US1303011A - Commtjtatob-slotting machine - Google Patents

Description

latented May 6, 1919.A

2 SHEETS-SHEET l.

F.. E. AURAND.

coMMuTAToR sLoTTlNG MACHINE.

APPLICATION FILED IULY l0. 1918.

F. E. AURAND.

COMMUTATOR SLOT'TING MACHINE.

APPLlcATloN HLED JULY 1o. 19m.

1,303,011. Patented Mayn, 19ML 2 SHEETS-SHEET 2.

omzaw? n UNITED STATES PATENT OFFICE.

FRANK E. AUBAND, OF OAK PARK, ILLINOIS, ASSIGNOR OF ONE-HALF GUY W.A LUNN, CF RIVERSIDE, ILLINOIS'.

ooMMUTAToR-SLOTTTNG MACHINE.

Application flied Juiy io, 191s y To all whom t may concern:

of Illinois, have invented a certain new and useful Improvement in VCommutatorl of mica.

Slotting Machines, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forminga part of this specication. f

My invention relates to commutator slotting machines'.

The insulating material vbetween the copper bars of commutators generally consists When the commutator is assembledthe mica is put under pressure and forms a dense Vhard mass which resists wear to a greater degree than does the metal of the commutator bars. It is customary to undercut the mica slightly where the commut'ator is lrst put out..

Unless this is done the rubbing of tlief brushes will wear the copper below -the level of the mica and then chattering and eXcessivewear' of the brushes, and bad running. results because-of the mica. project?V ing above the copper of the commutators.

My invention aims to provide a suitabley slotting machine for cutting away to the desired ,degree the insulation between bars. The present invention-is an improvement upon the device of my prior Patent Number 1,260,125 granted March 19th 1918.

V'Vhile the prior device has proven to be 'highly satisfactory in service, I have found that as to certain details'of construction 'the present device is markedly. superior. It is one of the ob'ects of the present invention to provide an improved guide.

In the prior device the guide, which runs l in .the slot'between commutator bars and which holds the slotting saw in line with the mica which normally fills the slot, is pivoted ongthe head member to the rear of the saw. As a consequence, raising -or lowering of the handle beyond a certain critical position tended to'causeonly the toe or the heel of the guide toV operate in guiding the saw. I have provided inthe present-device, i.a guide which is pivoted concentrically with the saw so that the edge of the. guide always stands tangent to the saw andl therefore changing of lthe position of the'handle does not alter the effectiveness of the guide.v

Speci ication of Letters Patent Patented May 6,1919;

Sex-inl No. 244,228

a detachable wearing shoe which may be' replaced for slots of different widths: The

guideI has been Afurther improved by the employment of a c'oiled spring` working in a socket in the head for holding the guide in the slot.

A further object of my invention. is the provision' o'f an improved live spindle for tlie saw and improved means for lubricating the bearings of the live spindle and means for ,lubricating the worni shafts.

vA. further object isthe provision ofan adjustable depth controlling shoe for vary- -in'g the depth of the cut of the saw.v

Another improvement.v resides in the com# Abined ,casing and handle and the provision -of a switch in position where it can conveniently be controlled by the opeiator.

Further improvements will bevapparent A,from tliefollowing detailed description and the accompanying drawings which form a part of vthe pi'esent specification.

In the accompanying figures:

Figure l .is a right hand side elevation of the slotting machine of my invention,

Fig. 2 is a longitudinal axial section of the same; i

Fig. 3 is a left side view of the head of the machine on `a slightly enlarged scale; i F ig. 4 is a right hand side view ofthe head with lthe cutting saw removed;`

Fig. 5 is a bottom plan view of the head showing the shield for the worm and worml and depth shoe, and

Fig. 11 is a front elevational view of the vslotting machine of my invention showing the same arranged for use on a coiiimutator.

