US790189A - Electric alarm system. - Google Patents

Description

Nbl-790.l89. E PATENTED MAY-16,1905.

' COOPER.

ELECTRIC ALARM SYSTEM. APPLICATION P ILED'OOT. 15, 19 04.

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. I I I y UNITED STATES Patented May 16, 1905.

PATENT OFFICE.

ELECTRIC ALARM SYSTEM.

SPECIFICATION forming part of Letters Patent No. 790,189, dated May 16, 1905. Application filed October 15, 1904- Serial No. 228,620.

. To all whom it may concern:

Be it known that I, HIrPoLYTE M. CooPnR, a ci-tizenof the United States, residing at Coopers Plains, in the county of Steuben and State of New York, have invented new and useful Improvements in Electric Alarm Systerms, of which the following is a specification This invention relates to electric alarm sys-v terns.

tems; furthermore, to increase their eificiency in operation and to decrease the expense at tending their manufacture and instalment.

With the foregoing and other minor objects in View, which will appear as the description proceeds, the invention resides in an alarm system comprising an initial circuit which includes a plurality of alarm-boxes, each having suitable circuit-breaking means therein, a primary circuit lncludlng novel means for causing the actuation of an alarm, a parallelthereof.

In the accompanying drawing, forming part of this specification, the figure 1s a partly-sectional, partly perspective, and partly diagrammatic view of an alarm system constructed in accordance with the invention.

Referring to the drawing, the initial c1rcuit includes a battery 1, wire 2, magnet 3, and a plurality of alarm-boxes 4, each having a suitable circu1t-break1ng device, such as a energized and permits the armature 6 to drop by gravity into engagement with the contact 7, which is also included in the primary cir- The objects of the invention are to improve and simplify the construction of such syscuit. The primary circuit includes the battery 8, armature 6, contact 7, wires 9 and 10, contact-point 11, contact-spring 12, wire 13, motor 14, and wires 15 and 16. The parallel circuit includes the battery 8, armature 6, contact 7, wires 9 and 17, magnet 18, and wire 19.

' From the foregoing description it will be apparent that the breaking of the initial circuit'by deenergizing the magnet 3 serves to permit the armature 6 to drop against the contact 7, and thus close both the primary and parallel circuits. The motor 14, which is included in the primary circuit, may be of any suitable form and construction; In the embodiment of invention illustrated in the drawing said motor comprises an armatureshaft 20, having thereon a pinion 21, which serves to operate a gear-wheel 22, provided with an eccentrically-disposed pin or crank 23, which operates a sleeve 24, having connected to opposite sides thereof the pistons 25 of air-compressors 26, the outlet-pipes 27 of whichare controlled by suitable oneway or check valves 28, pivoted at 29 and adapted to swing open when air is forced out of the compressors or cylinders 26 and to swing closed immediately after that operation to prevent the reentrance of air upon the suction-stroke of the compressors. The check-valves 28 are located in suitable airchambers 30, which communicate, by means of pipe-sections 31, with an air-supply pipe 32, communicating with a cylinder 33, having therein a piston 34. Arranged in the piping 32 at a convenient point is an electrically-operated valve 35, which is formed with a projection 36,adapted to close the end of an outletpassage 37, extending through the magnet 18. When the parallel circuit is closed and the magnet 18 is energized, the valve 35 is drawn upward so as to close the passage 37 through the magnet 18. Connected with the piston 34 is a piston-rod 38, having thereon a slide-valve 39, formed with an annular groove 40. Upon the outer end of the slide-valve 39 is a rod 41, which is adapted to strike against an insulating-block 42 on the contact-spring 12. Associated with the casing 43 of the slide-valve 39 is a line of piping 44, which leads from asuitable source of steam or other fluid supply and communicates with a steam-whistle 45. The piston-rod 38 is surrounded by a coil-spring 46, which is located within the cylinder 33 and bears against the piston 34, said spring serving to retract the piston when the pressure Within the cylinder is relieved.

