Reverse Master Key System

Japanese: 逆マスターキー・システム - ぎゃくますたーきーしすてむ
Reverse Master Key System

Master Key Systems are used to lock and unlock a number of locks, including a master key system that allows one key to lock and unlock all the different locks, a grand master key system that allows one key to lock and unlock multiple groups of locks equipped with a master key system, and a reverse master key system that is used for common entrances to apartment complexes and office buildings, etc., and allows each individual key to lock and unlock specific locks.
[System Lock]
System locks include electric locks that use an electromagnet in the main mechanism of the lock instead of using a key to unlock it, so that the locking bolt retracts (or the knob can be turned) when electricity is applied, and electric strike locks that open the metal part (strike part) that receives the locking bolt on the door frame when electricity is applied, allowing the door to be opened.

*Some of the terminology that refers to the "reverse master key system" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…このため一つの鍵で多数の錠の施・解錠ができるようにしているのがふつうで,その鍵をマスターキーと呼ぶ。マスターキーのシステムには,それぞれ異なる錠を1本の鍵ですべて施・解錠できるマスターキー・システム,マスターキー・システムを備えた複数のグループの錠を別の1本の鍵で施・解錠できるグランドマスターキー・システム,集合住宅やオフィスビルなどの共通の出入口などに使用され,それぞれ異なる個々の鍵で特定の錠だけは施・解錠できるようにした逆マスターキー・システムなど,さまざまなものがある。
[システム錠]
 鍵を使用して解錠するかわりに錠の本体機構に電磁石を利用し,通電すると本締めボルトが引っ込む(またはノブが回せるようになる)電気錠,通電することにより扉枠側につく本締めボルトを受ける金物(ストライク部)が開き開扉できる電気ストライク錠などをシステム錠という。…

※「逆マスターキー・システム」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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