Applications
– Janitorial or custodial staff
– Irregular or temporary users
– Guests
– Other authorized users
– Require access to a certain key not issued directly
Operation
– One key (High Level/Special) retained in a core (at 1/4 turn)
– Another release key inserted in the other core and rotated 90° (1/4 turn)
– Retained key can be removed for use
– Release key held (trapped) for visual accountability purposes
– Cycle repeated in reverse when normally retained key is returned
Padlocks
– Key retainer can refer to a padlock
– Key cannot be removed when shackle is open
– Prevents accidentally leaving padlock unlocked
– Prevents accidentally locking key inside a locker, shed, etc.
See also
– Interchangeable core
– Interchangeable core lock cylinder
References
– Small Format Interchangeable Cores: Advanced ©2005 by William M. Lynk
– Published by The National Publishing Company, Chicago, Illinois
– Pages 212-214Sources: https://en.wikipedia.org/wiki/Key_retainer
