US981236A - Electric meter. - Google Patents

Description

H.`N. ALwoon. ELECTRIC METER. y APPLIATIOH FILED AUG. 20. 1908.

Patented Jau 10,l 1911.

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.ELECTC NET5?.

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H. N. ATWOOD.

.ELECTRIC METER.

APPLIOTIOE FILED AUG, 20. 1508.

Patented Jan. 10, 1911.

- a SHBETS-SHEBT a.

Inventor'. Harr-y N. Atwood,

W'thesses: 9% w narran Smyrne Parana* orifice.

HARRY N. AIWOOD, OF LYNN. MASSACHUSETTS, .ASSIGNOR TO GENERL vELEGTR-IC COMPANY, A CORPORATION OF NEVJ YORK.

ETECTRC METER.

sisi ezio.

Specification of Letters Relient.- Patented Jan.- 10, 1911.

Application filed August 20. 190B'. Serial No. 449.413.

To` all 'whom it ifi-.fly concern.'

Be it linown that' I. llARiiir .\Tw oon.

a citizen of the l'nited States. residing! at Lynn', eorinty of Essex. State of Massachusetta. have invente certain new and uscfui f Improvements in lllectric Meters, of which the `following is :i specification.

Bly invention relatesto meters, and more particolari) to .so-called mercury meters where an armature revolves in a receptacle containing:r mercury, and has for its object certain. improvements in the construction of such meters which will make them cheaper E to construct and more reliable.

I accomplish the object of my invention .by the use of a disk armature revolving iii i a flatreceptacle containingT mercury and lieing Subject to the intiuenee of two-magnets dianiet'ricaliy opposed with respect to the armature in orner to balance each other's effect upon the armature, and thus, as far as possible, eliminate friction; and also by the uscl of an indicating pointer which turns l through nearl;v 360, and thus gives che 1nstrumenta greater range and allows the position 0f the pointer to be read with greater ease than may tie done in the usual forms of indicatingr meters.

more clearly the construction of the meter: Fig. 2 is a side view iartially in section; and

Fig. 3 is a top view of the meter with the top portion removed. for aclearer understz'inding;r of my invention.

I have shown a back 1, to which is at tachefl a cover 2 b any suitable means, the frontl of the cover icing eomposel ot a .sheet of glass. or some transparent, material 3. Attached to the back of the meter I have i shown a mcniber, which supports the workz ing parts of the meter and attached to the lower portion of the member 4 I have shown a member 5. which is substantially disk-like` in shape. Beneath the member 5, and attached thereto, I have shown member G of substantially the saine shape as member 5, but not in close contact with member 5, except at' the edges; so that there is left bei tween thesitwo members a space 7, which i may be filled with mercury or any maniciconducting' liquid. and in which space sui'- rounded by the liquid fillingi the .space re-v volves armature Spivhieh made `in the i `shape of a disk. and ot' any suitable conductz iu r material. The armature connected to :i shaft 9, which bears at its lower extremity against a bearing 1() let into member t' in i any well known manner, and at. its upper i extremity bears against bearing 11` which Vis supported by arm 12 ot' member 4.

I have shown two C-sliapeil magnets 12, which are made up of punehingsl of magnetic material; the magnets being supported hy arms 14 of member 4 in such a way that 2 thcy'are diainetrieally opposed with retorence to thc armature of the meter. (hie pole of these magnets. 15,' extend; through the i top of cover 5 of the meter. so as to he in close relation to the armature, -ind the other pole 15I fits cloScly against'. nir-inher (l, which l I prefer to make of sonic magnetic material, l such as castiron, while member 5 may be made of some nonanagnctic material,A such as aluminum. Surrounding magnets 13, I have shown coils 1G, which are potential coils.,

the circuit which I desire to measure, coils 16 being so wound that poles 15 of each magg not. will be of opposite polarity. 17 are. Londuetors which are brought into contact with the mercury of the meter on diainetrical line. on which the magnets 1S are placed, and which are in close relationship with the armature S. and extend through suitable` bushings 1T to insulate them from members 5 and 6. Coi'iductors 1T are connected by conductors 18 ti. studs 19, which extend through a suitable'l insulating: member 2O through the back of the meter. and may he used tor fastening the meter to any suitable. support; and are also used for conveying,r the current from the circuit to be measured. Attached to the. armature shaft is a small weight 21, which partially counler-balanees the buoyant eltect of the mercury upon the armature. and may be. slipped down. so as to close aperture made. in the top ot' cover 5, through which aperture the shatt passes, and thus preventsA any leakage or' mercury when the motor is heineT shipped. Attached to the .shaft is also a weight 23, which fur- 5 ther serves to balance the armature. t 24 is a gear-wheel, which is connected to l .l and are connected across the conductors` oi'A Further improvements are pointed out;

2 1 Y rsi.;

which Imiiilul' QT. i

in lining my nich-r. l' uumlr-ct. one cfm- (lmgiox' of flic circuit, irhivh l desire to measi Lw, su ihm the curi-vm rciil luw thriiiij will he simpl): pmporlirinal (n ihr: current ilwuiiig iii ilw cirrfiiil.

Whilv l have lL-scribvd n Ciirlniirform it'. which my iri\' -iit; ii muy be Carrlcd Oul, l in im: limit in vsuli fo ilus form, but Scrl;

in 'hf' nmwiirlml claims i0 cowl :Ill furnis' :nzfi :m :z'ligwr iii-m rriziiniirl lim upper Pd mi zi hxift rniafzihlv in (he merr' puriionnl io the prmhu-,l m the, cnrrmii'. and the voiizig. ".Yhii'i the. connections :ire nimh* f l have lscribecl, :mil the currfm. is llmrf ing in the. circuit, lh'v. uriimiurcwill tend to revolve in a. cert-iin rirvrlimi: und will bv oppasml by the zirtimi of he Spring, .iill'il a condition of equilibrium is ohininwi whe-ri: hc torque of the nilri'vr armature is equal i0 the restraining loriinfof the spring, at

wicl'i point ihn arnmiiire xviii remain in a wiislzizl posiiion :and the sunouril. of energy' consumed muy he read by he l silikon of needle 27 in from'. of dini It will be obvious to the.

skilieil in the :ii-t haiff While l have desrrilwd :i meierf where the torquen the armature is pro- (hired hf; the interaction of the currentf iiowing ilu-nigh the :mimi-ure and n mag-Q miic lield which varies with Vthe poteniiril :and is zmsed by puiential windings upon g :m iron core in the Well understood maxim-r, 'tizii I muy rvphic the poenlinl nizigiirs by gwrmnivnt inagiiifi. am! Shim nhi'iiii: nu

s ""U .Ahavlr a hnfiingf into thi nwri-iiry inir :rmireying riirrmir in the :u'umlurin im magiwiS energized by windings whim@ currf-:t varies with ne pociilinl of the circuit lo he mcnturerl, in uperative relation in the armuliirv. und disposed mi opposite sidos 'if die simil. :i back fr lha nwlir, :i iiwmlsP- :illzirhwl therein Supporting the Urhhif pars )1` the melfir, imi-ing iwo arm1 [or supporing the magnets :md :i third ,firm :n'rr ing an upper bearing for the shaft, :i p-'xiner gfared lo "hifsimil for indicating the @Kruit o? its movement, a spiral spring .fateiief io the shaft for restraining its movement., and :1

Weighi mi the shaft c0unir-halancing the HARRY N. ATVOD,

Witneses: i mmv-.vn IJ: R03 ELIAS, Joux A. MCMAXFS.

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