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Frame Lcok / Integral Liner Lock is actually a derivative and upgrade of the Liner Lock. The principle of the frame lock is to use a part of the handle as a lining (separated from the handle to do tempered processing tail groove), the blade completely open, the lining rebound against the blade; When the lining is flicked to the other side, the blade is released to complete the closing action. Combined with the frame lock analysis diagram can clearly understand its principle.
Frame locks are reliable, secure and sturdy, and are also suitable for one-handed operation. Frame locks are often matched with medium to high end steel to make excellent jackknives.
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Lock Back, one of the oldest forms of locking. Its locking principle is to use a spring load of the gate, the top of the gate has teeth, falling into the groove of the blade shank core part, and pressure the spring. There is a protrusion on the back of the handle to release the lock. This explanation may not be clear to many people, but it is more straightforward to use a picture to analyze it. The security and sturdiness of the back lock is very reliable, it should be noted that it is not convenient to open and close, usually need two hands to complete, after skilled can realize one hand to close the blade, but should be very careful. A backlock type jackknife is usually suitable for use as a tool knife. 
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Axis of the Lock. The principle of the shaft lock is that when the symmetrical button at the front of the handle is pushed back, the blade is completely released, and the blade can be opened or closed by adjusting the Angle appropriately. The process uses a spring mechanism. When the blade is fully open, an omega style spring is used to hold the blade against the blade. The spring is a short cylindrical stick structure perpendicular to the blade. It is easier to understand the analytical diagram combined with the shaft lock. The invention of shaft lock greatly facilitates left-handed, left-handed and right-handed universal, one-handed operation is quick and easy. Its security has also been tested by time, shaft lock is also one of the safest locking methods.
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In addition to the above, there are many jackknife locking methods, such as topline lock, ball lock and so on. lock the cent that does not have what actor bad, this basically sees many aspects such as material, design, craft.
