US1118925A - Harmonic ringer. - Google Patents

Description

J. ERIGKSON. HABMONIG RINGER. APPLICATION FILED nov. so, 1908.

I'HE NORRIS PETER: um. PHOTO-LITHQ. WASHINGTON. D C.

' UNITED STATES PATENT OFFICE. J

I JOHN RIOKSON, OF CHICAGO, ILLINOIS, AssIGNOn T0 AUTOMATIC ELECTRIC l COMPANY, oFcHIcAGo; ILLIN0IS,IA CORPORATION or ILLINOIS.

' IIAnMoNIc RINGER.

To all whom it may concern I Be it known that IQJOHN Erickson, a

citizen of the United States of America, and resident'of Chicago, (look county, Ill1 bratory armature and striker the provision I of improved means for holding the said strikerunder spring tension; .the provision of improved means for adjusting the vibratory period of'saidstrikerthat"is' to say, for tuning the same to respondto a certa n frequency of current; the provision of an' improved arrangement whereby fiat spr ngs and certain other 'featuresfheretoforeemployed are'not necessary, the provision of improved means for ad ust1ng the polepieces of the ringer; and the provision of certain details and features ofimprovement and combinations tending to increase the efliciencv, of a ringer of this particular char acter." f

To the foregoing and other useful 'en'ds, my invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings Figure 1 is a front elevation of an electric ringer embodying the principles of my Invention.

Fig. 2- is a detail View illustrating the I method of mounting the armature of the ringer. Fig. 3 is a, horizontal section on line 3-3 in Fig. 1. Fig. 'Ais' a detail sectional view illustrating the method of adjustably mounting the pole-pieces of the ringer. 1 I w As thus illustrated, my invention comprises an upper bracket-plate A upon which are mounted the gongs B, the said plate being adapted to be secured upon the box or casing of a telephone, or upon any other support. Posts a aresecured to thesaid bracket-plate, and to the lower ends of these posts there is secured an armature mounting C which is preferably of brass or other diamagnetic material. The said mounting Specificajtion of Letters .Patent.

PatentedDec. 1 1914.

" Application filed ane-r 0, 190s. Serial No. 465,021.

is provided at front and rear with depending portions 0, and its upper flat portions are secured by screws 0 tothe upper ends of the magnet cores D. Between the said mounting (J and the upper ends ofthe magnet cores there are clamped the polepiece's E, the same being held in place by "the saidscrews, and also by means of the rotatable cams or eccentric pins 6, as shown more clearly in Fig. 4. WVhen the sorewsc' are loosened, then these cams or eccentrics e, which have their larger diameters adapted to rotate. in round openings in the mounting C, may be rotated to cause the twopolepieces E to move toward or away from each other, it being observed that this gives I a very delicate and nice adjustment. The

opening in the pole-piece E which is engaged by the smallerdiameter of the cam e 1s m the form of a transverse'slot, so as to allow this pinto have a lateral motion with respect to thep'ole-piece. Thepole-piecesE I arepreventedfrom moving sidewise by the overturned edges ofthe mounting C. The armature Fis provided'with knife edges 7 which rest in V-shaped notches in the portions 0, and the upper end of said armature isprovided with a striker f, which latter is disposed between the two 'gongs; The" lower end of said armature is provided with an eye 7 to which is attached the upper end of a coil spring G, as illustrated.

The lower ends of the magnet coils are connected together by a yoke H of paramagnetic material, and to this yoke is attached the lower end of a permanent magnet I, whereby the upper pole-pieces of the magnet are polarized in the well-known manner. A screw I J extends upwardly through the central portion of the yoke H,

I and has its upper end provided with a hook to which is fastened the lower end of the spring G, as showninore clearly in Fig. l. A thumb-nut j is applied to the said screw and adapted to bear upon the under surface of the yoke H, whereby the tension of the spring G may be regulated at will, asby rotating the nut 9' one way or the other. A split collar y" surrounds the upper cylindric portion of the nut j, and is provided with a screw y' for clamping the same thereon, whereby the collar and the nut become solid current to cause the e armature dlsposed between he fore 'oin construction and arg ment 1!: W111 be eat a 0 Illinois, this 25th day'of N0V., JOHN ER Witnesses:

f ALBOT G. MARTIN, nu {Ann D. FALES

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