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2. 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.

3. 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 ]

4. Portcullis - Wikipedia

   en.wikipedia.org/wiki/Portcullis

   A portcullis (from Old French porte coleice ' sliding gate ') is a heavy, vertically closing gate typically found in medieval fortifications. [1] A portcullis gate is constructed of a latticed grille , made of wood or metal or both, which slides down grooves inset within each jamb of the gateway.

5. Door furniture - Wikipedia

   en.wikipedia.org/wiki/Door_furniture

   A lock is a device that prevents access by those without a key or combination, generally by preventing one or more latches from being operated. [4] Often accompanied by an escutcheon . Some doors, particularly older ones, will have a keyhole accompanying the lock.

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. Lever tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Lever_tumbler_lock

   Animation of a lever tumbler lock mechanism. A lever tumbler lock is a type of lock that uses a set of levers to prevent the bolt from moving in the lock. [1] In the simplest form of these, lifting the tumbler above a certain height will allow the bolt to slide past.