US1316942A - decker - Google Patents

Description

F. J. DECKER.

PORTABLE onmome MACHINE.

Patented Sept. 23, 1919.

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F. J. DECKER.

' PORTABLE GRINDING MACHINE.

APPLICATION FlLE D MAR. I3. 1918.

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F. J. DECKER.

PORTABLE cmnoms MACHINE.

' APPLICATION FILED MAR. I3, I918. 1,316,942.. Patented Sept. 23, 1919.

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{a BY; rF/Z f9 66 ATTORNEY 6a as I 7 UNITED STATES PATENT OFFICE.

FREDERICK J. DECKER, OF ROCHESTER, NEW YORK, ASSIGNOR TO SHAFER-DECKER 00., INC, OF ROCHESTER, NEW YORK, A CORPORATION.

PORTABLE GRINDING-MACHINE.

Specification of Letters Patent.

Patented Sept. 23, 1919.

Application filed March 13, 1918. Serial No. 222,097.

To all whom it may concern:

Be it known that I, FREDERICK J. DECKER, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented a new and Improved Portable Grinding-Machine, of

which the following is a specification.

This invention while relating to grinding machines in general has more especial reference to those of the portable type and is particularly adaptable for use in grinding commutators of dynamo-electric machines.

One of the objects of my present invention is to provide a portable'means for truing or resurfacing revolving cylindrical bodies such, for instance, as commutators without having to remove them from the machines of which they form a part as doing so, especially in removing the commutators of large dynamo-electric machines, involves considerable time, labor and expense.

It is necessary that commutators be resur faced from time to time to preserve cylinvdricity because, in action, they are subject to uneven wear from friction of the brushes and the burning action of destructive sparks; and it is a further object of my invention to make use of a grinding wheel as the resurfacing means and to support the wheel in such manner that the operation may be performed while the commutator is revolving at normal or even greaterthan normal speed, thus assuring more perfect cylindricity.

Another object of the invention is to construct the machine with suchfeatures of adju'stment that it can be placed in approximately operative position and then readily adjusted in a manner to bring the axis of rotation of the grinding wheel parallel with that of the commutator and at a proper height relatively thereto.

Another object ofthe invention is to provide a lateral feed for the grinding wheel of such a nature that an extremely fine adjustment can be made and a very fine cut taken off the surface of the commutator.

,These and other objects of the invention pertaining more to details of construction will be more clearly brought out in the following description and particularly defined in the appended claims.

While I have referred to my invention as particularly adaptable for grinding commutators and will throughout the specification speak of it as used for such purpose, it will, of course, be readily understood that a mach1ne constructed in accordance therewith may as effectively be used for grinding other revolving cylindrical bodies so supported that the grinding wheel can engage and traverse their surface.

The accompanying drawings illustrating a machine constructed in accordance with my invention are as follows Figure 1 is a plan view of the machine with parts broken away to more clearly show details of construction.

Fig. 2 is a side elevation of the machine with parts broken away to more clearly show details ofconstruction and with the motor removed.

Fig. 3 is a longitudinal sectional detail taken on the line 3-3 of Fig. 1.

Fig. 4.- is a transverse sectional view of the base taken on the line 4:4: of Fig. 2.

Fig. 5 is a plan view ofthe right hand end portion of the base with respect to Fig. 2.

Fig. 6 is a vertical sectional View taken on the line 66 of Fig. 1;

Fig. 7 is a sectional View taken on the line 7-7 of Fig. 8. a

Fig. 8 is a sectional view taken on the line S8 of Fig. 2. I

Fig. 9 is a vertical sectional detail on the line 9-9 of Fig. 1 showing the manner of adjustably supporting the motor upon the bracket therefor.

Similar reference numerals refer to similar parts throughout the drawings.

The numeral 1 represents the base which is of rectangular conformation and comprisesright and left hand transverse covered portions 2 and 3, respectively, connected by side walls 4. having reinforcing ribs 5 and inwardly extending flanges 6 along their lower edges.

