US 2240937 A
Description (OCR text may contain errors)
y 1941- J. 'r. MCNANEY 2,240,937
RECQRDING SYSTEM Filed Oct. 24, 1938 3 Sheets-Sheet 1 ME SH D J. T. McNANEY May 6, 1941.
RECORDING SYSTEM Filed Oct. 24, 1938 3 Sheets-Sheet 2 JOSep/L 7.
May 6., 1941; J. T. M NANEY RECORDING SYSTEM Filed 061?. 24, 1938 3 Sheets-Sheet 5 IIII! IIL TUMXTSUCCESSIVEHETER.
Joseph TMaNa vn ey.
Patented May 6, 1941 "UNITED STATES PATENT OFFICE RECORDING SYSTEM Joseph'Thomas McNaney, Baltimore, Md.
Application October 24, 1938, Serial No. 236,677
10 Claims. (01. 177-380) My invention relates to recording systems and, more particularly, to systems whereby the indications of a plurality of meters may be sequentially recorded at a central station. Although especially applicable to the recording the indications of the meters of a number of ustomers served by a public service company, my invention may be utilized for recording at a central station the indications of a plurality of indicating or integrating meters of any type.
As an example of systems of the general type to which my invention pertains, I call attention to the patentto William H. Pratt, No. 1,902,465.
In the patented system, use is made of existing telephone lines for the purpose of transmitting meter indication signals to a signal station. It has been my experience that the use of telephone lines for other than telephonic purposes is not entirely satisfactory and that telephone companies are averse to such use on the ground that it interferes with proper service to their own subscribers.
It is, accordingly, an object of my invention to provide a meter indication recording system that shall require only a single metallic conductor for conveying meter indication signals from a large number of customers to a central record station.
Another object of my invention is to provide a time-controlled system of the type described that shall sequentially transmit meter indication signals from a plurality of customers to a central record station.
Another object of my invention is to provide a system of the type described that shall be completely automatic in action.
Another object of my invention is to provide, in a system of the type described, apparatus for sending meter indication signals from a plurality of subscribers meters to a central station, which apparatus, after having initially been set into operation through the agency of but one master time-controlledmeans, shall so function as'to positively place the said subscribers meters sed-"uentially in sending condition.
Q In accordance with my invention, I provide time-controlled transmitting apparatus at each subscribers station and synchronously operating recording apparatus at'a central station, the last mentioned apparatus being set into operation in response to an initial signal from a customers station.
Further, I so design and proportion the various elements of each sending station that a complete record of a meter reading, including the number of the meter, may be made at the central station in less than one minute. Such being the case, it is clear that my system is capable of making 1,340 consecutive records in each 24 hours or 43,200 records per month of 30 days.
Preferably, the apparatus at the central station includes means for making a permanent photographic record of the meter readings and meter numbers. Such a record is conveniently made upon a strip of photo-sensitized paper which is caused to automatically and periodically advance to the recording position after the reception of a series of signals from each customers station. The receiving portion of my system is disclosed and claimed in my copending application, Serial Number 236,677.
