US2516214A - Telephone substation ringer - Google Patents

Description

July 25, 1950 'J. F. HOUDEK, JR

TELEPHONE SUBSTATION RINGER 5 Sheets-Sheet 1 Filed May 16, 1946 FIG. 2

I NVENTOR: JOSEPH F. HOUDK,JR. BY

ATTORNEY July 25, 1950 J. F. HOUDEK} JR 2,516,214

TELEPHONE SUBSTATION RINGER Filed May 16, 1946 3 Sheets-Sheet 2 FIG. 4 Ii J I :i 2 3 4 @e 3 0 jNON-MAGNETIC 9 IO 7 II 9 11 FIG. 6 4 D 8 3x I I II B i a INVENTOR: JOSEPH F. HOUDEK,JR.

ATTORNEY Jul 25, 1950 J. F. HOUDEK, JR

TELEPHONE SUBSTATION RINGER Filed May 16, 1946 FIG. l2

FIG. l4

3 Sheets-Sheet 3 FIG. I 5

luyeuron: JOSEPH F. HOUDEK,J R.

BVW

ATTORNEY Patented July 25, 1950 UNITED STATES PATENT OFF ICE TELEBHONE SUBSTATIONRINGER Joseph .F. Houdck, Jn, =Chicag0,-Ill., assignor to.

Kellogg; Switchboard and Supply Company, Chicago; 111., a; corporation oflllinois,

ApplicationzMay'lfi, 1946; Serial No. 670,265

41Claims.

'Ihis ainVention relates; to telephone substation. ringersi Its principalobject is atoprovidea sim-. pleaand reliable. constructionlwhich permits-ring ersto beiproduced. economically-audio be readily adjusted to.meetoperating.requirements.

A further object isztoprovide. for. amaximum interchangeability-of parts between tuned and none-tuned ringersstoifacilitate the manufacturingof ringers of the: .two types.

Astillfurther object is. to provide a. suitable mounting arrangementsfor. ringers.- which transmits a minimum of clattenincidentmto.armature. operation. while holding: the ringer sufficiently rigid that the intended.operation.thereof,,.particularly if: atuned-ringer; is notimpaired.

One feature of the invention is that adjustment: oi. the. assembled ringer. is] accomplished: by sliding the. electromagnetsandthe polarizing. mag.- net with respectto the armature.

Another. feature isthat the samexbasic assembly canbe completedasanon tuned ringer. or as. as. a .tuned. ringer,..according. to -whether one armature assembly or anathema-employed.

Other objects andfeatures ofithe invention will. become apparent asthe description. progresses.

Of. the accompanyingdrawings,Figs. l.t0. 11- show. a non-tuned. ringer accordingto -thelinvens tion while Figs.- 12' to. 16 show attuned.ringer.-ac-

cording to. the. invention..

Fiigs; 1: and.2 are:respectively:a.top view and; a

rear view.- of' the. now-tuned ringer: mountedlon a supporting ,base. plate.-.

Fig. 3 is a side sectional view.of.'thedevice of. Figs. 1- and 2. taken generally along :line. 3--3' of Fig.. 1.

Figs. 4, 5, ,6;.andi7. are respectively a frontview, a. topv view,, a. rear view; and; a side .view of. the foundation assembly oftheringer showndn Figs. 1 to. 3".

Figs;. 8,. 9,. 10, and 11 are respectively. a. front. view,.a.to.pv view,. arear. view; and.a side view of: the. slidably adjustablemagnetassembly; shown. with .the coils. of. the electromagnetsremoved.

Eigs. .12. andla are respectively. a topiview and. areanview of. atuned'ri'nger according to the in--- vention.

Fig. 1A is: a siddsectional. view taken: generally, along the line l4--l [of-Fig.- 121'.

Figs; 15 and 16 are respectively airearview and. a: bottom view of" the armaturei-clapperassembly of 'the ringer'of Figs. 12 to 14.

Referring first to. Figs. 1-. to 11,.thenon-tuned ringer illustrated thereinzwillibeidescribed. This ringer may be furtherdescribed'as a biased ringer in thatthe armatureisbiasedlto standfnormally in association with one electromagnet, as shown. Itincludesthe. foundation assembly of Figs. 4120 7 and .parts mountedthereon. Thefoundation as.- sembly comprises-parts 2 and. 4 secured together, as by rivets 31. Part2 comprises a mounting strap of relatively thin and comparatively springy materiahwhile part 4 isa non-magnetic foundationi plate towhich the other parts going to make up theringer. are attached.

