US903106A - Machine for grinding teeth of gear-wheels. - Google Patents

Description

F. A.'P'H'Efi1 ]s MACHINE FOR GRINDING TEETH 01? GEAR WHEELS.

APPLICATION PHJED HA"! 3, 1906.

Patented ov. 3, 1908.

' ATTORNEYS H F.- A. P E PS, .MAOHINE FOR-GRINDING TEETH 0F GEAR WHEELS.

APPLIOATI ON FILED MAY 3, 1906.

' Patented Nov. 3

7 SHEETS-SHEET 2.

WI 7 IVE 88E 8 BY a 4L ATTORNEYS F. A. PHELPS. MACHINE POE GRINDING TEETH OF GEAR WHEELS.

APPLICATION FILED MAY 3, 1906.

P. A. PHELPS. MACHINE r011 GRINDING TEETH or GEAR WHEELS.

APPLICATION FIL'E-D MAY 3, i906.

Patented Nov. 3, 1908.

7 SHEETS-SHEET 4.

WITNESSES."

Arrmomon FILED MAY 3, 190a.

Pat nted moi- 3, 1908;

ATTORNEY v H PHELPS. MAOHINE FOR. GRINDING TEETH 0F GEAR WHEELS.

APPLICATION FILED MAY 3, 1906.

Patented Nov. 3

7 SHEETS- INVENTOR 1.

' ATTORNEY F. A. PHELPS. MACHINE FOR GRINDING TEETH 0F GEAR WHEELS.

' APPLIOATION FILED MA YS, 1906.

Patented N0vf3, 19.08.

7 SHEETS-SHEET 7.,

I A ttornys.

UNITED;- STATES PATENT or-Ficn.

FREDERIG'KAQ-PHELPS, OF NEWARK, NEW- ERSEY, AssiGNos' To TAYL R IRON & sTEnt COMPANY, or HIGH BRIDGE, NEWJERSEY, A CORPORATION OF NEW JERSEY.

' M'AcmNn-roit qn'mnmdrnnrrror GEAR-mans."

To all whom it"ma'y concern 7 Be it known that. I, FREDERICK-A. Prrnnrs,

a citizen of the United States, residingin Newark, New Jersey, have invented a cer tain'new and useful. Improvement in Ma chines for 'Grinding'Teeth of Gear-Wheels,

- of which the following is a specification.

This invention relates to improvementsin A machines for grinding gears having involute 19' or other shaped teeth, and particularly is of use for grinding gears of very hard material;

The objects of the invention are to render" it possible to grind teeth of wheels made of exceedingly hard materiahto make the bpera-tion take as little time as possible, and .to render it possible'to grind teeth of the true involute shape desired.- Other improvements reside in the shape of the grinder mused, which permits finer teeth being ground,

1 Figure 1 is a top view'of a griiiding ma chine showinga wheel in position, with the grinders in their inmostposition; Fig. 2 is a similar View showing the grinders In their outermost position; Fig. '3 is a side view of the machine shown in Figs. 1 and 2; Fig. 4

is a vertical section thereof taken .on the lines 1-4 of Fig. 2; Fig. 51s a sectionon the lines 55 of Fig. '3; Fig. 6 is a section on the 1ines 6-6 of Fig. 3; Fig. 7 is a section on the lines 7-7 of Fig. 5; Fig. 8 is a section on the lines 88 of Fig. 4; Fig. 9 is a detail on a large scale of the portion of the mechanism shown in 8; Fig. 10 is a-side elevation of the mechanism shown in-Fig. 9; Fig. 11 is a diagrammatical View showing the-operation during the process of grinding the teeth and illustrating the extreme points of'movement of the grinder.

In all the views, like parts are designated by the same referencecharacters,

The machine comprises a base-*1, *which is hollow, preferably. of cast iron. This. base has a cylindrical extension 2, within whieh is mounted the reciprocating support 3,

which carries'the'wheel'tobe ground, and which is reciprocated up and down during the grinding operation. The frame hasan extension 4 (see Fig. 5) which is closed by a man-hole cover 5. The main shaft 6 is horizontal, and is carried in bearings within Specification of Letters Patent. Application filed May'3, 1906. Serial in. 314,926.

- Patented N05. 3, 190's! ried in a removable platesothat'the. shaft,

the frame 1. One of these bearings'7 iso'ar- .can be taken out and put in. The shaft is I rotated. by means. of a -spur gear 8, which engages with a pinion 9 carried on a countershaft 10, apulley 11 is mounted on the hub of the pinion 9 and rotates the pinion, gear and shaft' 6. The shaft 6'is provided with .a crank 12, to which is connected a pitrnan] 13, and this pitman is connected by means of a pin 14,'to the support 3, and serves to reciprocate it in a vertical direction. Thesupport 3 is h'ollow,'as Shown. 1

In the extension 4 of the frame 1, are two vertical shafts 15 and 16. The shaft 15 is mounted-ina bearing 17 on the support 3, and a bearing 18 at the top of the extension 4. The shaft 16 is mounted in bearings 19 I I and 20 in the bottom and top of'the extension 4. The shaft1'5 is rotated by means of the shaft 6 throughthe agency of a worm 21, and worm; wheel 22, the first being ca'r ried by the shaft 6 and the secondby the. shaft 15. Theproportion of reduction may be varied asoccasions require, the' illustration showing it to be a reduction of about 1 in 36; in other words, the shaft 15 will-be rotated once to every 36 times the shaft 6 is turned. The shaft l5 isfa'dapted to'be reci'procated in time with the support 3, through the agency of't'he bearing 17. C01- la-rs 17 on the shaft 15,. and on each side of the bearing 17, compelthei shaft to' reciprocate with the.bearing. The worm wheel 22 has. an extended, hub 22*" which enters a bearing 22", a collar 22 holding itin place.

