US280578A

US280578A - chesteb

Info

Publication number: US280578A
Authority: US
Publication date: 1883-07-03
Anticipated expiration: 1900-07-03

Description

(No Model.) 2 Sheets-Sheet 1.

W. P. CHESTER. a ELECTRIC BURGLAR ALARM ATTACHMENT FOR AUTOMATIC SIGNALING APPARATUS. A

No. 280,578. Patented Jul 's, 1883.

b: Attdrm gr phar Wasmngton D C (No Model.) A 2 sfiet'hsheen 2.

' W. P. CHESTER.

ELECTRIC BURGLAR ALARM ATTACHMENT FOR AUTOMATIC SIGNALING APPARATUS. No. 280,578. Patented July 3, 1883.

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WILLIAM F. CHESTER, OF NETV YORK, N. Y.

ELECTRIC BURGLAR-ALARM ATTACHMENT FOR AUTOMATIC SIGNALING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 280,578, dated July 3, 1883.

Application filed March 24,1883. (X model.)

T0 at whom it may concern Be it known that I, WM. F. CHESTER, of New York, in the county of New York and State of New York, have invented a new and ImprovedElectrieBurglar-Alarm Attachment for Automatic Signaling Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, and to the figures and letters of reference marked thereon.

My invention has for its object, primarily, to extend the usefulness of the district-messenger system now in such extensive operation in the principal cities of this and other countries by combining with the automatic signaling mechanism employed in such system at each station or call-box a normally-open local circuit, including a battery and an electro-inagnet, extending throughout a building or other place, to be protected and arranged so as to be closed by the opening of a window, door,

' tion.

or blind, or by the unwarranted interference with or trespassing upon any part of the building or place to be protected, and the electromagnet included in said circuit being adapted, upon the closure of the circuit, to actuate the tripping device of the signaling mechanism and set the latter in operation to turn in a .signal at the central office; and it further has for its object the provision of meanswhereby upon the signaling mechanism being set in operation the local circuit will be automatically opened, soas to prevent wastage of the local battery.

The novel features of my invention will be first described, and then pointed out particularly in the claims at the end of this specifica Referring to the accompanying drawings, Figure 1 represents a front elevation of a district call-box containing an automatic signaling mechanism and showing the application of my improvements thereto. Fig. 2 is a sectional view taken on the line 00 00, Fig. 1. Fig. 3 is a sectional view taken on the line y Fig. 1; and Fig. 4., a detail view, showing the gearing of the signaling mechanism.

Similar letters of reference inthe several. figures denote the same parts.

The letter A indicates a metal call-box, containing the signaling mechanism and other operative parts.

B represents the main actuating-shaft of the signaling mechanism, upon which is mounted a disk ordrum, 0, having a peripheral tooth or projection, a, and a peripheral recess or notch, b, and upon which is also mounted a volute spring, D, and a gear-wheel, E, one end of said spring being connected to the shaft and the other end to astationary part at c, and the conneetionbetween the shaft and the gear Ebe ing effected by means of a ratchet and pawl, (not shown,) so that when the gear E is held from rotation, as hereinafter described, the spring can be wound up by the application of a key or crank to the outer end of theshaft D, andwhen, on the other hand, the wheel E is released, the spring will rotatethe shaft and the disk 0 thereon in the direction indicated by the arrow, Fig. 1. The gear E meshes with a pinion, F, on a shaft, F, which shaft also carries a circuit-breaking disk, G, at its outer end, and a gear-wheel, F which meshes with a pinion, H, on a third shaft, H, that also bears an escapement-pinion, H with which engages an ordinary escapement, I. This arrangement of gearing is such as is commonly employed in devices ofthischaracter, the object desired to be accomplished by it being the gradual rotation of the shaft B and its disk 0, as well as the gradual rotation of the circuit-breaking disk G on the shaft F, when the unwinding of presently be explained.

G is a tripping-lever, pivoted at g and having its upper arm,- G-, extending upward and adapted to be normally projected into the recess or notch 12 in the rim 1) of the disk 0, and having projecting from its lower arm, G, below its pivot, a stud, G". A spiral spring, G operates to pull the lower arm of the lever forward and to keep the stud G* in the path of a stud, G, projecting from the side of the disk G. WVhen the mechanism is wound up by the rotation of the shaft B, as aforesaid, the end of the upper arm, G", of the lever stands projected through the recess or slot in the rim of the drum C, while the stud G on the lower arm of the lever rests under the stud G on the disk G, thus preventing the rotation of said disk G, and consequently the rotation of the whole train of connected gearing. When, however, the lower arm, G", is from any cause swung outward, the end of the upper arm will be withdrawn from the slot or recess in the the spring is permitted to take place, as will rim of disk 0, and the stud G will release the stud G and allow the train of gearing to be set in motion. As the disk 0 revolves the end of the upper arm of the lever will bear again st the under side of the rim of said drum, and there remain and slide in contact until the slot or recess in the rim again comes opposite, whereupon the spiral spring G will pull the lower arm of the lever forward, thereby causing the end of the upper arm to pass up into such slot or recess, and the stud G to again move into the pat-h of the stud G and stop the further motion of the mechanism.

