US708327A - Door or window alarm. - Google Patents

Description

'No. 708,327. Patented Sept. 2,1902.

ms. E BEBSTEIN. 000R 08 WINDOW ALARM.

(Application filed June 3, 1901.)

2 Sheets-Sheet I.

No. 708,327. Patented Sept. 2, I902.

J. G. EB'ERSTEIN.

DOOR 0B WINDOW ALARM.

7 (Application filed June 3, 1901.) (No Model.) 2 Sheets-Sheet -2.

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llnrr nn rains ATENT FFlGEt JOHN G. EBERSTEIN, OF CHICAGO, ILLINOIS, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO JOHN J. HOVEY, JOHN F. DEAN, AND R. ADAM BRACHVOGEL, OF CHICAGO, ILLINOIS.

DOOR OR WINDOW ALARM.

SPECIFICATION forming part of Letters Patent No. 708,327, dated September 2, 1902.

Application filed June 3,1901. Serial No. 62,977. (No model.)

To all whom, it may concern:

Be it known that 1, JOHN G. EBERSTEIN, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in Door or Window Alarms, of which the following is a specification.

My invention relates to door and window alarms automatically set off by the opening of the door or window whereto the alarm is adjusted; and the objects of my invention are, first, to provide an alarm which shall require no fixtures, but which may be easily adjusted and removed, and, second, to provide an alarm of simple construction and positive action. I attain these objects by the mechanism illustrated in the accompanying drawings, in whicht Figure l is a face or front view of the com plete device. Fig. 2 is aperspective View illustrating the manner of adjusting the alarm to a window. Fig. 3 is a face view of the device, showing the bell removed for the purpose of exposing the interior mechanism. Fig. 4 is a face view of the chief members of the releasing mechanism. Fig. 5 is a rear view, with the casing removed, showing the mainspring; and Fig. 6 is a transverse sec:

tional view taken on the line 66, Fig. 3, looking in the direction of the arrows.

Similar characters refer to similar parts 7 throughout the several views.

a represents the central plate, whereto the framework of the device is attached and stitutes a part of the gear-frame, being rigidly secnred to the central plate 0.. Between lets m m upon the escapement-lever- 11.

By means of the said plate h and the main or first gear-wheel g is a ratchet 2', rigidly attached to the arbor Z) and detained by the pawlj, pivoted to the frame-plate h. When the bell d has been screwed tight upon the threaded extremity of the arbor b, if the frame-plates a and 7b are held stationary the further rotation of said bell causes the said arbor b to be rotated in the frame of the device, and said arbor is prevented from rotating backward on account of the operation of said ratchet and pawl. Now the main gear-wheel g, sleevef, and oasing 6 rotate as a single piece, and as the gearwheel g is prevented from escaping by certain devices attached to the main frame and hereinafter described it follows that the rotating of the arbor b winds up the mainspring c in the casing e. In other words, when the main gear 9 is held fixed in the main frame and since the casing c and gear 9 are rigidly connected and also since the mainspring is con nected at one end to the said arbor and at the other to said casing c it follows that the rotation of the arbor b will wind up the mainspring, so that the casing will tend to rotate so as to unwind said spring when the gear 9 is permitted to rotate in the main frame. The escapement mechanism whereby said gear g is controllably permitted to rotate in the main frame will now be described.

The escapement-wheelkis revoluhlymounted upon a suitable arbor in the main frame and is normally detained by means of the pal- Said wheel k is connected by a train of gearing 0 0 with the wheel g,and the mainspringc therefor tends to drive said escapement-wheel 7c.

The hammer p is connected to the lever 91 by the arm q, and the parts are so related that when the pivoted lever 77. is not detained the force of the escapemeut-wheel 7c acting upon the pallets m 172 will drive said lever,so as to rock upon the pivot thereof and permit the intermittent revolution or escapement of said wheel 70. The rocking or vibration of said lever 11 causes the hammer to make a series of strokes upon the bell 61, thereby sounding an alarm.

