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padlock found at Birka .]] A padlock is a simple type of detachable Lock , with a Hinge d or sliding Shackle designed to pass through a ring or staple on a door, chest, etc. Most modern padlocks do not require a key to be closed, only to be opened. In Victorian times, English Locksmiths made giant padlocks which they challenged all-comers to open (or "pick") in order to claim a prize. This was supposed to demonstrate how secure their devices were to the public. The type of padlock made from layers of laminated steel was invented by Harry Soref in 1919 . COMBINATION LOCKS ''Main article: Combination Lock '' Combination padlocks do not use keys. Instead, the lock opens when its wheels are lined up correctly to display the correct combination. Often the lock is re-programmable by holding the shackle in a special position while turning the wheels, allowing the number to be changed if necessary. It should be noted that - with patience - every mechanical combination padlock can be cracked without any special skill, unlike the key version. USES Padlocks have a wide variety of uses. In some schools, workplaces, etc. they may be used to keep Lockers secure. Very small padlocks can be attached to Suitcases when travelling, to prevent casual thieves (and, possibly, airport staff and baggage handlers) from opening the case. Padlocks are also used as part of the security measures on commercial and industrial sites, particularly for outdoor areas. inventor Harry Soref Soref founded the Master Lock Company in 1921 and patented an improved padlock. In April 1924, he received a patent (U.S #1,490,987) for his new lock casing. Soref made a padlock that was both strong and chea using a case constructed out of layers of metal, like the doors of a bank vault. He designed his padlock using laminated steel. |
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