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Publication numberUS1292696 A
Publication typeGrant
Publication dateJan 28, 1919
Filing dateSep 21, 1918
Priority dateSep 21, 1918
Publication numberUS 1292696 A, US 1292696A, US-A-1292696, US1292696 A, US1292696A
InventorsCharles A Brickley
Original AssigneeCharles A Brickley
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1292696 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)



APPLICATION men SEPT. 21. 191s.

.Patented Jan. 28, 1919.




Specification of Letters Patent.

Patented Jan. 28, 1919.

Application filed September 21, 1918. Serial No. 255,039.

To all whom it may concern.'

Be it known that I, CHARLES A. BRICKLEY, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Keyhole-Guards, of which the following is a specification.

This invention relates to certain new and useful improvements in a key hole guard, which is insertible in the key hole and lockable therein, the principal object residing in the improved and novel construction and the manner of forming and assembling the parts into a simple and compact device.

The inventiony consists of a housing or casing stamped from sheet metal which is bent or folded upon itself to form a cylindrical chamber and a depending wing, a key-barrel rotatable within the chamber of the casing, a retaining lug carried by the barrel for rotation from registry with the wing into locking relation with the door,

and key-controlled means for locking the barrel against rotation within its chamber.

Further, the invention is found in the features of construction and the arrangements and combinations of parts hereinafter described and claimed, reference being had to the accompanying drawing wherein* Figure 1 is a side elevation of the improved keyhole guard.

Fig. 2 is a transverse section thereof on line 2-2 of Fig. 1.

Fig. 3 is a similar view taken on line 3--3 of Fig. 1.

Fig. 4 is a plan view of the blank for the guard casing, the parts 8 having been removed after the formation of the blank, and

Fig. 5 is an end elevation thereof.

Referring more in detail to the drawing, the numeral 1 designates the blank of sheet metal from which the casing or body is formed. This blank, while in its fiat condition, is stamped to divide it into a central longitudinal portion 2 and bordering side portions 3. The central portion consists of a narrow section and a wide section which, when rolled or bent into final shape, form two cylinders 11 and 5 interposed by one of a pair of beads 6 that include the larger cylinder 5. Each side4 portion 3 is stamped to provide a series of semi-cylindrical raised portions 7 which extend in parallelism from the central portion, within the beads 6, to the edge of the side, the raised portions 7 of one series being alined with those of the opposite series whereby when the blank assumes its final shape, the two series will oppose and supplement one another in forming a like member of pin-receiving cylindrical chambers. The side portions are also provided with registrable cutouts or openings 8. These various shapes are expeditiously performed by one or two simple stamping operations while the blank is in its flat condition. v

The final shaping operation on the blank resides in bending it upon itself to form the cylindrical chambers /1 and 5 and a depending wing part, the latter formed by bringing the sides 3 into fiat contacting relation and soldering or otherwise securing them.

A barrel 9 is rotatably mounted in chamber 5 and has a stem extension 10 operating into cylinder l for supporting the retaining lug or latch 11 in the opening 8. The barrel 9 is provided with a key slot 12 and establishing communication between the latter and the pin chambers 7 are transverse bores 18. Operable in these bores and chambers are upper and lower sets of coperating locking pins 14: and l5 which are yieldably supported on coiled springs 16 within the chambers 7 the lower ends of the latter being closed as by plugs 17.

In operation with the key 18 in the slot 12 and the retaining latch 11 alined with the wing 3 in its opening 8, the guard device is inserted in the key hole of a door, or the like, in a manner similar to inserting a key. When properly disposed. the key 18 is turned to rotate the retaining latch 11 into interlocking relation with a fixed part of the door lock whereby the guard is firmly fixed against unauthorized removal. The key hole is thus securely closed against the insertion of a tool or skeleton key by which the door lock might otherwise be rendered inoperative.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent iss A key hole guard comprising a casing constructed from a sheet of metal bent to form an inner cylinder and .a larger and alined outer cylinder joined thereto by a bead-like shoulder, the edge portions of the sheet being brought together to provide a depending web, said edge portions being tinted to form pin chambers leadin through the web from the outer cylinder, p ugs closing the lower ends of the pin chambers to reinforce the saine, a barrel rotatably fitting the outer cylinder and provided with a reduced stem extending Within the inner cylinder, said barrel having an axial key slot and radial bores leading therefrom :tor registry With the pin chambers, cooperating looking pins slidable in the bores of the barrel and the pin chambers of the Web, springs arranged on the plugs Within the chambers to expand against the pins, and a guard retaining lug carried radially by the barrel stein and extending through a peripheral opening formed in one side only of the inner barrel, said openingextending down into the underlying web whereby the retaining l5 Copies of this patent may be obtained for ye eent each, by a'cldresng the Commissioner of atents,

Washington, D. C. l

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2561029 *Aug 21, 1948Jul 17, 1951Mason George SLock-guarding plug for keyholes
US2942452 *Jan 23, 1958Jun 28, 1960Marchese Raymond RKey guide for a lock
US6779370Feb 27, 2002Aug 24, 2004Belkin ComponentsSecurity device, method of manufacturing the same, and method of operating the same
US6971254Aug 24, 2004Dec 6, 2005Belkin ComponentsSecurity device, method of manufacturing the same, and method of operating the same
US20050022566 *Aug 24, 2004Feb 3, 2005Bellow Stephen LesterSecurity device, method of manufacturing the same, and method of operating the same
U.S. Classification70/428, 70/408
Cooperative ClassificationE05B17/16