Patent ID: 8398127

Claim:
An opening and closing device for lids, said device comprising: a case adapted to be closed by a lid; a roto-translating pin extending outwardly from the case and having a head at an end for engaging the lid; an ejection spring contained in and biasing the roto-translating pin; a heart-shaped cam positioned parallel to the roto-translating pin and having a closed track that includes at least two grooves parallel and connecting with each other; and a rocker rotatable about a center axis thereof between the cam and the roto-translating pin, wherein the rocker includes a tappet located at an end of the rocker and slidable along at least the two parallel grooves of the closed track in said heart-shaped cam; and a semi-arched fork at another end opposite to said end of the rocker and engaged with the roto-translating pin, wherein the roto-translating pin is rotatable about a rotation axis thereof and the rotation axis of the roto-translating pin is orthogonal to the center axis of the rocker.