USRE11588E - Electric meter - Google Patents

Description

I 2` Sheets-Sheet 2.

J. HARRIS. BLEGTRIG METER.

No. 11,588. Reissued Feb. 2, 1897.

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ATTORNEY 'and the paper UNITED. STATES i PATENT A OFFICE.

v.l ESSE HARRIS, OF LYNN, MASSACHUSETTS ELECTRIC METER.

SPECIFICATION forming part of Reissued Letters Patent No. 11,588, dated February 2, 1897. Original No. 5113,865, dated August 6,1895. Application for :tinus 61nd' October 13, 1895. Serial No. 566,160.

in the county of Essex, in the State of Massachusetts, have invented new and useful Improvements in Electric Meters, of whichl the follo\ ving,taken in connection with the accompanying drawings, is a full, clear, and exact description. i f

My invention relates ,to meters, and partieularly to that class designed'for measuring and automatically recording the strength or force of the current'in any electrical circuit and the length of the time during which the current is flowing, and conversely the timeduring which the current flows or lect rica-ily is used.

My object is to produce a meter which will register power used and as it is used, comprising a paper strip fed regularly by clockwork, a pencil mounted upon a slide, a rackbar connectedto the slide, a gear engaging with' said rack-bar to reciprocate, a motor driving said gear when the circuit is closed, according to t-he strength ci?V the current, said current passing through the current-coil. produeinga torque upon the pressure-coil, which throws it to the right, and through the connection toa reversing-switch causes the motor to turn in such direction as to wind upa coil or spiral spring until the torque of the spring balances the torque of .the current and pressure-coil, when it stops; but this has operated also to' throw the pencil outward upon the moving paper, and as the paper is fed continuously the pencil will mark a straight line so long as this balance continues, and as the current-diminishes in force and consequently reduces the torque upon the pressure-coil, which is overcome by the spring and thrown to the left, causing the motor to be run backward until `the spring is proportionately nncoiled and the pencil drawn back, will mark the paper accordingly and according tothe iiuctuatonsof the strength of the current, being graduated as a chart the pencil-line will thus, by its variations, indicate and record the number of watts passing through the meter; and in meters which are in circuit for long periods oftime, or where a chart is not desired, a dial device is substituted, which gives the addition of the watthours passing the-'meterin a given time bev4tweenreadings. It is constructedas follows, l reference being had to the accompanying drawings, in whichv i Figure 1 is alplan perspective of the meter` with the outer case or cover removed. Fig. 2 is a vertical sectional eleva-tion on a line through the field-coil and by theside of the pressure-coil. Fig. 3 isafront elevation of the reversing-switch. a chart as marked by the pencil for recording watts. Fig. 5 is aplan of the circuits. Fig. U is a plan of the coil-spring,` Fig. 7 is a front elevation of a Watt-hour indicator'or recorder- Fig. S is a side elevation of the same. Fig. l) is a pian of the pieces ot' leather upon the roller which is driven by clockwork in the watt-hour mechanism.

A is the base 0r back uponwhich the brack- `ets a are4 mounted and which carry the field 'or current coil B, which is of ordinary construction. back, and in it a stud isscrewed, in the bots torn of which is a bearing in which the shaft c is stepped, and D is the pressure-coil mounted upon 'said shaft. VA reversing or circuitchanging switch E is mounted upon said back and provided with the posts d, to which the `wires d', leading to the motor-armature, are connected and to which the springs e are connected, said springs being connected by an 'insulated cross-bare', to which the arm h uponthe pressure-coil is connected. 1t is further provided with the contact-posts lo and k, to which` the wires m m' and 'n are Fig. 4 is a plan of part of' An arm b is also secured to said connected. The wires fm. m' are connected struction connected to the switchboard in any ordinary manner, and 1J is the pressure! wire terminal, while fr 'r' are the terminals for the current-wires.