Supported upon the base portion 3 and pivotally connected thereto by a centrally disposed vertically extending bolt 7 is a swivel head 8, such bolt being provided on its upper end with a nut 9 which, when loosened, permits an angular adjustment of the head. This head 8 is formed with a pair of oppositely positioned upright arms 10 having split bearings at their upper ends, provided with clamping bolts 11, and in which bearings are supported the ends of a bolt or shaft 12. Revoluble on the bolt 12 and engaging between the arms 10, 10

to prevent endwise movement is an extension member 13 formed integrally with a [tube supporting head 14 having a boreat "right angles to that ofthe extension memher.

in the manner shown and provided with clamping bolts 16 whereby it is normally held against rotation. It will thus be seen This extension member is slotted at that the tube head 14 may be angularly adjusted about both a vertical and a longitudinal axis. i

Movably supported upon the right hand transverse base portion 2 is a standard 17 having arms 18extending upwardfrom its ends, such arms having slots 19 therethrough each forming an arc ofa circle having a radius extending fromthe axial center of the bolt 12 and these arms are recessed on their outer faces to receive the heads 20 and nuts 21 of tie-bolts 22 engaging through laterally extending bosses 23 formed on the right hand tube supporting head 24. 7

Supported in the heads 14 and 24" and extending slightly beyond the outer ends thereof is a tube'25 which; is held against longitudinal movement 'by rightand left/ hand cap members 26 and 27, respectively, se-

cured to the tube by screws'28 and having their inner ends engaging. the 'outer'ends' of their respective head members. The head 24 is slotted along the top and the head 14 along one side, in'the manner shown, and the tube is normally held against rotation' bythe upper tie-bolt 22 for the head 24 and a clamping 'bo1t 29 for the head 14-which engages through the upper and is threaded in the lower ,one of bosses [3O 7 formed thereon. Thetie-bolts' 22 are keyed to the tube head 24 at. 31 to prevent their rotation. "L'ooseningth'e nuts 21 on the tie-I bolts 22 and-the clamping bolts 16 hereinbefore described permits an angular raising or lowering in a vertical plane of theitube 25 45 which is afi'ected'in the following manner The tube head "24 rests upon the head 32 of a vertically extending bolt 33 threaded in the upper end of a tubular member 34, such member extending through. a projection 35 in the center of the base portionof the standard 17 and being held in its proper position of vertical adjustment by a nut 36 threaded thereon. The bolt 33 is'rais'ed' or. lowered by turning with a' suitable wrench and as it is rals'ed 1t carries 'with'it the head'24 and tube 25 and as it is lowered these members drop by gravity. 7

The tubular member 34 engages through the side walls of the right hand base portion I 2 and is held against endwise movement its head 42 and nut 43. Itwill thus be seen i that b y'turning the screw 39 the trunnion nut may be movedeither to the rightor left as desired and that such nut by its engage- The cap members 26and 27 are formed;

'7 with inwardly extending central portions forming bearings for afeed screw44 wlthin thetube 25 and which is held, against end play by a nut .45 on the left'and the'hub'o'f a hand-wheelj46 keyed to the right hand ends thereof, such nut 45 and hand wheel 46 having suitable washers disposedb'etween them and their respective cap members. if Threaded on the said feed screw 44 isia' nut 47 having a spline 48 engaging in a 3 channel 49 formed in the" top of the tube 25' and extending between the inner ends of the it tube heads 14 and 24. This'spline engages in a recess formed-in anoflset portion 50'o'f i a sleeve '51 slidable on the supporting tube '25 and is secured-to such sleeve by screws52;

while to permit the sleeve to move freely on the supporting tube the sleeve is slotted lon gitudinally alonglone' side, in the manner shown, and provided with lugs 53 for re-' ceiving the clamping bolts 54 'whichare' ad justed to securea proper fitting ofthe' parts.

