Rules When Purchasing A Combination Lock

A combination lock is the type of lock where sequences of numbers or symbols are used to open a lock rather than a key. Often the sequence of number or symbols used is a permutation rather than a real combination and these may be entered either by entering them using a single rotation dial (which interacts with several discs or cams) or by a set of several rotating discs with inscribed numerals or symbols (which directly interact with the locking mechanism itself).

Firstly we will look at multiple dial locks and which is one of the simplest type of combination locks. These are often used for low security situations such as a bicycle lock which has several rotating discs with notches cut into them. The lock is secured by a pin that has several teeth on it which then hook into the discs that rotate around it. Thus when the discs and notches are aligned with the teeth of the pin the lock can open. Unfortunately the disadvantage of this type of lock is that it is considered to be one of the least secure types of combination locks available today.

The opening of such a lock can be done without the combination it all depends on the slight irregularities which will occur during the machining of the locks parts. So unless the lock has been precisely machines (the pin pulled outward) then you are likely to find that one of the teeth will pull more strongly than others on its corresponding disc. Once this disc is rotated and a slight click can be heard this tells the person that the tooth has become placed in its correct notch and thus this procedure can be repeated with the other remaining discs which will result in the lock being opened (a correct combination on such a lock can be found in a very short period of time).

Next we come on to the single-dial locks, these are normally found on padlocks or safes and will often just use a single dial which then interacts with several parallel discs or cams. Such locks are normally opened by the rotation of the dial clockwise to the first numeral and then counter clockwise to the second and so on until in this alternating fashion until the last numeral has been reached. Typically the cams inside the lock have an indentation or notch on them and it is only when the correct combination has been entered and the notches or indentations have become aligned that the latch will be able to fit into them and the lock can be opened.

Certainly these type of combination locks are generally more secure that the multiple dial locks and yet they do have some weaknesses as well. Certainly early combination padlocks which were made by Master Lock could be opened by pulling on the shackle and turning the dial until it stopped and thus each numeral involved in the locks combination could be revealed.

However, the more recent models of the Master padlock now come with 40-position dial and this has a weakness where it gives away the last numeral in the locks combination and the first two numerals of the lock have a mathematical relationship to this one. Because of this weakness it reduces the possible number of combinations a person can try to open it from 64,000 to a mere 100 instead, which results in the lock being opened in a very short time.

Unfortunately an inexpensive padlock is not the solution either as these are often susceptible to them being shimmed, which is often used to release the shackle without the actual combination being entered.

There are many other designs available and many doors lock now use a combination lock system which requires the user to enter a numeric sequence on to a keypad for them to gain entry. However, such locks usually require the use of electronic circuitry to be effective. But the one main advantage of such a system as this is that if it is used for the door of a large office then each member of staff can be provided with the number that they will need to gain access and thus eliminate the use of supplying them with keys which could be either lost or stolen.

The only real disadvantage of this type of lock is that if the code number for entry is discovered by someone who is not employed by the company, or the number is not changed regularly, then access to the property can be gained by an intruder (such as a burglar).

RFID Door Lock

An RFID (radio frequency identification) door lock? What's that? Well, it's another alternative to the old key-in-lock opening mechanism that most houses come with. Instead of opening the door with your thumb (as with fringerprint locks) or with a numerical code (as with keypad door locks), you use a special entry card.

With the MyKey 2300 (shown here), you press the button in the center, and then you wave wallet, keychain, cellphone, or any place you've stuck an authorized MyKey 2300 RFID card, and the door unlocks. To lock it again, you simply press the button in the center. If you forget your RFID card, you can still get in via a keypad that's hidden above the button.

As far as home security goes, the company promises that, unlike with common metal keyholes, their lock can't be picked by would-be thieves. Also if you lose a card or someone steals one, you can reprogram the lock to deny that card.

The MyKey 2300 will cost you $300.

http://www.mykey2300.com/

Source: Home Security News

Recommend Sites

self improvement tip

Our Success Partnership is a self improvement website, ezine, and blog that will help you lead a wealthy, healthy and successful life.


dreamweaver template

Dreamweaver Tutorials & Training Videos, Step by Step.


article directory

Online article directory, containing free reprint articles on all topics.


Bifocal reading glasses

Find out more information about all types of reading glasses.


Funny Quotes

Your source for famous quotes and quotations from thousands of famous people.


Furnace Air Filters

Here's a review of the popular furnace air filters...


DUI Attorney Search | DUI Lawyer

Visit our Dui Attorney Search website. Fill out a free case evaluation so one of our Dui Attorneys can assess your case and provide you with some feedback. Don't hesitate contact a Dui lawyer today!


Weight Loss Diet Pills

Weight loss diet plan that really works. Tips for losing weight fast. Promotional offer from clinically proven weight loss diets.


Prom Dresses 2007, Alfred Dunner Clothing, Homecoming Dress 2006 Collection

Prom Dresses 2007, Alfred Dunner Clothing, Homecoming Dress 2006 Collection, Jessica McClintock Prom Dresses, Special Occasion Dresses, Holiday Dress, Cocktail Dresses - we have all the dress designs you need for Prom, Homecoming, Cocktail Parties, H


NO PIN cheap international phone calls-YesPinLess

Pinless long distance phone service at discounted rates from your cell-home-office. No hidden, maintenance, or connection charges. Included FREE: Speed Dial, My Own 800 Number, & much more...


craigslist poster

craigslist posting tool


Thiet Ke website, Quang ba website, thiet ke web,quang ba web, quang cao thuong hieu , SEO

thiet ke web thiet ke website quang ba web quang ba website quang cao thuong hieu thiet ke web dong thiet ke web tinh thiet ke web doc dao quang ba web hieu qua thiet ke thuong mai dien tu web thuong mai web thuong mai dien tu


clitoris

Pick up lines.