The device for preventing the vibration of the lever 02 consists of a slotted detent r, havin g a tongue 5-, adapted to engage said lever. A pin 25 penetrates through said detent 1" into the plate a and forms a guide for permitting a limited travel of said detent. By means of the spring u, acting upon the detent 1, said detent is normally held so as to engage and prevent the vibration of the lever it. Near one extremity said detent has an arm 1;, extending transversely thereto and passing through a suitable aperture provided in the plate a. Said arm is screw-threaded to engage an extremity of the controlling-rod to. When said controlling-rod forces the detent r away from the lever 71, said lever is released and permits the escapement of the wheel 7c.

Inclosing the spring 0, casing e, and adjacent parts is the lower casing 00, which is dish-shaped and attached at its periphery to the central plate (t by means of the tongues y g on said casing which enter the notches a z on said plate. The controlling-rod to projects a considerable distance beyond the casing 00 and is preferably pointed at its outer extremity, as shown, for better sinking into the wood of the door or window whereto the device is to be adjusted. An arm 1 is attached to the lower casing 00 and has a turnedup portion 2, apertured in such a manner as to form a guide for said rod to. Said arm 1 is also provided with the sharpened prongs 3 3 on the opposite side of the lower casing for sinking into and engaging parts of the floor or window. As the prongs 3 are secured to the main frame of the device and the rod '10 is secured to the detent 4, which is movable therein, it follows that the movement of said rod relatively to said arm 1 operates said detent r, and thereby controls the operation of the device.

My invention is applied and used in the following manner: When it is desired to call attention to the unauthorized opening of a window, the prongs 3 3 are placed upon the upper ledge of the lower sash and the point of the rod w is caused to engage the side of the upper sash, but in a loose manner, so that p the rod to is projected, and the detent 7' prevents the vibration of the hammer 19. When the device is adjusted in this manner, as illustrated in Fig. 2, it is evident that either the attempted raising of the lower sash or lowering of the upper sash will cause the rod to to be forced into the framework of the device, thereby causing the sounding of an alarm in the manner above described.

It is within my conception that my device may be adjusted with certain adaptation to objects other than doors and windowsas, for example, drawers sliding within chests or casings.

WVhat I claim as new, and desire to secure by Letters Patent, is

1. In a burglar-alarm, a shell comprising two bowl-shaped parts having their concavities adjacent and their peripheries approximatelycontiguons, the upper one of said parts constituting an alarm-bell; a central plate socured to the lower of said shell part-s and extending across the device from the peripheries of said shell parts; an arm fixed to and extending in both directions from said lower shell part, one end of said arm having prongs for engaging an exterior object, and the other end of said arm having a turned-up portion perforated to form a guide; a main arbor mounted in and extending through said central plate, and secured at one end to said bell; a pulsative device inclosed between said central plate and said bell for sounding the latter; a spring-casing inclosed between said lower shell part and said central plate, said spring-casing being connected to said main arbor for driving said pulsative device; a spring connected at one end to said arbor and at the other end to said spring-casing; a plate slidingly mounted on said central plate and constituting a detent for controllably retaining said pulsative device; and a controllingrod secured to said detent, said rod extending through the perforated turned-up guide portion of said fixed arm, and said controlling-rod having means for engaging an exterior object.

2. In a burglar-alarm, the combination of a main framework, a mainspring casing, a main arbor, a mainspring secured at one end to said casing and at the other end to said arbor, an alarm-bell attached to said arbor for winding said spring, a ratchet-and-pawl device connecting said arbor and the main framework for preventing the accidental improper release of the mainspring, a pulsative esoapementdevice geared to said mainspringcasing for sounding said bell; a detent operating upon said escapement, said detent having a slot for receiving a guide-pin and having a transverse arm passing through an aperture in the central plate of the main frame, and said detent being slidably mounted upon said central plate and making contact therewith for the greater portion of the length of said central plate thereby affording a firm bearing for said detent; a controlling-rod secured to the transverse arm of said detent upon the side of said central plate opposite to the major portion of said detent; said rod having means for engaging an exterior object and prongs fipon said framework for engaging a second exterior object whereto the device is adjusted.

JOHN G. EBERSTEIN.

Witnesses:

R. A. BRAOHVOGEL, SADIE WOLF.

ITO

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