Formed integrallywith the sleeve 51 is5a motor supporting bracket 55 extendingout- Wardly therefrom,- or toward the observer 'with respect to Fig. l,- and reinforced by webs 56.

adjustment back or forth on the bracket, for

the purpose hereinafterdescribed,by: the

Supported upon-:this'bracket 55is a mo tor 57 the feet 58 of which rest upon the studs 60 provided with clamping nuts 61} and'62' and'sprin'g washers "6-3 engaging be -i;

tween "the nuts'62 and'the under side of the bracket. I grooved to receive longitudinally extending The bottoms of the feet 58are' and parallel guiding bars 64 slidable" with the motor when the same is being adjusted and engagingfin channels 65 therefor in the V raised corners 59 of-the bracket and these raised corners are also slotted at 66 to re bolted a plate '67 comprising a nut into.

screw between the bracket extension 69=and aretaining nut .70 is an operating crank 71 provided with ahandle '72. Turning this 7 1-20 ceive' and permit movement of themotor studs. Toflthe front" of the motor" there is;

crank will eficct an adjustment backor forth as desired of the motor on its support for. the purpose of tightening the belt 7 3-, as will be explained. While the nuts 61 and 62 on the motor studs 60 will be turned sufficiently tight to hold the motor against any accidental movement back or forth due to vibration during the operation of the ma chine, the motor is not clamped to the bracket, due to the action of the spring washers 63, so rigidly but what it can be adju-sted by means of it feed screw 68 with out the necessity of adjusting thenuts on the studs each time such motor adjustment is re -uired. v

lso formed integrally with the sleeve 51 and extending parallel therewith but on the side opposite the motor bracket 55 is a tubular arm 74 connected to the sleeve by a pair of outwardly extending vertical ribs or arms 75 and a centrally disposed longitudinal extending web 76'. The ends of this tube 74 comprise bearings for a spindle tube 77 mounted therein and secured within this spindle tube at its right and left hand ends by screws 78, with reference to Fig. 1, are eccentric 79 and 80, respectively, while threaded within these eccentrics are tapered thrust bushings 81 forming bearings for a spindle shaft 82. The tubular arm 74 is slotted at each end but on reverse sides and for a distance approximately the length of the eccentrics 79 and and is provided above and below such slots with lugs 83 for receiving clamping bolts 84, these bolts being adjusted to permit rotation of the spindle tube 77 but not too freely.

The right hand end of the tube 77 extends slightly beyond its supporting arm 74 and has fixed thereon a worm Wheel 85 'which meshes with a worm 8'6 fixed to a shaft revolu-bly supported in bearings formed on a bracket 87 secured to the right hand connecting arm 75 and having fixed thereto above uch bracket the shank 88 of a suitable operating handle 89. Threaded on the right hand end of the shaft 82 are a pair of thrust bearing adjusting nuts 90 between which and their respective thrust bearin 8-1 are a pair of metal collars 9-1 with a 'ber collar 92 between them; and keyed to the outer end of the shaft is a pulley 93 alined with a pulley 94 fixed to the motor shaft 95. Keyed to the reduced portion of the shaft 82 at its opposite end is a coupling flange 96 between which and the head of its respective thrust bearing 81 is a fiber collar 97 and a steel collar-98, whilefixed to the shaft at the end of this coupling flange is the hub 99 on which is secured the grinding wheel 100. Nuts 101 threaded on the ends of the shaft hold the wheel 100 and pulley 93 in place. The grinding wheel may be of any preferred type according to the work to be done but when the machine is used for grinding commutatorsa wheel especially made for this purpose is used.

As the nut 47 is moved in one direction or the other on the feed screw 44 by turning the hand wheel 46 it carrieswith it the sleeve 51 and parts supported thereby, viz.,the motorbracket 55 and tubular arm 74 with their respective members. In this manner the grinding wheel is caused to traverse the face of the commutator, or other object being ground, and to limit the distance of such,travel, split stop rings 102 encircle the supporting tube 25, one each side ofthe sleeve 51,. and are adapted to be clamped to the tube in any desired position oflongitudinal adjustment by the bolts 103 carried thereby.