In Figs. 1 to 3, the complete ringer. is shown. mountedon baseplate l, which has raisedbosses. (Figs.- 2 and 3) ,tapped to receive mounting screws. l3.-. All. parts. ofthe ringer are thus held out of. direct. contacttwith base plate. I, such contact as. exists between the ringer and base platebeing by way of. the comparatively thinand flexible mounting strap 2.- Direct transmissionof clatter, incidentto thev armature of. the mechanism striking the. ends. of the electromagnets, and incident. to the clapper striking the gongs, is materially reduced by. this simple illustrated. strap mounting.

Foundation plate 4 is. provided at the front with. arms,5,.tapp,ed to receive screws mounting genes 14 respectively thereto. Tab 6 isturned up. at the frontof. the structure and is tappedas shown best in Fig. 4 to-receive adjustment screw 4|...

The rear portion ofplate 4 has a portion sheared and struck up therefrom to provide upstanding wall portion 8, supportingthe rearwardly extending horizontal portion 9, ending intab II]. A hole. is provided through part 9 and through the underlying main portion of founda tion plate 4 to receive pivot rod32 for mounting.- armature 30.

The armatureassemblyof the device of. Figs. 1. to 3 includes armature 30 which has upper and lower ears 3l,. pierced. toreceive pivot rod 32. The upper ear 3i. is sheared and struck up fromthe armature, leaving an opening in (the armature. throughwhich the rearwardly extending part 9. ofl'foundation assembly 4 freely passes. Armature 30 is. provided with non-magnetic core.en.- gaging members 33, applied in .the form of rivets. Their well-understood function is to reduce. the tendency of the armature to freeze in either. of. its two extreme .positions.

The rear end of clapper rod 34 is suitably upset to provide anenlarged portion throughwhich it is secured to the armature, as by riveting. The clapper 35 is mountedon the front end of the rod 34 in aposition to strike the gongs I4 alternately as the armature turns back and forth about pivot. rod 32;

As previously. noted; the non-tuned ringer is illustrated as being of the biased type. To this end, it is provided with bias spring 36, comprising a round reed forced into a hole in armature 30, the front end entering an eccentric opening in adjusting member 31. Spring 36 thus exerts a normal force on the armature causing it to return to the illustrated position after every use thereof, whereby, when in normal position, it is not affected by current flow in a given direction.

One special advantage of the disclosed arrangement resides in the magnet assembly which is longitudinally adjustable as a unit to regulate the stroke of the armature. This magnet assembly includes electromagnets having cores 25. and windings 40, permanent bar magnet 24, and the common yoke 2| of magnetic material. This assembly is shown in four separate views, Figs. 8

short of the end of cores 25, whereby the bar magnet does riot directly contact armature 3|] in any position of stroke adjustment, whereby the intendedmovement of the armature cannot be interferediwith incident to the sliding of the magnet assembly for stroke adjustment.

P Accurate" and' readily controlled longitudinal to 11, with coils 40 removed from their cores 25.

The coils 4| it may be explained, comprise separatespools slipped over cores 25 of the assembly shown in Figs. 8 to 11.

Referring particularily to Figs. 8 to 11, magnetic yoke 2| has a horizontal part, which overlies foundation plate 4 in assembled position, and a vertical part which is pierced to receive the shouldered front end of electromagnet cores 25. These cores may be held to part 2|, as by the illustrated spring washers, or speed nuts? 26, each Of which has inwardly extending parts which snapinto an annular groove in the reduced end portion of its core 25. Cores 25 are thus held yieldingly, whereby sliding of the assembly is not materially afiected by minor displacement of the location of receiving holes H in the upstanding rear portion 8 of foundation plate 4.

Thefront' end of permanent bar magnet 24 enters an accurately sized opening in the upstanding portion of yoke 2|. This opening is produced. by a shearing action which provides the rearwardly extending central tab 23, which underlies the front end of magnet 24. Parts 23 and 24; are held rigidly together as by welding.

fYoke 2| is provided with a front tab 22 which is t apped and threaded to receive the reduced forward portion 42 of stroke-adjusting screw 4|. The main upstanding portion of yoke 2| is pierced at 2 1 to receive the reduced portion of rotatable bias-adjusting member 31.

