Abstract: A folding knife comprising a handle transversely flanking a knife blade movable within a slot formed through the handle. A complementary fixed bushing and pivot hole on the handle and knife blade provide a positive lock for the extended knife blade, in conjunction with a spring-biased ball that is located within the bushing and which bears radially outward against the surfaces of the pivot hole. The knife blade is manually releasable from its extended position by application of manual pressure to the blade in a direction perpendicular to bushing axis. The spring-biased ball also acts in cooperation with a notch in the pivot hole to serve as a releasable detent for maintaining the knife blade in its folded position.

Abstract: A folding knife providing a safety lock mechanism that securely locks the blade in an open position. A bar spring in the handle is anchored at the rear handle end. Its opposite end is freely biased against the edge surfaces of the tang of a foldable blade. The bar spring includes a latch configuration complementary to a catch formed across the tang, which interfit when the blade is open. A transverse pushbutton serves to cam the free end of the bar spring from engagement with the blade when it is to be folded to a closed position.