- The shaft 15 lies within the worm wheel-and hub, and is' rotated thereby by means of a feather 15. The shaft 15 carries a cam 23. This cam is shown in Fig. 7, to be formed .inthe shape of a spiral for nearly the entire circumference of the cam, the two ends of the spiral being connected together by a sharp shoulder. This cam serves to oscillate the shaft 16 through the agency of an arm 24, which carries a stud 25 which engages with the cam slot. The shaft 15 actuates the locking and indexing mechanism for holding the wheel in position while the tooth is being ground, and for advancing it the space ofa roothso as. to present it in po- I sition forgrinding a new tooth. The shaft 16 actuates the grinder'means for ,moving thegrinder in the proper path to grind the tooth to the proper shape and size. The

the wheelFrest s anda collerfwhich passes position after it is adjusted. A suitable ball bearing 1 the wheel 26, and the water used'in grindbearing of the support 3-.

as a bolt-29. The support 3 is provided,-

the table maybe rotatedupon the support"- 3 ball bearing is useful,

. A depending apron 35 having an outward -35 constitutes 'receptacle 40, forming a portionof the- .frame 1.

' mit the accommodation of mechanism within them, chambers by means of a partition as shown develop the proper tooth.

wheel 26 which is being ground is supported I upon a table 27 ,hav-ing- ;a.-flange upon (which through 'the centerbore of the whe'elJThis table is made-removable,'so that another of diiterent size may be. Substituted; when a wheel of different sizeis being ground. The table 27 rests upon a rotating table 28, which also is provided with a flange andla collar, 1 the collar being inserted within the center of the collar of the. preceding table. Both tables are secured together by anymeans such with a centrally rising pin 30. which passes through the collars of both tables. The upper extremity of the pin is threaded as shown-and is provided with lock nuts 31, which-upon being applied, will prevent the table. 28 from rising. A dog. 32 is also ap--- plied to the screwthreads and has depending bolts 33, which ngage against the upper edg'eof the-hub of the Wheel to hold it in .34 is interposed between the up? per face of the support 3, and the lower face of'the flange of the table 28,. so that 3 with a minimum amount of friction.) A owing to the great weight of. the wheel which is beingground, and the necessity of a quick movement of the wheel by the feeding and indexing mechanism, which will be described. I

.the'head." I; ;;The heads are provided each .withaboss '95 acrank 61, carried by which is retained in place by means of a,

bolt 46. This stud and collar 45 pass through thetable'42. "The table 42. is also provided with an overhanging ortion 48, which engages a flange 4C9 forming a part of thehead 41, and serves as a a head downagai'nst the table. gib 50'with ad u sting bolts 51 may be provided to take upthe wear. The head is also held in proper position bymeans of straps 52 which are connected to the side of the table 42, which is rounded for the purpose (see Fig, 6) and cross'and-are connected at their other endsto the 'sides of the'heads at 53. Two straps-are shown for each head, -'one being above the other.v

Suitable de-;

a slot. 47' (see "Fig. 11 formed i T further means of holding A- suitable 1 vices are provlded for taking up the stretch Y of the"s'traps,jalso to adjust the positionof "thehead-and the curved surfaces. In addition to these devices, 'springs 5 l are provided which surround pins 55, These pins are secured to the table 42 and enter suitable openings on the innerfaces of the heads. The springs engage-between thewashers 56 held in place by bolts '57 ,and curved face wash rthe inner walls of ers 58, which engage-lwit 59, to which, is connected 'a rod 60, which in turn 1s connectedto the shaft 16. The'sh aft 16 being given-the 'oscillatory movementas already described,

extending lower edge, serves to collect'the. abraded material removed from the teeth on I ing. .Inside of the apron35 is a tubular member: 36, having ratchet teethf37 on its periphery, which constitutes a portion of the feeding mechanism.- 'Inside of this tubular member is a circular series of teeth 38, which.

a. portion of the locking and indexing mechanism. The upperouter edgev of the support .3 carries a petticoat 39, whose lower edge is constantlysubmerged in water or other liquid contained in an annular This bath, acts as a seal .and prevents the entrance of dust or dirt into the The grinder heads 41 are carried upon tables a2, formed integral with the frame '1, and carry the grinders 43. The heads are madehollow' for lightness, and also to perand are preferably divided into two in Fig. 6. The heads 41 are oscillated'durwill oscillate the'twoheads H L1 in unison, I

'r'noving' one in onedir'ection and the other. in-

.so that the two teeth the other 'direction, .will be simultaneously cut, v The straps are for: the purpose of giving Theyinsurc that a given point in the head.

the curved surface. They effect of the two curved surfaces one upon the tooth. If the strapswere omitted, this would not necessarily result; The springs hold the two surfaces always in contact. "the vspringswere omitted the two parts would not would not be held against thework, j The locking and indexing mechanism as the shaft'15. This shaft at its upper extremity. The periphery -of this wheel is provided with the cam slot 63, of the shape shown in Fig. 10. Within this cam slot engages a finger 64,;which is carriedup'ou a pin 65, which passes througha bearing (36. The otherend of thepin 65 is ing' the grinding operation, and also bodily moved around a circular surface so as to shape of the involute In order .to hold them in position, they are provided with a depending extenin the form of a finger 67 This finger is adapted to engage between two of the proj'ectioiis 38, carried upon the table.2' 7 The finger (37 may be formed point, so that it will be self-centering besion or stud a l, surrounded by a collar l5 tween the projections 38. This finger conhe heldi'n contact and the grinder the proper movement to the grinding heads, .I

willqalways come'opp'osite a given point' n produce a'rollmg I the other, and developthe involute shape of u 1'10 already described is actuated by means of:

