US1279854A - Automatic electromagnetic switch. - Google Patents

Description

i0. F. FOHSBERG. lAuoM/Tc ELEcTRoMAGNETIc swncH.

rAl'mlcnlwlou msn uma, larsl 1 ,27 9, 854.- Patented Sept. 24? 1918..'

UNITED STATES oscar. r. nonsense, oF'roNKEns, NEW

PATENT OFFICE.

YORK, A'SSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

AUTOMATIC ELECTROMAGNETIC SWITCH.

Specification o! Letters Patent.

Patented Sept. 24, 1918.

Application filed December 8, 1916. Serial No. 135,777.

To all whom it mfzy/fco-nccfmr:

Be it-known that'l, OSCAR l?. I1`onsnnim, a. Icitizen of the United States, residing:` at Yonkers, `in tb'e county of VVcstchgstfcr and State of New York, have inventwl certain Inew and useful Improvementsy in Autonmtic Electromagnetic Switches. o1' whiclrtbe following is a full, clear,foni:ise, land exact description. v i

This invention rvlnles to automatic "elec-v tromagnetic switches.

The object of the invention is to provide a rotating switch of the character described to quicklykind effectively connect and disconnect ci rcuits or parts ofjcircuits by a uniform str-p oradvance movement, and' which shall automatically'return to al'norrnal position .wl-lenits restoring 'circuit'js closed.-

Tbe `switch is providediwitha pluralitytion of a. switch'enibodyiiig the 'principles of this invention.y y v i The structure and' operating details of the switch will be more readily understoodV from a consideration ofthe followin'glde'seription: .A yokt ir Ufshaped member 1', which may be a metaA punching', supports' on brackets 2 brush shaft, a A channllrplate 4 is fas- Aals tened by its-sides across the open end ofthe ke 1 andssupports' one end of the magnet il whose otherl` end is fastened to the-'closed end 5 of the yoke1., ,Tbe arn'iature 6 of magnet M lisa .fiat plate pre-vided with lugs 7 -which areb'ent atri h.'- angles 'on either side d A 4.. holes in, these lugs? and in lugs 8 at the botof the bottoni of tie armature. Through 4tom of the open end 0f yk? 1 ril-ns the'fliin e `9., pivotally supporting;

the armature. forward movement o .the amature is restricted 'by the ends o fk'tlie yoke 1 .a4 inst which it restgwhen pulled up. Its ack ward movement islimited by the pin 10 projecting from tbe-plate 11,

At the bottoml of its closed'end a portion oftheyoke 1 is bent to-,form'theprojection 12.' 0n the lower side of this are piled a l small `Zbar 13 and contact springs 14, I5, '16 and 17. Thecontact springs are separated by layers of insulation, and the pile 'may be heldtogether by a screw 18. A

sprinff 19 is stretched from the lower arm of Z-liar 13 to a projection 2() on back lug 7 0f armature 6 to normally holdithe arnnv ture retracted. A portion of the armature is bent to forni the lever 21, at the end of` which is a collar of insulating material This collar rests on one endof spring 1.3, and when the armature is pulled up breaks the Contact between springs 14 and 15.

AThe brush shaft El carries a collar` 23 which muy be rigidly attached by a set screw or other means, not shown. The back end of the collar is enlarged into a diskin whose edge teeth 24 are cut. Alpawl 25 is pivoted on a pin '26 which is carried by-lugs 27 ,of armature 6. A spring 28 holds the pawl in engagement with-teeth 24,.while a lug 29, carried by' the armature, serves to "prevent the fall ofthe pawlbeyondthe control of spring 28 in case of'weakening of-the spring. An arm 30 is bent from the closed end' of yoke 1 into a position such thatitaw-illlimit the forward movement ofthe pawl25 upon the energization of the magnet M: to thev amount necessary to rotate the brush shaft 3 through an arc subtended by a sin'gle tooth 24. A spring 45, fastened on the arm 30, rests on the teeth 24 and prevents retrograde movement ofthe brush shaft.

