Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS796034 A
Publication typeGrant
Publication dateAug 1, 1905
Filing dateJul 3, 1901
Priority dateJul 3, 1901
Publication numberUS 796034 A, US 796034A, US-A-796034, US796034 A, US796034A
InventorsThomas Duncan
Original AssigneeThomas Duncan
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric meter.
US 796034 A
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

No; 796,034. rATENTEp AUG. 1, 1905.

* ,T; DUNCAN.

ELECTRIC METER.

APPLICATION FILED JULY 3,1901.

DOLLAR s. -CENTS.

lit- V211 1:15

THUMAEI LII] EATI- UNI ED STATES PATENT OFFICE;

Specification of Letters Patent.

Patented Au 1, 1905.

Application filed July 3, 1901., Serial No. 66,951.

To all whom it may concern:

Be it known that I, THOMAS DUNCAN, a citizen of the United States, residing'at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Imrovement in Electric Meters, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to meters, and has for its object the provision of an improved form of meter whereby the consumer can ascertain without calculation and without special knowledge of the instrument the cost of his service.

In practicing my present invention I preferably employ a commutated motor-meter having current and pressure windings in combination with means for changing-the eflective number of turns of one of the windings, whereby the torque is adjusted to produce a speed of the meter in proportion to the cost of the current. I prefer to change the effective number of turns of the series winding, for which purpose a switching device having step-by-step contacts corresponding to different costs of current is employed, the various contacts constituting terminals of different parts ofthe winding, so that more or less of the current-winding is included in circuit, according to the position of the switch arm.

I will explain my invention more fully by reference to the accompanying drawing, which illustrates a meter constructed in accordance with my invention.

I have shown an alternating-current generator a, supplying current to transmissionmains b b, that convey current to translating devices a c, which may be incandescent lamps, motors, or other instrumentalities. I do not wish, however, to be limited to an alternati'ng-current system of distribution, as my invention is equally applicable to other sys-, tems of distribution. In the specific application of the invention illustrated the measmutator f, which engages brushes 9 g, that are connected with the mains b b and which include the armature in bridge of the transmission-mains, a resistance It being included andthe armature e produce fields that are in proportion to the current and pressure, a torque resulting that causes a rotation of the shaft i in proportion to the watts. A starting-coil k is provided for overcoming friction, &c., while the shaft 11 is provided with a damping-disk Z, that cooperates with the dampingmagnets m to retard the rotation of the shaft.

As indicated in the drawing, the. meter is adjusted for the highest price of current, (in this instance twenty cents,) the entire field- Winding being included in the main circuit, whereby the greatest torque is secured and the shaft of the meter caused to rotate at the highest rate of speed. As the cost is reduced less of the current-winding should beincluded' in circuit to reduce the torque. Thus if the cost is eighteen cents the switch it is move from the button 20 cents to the button 18 cents, a section of the series winding being thus cut out of circuit.

I have not illustrated any of the counting mechanism in this application, the shaft of the meter being, as is understood, coupled with the counting-train to operate the index of units of cents upon the extreme right, the index of tens of cents next to the extreme right, the index of units of dollars to the left of the tens of cents, the index of tens of dollars to the left of units of dollars, and the index of hundreds of dollars to the left of tens of dollars.

While I have herein shown and particularly described the preferred embodiment of rent, step-by-step adjusting means for governing the effective quantity of field-winding of themeter to produce a torque in propor-' tion to the cost set for the current to produce a change in rotation of the rotating element of the meter in proportion to the current cost and thereby efiect a corresponding operation of the measuring mechanism, and a torque coil or winding is subject to the pressure, substantially as described.

2. The combinationwith a system of electrical distribution, of a meter having fieldwindings receiving current from the said system, measuring mechanism provided with means for determining the monetary equivalent of the consumed current, step-by-step adjusting means for adjusting the effective quantity of a field-winding to adjust the torque of the meter to produce a rotation of the rotating element of the meter and an op eration of the measuring mechanism in proportion to the cost of a given quantity of current that may be set, and a torque coil or winding 7c subject to the pressure, substantially as described. Y

3. The combination with a system of electrical distribution, of a meter having field- Windings receiving current from the said system, measuring mechanism provided with means for determining the monetary equivalent of the consumed current, a step-by-step device to adjust the effective amount of one of the said windings, thereby to govern the torque and adjust the speed of the meter in accordance with the cost set for a given amount of current, and a torque coil or winding is subject to the pressure, substantially as described.

4. The combination with a system of electrical distribution, of a meter having fieldwindings receiving current from the said system, measuring mechanism provided with means for determining the monetary equivalent of the consumed current, a step-by-step device to adjust the effective amount of the current-windings, thereby to govern the torque and adjust the speed of the meter in accordance with the cost set for a given amount of current, and a torque coil or wind ing 7c subject to the pressure, substantially as described.