'From the description it will be noticed that the wheel shaft 82 is eccentrically suported and that by rotating the eccentrics 9 and 80 through the medium of the tube 82, worm wheel 85, worm 86 and operating handle 89, a lateral movement of the grinding wheel 1 00 in one direction or the other is effected. This lateral feed of the grinding wheel, it will of course be understood, is to bring the wheel into contact with the surface of the object to be ground and the eccentric movement permits of an extremely fine feed adjustment. The shaft. 82 is driven from the motor shaft by means of the belt 73 engaging over their respective pulleys 98 and 94,. and this belt is tightened by the adjustment back or forth of the motor 57, in the manner hereinbefore described, such adjustment being necessitated by the lateral movement of the shaft 82. The grinding wheel travels in the reverse direction to that of the object being ground.

The spline 48 prevents rotation of the sleeve 51 on the supporting tube 25, but should it be desired in the adjustment of the machine to raise or lower the axis of rotation of the grinding wheel relatively to that of the object being ground the same may be accomplished by loosening the clamping bolts of the tube heads 14 and 24 and giving the supporting tube 25 the required amount of rotation which can be done by the operator lifting or lowering, as required, either themotor bracket 55 or the tubular arm 74. When this adjustment has beenmade the aforesaid clamping bolts are again tightened.

When the machine is used for grinding commutators it is set up in the following manner It should first be understood that only enough of the frame work supporting the commutator and the commutator brushes themselves need be removed that will permit the grinding wheelbeing brought into engagement with the periphery of the commutator across its entire surface. The machine is securcd to a heavy plank indicated at 104 in Figsa2I and 4, by means of base clampingplates 105 which .eXtend between the side walls-4 of the' base and engage the flanges 6, each of such plates having a centralve'rtical projection 106 bored out to receive a bolt 107 which nlso extendsjthroughi a hole infthe plank and has a clamping nut, not shown, threaded on its lowerend. The plank 104 is then supported uponbloeks so that the machine will be approximately in the desired position, after which the several adjustments of themachine are'made as follows:' 1 vf 7 First, true horizontal position for the supporting tube 25 is'secured by raising or lowering the same byturning the vertical adjusting bolt 33 in the manner described and 1 after which the-nuts 21 on the bolts 22 of the-supporting head 24 and the: bolts 16' cf-the 'hea'd14 are tightened; and, to'

be able to readily determinewhen' thersup porting tube is level, aspirit level 108 is provided on the sleeve 51' orin any other suitable position. The tubular 1 arm 74, it

'will be "understood, is' always parallelwith the supporting tube 25 so that iwhenone' is in horizontal "position lthe "other 'is :also..

5 Then, if a'lateral'adjustment is'necessary in order to bring the-face'of the grinding wheel malspeed. I have found it'necessary, also, a

when grinding commutators, that the cut,

10.0 1parallel with that of the commutator,

indicated at-109 in Fig.v 1, the screw-39 is operated which effects an angular rotation of the supporting tube 25 and parts carrled thereby on the bolt 7 *as an axis, and-when this adjustment hasz beenmade the nut on the pivot bolt is tightened to prevent further lateral movement. Should it be desiredto adjust the relative position,higher or lower, of the grinding wheel and commutator this may be accomplished by raising or lowering the tubular arm 74 which caused a partial rotation of the supporting tube '25 in the heads 14 and 24, after which the clamping boltsfor such heads are tightened to secure this adjustment. V

be regulated accordingwto. the, current of thejmotor' for: driving the. grinding wheel,

and for this reason an ammeter connected in series with the motor is placed in such position that it can at all times be read by the operator of the machine.

' The machine may be used for grinding,

burnishing or other like; purposes and the kind of wheeloloolthat isused Will be atermined accordingly,'one of speciallcom position for grinding'copper being employed when the machine isused on commutators;

but as the machineisprimarily a grinder I will referto the elementhl00, in: the claims,-

as a=grinding Wheel although not necessa- ,rily limitingtheinvention to thejuse of such.

