Patent ID: 7828347

Claim:
A fire plate and door assembly, the door having a lock opening bored from a first face of the door perpendicularly through the door to a second face of the door, the lock opening having a curved inner surface and defining a lock opening axis and the door having a latch opening bored from an edge of the door into the lock opening perpendicular to the lock opening axis, the fire plate capable of receiving a bored-in-lock assembly and preventing passage of fire through the lock opening, the fire plate comprising: a first fire stop barrier formed from a fire resistant sheet material, the fire resistant sheet material defining a substantially planar surface of the first fire stop barrier, the first fire stop barrier being shaped to fit within the lock opening with the substantially planar surface of the first fire stop barrier being oriented substantially parallel to the first and second face surfaces of the door and substantially perpendicular to the lock opening axis, the substantially planar surface of the first fire stop barrier having a first curved perimetrical edge corresponding in curvature to and contacting an upper part of the curved inner surface of the lock opening, the fire resistant sheet material forming the first fire stop barrier extending across the lock opening to resist passage of fire through the lock opening, the first fire stop barrier having a first opening for allowing connection between the bored-in-lock assembly and a first handle; a second fire stop barrier formed from a fire resistant sheet material, the fire resistant sheet material of the second fire stop barrier defining a substantially planar surface of the second fire stop barrier, the second fire stop barrier being shaped to fit within the lock opening with the substantially planar surface of the second fire stop barrier being oriented substantially parallel to the first and second face surfaces of the door and substantially perpendicular to the lock opening axis, the substantially planar surface of the second fire stop barrier having a second curved perimetrical edge corresponding in curvature to and contacting a lower part of the curved inner surface of the lock opening, the second fire stop barrier having a second opening for allowing connection between the bored-in-lock assembly and a second handle; and a fire stop connector connecting the first and second fire stop barriers and holding the first and second fire stop barriers in an opposed spaced relationship to receive the bored-in-lock assembly therebetween; the fire stop connector being positioned away from the latch opening to allow the bored-in-lock assembly to operate a latchbolt in the latch opening, and the first and second fire stop barriers being cooperatively shaped and positioned relative to the bored-in-lock assembly and to the lock opening to prevent the passage of fire in the direction of the lock opening axis around the bored-in-lock assembly.