US983158A

US983158A - Dynamo-mounting.

Info

Publication number: US983158A
Application number: US41700308A
Authority: US
Inventors: James F Mcelroy
Original assignee: Us Light & Heating Co
Current assignee: United States Light & Heating Co; Us Light & Heating Co
Priority date: 1908-02-21
Filing date: 1908-02-21
Publication date: 1911-01-31
Anticipated expiration: 1928-01-31

Description

J. I'. MOBLROY.

DYNAMO MOUNTING.

APPLIATION FILED FEB. 21, 190B.

83, l 58 Patented Jan.31, 1911.

3 SHEETS-SHEBT 1.

983,158., Patented Jan. 31, 1911.

J. F. MUELROY.

v DYNAMO MOUNTING.

APPLIOATION FILED 1113.21, 190s.

3 SHEETS-SHEET 2.

yllnle EEE J. F. MOBLROY.

DYNAMO MOUNTING.

APPLIoATIoN FILED 1113.21, 1908.

3 SHEETS-SHEET 3.

Patented Jam.v 31, 1911.

same time the tendency of the dynamo to its vFig. 3 a side view thereof.; lFig. i shows the detail.

axle of the ear-wheel, journaled in the ordi'u JAMES fr?, .lQoELRUi-", ALBANY, NEW YQRH, ASSXGNGR, Bf MESNE SSGNELENTS,

THE UNTED LEGHE" fr HEATHG CPAEY, @F NEVI YGRK, 'N'. Y.,

vSpecification of Letters Patent.'

DYNAMO-EKOUNTNG.

Patented Jan, 335i, ddii.

.application niet?. February 2l, 190%. Serial Ho. 417,003.

To all whom it 'may concern.

Be it known that l, dairies l?, MCELROY, a citizen of the United States, residing in the city oi Albany, countylo Albany, State or'l New York, have invented certain new and useful improvements in Dynamo-Mounting, ot' which the following specification and accompanying drawings represent that form which l now regard as the best of the various forms in which the terms and substance of the invention may be embodied.

ln the drawings, Figure l is a plan view of my invention; Fig. 2 an end View theroit';

My invention relates to the mounting of dynamos upon railway vehicles, and particularly to such mounting of the dynamo that it may bedriven from one oi'- the caraxles by means of a belt.

ln particular, l so mount the dynamo that it may be adjusted bodily to and from the car-axle, and, moreover, provide for it a self-adjusting tension device, by means of which the tension on the belt is maintained substantially uniform in spite ot variations 1n the length of the belt by stretching or other causes. l also mount the dynamo upon a pivotal support, the axis of rotation of the dynamo being Within the body ofthe dynamo itselr", whereby the aforesaid tension device may take up slack in the belt and at the swing upon its supports under sudden shocks is practically eliminated. l also split the dynamo casing at the top and bottom and hinge one haltl thereof so that it may open outwardly on the side et the machine from the car-axle. ln this same hallB ot the dynamo casing l also provide a door hinging on nearly a vertical line, so that it may be opened outwardly and nearly 'in a horizontal direction, to permit ready access to the interior oii the casing.

The foregoing features, together with others to be herematter described, will form the subject-matter of the claims hereinafter stated.

Turning to the drawings, i represents the nary manner in a truck, the transverse beams or which are indicated at B and C, and the longitudinal beams of which intheatedl at D, D, D2, D3 (see Fig. l). Upon the end beam B and projecting rearwardly therefrom are two bracket arms E and E. At their inner extremities these brackets are bolted to the under side of the beam C (see Fig. 3). From this point they pass upward toward the rear and rest upon the top side of the beam B, to which they are secured by clamps c and e. The rear or outer ends 0i' these brackets are provided with brace bars F and F', which extend. from the extremities of the brackets in an outward direction, as appears in F ig. 1, and at the same time in a downward direction, as appears in Fig. 2, to the beam B, to which they/are bolted.

