US964711A - Electromagnetically-operated switch. - Google Patents

Description

"J. F. TRITLB. ELEGTROMAGNETIGALLY OPERATED SWITCH. APPLICATION FILED JULY 1, 1908.

- Patented July 19,1910.

Witnesses? Invent or:

JohnFITmLle,

J. F. TRITLE. I ELEGTRUMAGNETICALLY OPERATED SWITCH.

APPLIOATIOHIIIZ D JULY 1,1008.

Patented July 19, 1910; r 2 sngms-snns'r 2.

lllllllllf llll Ill

lllll lnventorz hn Witnessefi f JOHN njrmzrrn, or

To'all whom it may concern. Q

scnnnncran'r, NEW'YORK, comranr, a conronarron or NEW roan.

as srenoa T GENERAL, ELECTRIC ELECTROMAGNETICALLY-OPEBATED sWrrcH.

Application filed July 1, 1908. Serial No. 441,292.

Be it known that I, JOHN F. Tnrrnn, a

citizen of the United States, residing at.

, acters.

partly in section,

Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Electpomagnetic ally-Operated Switches, 0f which the fol;

lowing is a specification; j

My invention relates 'to electro-magnetically operated switches, and articularly to; that class Of'SWIlZChGSlI SBd for controlling power circuits and commonly known under the name of contactors The particular form of switch illustrated and described in this application is adapted particularly for operation by alternatingcurrent but, as will be obvious to those skilled in the art, it might equally well be adapted forms on direct current. I

The general object of my invention is to provide a new and improved form of electromagnetically operated switch which will opcrate satisfactorily on alternating-current.

The particular featuresof novelty will appear from the following description and the appended claims.

, Referring to'the drawings, Figure 1 shows in side elevation a switchbuilt in accordance with my invention; Fig. 2 is a bottom plan View thereof; Fig. 3 is a side elevation, showing particularly the arrangement of the contact members; and Fig. L is a" view in the direction of the arrow at in Fig. 1 showing the 'short-circuiting rings mountedin one of the faces of the laminated field frame.

Like parts are refer-red to throughout the several views by the same reference char- Referring to the drawings, the main frame upon which the parts of the switch are supported is indicated at 5, its form being clear from the drawings. The frame 5. may conveniently between. which are clamped an E-shaped field structure built up of laminated iron and indicated at 6. The laminae of the field structure 6 may be secfircdtogether by rivets 7, some ofwhich, as shown, pass through the two parts of the frame 5 and help secure them and the E-shaped field structure toether. The actuating 'coil of the switch .18 shown at 8 surrounding the middle leg of the E-shaped field structure and supportbe cast in two parts,

ed upon extensions 9 which projectfromlthe frame 10 secured tothe frame 5 by bolts 11.

Pivoted upon a pin 12 .which passes through alinlng holes in the side frame 10 IS an armature built up of members Band 14, between which is interposed the laminated structure 15 of theformshown, the members 13 and 14 and the lqfiilnae being secured together by the rivets-I6.- The ar- .mature is provided. with an extending arm 17 in the end of which on the pin 18 are pivoted movable contact members 19 of the form clearly shown in the drawing, said contactmembers bein provided with. tips 20 which are preferab y removably secured necessary.

in order that they may be renewed when.

The lower ends off the movable contact members 19 are erigagedby one end of the springs. 23, the other ends of which are secured, as shown, to a pin mounted in lugs 24' extending from the armature near the uterend thereof. The springs 23'tend to rotatethe movable contact members 19. in a clockwise direction around the pin 18,

this movement being stopped when the ar i mature is in the position shown in Fig. l by the engagement of a part of each contact member 19 with a portion of the armature,'-

as will be clear from rection away from the E-shaped field frame the drawing. The springs 23 also bias the armature" in'a diand. therefore,- assist the opening movement of the switch. Strips of flexible conductingma-terial 26 may be used,' as shown, between each movable contact 27 on each side of the frame 10 in order'to. provide a good electrical connection be tween said contactmembers and the "frame member 19 and alug instead of relyinglaltogether upon the pivotal connections hers 19 andthe armature and betweenzthe.

armature and the frame.

between [the contact 'mem-,.

An arc cl. ute 30, of any suitableform is secured to the frame 10 by bolts This are chute, which may be of any; suitable insulating and arc-u'esis'ting mater1al, may

31 asshown. I I

ice

conveniently be made in two parts and between them may be mounted tact members '33 provided with removable contact tips 34 which cooperate with the contact tips 20 on the movable contact mem-' bers 19. A blow-out coil :55 may be mounted in the top ofthe arc chute and provided with pole pieces 36 of magnetic material e lower con-f 5 embedded' in the outer sides of in a manner clear from the dr s. One .end of the blow-out coil may secured, to

'scarrexi by arcing,

the'terminal 37, the other end being electrically connected to the flame 10. The fixed contact member 33 may have electricalllg connected to it a terminal 38.

