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US 4,365,491 AGranted
Guard plate
OwnerEdward Rubinstein, Efim Rubinshteininventors
Life of this patent
Estimating the term…
Abstract
The improved guard plate of this invention is used to protect the cylinder of a lock. It includes a relatively flat body, attached to the door in the vicinity of the cylinder, and a disc rotatably mounted between the door and the flat body. In an open position, an opening in the disc permits access to the cylinder; and, in the closed position, the solid portions of the disc do not permit access to the cylinder. In addition, rotatable fingers are provided so as to lock the rotatable discs in either the open or closed position.
Claims14
An improved guard plate for protecting a cylinder of a lock, comprising:
- a body attached to the door in the vicinity of the cylinder, said body having a first opening in alignment with said cylinder;
- a disc rotatably mounted on an inside surface of said body between said body and said door, said disc having an opening approximately equal in size to said first opening of said plate;
- means for rotating said disc positioned on a surface of said disc and being accessible through a second opening in said body;
- and at least one substantially round finger including a cutoff portion, rounded portions of each finger interacting with a respective groove made on the periphery of said disc to prevent rotation of said disc, rotation of each finger causing said rounded portions to move away from respective grooves and causing said cutoff portions to become aligned with said respective hollow grooves, thereby permitting rotation of said disc, and each finger being rotatably inserted in a respective third opening in said plate.
1 more element
Dependencies are inferred from the claim text.