US2030279A - Electric signal - Google Patents

Description

FEEL 1936, F. TOSCANO 2,030,279

ELECTRIC SIGNAL Filed April 25, 1934 INVENTOR 1?. Toscano Q aw;

ATTORNEY Patented Feb. 11, 1936 UNITED STATES PATENT OFFICE 3- Claims.

This invention relates to electric signal devices and is directed in particular to an electric: signal of the vibrator type commonly known as a buzzer.

The principal object of my invention is to provide an electric signal of the vibrator type which is adapted to be connected directly with the ordinary light circuit carrying from 100 to 120 volts without the necessity of an intermediate current reduction transformer interposed in the circuit between the ordinary 110 volt current supply line and the electric signal. It is also my object to construct this electric signal so that the current in the push button side of the" circuit will be exceedingly low in order to prevent fire danger and to prevent possible shock to an operator in the event the push button should .be short circuited.

A further object of my invention is to provide an electric signal of the vibrator type which does not have the customary circuit breaker point. 20 This eliminates the necessity of keeping the breaker point adjusted and also eliminates the sparking and flaming which is inherent in electric signals which use a breaker point to interrupt the operative current. A

A further object of the invention is toproduce a simple and inexpensive device and yet one which will be exceedingly effective for the purpose for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawing similar characters of reference indicate corresponding parts in the several views:

signal.

Figure 2 is a longitudinal section looking forward from the back of my electric signal.

Figure 3 is a fragmentary top plan illustrating the relative arrangement of the vibrator armatures and the electromagnetic circuit as employed in my electric signal.

Figure 4 is a diagrammatic circuit as employed in my electric signal.

Figure 5 is a perspective view of the armature unit, detached. I

Referring now more particularly to the characters of reference on thedrawing, the numeral I denotes a base for the electric signal structure adapted to be shielded by a hood 2. A horn member 3 is fixedly and transversely secured on the top of the hood 2 and is extended forward thereof.

Induction coils 4 and 5having extended cores 6 and I are securely mounted in longitudinally spaced and in end to end relation on the base I Figure 1 is a perspective view of my electric by means of straps 8, as shown. A relatively thin sheet of insulating material 9 is positioned between the coils 4 and 5 and the base I in order to prevent any short circuit between the coils. Current supply lines II} and II project through insulation sleeves I2 in the base I and each of said lines connects with the winding of one of the induction coils 4 and 5. Wires I3 and I 4 lead from the winding of each coil out through insulation sleeves I2 in the base I and each connects to a terminal of a push button switch I5.

A bracket I6 with an upstanding leg I I is mounted forward of the coils on the base I. Brass vibrator arms I8 and I9having spring tensionare secured to the leg I I and extend rearwardly between and adjacent to the cores 6 and I. In inoperative position these brass vibrator arms do notcontact the cores but are spaced therefrom. Steel vibrator armatures 20 and 2| a-reriveted to the inner faces of the vibrator arms and extend upwardly from the ends of said vibrator armsthroug'h a slot 22 into the horn 3. This slot 22 allows a relatively free vibrating movement of the upstanding armatures 20 and 2 I.

An auxiliary brass vibrator arm 23 is rigidly secured to the hood 2 adjacent the outer end of the core I. This brass vibrator arm 23 is provided with a steel vibrator armature 24.

The circuit employed is shown diagrammatically in Figure 4. The wire I0 connects the volt supply line 25 with one end of the winding 21 of coil 4, while the wire II connects the 110 volt sup-ply line 26 with one end of the winding 28 of coil 5. The wire I3 extends between the other end of the winding 21 of coil 4 and one terminal of the push button switch I 5, while the wire I4 leads fro-m the other end of the winding 28 of the coil 5 to the other terminal of switch I5.

In operation the circuit is closed by pressing the push button I5. This results in a flow of current through the entire circuit. This flow of current is very weak on the push button side of the circuit and therefore affords practical use of an ordinary low capacity push button switch.

Magnetic induction caused by the flow of the current through the coils causes the cores 6 and I to become magnetized and draw the vibrator arms I8, I9 and 23 towards the adjacent core. The arms however do not adhere and do not remain against the ends of the cores but fly back to normal position due to the relatively small magnetic attraction of the brass arms plus the spring tension of said arms. This movement soon increases to an exceedingly rapid vibration of the armatures and the upstanding steel vibrator armatures 20 and 21 and the auxiliary vibrator armature 24 connected thereto. With the vibrator armatures 20 and 2| extending through slot 22 into the horn 3 the buzz of the vibration of the arms is greatly amplified and broadcast out of the horn as a signal. The auxiliary vibrator arm 23 and vibrator armature 24 also vibrate rapidly and materially add by resonance to the sound produced in the horn 3 by the main vibrator.

The L shape of the armature allows a relatively long armature to be used while maintaining the same within. a compact space. The length of the armature, particularly with respect to the distance of its anchored end from the core of the magnet, permits of relatively short vibratory movements of the outer end of the annature while keeping it normally a distance from the magnet core such as efficient operation requires. Also by reason of the specific form and mounting of the armature and its supporting arm, the vibratory movement of the armature is reciprocatory rather than oscillatory. In other words, the portion of the armature adjacent the magnet core moves the same distance as its outer end, as distinguished from the different degreesof movement of the corresponding points in the usual form of armature. This novel form and mounting has been found to produce a marked increase in sound producing resiliency, with no actual increase in the vibratory stroke at the outer end of the armature.

It will be noted that when the push button switch is not depressed and the circuit is open there is absolutely no flow of electric current through the circuit either in the primary or the secondary windings.

From the foregoing description it will bereadily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets 'forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to :as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention What I claim as new and useful and desire to secure by Letters Patent is:

1. An electric signal comprising an electromagnet, a resilient arm of non-magnetic material extending radially of the magnet in overlapping but spaced relation to one end of the core of the magnet, means anchoring the end of the arm farthest from the magnet, an armature of magnetic material mounted on the arm and projecting radially of the magnet at right angles to the arm from the side thereof opposite the magnet core and normally spaced from the arm, and a horn having an opening adjacent its throat and through which the outer portion of the armature freely projects.

2. An electric signal comprising an electromagnet, an arm consisting of a non-magnetic strip extending radially away from the magnet and at one end facing the adjacent end of the magnet core in normally spaced relation thereto, means anchoring the other end of the arm, an armature of magnet material consisting of V a resilient L shaped strip, one leg of said strip extending along and in spaced relation to the arm from its free end on the side thereof opposite the magnet and being secured at its outer end on said arm and the other leg extending at right angles to the arm, and a signal horn having an opening adjacent its throat, the outer portion of said other leg of the armature projecting freely through said opening.

3. An electric signal comprising an electromagnet, an armature projecting radially of the magnet from beyond one end thereof in facing relation to the adjacent end of the magnet core, a signal horn having an opening adjacent its throat through which the outer portion of the

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