Between the two bracket arms E and E the dynamo G is supported at a point outside of the truck beam B in the following manner. 'lo the under side of the dynamo, and parallel to the dynamo shaft, is bolted a bar H, the ends of'which are bent up'ward (see Fig. 2) to a point slightly above the axis ot the dynamo. A similar bar E; is bolted on the inside of the dynamo adja# cent to the beam B, the ends of this barbeing turned inwardly, as appears in Fig. and bolted to the bar H. The two extremi ties or" the bar H are bolted to sliding loo-ps K and l, which embrace and slide upon the respective bracket bars E and E. llhese loops are adjusted in position 'along the bracket bars, and are secured thereto at a desired point by means of bolts 7e and fr', which pass through the two sides of the loop and through ay hole in the bracket bar einbraced by the loop.` By this means the dynemo, which is pivotally suspended from these loops, is given an approximate adjustment with respect to the car-axle. 'lhe connection between the aforesaid loops and the respective extremities orP the hanger bar H is secured by means of the bolts L and L',

the axis ot these bolts being the airis 'of the bodily rotation of the dynamo. lt should be observed at this point that this axis of rotation is within the body oi" the dynamo and is as close to the center or gravity thereoiE as is consistent with the tensioning of the belt by the means to be hereinafter described. The purpose of this is to reduce the tendency of the machine to swing to and iro under the impulse given by the sudden starting oit the cars in one direction or the other and the bumping against/ other cars', and similar causes. Of course, if the dynamo were suspended exactly at the center of gravity, such shocks would have no effect toward causing the dynamo to rotate on its supports-in other. words, its suspension would be neutral with'respect to shocks of that kind. It is my object to approximate as closely as possible to this neutral support by vmounting the pivots upon which'the dynamo hangs as nearly to the center as may be permissible under the circumstances.

The dynamo being Vpivotally mounted, as above described, a belt S is provided, which connects the drive pulley S on the car-axle A with the smaller pulley S2 on the shaft of the dynamo. @n the sliding loop K nearest to the belt S and at the'end of the loop farthest from the car l place a downward projection K2 (see Fig. 3). To the lower extremityv of the projection K2 l pivot one end of the spring guide W, the other end of which is attached to abraclret "V bolted to the bar H', which in turn is bolted to the casing of the dynamo.. rlhe spring guide W is made with two telescoping portions with a spring between 'them whichobviously tends to draw the dynamo in a direction away from the truck and toward the aforesaid projection K2. The tension of! the spring, therefore, tends to rotate the dynamo bodily around a center coincident with 'the axis of the supporting bolts L and to thereby put the belt S under tension.

Referring particularly to Fig. 3, it will be` manifest on inspection that as the belt becomes slack the tension of the spring will tend Vto diminish, but at the same time the horizontal` axis of the spring will drop as the dynamo rotates around the bolt L.

'l`herefore,` although the tension of the spring would be somewhat decreased, yet it will act on a longer lever arm with respect to the bolt L as a fulcrum. Conversely, if the belt is tighter and short-er the horizontal axis of the spring will rise nearer to the bolt L and thereby, although its tension is in'- creased, it will act upon a shorter lever arm with respect to the axis of the bolt of the fulcrum. By this arrangement the'spring will always exert substantially the same tension upon the belt regardless of the length of the belt and the distance between the eenJ ters of the two pulleys.