.In the complete assembly of the ringer, as is illustrated in Figs. 1 to 3, cores 25 of the magnet assembly shown in Figs. 8 to 11 are provided with coils 4|], and bias-adjusting member 31 is applied. Member 31 has an enlarged portion which lies behind the principal upstanding part of yoke 2|, and a. reduced portion which passes forwardly through hole 21 (Figs. 8 and in yoke 2|. The reduced portion of member 3'! is grooved annu-. larly, as seen best in Fig. 3. to receive the arms of hi' furcate spring member 38 which holds part 31 in its assembled position, and retains part 31 by friction in its desired rotational position of' adjustment. The enlarged rear portion of bias-adjusting member 31 is provided with a longitudinal off-center opening receiving the forward, end,

positioning of the slidable magnet assembly, according to the armature stroke desired, is obtained by the illustrated compound stroke-adjusting screwhaving a threaded section-4| and a; reduced threaded section 42. Section 4| threadedly received'in'an opening in upstanding tab 6, formed integrally with foundation'plate 4, while the reduced portion 42 is threadedly received in upstanding tab 22, formed integrally with magnetyok'e 2| of slidable magnet assembly. Preferably-parts 4| and Marc both threaded in the same direction; right-handed, for example. one of the parts, however, is provided with coarse, or's'teeply pitched, threads; the other part is provided with fine, or mildly pitched, threads. It is preferable that-{the larger section 4| be provided with the coarse threads, and that the smaller"'sect'iofi' 42*be provided with the fine threads.

With lock nut 43 loosened, stroke-adjusting screw 4 I can 'beturned'readily to cause it to travel bodily forwardly, orbodilyrearwardly, according to whether the stroke is to be decreased or is to be increasedf As' the screw turns and travels in either direction," theslidingmagnet assembly, by virtue of the finer threads on part 42 and in its cooperating tapped'opening in part 22, travels in the same direction, but a lesser distance. A dif fe'rential action is thusobtained which depends upon the difference in pitch of 'the threads between the two sections. This difierential action permits a fine adjustment of stroke to be obtained. Another'important advantage of the arrangement reside's'in its extreme simplicity, re quiring only tapped and threaded partsto accomplish the purpose.

' During adjustment, the rear end of the slidable magnet assembly is maintained in alignment with the remaining pa'rts of the assembly by virtue of the alignmentbfscrew 4| in its threaded open-Q ings. when the'adjustm'ent has been completed, locknut 43 can be tightened against tab meek ing' thepa'rts in 'their; adjusted position and hold: ing the rear end of the magnet assembly more rigidly in alignment independent of such loose-' ness there ma be in the threaded parts. If desired, tabffirnay be inclined to the rear, caus ing screw, 42tote'nd to slope downwardlyto ard the, rea Wi h .th s a n m t thermherent fiexibilit'yof the'parts causes the horizontal portion of yoke2| to closely hug the top sur iace of foundationplate 4, thereby keeping the parts tightly pressedtogether during, and after, adjustment. g p n ,Figs. '12 to 16, showing a' tuned ringer accord.- l is tQ.th flin e t nii i owbe described!- L'E s- 2v to. s w 'h ih s ,o Figsi0 .3 modified to act is ruined ringer. In Figs. 12 to 14; the-armatureassembly' for" the nonetunedi ringer has been: removed: and replacedi by" the arniature assembly shown in Figs. and 16':- Additionally, parts- 37 and 38 have -been removed, as they are notneededi in. the tuned'ringer;

To remove the armature assembly from the ringer-"of Figs. 1 to 3', itsuffi'ces to remove pivot rod 32 and to withdraw armature 38; together With the attached parts 3 to 36' ma'ki'ng upthe armature assembly;

Thearmature assembly of Figs. 15 and 16 is next pl'aced'in the: position shown in Figs: 12'- to 14 andis held operatively in that position through themedium of its rearwardly extending reed We, clamped between spacer blocks I08, Fig; I3, clamped in" turn between parts I09 and" III] byscrews III. I

Referring particularly to Figs. 15' and l6,- armature I38 is formed, with theoutlineshown in" Fig; 15, of flat stock having a thickness as shown in Fig. 16. Aperture I115 in the armature is for the purpose of receiving upper tab S-attac hed to foui'idation plate 4. Flat reed Mi l is maintained in assembled position with armature IOI; bybeing riveted between rearwardly extendingp tabs I56, there being one such tab for each half portionof the armature.