J is a metal finger supported on an insulating-block, K, and adapted to bear lightly upon the periphery of the disk G. The main sig naling-cireuit (which is a normally-closed one) comes in at binding-post 1, passes up wire 2 to the metal finger J, thence to disk G, thence through the connected metal parts of the mechanism to the metal casing A, and thence out at terminal or binding post 3, connected to the metal case. It is obvious, therefore, that when the drum G is rotated the main-line circuit will be broken and made as many times as there are notches in said disk, for as the metal finger reaches each notch its point will drop down into said notch and cause a break of the circuit, while upon the engagement of the spring with the disk beyond said notch the circuit will be reestablished, and so 011, the makes and breaks being repeated until the spring finally rests upon and in electrical contact with the smooth unbroken portion of the periphery of the disk.

N and 0 represent two metal spring-arms mounted upon an insulating-block, P, andhaving a tendency to spring apart at their free ends, so as to keep out of contact with each other. From spring N extends a wire, 4, to an insulated binding-post, 5, and from the spring-arm 0 extends a wire, 6, through the helices 7 S of an electro-magnct, 9, to another insulated binding-post, 10.

11 represents a short metal arm, bearing a stud, 12, of insulating material, and pivoted at 13, being limited in its motion on one side by a stop, 14, and on the other side by a stop, 15. The end of arm 11 projects in the path of the projection or tooth a on the disk C of the signaling mechanism, and when the naling mechanism is wound up the said tooth a strikes said arm and swings it against its stop 1 L, as shown in Fig. 1, and causes the insulating-stiul 12 to press the metal fingers N O in contact with each other; but as soon as the signaling mechanism is tripped and the disk 0 started back, the arm 11 gradually falls back to its stop 15, and the metal springs N and 0 spring apart again out of contact. The local protecting-circuit 1.6 is connected to the binding-posts 5 and 10, and includes a battery, 17, and any number of contact-making devi ces -such as 18 and ].9applicd to doors, wi ndows, blinds, &c., of the building or other place to be protected. The continuation of the local circuit through the instrument has already been indicated as extending from binding-post 5, through wire 4, to spring-arm N, to spring-arm O, to wire 6, through the helices of the electro-magnet-9, and thence back again to binding-post 10.

In front of the poles of the electro-magnet S) is an armature, 20,which is secured to thclower end of a pivoted lever, 21, whose upper end overlaps the lower end of the tripping-lever G, though normally held away from the same by the tension of a suitable spring, 22.

All the parts of the apparatus having been new described, its operation will. be readily understood. \Vhen the apparatus is set for operation, the parts are in the position shown in Fig. 1., the signaling mechanism being wound up and held in check by the trippinglever G, and the spring-arms N O in the local circuit being held in contact. When, new, the local circuit is closed, by the bringing together of the contacts 18 and 19, for instance, the cores of the electro-magnet 9 will be magnetized and will attract their armature 20, thus causing the lever 21 to rock the trippinglever G and set the signaling mechanism into operation to turn in a signalat the central oifice. As the disk C of the signaling meclr anism rotates, its tooth a releases the short pivoted arm 11, and the latter drops down upon its lower stop or stud, 15, thus releasing the spring-arm 0 from contact with the arm N and opening the local circuit. From this it will be seen that the closing of the localjcircuit by a burglar, or from any other cause, will send a call for assistance to the central oflice, and as soon as the signaling a )paratus has been set in motion it will automatically open the local circuit again, and thus prevent wastage of the local battery.

Having thus described my invention, I claim as new 1. The combination, with an automatic signaling mechanism and a tripping device for holding the same in check, of a local protecting-circuit, including a batteryzandxan electro-magnet for releasing the tripping device upon the closing of the local circuit, and means operated by the signaling mechanism for antomatically opening the local circuit again to prevent wastage of the local battery, substantially as described.

2. The combination, with an automatic naling mechanism and a tripping device for holding the same in check, of the local protecting-circuit, including the battery and the clectro-magnet for releasing the tripping device upon the closure of the local circuit, the spring-arms in the local circuit, the pivoted lever normally holding the said spring-arms together, and the tooth on the disk of the naling mechanism operating uponthe pivot ed lever, substantially as described.

\VILLTAM F. "IlESlER.

\Vitnesscs:

llIELVIL'LE CHURCH, Faun F. (/H'I RCl-I.