When a circuit is. closed, thetorque produced on the pressure-coil operates the switch` vAt the same time the inthe usual manner.v -motor rotates the shaft S and the gear s', which engages with-'and aotuates the geert,

H is a. motor of ordinary con` which is loose upon -tliestud, but which is connected to the spring u, as by means of a stud 'u.,', the inner end ot said spring-being connected to shall f'. Thus the rotation ol' the motor produces a'torsion upon the spring at one end, while the torque of the pressure- 'coll produces a wind-up strain upon the other cud and when thus auton'latcall' )reduced "fh' 'orqic 'of tlic 'spring' baii''es ,t ife tord u'c" of the lcoil. The maximum strength ol the current is recorded by the apparatus for that purpose, actuated by the motor-shaft. A gear t is secured to the gear t and is shown as point will indicate it bythe apex of its mark- 3o the dials 18 through thc gearing, subst'an-f` hub, andthel rack-bar is engaged by the gear f' andl is connected to a slide 3, which is mounted and adapted to be reciprocated in or upon ways .t and carrying the arm 5, in Vwhichl the pencil is held, having its point in contact with the paper strip t', whichds being wound over the roll'l'froln the roll S, the roll T being rotated by the clockwork D. 'hen the circuit is closed andthe motel' actuates the gear i, asaforesaid, the'rackLbar is'thrown over to the right and the pencil-point carried with it -and marks the paper, making a line-@which shows precisely and accurately the 'number of watts passing through the meter, according to the transverse graduation upon the paper and thc tinieby the lateral graduation. Then the torque of the coil is balanced, the penciling, and so long as such balance is maintained the pencil will make its mark in adirect line longitudinally to the apcr, and ever varia-A 4tiofrn thcsltr'engtl' the''mq e in' dlcat'ed by the marking, and whenthe circuit isA broken the pencil will mark a straight line to the lefthand margin of the paper.

Where meters are in use foi` long periods or a chart .is not desired, a dial mechanism of ordinary construction is substituted, consist-` ing, briel y considered, of the following parts: A roller 10, having apartiul cover of leather 11, is driven continuously by a clockwork, and a rod 12 is mounted in the frame, upon which is a hollow or tubular' spindle 13, loosely mounted and adapted to be reciprocated and provided with a loose wheel 14, the outer end of said spindle being connected to the rackha-r, and by said rack-bar movements, through the rotation of the .gear t, said roller is advanced and brought into contact -wit-h the leather on said roller and rotated and by itsv rotation rotates the roller 15, the shaft 16,. and the pointer 17, and also'intermittently aetuates the other pointerssuccessively upon vtially as shown. g

In Fig.` 5 I Ashow a plan of the circuits, 19

beingthe generator, 20 the motor-circllit, 21

the current-coil circuit, 22 .the pressure-coil 6o circuit, 23 the lamps, and 24 the motors, all

of which are known to electricians.

The purpose'of thc reversing-switch is to control the motion and direction of the motor, in order to obtain all continuous balance between the torsion-coil andthe pressu re-coilthat is to say, when the current isturned on,

or the then iiowin g current be increased, then y thc torque ol' lhc pressure lcoll would overcome the spring, the pressure-coil would turn upon the shaft lo the right, throw the cou- 'tncts on the switch, Fig. Il, to the right, and `cause the motor to rotate to wind up thel p 'sl'iig ln'nlil its t'or'que balaiiccd-the torque on the pressure-coil, whereupon the contacts would break awa y from the posts 7: on the right, and the motor would stop. Then ii the current bc decreased or cut olf the strain torque ou the prcssurcfcoih which wouldV move on its shaft and throw the contacts on the switch to the left into conta-ct with the posts 7c 7.", when the motor would revolve in the opposite direction and unwind the spring unt-il the balance was again' obtained and the ineter-cirenithopened. K

Having described my invention,jwlmt l claim, and desire to secure by Letters Patent,

. torqucof said coil.

3. A pressure-coil mounted upon a shaft, n Srl-ilincolinetcduto.slid ,Siisttclisl 139521119,- tor,aiid'anirlucombination.

l. A pressure-coil mounted upon a shaft,

a spring connected to said shaft and to a mol,

tor, a current-coil and a motor, and means to record the current passing through the current and pressure coils.

5. In a registering device a reciprocating 1. 'l`hccombination with n pressurc-coilaml ioo arm having a loose pulley or rollerconnected therewith and lying between revoluble rollers, one of said rollers being arranged to be continuously revolved and having a portion of its face raisedand arranged so that when ythe reciprocating varm is moved longitudinally the'loose roller 'on said arm will be brought into and thrown out of contact with said raised surface on the continuously-revolving roller and arranged Aso that when the loose roller on the arm is revolved by said raised surface, its mot-ion will be communicatedto the other rollcrand toa train of gears and to a y'plurality of indicating-pointers substantially as described.-

li.. A pressure-coil tion and a resilient device connectedwith the pressure-coil and with .av motor, a currentcoil and a motor, and means to record the current passing through the current and pressure coils substantially' as described.

IIO

yarranged to,have rota# In testimony' whereof l affix my signature j

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