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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.
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 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.
The installation of a mortise lock can be undertaken by an average homeowner with a working knowledge of basic woodworking tools and methods. Many installation specialists such as carpenters use a dedicated mortising jig which makes precise cutting of the pocket a simple operation, but the subsequent installation of the external trim can still ...
Pin-to-pin compatible devices share an assignment of functions to pins, but may have differing electrical characteristics (supply voltages, or oscillator frequencies) or thermal characteristics (TDPs, reflow curves, or temperature tolerances).
The royal family might be known for giving gag gifts, but it would be almost impossible to top the extremely awkward present that Princess Diana gave to her son Prince William one year—even Kate ...
Latest news: Luigi Mangione, suspect in Brian Thompson slaying, retains high-profile NY attorney Fort Eisenhower receives all-clear. It then gave the all-clear around 10:30 a.m. "Fort Eisenhower ...
Click Install Now. 6. Restart your computer to finish the installation. Uninstall Desktop Gold • Uninstall a program on Windows 7 and 8.