US1704511A

US1704511A - Electromagnetic vibrating device

Info

Publication number: US1704511A
Application number: US106372A
Authority: US
Inventors: Theodorus H Nakken
Original assignee: MEYER NATHAN LEIBOWITZ
Current assignee: MEYER NATHAN LEIBOWITZ
Priority date: 1926-05-03
Filing date: 1926-05-03
Publication date: 1929-03-05
Anticipated expiration: 1946-03-05

Description

March 5, 1929. T. H. NAKKEN ELECTROMAGNETIC VIBRATING DEVICE Filed May 1926 2 Sheets-Sheet March 5, 1929. T. H. NAKKEN ELECTROMAGNETIC VIBRATING DEVICE Filed May 1926 2 Sheets-Sheet IN E/VTOR x/4 H a Aim A V w ATTORNEYS Patented Mar. 5, 1929.

UNITED STATES PATENT OFFICE.

'rnnonoiws n. NAKKEN, or JERSEY CITY. NEW JERSEY, ASSIGNOR TO mum. num- TENBEBG AND MEYER NATHAN LEIBOWITZ, on NEW YORK, 11. Y.

ELECTROMAGNETIC VIBRATING DEVICE.

Application filed May 3,

This invention relates to electromagnetic devices for effecting vibrations in accordance with variations of an electric current.

Mechanisms of this kind for. eiiecting the vibration of a single member, such as a diaphragm of a telephone receiver or of a loud speaker for wireless telephony, are well known, and comprise, for instance, an armature pivotally mounted between double pole pieces of a magnet, such armature either being associated with a coil, through which the electric current flows, in which case the magnet is of the permanent variety, or being in the form of a permanent magnet, in which case the magnet, between the pole pieces of which such armature is mounted, is associated with a coil through which the electric current flows, so that the magnetization thereof will vary according to the variation in the strength of the cur rent.

The object of the present invention is to provide a device of this kind which is especially adapted for imparting vibrations to a plurality of members, such as, for instance, the cone of a loud speaker for wireless receivers or the like, and the diaphragm of a horn which may be combined in a single unit with such cone.

This application of the device, however, is given merely by way of example, since the device could be used for other purposes than operating two diaphragms associated together in a loud speaker.

The device, according to the present invention, comprises a plurality of pivoted armatures extending between the poles of a magnet, and a coil or coils connected in the circuit of said electric current, associated with such device, and adapted to control the magnetic interaction between the armatures and the poles of the magnet.

In order that the invention may be clearly understood, reference is made to the accompanying drawings which illustrate by way of example, three embodiments of my invention, and in which Figure 1 is a. diagrammatic view in elevation of one form of the device;

Figure 2 is a diagrammatic view in plan of the armatures of this device;

Figure 3 is a diagrammatic view in elevation of a. modified form of the device;

1926. Serial No. 106,372.

Figure 4 is a diagrammatic view in elevatron of a further modified form of the device;

Figure 5 is a plan view of a preferred form of the invention;

Ifigure 6 is a front elevation of this form; and

Figure is a sectional elevation taken on line VII-VII of Figure 6.

Referring to Figures 1 and 2 of the draw-- in gs, a is a magnet which may be an electro-- magnet excited by a constant current, or a permanent magnet. The poles of this mag-- net, as clearly shown in Figure 1, are bifurcated, thereby forming two upper poles b 6 of one polarity, and two lower poles 0 c of the other polarity. Two armatures (Z (Z are floatingly held side by side between the poles of the ma net, with their ends extending respectively %etween the pole pieces 6 0 and b 0 The mounting of the two armatures preferably comprises a fiat spring 6 extending transversely of the armatures and attached to them in any suitable manner intermediate their ends. The ends of the flat spring 6 are anchored in anv suitable manner, but preferably in a bobbiii f or the like, surrounding the centre portions of the two armatures, and upon which is wound a coil 9 through which the variable electric current is adapted to flow.

The two armaturcs extend longitudinall side by side, but are separated from eac other a slight distance, so that. there will be no frictional contact between them. One end of each armature extends beyond the pole pieces, and to such extensions are connect d rods 72), if, which are also connected respee--- tively to the members to which vibrations are adapted to be imparted. The rods or the like h, if, may be connected respectively at opposite sides of the device or at the same side of the device.

\Vhen the varying current flows through the coil g, the armatures d (1 will be magnetized, the magnetization thereof varying according to the strength of the current. Owing to the variation in the magnetization of the armatures, interaction between the ends thereof extending between the pole pieces will vary, and the armatures will vibrate in accordance with the variations in the strength of the current flowing through the coil 9.

These vibrations will be transmitted by means of the rods 71. if, to the members which are to be vibrated.

