A second shear line could be cut on the opposite angle ( upper-left to lower-right ) . . . a different key that would only turn in the opposite direction after being inserted.
12.
As the key slides into the lock, the horizontal grooves on the blade align with the shear line of the inner and outer cylinder, allowing the cylinder or cam to rotate freely and the lock to open.
13.
This key can then turn back to start and be removed, but not overall counterclockwise because the shear line does not align with the side of the pin on the left side ( the key is not correct ).
14.
:: Yes, there's wind and convection and so forth and yet a stationary front can take several days to become a shear line ( when the sharp contrast ceases to exist and becomes more of a diffuse gradient ).
15.
:For example, the left diagram has the key ( K ) that pushes the pin ( ABC, with a spring beyond A ) up to the extent that the left edge of AB is at the shear line ( = = ).
16.
In the right diagram, the plug cannot turn clockwise ( shear line does not align on right edge of pin ) but can turn counterclockwise because doing so makes the plug push up on B, which is just pushing up A and the spring.
17.
:I wonder if a standard pin tumbler lock could do it by cutting the shear points ( the places where the key pins and driver pins meet ) on on an angle tilted " up or down " compared to the shear line instead of flat.
18.
Because the pin movements are highly elastic, the driver pins " jump " from the key pins for a fraction of a second, moving higher than the cylinder ( shear line of the tumbler ), then are pushed normally back by the spring to sit against the key pins once again.
19.
When the different length key pins are aligned at their tops by the insertion of the correspondingly cut key at their bases, the tops of the key pins and, consequently, the bases of the driver pins, form a shear line, so that the cylinder can be turned, rotating the key pins away from the driver pins.
20.
;Rake picks : Two types of rake pick, the double and triple peak, sometimes known as " bogota rakes " These picks, such as the common snake rake, are designed to " rake " pins by rapidly sliding the pick past all the pins, repeatedly, in order to bounce the pins until they reach the shear line.
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