15"has a wheel 62 with a sharpened Y attempted to grind a fine pitch gear with a through the wheel 62.

stitutes a lock for the table and the indexing device, and is automatically drawn out and inserted in place by means of the actionof the projection 64 in thecam slot 63. .As

shown in Fig. 10, this cam slot 63 is formed feeding mechanism is also actuatedby means.

of the wheel 62; r This wheel in addition to carrying the cam slot '63 carries a pin 68, This pin projects the teeth 37, and intermittently rotate the table 27, and with it the wheel 26. Means 'is provided for-adj usting tlieposition of the pin 68 so as to accommodate it for use with tables of different sizes, which are necessary for use with wheels of difierent sizes. The pin 68 is carried upon a support 69, which slides in ways.formedin a transverse slot This support is adjusted in position by means of the screw 70, having a projecting head 71 to whichthe wrench may be applied.

The grinding tools 43 are each in the formof a'disk of abrasive. material. Means, not shown, is provided for supplying water. to the grinding surface. a,

A very important part of the invention resides in making the grinder of sucha type that'it engages at its'edge with the tooth being ground, in -contradistinction from engagement with one face or a corner, which is the case in previousforms-of machines.

Among the advantages which reside-in having the grinder engage at its periphery are that it can grindfiner teeth, as the grinderc'an-be thinner than one which engages with one face. Another advantageis that-as the grinder wears it merely decreases in diameter and not in thickness. If it should be face engagingv grinder, as thegrinder wore it wouldbecome' thinner, and liable to breakage; .The support forieach tool is alike and consists of a shaft 72, which'is mounted in bearings on a subframe 73. The shaft 72 is provided with a pulley 74, with which a hub may be engaged for rotating the shaft and grinding wheel at .the proper-rate of speed. The subframe 72 is supported upon the main part of the head 41 by a dove: tailed joint shownin Fig. 4,. and thepai'ts are so arranged that thesubframe may be moved along the head toward and. away from the wheel which is being ground so as to accommodate the wear of the gr nding tool andalso'to accommodate different sized wheels which are being ground. One means for feeding the tool against the work is shown. This consists of a bolt 75 carried in a bearing 7 5 on the head and which althe grinder.

- erate. one-half a revolution, one face-ofall the lows the bolt to engage with the 's ubfraine 'in such a manner that it can be fed forward.

-The operation of'the machine isas fol-' lows: The wheel which is to be ground is placed upon the table 27 and surrounds the oollarof such table. 'It is properly adjusted in relation to the teeth 38,.by means of the I plied to the pulley 11, will rotate the shaft 6,

the shaft 15, and give the oscillatory movement to the shaft 16. The support 3 will be reciprooated carrying withit the table 27 and the wheel 26 'While'the wheel is being reciprocated, the shaftsilo and 16 will be fslowly rotated and oscillated; The 'actionof thegrinderis more clearly shown in Fig. 11. Itstarts in the full line positionshown at the outer edge of'the teeth and gradually works into a position on the side of .the tooth, the. wheel being constantly reciprocated so that every portion of the surface of th t side of the tooth will be acted upon by Owing to the manner of, mounting the heads, arid-connecting them to the curved surface of the table 42, by the. bands or strips-52,' the grinding'edge of the grinder will describe a path ofa true involute. When the grinder has reached the base of the tooth the shaft 15 will havemade nearly a complete revolution. The pin.'25.

engaging with the cam 23'will at this time enter the distorted portion ofthe cam slot,

. andquickly reverse the; movement of the arm 24 and shaft 16. This will cause a quick return motion to the heads 414L- enter the slot in the table-andinde'x the. wheel. The action will then berepeated As shown in the drawings, two grlndlng; tools are employed' They attack the'wheel on opposite points and simultaneously op- Therefore after the wheel has made teeth will have been ground. The wheel may then be removed, reversed and returned to positioiu'and th'e other faces of the teeth ground.

105. While this is occurring a finger 64 will be. e

the grinding tool. The finger 67 will then The machine. itv will be seen, operates by'125 grinding the face of the teeth from the out- I side toward the inside. Thisis an-important improvementespecially when the ma chine is applied to. -the grinding of wheels of excessively hard material. Such wheels which the tooth is groundby the tool travel-- are any imperfectlons in' the casting, the

are. usually cast and imperfections are formed in the casting, In machines in ing from inward outwardly, the tool is first positioned bybeinggbr'ou'ght in close contact to the surfaceto' be ground. If there grinding tool will strike these during the quick motion necessary. inorden to bring it into position. or destroying the grinding tool. 1

, According to the resent grinding being done from the outside to- ,wards the center, and the tool being slowly 'fed in Ztbjtlle rate necessary to secure the: proper abrasive action, if the toolcomes into contact with --any "imperfections it will; slowly grind themYdown without being in-.

jure

20, Another great advantage incidenfltothe present invent-ion is the possibility of 'avoid- ,ingvthe use of'a master wheel, the develop-Y meat of the involute being made directly by the rocking movement ofthe grinder headupon the curved surface. *Theuse'of a masactly like the cutter. (3), There is error. in the transfer mechanism between the tracing finger and the grinder,.whi ch may magnifyon decrease the errors in the'master, or make new errors and :(l) there 'are errors in' the v mo\ ement-v.l of a the grinder in "engagement. with the: wheel, and which is being ground.

- IB,y =my'l'pr-esentinvention, I- avoid these en-ms, and make it possible to accurately the shape of the tooth.

grind teeth of allsizes, as it is notnecessary to havea"masterbrother. forum 0 develop The improvements hereinidisclosed' are not limited to the machine illustrated, as

' they may be used; connection .with other forms of machines; v One 'form of 'machlne' which they may-use'inconnection with this is that disclosed a joint application for 'patent'filed b'y-mysel'f and Charles G, Atha', I filed May 16,1905, Serial No. 260,617.

