US33682A - Improved guard attachment for door-latches - Google Patents

Description

UNITED STATES PATENT OFFICE.

VILLIAM MILLER, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO HIMSELF AND J. B. BRIDGMAN, OF SAME PLACE.

IMPROVED GUARD ATTACHMENT FOR DOOR-LATCHES.

Specification forming part of Letters Patent No. 33,682, dated November 5, 1861.

To all whom t may con/cern:

Be it known that I, WILLIAM MILLER, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and Improved Guard Attachment for Door-Locks; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in Which- Figure I is a front view of my invention applied to adoor. Fig. 2 is a horizontal section of the door, taken in the line Qc x, Fig. l, and showing a plan or top view of the invention. Fig. 3 is a horizontal section of the invention, taken in the line y y, Fig. l.

Similarletters of reference indicate corresponding parts in the several figures.

The object of this invention is to obtain a simple and eicient device for securing the key of a lock at the inner side of a door, so as to prevent the key being turned at the outer side of the door by the application of pinchers orpliers-a meansfrequently used by burglars in order to enter dwellings.

The invention consists in applying a small adjustable slide-bolt to the inner side of the door, and in such a relative position with the key that the bolt may, when necessary, be shoved through the bow ot' the key, and thereby prevent the latter being turned at the outer side of the door.

To enablethose skilled in the art to fully u nderstandand construct my invention, I Will proceed to describe it.

A represents a cylindrical socket or tube, which has an arm B attached to it at right angles, and this arm is secured by a pivot a to a horizontal lip b, which projects from Va plate c, that is secured to the door C in the vicinity of the key-hole of the lock, so that by turning the arm B in one position the socket A will be inline with the bowel of the keyin the lock, and when'turned in theopposite direction be entirely out of the way of the key. This will be .fully understood by referring to Fig. 2, in which the socket is shown in black turned in line with the bow of the key, and shown turned out of the Way of the bow of the key in red.

In the socket A there is placed a bolt D,

Vpicks or keys.

which is allowed to slide freely in the socket. This bolt D has a pin e attached to it, and this pin fits in a slot f in the side ofthe socket, said slot having a vertical and a horizontal portion, as shown clearly in Fig. 1, the hori zontal portion of the slot f having notches g made in it, one or more.

The deviceis used as follows: When the key is to be secured in the lock, the operator, after locking` the door, turns the socket A in line with the bow cl of the key, and then shoves the bolt D upward until the pin e reaches the top ot slot f, the bolt being then turned so that the pin e will pass into the horizontal part of the slotI and the bolt sustained thereby, the pin e litting in any of the notches g. The bolt D when shovedupward passes through the bow cl of the key, as shown in Fig. l, and electually prevents the key being turned in the lock at the outer side ot the door, and said bolt also prevents the key being shoved out from the lock to admit of the insertion ot' WVhen it is desired to release the key, the bolt D is turned so as to bring the pin e in line with the vertical portion of the slot f and the bolt is allowed to drop in the socket A, Whichis then turned out of line with the key, as shown in red in Fig. 2.

This simple device may be constructed at a small cost and readily applied to a door. It is believed that it will prove a valuable acquisition for dwelling-houses and hotels, as the inmates ot' a room will by its use be secure against a very common mode practiced by burglars and petty thieves to unlock doors, especially bed-room doors at night, when the inmates are asleep.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The socket A, provided with the bolt D, and connected by an arm B and joint a, tothe plate o, which is attached to the door O at such a point that the socket and bolt may have a proper relative position with the bow d of the key, to operate as and for the purpose set forth.

' WM. MILLER.

Witnesses:

JOHN O. PARK, CHARLES E. PIERCE.

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