The novel features that I consider characteristic of my invention are set forth with particularity in the appended claims. The invention in its entirety, however, both as to its organization and its method of operation, together with additional objects and advantages thereof, will best be understood from the following description of certain specific embodimlrts when read in connection with the accompanying drawings, wherein:
Fig. I is a view, partly diagrammatic and partly structural, of the circuits and signal sending apparatus I prefer to utilize at each customer's meter;
Fig. 2 is a schematic front view in elevation 01 a meter dial;
Fig. 3 is a view in vertical elevation, exemplifying the appearance of the front of a meter when the dial thereof is removed;
Fig. 4 is a detail view of a portion of the meter exemplified by Fig. 1;
Fig. 5 is an end view in elevation of the gear train shown in Fig. 1;
Fig. 6 is an end view in elevation of a detail oi the meter, showing the construction of the electrical contact elements;
Fig. 7 isa view, partly diagrammatic and partly schematic, exemplifying the circuits and apparatus I prefer to utilize at a central record station;
Fig. 8 is a top plan view of a meter-record after developing;
Fig. 9 is a diagrammatic view of a portion of the apparatus I prefer to use in an alternative embodiment of my invention;
Fig. 10 is a schematic view 01 a portion of the apparatus utilized in connection with the modiflcation exemplified by Fig. 9;
Fig. 11 is a fragmentary view of a portion of the receiving apparatus shown in Fig. 7;
Fig. 12 is a view exemplifying the circuit connections between the master time switch and the cam-switches when the system exemplified by Fig. 9 is utilized;
Fig. 13 is an exploded view of the meter cups and dial shown in Fig. 1, and
Fig. 14 is a fragmentary perspective view of the peripheries of the meter cups, exemplifying the contact elements and the intervening insu lating material.
In all figures of the drawings, equivalent elements are similarly designated.
Referring now to Figs. 1 and 2 of the drawings, in accordance with my invention I provide a novel meter, the said meter having a single dial I of insulating material, as exemplified by Fig. 2 of the drawings, the units, tens, hundreds, etc. groups of the dial figures being disposed circumferentially at one side of the face of the dial and spaced angularly. Furthermore, the other side of the dial face is also provided with a plurality of angularly separated groups 3 of numbers and a plurality of fixed, grounded contact elements 1 are carried by the dial, one for each group, for the purpose of identifying the meter visually and for sending meter-number signals.
A group of nested cup-shaped metallic elements 9, is mounted rearwardly of the dial, and rotate upon a shaft II, perpendicular to the dial, their rims lying in a plane parallel and closely adjacent to the rear face of the dial. The rim of each cup-shaped element is provided with a plurality of narrow integral axially extending contact protuberances It, as shown in Fig. 3, and the spaces on the rims between the extensions are covered with insulating material Ill flush with the free ends thereof.
Each group 5 of dial figures, representing digits of the totalized meter reading, is accompanied by segmental window I! individual thereto and coextensive therewith.
The windows are disposed at different radial distances from the center of the dial, thus alloeating one window to each cup-shaped element through which window electrical contact may be made with the axially extending contact segments ll carried by the cup-shaped elements. The cup-shaped elements are connected to ground through the shaft II and are so geared to the usual induction disk meter motor (not shown) that the contact segments on the inner element indicate tens, the next ones hundreds, the next ones thousands, and the outer ones tens of thousands.
As will be obvious to those familiar with meter construction, the nested cup-shaped elements 0 take the place of the usual meter pointers and the positions of the electrical contact elements ll, projecting forward therefrom and integral therewith, give an indication of the number of kilowatt hours consumed. The inner elements indicate units, the next ones tens, the next ones hundreds, and the outer ones thousands.-
Fior the purpose of sending an indication of the meter reading to the central record station, I provide a wiper II that, when properly motivated, rotates around an axis concentric with the shaft H around which the dial cups revolve and sequentially engages the fixed and movable contacts. The wiper is provided with a plurality of spring contact fingers I! of the general type disposed radially thereof at different distances corresponding to the radial positions of the windows II in the insulating dial.
The wiper is provided with a brush II electrically connected to a signal line 23 which extends to the central record station. In addition. the wiper-assembly includes a cam disk 25 having a single peripheral notch 21 which so cooperates with a switch as that, when a cam follower II carried by one of the switch blades as shown in Fig. 4, rests in the notch, the switch is open. This is the "rest condition. The axis of the disk is concentric with the axis of the wiper and they rotate in unison when torque is applied.
The function of the wiper and the contact fingers is to sequentially send meter-identifying impulses over the signal line leading to the central record station, the said impulses being spaced apart in time corresponding to the angular separation of the fixed contact elements 1 carried by the meter-dial and, after the meter number impulses have been sent to send a second series of impulses, spaced apart in time, corresponding to the instantaneous angular spacing of the iQtatable contact elements l3.