@It is believed thatfromtheforegoing deg scription'the purpose, construction and mannerof operating the grinding machine are for no further ex sufiiciently clear to call planation herein. What I claim is a a 1. In a machine of'the character described,

a support, a member slidable on said support,bearings anda motor bracket both car,- riedby said slidable member, a' shaft revolubly supported in said bearings, a grinding wheel fixed to said shaft, a motor supported shafthv- Y Y on said,bracket,iand connections between said motor and saidshaftfor driving the 2., In a'machine ofthe character described, 7

a support, a memberslidablelon said; support,-bearings and amotor bracket carried by said slidable member on oppo'site sides of said support, a' shaft revolubly supported in saidbearings,-'a grinding wheel fixed to said shaft, a motor supported on said, bracket,

and connections between said motor; andsaid shaft for drivingthefshaft.

3;. {In a machine of the character described, asupport, a; member slidable on said support, bearings and. a motor bracket carried by said slidable member on-opposite sides 7 of said support, a laterally adjustable shaft 'revolubly supported in said bearings, a grindin wheel fixed to said shaft, a motor adjusta ly' supported on said bracketyand connections between said motor. andfsaid shaft for driving the shaft.

4. Ina machine of thecharacter described, V

a support pivotally mounted to be swung' in both a vertical and a horizontal plane, a

member longitudinally slidable on said support and having-arr angular adjustment in a plane atv right angles to such longitudinal movement,'an adjustably supported motor *and bearings both carried-by said slidable member, a laterally adjustable shaft revo" lubly supported insaid; bearings, agrinding V wheel-fixed to said shaft, and connections between said 'motor' and, said shaft for' driv- :ing th6'Sh2tft;. 5.- In a machine ofthe character described,

a supporting tube, a sleeve slidablelon said tube, a tubular armand-a motorfbracketfcarried'by. the sleeve onop'p'osite sides of said .tubefa jshaft revolu'bly supported in said arms, a grinding wheel fixed to said shaft, 7

a motor supported on the saidbracketjand V tor foridriving the shaft, t 6 In a machine ofthe character described,

connections between said shaft and said mo- I a supporting tube, a sleeve slidable on said tube, a tubular arm and a motor bracket carried by the sleeve on opposite sides of said tube, a shaft revolubly supported in said tube, means for laterally moving said shaft, a grindin wheel fixed to said shaft, a motor adjustzfifly supported on the said bracket, and'connections between said shaft and said motor for driving the shaft.

7. In a machine of the character described, a supporting tube, a sleeve slidable on said tube, a tubular arm and a motor bracket carried by the sleeve on opposite sides of said tube, eccentrics revoluble in said arm, a shaft revolubly supported in said eccentries, means connecting said eccentrics to cause like rotation thereof, means for rotating said eccentrics to effect a lateral movement of the shaft, a grinding Wheel fixed to one end of said shaft, a motor adjustably supported upon said bracket, and connections between the opposite end of said shaft and said motor for driving the shaft.

8. In a machine of the character described, a base, a swivel head supported on the base and having a vertical axis of rotation, arms on said head, a horizontally disposed shaft supported in said arms and means for normally securing the same against rotation, a member rotatably mounted on said shaft, a supporting head formed on said member and having a bore at right angles to said shaft, a tube supported by and rotatable in said head, and means as clamping bolts, for normally holding the said rotatable members in their respective positions of angular adjustment.

9. In a machine of the character described, a base, a tubular member pivotally supported at one end abovesaid base so that its position may be ad usted angularly 1n a vertical plane, base, and a supporting head for the other end of said tubular member slidably sup ported in said standard.

10. In a machine of the character described, a base, a tubular member pivotally supported at one end above sald base so that its position may be adjusted angularly in both a vertical and a horizontal plane, a standard laterally adjustable on said base, and a supporting head for the other end of said tubular member slidably supported in said standard.

