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A deadlock, if it is cylinder operated, may be either single cylinder or double cylinder. A single cylinder deadlock will accept a key on one side of the lock, but is operated by a twist knob on the other side. Double cylinder locks will accept a key on both sides and therefore do not require (and often do not have) any twist knob. This ...
If the lockset has a single keyed side, it is called a "keyed, single-cylinder lockset"; if both sides are keyed, it is called a "keyed, double-cylinder lockset". In this aspect, the word "cylinder" refers to any type of keyed cylinder lock, rather than to the type of mechanism of the lockset.
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.
A crossbar for double doors employs the same principle, but, in most cases, must be manually set in place and removed due to its width being greater than both doors. A crossbar for a single jamb may be "captured" on the door by U-shaped bails, or anchored by a bolt on its inboard end and pivoted up and down into open cleats, making it a form of ...
The most common is the single-bitted, five-wafer configuration [3] most commonly found on desk drawers, cabinets, key switches, lockers, cash boxes and electrical panels. Some wafer tumbler locks use a stack of closely spaced wafers designed to fit a specific contour of a double-sided key and work on the principle of a carpenter's contour gauge.
The modern bored cylindrical lock was invented by the German-born engineer Walter Schlage [4] in 1923 [5], as an innovation on a patent filed in 1920 [6] for a lock whose installation required a face bore and surface rabbet, simplifying door preparation compared to a traditional mortise lock.