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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. Manufacturers of trapped-key interlock devices provide application guides showing typical interlock problems and recommended arrangements.
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 ...
The 1A2 Key Telephone System is a business telephone system developed and distributed by the Western Electric Company for the Bell System. The 1A2 Key Telephone System is a modular system that provided flexible solutions for a variety of telephone service requirements. It provides multiple users with control over multiple telephone lines ...
By 1900, 54 electro-pneumatic interlocking plants, controlling a total of 1,864 interlocking levers, were in use on 13 North American railroads. This type of system would remain one of two viable competing systems into the future, although it did have the disadvantage of needing extra single-use equipment and requiring high maintenance. [7]
A generator interlock kit (or just interlock kit) is a device designed to allow safe powering of a home by a portable generator during a power outage. It is a less-expensive alternative to purchasing and installing a dedicated transfer switch .
Kirk Cousins will have to wear No. 18 for the Atlanta Falcons after a potential number change with tight end Kyle Pitts fell through due to NFL rules. (AP Photo/Mike Stewart) (ASSOCIATED PRESS)
The interlock device is located inside the vehicle, near the driver’s seat, and is directly connected to the engine’s ignition system. [1] It is a form of electronic monitoring . An ignition interlock interrupts the signal from the ignition to the starter until a valid breath sample is provided that meets maximal alcohol guidelines in that ...
Unlike a master key system, where each individual lock has one individual operating key and one common master key, a maison lock is designed to be operated by every key within the system. Because of the inherent lack of security in the maison key system, some jurisdictions prohibit the use of maison key systems in apartment and condominium ...