As shown in'the'accompanying drawy ings, the device of myA inventionpcomprises a slotting saw 1, which is in the forni of a vmounted on the outer end of the driving shaft 6, this shaft being `contained Within the longitudinal handle andframe membeiA l`1 'Y The shaft 6 isv drivenby a small electric motor 8 of any convenient electrical characteristics. .r The motor and the shaft are' connected by a suitable coupling 9-12 The combined handle and frame member 7 connects the head l3 Withl the motor! 8, `the rear part of said handle frame member'be` ing-enlarged as shown at`11to form a bell or housing closely embracing the forward end of the motor 8. This housing or bell portion- 11 is secured to the motor frame by suitable studs which thread into the end of i the motor frame. These studs pass througlrv ears or lugs extendingin'wardly from the opening 15. The clamping nuts 14 thread over the studs and hold the bell firmly in place on the en d of the motor frame so that the edge of thebell engages the shoulder 16. The bell 11 is provided with ornamental openings The driving shaft is coupled to the motor shaft 10 by a pair of toothed coupling members 9l and 12.which are readily separable. The end of the shaft 6 projects into the portion 9 of the coupling, thus holding the two shafts together in aX-ial alinement The'driving connection is secured by the offset tongues and notches in the coupling members 9 and 12 -respectively. 5

Y A collar 80 is pinned to the shaft' 6 Vand 40, the roller thrust bearing 18 lies between the collar and the shoulder 81 in the extension 31of the -head 3. The thrust of the Worm is in an outward direction; an anti-friction bearing on the other side of the collar is not necessary.

The worm 5 vis threaded or otherwise' mounted upon the outer reduced end of the shaft 6 and is held in p lace by means of the screw 21. The shaft 6 has a bearing 19 at the front end in thehead3 as indivcated at 19. The rear end of the shaft is supported from the bearing 22 Vof the motor frame. Axial motion of the shaft 6 is prevented in the forward direc-tion by the thrust bearing 18 and in the other directionby the collar 89 which engages the end of the' frame and handle member 7.

A'rear handle and frame member 24 is providedwith a bell member 25 which is secured upon the rear .end yof the motor frame by means of the counter-sunk headed screws 26 which fasten tothe motor frame. The cable which carries theconductors for the `motor enters the rear lend of the handle i member 24 through an insulated bushing 28 gether.

and passes through the switch 29 to the `motor 8. This switch 29 is of the push pin variety having a pin 30 which is shoved from one side to the other to open and close theycircuit. This pin is surrounded by a linger depression 85.

' The head member 3 is p rovided with a tubular extension 31 which isv internally threaded to receive the threaded extension 32 of the elongated lframe member 7 The 75 two partsare pinned together by means of the screw 33. f

The head member 3 is provided with transverse bearings for the saw spindle 2, these bearings being formed in the projecting members 34 and 35 ,(see Figs. 5 and) which have a slot between them for receiving the Worm wheel 4. The slot in the front of the head member 3 which forms the extensions 34 and 35 is just wide enough to receive the worm gear 4 and to hold the same in alinement with the worm. The live spindle 2 has a hollow bore 37, which is adapted to be filled with grease. Openings 38 and-39 from the bore 37 to the outside of the spindle, provide means vfor lubricating the bearings in the extensions 35 and 34 respectively.v

The live spindle is provided with a transverse pin 40 which serves -as a key to connect the worm wheel 4 with the spindle 2. The Worm Wheel 4 is provided with slots or keyways 41 on each side of the central bore to receive the ends of the pin 40 for keying the worm Wheel and the spindle to- A shoulder 42 is formed by turning down the idle end of the spindle 2 and this shoulder abuts against the side face of the worm' wheel 4` to posi-tion these parts' deinitely with respect to each other. The pin 40 is of a length .no greater than the larger portion of the spindle 2 so that the spindle may be introduced into .the bearings axially from the left as shown in Fig. 6. The idle end of the spindle 2 is provided with a collar or washer 43 which is pinned to the spindle and is held in place by means of the screw 44 which threads into the open end of the bore 37. A

The end of the spindle which carries the 115 saw 1I is provided with a collar 45 ywhich' seats in a. corresponding annular recess in the bearing of theextension 35 and which thereby tendsv to prevent axial displacement of the spindle 2 to the right as shown in 120 Fig. 6. The end of the spindle 2` is proyided with a collar v46 shown more clearly '1n Fig. 4, this collar being of an outer diameter substantially equal to the central opening in the saw 1 so that the saw may 125 as a key for preventing slippage of the saw with respect to the spindle.

' The adjacent portion of the head is pro- I vided with a cylindrical bearing surface/49 -upon'i'vhich 1s mounted the guide member 50. The guide 50 comprises a Hat plate adapted to fit on the cylindrical bearing 'and to lie betweenthe saw 1 and the right hand-side surface of the head member 3. This guidemember is providedzwitha rearwardly extending guide shoe supporting 'portion 51, shown more clearly in Fig. 3.

permits the'guide. to take hold as soon as the cutter or saw enters the slot.

