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In 1778, Robert Barron invented the Double Acting Lever Lock that uses several levers instead of the previous two. The original locks only had two levers because the first levers used were so large that more than two would not have been practical for use in a normal wooden door. Only having two levers makes these locks incredibly easy to pick. Once advances in technology enable levers to become thinner, up to six would be used in one lock, thus greatly increasing security. New thin levers greatly improved the security of Lock, but unfortunately the cunningness of thieves moves with time as well, so Lock wasn't completely secure. In order for these locks to be totally secure, they must be manufactured perfectly. If bolt and lever have slightly round corners, they can be manipulated into a position that will force Lock open. Since few locks at time were manufactured perfectly, this left a gap where thieves could pick up lock by testing springs and manipulating them into notches on the bolt which would, with some applied pressure, cause the bolt to be release. This is why future generations of locks start to incorporate safety mechanisms into their production. This style of lock mechanism is still used in locks today, though with more advanced security and complex Lever systems developed by well - known lock companies such as Chubb.
Lock is made up of levers. Each Lever needs to be lifted to a specific height by key in order for the locking bolt to move. Typically, belly of lever is cut away into various depths to provide different combinations, or gate is cut in different location,s to provide differences. Lever will have pockets through which the bolt stump moves during unlocking. There has not always been universal agreement about which variants of basic design merit terms Lever lock or detainer lock or both. Some authors use the term detainer lock to refer specifically to variants where gates are open, rather than close. Lever Locks generally use bitted key. Some locks used in safes use double - bitted key, as do some door locks of the type often used in Southern and Eastern Europe.
Lock has 9 - tumblers in brass. At two 360 degree key - turn deadlocking occurs automatically, hook bolt reaches 21 mm in locked position. To complicate, sawing and breaking hook bolt is harden and steel. The lock is a mortise lock with cut out Standard SIS 81 73 83 = symmetric and SIS 81 73 81 = asymmetric, latch bolt is reversible and the forend is replaceable. The lock has a lever function. Lock is considered to be away - safe, which means that the key can be used from both inside and outside. Complies with requirements of Swedish Standard SS 3522, edition 4, class 3 TR 29.
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