For the urpose of periodically causing the wiper to make one complete revolution. I provide a constantly rotating synchronous motor ll, preferably of the so called Telechron type, which motor has a shaft I5 concentric with the axis of the wiper shaft H and which is continuously energized from the same source 31 of cycle current that supplies the customer.
The motor It turns at 1 R. P. M. and is provided with a gear II that meshes with the first gear I of a gear train. constituted by four intermeshing gears Ii, 4!, 4!, and 41. The gears and their pinions are so designed that the first gear ll of the train rotates at 1 R. P. M. in unison with the motor, the second gear ll rotates at 1 R. P. H., the third gear 45 rotates once each 24 hours, and the fourth gear 41 rotates once each 30 days. Each gear has a cam or lifter 48 affixed thereto and a biased open switch ll, having a cam-follower II is provided for each lifter.
The lifters on the several gears and the followers actuated thereby are so designed that an angular moven'. ent of less than six degrees of each gear past the contact position of the switch associated therewith permits it to open.
As will be clear from an inspection of Fig. l of the drawings, the blades of the switches are so connected to a pair of conductors II and 61 that a circuit is complete therethrough only when all of the switches are in the closed posishown in Fig. 6, the said contact fingers being 7 tion. The closing of all of the switches and consequent completion of the circuit takes place only once every 30 days. When the switches are all closed, the completed circuit supplies line current to a solenoid I! that, in turn, actuates a clutch assembly \I to effectively connect the motor 33 to the wiper and notched disk assembly, causing the wiper II to rotate from its rest or home position H in the direction of the arrow shown in Fig. 2.
Obviously, the switch ll associated with the first gear ll and actuated by the lifter 48 carried thereby, remains closed but for an instant, and the solenoid energizing circuit would be broken were means not provided for maintaining it closed during one revolution of the wiper which sends the meter reading and meter number signals into the signal line. For that reason, the
notched disk 25 and the switch 19 are provided. the switch being closed by reason of the rotation of the disk immediately upon energizatlon of the solenoid to remain closed until the notch therein has 'made' one revolution to again come to the home position to permit the switch to open. -As stated hereinbefore, the rim of each metercup directed toward the insulating dial is provided with a layer of insulating material except at the points thereon at which the contacts are disposed j- -For that reason, the respective fingers it carried by the wiper ll during its rotation around the dial connect the said cups to the signal line only at the instants when they pass over the saidtcontacts. Having access to but one window ii at a time, the wiper must, of necessity, send the meter number signals and the meter-reading signals in proper sequence.
For example, it may be assumed for purpose of explanation that the service man is supplied with a meter, all of the switches SI of which are in the closed position, which meter is to be installed in a customer's place of business or.home.
It may also be assumed that it is feasible to transmit the meter-reading at 6:55 P. M. on the day of installation without interfering with signals from other meters already in place in other locations.
Under the given circumstances, the service man first physically mounts the meter in position, making sure that itis not connected to the power line but is connected to the customer's power-supply circuit. Thereafter, promptly at 6:55, he connects the meter to the main power supply lines whereby the first, or zero reading I is transmitted to the central station and the minutes switch opens not to close again simultaneously'with the other switches 5| until 6:55 P. M. thirty days after the day of installation. If there is no free-time-period on the day of installation the service man may connect the meter per se to the power lines without connecting the motor 33 thereto. In such event,,the motor 33 is subsequently connected by the service man to the line at a time that will not cause interference with other signals and the first signals sentv from the customer's meter, as described above, will not represent the zero reading but the amount of current consumed by the customer subsequently to the day of installation of the meter.
The angular displacement between the notch in the disk and the wiper must be such that the resilient fingers carried thereby, when current is first connected, are initially disposed upon the face of the. insulating dial in the home position H, shown in Fig. 2. This is the condition immediately preceding the sending of a series of impulses determined asto time by the operation of the gear train.
