n of pin, which remains permanently in the rotatable bar- rel. When the key is out of the lock, the springs press the upper half of the pin down into the barrel, pre- venting it from turning and throwing the bolt. When the key is inserted, the pins are gradually raised until all of them in the… … KEY FULLY INSERTED RAISING PINS TO UNLOCKED pins can be figured by taking the power of 10 indicated EGYPTIAN LOCK, SHOWING PINS FREEING BOLT. POSITION. by the number of pins; in other words, the number of pins would be the exponent of the figure 10. In prac- pins in the key are all of the same…
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