Abstract: A folding knife, including a handle, with at least two parts connected to form a cavity therebetween, and a blade having a sharpened edge and a tang. The blade is rotatable between an open position and a closed position. The blade defines a first plane inside the cavity. The tang includes a step protrusion and a rounded protrusion. A stop pin restricts movement of the blade in an opening direction. The folding knife also includes a locking member rotatable from a first position, allowing the blade to rotate, to a second position blocking rotation of the blade by engaging one of the tang's protrusions. The engagement of the locking member with the step protrusion of the tang locks the blade in its open position, and the engagement of the locking member with the rounded protrusion of the tang locks the blade in its closed position.

Abstract: A folding knife having a rotary blade, a handle and a thumb plate. The rotary blade includes a cutting edge, a non-cutting edge and a tip. The handle is provided with a pivot axis for the blade and is made of two parts connected to each other to form a cavity in which the blade is positioned when the knife is in its closed position. The thumb plate is attached to the non-cutting edge of the blade perpendicularly to the blade. The thumb plate is a flat prism with multiple side facets, two of the facets being elongated and tapering toward the tip of the blade. The flat prism is symmetric or asymmetric with respect to the blade.