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2. Kings Norton Stop Lock - Wikipedia

   en.wikipedia.org/wiki/Kings_Norton_Stop_Lock

   The wooden guillotine style gates are suspended in a slightly raked cast iron girder frame by a chain which passes through a small block on the gate. One end of the chain passes over two large wheels to a winch mechanism. The other end passes over two more large wheels to a hidden counterweight built into the side wall of the lock. [4]

3. Panama Canal locks - Wikipedia

   en.wikipedia.org/wiki/Panama_Canal_locks

   The additional gates are 70 ft (21 m) away from the operating gates. [8] Fender chain (circa 1938) Originally the locks also featured chain barriers, which were stretched across the lock chambers to prevent a ship from running out of control and ramming a gate, and which were lowered into the lock floor to allow the ship to pass.

4. Lock (water navigation) - Wikipedia

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

   A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.

5. Caisson (lock gate) - Wikipedia

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

   Most locks are closed by chevron or mitre gates rather than by caissons. These are pairs of hinged gates that form a "V" shape, with the deeper water outside the V. Water pressure thus holds them closed. These gates can be opened and closed quickly, so they are used for canal locks, to change levels, and also for most freight docks.

6. Guillotine lock - Wikipedia

   en.wikipedia.org/wiki/Guillotine_lock

   The Weurt lock has an additional gate near the centre of the chamber. When only a few short boats want to go through the lock, they can use one half the chamber, saving water. Furthermore, when one of the gates is taken out of service for maintenance, the lock can still function at reduced capacity.

7. 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.