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Multiplex Dial Padlock Combination Lock

2017-01-07 23:01  
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A combination lock is a type of padlock in which a sequence (permutation) of numbers or symbols is used to open the lock. The sequence may be entered using a single rotating dial which interacts with several discs orcams, by using a set of several rotating discs with inscribed numerals which directly interact with the locking mechanism, or through an electronic or mechanical keypadHere's an effective little combination lock that you can put together in one evening's time. To open the lock, simply dial in the correct combination on the three rotary or thumbwheel switches. With the correct combination entered, current flows through Rl into Ql's gate terminal, causing the SCR to latch in a conductive state. This sends a current through relay Kl, which responds by closing its contacts and actuating whatever load is attached. After opening the lock, twirl the dials of SI through S3 away from the correct combination so that nobody gets a look at it.The lock will remain open and your load will remain on because theSCR is latched on. To lock things up, it's only necessary to interrupt the flow of anode current through the SCR by pressing pushbutton S4.One of the simplest types of combination lock, often seen in low-security bicycle locks and in briefcases, uses several rotating discs with notches cut into them. The lock is secured by a pin with several teeth on it which hook into the rotating discs. When the notches in the discs align with the teeth on the pin, the lock can be opened.
 

Three-dial combination lock