Knives with back lock

Back lock

— a lock using a locking plate, which looks like a kind of spring-loaded "rocker" mounted along the knife handle and able to swing around the transverse axis. When the knife is open, this plate rests with its front edge against the hook on the back of the blade, preventing it from closing; and to close the knife, you need to press on the back of the “rocker” protruding from the handle, releasing the plate from the hook. The pressing force is usually quite large, which minimizes the likelihood of disengaging the lock even with the tightest grip. In general, such locks turn out to be quite reliable, however, it is very difficult to close a knife with a “backlock” with one hand, and in many models it is impossible at all.