5. The combination with a system of electrical distribution, of a meter having fieldwindings receiving current from the said system, measuring mechanism provided with means for determining the monetary equivalent of the consumed current, a step -by step device to adjust the effective amount of one of the said windings, thereby to govern the torque and adjust the speed of the meter in accordance with the cost set for a given amount of current, a commutator for the armature of the said meter, and a torque coil or winding 76 subject to the pressure, substantially as described.

6. The combination with a system of electrical distribution, of a meter having fieldindings receiving current from the said system, measuring mechanism provided with means for determining the monetary equivalent of the consumed current, a step-bystep device to adjust the effective amount of the currentwindings, thereby to govern the torque and adjust the speed of the meter in accordance with the cost set for a given amount of current, a commutator for the armature of the said meter, and a torque coil or winding 7r subject to the pressure, substantially as described.

7. The combination with a system of electrical distribution, of a meter supplied with current therefrom, measuring mechanism for determining the quantity of the consumed current, step-by-step adjusting means for governing the eflective quantity of" fieldwinding of the meter to produce a torque in proportion to the cost set for the current to produce a change in rotation of the rotating element of the meter in proportion to the cost, and thereby efl'ect a corresponding operation of the measuring mechanism, and a torque coil or winding 7c subject to the pressure, substantially as described.

8. The combination with a system of electrical distribution, of a meter having fieldwindings receiving current from the said system, measuring mechanism provided with means for determining the quantity of the consumed current, step-by-step adjusting means for adjusting the ell'ective quantity of field-winding to adjust the torque of the meter to produce a rotation of the rotating element of the meter and an operation of the measuring mechanism in proportion to the cost of a given quantity of current that may be set, and a torque coil or winding 71: subject to the pressure, substantially as described.

9. The combination with a system oi electrical distribution, of a meter having lieldwindings receiving current from the said system, measuring mechanism for determining the equivalent of the consumed current, a step-by-step device to adjust the efl'ective amount of one of said windings, thereby to govern the torque and adjust the speed of the meter in accordance with the cost set for a given amount of current, and a torque coil or winding 7c subject to the pressure, substantially as described.

10. The combination with a system of electrical distribution, of a meter having fieldwindings receiving current from the said system, measuring mechanism provided with means for determining the quantity of the consumed current, a stepby-step device to adjust the efl'ective amount of the current windings, thereby to govern the torque and adjust the speed of the meter in accordance with the cost set for a given amount of current, and a torque coil or winding Z: subject to the pressure, substantially as described.

11. The combination witha system of electrical distribution, of a meter having fieldwindings receiving current from the said system, measuring mechanism provided with means for determining. the quantity of the consumed current, a step-by-step device to adjust the efiective amount of one of the said windings, thereby to govern the torque and adjust the speed of the meter in accordance with the cost set for a given amount of current, a commutator for the armature of said meter, and a torque coil or winding 76 subject to the pressure, substantially as described.

12. The combination witha system of electrical distribution, of a meter having fieldwindings receiving current from the-said system, measuring mechanism provided with means for determining the amount of the consumed current, a step-by-step device to adjust the effective amount of the currentwindings, thereby to govern the torque and adjust the speed of the meter in accordance with the cost set for a given amount of current, a commutator for the armature of said' meter, and a torque coil or winding 7c subject to the pressure, substantially as described.

13. The combinationwith a-system of electrical distribution, of a meter having fieldwindings receiving current from the said system and setting up corresponding magnetic fields, measuring mechanism provided with means for determining the quantity of the consumed current, a step-by-step device to adjust the strength of one of said magnetic fields, thereby to govern the torque and adjust the speed of the meter in accordance with the cost set for a given amount of current, and a torque coil or winding 7c subject to the pressure, substantially as described.

14. The combination with a source of electrical energy, of mains supplied thereby and conveying current to translating-mains, a wattmeter having current and pressure windings supplied with current by the system step-by-step adjusting mechanism for determining the effective quantity of the current-windings, and a torque coil or winding 70 subject to the pressure, substantially as described.

15. The combination with a generator of electrical energy, of mains for supplying the said energy to translating-mains, a wattmeter having current and pressure windings, the current-windings being included in series in the working circuit, said windings being subdivided into coils, terminal contacts for the coils and the switching-arm connected in the working circuit adapted to engage one 'or the other of the'said terminals to govern the amount of effective windings in the circuit, and a torque coil or winding is subject to the pressure, substantially as described.

In witness whereof I hereunto subscribe my name this 23d day of May, A. D. 1901.

THOMAS DUN CAN.

Witnesses:

GEORGE L. ORAGG, HERBERT F. OBERGFELL.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4106095 *May 31, 1977Aug 8, 1978Electronic Data Systems, Inc.Electrical usage display system
Classifications
Cooperative ClassificationG01R11/56