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2. Door chain - Wikipedia

   en.wikipedia.org/wiki/Door_chain

   A door chain, security chain, or security door chain or chain door interviewer [1] 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. [ 2 ]

3. Flip-flop (electronics) - Wikipedia

   en.wikipedia.org/wiki/Flip-flop_(electronics)

   A gated SR latch can be made by adding a second level of NAND gates to an inverted SR latch. The extra NAND gates further invert the inputs so a SR latch becomes a gated SR latch (a SR latch would transform into a gated SR latch with inverted enable). Alternatively, a gated SR latch (with non-inverting enable) can be made by adding a second ...

4. Door furniture - Wikipedia

   en.wikipedia.org/wiki/Door_furniture

   Latch bolt – A bolt that has an angled surface that acts as a wedge to push the bolt in while the door is being closed. By the use of a latch bolt, a door can be closed without having to operate the handle. Deadbolt – Deadbolts usually extend deeper into the frame and are not automatically retractable the way latch bolts are. They are ...

5. Padlock - Wikipedia

   en.wikipedia.org/wiki/Padlock

   The typical shackle is a U-shaped loop of metal (round or square in cross-section) that encompasses what is being secured by the padlock (e.g., chain link or hasp). Generally, most padlock shackles either swing away (typical of older padlocks) or slide out of the padlock body when in the unlocked position.

6. Door security - Wikipedia

   en.wikipedia.org/wiki/Door_security

   A metal doorframe with a strike plate built in: in other doors this would be a metal strikeplate in a wooden doorframe. The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions.

7. Latch - Wikipedia

   en.wikipedia.org/wiki/Latch

   A Suffolk latch is a type of latch incorporating a simple thumb-actuated lever and commonly used to hold wooden gates and doors closed. Comparison of Suffolk and Norfolk latches. The Suffolk latch originated in the English county of Suffolk in the 16th century and stayed in common use until the 19th century. They have recently come back into ...