US94862A - Improved key-hole guard - Google Patents

Description

DAVID P. BIRD, or

tutti imite.

Rientro-0D; oHio.

Letters Patent No. 94,862, dated September 14, 1869.

IMPROVE!) KEY'J-HOLE GUARD.

i." I i The VSchedule referred to in these Letters Patent and making part of the same.

To all 'whom it 'may concern: i

Be it known that I, `DAVID P. BrRD, -of Richwood, in the county of Union, and State of Ohio, have invented a new and useful Safety-Attachment to Locks; and Ido lereby declare the following to`be a clear and enact description of the nature thereof, suicient to -:enable others skilledin the art to which my invention appertains to fully understand and use the Isame, reference being had to the accompanying drawings, mak-v ing part of this specification, in which- Y 4 Figure l is a front view ofthe attachment in a `partlyelevated position. lFigure 2 is a side view thereof', the lock being secured to adoor or elsewhere.`

Similar' letters of reference indicate corresponding parts in the two iguresl My invention consists in so arranging the spring and guides, in a plate to cover a key-hole, that the slide may be released by simply moving it to the side, withoutany manipulation of the spring, andin further strengthening the slide inits position by guide-pieces at its sides.

In the drawing- A represents one of the plates of a lock of ordinary frame and construction.

To this plate I secure guides', a a, between which is'fitted aguard-plate, B, consisting of a flat piece of hard metal, by preference of steel, and adapted to slide betweenvk the guides. p

A shank, O,\is connected to the plate B', and has a series of notches, e c', on one or' both sides. o This shank is guided by a cross-piece, b, secured to the plate A, to which also is secured a spring, D, 'which extends in the direction of the shank G, and one ot'lits ends bears on -thelatter so as to force it vagainst the inner'face of the opposite side of the crosspiece b. Y f 4 The notches c c are so'located that when'the guard-A plate B is in its highest position, that is, uncovering the key-hole, the notch c will be brought against a pin, p, wliich secures the cross-'piece b in A place, or against the side of said piece, Iwhich must be so cast ,or constructed as to tit into thenotches, and with the pressure of the spring against the shank C, the plate B will be h'eld elevated.

.The notchc performs a function similar to the-` other notch when the plate is in its lowest position, in

order to prevent the elevation of the latter.

The guides a may be cast with the lock-plate A.

After the plate B is placed in position, the cross 4 piece b is riveted to the plate B.

.The guides a may be shouldered on theirouter face, `in order to prevent the cross-piece from being riveted `too tightly over the shank of the plate B. f

The cross-piece assists the guides in retaining the plate B and shank O in position, and prevents them from coming in contact with paint. The spring works around the post opposite to the notches, and behind the cross-piece, and is held in position thereby.

The operation will be readily understood from the aforementioned description. The spring `D need only bereleased by pressing the shank against `it so as to free the notches o The guard-plate can then be readily raised I and lowered, as desired. It will be seen, that when the attachment is applied to a lock, the latter to a doory or other intended place, the guard-plate is lowered, and there retained in position by the spring, as `previously explained. A key cannot be introduced into a lock, the means of `accessbeing closed. The guards a a prevent the horizontal displacement .of the plate B by the insertion of instruments, and said plate should ybe of such metal as to resist drilling, and all attempts to break or destroy its utility.`

In order to facilitate the operation or handling of the guard-plate, I bend the upper end of the shank O to admit the ready application of the fingers.

In position, the guard is arranged between the lock and the wood-Work, as shown in iig. 2.

I do not claim a slide covering the key-hole, nor a spring for holding it in place. Having thus described my invention,

What I claim as new, and desire to secure by Letters Patent, is v The key-holel slide or protector, in combination with guides and spring, arranged as described,l so that the slide may be released Without any manipulation of th spring, as set forth. A I

The above signed by me, this 17th day of July, 1869. `Witnesses: DAVID P. BIRD. WM.- W. Kinn,

W. H. FERGUSON.

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