On thebrush shaft 3 behind collar 23 is a collar 31 also ri idly held to the shaft. Pressed between co lar 3l and a nut 32 are two strips of insulation, and between these strips is a thin metal disk which carries brushes 33. ln the embodiment of the invention herein disclosed, these brushes are positioned at opposite ends of a diameter of the disk. and are two in number, but any desirable number could be provided. A metal feed plate 34, extending-overan-arc of approximately 180 degrees, is 'insulatedly mounted on/the rear bracket 2 in a position such that the lower brush 83 will wipe over it and that one of the'brushes will 'bei'n contact with it in every position of thelawitch. The o'ther brush will wipe over the contacts 35, which are arranged in a `semi-circular bank, and will rest squarelyNona -lcontact whenever the switch is va'treS-t; Thus vthe feed plate will be successiilyiconnected through the brushes to each contact as the brush shaft is ,rotated in response to the `36 to a -plate 37. The 'plate 37 may be a 16 and 17, and normal position is reached.

"r'ests at `the righthand upper end of the metal punching, and has its upper` end drawn so as to resent an annular rim lSvwhose `t'ront guriaeo is parallel to the plane of the brush disk and brushes Il?. The contacts 35 are clamped between layers of insulation to the rim 38 by an annular strip 39. 'lhe ends of theI contacts may be bent baek over the edge of the rim 38,asshown in Fig. 2, for convenience in connecting the terminals of the circuitsI associated ther with. The terminal coniTectedwith the feed plaie. 2H may be attached to ththig\ 4`0. provided on the feed plate for that purpose.

bell-crank lever 4-1 set just inside the front. side of the yoke 1 has at its lower end a yoke 42, the rear end of which carries a lug 46. The lever is pivoted on the pin 9, which runs through the lug;` 46 and the lower end of the, lever itself. The yoke 42 carries on itsl lower side a piece. of insulation which rests ou the. contact spring 16. This spring 16 is stift" and by its pressure on the Yoke 42 holds the lever t1 against a projection 43, which hns been made by cutting outand bending inward a piece of the yoke 1.- A cam 44 tixed at the front end' of the collar 23 on lfii'iish shaft'l will; by its bent portion ateither end, engage the lever 41 twice in each revolution of' the brushes; W'hen so engaged the lever 41 will press the spring 16l vdown so as to connect it. withv spring 17. The no rmal position of the switch is that. inV which one brush rests on lthe last conta'et to the left.- and the other feed plate. 'l`he cam 44 is adjusted so that when vthe ln'usheslare inthis positionfit will engage lever l1 and close the contact. sin- ings 16 and 17.

`The switch as a. -wholefmay be'mounted on a frame.' not shown, by-attaching to it the plate 37 in anysuitablemanner, and.

when so mountedtheyoke 1' and all parts carried by 4It -maydm readily removed by sinlplytakmg out the screws Elli which hold tho platel l1l to the. plate 37, such.removalI not, necessitatinganydisturlmnee of the' rontact bank or its .associated terminals.

'lbo switch may be used as; a -eounter jor register, its magnet. being intermittently eliergtzed m accordance wlth .;the number of,

eont'aets it. is desired to bareiswopt over before. a circuit. is completed from the -t'eedA plato termliual to some line, terminatingr in a t-on'taet spring. when thefdesired contact.

is reached. the eireu-t' is broken outside the switch andtlubrushes nuike the desired connection. To restore. the switch tn normal4 when its use. is' o\'er.t. only necessary to {twapply a source of current lo tbe winding of thelmagnet. includingr the contact sprin, n-:.` l-lvand l5 iu the clremt.

