Guard lock

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(Engin.) a tide lock at the mouth of a dock or basin.

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The inspection work includes but is not limited to; locks, fixed dams, moveable dams, guard gates, guard locks, tainter gates, retaining walls, sluice gates, waste weirs, culverts and spillways.
The range includes key switch interlocks, key exchange units, access guard locks, timer delay units and solenoid control devices.
The barrel's integral gas block dovetails around the front end of the slide, and a rotating lever located in the frame just above the front of the trigger guard locks the rear of the barrel solidly into place in a mortise inside the frame.
In prison the guard locks and unlocks all the doors for you, but at work you must often carry a security card and open all the doors for yourself.
CLOSING: A security guard locks the factory gates, right; and above, the BPI factory in Stockton Picture by IAN COOPER