Referring to Figure 3 of the drawings, the two armatures al d illustrated therein, are mounted end to end instead of side by side, and their ends extend between the triple pole pieces of the poles of the magnet a. In such a construction, of course, each armature is mounted upon a separate spring 0 e and each is influenced by a separate coil g 9 which may be connected in series or parallel.

Figure 4 illustrates a further development of the idea embodied in Figure 3. In the construction according to this figure, the central pole pieces 6 c of the construction aeeording to Figure 3 are substituted by double pole pieces b, 6 and 0, 0 Otherwise, the two constructions are the same.

The construction illustrated in Figures 5 to 7 of the drawings is substantially the same as that illustrated in Figures 1 and 2 of the drawing, but in this construction the parts have been assembled in a more compact form.

As clearly shown in these figures, the armatures d, a? are pivotally mounted between the poles of the permanent magnet by being connected to the spring e, which is anchored at its ends, preferably as in the former construction, in the bobbin f-upon which the coil g is wound. The rods if, 713', are connected respectively to the armatures d d", on the same side of the device. The permanent magnet a comprises the two pairs of pole pieces 6 b and c 0 extending respectively downwardly and upwardly from the bridge pieces is, Z, which extend in opposite directions, and are connected to the yoke m. Such magnet may be formed of a single casting, or the bridge pieces, with the pole pieces extending therefrom, may be bolted to the yoke piece m, or connected thereto in any other suitable manner. A

By providing two diaphragms which can move independently of each other, the two members to be vibrated will be actuated without the vibrations of one member affecting the vibrations of the other. This would not be the case if the two members were connected to the opposite ends of a single armature. since, with such a construction, there would necessarily be interaction between the two members, owing to their direct connection with each other through the armature; and, consequently, each of such members would not have a separate natural period of vibration, but the combined unit would have a natural period of vibration, depending upon the individual natural periods of vibration.

The construction according to the present invention entirely overcomes this disadvantage, since the two members being allowed to vibrate independently of each other, the natural period of vibration of each will not be effected. Consequently, if the device were used for operating the diaphragm of a horn and the cone of a loud speaker combined in a single unit, the diaphragm and the cone would each be vibrated without the one acting as a load upon the other, and each would retain its normal characteristics.

As previously stated, however, the invention could be used for other purposes than the operation of the diaphragm of a horn and the cone of a loud speaker combined in a single unit.

The armatures, instead of being pivotally mounted intermediate their ends, may have their forward ends extending between the two poles of a magnet, and be pivotally mounted at their rear ends, such armatures being floatingly held in an intermediate position between the poles by springs or the like, or by being themselves of resilient material and having their rear ends anchored.

It is also obvious that further modification of the forms illustrated may be devised without departing from the spirit and scope of the invention as defined in the accompanying claims.

I claim- 1. An electromagnetic device for effecting vibrations in a plurality of members in accordance with variations in an electric current comprising a plurality of armatures floatingly mounted between the poles of a magnet, a single member to which both of such armatures are connected and by which they are floatingly supported between said poles, and means associated with the circuit of said electric current and associated with such device adapted to control the magnetic interaction between the armatures and the poles of the magnet.

2. An electromagnetic device for efl'ecting vibrations in a plurality of members in accordance with variations in an electric current, comprising a magnet having opposed poles, a plurality of armatures extending side by side and floatingly mounted between said poles, means for floatingly supporting such armatures between such poles and means associated with the circuit of said current and associated with such device ada ted to control the magnetic interaction etween the armatures and the poles of the magnet. 3. An electromagnetic device for effecting vibrations in a plurality of members in accordance with variations in an electric current, comprising a plurality of armatures extending side by side, means for connecting said armatures to said members, a magnet having opposed poles between which the armatures are floatingly supported, means for floatingly supporting said armatures between said poles, and means for magnetizing said armatures by said electric current whereby the magnetization thereof will vary in accordance with the variations in the electric current.

4. An electromagnetic device for effecting vibrations in a plurality of members in accordance with vibrations in an electric current, comprising a magnet having each pole divided into two pole pieces, a plurality of armatures extendin side by side, floatingly mounted between t e poles of the magnet, with their ends extendin between the opposed pole pieces, means or fioatingly sup porting such armatures between such pole pieces, and means for magnetizing said armatures in'accordance with the variations in said electric current.

5. An electromagnetic device for effecting vibrations in a plurality of members in accordance with vibrations in an electric current, comprising a magnet having each pole divided into two pole pieces, a plurality of armatures mounted upon a sprin extending transversely of the armatures, and having its ends fixedly supported, such armatures extending side by side with their ends extendtending transversely thereof, and havin its ends anchored, such armatures havin t eir ends extending respectively between t e opposed pole pieces of said magnet, and means associated with the circuit of said electric current and associated with such device, adapted to control the ma etic interaction between said armatures an said pole pieces.

In testimony whereof I afiix my signature.

THEODORUS H. NAKKEN.