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The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.
The rolltop desk was the mainstay of the small or medium-sized office at the end of the 19th century and the beginning of the 20th. Because it was produced in vast numbers and at varying levels of quality, the rolltop desk is popular in the antique market. It is usually expensive especially if the wood used is expensive.
By the early 1900s, the firm was known as the 'Cutler Desk Co.' In 1930 it was taken over by the Sikes Chair Co., also of Buffalo. [1] The US Patent Office issued a patent for the first American-made rolltop desk to Abner Cutler of Buffalo, NY in 1882. [2] Similar desks had been seen in the United States and Europe before Cutler's patent.
Many combination locks have three wheels, but the lock may be equipped with additional wheels, each with a drive pin and fly, in a similar manner. The number of wheels in the mechanism determines the number of specific dial positions that must be entered to open the lock, so a three-sequence combination is required for a three-wheel lock.
The bitting of a key is the physical arrangement of the bit of the key that engage with the locking mechanism. The bitting instructs a locksmith how to cut a certain key, to replace a lost key or make an additional copy. Blade The segment of a key which enters the keyway of a lock and has key cuts machined into it. On a bit key the blade is ...
A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.