11. In a machine of the character described, a base, a tubular member pivotally supported at one end above said base so that its position may be ad usted angularly in both a vertical and a horizontal plane, a standard laterally adjustable on said base, such standard comprising a base portion and a pair of upwardly extending slotted arms, a supporting head for the opposite end of said tubular member engaging between the said arms, and means, as bolts extending a standard supported on said through the supporting head for adjustably securing the same to said arms.

12. In a machine of the character described, a base, a standard supported on the base, a member vertically slidable in said standard, a vertical adjusting screw threaded into said standard and having one end engaging the said member, and means for securing the said member to the standard.

13. In a machine of the character described, a base having a guiding slot therein, a lateral feed screw supported in said base, a standard laterally adjustable on said base, a trunnion nut on said feed screw, a head straddling said feed screw and slotted to receive the trunnions on said nut, and an extension from said head engaging through the said slot and secured to said standard, all for the purpose set forth.

14. In a machine of the character described, a base having a guiding slot therein, a lateral feed screw supported in said base, a standard laterally adjustable on said base, a trunnion nut on said feed screw, a head straddling said feed screw and slotted to receive the trunnions on said nut, a tubular extension on said head engaging through the said slot and secured-to said standard, and a vertical adjusting screw threaded into said tubular extension, all for the purpose set forth.

15. The combination, in a machine of the character described, of a base, a supporting tube having a longitudinally extending slot, members on said base for supporting the said tube, a longitudinal feed screw supported Within saicLtube and means for operating the same, a sleeve slidable on said tube, a tubular arm and a motor bracket formed on said sleeve on opposite sides of the tube, a spline engaging in the said slot and secured to said sleeve, a nut on said feed screw formed integrally with said spline, a shaft revolubly supported in said tubular arm, means for laterally adjusting the shaft, a 110 motor adjustably supported on said bracket, a grinding wheel fixed to one end of said shaft, and connections between the other end of said shaft and said motor for driving the shaft.

16. The combination, in a machine of the character described, of a base, a supporting tube having a longitudinally extending slot, members on said base for supporting the said tube, a longitudinal feed screw sup- 12 ported within said tube and eans for operating the same, a sleeve slidable on said tube, a tubular arm and a motor bracket formed on said sleeve on opposite sides of the tube, a spline engaging in the said slot 125 and secured to said sleeve, a nut on said feed screw formed integrally with said spline, a shaft revolubly supported in said tubular arm, means for laterally adjusting the shaft,

a motor adjustably supported on said 130 bracket,- a grinding wheel fixed to one end of said shaft, connections between the other end of said shaft and said motor for driving the shaft, and stop rings adjustable on said supporting tubefor limiting the movement of said sleeve.

'17. The combination, in a machine of the character described, of a base, a supporting tube having a longitudinally extending slot, members on'saidbase for supporting the said tube, a longitudinal feed screw sup-1 ported Within said tube and means for operating the same, a sleeve-sli'dable on said tube,'a tubular arm' and a motor bracket formed on said sleeve on opposite sides of the tube, a spline engagingin the said slot and secured to said sleeve, a nut on said feed screw formed integrally with said spline, a tube revolubly supported in said tubular arm, eccentrics secured'within said a Second named tube, a shaftrevolubly supported in said eccentrics, a worm wheel on the said secondnamedtube, a worm in mesh with said wheel, bearings on said tubular arm for said worm, means for operating the said worm to effect throughthe rotation of said eccentrics a lateral adjustment of said 7 shaft, a motor adjustab-ly supported on said bracket, a grinding wheel fixed to one end of sa1d shaft, and connections between the other end of said shaft and said motor for said tube, a tubulararm and a motor bracket formed on said sleeve on opposite sides of the tube, a'spline engaging in the said slot and secured to said sleeve, a nut on said feed 7 screw formed integrally with said spline, a shaft revolubly supported in said tubular arm, means for laterally adjusting the shaft, a motor adjustably supported on said bracket, a grinding wheel fixed to one'end of said shaft, and connections between the other end of said shaft and said motor for driving the shaft.

