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A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.
The same physical principles are involved in lock bumping, but the snap gun automates the transfer-of-energy process. A correctly applied snap gun can open a lock very quickly compared to traditional lock picking, but the sharp impact is more likely to damage the lock mechanism than raking, which mimics normal key movements.
Rotary assemblies [2] are commonly used where formations are predictable and the rig economics are an issue. In such an assembly the weight of the drill collars gives the BHA the tendency to sag or flex to the low side of the hole, collar stiffness length and stabiliser diameter and placement are engineered as a means of controlling the flex of the BHA.
The Chubb detector lock is a variation of the lever lock which was designed to detect and prevent picking attempts. Lever locks can be drilled, but usually a template or stencil is required to mark the drilling point, as the lock mechanism is commonly mortised into the door and so it is harder to determine the point at which to drill.
Safe-drilling with a drill rig. Some safes are susceptible to compromise by drilling. Manufacturers publish tightly-guarded drill-point diagrams for locksmiths for specific models. Drilling is an aid in bypassing the locking mechanism, as well as gaining more information about it in order to defeat it.
The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.
The same effect can be created by turning a torque tool in the lock until the end cap pops off. [4] After this, cheap plastic locks can be turned by hand, pulled out with pliers, or deformed by heating, causing the lock to open, or completely fall apart. More expensive disc tumbler locks use metal parts that can defeat this technique or make it ...
The lock is not visibly damaged, although the force of the bump can leave an indentation on the front of the cylinder. Certain clicking and vibrating tools designed for bumping can also be used. These allow for rapid repetition of bumping. Though some locks have advertised "bump proof" features, only a rare few key-pin locks cannot be bumped.