Having nowldescribed my invention, what i I claim as new and. desire to secure by Letters Patent, is: r v i .1. In a machine 'for grinding the teeth of gear wheels, the combination with meansfor supporting a wheel, of a grinder, and means for'en'gaging the edge of the grinder on the line of the spur tooth, and between the teeth of the wheel. 1

2.111 a machine for grinding the teeth of This will result in damaging lnilention, the

grinder in JtOObhd f engaging'the edge of the grinder between the teethofthe wheel, and means for reciprocating the wheel, to cause theigrinderto engage with the tooth throughoutlit's depth;

" 3. InaZmachine for'grinding the teeth'of spur gear wheels, the-combination with a support for the wheel, of .a grinder, means I for engaging the grinder'with-a'tooth of the. a

wheel, means formov'ing-the grinder in a path of a true involu-t'e-vin'engagement with supporting a' wheel, of a grinder,jmeans for i thewheel on the, line off-a'spur tooth, ,and'

means for: disengaging the grinder from the wheel" and returning 1t'- out of contact with ,the wheel.

4c. In a machine'for grinding the teeth ofspur gear wheels, the" combination with. a

support for the wheel, of a grinder, means for engaging the grinder with a tooth of'the wheel, meansfor movingsthegrinder in a path of'a true ini*oli1te on the line-of a spur tooth, m'eans' fo r --diseng aging the grinder from' -the wheel, and means for relatively osition for grinding another I 5. In ,almachine' for grinding the teeth of.

geanwheels, the combination with a support forthe' 'wheehof a grinder, a'grinder head,

and means for moving the grinder-in the path of'fan involute on the line of a spur tooth, the said? means comprising rock ng .movingj'theg'rinder and wheel, to place the members and means for holding the memberslin engagement.

6. In amachine for grinding the teeth of gear wheels, the combination with a support to the wheel, a grinder and-means for mow ingtheg'rinder in the path of an involute,

the said meanscomprismg a' member having a' curved -surface, a member having a plane surface, flexible means for holding the sur afaes together, and means for rocking one surface upon the other.

7.111- a machine for'grinding the teeth of gear Wheels, the-combination with ineansfor supporting the wheel, of a grinder,'a grinder head, the said grinder-head engaging with a curved surface, straps j for determining the proper relatlon of the grinder. head to the curved surface, means for engaging the means-for rocking the grinder-head to cause grinder-head with the curved-surface and theigrinder to describe the pathof an in- Volute. v 8. In a machine for grindingthe teeth of gear wheels, the combination with a support vfor the wheel, of a grinder and grinder head,

a member having a curved surface engag mg with the grmderhead, straps connecting the grinder head and curved surface, elastic means forengaging the grinderhead withthe curved surface, and means for rolling the v grinder head upon ;the curved surface to cause the grinder to describe the path of an L I gear wheels, the combination with means for l lnvolute.

tated byfhe worm gear, and another shaft 7 gear wheels, the combination of a frame wheel to be ground, a set of ratchet teeth enga e between the teeth of the wheel with its edge,

-rotatedby the worm gear, and means ace ;tuatd:jby the two shafts for operating the I -n a'machine-for grinding the teeth carried by the support and adapted to rosupportingj'thewheel,a worm carried by the shaft,-a worm wheel in engagement therewith ment with the worm wheel, a third shaft having a member engaging with the cam by means of which it is reciprocated, a rinder, a grinder head, the said grinder hea engag "tfio ns between .the reciprocating shaft and grinder head for reciprocating it.

liquid seal, inclosing the support.

,ber having a pin adapted to engage with the ratchet teeth and intermittently rotate the table.

of gear wheels, the combination with a sup- "and'rec'iprocating supportfor the wheel, a

connected to' the table, and by means of. which 1t may be rotated, and a rotary meni- 11. In a machine for grinding the teeth port for thewheel, of a grinder adapted to and means for feeding the grinder in relation .to the wheel, as the grinder wears ay 12; In a machine for grinding the teeth bfgear wheels, the combination with means for supporting the wheel, a shaft, a worm gearthereon, a 'wormwheel in engagement with theQworm gear, a shaft directly roindirectlyrecipro'cated by means of a cam mechanism for grinding the wheel.

of gear wheelathe combination of a frame and-connections between'th'e shaft and support for reciprocating the latter, a table tate thereon, means carried by the table for and carrying a cam, a second shaft in engageingwith a fixed curved surface, and connec- In a machine for rinding the teeth of. gear wheels, the comblnation of a frame I .and reciprocating support for the wheel.

andjconnections between the shaft and support for reciprocating the latter, a l table carried by the support and adapted to rotate thereon, means carried by the table .55

for supporting the wheel,'-a worm carried vby-the shaft, a worm wheel 'in engagement -',th erewith and carrying a cam, a second shaft fineng'agement with-the worm wheel, a third shaft havingamember engaging with thecam 'bymeans .of which it is reciprocated, afgrinder, agrinder head, the said grinder head engaging with a fixed curved surface, connections between the reciprocating shaft andl'gr'indei" head for reciprocating 1t, and

means for feeding the grinder against the work.