',lhe magnet will theninterrupt tsvown circuit. stepping the brushes around until cani closes springs To stop the brush in this position any wellknown device may beemployedto operate upon the closure of the. springs 16 and 17, and break the circuit through the magnet M. lVhat is=claimed is: I

1. The combination in a switch mechanism of a U-shaped `supporting member a series' ofcontacts, a feed plate, a rotatable brush shaft mounted on said supporting member, a plurality of lu'ushescarried hy said shaft arranged to engage and make connection between the. feed plateI and the successive contacts ofv said series, each of `saidubrnshes having a normal position, an electromagnet mounted between the arms of said su pportighieinber, an armature therefor pivo'tally mom'itedbetween the arms of the supporting member, means carried by said armature for operatingfsaid,A brush shaft, a set of spring contacts,"a nd 'means controlled by' thel brush' shaft when'v s`aid` brushes are in 'their normal positions for actuat-ing'sairt contactset. l 2. The-combinaition in 'a switch mecha# nism`- of' a U-shaped supporting" member, a series of contacts, a feed plate, a"i'otatable member, a lplurality of brushes `carried by said shaft: arranged to engage-and' 'make connection between the fectl striand the wntacts of said series, each 'df' said brushes having a normal position, anelect'roniagnet mounted `between -the"arnisf`of saidsupport- .ingmemlu-r, a pivotjpin -tixed tb' the'opposite arms of the supporting'mmle'an armature for ,-aid electromagnetmounted pn said pivot pin,'means carriedby said armature for operating'the, brush sh'aft, a set of spring contacts, a lever" for operating said contact.' ut mounted on said pivot pin, and means for actuatil'l'g,r said sleiter when an one," nf saidbrushes is in itsnrm'al 'position.l

The combination'in-:answiteh mecha, uism ofa.. U-shaped, supportingmember, an arcuate. series-of contacts, an: arcuate feed member, a :rotatable .brush shaft; supported by. thc-opposite arms of the Usl'a'ped member, brushes on4 said shaft'arranird to engage and make connection between the feedj member and the contacts of said series, said brushes -eaeh :having-a norlna-l position,` ani' electronmguet..mounted outhe` U-shapedmenjlher between the armsfthereof, a. pivot'. pin.supportedacross the free ends of said arms, au-arnmture lor .the electromagnetearried b ysaid pivot pin,4 means on said` armature fluoperatiug the brush Shzrftga rontaetl set-'i a 'lever mounted on saidpivotfi` pin 4and arujangcd to aetliate said c o'ilt-actj,

set, and uittins including a cam senrediri ilsaid brushes reaches its normal i susy L The combination in a switch mechanism of a U-shaped supporting member, a series of contacts'7 a feed plate7 a rotatable brush shaft supported by the opposite arms of the U-shaped member, brushes on said shaft. arranged to engage and make connec tion between the feed plate and the contacts of said series, said brushes each having a normal position, an electromagnet mounted on the U-shaped member between the arms thereof, a pivot pin supported across lthe arms of said` U-shaped member, an arma ture for said electromagnet mounted on said pivot pin, means on said armature for operating the brush shaft, sets ot' spring contacts, means on said armature for actuating one of said contact sets at eacli energize.- tion of the electrolnagnet, a bell-crank lever pivoted on said pivot pin and arranged to actuate another of said contact sets,-and means carried by the brush shaft for operating the bell-crank lever when each of said brushes reaches its normal position.

5. The eoi'nbination in a switch mecha; nism of a U-shaped supporting member the. armsof which are )rovided with parallelly extending integral brackets, a series of stationary contacts, a brush shaft rotatably .supported by said brackets, brushes on said shaft arranged to eo crate with said con tact series, each brush aving a normal position, a stepping magnet mounted on the U-shaped member between the arms thereof, anV armature therefor pivoted to the free ends of said arms, means on said annatu're for operatin the brush shaft, a Contact set, a bell-crank lever pivoted between said arms and arranged to actuate said contact set, and a cam attached to the brush shaft for operating said level' "when any one of Said brushes 1s in its normal position.

In Witness whereof I hereunto subscribe my name this 7th day of December A. D., 1916. a

OSCAR F. FoRsBERG.

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