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A key exchange block may only hold and release keys and may not have a bolt to interlock process equipment, or may be part of the interlock of a particular machine or device. This is a transfer block, part of a trapped-key interlock system. It does not have a bolt to stop operation of a device, but holds and releases other keys.
Once all keys are returned, then the operator will be allowed to take out the original key from the beginning. 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 ...
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.
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.
The Ternkey System ("Token Exchange using Random Numbers" system) is a hybrid between conventional token working and internet technology. Conventional "trapped key" pin tumbler locks (held in fixed position by solenoids ) are mounted in key-release units set up at each end of controlled single line.
Computer-based interlocking is railway signal interlocking implemented with computers, rather than using older technologies such as relays or mechanics. General
A 12-foot Burmese python that slithered into a gated community in Florida Thursday night. Residents, who were enjoying BBQ before the unwanted guest arrived, called 911...but ended up taking ...
Python provides a low-level mutex mechanism with a Lock class from the threading module. [19] The ISO/IEC Fortran standard (ISO/IEC 1539-1:2010) provides the lock_type derived type in the intrinsic module iso_fortran_env and the lock/unlock statements since Fortran 2008. [20] Ruby provides a low-level mutex object and no keyword. [21]