US971122A - Keyhole-guard. - Google Patents

Description

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GEORGE M. DUNLEVY, OF NEW CUMBERLAND, WEST VIRGINIA.

KEYHOLE-GUARD.

Application filed November 23, 1909.

Specification of Letters Patent.

Patented Sept. 27, 1910.

Serial No. 529,598.

To all whom it may concern:

Be it known that I, GEORGE M. DUNLEVY, a citizen of the United States, residing at New Cumberland, in the county of Hancock and State of West Virginia, have invented certain new and useful Improvements in Keyhole-Guards, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certain new and useful improvements in key-hole guards and has for its object to provide a very simple device which will cover the keyhole and prevent the insertion of a key therein from the outside of the door, thus eliminating the danger of burglary.

Another object is to provide a rectangular bar extending transversely through the door above the keyhole and having a plate secured to each end thereof disposed over the keyhole upon the inner and outer faces of the door, the inner plate having an opening registering with the keyhole so that the key may be inserted from the inside, the insertion of the key preventing the turning of the outer plate to expose the keyhole.

With these and other objects in view, the invention consists of the novel construction, combination and arrangement of parts, hereinafter fully described and claimed, and illustrated in the accompanying drawing in which Figure 1 is an e evation illustrating the application of the device; Fig. 2 is a vertical section taken on the line 2-2 of Fig. 1, and Fig. 3 is a detail perspective view of the device removed from the door.

Referring to the drawings 5 indicates a door, and 6 the lock casing which is provided with a keyhole 7 in the usual manner. Extending through this casing immediately above the keyhole is a rectangular bar 8 which extends beyond the opposite sides of the door and has secured on each end a plate 9. The inner plate is provided with an opening 10 which is of similar form to the key opening and registers therewith so that the key may be readily inserted through the plate to shoot the lock bolt into locking position. A screw 11 having a head of larger diameter than the cross sectional area of the bar 8 is threaded into the inner end of the bar, the head thereof engaging with the plate to rigidly secure the same thereon. The plate 9 which is disposed upon the outer end of the bar 8 is not provided with an opening but completely covers the keyhole and is adapted to prevent the insertion of a key to unlock the door after the same has been locked from the inside of the apartment. The end of the bar 8 is formed with a flange 12 which is disposed upon the outer face of the outside plate 9 and prevents its removal from the bar.

In the operation of the device, the key is inserted from the inside and the door locked. The key is allowed to remain in the lock and as it extends through the opening 10 in the inner plate 9, it will be obvious that it is impossible to turn the outer plate 9 so as to remove the same from its position over the keyhole. In this manner the possibility of the entrance of intruders is prevented, as so long as the key remains in position in the lock, it will be impossible to move the outer plate so that a key may be inserted in the keyhole from the outside. The plates 9 at all times fit closely against the opposite sides of the lock casing, and the bar 8 is provided with the short cylindrical portions 8 adjacent to its ends which are disposed in the opposed plates of the lock casing, whereby the bar and the plates 9 may be rotated so that when the key is not disposed in the look from the inside the outer plate may be swung to one side of the key opening and the key inserted therein to lock or unlock the door. In this manner the device may be used at night to effectually prevent the unlocking of the door so that absolute security may be had and the possibility of burglary prevented. 4

From the foregoing it will be seen that I have provided a device of very simple construction which is admirably adapted for the purposes in view, and will efiiciently perform the function for which it is designed.

While the form of the device as shown in the accompanying drawing would be preferred, it would be obvious that numerous changes in the form and proportions thereof may be resorted to without materially departing from the spirit or sacrificing any of the advantages of the invention.

Having thus described the invention what is claimed is:

A device of the character described comprising a rectangular bar disposed transversely through a door above the keyhole, said bar having a cylindrical bearing portion adjacent to each end, a plate disposed upon each end of said bar, one end of the bar having a flange thereon bearing upon the the lock being adapted to prevent the rota- 10 plate, a screw threaded in the other end of tion of the bar and plates.

said bar provided With a head of greater In testimony whereof I hereunto attiX my diameter than the area of the bar adapted to signature in the presence of two Witnesses. secure the other of the plates thereon said 7 plates being disposed over the keyhole, the GEORGE DUNLEVL plate on the inner end of said bar having an Vitnesses:

opening registering with the keyhole to re- ARMOUR S. COOPER,

ceive the key, the positioning of the key in OLIVER S. MANHELD.

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