US675570A - Burglar-alarm. - Google Patents

Description

No. 675,570. Patented June 4, 190i. J. W. ROSENGREN.

BUBGLAB ALARM.

(Application filed Apr. 2, M301.)

2 ShoatsSheet i.

(No Model.)

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UNTTEb STATES PATENT OEEIcE.

JOHN IV. ROSENGREN, OF HYDE PARK, MASSACHUSETTS.

BURG LAB-ALARM.

SL EGIFIGATION forming part of Letters Patent No. 675,570, dated June 4, 1901.

Application filed April 2, 1901.

To aZZ whom it may concern:

Be it known that I, JoHN W. RosENoREN, a citizen of the United States, residing at Hyde Park, in the county of Norfolk and State of Massachusetts, have invented newand useful Improvements in Burglar-Alarms, of which the following is a specification.

This invention relates to improvements in burglar-alarms adapted for use on doors or windows, &c., for the purpose of automatically causing an alarm to be sounded in case burglars or other unauthorized persons should attempt to gain entrance to the premises through the doors or windows, &c., as will hereinafter be more fully shown and described, reference being bad to the accompanying drawings, wherein- Figure 1 represents a front elevation of my improved burglar-alarm shown as applied to a door. Fig. 2 represents a top plan View of Fig. 1. Fig. 3 represents a detail top plan View of the device shown as detached from the door. Fig. represents a section on'the line at at shown in Fig. 3. Fig. 5 represents a cross-section on the line 5 5 shown in Fig. 4, and Fig. 6 represents a cross-section on the line 6 6 shown in Fig.

Similar letters refer to similar parts Wherever they occur on the diderent parts of the drawings.

In Figs. 1 and 2, A represents the door, hinged to the casing B, as usual.

0 represents a block or casing of wood or metal secured in a suitable manner to the casing B. In a cavity in the said block is pivoted upon a pin D a hammer E, provided with a projection e, as shown in Figs. 4 and 5. Said hammer is normally held in the position shown in Fig. 4 by the influence of a suitable spring F. (Shownin said Fig. at.) The head of said hammer is normally held against a yielding spring-pressed pin G, the lower end of which rests upon a yielding spring-pressed pin H, arranged in a perforated metal block I, which is pivoted on a pin K, secured in the block or casing O, as shown in Figs. 4 and 6. The block I is supported upon a cartridgeholder L, which contains an explosive cartridge M. (Shown in Fig. 4.) The said car- Serial No. 54,039. (No model.)

i tridge-holder is pivotally arranged upon the same pin K on which the block I is pivoted.

O is a perforation in the casing 0, below the cartridge M, to allow the gases from the cartridge to escape when the latter is ex ploded.

For the purpose of charging the holder L with a cartridge or extracting the shell after being fired it is only necessary to swing the bydottedlines in Fig. 6. After the cartridgeholder has been charged it and the block I are swung to the normal position shown in full lines in Figs. 4 and 6.

Nis a cover hinged to the front of the block or casing O, and it serves the purpose of inclosing the internal mechanism of the parts arranged within the said block or casing, as shown. On top ofthe said block or casing C is arranged a longitudinally-movable plate 0, which is preferably guided on said block by means of screws P P, passing loosely through slots 0 O in the plate 0 and screwed or 0therwise firmly secured to the block 0, as shown.

To the movable plate 0 is pivoted at q the trigger Q, which is received in a slot ()"in the plate 0, as shown in Figs. 3 and 4.

Intermediate between the under side of the plate 0 and the upper portion of the trigger Q is placed a stop-gate R, which is preferably arranged adjustable in a groove in the upper portion of said trigger, as shown in Figs. 3 and 4.

In setting the device for giving an alarm I insert the stop'gate R between the trigger and under side of slide 0, so as to prevent the triggerfrom yielding when brought in contact with the projection e on the hammer E during the movement of the plate 0 in the direction of the arrow shown in Figs. 3 and 4.

S is a preferably knee-lever pivoted at P to the top of the block or casing O and pivotally connected, by means ofa link '1, to the slide 0, as shown.

To the outer free end of the lever S is preferably journaled a roller S, adapted to lie in contact with the door A, as shown in Figs. 1 1 and 2.

parts I and L outward to the position shown During the day-time or when it is desired not to use the alarm I remove the stop-gate B, so as to permit the door to be swung open whenever {so desired without actuating the trigger Q and hammer E.

To set the device for operation after the door has been closed and locked, I open the cover N and swing the pin-block I and cartridge-holderLoutward to the position shown in dotted lines in Fig. 6, after which I place a. blank cartridge in the holder L and swing the partsI L to their normal positions, (shown in full lihes in Figs. 4 and 6,) after which I close the cover N, as shown in Figs. 4, 5, and 6. If the door should now be opened, the lever Swill be actuated by the door and caused to swing on the fulcrum P in the direction of the arrow shown in Fig. 2, and thereby causing the plate 0 to move in the direction of the arrow shown in Figs. 3 and 4E, and in so doing the trigger Q is caused to come in contact with the projection e on the hammer E, causingthe latterto be swung againstthe influence of its spring F in the direction of the arrow shown in Fig. 4 until the trigger has passed by said projection 6, when the hammer is liberated and caused by the influence of its spring F to strike the pin G, which when striking the pin H causes the cartridge M to be exploded with greatnoise, thereby awakening and alarming the occupants of the house.

In practice I prefer to arrange back of the pin-block I a spring-pressed bolt U, which is longitudinally adjustable in a cavity in the casing O and normally held by the spring V in the position shown in Fig. 6. The inner end of said bolt U is inclined at U in Fig. 6.

The block I may be swung outward when so desired simply by pressing the bolt U inward in contact with the free end of the block I.

The invention is very simple in construction, is very effective in its operation, and may be used in connection with doors, windows, gates, &c., for the purpose hereinabove set forth.

What I wish to' secure by Letters Patent and claim is- A burglar-alarm, consisting in combination, a box or casing, secured to the doorframe and having a spring-actuated hammer arranged within it a pin-block and cartridgeholder pivotally arranged within said casing below the hammer, a sliding plate and a trig ger pivotally arranged thereon, a door-lever pivoted to said casing and to a link connected to the trigger-carrying slide substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JOHN \V. ROSENGRENV \Vitnesses:

ALBAN ANDREN, RICHARD O. ULBRICH.

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