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2. Floodgate - Wikipedia

   en.wikipedia.org/wiki/Floodgate

   Drum gates on a diversion dam: Roller gates are large cylinders that move in an angled slot. They are hoisted with a chain and have a cogged design that interfaces with their slot. Clamshell gates have an external clamshell leaf design. A roller gate on the Mississippi. Clamshell floodgates at the Arrowrock Dam.

3. Roller shutter - Wikipedia

   en.wikipedia.org/wiki/Roller_shutter

   A roller shutter, security shutter, coiling door, roller door or sectional overhead door is a specialized type of door or window shutter consisting of multiple horizontal slats, bars, or web systems interconnected through hinges. The mechanism involves lifting the door to open it and lowering it to close.

4. Sliding glass door - Wikipedia

   en.wikipedia.org/wiki/Sliding_glass_door

   Sliding glass door frames are often made from wood, aluminum, stainless steel, or steel, which also have the most strength. The most common material is PVC plastic. Replacement parts are most commonly needed for the moving-sliding parts of the door, such as the steel rollers that glide within the track and the locking mechanisms.

5. 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.

6. Platform screen doors - Wikipedia

   en.wikipedia.org/wiki/Platform_screen_doors

   However, these gates are less effective than full platform screen doors in preventing people from intentionally jumping onto the tracks. [14] These gates were first [clarify] in practical use by the Hong Kong MTR on the Disneyland Resort line for the open-air station designs. Most half-height platform edge door designs have taller designs than ...

7. Sliding door - Wikipedia

   en.wikipedia.org/wiki/Sliding_door

   Some sliding doors run on a wall-mounted rail, like this one Sliding doors in a modern wardrobe. The 'top-hung' system is most often used. The door is hung by two trolley hangers at the top of the door running in a concealed track; all the weight is taken by the hangers, making the door easier to move.

8. Free Online Games: Play board games, card games, casino ... - AOL

   www.aol.com/games

   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

9. Caisson (lock gate) - Wikipedia

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

   Rolling caissons are a development of sliding caissons fitted with rollers beneath. These do not rely solely on buoyancy to make them portable and so are easier to operate. [ 7 ] The caisson may only need to be lifted a few inches to make it movable on its track, which significantly reduces the ballast pumping time compared to a ship caisson.