US Patent 8413338 Folding knife with safety and wedge lock

A folding knife includes a handle, an axle coupled to a first end of the handle, and a blade rotatably coupled to the axle. The blade includes a working portion and a tang, the blade having an open position in which the working portion extends from the handle and a closed position in which the working portion is substantially received within the handle. The folding knife further includes a lock having a locked position in which the lock prevents rotation of the blade and an unlocked position in which the lock permits rotation of the blade. The knife further includes a spring arm in the handle and a safety coupled to the handle, the safety having a first position in which the safety deflects the spring arm into the path of the lock to maintain the lock in the locked position and a second position in which the safety permits the lock to move from the locked position to the unlocked position.