The main body of the, guide member 5() has a shoulder 54 which engages the -pin 55.

The pin55 is attached to theplunger 56 whichplunge'r is controlled by a spring 57. The spring 57 lies in .a` suitable socket in the head member 3 Iand tends to force the plunger 56 with its attachedl pinl 55, down- -ward and this pressure is transmitted to the.

guide member -50. Thus fo'rd varying positions of the handle the guide shoe 53 will tend to be held in the slot of`the'comm'uta-- tor. A .small anti-friction roller 58 on the pin 55 provides for easier operation of these parts. The motion of the guide member' 50. is limited by'a pin 59 which lies in a Slot or notch 60 formed on the adjacent edge of the guide member 50.v The outward motion of the spring plunger 56 is limited by the rear end of the depth controlling shoe 61 which shoe lies over the recess in which the spring and the plunger are located.

It will be apparent from thel above de-J* scription that 4the mounting of the guide `member .50 concentrically with theaxis of the saw 1 insures a constant and unvarying relative 'position betweenthe saw and the Y guiding shoe 53, The lower edge of the guiding shoe 53' is'placed substantially tangent with the edge of the saw-and consequently any variation in the radial position ofthe guide member 50 will have no effect upon the relative posit-ion of these two`parts.

The depth controlling shoe 61 comprises a separable member attached to the bottom of the head member 3 closely adjacentl the saw 1 and the guide member 50. The bottom of the shoe 6.1 is suitably curved immediately below the ysaw 1 soy that the same may ride 4easily along thevcommutatorbars regardless' Ysmaller end of the frame 7 vand of the position of the handle. The rear end of the shoe 61 has an extension 62 which is' clamped to the bottom of the headv 3 by means of the screw 64. A fulcrum pin 65, which projects into a shallow recess in the bottom of thehead member 3 serves to control the setting of this adjustable shoe to give -thedesired depth of cut. To adjust the depth controlling shoe the clamping screw 64 is loosened and the vfulcrum pin 65 4is then adjusted and the clamping screw 64 again tightened up.

The depth controling shoe 61 is seated and held laterally in the slot which is formed between'the lower portion 66 of the cylin-y drical bearing 49 and a projecting shoulder 67- formed 'on the bottom portion of the r extension 35.

The left hand side of the head member 3 is providedwith asquare groove to 'guide the vertical portion 68' of the bracket 68 which bracket supports the guiding roller 69. The guiding roller is adapted .toengagethe surface of the commutator for holding the saw 1 in`radial positionwith respect to the commutator so that the slots between bars may `be accurately cleaned without damage to the and gear from injury and prevents 1any'f i thing accidentally `getting into the same."V

I have provided means for lubricating the bearing 19 in the grease cup 77 which lies between the extensions 34 and 35 back of the worm wheel 4 :nd which 'has a wick which extends up info contact with the bearing portion of the shaft 6. An oil hole is tapped diagonally from the top'of the headl 3 for y the thrust bearing18. .This oil hole is 'normally closedby the screw 78. r

I have provided a felt. washer or barrier 79 within vthe frame 7 to prevent, as far as possible, .any dust or dirt getting intothe entering the bearings 18 and 19. l j

Ido not intend to belimited to the` precise details of construction shown and described, -as it is apparent that modifications within the scope of the appended claims are possible without departing from the spirit of the inventionl i The operation of the device described is asfollows: Slotting of the commutator 80, shown in Fig. 11 is necessitated by the wearing down of the copper bars 81 faster than Vthe mica or other suitable insulating mathe brushes. The push button switch 29 in therear handle 24 is operated to supply current to the motor 8. The motor 8 drives 'the shaft 6 andthis shaft, through the worm 5 and the worm wheel 4, turns the spindle in a counter clockwise direction .as indica-ted in Figi 1. The saw 1 is then pressed against the edge of the mica and guided by hand for a very short distance until the guiding shoe 53 takes hold and thereafter the entire device is automatically guided to cause thesaw to run in the slot. n

As clearly shown in Flg. 11, the aXis of the roller 69 lies'substantially parallel with a tangent to the circumference of the comi mutator 80, consequently the roller 69 itself stands substantially radially with' respect to the commutator, 'and the roller can be ad-` justed as to relative height, s0 that when the sawcuts down into the mical the required depth, the roller Vwill Contact with the com-l mutator, and 4at thev same time the depth guide 6'1 will also rest -upon the periphery of the commutator and .these two will effec- Qtually guide the slotting machine onv the l stea-dying the device against lateral tilting commutator rand control the depth of the cut off the saw. This isl an important point, i

as it relieves the operator of the strain of or other condition of imbalance and results in more accurate and even trim-ming of the mlca.

