BiLock EX: Difference between revisions

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== Principles of operation ==
== Principles of operation ==


{{imbox|text=ASSA literature numbers pins and key bitting positions from tip (back) to bow (front). Lockwiki uses the traditional terms and positions to avoid confusion.}}
The BiLock uses two rows of six pin-tumbler pins and five sidebar [[Side pin|finger pins]]. To open the lock, all pin-tumblers properly raised to a height that allows the side bar legs to retract into small holes located in the key pins.  Every pin has a second, shallow hole drilled in it. This hole is deep enough to allow the pin to set under sidebar pressure but too shallow to allow the sidebar to fully retract.


The 6000 uses six pin-tumbler pins and five sidebar [[Side pin|finger pins]]. To open the lock, all pin-tumblers must be aligned at the [[shear line]] and all finger pins must be properly aligned with the sidebar legs. Balanced pin stacks are used to resist attack from [[comb pick]]s as well as reduces wear on the springs. Driver pins come in four sizes and use a modified spool design which is combined with counter-milling in the plug chambers to provide high pick resistance. There are nine depths for pin-tumblers, allowing for 531,441 (9<sup>6</sup>) theoretical key [[differs]] for the pin-tumbler portion of the lock. The [[MACS]] for this lock is five depths, giving the 6000 around 160,000 real key differs. [[Master keying]] is available using traditional pin-tumbler master pins available in six sizes.
BiLocks are unique because they contain no driver/top pins and there the lock has no traditional [[shear line]]. There are ? depths for pin-tumblers, allowing for ? theoretical key [[differs]] for each pin stack. The [[MACS]] for this lock is ? depths, giving the ? around ? real key differs. [[Master keying]] is available by using pins with multiple sidebar holes.


Unlike many other sidebar locks, the Twin 6000 finger pins are identical. Cuts are made on the sidebar directly and finger pins must be raised to match these positions. All finger pins use serrations above and below the true gate to provide manipulation resistance. Rekeying of the sidebar portion of the lock is only possibly when the sidebar is physically replaced or flipped upside-down. This interaction between finger pins and sidebar gates frustrates traditional [[decoding]] attacks that attempt to measure the range of movement of the finger pins. There are five depths available for finger pins, givin the Twin 3,125 theoretical sidebar differs (5<sup>5</sup>). There are 2,800 real sidebar differs, using 1400 sidebars that can be flipped in either orientation. Keys are stamped  with a five digit indirect sidebar bitting code.
The BiLock EG also has what is traditionally known as an [[interactive]] element in the key that was implemented to add an extra layer of security and extend the original patent of the lock.  BiLock refers to this element as a "trigger" which is held between the two blades by the plastic key head. In its rest position the Trigger protrudes through a small opening in the key blade. As the key enters the keyway, the bottom of the keyway channel forces the front of the trigger upward into a lift pin. When the lift pin is raised, it drags a blocking bar up and out of the way of the right side bar, allowing it to retract.


To provide resistance against [[destructive entry]], the 6000 uses hardened steel pins in the front of the plug and near the sidebar and third and fourth pin-stacks. In addition, driver pins are made of stainless steel to frustrate drilling of the pin stacks.
To provide resistance against [[destructive entry]], the 6000 uses ....


<div align="center"><gallery>
<div align="center"><gallery>
File:ASSA_Twin_V10_sidebar.jpg|The Twin 6000 sidebar.
File:BiLock_sidebar.jpg|BiLock Sidebar.
File:ASSA_Twin_sidebar_pin.jpg|Finger pins used with the sidebar.
File:ASSA_Twin_V10_counter_milling.jpg|Counter milling in the plug chambers.
</gallery></div>
</gallery></div>


'''Notes'''
'''Notes'''
* The pin-tumbler bitting code is referred to as the ''system code'', and the sidebar bitting code as the ''sidebar code''.
*
* [[Security pin]] design is based on a 1942 patent by Ralph Paul Crousore.<ref>[http://www.google.com/patents?id=L25uAAAAEBAJ US #2,283,489]. ''Pin and Cylinder Lock''.</ref><ref>{{Ref pulford}}</ref>
*  


== Disassembly instructions ==
== Disassembly instructions ==

Revision as of 02:58, 11 May 2010

BiLock NG

BiLock NG
File:BiLockNG.jpg
Name BiLock NG
Manufacturer BiLock
Lock Type Cylinder
Lock Design Pin-tumbler, Sidebar
Year(s) Produced Mid 1980s-present[1]
Patent US 6,681,609
Related Locks
[]


The BiLock EG (or BiLock New Generation) is a UL 437-rated pin-tumbler lock made by BiLock. All BiLock models include two rows of pins and an associated sidebar for each row. The key is U-shaped to simultaneously register both rows of pins. BiLock keys are first cut, then folded to create their classic U-shape.


Principles of operation

The BiLock uses two rows of six pin-tumbler pins and five sidebar finger pins. To open the lock, all pin-tumblers properly raised to a height that allows the side bar legs to retract into small holes located in the key pins. Every pin has a second, shallow hole drilled in it. This hole is deep enough to allow the pin to set under sidebar pressure but too shallow to allow the sidebar to fully retract.

BiLocks are unique because they contain no driver/top pins and there the lock has no traditional shear line. There are ? depths for pin-tumblers, allowing for ? theoretical key differs for each pin stack. The MACS for this lock is ? depths, giving the ? around ? real key differs. Master keying is available by using pins with multiple sidebar holes.

The BiLock EG also has what is traditionally known as an interactive element in the key that was implemented to add an extra layer of security and extend the original patent of the lock. BiLock refers to this element as a "trigger" which is held between the two blades by the plastic key head. In its rest position the Trigger protrudes through a small opening in the key blade. As the key enters the keyway, the bottom of the keyway channel forces the front of the trigger upward into a lift pin. When the lift pin is raised, it drags a blocking bar up and out of the way of the right side bar, allowing it to retract.

To provide resistance against destructive entry, the 6000 uses ....

  • BiLock sidebar.jpg

    BiLock Sidebar.

Notes

Disassembly instructions

The 6000 is disassembled in the same way as a traditional pin-tumbler cylinder. The sidebar does not cause too many problems when the plug is removed. When the key is removed from the exposed plug the finger pins will be forced out by spring pressure.

  1. Remove the cam or C-clip.
  2. Insert the key and turn the plug 45-90 degrees.
  3. Withdraw the plug from the cylinder. (A plug follower is recommended)

OR

  1. Remove the chamber casings and take out each pin-stack individually
  2. Remove the cam or C-clip.
  3. Withdraw the plug from the cylinder.


Vulnerabilities

The 6000 system may be vulnerable to one or more of the following:

Notes

  • Bumping is possible given a bump key with the correct sidebar bitting.

Gallery

  • Pins and springs used in the 6000 system.

  • Comparison of a "blank" and cut sidebar.

References

  1. ↑ BiLock: About Us

See also

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