（外文电子版资料）Opening Simplex Locks.docVIP

Simplex 5-button combination locks (*Hobbit*s in-depth evaluation) This deals with the Simplex or Unican 5-button all-mechanical combination locks. They are usually used in a variety of secure but high-traffic applications, and come in a number of flavors: dead bolt, slam latch, lock switches for alarms, buttons in a circle or a vertical line, etc. The internal locking works are the same across all of these. Herein will be described the mechanical workings and a method of defeating the lock that falls out by logical inference and observations from playing with it. The internals Caveat: If this seems unclear at first, it is because the absolutely best way to understand the inner mysteries is to take a Simplex lock apart and study it. It is highly recommended that the reader obtain and disassemble one of the units while studying this; otherwise the following may be confusing. The locking mechanism box is swaged together at each end, but it is trivial to open up without destroying it. To set a lock up for study, remove the back, leaving the front plate held on by its Jesus clip. Put a spare thumb turn down over the shaft so you have something to grab. Take care not to lose the button connecting pins; they drop out. In the round configuration, the buttons talk via bent bars in the faceplate to the same vertical column as the straight ones. Thus all buttons henceforth shall be referred to as if they were in a straight vertical row, numbered 1 to 5 reading downward. The actual locking mechanism inside is a small metal box, about 3 inches high and .75 x .75 inch across the base. It contains five tumblers, one corresponding to each button, a common shift bar, and a couple of cams to handle reset and unlocking. The user dials the combination and turns the handle to the right to open the lock, or to the left to reset any dialed digits if he made a typo. If the proper combination has not been dialed yet, the shaft will not turn to the right. Setting a combination shall be desc