19. The combination, in a machine of the character described, of a base, a supporting tube having a longitudinally extending slot,

such tube being supported above said base in a manner that its position may be adjusted angularly in a horizontal plane and means for effecting said adjustment; members on said base for 'rotatably supporting said tube and means for normally securing 1t against rotation; a longitudinalfeed'screw supported within said tube and means for operating the-same,a sleeve slidable on said tube, a tubular arm and amotor bracket, formed on said sleeve on opposite sides of the tube, a spline engaging in the said slot and secured tosaid' sleeve, a; nut on said feed screw formed integrally with said spline, a shaft revolubly supported in said tubulararm, means for"-laterally adjusting the shaft, a motor adjustably supported on said bracket, a grinding wheel fixed to one end'ofsaid shaft, and connections between the other end of said shaft for driving the shaft e 20. The combination; in a machine of the character described, of a base, a supporting tube having a longitudinally extending slot,

such tube being supported above said base in amanner that its position may be adjusted angularly in both avertical and a horizontal plane and means for .effectlng each of said and said motor 7 adjustments; members on saidbase for rov t-atably'supporting said tube and means for normally securing it against; rotation; a longitudinal feed screw supported within said tube and means for operating the same, a sleeve slidable on said tube, atubular arm and a motor bracket formed on said sleeve on opposite sides of the tube, a spline engaging in the said slot'and securedto said sleeve, a nut on said feed screw formed integrally ,with said spline, a shaft revolubly supported in said tubular arm, means for laterally adjusting the shaft, a motor ad justably supported on said bracket, a grinding wheel fixed to one end of said shaft, and connections between the other end of said shaft and said motor for driving the shaft.

21. The combination, in a machine for grinding commutators, of a base, a supporting tube having alongitudinally extending slot, members on said base'for supporting the said tube, a longitudinal feed screw supportedwithin said'tube and means for op; eratingthe same, a sleeve slidable on said tube, a tubular arm and a motor bracket formed; on said sleeve onopposite sides of the-tube, a spline engagingin the said slot and secured to said sleeve, a nut on said feed screw formed integrally with said spline, a v V shaft revolubly supported in said tubular arm, means for laterally adjusting the shaft, a motor adjustably supported" on said bracket,a grinding wheel fixed to one end of said shaft, and connections between the other end of said shaft and said motor for driving the shaft, the said grinding wheel being adapted to travel in a reverse direction' from that 'of the commutator and to permit the latter to revolve at is normal or greater than normal speed; 22. A grlnding machlne comprising a base, a guide, a connection between the base and the guide permitting the latter to swing about two axes at right angles to each other and to the guide, a carriage movable on the guide, a member mounted to turn on the carriage about an axis parallel with the guide, and a grinder eccentrically carried by said member so that the turning of the member effects the feeding of the grinder.

23. A grinding machine comprising a base, a guide, a carriage movable along the guide, a member mounted to turn on said carriage about the axis parallel with the guide, and a grinder eccentrically carried by said member so that the turning of the member effects the feeding of the grinder.

24. A grinding machine comprising a base, a guide, a connection between the base and the guide permitting the guide to turn about two axes at right angles to each other and to the guide, a carriage movable along the guide, a tubular member rotatable on the carriage about an axis parallel with the guide, a shaft extending through the tubular member and arranged eccentrically with reference to said member, and a grinder carried by said shaft.

25. A grinding machine comprising a base member, a guide, a connection between the guide and the base member permitting the guide to swing about two axes at right angles to each other and to the guide, a carriage adapted to move on the guide, a member mounted to rotate on the carriage about an axis parallel with the guide, a grinder carried by said rotary member mounted to turn about an axis eccentrically to and parallel with said rotary member so that the turning of the rotary member effects the feeding of the grinder, a mechanism for turning said rotary member comprising a worm wheel on the rotary member, and a worm cooperating with said worm wheel and acting to lock the rotary member in its adjusted position.

FREDERICK J. DECKER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C.

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