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Testimonials
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Very professional guys repaired my backyard gates very quickly, I also offered them to check my all door locks and they did a fine job...
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Last week, I accidentally locked my doggy inside my own car - I also left my car keys inside. I was unable to understand what to do....
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I had a problem in my deadbolt of entry door and I decided to call a locksmith who can finish the job very quickly in morning time because I have to go to office at 8 am and I don't want to take any risk ...
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| Types of locks at City Locksmith in Tucson AZ |
Types of locks
Locks may be entirely mechanical, or electromechanical. They may be operated by turning some form of removable key, by keying or dialling in a combination which directly or via electromechanical means operates the lock, with some form of magnetic or other card reader, or by moving a part on a safety lock intended to prevent accidental operation rather than to prevent unauthorized access.
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History of locks
Securing one’s property has long been a concern of people throughout the world. Beyond hiding the objects or constantly guarding them the most frequently used option is to secure them with a device. Early solutions included knots to either detect, like the Thief knot, or hamper, like the Gordian Knot.
Wooden locks and keys were in use as early as 4,000 years ago in Assyria [1]. The first known lock with a key is a pin lock. The lock is strung on a rope hanging out of a hole in a door. A cylinder of wood with a hole drilled through its axis is the key, the length of the cylinder being the critical factor. The key is inserted into the hole and the bolt is pushed the correct distance. To lock the door the rope was pulled to extract the key cylinder, simultaneously pulling the bolt closed. This type of lock is still in use in certain parts of the world. A disadvantage of this lock is that a vandal can push the rope into the hole — an ancient equivalent of putting glue into a lock. Early improvements in pin locks included increasing the number of pins to increase security, and changing the orientation of the pins to allow the key to provide the unlocking force instead of a rope, thus establishing the principles of the modern pin tumbler lock.
Next was developed a warded lock that is still used in modern times when the security required is not high and cost is a significant factor. It is the first lock design to have a key recognizable to a modern western person. Lock puzzles were used to obscure the locking mechanism or even provide a non-functioning lock for the thief to waste time on.
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