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Publication numberUS913800 A
Publication typeGrant
Publication dateMar 2, 1909
Filing dateJul 31, 1908
Priority dateJul 31, 1908
Publication numberUS 913800 A, US 913800A, US-A-913800, US913800 A, US913800A
InventorsLudvig Andersen, Martin Hansen
Original AssigneeLudvig Andersen, Martin Hansen
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Door-lock guard.
US 913800 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

L. ANDERSEN & M. HANSEN.

DOOR LOCK GUARD. APPLICATION FILED JULYIBI, 190s.

Patented Mar. 2; 1909.

INVENTORJ.

WITNESSES 'flnds/vefl Z Mar-1Z0 Hansen fiz mwwv ATTORNEYS.

LUDVIG ANDERSEN AND MARTIN HANSEN, OF NEW YORK, N. Y.

DOOR-LOCK GUARD.

Specification of Letters Patent.

Application filed July 31, 1908.

Patented March 2, 1909.

Serial No. 4%,262.

To all whom it may concern:

Be it known that we, Lunvro Annansnn and MARTIN HANsEN, subjects of th King; of Norway, and residing at New York, in the county of New York and State of New York, have invented certain new and useful .l 1.n provements in Door-Lock Guards, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to door lock guards ol the class known as key hole protectors and which consist of a metal plug or resembling in shape, in cross section, the shank and bit of a common key, and which, is adapted to be inserted into the key hole 'l a lock and fastened therein, and which is designed to prevent the opening ol the door or the picking of the lock from either side, the said device being provided with means operated by a key for securing it in the lock.

he invention is l'ully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of our improvement are designated by suitable reference characters in each of the views, and in which;-

Figure 1 is a vertical section of a part of a door taken through the casing of the lock and through the key hole or holes and showing our improved lock guard in position for use. Fig. 2 a sectional side view of the lock guard on a larger scale and showing a key in position to be inserted thereinto; Fig. 3 a diagrammatic view showing the casing of the lock guard in dotted lines and showing the tumblers thereof in full lines, and showing a key in position to operate the tumblers; Fig. 4 a transverse vertical section on the line 44 of Fig. 2; and, Fig. 5 a plan view of a bolt or plug which forms a part of the lock guard.

In the drawing forming part of this specification, We have shown at a a part of a door and in which is secured the ordinary lock casing b, the mechanism of the lock being not shown, and said door is rovidod at its opposite sides with the usua key holes 0 which are provided with the usual escutcheon plates 0 In the ractice of our invention, we provide a locrguard (Z adapted to be inserted into one of the key holes from either side of the door, and said guard consists of a case, comprisin a horizontal top tubular member (2 and a spending bit member (1 the said case resembling in vertical transverse section, the shank and bit 01'' an ordinary key. The case of the lock guard is preferably composed of two parts, as shown in Fig. l, riveted together as shown at d, and the transverse top member d thereof is provided with a tubular bore (1, and the depending bit member (Z of said case is provided with. a chamber d in which are pivoted two rocking tumblers c and f, said tumblers being pivoted respectively at c and f and said tumblers are normally held in a horizontal position, the top tumbler a being provided at its opposite ends with upwardly directed noses or projections e and e", and the bottom tumbler f being provided at its opposite ends with upwardly directed projections or noses A spiral spring g is placed between the tumblers c and fat one end thereof, and beneath the opposite end of the tumbler c is placed a sto g, and beneath the end of the bottom tum lcr f over which the spring 9 is placed is another stop 9 Vi'e also pro-' vide a plug or bolt h which is adapted to be passed through the tubular top portion oi the lock guard as shown in Figs. 1 and 2, and whicii is provided with an annular groove 71 and is held in place by a screw 7i passed through the top of the case of the lock guard and into said groove, and said plug or bolt is adapted to be operated by a key 2'. The plug or bolt 72 is provided within the top portion ol the case of the lock guard, when said plug or bolt is in position, with two annular gro ovcs 72/ and h and one end of said plug is provided with a head It, and the end of the plug or bolt h in which the grooves 70 and are formed is provided with a longitudinal slot 7L7, and the end of the plug or bolt 7t opposite the head 7t passes through the lock guard, and when said guard is in position as shown in Fig. 1, the said end of said plug or bolt projects approximately through the lock casing I), and that portion of the plug or bolt it within the lock casing, when the guard is in position, is provided at one side with a radial pin lbs.

The key 2' consists of a flat plate member i provided at one end with a head or handle i and the bottom edge of-the plate member *3 is provided adjacent to the end opposite the head i with a recess i, and adjacent to the head end i with another recess 0?, and between the recesses i and i is a longer recess i.

In the operation of this device, the guard is inserted into one of the key holes as shown in Fig. 1, and in this operation the radial pin its is turned down, as shown in dotted lines in Fig. 1, the hey i being also inserted into the slot h in the plug or bolt h as is also "engage one of the sides I) of the lock casing b and the guard will be locked in the key hole and cannot be removed until the hey i is again inserted and turned through a half revolution so as to throw the pin h into the position shown in dotted lines in Fig. 1. In the normal position of the tumblers e and the nose or projection e of the tumhler e enters the slot It in the plug or bolt h as shown in Fig. 2, and the nose or projection f of the tumblers f also enters said slot, and the said plug or bolt cannot be turned except by the key 2', the insertion of which throws the said tumblers into the position shown in Fig. 3, and in this position the nose or projection e of the tumbler e enters the groove h in the plug or bolt h and the nose or projection f of the tumbler f enters the groove k of said plug or bolt, while the opposite noses or projections of said tumblers rest on the bottom edge of the key as shown in Fig. 3, and this permits the turning of the bolt or plug it by the key.

Our improved lock guard is simple in construction and operation, but can only be manipulated by the proper key, and when said guard is in the position shown in. Fig. 1, the lock cannot be picked and the door cannot be opened except by a party provided with the hey i.

Having fully described our invention,

what we claim as new and desire to secure by Letters Patent, is

1. A lock guard comprising a case adapted to be inserted into a key hole of the lock, and to fit therein, a bolt passed through the top portion of said case and rotatable therein, and provided within case with two annular grooves, the end of said bolt within said case being also provided with a longitudinal slot, two rocking tumblers, pivoted in said case below said bolt, and provided at their opposite ends with upwardly directed noses or projections, one nose or projection at the end of each tumbler being adapted to enter the grooves in said bolt and the other noses or projections at the opposite ends of said tumblers being adapted to enter the slot in said bolt, a spring placed between said umblers at one end thereof, stops for holding said tumblers in a normal position, and a key adapted to be inserted into the slot in said bolt, and to operate said tumblers and to rotate said bolt.

2. A look guard comprising a case adapted to be inserted into the key-hole of a look, a bolt passed through the top portion of said case, and secured therein and rotatable therein, that part of said bolt within said case being provided with annular grooves, and with a longitudinal slot, pivoted tumblers mounted in said case below said bolt, and normally held in a horizontal position, said tumblers being provided at their opposite ends with upwardly directed. noses or projections adapted to enter the slot in said bolt and at their other ends with upwardly directed noses or projections adapted to enter the annular grooves in said bolt, one end of said. bolt being projected into the lock casing of the door and being provided with a radial pin, and a key adapted to be inserted into the slot in said bolt and to operate said tumblers and to rotate said bolt.

In testimony that we claim the foregoing as our invention we have signed. our names in presence of the subscribing witnesses this 29th day of July 1908.

LUDVIG ANDERSEN. MARTIN HANSEN. Witnesses A. R. APPLEMAN, C. E. MULREANY.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
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
Classifications
Cooperative ClassificationE05B17/16