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US 5,686,890 AGranted
Door lock alarm
OwnerJoseph Y. Koinventor
Life of this patent
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Abstract
A lock and alarm device for securing a door activates an alarm of 110-120 decibels for approximately 60 seconds if a force on the door exceeding about 20-30 pounds is detected. An arrangement comprising a dead bolt or handle lock assembly includes an alarm unit mounted on a plate adjacent the lock for detecting forced entry.
Claims10
A lock alarm device for a door, comprising:
- a plate adapted to be mounted on one side of said door;
- a housing adapted to be mounted on said plate;
- an alarm unit contained within said housing and operated by a battery;
- a force sensor for detecting force on said door above a user-selected value, said sensor contained in said housing;
- an ON/OFF switch for electrically coupling/decoupling said alarm unit and said sensor from said battery;
- and
- a lock assembly having its actuator juxtaposed with said housing on said plate, said lock assembly to be operably coupled to a corresponding assembly on the other side of said door;
- wherein said alarm unit is activated when said ON/OFF switch is set to ON and a force greater than said user-selected value is detected.
5 more elements
A method of constructing a door lock alarm to be used to secure a door, comprising the steps of:
- a) providing a battery-operated alarm unit, a force sensor and a force sensitivity selector in a housing;
- b) mounting said housing onto a plate;
- and
- c) attaching an interior-mounting lock assembly to said plate such that said housing is juxtaposed with an actuator of said lock assembly.
1 more element
Dependencies are inferred from the claim text.