bedded in the end of the outer of the E-shaped laminated'field structure are short-circuited rings 40 of conducting material, such as;.,copper, as best: shown in- Figs. 1 and 4. The, armature is so arranged, with reference to the E-shaped field struc ture, and the length of the legs of this structureis such that, when the armature is in the position illustrated in Fig. 3, it will engage the outer leg but not the middle or the Inner legs. t r

Inor or that after the parts have worn,

especially 'the'pin 12 and the holes in the armature and frame through which it'passes, the armature may by no possibility come into conta'ct withthe middle oi the inside leg of the E-sha'ped structure, pieces 42, L-shaped in cross-section and made ofphosphor bronze,'or other noh -m'agnetic material, may be clamped to the arms 9 and ar-.

ranged to project inwardly between the up per face of the armature and the lower face of the middle leg of the E-shapedstructure. These pieces42 positively insure the armature notcoming into engagement with any of the legs of the E-shaped field structure except the outer one, thereby removing any chance for sticking of the armature due residual magnetismin the field structure.

1, and the coil ,8 is energized with alternating-current, the armature will l e-attracted .into the magnetic field established between the'ends otthe three legs of the E-shaped' field structure and the movable." contact members will be brought into the contact members 19,.will move with it, beingheld with relation tothe armature in the position shown in Fig. 1 byfhe springs 23. T he contacttips 20 and 34 first engage near the outer edges of their coiiperating faces and as the armature moves farther the springs 23 its full extent and the contact tfipsengage through them, always'takes place near the outer edges of the inner portions of the faces will-notbe of phase with that-in j E-shape 4 engagement with the stationary contacts; ,During the first part of;.the movement of the ,armature' v by Letters Patent of the United States, is

are stretched and the contact tips 2O are'caused torock and slide slightly upon v the tips 34 until the armaturehasrisen-to their. cooperating faces and -movable, contact member and a but it will be maintained; smooth and capable of making good elecitrical contact with one so e. the switch is closed, as shown in Fig. 3, the springs Zine/placed under increased tension, and serve to hold the contact tips 20 in engagement with the contact tips 34 under certaln pressure, and at the same time act,

when the actuating coil 8 is den'ergized, to

accelerate the movement-20f the armature away from 'the E-shaped field structure and expedite the opening ofthe contacts, The circuit control ed by the switch asses from the terminal 37' through they bl ziw-out coil 35 to the iron irame of ;the switch, thence through the flexible conductors 261 the movable. contact members 19 and thei'f tips 20 to the tips 34: of the fixed contacts 33, and.

'thence to the terminal 38. The rings 40, embedded in the end of the outer' leg of the Efshaped field structure, serve as the short-,-

circuited secondary of -a transformer, of which the coil'8 is the primary, and the re-. sultant field through these rings will'be out the-E-sliaped frame outside oi, the rings. The magnetic field at the end of the outer leg is in this way maintained sufficient to insure the armature engagin the end of the outer leg of the long as the coil 8' is energized. Since the armature engages only with the end, or the outer leg of the E-sliaped structure-there is structure without chattering as always a gap in. the magnetic circuit through I the armature, and the latter will not'stick been denergizedgdue to residual magnetism in the laminated E-shaped structure.

WhileI have shownv but one. form" in which my invention'inay be embodied, I do not wish to beunderstood aslimiting myselfthereto, except as called for-by {the fol- I lowing claims. It is obvious that; contactors 'in its' lfaised position after the coil 8 hasmay be built in this manner with either more I or less than two pairs of cooperating c on-' tact members, the number of these depending erely upon. the current in 'the circuit .whicliit'is desired to control.

'VVhat I claim as new and desire to secure 1. In an electromagnetically "operated switch, a magnetic field frame, a magnetizging coil arranged in cooperative relation to 'sald frame and serving to produce a mag- ,netic field therethrough, an armature cooperating with said ma net frame and pivoted atone side thereo a movablecontact member pivotally' supportedpn' said arma:

said armature remote from its axis or yieldingly holding said movable contact member point on" in' enga 'ement with saidfiXe d contact memher an for biasing-said armaturein a direction away, from engagement with-said magnet frame when the armature movesinto enga ement with' s'aid frame;

j 2. npan .electro-magnetically operated switch, a supporting shaped magneticmfield structure supported in said frame, a magnetizing coilmounted in said frame and surrounding the middle leg of said E-shaped field structure, a ring 0 c onducting material embedded in the end of one of the legs of said-k E-shaped field; structure, an armature of laminated mate;

rial pivotally mounted in said sup ortin frame and arrangedto mo'y'ejinto an 'outo frame, a laminated E (mu em with that em of said E shaped field structure having the ringfem bedded therein, a fixed contact er, a

movable contact member pivotally 'supgoliff 0 i.

- ing said movable contact member'in yielded by said armature, and a spring ,for 1 ing .engaaament with said fixed contact member w en said armature has moved into engagement with said E-fshaped frame In witness whereof, I- have hereunto set

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