US1600947A - Grinding machine - Google Patents

Description

sept. 21 1926.

H. F. JOSEPH GRINDING MACHINE Original Filed August 7 1920 4 Sheets-Sheet l Sept. 21

H. F. JOSEPH GRINDING MACHINE 4 Sheets-Sheet 2 Orgial Filed August '7 1920 Sept. 21', 1926.

1,600,947 i H. F. JOSEPH Y GRT'DING MAGINE VOriginal Filed Augsfl '7,- 1920 Il VNIIIIIIIII H. F. JOSEPH GRlNDING MACHINE Sept. `21

Original Filed August '7 1920 l4 Sheets-Sheet 4 mechanisms.

l aople and effective Patented selii. 21,1926,-

'U`NiTED STATES PATENT orifice.

HARRY F. JOSEPH, OF DAVENPORT', OWA, ASSIGNOR, BY MESNE ASSIGNMENTS, T0

MICRO MACHINE COMPANY, OF BETTENDORF,

IOWA, A CORPORATION vOF .IOWA.

calunniel iiAcHINE.

. original application 4inea August' 7, 1920, serial No. 401,988, Patent No. 1,396,128,11ate11 November 8,

'1921. Divided and this applicationled October 8, 1521. Serial No. 506,300.

This invention relates to grinding 'machines, and particularly to machines for .grinding the inner vor outer faces of automobile cylinders, pistons, pins, valves, and 5 in fact, all parts commonly found. on automobiles, though it is obvious the invention is not hmited to the use forwhich it is particularly designed, as it mightbe used for grinding cylinders or other parts for other The general object of the invention is to rovide a mechanism 'of thisv character in cluding a grinding wheel which is-rotatable and at the same time may ,be moved, in a '15, circle around the central longitudinal axis ofv revolution ormay be rotated without moving-bodily around the central axis.

A further object in this connection is to provide' means whereby the feed of the grinding wheel may be controlled, this mech- ,anism Ibeing such that the grinding'wheel may be fed 1n 'e'ther direction while the machine is running'. f A further` object is to provide means whereby the rapid adjustment of the grinding wheel may be made by hand when the "mainbearing supporting the grinding wheel f and its parts is idle.

IA further o bject is to rovide very simmeans w ereby the grind- `ing wheel may be adjusted while the spindlef. is rotating and while the -spindle and 'grinding wheel are moving in a circular 7 path, and whereby the ,grinding wheel and spindle may other as desired. And a further Objectis to provide means wherebyl the 'engagement of the driving worm with the worm gear may be adjusted 40 to take up wear.

The invention consists in the details of construction and in thecombination and ar'- rangement of the several parts of my imroved grinding machine whereby certain l important advantages are attained and the Afdevice rendered simpler, less expensive and votherwise more convenient ,and advantai cous for use, as will be hereinafter more ll 'setfo1"t-h.. j l The novel features o f my invention will hereinafter'- be definitely claimed. i

In order thatmy invention .may be the be fed in one'directionor the larly to'Figure 1,

better understood, I will now proceed to describe the same with reference tothe accompanying drawings, wherein:

Figure 1 is a side elevation of an internall grinding machine constructed in accordance t with my invention Figure 2 is a rear end elevation of `the machine;

` Figure 3 is a lfragmentary vertical Sectional' view -through the housing 10 and a portion of `the base B taken on the line Figure 4 is a detail rear elevetion of the.

70 is a fragmentary longitudinal i through the forward end of the spindle and the grinding wheel mounted thereon Figure 7 is a section on the lineJ7-7 'of Figure 3 but showing the spindle in vits lowermost position;

Figure 8V is a sectional view on the, line 8-8 of Figure .7; Figure 9' is a top plan view ofthe construction shown in Figure 7 Figure 10 is a sectional View on the lirie -10-10 of Figure 9; and

- Fi ure 11 is a fragmentary elevation look-- V ing om the rear of the feeding mechanism illustrated in Figure 7.

Referring to the drawings, and

it will be seen t mechanism as a whole includes the base A, a supporting column B wherein the spindle and spindle operating .mechanism is supported, as willbe later described, and a work support C which is mounted for longitudinal movement upon the' powerdriven table 'VD and consists of a plurality of relatively adjustable sections whereby the work may be shifted'longitudinallygof the table', transversely of the table, the' longitudinal axis of the table, and whereby the work may beheld at .any'desii-ed elevation. 'llhis mechanism, which I have designated generally A, B1, forms no. part of my invention, my present inventionlresiding in the means whereby the C and 1),'

jlilarticu-A at my or rotated relative to 'is provided at its ends spindle carryingthe grinding head is rotated and given a bodily movement around a central axis. r 4 l Referring to Figure 3, it will be seen that the column B has rotatively mounted therein an approximately cylindrical carrier 10 which is provided intermediate its ends with the gear l1. This cylindrical carrier with the inwardly 12 and 13 forming directed, annular fianges bearings for a spindle member 10 may be rotated by any suitable mechanism, but I have illustrated for this purposea shaft 15 carrying a pinion or gear wheel-engaging the gear wheel 11 and driven by a belt or sprocket chain 16, in turn loperating over a belt wheel or sprocket wheel 17 carried upon the shaft 18 driven by al sprocket chain 19 from a sprocket Wheel 20 on a motor shaft 21, the motor being designated 22. I do not wish to be limited, however, to the particular means for driving the member 10. This member is entirely enclosed within the housing, formed by the column B and the cap B thereof.

