large window, delimited by two horizontal sides slidably housed in corresponding longitudinal guides of the container, and by two vertical sides, wherein one of the two vertical sides has a variable thickness, in such a way as to determine internally the cam profile on one side, the cam profile delimiting the window.