deadlocking latch bolt
deadlocking latch bolt[′ded‚läk·iŋ ′lach ‚bōlt]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
auxiliary dead latch, auxiliary latch bolt, deadlocking latch bolt, trigger bolt
A supplementary latch in a lock which automatically deadlocks the main latch bolt when the door is closed.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.