Digital Encyclopedia

Door Latch For Doors *** Applications: A. Security - Authorization/ID, Prevent Burglary Via lock picking , prevent robbery and other forms of theft B. Pets- Prevent lawsuits & legal liability claims for bites from pets C. Children - Prevent missing children and children who wander off **** Relevant Background: “A door chain, security chain, or security door chain consists of a small chain attached to the door frame, which attaches to a track on the door for security purposes. It is a type of lock that is often used along with other types of locks to secure a door... Door chains are mainly intended to allow a person inside a structure to open the door slightly for purposes of communicating with individuals outside or exchanging small objects through the door while still preventing the individuals outside from gaining unauthorized access into the structure...Door chains also can be set in place when the door does not need to be opened. They can only be touched from inside when t...

  Hydraulic Door Closer Installation  ***************************************** Hydraulic Door Opener Applications: Garage entry doors, Hallways, Shops/restaurants, Office, Emergency Doors, Security Entry/Exit Doors with alarms, Condo, Basements, Storage *** Relevant Background: " A  door closer  is defined as any  mechanical device  that closes a  door  in a controlled manner, preventing it from slamming, in general after someone opens it, [1]  or after it was automatically opened. The force used to open the door is stored in some type of spring and when released this energy is then utilised to return the door to a closed position. Door closers can be linked to a building’s fire alarm system. Where doors need to be held open for the majority of the time they are held back with an electromagnetic device. [2 ]   When the fire alarm is triggered it cuts power to the electromagnetic hold-open device allowing the doors to close. These hold...