US68947A - Daniel bull - Google Patents

Description

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DANIEL BULL, OF AMBOY, ILLINOIS, ASSIGNR T0 ,IIIMSELF `AND J. B. i

BOOKER.

Letters .Patent No. 68,947, 'ated September 17, 1867.

IMPBOVBD DOOR AND BLIND-FASTENING.

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'IO ALL WI-IOM IT MAY CONCERN:

Be it known that I, DANIIJL BULL, of Amboy, in the county of Lee, and State of Illinois, have invented a. new and improved Fastening for Double Doors and Blinds; and I do hereby declare that the following is a. full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part'of this specification, in whichp Figure 1 is an'elevation of double doors with parts broken away to show the improved fastenings.

Figures 2 and 3 represent the construction of the bottom fastening.

Figures 4 and 5 represent the construction of the top fastening.

Similar letters of refer ence indicate corresponding parts in the several figures.

The object of this invention is to prevent the picking" of bolt-fastenings of double doors, by so constructing a fastening that when it is applied to one door, and both doors closed, the other door will lock and hold the fastening firmly in place, as will be hereinafter described. Hithcrto double' doors have been secured when closed and locked by means of bolts applied to thc upper and lower endsof o ne of the doors so as'to shoot into the sill and lintel. These bolt-fastenings are very insecure and troublesomeyas they can be easily picked from the outside, and thus allow both doors to bethrown open.

To enable others skilled in'the art to understand my invention, I will describe its construction and operation.- In the accompanying drawings I have represented two different forms of'fastenings appliedto the door A,

one of which may bc applied to the lintel B, and the othei` to thc lower end of the door. The door A has any i.

of the well-known forms of locks applied to it in thel usual manner, so as to secure itV to the .door A when closed. The fastening which is represented at the .lower end of the door A, in iig. 1, and which is represented detached from the door, in figs. 2 and 3, consists of a right-angular plate 'or frame, a, which is recessed into the inner lower corner of the door A so. as to be Hush with the edges thereof, as show n in iig. 1. Tothis frame a. a spring-latch, C, is applied, having a double-bcvelled nose, b b', formed on` its lower projecting end, which is adapted for springing. into a V shaped channelplate,-D, when the door is closed. The laterally projecting portion b of the nose b projects a. shortidistance from the vertical portion of frame a, so that when both doors A A are closed, the door A will receive said portion b beneath-it, and thus prevent the latch from being raised out of its recess in plate D. The plate D is recessed into the door-sill flush with the surfacethereof, and serves as a friction or wearing-plate for the nose of the latch. That portion of the lower edge of the door A which receives under it the latch portion I1 may be faced with metal, as shown at fin `iig. `1. The stem of latch C passes upward through a stud, d, and has a spring, g, -coiled around it for keeping the latch down ain place and allowing it to spring upward, when the door is closed. A stud, g', is formed on the inner face of the lower portion of the latch, which will prevent the latter from being forced too far down or dropping out of its place. y

By inverting this-fastening, which Ihave above described, and applying it to the upper corner of the door A, it will serve just as well for auf-upperfastening as for the 'lower fastening. In this case the latch will bel locked in place when both doors are closed by the door Apassing beneath the projecting portion of the nose b. In figs. 4 and '5 I have represented a fastening, which is'designed particularly for the upper portion of the door A. This fastening is recessed into the bottom face of the lintel, as shown in g.1, and has a. doublebevel nose, h, formed on its lower end, which catches into a. recessed plate, j, applied upon the upper edge of the door A when this door is shut. From the inner vertical face of said nose L a lip, k, projects, which, when the door A is shut, is caught and held down by a plate, l, on the top edge of this door, as shown in iig. 1. This upper fastening may be used as a lower fastening for blinds or shutters or desk-doors, but I prefer to use the fastening shown in figs-2 and 3 for this purpose. This fastening of figs. 2 and 3 would not be objectionable for an upper as well as a lower fastening.

From the above description it will be seen thatI so construct a. fastening for double doors, shutters, or

blinds, that when applied to one door, and both doors closed, the other door will, by means of a projecting lip l on the latch, lock this latch in place so that it cannot be picked. It will also be seen, from the above description, that I employ spring-latches which are selfadj nsting, and which admit of the door A being readily opened or shut when the door A is open.

seien 2 I have described two practical modes ot" carrying my invention into effect, but I do not confiney myself' to the precise construction of the devices here-in shown, :is other forms may be adopted. The gist of my invention is to have one door lock the fastening of-the other in such manner that such fastening cannot be picked when both doors are shut. The lock and bolt-fnstenings which .ztre applied to the door A may be constructed in :my well-known manner. v

Having described mj invention, what I olztinios new, and desire to secure by Letters Patent, is-

1. The construction of the spring-door fastening, for the purpose described, with the self-adjusting latc'nngnose haring a lip or locking projection. formedon it, substantially as described.

2. The spring-door fastening for double doors, which, when both ldoors are shut, .will belockedend hel firmly in place by one of the doors, substantially as described.

' DANIEL BULL.

Witnesses:

WILLIAM D. ANDREWS, JosIAn LITTLE.

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