Constructed as above described, the operation of the improved alarm system is as follows: It Will be understood that the initial circuit, including the battery 1, wires 2, magnet 3, and alarm-boxes 4, is normally closed, as heretofore explained, whereby the magnet 3 is energized in such manner as to attract the armature 6, thus maintaining the primary and parallel circuits normally open. WVhen an alarm is to be sounded, the knife 5 in one of the alarm-boxes is raised, thus breaking the initial circuit and causing the armature 6 to descend by gravity until it rests against the contact 7. This movement of the armature 6 closes simultaneously the primary and parallel circuits. The primary circuit, through the battery 8, armature 6, contact 7, wires 9 and 10, contact-spring 12, wire 13, motor 14, and Wires 15 and 16, causes the actuation of the motor 14 and air compressors 26, which act to force the air into the piping 32. The closing of the parallel circuit through the battery 8, armature 6, contact 7, wires 9 and 17, magnet 18, and wires 16 and 19 causes the magnet 18 to be energized,with the result that the valve 35 is attracted thereto and the projection 36 effectually closes the outlet 37. The air compressed by the cylinders 26 passes into the cylinder 33 and forces the piston 34 toward the right. As soon as the slide-valve 39 on the piston-rod 38 is moved a sufficient distance to cause the annular groove 40 to register with the piping 44 the steam-whistle is sounded. At this moment the rod 41 strikes against the insulating-block 42 on the contactspring 12 and forces said spring away from the contact-point 11, thus breaking the primary circuit and stopping the operation of the motor, for which reason an excessive supply of compressed air to the cylinder 33 is avoided. The compressed air which remains in the pipe 32 and cylinder 33 is sufiicient to hold the piston in its advanced position, so that the steamwhistle continues to sound. hen it is desired to stop the sounding of the whistle, the initial circuit is closed, thus energizing the magnet 3 and causing the armature 6 to break the parallel circuit by moving away from the contact 7. As soon as the parallel circuit is broken the magnet 18 is deenergized and the valve 35 descends by gravity into its lowest position, thus permitting the air in the cylinder 33 to exhaust through the outlet 37. The coil-spring 46 serves to move the piston 34 back to its normal position, so that the slidevalve 39 stops the sounding of the whistle and the rod 41 permits the contact-spring 12 to move again into contact with the point 11,

thus closing the gap in the primary circuit and preparing it for the next operation of the alarm.

Changes in the precise embodiment of invention illustrated and described may be made within the scope of the following claims without departing from the spirit of the invention or sacrificing any of its advantages.

Having thus described the invention, what is claimed is 1. An electric alarm system, comprising an initial circuit, a primary circuit, a parallel circuit, means controlledby the initial circuit for closing the primary and parallel circuits, means controlled by the primary circuit for causing the actuation of an alarm, means for automatically breaking the primary circuit, means controlled by the parallel circuit for permitting the continued actuation oi the alarm after the breaking of the primary circuit, and means actuated by the initial circuit for breaking the parallel circuit.

2. In an electric alarm system, a normally closed initial circuit, including alarm-boxes, having circuit-breaking means, and a magnet, a primary circuit, a parallel circuit including a magnet, an armature associated with the magnet of the initial circuit, and actuated by the breaking of said initial circuit to close the primary and parallel circuits, a motor connected with the primary circuit, an air-pump operated by said motor, a controlling-valve for said air-pump operated by the magnet of the parallel circuit, a piston operated by the pump, and means connected with the piston for sounding an alarm and breaking the primary circuit.

3. An electric alarm system, comprising an initial circuit, including a battery, a magnet, and a plurality of alarm-boxes having circuitbreaking means, an armature associated with the magnet of said initial circuit, a primary and a parallel circuit connected with said armature, said parallel circuit including a magnet, a motor operated by the primary circuit, a plurality of air-compressors operated by said motor, a cylinder, piping connecting said air-compressors with said cylinder, a valve in said piping operated by the magnet of the parallel circuit, an air-outlet controlled by said valve, a piston in said cylinder, a piston-rod connected with said piston, a coil-spring surrounding said piston-rod, a slide-valve on said piston-rod, a whistle controlled by said slidevalve, a rod connected with said slide-valve, and a contact-spring associated with said primary circuit, and adapted to be struck by said rod.

4. An electric alarm system, comprising an initial circuit, a primary circuit, a parallel circuit, means controlled by the breaking of the initial circuit for closing the primary and parallel circuits, means controlled by the primary circuit for causing the actuation of an alarm, means operable upon the actuation of the alarm for breaking the primary circuit, means controlled bythe parallel circuit for permitting the continued actuation of the alarm, and means actuated by the closingof the initial circuit for breaking the parallel circuit.

5. An electric alarm system comprising three circuits, means actuated'by the first circuit for controlling the other tWo circuits, means controlled by the second circuit for causing the initial actuation of an alarm, and I means controlled by the third circuit for permitting the continued actuation of the alarm. In testimony whereof I aflix my signature in presence of two Witnesses.

HIPPOLYTE M. COOPER. Witnesses:

ABRAHAM GRIDLEY, JAMES J. HOLDSWORTH.

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