US1128270A - Dynamo-electric generator. - Google Patents

Description

e. e L. INRIG. DYNAMO ELEGTRIG GENERATOR.

APPLICATION FILED DEC. 12 1912.

1,128,270. Patented Feb. 9, 1915,

2 SHEBTS-SHEET 1.

um-Mm o 4 RQQ/M 5511 @fi THE NORRIS PETERS cO., PHOTG-L|THO.. WASHINGTON. D. C.

G. & L. INRIG.

DYNAMO ELECTRIC GENERATOR. APPLIOATI 0H FILED DEC 1?. 1912 Patented Feb. 9, 1915.

2 SHEETS-SHEET Z I. T OFFICE.

GAVAN INRIG AND LEON INRIG, OF LONDON, ENGLAND, ASSIGNORS T ROBERT L. H'UBLER AND GEORGE S. GREENE, OF DAYTON, OHIO.

DYNAMG-ELECTRIC GENERATOR.

1 128 27@ Specification of Letters Patent. Pgjggntgd Feb, 9 1915 Original application filed July 20, 1912, Serial No. 710,537. Divided and this application filed December 12, 1812. Serial No. 736,292.

To aZZw/wmwtmay 0072067 22.: shaft '7, by means of a key 12, is a non 55 Be it known that we, Gavan Innis and magnetic sleeve 13 which supports an arma- LEON INRIG, subjects of the King of Great ture core 1d. The core 1% is provided with Britain, residing at London, in the county guides 15 which engage the inner side of the of Middlesex, England, have invented cercylinder 9 and thereby support the armatain new and useful Improvements in Dyture which is overhung from the head 8. 6O name-Electric Generators; and we do de- The said armature core l l is secured on the clare the following to be a full, clear, and sleeve 13 by a collar t2 and a head 16, and evact description of the invention, such as is moved along the shaft 7, under the inwill enable others skilled in the art to which flucnce a governor, controlled by the it appertains to make and use the same, speed of the said shaft. lVhen the said core 65 reference being had to the accompanying 1a is moved out of the cylinder 9, as when drawings, and to the letters and figures of the speed of the shaft is increased, the air reference marked thereon, which form a gap between the pole pieces is increased, part of this specification. and consequently the magnetic lines of force Our invention relates to certain new and are decreased and the current generated is 70 useful improvements in dynamo electric mamaintained constant. When the said core chines and is especially adapted to be used 1 1 is moved back into the cylinder 9, as in connection with storage batteries in lowhen the speed of the shaft is decreased, the calities where the driving means is subject air gap accordingly reduced and thus a to rotation in opposite directions, such for constant current is maintained. The in- 75 example, as the axle of a car. crease in the speed of the shaft is counter- The subject-matter of this application is acted by the increase of the air gap or magdivided from our co-pending application, netic resistance, and the decrease in the Serial No. 710,537, filed July 20, 1912. speed is accordingly counteracted by the de- The object of the invention is to provide crease of the air gap. The core 14 may be so a dynamo that is capable of generating a made tapered or conical as at 17 to more current direction irrespective of the direceffectually control the magnetic lines of tion of rotation of the armature. force As has been stated, the core 1% is Referring to the accompanying drawings, moved out of the cylinder 9 by a governor Figure 1 is a longitudinal sectional elevawhen the speed of the shaft increases, and tion through a dynamo constructed accordis moved into the cylinder 9 when the speed ing to my invention; Fig. 2 is a section on decreases. This device is described and the line a-o of Fig. 1; Fig. 3 is an elevaclaimed in our co-oending application Se- 35 tion of the brush rocker; and Fig. 4 is a derial No. 701,608, filed June 4:, 1912. The