0n the day allocated to the meter, to the hour and minute, afterthe motor has been energized, the switches 5| will instantaneously-be connected in series and an impulse will be applied to the solenoid 59 causing the clutch to function to applytorque to the wiper and disk assembly. The wiper I! immediately moves away from the home position H in the direction of the arrow shown in Fig. 2 and, in its movement around the dial face, first engages a fixed grounded contact 63 associated with the zero position of the first group of meter number figures to send an indexing signal into the signal line. Thereafter, during the rotation of the wiper, the fingers successively engage the fixed contacts representing the meter numbers and, after impulses representing the number have been sent, engage the movable contacts representing the meter reading. The rotation of the wiper continues until it reaches its home position H and the follower ll afllxed to-the upper blade of the switch 29 drops into the notch 21 provided therefor 'in the disk. 'At that instant the circuit which supplies current to the solenoid is broken and the clutch BI is released. The wiper II, therefore, remains in the home position H until 30 days more have elapsed whereupon the same sequence of operations is repeated.
In order that controversy between the company and the customer shall be obviated, I provide means in the central station for making a permanent photographic record not only of the meter reading but also of the number of the meter. For that purpose, referring to Fig. '7, I prefer to utilize a strip 65 of sensitized photographic paper that is moved into recording position by a motor 61 just previous to the reception of a train of signals and to utilize an intermittently energized lamp 69 for printing a representation of the meter dial upon the paper when in recording position and for causing consecutive marks to be made upon the paper, circumferentially of the dial-picture, corresponding in angular position and displacement to the totalized meter reading and to the meter number.
Referring now to Figs. 7 and 11 of the drawings, the strip 65 of photographic sensitive paper is caused to intermittently advance beneath a generally translucent mask ii on which is imprinted a replica of the dial face at a transmitting station. The lamp is disposed above the mask, and is provided with a depending reflector housing 13 or the like carrying at its lower edge an inwardly directed rim I5. The rim, which is disposed in close proximity and parallel to the mask, projects a distance just short of the indicia on the mask and is provided with a single triangular opening 11 through which light can reach the translucent periphery of the mask and effect the photographic paper thereunder. The lamp 69 is energized from a local source 19 under the control of a normally open switch 8| disposed in the supply circuit.
- In order to simplify the drawings, the paper supply and take-up rolls have not been shown and the light-proof enclosure, for the entire apparatus, obviously required, has been omitted.
. In the home or rest position, the opening 11 in the rim of the lamp housing overlies the zero appearing at the beginning of the first group of meter members, as shown in Fig. 8.
According to my invention, the first signal from a customers meter, corresponding to engagement of the wiper fingers with the first contact on the meter dial immediately adjacent to the home position H of the fingers, is utilized at the record station to cause the lamp 69 to flash and to initiate rotation of the depending housing 13 and circular movement of the inwardly directed rim 15 provided with the triangular opening 11. For the purpose of causing the light to flash initially to indicate the zero or home posisaid circuit is momentarily closed to cause the light to flash.
It is also necessary that the housing be caused to rotate at substantially the same instant the first impulse is received and to continue rotating in synchronism with the wiper at the transmitter until one revolution is completed. To that end, I mount the housing upon a shaft 01 which also carries a cam disk It, (referring to Fig. 11) which has a notch 9| in the periphery thereof and a raised portion 93 immediately adjacent to the notch and apply torque to the shaft from a constantly rotating synchronous motor ll under the control of a movable clutch 91. The synchronous motor ll is supplied with alternating current from the same power line I! to which the motor a at the customer's meter is connected.
The position of the clutch 91 is determined by the energization of either of two solenoids I! and III- operatively associated with a bell crank I" which throws the clutch into and out of engagement. The solenoid 88 is connected through the switch 8|, which controls the lamp circuit, to the local source I! of lamp-potential.
