All Old Bear models have the same locking mechanism. The locking mechanism of the Old Bear knives consists of a rotating plate. invented in the 1980s by Arduino Todesco from Maniago, who patented it in 1987 and are actively involved in the Old Bear project. The lock consists of a fixed ring around the top of the handle, near the pivot point of the blade. The ring has a longitudinal opening, to open and close the blade, and an elongated recess in the transverse direction, through which the ridge of a semi-circular metal plate protrudes upwards. That plate can rotate. In the lower position of the cam, the plate lies behind the opened blade or in front of the closed blade. In both cases, the movement of the blade is blocked. When the cam is turned up, the blade is released, and can be opened or closed.