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2. 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.

3. Caisson (lock gate) - Wikipedia

   en.wikipedia.org/wiki/Caisson_(lock_gate)

   When closing the gate, the track guides it automatically back into place, avoiding the slow manoeuvering with tugs or winches necessary to align a ship caisson. Electrically-operated sliding caissons, installed around 1900, on the entrance of the Zeebrugge Canal to the North Sea could operate within two minutes. [3]

4. Hold (compartment) - Wikipedia

   en.wikipedia.org/wiki/Hold_(compartment)

   The term cargo hatch can also be a used for any deck opening leading to the cargo holds. Aircraft and spacecraft may also used the term for its cargo doors. [4] Basic types: Lifting (up to remove) Rolling (rolls up on to a pole, trap type) Folding (fold up like paper or an accordion; Sliding (slides on to the deck or over the side of ship)

5. Lock (water navigation) - Wikipedia

   en.wikipedia.org/wiki/Lock_(water_navigation)

   The entrance gates are opened and the boat moves in. The entrance gates are closed. A valve is opened, this lowers the boat by draining water from the chamber. The exit gates are opened and the boat moves out. [11] If the lock were empty, the boat would have had to wait 5 to 10 minutes while the lock was filled.

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. Door ...

7. Door - Wikipedia

   en.wikipedia.org/wiki/Door

   The door slab is mounted to roller and a track at the top of the door and slides inside a wall. Sliding glass doors are common in many houses, particularly as an entrance to the backyard. Such doors are also popular for use for the entrances to commercial structures, although they are not counted as fire exit doors.