It will be manifest that the result of my construction as thus Afar described is to relieve the belt from all unequal strains. For example, the above described hanging of the dynamo upon the axis of the rotation lying within the body of the dynamo relieves the belt from the sudden and excessive strains which would result if the dynamo were pivoted at a point either above 0r below it. In such case a shock tending to swing the dynamo away from the truck esente would produce a sudden and abnormal strain on the belt, 1whereas. a s hocl.: tending to swing the dynamo toward the truck would first slacken up the belt but the rebound to the action of the spring would produce a heavy blow on the belt, tending to snap it in two. Moreover, by means of the selfadjusting tension device above described, 'the belt is kept equally taut, in spite of any stretching, so that it need not be given an undue degree of tension when it is first ap plied, inorder to prevent it from .slipping after it has become slightly stretched. l am also enabled by the adjusting of the aforesaid sliding loops along the bracket arms to k insure that the shaft of the dynamo will be parallel with the car-axle at all times, there being the same number of adjusting holes in each of the brackets, these holes being located in respectivevbraclets at equal distances from the canelle. By this means l avoid the necessity of tightening the belt by minute gradations in the bodily position of the dynamo itself with respect to the caraXle. l give the sliding loops a lined and definitev advance along the brackets, either toward or from the car truck, by delinile and comparatively long steps and then secure theml positively in position, the tension being then taken care of in the way l have described by means of the self-adjusting spring. This not only enables the beltto ru'n true by maintaining the dynamo shaft parallel to the car-axle, but also avoids the necessity for cutting oif a section of the belt and relacing it to shorten itafter it becomes stretched `to a considerable degree. Ylt is only necessary in my construction to set the sliding loops baclr to the next hole and secure them in place, the tension device aforesaid talring care of the smaller degrees of adjustment. The tension of the belt is also not dependent on screwing the dynamo bodily back and forth as in some adjusting arrangements.

Qver each one ofthe sliding loops l and K l provide a guard loop X X (see particularly Fig. et), the two ends of which are bolted to the inturned-end portion of the bar H. By this means the loss of one or both of the main hanger-bolts L and L will not cause the dynamo to drop out ou the track and derail the train. At the same time the braces F und ll" will prevent 'the sliding loops escaping from the ends of the bracket bars E and fdl. These guard loops may be said to span the main hanger bolts in that they forni a supplementary connection around those bolts between the dynamo on the one hand andthe bracket bars on the other.

The casing of the dynamo is split into two parts on an approximately vertical line, the two parts being hinged together near the bottom atY the point Z (see lfig. 3) und llO las

brought together at the top, being held together by the bolts e, Figs. l and .9..r By thls meansl the rear half of the dynamo casing may be swung outwardly and the armature removed by slacking up the belt and lifting it from the pulley S2. Moreover, in the. said removable half of the armature casing is a door P lying in a slightly' inclined plane and hinged so as to open outwardly to permit of the easy inspection of the interior of the dynamo. A similar door J hinged at the top of the machine on 'a horizontal axis, is provided at the lett of the door B and serves to give access to the mechanism which reverses the dynamo connections on the reversal of the direction of rot-ation.

My invention is primarily desi ed for anelectric-lighting dynamo driven y a caraxle, but may also be employed in the event of the dynamo serving as a motor to drive the axle While my mode of tensioning the belt may be employed in any situation wherein a dynamo whether acting as a generator or as a motor is belted to an axle, which term is in this respect inclusive of a. shaft of any appropriate kind.

Whatl claim as new and desire to secure by Letters Patent is:

1. The combination with an axle, of a dynamo belted thereto, means for adjusting the dynamo to and from the. axle by definite ste s and supplementary means for automatica ly maintaining air substantially constant spring tension von the' belt.

2. The combination with an axle, of a dynamo belted thereto, a, supporting bracket, means for adjusting the dynamo at denite points along the bracket, a rotatable mounting for the dynamo, and means for adjusting the tension of the belt by movement of the dynamo around its axis of rotation.

3. The combination with an axle, of a dynamo belted thereto, a support for the dynamo movable to and from the axle by equal definite steps at both ends, means for mounting the dynamo rotatably in said support, and a spring tendina to rotate the dynamo upon its support or maintaining `the tension of the belt.

4. The combination with an axle of a dynamo belted thereto, a support for the dynamo adjustable to and from the axle, means for securing the said support at definite oints, and a spring tending to rotate the ynamo withlrespect to the said support tor imposing'tension onthe belt.

