US296420A

US296420A - James a

Info

Publication number: US296420A
Authority: US
Publication date: 1884-04-08
Anticipated expiration: 1901-04-08

Description

(No Model.)

' J. A. MALONEY.

I RECEIVING TELEPHONE.

-No.296,420. Pa iqnted Apr.8,1884.

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NITED STATES PATENT OFFICE.

JAMES A. MALONEY, OF WASHINGTON, DISTRICT OF COLUMBIA.

RECElVlNG-TELEPHON E.

SPECIFICATION forming part of Letters Patent No. 296,420, dated April 8, 188%.

Application filed October 26,1883. (No model.)

To all whom it may concern:

Be it known'that 1, JAMES A. MALoNnY, of Washington city, in the District of Columbia, have invented certain new and useful Improvements in Receiving-Telephones, of which the following is a specification.

My invention has relation to that kind of receiving-telephone in which are combined a magnet, a nonmagnetic diaphragm, and a reed-like armature fastened to the diaphragm. It is my object to obtain a simple and efiicient instrument of this kind. lhe improvement is characterized by the combination, with the magnet and the nonmagnetic diaphragm, of aspecial form of armature which, for convenience sake, I term a multiple-reed armature, consisting of two or more reeds or strips, which have their free ends opposed to and separated by a short interval from one another, and are formed in one with a supporting-plate which is fastened tightly to the diaphragm. With an instrument of this kind speech can be reproduced distinctly and with accuracy.

In the accompanying drawings, Figure 1 is a longitudinal central section, partly in elevation, of a receiving-telephone embodying my invention. Fig. 2 is aperspective view on enlarged scale of the multiple-reed armature detached.

The case A of the instrument is of non-conducting material and of the usual form. \Vithin it is the core B-in this instance a permanent magnet-on the front end of which is the helix 0, connected, as usual, to line by wires m y. The ear-trumpet A is closed by a nonmagnetic diaphragm, D,which can be conveniently made ofpine veneer secured by its edges in the case.

Attached to the inner face of the diaphragm, so as to be opposite the pole of the magnet, (or poles, in case a horseshoe or equivalent core be used,) is the multiplereed armature E. This device is made of soft ironusually strapiron-and consists of a strip of proper length whose ends are bent up and then folded inward, so as to approachone another nearly, without, however, touching. The armature, as shown, has the form approximately of a quadrangle, and this is the form which I find most convenient and on the wholeprefer, although the formmay be varied to some extent without departure from my invention. is essential is that there should be free ends, constituting tongues or reeds, which are opposed to and separated by a short interval from one another, and that these opposed tongues or reeds should be carried by or formed in one with a supporting strip or plate common to both. In the armature shown the part a may be considered the base, the parts I) the reedsupporting standards, and the parts 0 c the free ends, or reeds proper. I prefer to slot longitudinally each free end, as indicated at d, so as to form two reeds of each, and it is this arrangement, which in practice I have found productive of the best results; but the ends may be unslotted, in which case each of them will constitute but a single reed, and, on the other hand, more than one longitudinal slot may be formed in them, in which case each would consist of more than two reeds ortongues but in any event the free extremity or extremities of the reed or reeds 0 would be opposed to that or those of c. The armature is secured rigidly to the diaphragm D by a screw, 6, which passesthrough thediaphragm andahole,

What

a, in part a, and a nut or washer, f, which is screwed down on the projecting inner end of the screw.

Having described my improvements and the best way known to me of carrying the same into effect, I state, in conclusion, that I am aware that a reed-like armature secured to a nonmagnetic diaphragm or sounding-board is not new in a telephonic receiver, and this I do not claim.

What I do claim as new and of my own in vention is The combination, in a receivingtelephone, of a non-magnetic diaphragm, a magnet, and a multiple-reed armature, under the arrangement and for operation substantially as hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 26th day of October, 1883.

. JAMES A. MALONEY.

Witnesses:

EwELL A. DICK, J. WALTER BLANDFORD.