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This is a trapped-key interlock on the door of an electrical switchgear cabinet. It is attached with one-way security screws to discourage casual removal, which would defeat the interlock scheme. Trapped-key interlocking utilizes locks and keys for sequential control of equipment and machinery to ensure safe operation. Trapped-key interlocks ...
The key will not turn unless the remaining keys are put back in place. Trapped key interlock transfer block. Another example is an electric kiln. To prevent access to the inside of an electric kiln, a trapped key system may be used to interlock a disconnecting switch and the kiln door. While the switch is turned on, the key is held by the ...
Groundframe, with the two rightmost levers locked by Annett's key. In British, Australian, French, and Swiss railway signalling, an Annett's key is a form of trapped-key interlocking that locks levers or other items of signalling apparatus, thereby serving as a portable form of interlocking.
A key retainer device (KRD) is a small metal unit that is wall or door mounted, usually designed for the interchangeable core that retains one key (Key A) while the second key (Key B) is used for authorized purposes. When the key in use (Key B) is returned into the key retainer, the key held captive (Key A) is turned and then can be released.
An interlocking system is designed so that it is impossible to display a signal to proceed unless the route to be used is proven safe. Interlocking is a safety measure designed to prevent signals and points/switches from being changed in an improper sequence. For example, interlocking would prevent a signal from being changed to indicate a ...
A magnetic keyed lock or magnetic-coded lock is a locking mechanism whereby the key utilizes magnets as part of the locking and unlocking mechanism. Magnetic-coded locks encompass knob locks, cylinder locks , lever locks , and deadbolt locks as well as applications in other security devices.
There are three certainties in life: death, taxes, and year-end lists. So with each go-round, I have a harder time writing these intros — gazing down at the meticulously formatted blurbs and ...
WESTLOCK Interlocking is a Computer-based interlocking (CBI) product now sold and maintained by Siemens Mobility Limited, following their purchase of Westinghouse Rail Systems. Westlock builds on many of the features that made SSI popular in the United Kingdom. This includes re-use of SSI's programming language and its track-side hardware.