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Lock Bumping :: OUR LOCKSMITH 283-4815
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Lock Bumping

Lock Bumping

Lock Bumping History

Lock Bumping, An US license first appears about 1928 called rapping later know as bumping a lock.   Around the 1970s, locksmiths in Denmark shared a technique for thumping on a lock cylinder when applying delicate tension to the back of the lock plug. When the pins would hop within the cylinder, the plug would have the chance to move out freely, hence enabling Us disassemble the lock quickly.  The use of a bump key was not introduced until some time later on and was first acknowledged as a potential protection issue around 2002– 2003 by K. Noch who brought it to the spotlight of the German media.  After further study of the procedure, a document was outlined in 2005 by  Wels &  Gonggrijp of The Open Organization Of Lock pickers  revealing the system and its applicability. A patent of invention is present for a lock device mimicking the equivalent concept as the bump key from 1926– 1928.

The technique then attracted more popular awareness in 2005 when a Dutch TV program, Nova, broadcast a story about the technique. After the method received further public notice from TOOOL presentations at safety symposium discuses, representatives of TOOOL and a Dutch consumer group, Dutch Consumentenbond, studied the capability of the technique on 70 different lock designs and with experienced and untrained users in a 2006 study.

At the same time, Marc Tobias, an American security professional, started to talk openly in the United States regarding the technique and its possible protection threats. In 2006, he released 2 more Lock Bumping white papers regarding the technique and its possible legal complexities. Lock Bumping hammer

Lock Bumping


When the correct key is put in, the spaces in between the key pins  and driver pins  line up with the ledge of the plug, called the shear line .
A pin tumbler lock is composed of a series of spring-loaded stacks called pin stacks. Every pin stack is made up of 2 pins in which are stacked on top of each other: the key pin, which contacts the key when it is inserted, and the driver pin, which is spring driven. Whenever the different length key pins are lined up at their tops by the interpolation of the correspondingly cut key at their bases, the tops of the key pins and, as a result, the bases of the driver pins, form a straight line, to ensure the cylinder can be turned, rotating the key pins away from the driver pins. When no key or the wrong key is in the lock, pin misalignment prohibits the cylinder from rotating.


When locksmiths are bumping or (Lock Bumping) a lock, the key is at first put in into the key way one notch (pin) short of complete insertion. Bumping the key inside pushes it deeper into the key way. The specifically designed teeth of the bump key send a slight impact force to all of the of the bottom pins in the lock. The key pins transmit this force to the driver pins; the key pins stay in place. [8] This physics activity can be visualized by examining the same effect on the desktop toy: Newton’s Cradle. Locksmith are aware because the pin movements are highly flexible, the driver pins “jump” from the key pins for a split second, moving more than the cylinder (shear line of the tumbler), then are driven normally back by the spring to sit adjacent the key pins once again. Although this separation only lasts a split second, if a light rotational pressure is continually applied to the key during the weak impact, the cylinder will turn during the short separation time of the key and driver pins, and the lock may be unblocked while the driver pins are elevated above the key way. Locksmith use Lock bumping because it takes only a second to unlock the lock. The lock is invisibly damaged, although the pressure of the bump can leave an impression on the front of the cylinder. Certain clicking and vibrating tools devised for bumping can also be used. These allow for quick repeating of bumping across locks that have recently advertised “bump proof” features. Only a rare few key-pin locks can not be bumped by most locksmiths.

A different tool with a similar principle of operation WE USE is a locksmith pick gun.