At the instant the first impulse comes from a customer's station, the lamp 6! flashes to imprint the scale on the photographic paper and ill, I01 and I09 is disposed tangentially of the disk carried by the lamp housing shaft, as shown in Fig. 11, the two upper blades ill and I" being included in a circuit that supplies the clutch disengaging solenoid Ill with potential from the same local source that supplies the lamp. Normally, the two upper blades are biased toward the open position. v
The two lower blades III! and III! are included in a circuit that supplies current from the same local source to the paper advancing motor 81.
The said lower blades are biased toward the closed position and the uppermost one, III, of the said two, still referring to Fig. 11, is provided with a cam follower III of insulating material. The cam disk I! rotates in the direction of the arrow shown in Fig. 11, and the relative position of the four bladed switch with respect thereto, is such that when the cam follower rides upon the smooth periphery of the disk, both circuits referred to are open. When the cam follower is in the notch, the two lower contacts close and when the cam follower rises up on the raised portion of the disk adjacent to the notch, the two upper contacts close and the two lower contacts open.
The last mentioned position of the disk corresponds to the home position H (Fig. 2) of the wiper at the customer's meter and is the rest position thereof.
As soon as the first signal comes in from the customers meter, the disk starts rotating in the direction of the arrow (Fig. 11) and the cam follower drops down to the smooth periphery thereof.
As heretofore explained, the clutch remains in engagement and the disk continues rotatina' at 1 R. P. M. until the cam follower drops into the notch. At the instant the follower reaches the bottom of the notch the two lower blades of the switch close to permit power from the alternating current lines 81 to be applied to the paper-advancing motor .1. As soon as the paper has advanced a slight amount, it separates two switch contacts Ill and III which, in the .rest position of the system, engage through one of a plurality of small openings III in the paper shown clearly in Fig. 8. The disengagement of the said contacts breaks a circuit that supplies potential from the local source to the winding of a relay III, which relay, when the winding is energized, holds open a switch III interposed in a shunt circuit that supplies alternating potential to the paper driving motor. The deenergizing of the relay, therefore, completa a "hold in" circuit and causes the paper driving motor to continue rotating until the next succeeding opening in the paper passes between the switch contacts to permit energization of the relay ill and interruption of the motor supply circuit.
The disk continues rotating a slight amount after the sequence of operations just described has been initiated until the cam follower iil rises up on the raised portion .3 thereof to cause the upper contacts of the switch to close and complete a circuit from the local source through the solenoid Ill that actuates the bell crank III, which, in turn, disengages the clutch l1 and deprives the disk-shaft ll of torque. The disk I! then is in the home position and, because of the fact that a fresh unexposed section of the photographic paper has been advanced into recording position, the system is ready for the reception of a train of signals from the next successive customers meter.
It also lies within the spirit and scope of my invention to omit the gear trains from a group of customer's meters and to utilize a single master time-controlled gear train to initiate the sequential operation of all of the meters in the group. The master gear train may be associated with a customer's meter or it may be entirely disassociated from any meter whatsoever and disposed at some pre-determined location in the area being served or at the central oiiice. The following description refers to a system wherein the master gear train is disposed at a customer's meter.
Referring once more to Fig. 1 and to Figs. 9 and 10 of the drawings, the alternative embodiment of my invention comprises one master time-controlled customer's station substantially the'same as thatexemplifled by Figs. 1-5 of the drawings, with the exception that the cam disk associated with the wiper is constructed as exemplified in Fig. 9, having a peripheral notch I" and a peripheral raised portion I21. The switch associated with the cam disk is constructed as shown in Pig. 9, comprising three superimposed blades, I", III and I the lowermost of which has a cam follower I" that engagu the periphery of the disk. The disks 2', shown in Fig. 9, are representative of signal sending apparatus at a plurality of customer's meters. the said apparatus being further exemplified by Fig. 10, wherein elements analogous to those described in connection with Fig. 1 are similarly designated.