.15. In -a machine for grinding the teeth of gear wheels, the combination of a-frame and reciprocating support for the Wheel, a shaft and connections between the shaft and support for reciprocating the latter, a table carried by the support and adapted to rotate thereon, means carried by theitable for supporting the wheel, a worm carried by the shaft, a v'orm wheel in engagement therewith and Lrrying a cam, a second shaft inengagement with the wormwheeha third shaft having a, member engaging with the cam by "means of which it. is reciprocated, a vgrinder, a grinder head, the said grinder head engaging with a fixed curved surface, springs for engaging the grinder head against the curved surface, and connections between the reciprocating shaft and grinder head for reciprocating it,

16. In a machine for grinding the teeth .of

gear wheels, the combination of a frame, and reciprocating support for the wheel, a shaft and connections between the shaft and sup port for reciprocating the latter, a table carried by the support and adapted to rotate thereon,..means carried by the table for supporting the wheel, a worm carried by the shaft, a worm Wheel in engagement therewith and carrying a cam, a second shaft in engagement with the worm wheel, a third shaft having a member engaging with the cam by means of which it is reciprocated, a grinder, a grinder head, the said grinder h'ead engaging with a fixed curved surface,

springs for engaging the grinder head, against the .curvedsurface, connections be-.

tween the reciprocating shaft and grinder head for. reciprocating it, and means for feeding the grinder againstthe work.

17. In a machine for grinding the teeth of gear wheel.s,-the combination of a frameand reciprocating support for thewheel, a shaft I and connections betwee'n the shaft and support for reciprocating the latter, a table carried by the support and adapted to rotate,

thereon, means carried by the table for supporting the wheel, a worm carried by the shaft, aworm wheel in engagement therewith and carrying a cam, a second shaft in engagement-with the worm wheel, a third shaft having a -member engaging with the cam by means of which it is reciprocated, a

grindeija grinder head, the said grinder head engaging with a fixed curved surface, straps connecting the grinder head .and curved surface, springs for enga ing the grinderhead against the curved sur ace, connectionsbetween the reciprocating shaft and I grinder head for reciprocating it, and means for feeding the grinder against the work.

18. In amachme for grindi-n the, teeth of. gear wheels, the combination o a frame and successiyei afihe. t

- ing a cam,

reciprocating support for thewhcei, a shaft and connections between the shaft. and support for reciprocating the latter, a table-carried by the support and adapted to rotate.

carried by the table for supporting the:

wheel, a worm carried by theshaft, a worm wheel in engagement therewith and 'carry-' a second. shaft in engagement withthe worm wheei, but free, to slide 1engthw1se"therein, means carried by the support for reciprocatingthe shaft. in time' a v.third shaft 'having a member therewith, engaging withthe-cam by, which -it is reciprocated, a grinder, a grinder head, the said and curved surface, springs for enga in'g grinder head surface, straps connecting-the grinder head the grinder head against the curvedsnr ace,

Worm carried the-shaft, a worm in engagement "therewith and carrying a 3 gear'wheels,

. and connections between the shaftaand' sup- 7 port for reciprocating theiattegaj table; car-' ried. by the support and adapted t'o' rotate thereon, ..ratche't teeth on the table," means connections betweenv the reciprocating shaft and grinder head for reciprocating it,- and. means for feeding the grinder against the .Work.

19. Ina machine forjgrindingithe teeth of reciprocating support, for the Wheel, a shaft carried by th'etablez for supporting the'wheel,

cani,-a second shaft in eng'age'ment with the a a 'worniwheel, a third shaft having a member.

' it is reci shaft an engagingyviththe"cam by. means of which. rocated, "a cra'nlrrotated by the grinder head for reciprocating. it.

i su' i h f 20; In amachineforgrinding theteethofgear wheeis,the-combination or a frame and reciprocating support forthe wheei a shaft v and"connectionsibetween,the shaft; and sup-. por'tfor reciprocating the 1att'er, a"tab1e car- 5 ried by 'the supportta ndadapted to rotate I thereon, ratchet teeth 'on. the tab1e,'a grinder,

the reciprocating shaft and grinder head for feedin thegrinder againstthe' work, a crank rotate bythersecond shaft and adapted: to

,-'mea ns. carried by, the' table for with'aiid' carrying a, cam,v ase'cond shaft in a cam' carried: by the second rotating and ried by carried by the table for engaging with afixed curved.

the; combination of a-- frame and wheel 1 s e reciprocated, a crank-rotated by shaft and adapted to successively engage 4 adapted to-siiccessively engage with the ratchet/teeth on thetable, a grinder,-

' 'a-grinde'rhead, the said'grinder hea'd engagthe hitter,

a grinder head, th esaid grinder head engag recipro'cating T it, and. means for;

engage with the ratchet teeth pfiortingthewheel, a worm carried by the a ,"affw r1nwhee1 in engagement-theref engagement 'withj the worm 'wheel, anda third shafthaving a member engaging with the cam by means oflwhich it is reciprocated' 21. Inamachine for grinding the teeth of. gear wheels,.the combination of a frame and reciprocating support for the whe'eha shaft and;connections etween the shaft and sup" .port for reciprocating the latter, a table carthe siipport and adapted to, rotate ratchet teethcn "the table, "means supporting thewheei, .a Worm carried by the shaft, aw'orm wheel thereon,

.in engagement therewith and carrying a cain,

a'se'cond shaft in engagement with the Worm wheei, a third shaft having a member. engaging with thecam by means of whichit is reciprocated, a grinder, a ;gri nder head, the

said grinder head engaging-witha fixedcurved surface, springs for enga ing the grinderhead against the curved sari successi-vely engage with the'ratchetteeth on I Q 22. Inamachine for grinding thetieeth of combination ofa-fi'amejand Y the table.

gear wheels, the p reciprocating support for the wheel, a shaft.

andjco "nections between the. shaft" andfsup;- ,port formeciprocating the latter, a:

. 1 ried-by thesupportand' adapted'te ot'ate table for supporting the-wheel,

in engagement therewith and carrying a cam, aseco nd wheel,- a third shaft having a member "e n.

