US339750A

US339750A - Door-alarm

Info

Publication number: US339750A
Authority: US
Publication date: 1886-04-13
Anticipated expiration: 1903-04-13

Description

oooooooo l G. G. EDWARDS.

UUUU ALARM.

No. 339,750. 'Patented Apr. 13, 1886.

@51j ZLS' @tHe/aneth] y' UNITED STATES PATENT OFFICE.

CHARLES G. EDW'ARDS, OF RUSHFORD, MINNESOTA.

DOOR-ALARM.

SPECIFICATION forming part of Letters Patent No. 339.750, dated April 13, 1886.

(No model.)

To @ZZ whom it may concern.-

Be it known that I, CHARLES G. EDWARDS, a citizen of the United States, residing at Rushford, in the county of Fillmore and State of Minnesota, have invented certain new and useful Improvements in Alarm Attachments to Doors; and Ido hereby declare that the following is a full, clear, and exact description of the same, reference beingI had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1 of the drawings is a front elevation of a portion of a door and door-frame, showing my invention applied thereto; Fig. 2, an edge view, on an enlarged scale, of the striking mechanism; and Fig. 3, a detail plan view ot the bracket, showing the spring-connection.

The present invention has relation to that class of alarm attachments to doors in which is employed a bell connected by a bracket to the docrframe, and a hammer pivoted to said bracket, an arm upon the door operating the hammer to sound the bell when the door is being opened.

The object of the invention is to improve the construction of the above-mentioned class of alarm attachments; and it therefore consists in the details ot' construction, substantially as shown in the drawings, and hereinafter described and claimed.

In the accompanying drawings, A B represent, respectively, the door and door-l'rame, to the former of which is attached an arm, a, said arm projecting above the door to operate the striking mechanism ofthe bell C, the bell being connected in any wellknown manner to the door-frame.

The striking mechanism consists in part of a bracket, D, otany preferred construction, which is securedtothedoor-frame B, and is provided with ears b. To the ears bare pivoted similar ears, c, of a lever, E, the rod or pin d, which connects the ears together, having coiled around it a spiral spring, F, the extremities ef thereof bearing, respectively, upon the sides of the bracket D and lever E as shown in Fig. 2.

The lever E at one end is bent inwardly toward the bracket to form a stop, z, and thereby limiting the throw of the hammer g when the lever is released by the arm a. This hammer gis secured to the free end of a curved rod, G, the opposite end thereof being firmly attached to the end of the lever E, or near the end, as found desirable. The rod G, as will be noticed, has a serpentine form to increase its efficiency and bring the ham merg in proper position to the bell.

rIhe bracket D, on which is supported the lever E, may be constructed in any desirable manner and provided with holes for the screws, which secure the bracket to the doorframe in a suitable position to have the hammer strike the bell when the door is opened.

When the door is elosed,the end of the rod or arm a bears with sufficient force against the outer end of the lever E to hold the hammer g from contact with the bell C; but when the door is opened sufficiently to withdraw the arm from Contact with the lever, the latter, by the action ofthe spring F, will be thrown out to bring the hammer against the bell with the required force to sound an alarm. When the door is again closed, the rod or arm a, which is brought against the lever, will cause the hammer g to be held from contact with the bell, and thus prevent sounding an alarm when the door is closed.

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

In an alarm attachment to doors, the combination, with a bell and an upwardly-extending arm connected, respectively, to the door-frame and door, of a striking mechanism consisting of a bracket formed with ears, a lever having ears pivoted to the ears of the bracket, a spring coiled around the pivot and having its ends bearing on the inner sides of the bracket and lever, said lever bent inwardly at its ends, as shown, and having attached to it a serpentine-formed rod carrying the hammer, substantially as and for the purpose set forth.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

CHARLES G. EDWARDS.

Witnesses:

W. A. MAHAEFY, W. J. SCHMITZ.