Abstract: A security lock system of the type primarily intended for signalling unauthorized opening of protected fixtures. The security lock system includes a dead bolt for engaging the fixture to be protected and a switch electrically connected to an alarm system. The dead bolt operatively engages the switch so as to energize the alarm upon an unauthorized removal of the dead bolt from the protected fixture. The alarm system is preferably energized by a direct current, and the security lock system may be utilized to generate both audible and silent type alarms.

Abstract: A three-wire electrical wiring and alarm system has a remotely located alarm device that is turned on whenever an alarm switch is actuated. The alarm device may be wired into the system or it may be operated by a radio signal broadcast from the premises to be protected. In either case an unauthorized intruder is not made aware that the alarm has been signalled. The system has a manual alarm switch and a plurality of intrusion alarm switches, each operated automatically when a corresponding window or door is opened. Manually operated selector switches are provided for disconnecting the alarm switches from power sockets in the wiring system and for selectively enabling the window and door switches. A timer keeps the alarm device on for a predetermined time period following the operation of an alarm switch.