Multiple Bolts as Security Devices

Abstract

The purpose of this study is to introduce the use of multiple bolts as security or safety devices in our daily life. Firstly, the classification and advantages of mechanical locks were introduced. This was followed by the description of the definitions and the development of mortise locks. Then, the multiple bolts locks were decomposed into four sub-parts according to their different functions, including the latch bolt lock, the dead bolt lock, the dead-latch bolt lock, and the connecting mechanism. The four sub-parts were further analyzed with reference to their structural characteristics as well as design requirements and constraints. The use of multiple bolts in locks in ancient and modern times was then compared. It was found that although the technology in lock mechanism has improved with time, the basic design methods, however, have been used extensively in new and improved devices.