Are Your Door Lock Cylinders Actually Safe
Door Locking Systems are a very important part of door security ^(http://securemydoor.co.uk/door-locks/). Normal lock cylinders are made up from a line of spring-loaded stacks which are called pin stacks. A single pin stack comprises of two different pins which are stacked one on top of the other: A key pin which sits on top of the key once inserted into the lock and then the driver pin which is spring loaded. So what happens when the correct key is used in the lock? Well, each and every key pin and driver pin in the series align along the shear line – this allows the cylinder to turn. So when the different length key pins are aligned at the top by inserting the correct key into the lock – the key pins and their coresponding driver pins for a straight line allowing the cylinder to be turned. Of course, when the incorrect key is inserted into the lock, the pins do not align and create a straight line thus preventing the cylinder from turning.
However, there is an easy way to get into these standard cylinder locks and this is called lock bumping. Lock bumping occurs when a special key is initially inserted into the keyhole once pin short of fully inserted. The bumping key is then “bumped” into the lock forcing it deeper into the keyhole. The specially designed teeth on the bumping key transmit a small impact force to all of the bottom key pins. These pins then transmit the bumping force onto the driver pins whilst leaving the key pins in place. These driver pins basically appear to jump from the key pins for just a fraction of a second – this movement pushes them higher than the shear line of the tumbler, at which poing they are then pushed normally back into place by the spring sitting them back ontop of the key pins. This seperation of the two pins lasts only a fraction of a second – but during the lock bumping process you just need to apply a light turning force whilst the impact is taking place and the lock cylinder will turn during the split second seperation of the key pins and driver pins alowing the lock to be opened.
Lock bumping takes place in a matter of seconds and the lock is opened. There is no damage to the lock cylinder. To protect against this you should invest in an anti-bump cylinder lock (also known as an anti-manipulation cylinder) and have it fitted by a professional – if you don’t, the door you think is secure can actually be accessed in a matter of seconds! An Anti-manipulation cylinder has ‘Passive’ bump resistance. If someone attempts to bump the cylinder the ‘double sprung’ pin tumbles will block entry without damaging the cylinder. This ensures that the potential intruder is kept out whilst ensuring legitimate key holders can always get in – a must for door security.
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Are Your Door Lock Cylinders Actually Safe By house | December 20, 2010
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