Exit control lock

Exit control lock transmitter. If a newborn baby is removed from this section of the hospital without proper exit procedures, all exit control locks in the area switch to the locked state. Attempts to remove the transmitter from the baby's ankle also lock the exits. If the transmitter falls out (as shown here) an alarm sounds. The exits remain locked while the alarm is sounding. The exits unlock only when the alarm is re-set.

An exit control lock, also known as an exit control device, exit lock, or simply an exit control, prevents or deters unauthorized exit.^[1]

Typical uses

Exit control locks are often used in retail establishments to deter shoplifting. They are also used in airports and other controlled areas, where people are held until they clear customs or quarantine stations. Exit control locks are also used in libraries, where there is one well-staffed entrance and exit, and a number of other exits that are intended for emergency use only. Exit control devices are often used in hospitals, and can be interfaced to wireless sensors worn by newborn children, so that all exits will lock if a baby is stolen from one of the hospital rooms.

Shops

Often, shops will make an exit emergency use only to deter shoplifting. Usually, the door is locked with an Emergency Exit button next to it. Pushing the emergency exit button will unlock the door & set the shop's fire alarm off. This deters shoplifting because a person who unlocks the door in order to take an item out of the building when it is not an emergency may be reported to the Police, with CCTV footage if available.

Benefits of locking door

• Shoplifters will be deterred because using the exit would attract unwanted attention.
• Reduces requirements for security guards & security technology (e.g. CCTV, Electronic article surveillance gates).

Benefits of not locking door

• Increased footfall: Multiple exits will lead to people walking through the shop, & therefore having the shop's products advertised to them, as a shortcut.
• Psychological evidence shows that customers feel less relaxed & welcomed if there are signs saying that they are not allowed to do something if there is not an emergency. They can also feel frustrated at having to look for another exit.

Exit control designs

Many exit control locks are based on magnetic locks also delayed egress magnetic locks which will not allow the door to open immediately, this allows a guard to get to the door before the door opens (see ROFU Delayed Egress 8011-004), it will also release if there is a fire alarm or power failure, but otherwise these locks hold the exit doors shut. These units are also common in Alzheimer units.

Exit control systems can include a "request to exit detector" such as a pushbutton that opens the exit if exit requests are enabled.

In other facilities, entrance as well as exit requires authentication such as by a card reader. If an intruder slips by the entrance controls of a building, they will be able to be detained for questioning.

References

1. Keyless Locks Have Versatile Features That Protect Lives and Contain Situations By Jack M Patterson