Referring again to Fig. l of the drawings, once each month at the master station, under the control of the gear train, the clutch isactuated and an indexing signal followed by a series of meter number and meter reading signals are transmitted over the signal line 23 to the central record station. The disk continues to rotate in the direction of the arrow shown in Fig. 9 until the raised cam portion thereof causes all three of the switch contacts to close momentarily and, thereafter, by reason of the engagement of the cam follower with the notch in the disk, causes both contacts to open and breaks the motor circuit which is maintained closed through the two lower contacts (Fig. 9) while the cam follower rides upon the smooth periphery of the disk. Going back slightly in time, when the follower instantaneously rests upon the raised portion of the disk, the upper and lower contacts of the switch are closed and a circuit is completed therethrough to supply en: ergy to the wiper-driving motor associated with the customers meter from which the next successive reading is desired. It is, of course, to be understood that the successive customer's meters include a wiper and grounded meter dials substantially the same as those described in connection with Fig. l, the only essential difierence in the system residing in the omission of the time control andv clutch actuating mechanism from all of the meters except the master meter.
The energization of the wiper motor 33 at each customers meter is initiated by the next preceding customer's meter, as just explained, and
to the high side of the power line, the intermediate blade of the switch being connected to the other terminal of the motor, a further connection, including a switch, from the intermediate blade to the high side of the power line, the upper blade of the switch being connected to one terminal of a second motor, elsewhere disposed, the other terminal of which is grounded, a cam connected to the first mentioned motor for actuation thereby, the cam being provided with a notch below its periphery and a raised portion adjacent to the notch and the lower blade of the switch being provided with a cam follower, the cam follower normally resting in the notch, whereby when the switch interposed between the intermediate blade and the high side of the power line is closed, the first motor is momentarily energized, the follower rides up on the periphery of the cam to complete a hold in circuit for the meters will sequentially operate to first. send rotates into the home position where the cam follower drops into the notch in the disk to break the local motor circuit.
It is not to be inferred from the following description of several alternative embodiments of my invention that I am limited to a local source of direct current at the record station for supplying signal impulse potential. For example, the local source might supply a carrier frequency, say 1920 cycles, which could be conducted by the existing power lines to the customer's meters. Obviously, in such event, a high pass filter could be inserted in the 60 cycle circuit at each meter for preventing the 1920 cycle current from entering the customers house supply connections and for diverting it exclusively to the signal sending apparatus.
Furthermore, if desirable, a local source of direct signal current such, for example, as a transformer and a copper oxide rectifier may be located at each customer's meter in lieu of a single source disposed at the central record oifice.
It is also to be clearly understood that my in vention is not limited to the specific structuralarrangement of the dial cups, etc. nor to the specific configuration of the insulating dial itself.
Many other modifications of my invention will be apparent to those skilled in the art to which it pertains. My invention, therefore, is not to be restricted except insofar as is necessitated by the prior art and by the spirit of the appended claims.
I claim as my invention:
1. In a system for remotely recording meter readings, a power line, a customer's meter including a normally de-energized synchronous motor one terminal of which is connected to ground and to one side of the power line, a switch having three superimposed blades, the lower blade of the switch being connected directly the said motor and, when the cam follower reaches the raised portion of the cam, the high side of the power line is connected through the winding of the second motor to ground and upon continued rotation of the motor, the cam follower drops into the notch to break the first referred to hold-in motor circuit.
2. In a counting device, a plurality of nested conductive cup shaped elements, the rims thereof lying in substantially the same plane, the rim of each element being provided with a plurality of arcuately spaced apart relatively small axially extending protuberances, and insulating material disposed upon each rim intermediate the protuberances.