5. rEhe combination with an axle, of a dynamo belted thereto, an adjustable support for the dynamo upon which the dynamo is rotatably mounted, and a self-adjusting sprin for imposing a substantially constant tension on the belt.

6. rlhe combination with an axle, of a .dynamo belted thereto, an adjustable support for the dynamo upon which' it is roat the other end. tothe dynamo in a linceccentric to the axis of rotation of the dynamo. L

7. The combination with an axle, of a l dynamo belted thereto, a support for the dynamo upon which it is rotatably mounted, and a spring tending to rotate the dynamo on its support and act-ing alonga line eccentricwith respect to the axis of the rotation of the dynamo but changeable in position with respect to such axis, whereby the leverage of the spring varies substantially inversely as its tension.

8. The combination with an axle, of a dynamo belted thereto, a support for the dynamo upon which it is rotatably mounted, a spring tending to rotate the dynamo around its axis of rotation in a direction away from the axle, and a pivotal mounting for the spring whereby the line of action of the spring varies as the dynamo is rotated on its axis to increase its leverage as the dynamo recedes from the axle.

' 9. rI`he combination with an axle, of a dynamo belted thereto, a support for the dynamo upon which it is rotatably mounted, a spring tending to rotate the dynamo on its axis, and connections for the spring permitting it to act upon thedynamo on a changing leveragel increasing as the belt slackens as the dynamo is drawn farther from the axle.

. 10. The combination with an axle, of a dynamo` belted thereto, a support for the dynamo upon which it is rotatably mounted, the axis of rotation of the dynamo on its support being vwithin the body of the dynamo and approximately atv its center of gravity, and means for imposing tension on the belt by pressure tending to rotate the dynamo upon its support. y 11. The combination with an axle, of a dynamo belted thereto and located at one side of the axle, an adjustable support upon. -which 'the dynamo swings upon' an axis lying Within the body ot the dynamo approxi-A mating in positiontofthe center of gravity thereof, and means for tensioning the belt by pressure tending to swing the dynamo upon its supporting' axis.

l2. The combination with an axle, .of a dynamo belted thereto, a support for the dynamo at one side of the axle upon which the dynamo swings and which is adjustable by definite steps to and from the axle, and a tension spring anchored at one end to the said support and connected to the dynamo at the other end and tending to tension the belt by pressure acting eccentrica-ily to and at varying distances from the axis of suspension of the dynamo.

13. The combination with an axle, of a dynamo belted thereto, horizontal supportingvln'acketsfor tlie dynamo. supports adjustable along said brackets and upon which the dynamo is rotatably mounted, and a seifadjusting spring connected at one end to one of lie said supports and at tlie other end to the dynamo and acting to tension the belt by rotating the dynamo upon its supporting' axis.

14e. Trie combination with a car axle, oi a dynamo mechanically connected thereto at one' side of the axle and having its casing split at top and bottom, so as to open outwardly on that side vof the dynamo away from said axle.

15. The combination with a. car truck of overhanging brackets projecting outside tne truck axle and a dynamo mounted 'on said brackets and having its casing split at top and bottom in a line tlirouglihe journal axis so as to open outwardly on the side away :trom tlie truck.

1G., The combination with a car axle5 of dynamo having a driving connection there with, a support on Wliicli'tlie dynamo is rotatably mounted and a guard spanning the point by which the dynamo is uphelt l?. in combination7 a car truck, a, genera tor, connecting means for securing said gen# eratoi' to said truck, and supplementary' means associated with said elements, noi;- inaily inoperative but adapted to cooperate with said truck upon failure of said connecting means.

18. The combination Wit-li a car truck., of a generator mounted thereon, driving means for said generator associated with said elements7 and means for maintaining substantially uniform tension of said drivingmeans upon changes in the relative proportions thereof.

in vWitness whereof i have hereunto set my hand, before two subscribing witnesses. this 18th day of e`t 1inaiy7 1908.

JAMES F. MCELRY Vfitnesses 2 BEULAH @Amon ERNEST D. JANSEN.