tail perspective view of the switch actuator. governor is constructed as follows; Throughout the specification and draw- Attached to the head 16 are pivotal govings, similar reference characters indicate ernor links 18, which are also attached to a corresponding parts. 3 ring or collar 19 slidably mounted on the 40 Referring more particularly to the drawshaft 7. The links 18 are connected with ings, 1 represents the shell of the dynamo, governor balls 20. @n the shaft 7 between 2 the pole pieces and 3 the field coils. EX- the head 16 and the ring 19, is a spring 21, tending from the shell 1 are end casings 4 which exerts a tendency to move the core 14: and 5 which receive bearings 6 for the shaft into the cylinder 9 while the balls 20, under 45 7. Mounted on the shaft 7 is the armature, the action of centrifugal force, exert a the novel features of which form the subject tendency to move the core 14 out of said matter of our ce-pending application, Serial cylinder 9 as will be clearly understood. As No. 701,608, filed June 4:, 1912, and which a consequence, when the speed of the shaft is constructed as follows. On the said shaft 7 increases, the said core will be drawn out 50 7 is a non-magnetic head 8 which supports by the action of the governor, and when the an iron cylinder 9 on which an armature 10 speed decreases, the core will be moved into is mounted. The armature 10 is provided the cylinder 9 by the action of the spring 21. with the usual armature coils 11. In the The ring 19 is, as stated, slidingly mount interior of the cylinder 9 and splined to the ed on the shaft 7, and the movement thereof 4 through the dynamo and the strength of is limited by a shoulder 22 on the shaft 7. The said ring 19 controls a switch 23 connected into the dynamo circuit leading to the storage batteries or accumulators,'and is claimed in the parent case, Serial No. 710,537, filed July 20, 1912. One point of the said switch is mounted on an insulated block 30 attached to the casing 5, and the other point of said switch is mounted on one arm 241 of a lever pivoted at 25 and which is under the control of a spring 26. The other arm 27 of said lever is bifurcated and straddles the shaft 7 and is adapted to be engaged by a loose collar or switch actuator 28 which is, in turn, in engagement with the ring 19. The collar 28 is provided with keys 29, the free ends of which are adapted to be engaged by the sleeve 13 of the core 14:, when the shaft 7 reaches an excessive speed. The weight of the balls 20 the spring 21 bear such relation to each other that, when the normal speed has been attained (at which times the dynamo will give the required voltage), the centrifugal force of the governor balls will compress the spring 21 by drawing the collar 19 along the shaft 7 until said ring reaches the shoulder 22. This movement releases the loose collar 28 and permits the spring 26 to close the switch 23. A further increase of speed draws the core 1 1 out of the armature thereby increasing the air gap, and thus setting up a resistance to the lines of force passing through the said armature. At an excessive speed, the core is drawn out so far that the sleeve 13 engages the ends of the keys 29, thus pushing the collar 28 back against the arm. 24 of the switch lever and thereby opening the switch. hen the speed falls below normal, the current from the battery is prevented from flowing by the open switch; and when the speed is above normal, the open switch prevents the dynamo delivering current of a higher voltage than that required by the battery or accumulator.

The shaft 7 may be provided with any suitable means, such as a pulley 31, through which the machine may be driven from any available source of power, such as the axle of a car. The direction of rotation of a car axle is, of course, subject to the direction of travel of the car, and, as the direction of flow of the current in a dynamo is subject to the direction of rotation of the armature, means are provided for automatically shifting the brushes to maintain the polarity thereof, when the shaft 7 is reversed.

The armature is provided with a commutator 32 engaged by brushes 33, there being four such brushes in this instance, although the dynamo may be constructed with any Copies of this patent may be obtained for five cents each, by addressing the even number of brushes. The said brushes are mounted in arms 34. extending from a rocker 35. The rocker 35 is supported on a hearing or housing 36 by ball bearings 37 which permit the said rocker 35 to freely oscillate. Attached to and insulated from the free ends of the arms 34: is a ring 38 to which four projections or stops 39 are attached. These stops are adapted to engage stationary stops 10 attached to the casing 42 and which forms the cores of electromagnets 11. The friction of the brushes 33 on the commutator 32 is sufficient to rotate the rocker 35, the ring 38 and the stops 39 carried thereby. mutator 32 are rotating in either direction, the brushes will be carried around with said commutator until two of the stops 39 come in contact with the cores 10. The magnets 41 are connected in series with the field coils 3, and consequently, when the stops 39 are in contact with the cores 4.0, and current is flowing through the dynamo and magnets 41, the brushes will be locked in position. The said brushes are then in the position of commutation for that direction of rotation of the shaft 7. When the said shaft 7 is rotated in the opposite direction, the said brushes will be oscillated through an arc of approximately ninety degrees in this in stance, which brings the brushes in the proper position of commutation for the reverse direction of rotation.

Having described our invention, we desire to claim,

1. In a dynamo, a shiftable rocker, brushes supported by said rocker, said rocker, being adapted to be shifted in either direction by the friction between the commutator and the brushes to maintain a constant polarity of the dynamo, and electromagnetic stops adapted to limit the movement of said rocker.

2. In a dynamo, a shiftable rocker having arms extending therefrom, brushes supported on said arms, said rocker being adapted to be shifted in either direction by the friction between the commutator and the brushes to maintain a constant polarity of the dynamo, a ring supported on the ends of said arms, projections on said ring, and electro-magnetic stops adapted to be en gaged by said projections to limit the movement of said rocker.

In testimony whereof we affix our signa' tures, in presence of two witnesses.

GAVAN INRIG. LEON INRIG.

Witnesses CHARLES BEALE, HENRY HUNT.

Washington, D. 0.

Commissioner of latents.

When the shaft 7 and como

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