US962687A - Signaling device. - Google Patents

Description

M. J. WOHL & H. HERTZBERG.

SIGNALING DEVICE.

APPLICATION FILED MAE.16,1908.

962,687, Patented June 28, 1910.

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UNITED STATES PATENT OFFICE.

MAURICE J. WOI-IL, OF NEW YORK, AND HARRY HERTZBERG, OF BROOKLYN, NEW

YORK, ASSIGNORS T0 ABBOT A. WOI-IL, on NEW YORK, N. Y., AND TRUSTEES.

LONV, 0F HORSESHOE, NEW YORK; MAURICE J. HARRY HERIZBERG, OF BROOKLYN, NEW YORK,

SIGNALING- DEVICE.

To all whom it may concern:

Be it known that we, Haunrcn J. WoHL and HARRY HERTZBERG, citizens of the United States, and residents, respectively, of the city of New York, borough of Manhattan, county and State of New York, and of the city of New York, borough of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Signaling Devices, of which the following is a specification.

The object of this invention is to produce a signaling device in which an audible signal is caused by the vibration of a diaphragm through the expansion and contraction of a thermal expansible conductor.

To this end, the invention consists broadly in a signaling device having a diaphragm and a thermal expansible conductor connected with said diaphragm and arranged so that the alternate expansion and contraction of said conductor caused by the fluctuations of the current in the operating circu1t vibrates said diaphragm and produce an audible signal.

The invention is illustrated in the accompanying drawing, which shows a longitudinal section through a receiver embodying the novel principle.

In this drawing, 1 is the receiver casin and 2 the diaphragm, both very much as usual.

3 is a thermal expansible conductor or wire, most conveniently disposed longitudinally within the receiver. This wire is of the greatest thermal delicacy, so as to expand and contract slightly under the changes in temperature due to current varlations therein. The usual binding posts 4: are provided for connecting this conductor in the receiver circuit. The conductor 3 is stretched between spring supports 5, to which it is connected by tension adjusting devices 6. The conductor is connected intermediate its length to a short, transversely disposed lever 7; said conductor being connected to this lever at two points at opposite sides of the pivotal axis thereof, so that contraction of the conductor swings the lever in one direction. Said lever is connected with the diaphragm by a wire 8, which may or may not be insulated from the conductor 3. It is to be noted that the spring action of the dia- Specification of Letters Patent.

Application filed March 16, 1808.

Patented June 28, 1910.

Serial No. 421,428.

phragm takes up the slack in conductor 3,

when the latter expands.

In order to prevent the diaphragm being vibrated as a result of expansion and contraction of conductor 3 which are due merely to variations in the surrounding temperature, there is provided a compensating wire 9, which is also stretched between the spring supports 5, being connected thereto by the tension adjusting devices 10. This wire is so selected as to have the same total linear expansion per unit change in sur rounding temperature as the conductor 3. It follows, therefore, that changes in the surrounding temperature will not cause the conductor 3 to swing the lever 7; because the conductor and compensating wire expand and cont-act equally under such condition, and, the compensating wire, being connected only to the spring supports 5, causes these latter to flex one way or the other by just this amount: therefore, the outer ends of the conductor sufli'er displacement, but not the points on the conductor which are connected with the lever. It will be understood that the compensating wire 9 is suitably insulated from the conductor 3, so as to carry no current.

In operation, the current fluctuations within conductor 3 cause the temperature of the conductor to fluctuate, and this in turn creates variations in the length of the conduc-. tor. These slight movements of the conductor 3 are transmitted to the diaphragm through the lever 7 and wire 8; and the resulting vibration of the diaphragm is audible as a signal.

What is claimed as new is:

1. A signaling device comprising a diaphragm, a thermal expansible conductor in the signaling circuit, and mechanical multiplying connection between said conductor and the diaphragm.

2. A signaling device comprising a diaphragm, a lever, connection between the lever and diaphragm, and a thermal expansible conductor in the signaling circuit operatively connected intermediate its ends with said lever.

3. A signaling device comprising a diaphragm, a pivoted lever, connection between said lever and said diaphragm, a thermal expansible conductor connected intermediate its length to said lever at two points at 0pposite sides of the pivot thereof, and supports between which said conductor is stretched.

4. A signaling device comprising a diaphragm, a pivoted lever, connection between said lever and said diaphragm, a thermal expansible conductor connected intermediate its length to said lever at two points at opposite sides of the pivot thereof, spring supports between which said conductor is stretched, and a compensating wire, substantially as described, also stretched between said supports.

5. A signaling device comprising a diaphragm, a thermal expansible conductor in the signaling circuit, connection between said conductor and said diaphragm whereby expansion and contraction of the former due to current variation therein vibrates the diaphragm, and compensating means whereby expansion and contraction of said conductor due to variations in surrounding temperature do not aitect the diaphragm.

Signed at New York in the county of Kings and State of New York, this 12th day of March 1908.

MAURICE J. WOHL. HARRY HERTZBERG. WVitnesses JOSEPH F. GARCIA, GEO. VVELLING GIDDINGS.

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