guard lock


Also found in: Dictionary, Wikipedia.

guard lock

[′gärd ‚läk]
(civil engineering)
(engineering)
An auxiliary lock that must be opened before the key can be turned in a main lock.
References in periodicals archive ?
"The East Guard Lock is a well-known landmark on the Erie Canal in Rochester and ensuring its upkeep is a top priority," Canal Corp.
Door Rh Beml Furnished With Lock Assembly, Door Latch Sunken Type Locking Plate For Pad Lock And Guard Lock Argt With 8 Window Bars For Beml Coaches, Sizes Of Door As Per Annexure Attached.
BOC-Naia district collector Carmelita Talusan said that 20 rifle hand guards and six hand guard locks were found inside a package from Shanghai, China.
AN investigation has been launched into claims that a security guard locked a homeless man's sleeping bag in a bin overnight, leaving him "blue with cold".
They immediately shut the door and went inside while the guard locked the main armoured gate, according to the police investigators.
"After the terrorists stormed the district courts, the judge, his reader, a court clerk and the guard locked themselves inside the retiring room of the judge.
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.
After entering the classroom at Sing-Sing, the guard locked the door, and I would not see him again until the class ended when he came back to unlock the door.
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