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US 6,784,784 B1Granted
Request to exit switch for door alarm system
OwnerRaymond E. Zehrunginventor
Life of this patent
Estimating the term…
Abstract
A door alarm system and a door lock assembly having an interior rose having a request to exit (REX) switch. The alarm system generates an open door alarm when a door into a secured area is open unless the REX switch generates a REX signal indicating that the door was opened by someone on the inside of the secured area. Mechanical isolation in the door lock assembly prevents a forcing movement on the outside of the door from causing a false generation of the REX signal.
Claims25
An alarm system, comprising:
- a control unit for generating a lock control signal in response to a request to enter (REN) signal;
- and generating an alarm signal in response to an open door signal when both of said REN signal and a request to exit (REX) signal are absent;
- a door detector for generating said open door signal indicative of an open door, said door having an exterior side and an interior side;
- a device for generating said (REN) signal in response to a request to unlock said door from said exterior side;
- a door lock assembly fixed to said door for unlocking said door in accordance with said lock control signal;
- the door lock assembly engaged to an interior handle on said interior side for unlatching said door in response to a rotation of said interior handle, the door lock assembly having mechanical isolation between said exterior side and said interior side;
- and
- a REX switch within the door lock assembly on said interior side for generating said REX signal in response to said rotation, wherein said mechanical isolation prevents force on said exterior side from generating said REX signal.
5 more elements
A door lock assembly comprising:
- an interior spindle for rotating within the door lock assembly for unlatching a door in response to a rotation of an interior handle;
- and
- an interior spring package including a request to exit (REX) switch for generating a REX signal in response to said rotation of said interior handle, the interior spindle passing loosely through an aperture in the spring package to said interior handle.
A door lock assembly comprising:
- an interior spindle for rotating within the door lock assembly for unlatching a door in response to a rotation of an interior handle;
- a trim piece including a request to exit (REX) switch for generating a REX signal in response to said rotation of said interior handle;
- and
- an exterior spindle for rotating within the door lock assembly for unlatching said door in response to a rotation of an exterior handle, the interior spindle mechanically isolated from the exterior spindle for preventing movement of the exterior spindle caused by an external force on said exterior handle from causing a false generation of said REX signal.
1 more element
A trim piece, comprising:
- a switch actuator plate coupled to an interior handle for rotating in response to a rotation of said interior handle, said interior handle for rotating an interior spindle for unlatching a door, the switch actuator plate having a step, said interior spindle having no rotational connection to the switch actuator plate except through said interior handle, said step revolving about a center axis in response to said rotation;
- and
- a request to exit (REX) switch for generating said REX signal when said step revolves past a position juxtaposed to said REX switch.
A method, comprising:
- providing a cylindrical door lock assembly for unlocking a door in accordance with a door control signal, said door lock assembly including an interior spindle engaged to an interior handle for rotating about a center axis for unlatching said door in response to a rotation of said interior handle;
- and an interior trim piece engaged to said interior handle, said interior spindle for passing loosely through an aperture in said trim piece;
- and
- installing a request to exit (REX) switch in said interior trim piece for generating a REX signal in response to said rotation.
1 more element
A method, comprising:
- providing a cylindrical door lock assembly for unlocking a door in accordance with a door control signal, said door lock assembly including an interior spindle engaged to an interior handle for rotating about a center axis for unlatching said door in response to a rotation of said interior handle;
- and an interior trim piece engaged to said interior handle, said interior spindle for passing loosely through an aperture in said trim piece, said trim piece including a request to exit (REX) switch;
- and
- generating a REX signal from said REX switch in response to said rotation.
1 more element
Dependencies are inferred from the claim text.