with the cam by ineanso'f which it is i the second ac'e,'con-- v nectionsbetweenthe.reciprocating shaft, andgrinder head for. 'reciprocating-.1t, a. crank rotated byfthe-seconl shaft and adapted to thereon, ratchet teeth-on thetab1e,.,ineans carried byithe ajwo'rm carriedby the shaft, a wormwhe'el' haft-in-engagement with the' worm v with the ratchet teeth-onthe table, a gri-n'deigf.

a grinder 'ing with head, the said grinderhead engag a fixed 'eurved'surface, straps connecting the grinder head and curved surface, and .connections between the reciprocating shaft and grinder head for reciprocating 1t.

shaft having a member 'teethIon the table, means carried by the table engagement-withthe worm wheel, athird engaging with the cam by means of-which it is reciprocated, a

crank" rotated by "the second shaftand adapted to successivelyengage with the ratchet teeth on the. table, a grinder, a grinder hea'd',-the said grinder'head engaging I with a fixed curved surface, straps connecting the grinder head and curved surface, connections between the reciprocating shaft and grinder' head for ,reciprocating lt, and

'. means for feeding the grinder against the work. I

24. In a machine for grinding the teeth of gear wheels, the combination of a frame-and reciprocating support for the wheel, a' shaft and connections between the shaft and support for reciprocating the latter, a table carried by the support and adapted to rotate thereon, means carried by the table for supporting the wheel, a'w'orm carried by the shaft, a worm wheel in engagement therewith and carrying a cam, a second shaft in engagement with the worm wheel, but free to slide lengthwise therein, means carried by the'support for reciprocatin the shaft in time therewith, athird shaft having a member engaging with the cam by means, of which it is reciprocated, a grinder, a grinder head, the said grinder head engaging with a fixed curved surface, and connections between-the reciprocating shaft and grinder head for reciprocating it.

25. In a-machlne for grinding the teeth 'gear wheels, the combmationof a frame and to slide lengthwise therein, means carried-by the support for reciprocating the shaft in time'therewith, a third shaft having a member engaging with the cam by means of WlllCll it'is reciprocated, a grinder, a grinder head, the said grinder head engaging with a fixed curved surface, connections between the reciprocating shaftand grinder head for reciprocating 1t, and means-for feeding the grinder against the work.

support for reciprocating the latter, a table ,'2 6.-In' a machine for grinding the teeth of gear wheels, the combination of a frame and reciprccating support for the wheel, ,a

shaft and connections between the shaft and carried by the support and adapted to rotate -thereon, means carried by the table for supporting the wheel, a Worm carried by the shaft, a worm wheel in engagement therewith and carrying a cam, a;second shaft in engagement with the wormwheel, but free to slide lengthwise the-re n, means carried by thesupport for reclprocating the. shaft in time therewith, a third shaft being a member engaging with the cam by means of .which it is reciprocated, a grinder, a grinder;

head, the said grinder head engaging with a fixed curved surface, springs for engaging the grmder head again-st the -.curyed sureating it.

means for feeding face, and connections between the reciprocating shaft and grinder head for recipro- 27. In a machine for grindingthe teeth of gear wheels, the combination ofa-frarne and reciprocating support for the wheeh aishaft and connections between the shaft and support for reciprocating 'thelatter,a tabfe'lcarried by the support and adaptedftwr otate thereon, means carried by the table or sup porting the wheel, a worm, carried by vthe shaft, a worm wheel in engagement therewith and carrying a cam, asecond shaft in engagement with the worm-wheel, but free to slide lengthwise therein, means, carried by the support for reciprocating "the shaft, in

time therewith, a'third shaft having a meni ber engaging with the cam by means of which it is reciprocated, a rinder, a grinderhead, the said grinder hea engaging with a fixed curved-surface, springs for engaging. the grinder head against the cur'ved surface,

connections between the reciprocating shaft and grinder head for reciprocating it, and thegrinder against the work.

28. In a machine for grinding the teeth of gearwhels, the-combina-tion of a frame and reciprocating support for the wheel, a shaft and connections between the shaft" and sup-- port for reciprocating the latter, a table ca rried by the support and adapted to "rotate thereon and a: series of indexing teeth thereon, means carried by the table for support-- ing the wheel, a worm carried by the shaft,

' a worm wheel in engagement therewith and carrying a cam, a second shaft 1n engagement with the worm wheel, a cam carried by.

the second rotating-shaft, a finger engaging with the cam, and adapted to engage-between the indexing teeth carriedby the 1:0:

tating table, a third shaft hailing a member it is 'reciprocated', .a grinder, a grinder head, the said grinder head engaging with a fixed curved surface, and connectionsbet-ween the .engaging with the cam by means of which reciprocating shaft and grinder headfor reciprocating 1t.

reciprocating support fpr the wheel,"a'shaft 29. In a machine for grindingitheteethnf gear wheels,'the combination of a; frame and.

its

and connections between the shaft 'and sujpport for reciprocating the latter, atable carried'by the supportand adapted to rotate thereon, and a series of indexing teeththere on, means carried bythe table for support ing the wheel, 'a worm carried by the shaft. a worm wheel in "engagement therewith and carrying a ca mga second shaftin engage ment'With-the worm wheel, a ca' n'carriedby the second rotating shaft, a finger engaging with the cam, and .adaptedrto .engage betating table, a third shaft having a nieinbe'r engaging with 'thevcam by meansof which tweentheindexing teeth "carriedby the ro.-

' gear wheels, the combination of a frame and it is r'eciprocated, a grinder, agr'inder head, the said grinderhead engaging wlth a fixed curved surface, connectlons between the reciprocating shaft, and grinder head for re-' c1procat1ng 1t, and-means for feeding the grinder against the work.

