US1562947A - Electromagnetic device - Google Patents

Description

A. J. EAVES ELECTROMAGNETIC DEVICE Filed April 21, 1923 Nov. 24 ,4 1925- 1362,94?

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AUGUSTUS J. EAVES, OF GSSIITING, NEW YORK. ASSIiNOR TO WESTERN ELECTRIC COMIANY, INCORPORATED, OF NEW" YORK, N. '51, A CQEPGRATION OF NEW YORK.

ELECTROIVIAGNETIC DEVICE.

Application filed April 21, 1323.

To u/l /10/11 i/ may concern:

Be it known that I, iiuo'usrus J. Eiivns, a citizen of United States, residing at ()ssinlug, in the county of ld estchester, State of New York, have invented certain new and useful Improvements in Elcctromagiietic Devices, of which the following is a full, clear, concise and exact description.

This invention relates to electromagnetic devices and particularly to polarized telegraph sounders.

An object of the invention is the provision of a new and improved form of polarized sounder which has few and simple parts and which is reliable and eflicient in operation.

In accordance with the preferred form of the invention, a simple and etlicient means is provided for insuring the maintenance of a uniform high reluctance path between a permanent magnet and the core of an electroniagnet.

Referring now to the drawings, Fig. 1 is a side elevation of the invention in its prehrrrcd form. Fig. 2 is an end view of the structure of Fig. 1.

In accordance with the showing .in the dra wing, the polarized sounder comprises abase 7 on which there is mounted a plate 8 which is attached to the base 7 by means of screws Sl t). Mounted on the plate 8 is a pair of electromagucts 1010. Each of these clectromagnets is provided with a'soft iron core 12 having its lower ends formed in the shape of pole-pieces 13-13. Suitable screws are provided for clamping the polepicces and the electromagnets to the plate 8.

Also mounted on the plate 8 is trunnion yoke Il/l carrying a trunnion 15 supporting a sounding bar 19. Carried by the top of the trunnion yoke id is a projection having at its free end an aperture in which an adj usting screw 17 is threaded. To the adjusting screw 17 and titted in a notch in the sounding bar 19, is a lIialan-cing spring 18 which seiwes to balance the movement of the sound ing bar 19 with respect. to the associated permanent magnet. Intern'iediate the ends of the sounding bar 19 and just above the cores 12 of the electromagnet 10-10 is fired to the sounding bar 19 an armature 20, which is attracted due to the magnetization induced in the cores upon the passage of a current through the windings of the electro magnets which have their ends connected to Serial No. 633,629.

terminals 1111. Also carried by the sounding bar 19 is an adjustable screw 21 which is provided with a lock nut for limiting the downward travel of the sounding bar 19.

Also secured to the plate 8 is an anvil 22 which, like the sounding bar 19, is provided with an adjustable screw -13 with a lock nut for limiting the upward travel of the sounding bar 19.

The cores of the electromagnet are polar ized by means of a permanent L-shaped magnet 2st. The magnet 24: is mounted just above the pole-pieces 13 and has interposed therebetween a spacer 25 which in the preferred form of the invention is of non-magnetic material such as brass. The permanent magnet 24L is secured to the pole-pieces 13 by means of non-magnetic screws 26. The thickness of the spacer 2.5 varies with the operating current of the circuit over which it is desired to operate the sounder and the strength of the permanent magnet. It has been found that for a current of substautially 6 mile the thickness of this spacer should be approximately For other operating currents the thickness of the spacer 25 will of course vary. The provision of a spacer 25 and the manner of mounting the permanent magnet 24; insures the maintenance of a uniform high reluctance path between the permanent magnet and the pole-pieces 13 which is essential in the satisfactory and eliicient operation of such devices. Itis also to be noted that the mounting of the permanent: magnet 24.- in the manner just described not only insures a uniform high reluctance path between the permanent magnet and the pole-pieces, but also increases the resonant mass of the sounder. Such an arrangement in'iproves the quality and. the clearness of the tones emitted upon the operation of the sounder.

The invention claimed. is:

1. In a polarized sounder, a base, an. electromaguct carried by said base having cores with pole-pieces secured thereto, a permanent magnet secured to the pole-pieces, and a nonmagnetic spacer interposed between said permanent magnet and pole-pieces for maintaining a uniform high reluctance path between it and the pole-pieces of the electromagnet.

A polarized sounder, comprising a base, an electromagnet mounted thereon having cores With pole-pieces secured thereto, a pen said permanent magnet and said pole-pieces for insuring a uniform high reluctance path between it and the cores of the electromagnet.

A polarized sounder, comprising a base, an eleetromagnet mounted thereon having a core with pole-pieces, an L-shaped perinareeaea'z' ucut magnet rigidly secured to said polepieces, and a strip of non-magnetic material interposed between said permanent magnet and said pole-pieces for insuring a uniform hi gh reluctance path between it and the cores of the electroinagnet.

In Witness whereof, I hereunto subscribe my name this 19 day of April, A. D. 1923.

AUGUSTUS J. EAVES.

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