In the manufacture of the: armature; a piece is first punched. havingthe generalcontour deshed for the finished product, butwith the lower arms. (belowaperture. M5) for enough apartthat retaining tabs Hi8 may be turned up therefrom. Then the portion of the armature lying above, and alongside, aperture N is bent cdgewiseto bring the innerfaces of the formedtabs lflfi'close enough together to snugly receive reed I94 as illustrated.

Reed I94 and tabs H36 are pierced to receive retaining rivets IEl'i. Clapper rod 32 is upset and secured toarmature lill as discussed hereinbefore in-connection with parts 30. and 34. Rod IE2 is provided-with clapper N23 for. striking the gongs I4! alternately, the clapper being. s-lidably secured on red: It2,.as by the indicated-:set-screw, to facilitate tuning/of the armature assembly after installationnin the ringer.

. It-is well known that a tunedringer'must respond to but a single one of several frequencies incident to selecting the desired station on a called telephone party line. For example, frequencies of approximately 16, 25. 33, 50, and 66 cycles may be used on the same telephone party line: Aringer for use at any station onsuch line must be tuned accordingly; In. the illustrated construction, reedv we may have a thickness (varying for example from .910 inch to .022 inch) corresponding to the particular frequency for which it is to be tuned, or to a frequency band within which it is to be tuned to a particular frequency. The reeds for all frequencies, or frequency bands, may be of the same length and width. Armature lIlI may be formed with the tabs Ifiii slightly closer together than the thickness of the thickset reed, the insertion of such reed causing a slight spreading. A reed of certain intermediate thickness may just fit between tabs ills, while the thinner reeds fit loosely between the tabs until rivets Ifil are inserted and tightened, which operation draws the tabs together to result in the desired assembly.

Reed Hi l is pierced at the rear end to receive the shanks of screws Hi. These screws are passed through parts llll, Hi8, and ltd, and are threadedly engaged in locating block I09, which 6? bears against therside portionsof. parts land 1% (see Figs. Sand '7'); whereby it islocated'laterally; It is? lo'cated'longitudinallyof the-ringer by beingg slid forwardly into engagement withthe shoulders. in whichparts "land I end.

Clamp plate H6. is similarly located in order that'therear end of reed- I04 be held firmly in its predetermined position located byparts I09 and HE). Clamp plate: H8 is substantially thinner. than locating block IE9;.and'the-combined thick-- ness of reed; IM and of the two spacer blocks I08= is 1 somewhat less than the width oi locating? tabs 1 and iii; Accordingly, when screws III are drawn. up tightly, clamp plate Hilris thereby'bent inwardly. to assume the illustratedbowedappear; ance as: parts N's; Hi4, I68; and ItQ-are brought tightly together. By this. arrangement, reeds of: theseveral required. thicknesses maybe accommo dated; the part I Ill being bowedmore or less, according to the thickness of the reed.

To provide a ringertuned'to'any desired frequency; an armature assembly havingareed I04 of suitable thickness is selected; and aclapper I03" having a suitable mass is selecte'dand placed approximately in the location shown in Figs; l2'and" 14; The magnet assembly is next adjusted-longitudinally, by stroke-adjusting screw' l I, 4-2;.toprovide a preliminary stroke gap according to the frequency in question. Then, with operating current flowing throughthe windings, the location of clapper when clapper rod I02 isadjusted to the point giving the most vigorous response, whereupon the set screw is tightened firmly-to hold' the clapper in that location. Commercial tolerances in thickness of the reed'material'necessitateproviding 'clappers I83 of varying weights for. any frequency to which the ringer may be tuned. Therefore; the clapper first selected-mayhave to be replaced by-cne, of a different mass to secure the desired tuning adjustment.

It is customary; iollowingthe tuning operation; to adjust the sensitivity of the ringer to the end that the" ringer shall operate reliably responsive to the minimum" current likely to be supplied thereto of the frequency for which it'is tuned, and shall failto respond to the maximum current likely to be supplied thereto at any" other frequency. This. sensitivity adjustment is readily accomplished by turning, screw 41, 42 to thereby varythe air gap betweenarmature IOI and cores 25, orthe electromagnetssuch air gap being determinative of the stroke of the armature. The sensitivity varies inversely with the stroke.