3. In a counting device, a plurality of nested cup shaped elements, the rim of each element having a plurality of relatively small axially extending arcuately spaced contact elements, the contact elements being conductively inter-connected, the free ends of the contact elements lying in substantially the same plane, and insulating material disposed upon the rim of each cup shaped element intermediate the contact elements thereon.
4. In a counting device, a plurality of nested cup shaped elements, the rim of each element having a plurality of relatively small arcuately spaced contact elements axially extending therefrom, the free ends of the contact elements lying in substantially the same plane, all of said contact elements being electrically interconnected, insulating material disposed upon the rim of each cup intermediate the contact elements, and a dial supported in a plane parallel and adjacent to the plane of the said free ends, the said dial being provided with a plurality of arcuately spaced segmental windows, one for each cup, through which windows the said contact elements are visible and accessible.
5. In a meter, a fixed indicating dial of insulating material, a plurality of arcuately separated electrical contact elements semicircumferentially disposed on the face of the dial in positions indicative of the meter number, a plurality of nested cup shaped elements mounted rearwardly of the dial to differentially rotate one within the other in accordance with a metered quantity, the axis of rotation thereof being substantially perpendicular to the center of the dial, the rim of each cup-shaped element having a plurality of axially extending arcuately spaced conductive protuberances, the free ends of the protuberances lying in a substantially common plane parallel and closely adjacent to the rear surface of the dial, the spaces on the rims befrom the face to the rear surface thereof, the
windows being substantially opposite to the first mentioned contact elements and being so disposed at difierent radial distances from the center of the dial that only one window is allocated to the rim of each cup shaped element 10' through which window the protuberances carried by the said rim are visible and accessible, and an electrically conductive wiper mounted to move around the center of the dial in a circular path over the face of the dial and to se- 15 quentially engage the first mentioned contact elements and the protuberances accessible through the segmental windows in the dial.
6. The invention set forth in claim 5, characterized in that the arc subtended by any onego of the windows through the dial is less than the arcuate distance between adjacent protuberances on the cup shape element associated with the particular window, whereby one protuberance at a time is accessible to the wiper through they,
7. The invention set forth in claim 5, additionally characterized in that the wiper is provided with a plurality of flexible conductive fingers biased toward the dial-face, the fingers being at 3 diflerent radial distances from the center of rotation of the wiper corresponding, respectively, to the radial location of the contact elements indicative of the meter number and the locations of the windows, the fingers allocated to the win-"35- dows having an engaging portion of a width less than the radial height of the associated window whereby, during rotation of the wiper, the last mentioned fingers may easily enter the windows to make electrical contact with the protuberances' 40 I carried by the rims of the cup-shape elements.
8. In a meter, an electrically conductive wiper mounted rotatably to sweep over a circular path upon theapplication of torque thereto, a plurality of arcuately spaced fixed electrical contacts, representing the meter number, so disposed as to be successively engaged by the wiper during substantially one half of a revolution thereof, a plurality of movable electrical contact elements so mounted as to be successively engaged by the wiper during the remainder of the revolution thereof, the last named contact elements being adapted to represent, by variation in their armate position, a metered quantity, means for applying torque to the wiper and means associated with the wiper for removing the torque upon completion of a single revolution of the wiper.
9. In a system for deriving a plurality of timespaced groups of sequential electrical impulses, the time-spacing of the individual impulses of a given group representing the number of a meter and the momentary totalized reading thereof, a plurality of meters, means associated with each meter for deriving a group of electrical impulses of the type described, the deriving means including a normally de-energized synchronous motor, a power line common to all of said motors, means for connecting one of said motors to the power line to cause the derivation of one group of impulses, means actuated by said motor for disconnecting it from the power line upon completion of the derivation of one group of impulses and means, also actuated by the motor, for subsequently connecting another of said motors of the said system to the power line to cause the derivation of another analogous group of electrical impulses.
10. The invention set forth in claim 9, wherein the means for connecting one of the motors to the power line includes a master time switch.
JOSEPH THOMAS MCNANEY.