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William Robert Sykes (1840–1917) was a British engineer from London, known for his work in railway signalling and other safety devices.He is noted for the invention of the Sykes ‘Lock and block’ interlocking system of points and signals.
Plates that were punched from sheet metal were stacked and assembled. Holes that were formed in the middle of the plates made room to accommodate the locking mechanism. The entire stack of plates, loaded with the lock parts in it, was riveted together. This padlock was popular for its low cost and impact-resistant laminated plate design.
A dual custody locking system is one where two different keys, generally given to different people, are required to open the lock. These are often used in safe deposit boxes. [5] Face plate A metal plate on the lockset itself (on the door, not the jamb) is called a face plate. False gate
Like the manual block systems outlined above, automatic systems divide the route into fixed blocks. At the end of each block, a set of signals is installed, along with a track-side sensor. When a train passes the sensor, the signals are triggered to display the "block occupied" aspect on the signals at either end of that block.
A metal doorframe with a strike plate built in: in other doors this would be a metal strikeplate in a wooden doorframe. The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions. Door ...
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Whatever the choice of locking system, fire safety is an important consideration. [2] Other variations and improvements on the electromagnetic locks have been developed. The most remarkable is the shear lock, where the armature does not directly pull off the face, but the load is instead in shear, like a mechanical stop.
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