US336789A - Key-hole guard - Google Patents

Description

(No Model.)

W. W. BROGA.

KEY HOLE GUARD.

No. 336,789. Patented Feb. 23, 1886.

WITNESSES WzZZz'am B2090,

l .dttorneys.

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2 Sheets-Sheet 1.

2 SheetsSheet 2.

(No Model.)

W. 'W. BROGA.

KEY HOLE GUARD.

Patented Peb. 23, '1886.

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WITNESSES N. PETERS, Pholn-lilhogfipher. Wflhingtom D. C.

UNITED STATES PATENT OFFICE.

XVILLIAM \VALLAGE BROGA, OF OTIS, MASSACHUSETTS.

KEY-HOLE GUARD.

SPECIFICATION forming part of Letters Patent No. 336,789, d ted February 23, 1886.

Application filed July 22, 1885.

To rrZZ whom it may concern.-

Be it known that I, WILLIAM W. BROGA. a citizen of the United States, residing at Otis, in the county of Berkshire and State of Massachusetts, have invented a new and useful Improvement in Key-Hole Guards, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to an improvement in key-hole guards; and it consists in the peculiar construction and combination of parts that will be hereinafter set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of a lock embodying my invention, with the inner face removed and the bolt withdrawn. Fig. 2isasimilar view showing the bolt extended when locked. Fig. 3 is a side elevation of the lock with the outer face removed. Fig. 4is averti cal longitudinal central sectional view. Fig. 5 is avertical crosssect-ional view taken on the line at m of Fig. 1. Figs. 6, 7, and 8 are detail views.

A represents the lock-case, which is preferably rectangular in shape,and is provided with the inner face, B, and the outer face, 0. The inner face, B, has the key-hole D, and the outer face, 0, has a similar key-hole, E, which is in line with the key-hole D.

F represents a circular plate, which is countersunk in the inner side of the outer face, O, and is pivoted centrally on a stud, O, the inner end of which is formed into aheaded plate, P, which is provided with an opening, R, that registers with the key-hole. An opening, H, is made in one side of the circular plate F, which corresponds to the key-hole, and on one side of said plate F is a cutaway portion or slot, I, in which worksa. stud, K, that projects inwardly from the outer face of the lock-case. On the opposite side of the plate F from the opening H is a longitudinal slot, L, which has at one end a communicating angular arm, M, and at the opposite end a communicating arm, N, which is at right angles to said slot.

S represents a sliding bolt, which is secured in lock-case between the studs a. The inner end of this bolt is provided with a notch, T, which is rounded on its sides, at the outer end thereof, as shown. Apivotal stud, U, projects from one side of. this bolt toward the outer face of the lock cas'e, and on this pivotal stud is Serial No. 172,315. (No model.)

fulcrumed an arm, V, which is provided at its rear extremity with stud \V, which engages normally with the slot L of the plate F. On a stud, b, is pivoted a tumbler, A, against the outer end of which, on the upper side thereof, bears a spring, B. A stud, Z, projects from the face of the bolt S, opposite the arm V, and this stud enters an open slot. 0, in the outer end' of the tumbler. Notches D are made at the inner end of this open slot, and similar notches, E, are made at the outer end thereof.

The operation of my lock is as follows: In order to open or close the lock, I use a key, F, the web of which is provided on its outer side, at its outer end, with a notch, f, which corresponds in width with the thickness of the inner end of the arm V. Theiuner side of said web is provided at its outer end with a projection, f, which is only about onehalf as deep as the notch f. Vhen the key isinserted into the key-hole from the inner side of the lock-case and turned, the notchf passes over the inner end of the arm V without moving said arm, and the web of the key enters the notch T of the bolt S. Just before actuating the bolt the key bears against the under side of the tumbler A, and, as said key is turned, raises the tumbler against the pressure of the spring B and releases the stud Z from the upper inner notch, D, the bolt to be moved into the position shown in Fig. 2, when the tumbler is pressed downwardly by the spring B, and causes the outer upper notch, E, to engage the stud Z, and thereby secure the bolt against inward move ment until the tumbler has been raised. A spring, G, bears against the arm V, which spring, when the bolt is in its initial position, causes the stud W to bear in the angular arm M of the slot L in plate F. As the bolt is moved forward, as hereinbefore described, the stud W partly rotates the plate F, and causes said plate to close the key-hole on the outer side of the lock, and thereby effectually prevents the lock from being picked by any person on the outside. When the key is inserted in the outer side of the lock, the projection f moves the free end of the arm V upwardly, so

into the slot L. .As the key continues to turn, the tumbler is raised to release the bolt S, as hereinbefore set forth, and as the bolt moves as to move the stud W out of the bent arm M and so as to free it and allow my invention, I

a the inner and the outer face, 'of thesIiding bolt,

the plate F, pivoted to the case and having the opening H, and the slot L, having the angular arm M, and the arm V, pivoted to the bolt S, and having a stud, WV, engaging in the slot of the plate F, whereby said plate is retated to close the key-hole when the bolt is moved by a key inserted in the inner side of 20 the look, substantially as described.

2. The combination, with the case, the sliding bolt, the plate F, pivoted to the case and having the opening H, that registers with the key-hole when the bolt is withdrawn, and the slot L, of the arm V, having a stud entering the said slot, substantially as described.

3. The combination, with the look-case, the bolt having the stud Z, and the tumbler engaging said stud, of arm V, pivoted to the bolt, and the plate F, pivoted to the look-case and connected to arm V, to close the key-hole when the bolt is moved, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

\VILLIAM WALLACE BR-OGA.

\Vi tnesses:

HENRY W. TAFT, CHAS. W. STRONG.

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