US595963A

US595963A - David wiley mccaughet

Info

Publication number: US595963A
Authority: US
Publication date: 1897-12-21
Anticipated expiration: 1914-12-21

Description

(No Model.)

D. W. MGGAUGHEY. ELECTRIC BURGLAR ALARM.

No. 595,963. Patented Deo. 21,1897.

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UNITED STATES DAVID VILEY MGCAGHEY, OF CHICAGO, ILLINOIS, ASSIGNOR OF SEVEN- TENTHS TO MARION L. SOMERS,

JONES, OF SAME PLACE.

EUGENE R. COX, AND XVARNER E.

ELECTRIC BURGLAR-ALARWL SPECIFICATION forming part of Letters Patent No. 595,963, dated December 21, 189'?.

Application filed November 27,1896. Serial No. 613,585. (No model.)

To @ZZ whom t may concern.:

Be it known that I, DAVID `WILEY MC- CAUGHEY, a citizen of the United States, residing at Chicago, Cook county, Illinois, have invented certain new and useful Improvements in Electric Burglar-Alarms, of which the following is a specification.

The object of my invention is to provide a simple, economical, and efficient electric burglar-alarm; and the invention consists in the features, combinations, and details of construction hereinafter described and claimed.

In the accompanying drawings, Figure 1 represents my improvements in diagrammatic form as attached to a swinging door; Fig. 2, a .longitudinal sectional view of the contact and inclosing mechanism, shown detached from the door, with the circuitbroken, and taken on line 2 of 4t; Fig. 3, a similar view to that shown in Fig. 2, showing the parts in engagement with each other and the circuit closed; and Fig. et, a full-sized end view of either one of the parts.

In the art to which this invention relates it is well known that the usual terminals or contact-points are not protected in any manner other than by insulation, so that ordinarily the insulation can be drilled through, a short circuit made, and the door or window opened without sounding an alarm. My invention is intended, primarily, to obviate this objection and provide a simple and economical electric burglar-alarm the contact-points or terminals of which are protected not only by insulation, but by an armor, so that they cannot ordinarily be tampered with without destroying the circuit.

In constructing a burglar-alarm in accordance with my improvements I make a terminal A and secure it to an insulated wire a, which I mount in a block B, formed of vulcanized rubber, iiber, or other insulating inaterial. One end of this block is provided with a hardened-steel sleeve B', that surrounds the same and protects such end from being drilled in the ordinary manner. These two parts-the insulated block and the end sleeve-are ordinarily formed in one integral. piece, though it is not necessary that it should be so, as they can be iitted together loosely.

I mount this insulating-block and its sleeve in a metal thimble C, that is provided with a face-plate portion c, having holes or perforations c' for wood-screws, by which it may be secured to a door or other part with which it is intended to be used. Between the shoulder formed by the end of the sleeve B and the inner end of the thimble I insert a helically-coiled spring D, that normally acts to keep the contact-point at its outermost limit, as shown in Fig. 2, but will permit of the parts being pressed inwardly and below the surface, as shown in Fig. 3, thus forming a cushion for the contact-point. This thimble is inserted in one end of a hardened-steel tube E, which tube may be placed in the door, as shown in Fig. l of the drawings. The other end of the tube is provided with an insulating-plug G, having an adjusting-screw g axially entering the same, which screw is connected by means of a wire II with a source of electric energy. The inner end of the insulated wire that connects with the terminal is formed into or provided with a helical spring a2, bearing a metal platen a3 on the end thereof, so that when the parts are in the engagement shown in Fig. 3 the platen is forced up against the adjusting-screw, and thus acts to complete the circuit. y

Both of the terminals are constructed exactly the same, with the exception that one of the terminals A2 is sunk below the outer protecting-sleeve, so that when the parts are together, as shown in Fig. 3, they are almost entirely protected,and its block provided with a limiting-shoulder a, Collars h2 limit the movements of the insulated blocks, as shown in Fig. 2 of the drawings. In placing the thiinbles in position a hole' e2 is bored in the door and a rather stift helical spring inserted in the same. The terminal, with its inclosing armor, is forced down against the tension oi this spring and secured in position, the action of the stiff spring' being such that when the securing means are removed it serves to force thc terminals and incasing armor out sufficiently to obtain a hold of the same and remove it from position.

Referring to diagrammatic view of Fig. l, when the parts are in the position shown in IOO this gure the main circuit is broken and the armature-lever I pulled over against the stop t', so that an auxiliary circuit is formed and current flows from the battery J through Wire l0, alarm l1, wire l2, stop i', armaturelever I, and back by wire 13 to battery, soundingy an alarm and giving' notice that' the main circuit is interrupted or broken. lVhen the door is closed, the terminals will occupy the position shown in Fig. 3 and the main circuit be closed, so that current flows from the battery through Wire II, through terminal E, thence through terminal E2, through Wire 14, through electromagnets 15, and back by Wire 1G to battery. This energizes the electromagnets l5 and pulls the armature-lever over against the same, thus breaking the auxiliary circuit. The auxiliary circuit is provided with a switch-lever 17, so that such circuit may be broken or completed Whenever desired.

lVhile I have described my invention with more or less minuteness as regards details and as being embodied in certain precise forms, I do not desire to be limited thereto unduly any more than is pointed out in the claims. On the contrary, I contemplate all proper changes in term, construction, and arrangement, the omission of immaterial elements, and the substitution of equivalents, as circumstances may suggest or necessity render expedient.

I claiml. In an electric burglar-alarm, the combination of a terminal or contact point, a longitudinally-movable insulating-block in which it is mounted, ahard metallic sleeve for protecting one end of the insulating-block, and an outer hard metallic tube in which the parts are mounted for protecting the same, 4o

substantially as described.

2, In an electric burglar-alarm, the combination of a terminal or contact point, a longitudinally-movable insulating-block in which it is mounted, a hard metallic sleeve secured to one end of the insulating-block to protect the same, a thimble in which the insulatingblock and sleeve are mounted, spring mechanism inserted between the thimble and the insulating-block to keep the block With its terminal point at an outer limit, and an outer encompassing hard metallic sleeve, substantially as described.

3. In an electric burglar-alarm, the combination of a terminal or contact point, a lon gitudinally-movable insulating-block in which it is mounted, a hard metallic sleeve secured to one end of the insulating-block to protect the same, a thimble in which the insulatingblock is mounted, a helical coiled spring inserted between the thimble and the bloclr` to normally hold the insulating-block at its outer limit ot motion, an outer encompassing hard metallic sleeve for holding the parts in position and protecting the same, an insulatingplug` in the end of the tube opposite the terminal point, an adjusting-screw connected with the circuitwire in such insulating-block, and a cushioning-spring on the inner end of the terminal wire arranged to contact the adjusting-screw and close thc circuit when the parts are in their inner position, substantially as described.

DAVID 'WILEY llICCAUGIlEY.

Witnesses:

THoMAs B. McGuire-ort, THOMAS F. SHERIDAN.