- 30. In a machine for grinding the teeth of reciprocating support for-the wheel, a shaft and connections bet-ween'the' shaft and support for reciprocating the latter, atable carriedby thesupport and adapted-to rotate thereon, and a series ofindexing teeth thereon, means carried bythe table for supporting the wheel, a worm carried by the shaft,

a worm wheelin engagement therewith and carrying a cam, asecond shaft m engage it is reciprocated, a grinder, a grinder head,

' curved surface, springs for engaging the.

the said grinder head engaging with a fixed grinder head. against the curved surface,

connections betweenthe reciprocating shaft j and rinder head for reciprocating 1t, and

means for'feeding the grinder against the port for eating the shaft intimetherewith, a third camby means of which it is reciprocateiafi t 'grinder a grinder head, thev jsaid grinderfj head engaging'withafixedreurved surface," springs for vengaging. the j grinder head. against the curved surfacepand connectionsv betweenv the. reciprocating shaftjl and grinder head for reciprocating Qit, means for 31. Ina machine for grinding the teeth of gear wheels, the combination of a frame and reciprocating support for the wheel, a shaft and connections between the shaft and supreciprocating the latter, a table carried by the "support and adapted to rotate and a series of indexing teeth theretable for supporton, means carried by the ing the wheel, a worm carried. by the shaft,

a worm wheel inengagement therewith and carrying a -cam, r 'ment with the worm Wheehbut free to slide lengthwisethereim'a cam carried by '-the.sec- 0nd rotatingjshaft,a"-finger engaging withv the cam, and adapted to engage between the indexing teethcarried by the rotating table, a

means carried'by lthe supportfor recipro shaft having a member engaging. with the feeding the grinder; against the work.

ried by the support and adapted to rotate; thereon, and a series oftindexing teeth there a secondshaft. in engage- I on, means carried by the table for support ing the wheel, a worm carried by the shaft, a worm wheel in engagement therewith and carrying-a cam, a second shaft in engagement with the worm wheel, acam carried by the second rotating shaft, a fingerengaging with the cam, and adapted to engage between the indexing teeth carried by the ro-' tating table, a third shaft having a member engaging with the cam by .means of which it is reciprocated, a grinder, agrinde r head, the said grinder head engaging with a fixedcurved surface, straps connectingthe grinder head and curved surface, connections be-' tween the reciprocating ,shaft and grinder head for reciprocatingityand means for feeding the grinder against the WOI'k.

' I 33. In a machine for grinding the teeth of gear wheels, the combination of a frame and reciprocating support for'the'wheel, ashaft and connections betweenthe shaft and sup-L port for reciprocatingthe latter, a table carried by the support and adapted to rotate thereon, ratchet teeth on the table, means carried by thetable for supporting the wheel, a worm carried: by the shaft, a'worm wheel in engagement therewith'and'carrying a cam, 'a second shaft, in engagement, with the worm wheeha thlrd shaft having a member engaging with the cam by means of which it isreciprocated, a crank rotated by the second shaft and adapted to successively engage with the ratchet teeth on the table,

anda series of indexing teeth thereon, a cam carried by the secondrotating shaft,a finger engaging with the cam, and adapted to I engage between the indexing teeth carried by the rotating table, a grinder, a grinder head, the saidgrinderhead engaging with a fixed curved surface, straps connecting the grinder head and curved surface, .connections between the reciprocating shaft and grinder head for reciprocating it, and means for feeding theig'rinder against the work.

'34. Ina machine for grinding; the teeth of gearwheels. the combination of'a' frame and reciprocating support for the wheel, a

shaft and connections-between the shaft and s'upportforreciprocating the latter, a table 'carried by'the support-and adaptedto rotate thereon, ratchet teeth on the table, means carried by the table for supporting the wheel,

a worm carried: the shaft, a worm wheel fin yilga'gament; therewithjand' carryin a cam, a second shaftlin-jengagement with the worm \7vl 1'ee1-,- a third shaft haying a member engaging withfthelicam; by fmean's off which age with the,fratchetzteethfon the table, and

series ofjin deiiing teeth thereon, a cam carried 'b'y'theis'econd rotating shaft, a fingerenbetweenithe indexin teeth carried-b t e rotating table,a grin er, a grinder head', the

it '1s;rec procated,.ia crank-rotated by thefIn amachinefor. ,grindingthe teethof gear wheels, the combination 'of a frame and; reciprocating' support for the wheel, a shaft; and connections between the shaft and sup-.- port for reciprocatingthe latter, a table car haft. and adapted [to successively en said grinder head engaging with a fixed. curved surface, straps connecting the grinder ing the grinder head against the curved surface; connections; between thereciprocating shaft and grinder head for reciprocating it,

and means for thewo'rln.

feed ng the grinder against head and curved surface, springs for engag- 35.3 Ina 'machiiie z-for grinding the teeth of,

thereon; ratchet teeth on theficable, means lcarried by the table for s11 porting the ."wheel in engagement therewithand carrying ,iaz-cain, a second shaft iiiengag'ement with ,'in,-'means carried by the support for recipro- -cating the shaft in time therewith, a third wormwheel,but free to slide lengthwise therewheelfa worm carried by the s .aft,'.a w'orm I 's'ha' ft having amember engagingwith thecam bymeans of which it is reciprocated,a crank rotated by the second shaft and adapted to successively engage with the ratchet teeth on the table, 'and. ;a 'series'of indexing teeth thereon, a cam carried by the second ro tat-- ing shaft, a finger engaging with the cam, and adapted to engage between the indexing teeth carried by the rotating table, a grinder,

a grinder head, engaging with a fixed surface, straps connecting .the grinder head and.

curved surface, springs for engaging the grinder head against the" curved surface, connectionsbetween' the reciprocating shaft and grinder head for reciprocating it, and means for feeding the grinder against the work.