vThe roller 69 carries considerable of the weight` of the device and as it is arranged to roll on the surface of the commutatoras the device advances in the cutting operation, it facilitates the cutting and it Oife-rs no hindrance to the guiding and depth controlling function of the depth guide G1. The

result of the operation of the device is to cut away the mica insulation strips 82 to a point below the outer surface of the commuta'tor bars 81 and thus provide the slots 84, Fig.A 11, the depth of which slots is controlled as hereinbefore described.

The bracket 68 may be adjusted to -accommodate commutators of different diameters. The roller 69 is provided with a rounded face or tread in vorder to roll readily upon different size commutatore. y

The hollow, spindle has its bore 34l packed with hard grease and this can con-f veniently be accomplished whenever the screw 47 is released to change a saw. lThe entire handle driving shaft and motor is adapted to lie in a plane parallel to the plane of the saw and may readily be moved up and down in that plane without in` any manner disturbing the relation of the saw and the guiding shoe with the slot in which the sawfis working. Y

I claim: n

1. In a device of the class described, a circular slotting saw, a spindle for the saw and a guide lying in the plane of the saw and pivotally mounted concentrically with the spindle of the saw.

. 2. In combination, a saw spindle adapted to carry a saw, a guide adapted to lie in the y same plane as the saw, said guide being pivoted concentrically with the saw spindle,

-a controlling handle in the front end of which said saw spindle is journaled and spring means between said handle and said guide.

3. In combination, a head member, a hanmounted transversely in the head with respect to the handle, a guide member pivot- .ally' mounted on the head concentrically with the saw spindle, a guiding shoe secu-red to said guiding member, said shoe being adapted to lie in substantially the same plane as the saw, a recess said head member, a spring lying in said recess and a pin adapted for transmitting pressure from said spring to said guide member.

4". In combination, a. head member having 100 a transverse saw spindle journaled therein. a saw mounted on said-journaha guide member mounted on the head and adapted to swing concentrically with the saw spindle, a guiding shoe on said guide member, said guiding shoe having a lower edge adapted to lie at all times substantially tangent to the saw.

head having a cylindrical bearing, aguiding member mounted on the, cylindrical bearing, said guide member having a guiding shoe held in substantially the same plane as the saw, a recess in the head, a

spring plunger in said recess 'and a pin*A adapted fortransmitting pressure from said spring to said guide member.

6. In combination, a head having a transverse bearing therethrough, a saw spindle in said bearing, said spindle having a circular saw mounted on oneaend thereof, said head having a cylindrical bearing between the saw and the adjacent portion of the head, a

guide member having a portion journaled on said cylindrical bearing and having a portion extending rearwardly from the saw,

a guiding shoe mounted on said rearwardly Aextending; portion, said shoe being adapted dle secured to said head, a. saw spindle 5. In combination, a head member, a transverse spindle Journaled. in sald head. member, a saw mount-ed on the spmdle, said.

to lie in substantially the same plane as the saw, said he'ad having a recess therein, a

spring plunger in the recess, a pin connected with the plunger and bearing on therearf wardly extendingr portion and a depth controlling shoe closing the outer end of said recess.' c Y 7. In'v combination, a supporting member having a pairv of bearings in vaxialv alinenient, a spindle supported in said bearings,

said spindle -having a hollow bore, transverse lubricating p'assages from the hollow bore to said bearings, a worm Wheel keyed to ,saidv spindle between 'said bearings, a rotary cutting member 'and a screw plug threading into said bore and holding said cutting member onthe end' o said spindle.

8. In a device of the class described, a hollow spindle havingtwo bearing portions, said -spindle having passagew'ays between the bore of the spindle` and the outsideof said bearing portions, la pin passing through saidV spindle' intermediate said bearing -p'or.

tions for providing attaching means for a driving wheel,.said spindle having ashoul` der at Aone *end thereof, adapted to ft against said plug for closing said end a rotary cutter shoulder, a screw of the bore and for clamping the cutter against said shoul der, 'a collar for the other end 'of the spindle and a screw plug threaded into the adja-l cent end of thebore for holdingsaid collar on the end ofthe spindle.

