Detector lock

See under Lock.
a lock containing a contrivance for showing whether it as has been tampered with.

See also: Detector, Lock

References in periodicals archive ?
Robert Barron patented two methods in 1778 for the doubleacting lever lock, before fellow Brit Jeremiah Chubb patented the detector lock in 1818 - which revealed if someone had tried to pick it.
The firm was established by his great-great grandfather Charles Chubb who devised the detector lock in 1818, and it had been run by the Chubb family ever since.
These include a 1680 detector lock made and signed by John Wilkes; a tubular rocking chair, dated 1840-1850 by R W Winfield, of Birmingham, and candelabrum designed for the House of Lords in 1846 by John Hardman & Co.