When. thestroke adjustmentfor sensitivity has; been. accomplished, the. eccentrically mounted gongs l4 may be rotated to such a position that they are struck with about equal force by clapper I03 during operation of the ringer, the striking of either gong being accomplished by a slight overthrow, permitted by the flexibility of clapper rod I02, following the striking of the concerned core 25 by armature I 0 I Attention is called to the fact that parts such as 33 (used on armature 30) are not required on armature "H, for reed I 04 can be depended upon to return the armature reliably to its illustrated neutral position.

I claim:

1. In an electromagnetic device, two electromagnets, an armature, a foundation structure, means for adjustably mounting the magnets for longitudinal movement on the foundation structure, the foundation structure comprising a fiat non-magnetic plate having an intermediate section thereof struck up and formed to provide an upstanding portion and a further portion supported thereon and turned rearwardly to overlie therear portion of the plate, said overlying portion and the portion overlaid thereby cooperating to turnably support the armature therebetween, with the armature having an opening therethrough freely receiving said further portion of the foundation structure, with the armature thus extending around and beyond the said further portion of the foundation structure.

2. In an electromagnetic device, two electromagnets, an armature, a foundation structure, meansfor adjustably mounting the front end of the magnets for longitudinal movement of the magnets on the foundation structure toward and away from the rear end thereof, the foundation structure comprising a flat non-magnetic plate having an intermediate section thereof struck up and formed to provide an upstanding portion and a further portion supported thereon and turned rearwardly to overlie the rear portion of the plate, said upstanding portion having openings therethrough receiving the rear end of said magnets respectively to support and guide such end thereof incidental to the said movement of the magnets, said overlying portion and the portion overlaid thereby cooperating to turnably support the armature therebetween in operative relationship with the rear end of said magnets, with the armature having an opening therethrough freely receiving said further portion of the foundation structure, with the armature thus extending around and beyond the said further portion of the foundation structure.

'3. In an electromagnetic device, a plate-like foundation structure, two electromagnets and an intermediate permanent magnet secured together at the front end of each to comprise an E-shaped magnet structure, an upstanding armature located at the rear of the foundation structure and extending thereacross, means for adjustably mounting the front end of the magnets for longitudinal movement on the foundation structure toward and from the armature, the foundation structure comprising a fiat non-magnetic plate havingan intermediate section thereof struck up and formed to provide an upstanding portion and a further portion supported thereon and turned rearwardly to overlie the rear portion of the plate, said upstanding portion having three openings therethrough associated respectively with the middle portion and the two end portions of the armature receiving the rear end of said magnets to support and guide such endthereof incidental to the said movement of the'magnets, said overlying portion and the portion overlaid thereby cooperating to turnably support the armature therebetween for movement about a vertical axis, with the armaw ture having an opening therethrough freely receiving said further portion of the foundation structure, with the armature thus extending around and beyond the said further portion of,

the foundation structure.

4. In an electromagnetic device, two electromagnets, an upstanding armature, a foundation structure, means for adjustably mounting the magnets for longitudinal movement on the foundation structure toward and from the end portions respectively of the armature, the foundation structure comprising a fiat non-magnetic plate having an intermediate section thereof struck up and formed to provide an upstanding portion and a further portion supported thereon and turned rearwardly to overlie the rear portion of the plate, said upstanding portion being perforated to receive said magnets and to guide the said movement thereof, said overlying portion and the portion overlaid thereby cooperating to turnably support the armature therebetween along the vertical median line thereof, with the armature having an opening therethrough freely receiving said further portion of the foundation structure, with the armature thus extending around and beyond the said further portion of the foundation structure.

JOSEPH F. HOUDEK, J-R.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 252,497 Mott Jan. 17, 1882 686,007 Shoemaker Nov. 5, 1901 710,946 Butlingham Oct. 14, 1902 935,792 Jensen Oct. 5, 1909 1,014,125 Craft Jan. 9, 1912 1,106,655 Kaisling Aug. 11, 1914 1,125,490 Dean Jan. 19, 1915 1,293,387 Erickson Feb. 4, 1919 1,831,037 Scott Nov. 10, 1931 1,995,457 Kvaal Mar. 26, 1935 2,209,382 Blattner Mar. 10, 1937 FOREIGN PATENTS Number Country Date 148,516 Germany June 19, 1903 316,876 Great Britain Aug. 14, 1930 522,493 Great Britain June 19, 1940

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