9. In combination, a frame member, a

transverse spindle journaled in said frame member adjacent each end of the spindle, a driving 'gear keyed to the spindle intermediate s bracket bearing a roller on one side of the gear supported on said fra-me member, a rotary cutter secured to the spindle on the other side of said driving gear and a depth controlling '.shoe having a screw threaded adjusting member for clamping the shoe to i the frame member between the rotary cutter `oted with thespindle, a groove between the boss and the driving wheel, a depth controlling shoe lyingin said groove and guided against lateral 'displacement and screw threaded means for controlling the position of the depth controlling shoe and for clamping said shoe to the frame member in said oove.

l1. In a device of the class described, a

y depth controlling in said id bearing portion, an adjustable depth controlling shoe, a vframe member, said frame member having a pair of re-l cesses, one of said recesses beingl screw threaded, la screw pin passing through the -shoe into said threaded recess, a fulcrum pin secured to said shoe and passing into the other recess in said f frame member.

12. Ina device of the class described, a head member, a transverse spindle-journaled y head member, a driving wheel for the spindle, a rotary cutter secured'to the spindle, a cylindrical boss on the head inem- Jber, concentric with the spindle, said boss lying adjacent the rotary cutter, a guide member having an eye fitting over said c1rcular boss, said guidemeinber having a rearivardly extending po'rtion'and a guide shoe secured to said rearwardly extending portion, said guide shoe lying substantially in the plane of said rotary cutter.

' 13. Incombination, a head member having a transverse bearing, a cutter spindle mounted in said transverse bearing, said cutterspindle having a. lubricating opening through the 'side wallthereof, a rotary cutter mounted onthe outer end of s 'aid spindie, and a screw plug for closing the outer end of the bore and forclampng the rotary cutter on thev end of the spindle.

14. In combination, a motor having a circular frame, a hollow frame and handle member having a bell fitting over one side pf the frame 'of the motor, means for clamping said bell to the motor frame, a shaft secured axially in line with the motor shaft,

a head memberl mounted on the outer endv of the frame and handle member, a rotary cutter mounted in said head, said cutter bei ing driven said shaft, a rear handle member having'a bell embracing the opposite side of the frame of the motor, conductors for the motor passingl through said handle member.

15. In combination, a motor having a circularv frame, a hollow frame and handle member having a bell' fitting over one side of the frame of the motor, means for clam'pf ing said bell to the motor frame, a shaft sefcured axially in line with the motor shaft,

a head member mounted on the outer end of the frame and handle member, a rotary cutter mounted in said head, said cutter being driven by Said shaft. a rear handle member having a bell embracing the opposite side of the frame of the motor, conductors for the motor passing through said handle member, and a switch mounted in said handle member atY the rear end-thereof, said switch having a transverse operating member :dapted to project from the sides of.

the handle member.

16. Iii a device of the kind described, a motor, a hollow Ihandle member and a frame member between which themotor is mounted, a shaft mounted within the frame member in axial alinement with the motor shaft, a head member mounted on-the outer end, of the frame member, a rotary cutter mounted in said head, said cutter being adapted to be driven by said shaft, and conductors for the motor passing through said handle. 1

17. In a device of the kind described, a motor, a hollow frame member having an enlarged end for embracing the motor, a shaft secured axially in line With the motor shaft and extending through said frame, a head member mounted on the outer end 0f the frame, a rotary cutter mounted inthe head and adapted to be driven by said shaft, a. rear handle member also havingv an enlarged end for embracing the motor and conductors for the motor passing through said rear handle member.

18. In a device of the kind described, a circular slotting saw, a spindle for the saw,

a guide lying in the plane of the saw and 19. In a device of the kind described, a longitudinally extending handle member, a

.transversely mounted rotatable saw spindle in the slot made by the saw and movable to permit the handle to extend at diierent inclinations. l y

, 20. In a device of the kind described, a longitudinally extending handle member, a transversely mounted rotatable saw spindle at'one end of the handle, a circular slotting saw on the spindle, a 'guide carried by the handle and in the plane of the saw, and having an edge extending substantially tangenti to the periphery of the saw and mounted to swing around the Asaw in the plane thereof, and spring means interposed between the guide and .the handle member for .maintaining the guide 'yieldingly *pressed-:into the saw slot at all inclinations of the' handle.

In witness whereof, I hereunto subscribe my name this 6th day of July, A. D. 1918. FRANK E. AURAND.

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