, 36. In a machine for grinding the teeth of '40 gear wheels, the combination of a frame and reciprocating support for the wheel,,a shaft and connections betweenjthe'shaft and supl port for reciprocating the'latter, a table carried by the support and adapted to rotate thereon, ratchet teeth on the table, means carried by the table for supporting the wheel, a worm carried by the shaft, a worm wheel in engagainent therewith and carrying a cam, a second shaft in engagement --with the worm wheel, butfree to slide lengthwise I I therein, means carried by the support for rea grinder, a grinder head, the said grinder ciprocating the shaft in time therewith, a third shaft having a member engagingwith the cam by means of which it is reciprocated, a, crank rotated by the second shaft and adapted to successively engage with the ratchet teeth on the table, and a series of in-' dexing teeth thereon, a cam carried by the second rotating shaft, a finger engaging with the cam, and adapted to engage between the indexing teeth carried by the rotating table,

head engaging with av fixed curved surface, straps connecting the grinder head and curved surface, springs for engaging the connections between the reciprocating shaft and'grinder head for reciprocating'it.

' 37. In a machine for grinding the teeth of. gearwheels, the combination of a frame and reciprocating support for the wheel, a

grinder head against the curved surface andshaft and connectionsbetwee i the shaft and support forzreciprocating the latter, a-table carried by the support and adaptedto rotate thereon, ratchet teeth on the table, means carriedby' the table for supporting the wheel, a worn 'carried by the shaft, a worm wheel in engagement therewith and carrying a cam, a; second shaft iirengagement Wliill the worm wheel, but free to slide lengthwise therein, means carried by the support for reciprocating the'shaft in time therewith, a crank rotated by the secondshaft, and adapted to successively engage with the ratchet teeth on the table, a third shaft having a member engaging with the cam by means of which it is reci rocated, a grinder, a grinder head, the sai grinder head engaging with a fixed curved surface,

straps connecting the grinder head and curved surface, springs for engaging the.

grinder head against the curved surface, connections between the reciprocating shaft and grinder head for reciprocating it, and

work. i

means for feeding the grinderfagainst the 38. In "a machine, for-grindingth'e teeth of gear wheels, the combination of a frame 'and reciprocating support for the wheel, a

shaft and connections between the shaft and support for reciprocating the latter, a table. carried bythe support and adapted to rotate thereon,,ratchet teeth on the table, means carried by the table for supporting the wheel, a'worm carried by the shaft, a. worm wheel inengagement therewith and carrying a cam, a second shaft in engagement with the worm wheel, but free to slide lengthwise, means carried by the support'for reciprocatingthe shaft in time therewith, athird shaft having a member engaging with the cam by means of which it is reciprocated, a crank rotated by the second shaft and adapted tosuccessively engage with the ratchet teeth on the table, and a seriesuof indexing teeth thereon, a cam carried by thesecond rotating shaft, a finger engaging with the cam, and adaptedto engage between the indexing teeth carried by the rotating table, a grinder, a grinder head, the said grinder'head engaging with a fixed curved surface, springs for engaging the grinder head. against the curved surface, connections between the reciprocating shaft and grinder head for reciprocating it, and means for feeding the grinder against the work.

39. In a. machine for grinding the teeth of gear wheels, the combination of a frame and recip'i-ocatiiig support for the wheel, a shaft and connections between the shaft and support for ried by thereon,

carried by the reciprocating latter, a table car the support and adapted to rotate ratchet teeth' on-the table, means.

table for. supporting the wheel, a worm carried by the, shaft,- a worm wheel in engagement'therewith and carrying a cam,

' with the worm wheel, but

means earned by the support 1.0 for reciprocating wise therein,

aisecond shaft in engagement free to slide lengththe shaft n time therewith,'a thirdshaft having. a member engaging with the-cam by means of which it is reciprocated, a crank rotated by the second shaft and adapt with the ratchet ed to. successively. engage teeth on the table, and a series of indexing teeth thereon, a cam carried by the second rotating shaft, a finger engaging with the 'cam, and adapted to en age between the t e rotating table,

the said grinder hea engaging with a fixed curved surface,

indexing teeth carried by a IlIldBI, a grlnderhead,

springs for engaging the grinder head against the curved surface,

, connections between and grinder head for recip the reciprocating shaft rocating 1t, and

Fmeans for feed'ngthe grinder against thework.

i 40. In amachine for grindin the teeth of gear Wheels,

reciprocating su and connections 'port for reciprocating the latter, a table carort and; adapted to-rotate ried by the supp the combination 0 a frame and port for the wheel, a shaft etween the shaft and supa cam, a second shaft in enga thereon, ratchet teeth on the table, means 1 carried by the table for supporting the wheel in engagement therewith and carrying ement with the to Side lengthwise worm wheel, but free by the support for therein, means earned wheel, a worm carried by the shaft, a Worm reciprocating the-shaft in time therewith, a

third shaft having a member enga ng with I the cam by means of which it isreciprocated,

a crank rotated by the second shaftjand ratchet teeth on the table,

indexing teeth thereon, 'a cam the cam, and adapted to engage a grinder, a grinder head engag ngwith,

straps connecting the grinder head a1id curved surface, springs connections between the. reciprocating shaft and grinder head for"recipr'ocating it, and

for engaging the grinder head againstthe curved surface,"

means, forfeeding the grinder against the Work.. V v

This specification signed, and witnessed this second, day of May,,1 906.

FREDE IC nrnnLrs.

' a LE NA D H.-DYER,

AUG. Lone;

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