Abstract: Folding knife apparatus includes a blade having a tang secured to a case or housing. Wedging action between the tang and the case locks the blade open and closed. The tang includes a longitudinally extending slot, and the case or housing includes a pin extending through the longitudinally extending slot. A spring is disposed in the slot and biases the blade against the pin to help lock the blade in place, particularly in the open, use position. Axial movement of the blade is required to unlock the blade from its open position in order to pivot the blade. A cam relationship exists between a portion of the tang and a portion of the case or housing to urge the blade to the closed position.