Disposed within the cylindrical carrier 10,J

as, previously stated, is the spindle housing 14, which is annular in cross section, and this spindle housing 14, as indicated clearly in Figure 4, is eccentrically disposed with relation to the carrier 10 so that as thisk carrier 10 rotates in the direction of the arrow in Figure 4, the spindle housing will be carried bodily around the axis a, and it will be seen from Figure, 3 that this spindle housing 14 has a passage 23 which is eccentric to the periphery of the spindle housing. Extending through this passage 23 is a spindle, designated generally 24, and which, as illustrated, is composed of two sections coupled, as at 49, for unitary rotation. ,This

spindle is considerably longer .than the vspindle housing and projects beyond the spindle housin both at its forward and rear ends. Exten ing from the body of the spindle housing 14'is the front spindle housing 25 l within which the forward portion of the tion of the yspindle spindle is reduced at thisv spindle24 is disposed and in which it is 4rotatably mounted. The forward en d of the spindle 24'is mounted in lexteriorly conical bearings 26 :(see Figure 6), while that porcoincident with the rear end of the forward s indle housing 25 is mounted in bearings 2g which "are likewise conical.

The forward end of the housing 25 is screw-threaded, and engaged therewith is a.

collar 28 having an annular ange 29 extending over the end of the bearing 26, and

' by rotating this collar it isA obviousthat` the wear on the bearing may be taken up. The point, as at 30, and surrounding the reduced portion of this spindle and bearing against the forward flange 29 of collar 28'and extending over 'the housing 14. This forward portion'of this collar 28 is a dust caj 31 which rotates with the spindle 24.

urrounding' the body of the dust cap 31 -is' the grinding wheel 32 which may be an The rear end of the spindle 24 projects v beyond the cylindrical housing 14. vThis housing 14 is cut out at its rear end to receive certain ball bearings, as will be later stated, and mounted upon the spindle 24 are the two connected driving pulleys 38 and 39 which are keyed 0r otherwise connected to the spindle 24 to rotate therewith. The ballbearing for the support of the rear end of the spindle may be of any suitable construction, and, as illustrated in Figure 5, comprises an inner member 40, thel outer anular member 41, and intermediate antifriction elements, such as anti-friction balls. This bearing is held in place by means of a jam nut 42 exteriorly threaded to engage the interior threads, on the recess formed in the rear end of the housing 14, as most clearly illustrated in Figure 5.

The rear end of the housing 14 is exterior- 1y screw-threaded for engagement by' the nuts 4 and 3, whereby the housing is held in proper relation to the rotatable carrier 10, whichy has an annular plate .10'El attached to it by screws and against which t-he nuts 43 bear, the forward end of the housing against the end flange* plate 10a. This in- I Thus, v

sures perfect bea-ring at all times. the housing section 14 is supported for relatively rotary `movement wit-hin the rotatable carrier l0 and the spindle is supported for rotation around. its own axis within the housings 14 and 25.

In order to provide means whereby the rindingwheel may be adjusted toward or icm the axis a around which lthe grinding Wheel rotates to thereby finely adjust the depth of cut, I providemeans whereby the spindle housing 14 and thefront spindle housing 25 may be axially rotated. .To this end, I mount upon thejforwardend .ofthe/ carrier 10 an approximately annular platev ,130

68 (see Figures 3 'and .7) having an eccen- Atrically disposed, circular oplening 69 which iits over the fiange 44 of ousing 14 and which is provided with a marginal Bange 70 tting over an annular rabbet or recess formed in the forward end of the carrier 10. This plate 68 carries at one point on its periphery a bearing .bracket 71 supporting .a shaft 72 which, at -its rear end, carries a ratchet wheel 73, havin .radially pro'ecting teeth. The o posite en of this shaft 2 carries a worm 74. Thisworm mesheswith la worm wheel 75 loosely mounted on a shaft 7 6' carried in bearings 77 on the plate 68. One `face of the worm wheel 75 carries upon it the clutch teeth 78, and coacting with these clutch teeth is a clutch member 79 mounted upon' the shaft 76. A coiled com ression sprin 80 bears against one of the caring lugs 7 land against a 'collar 81 carried b the shaft 76 so that normally the clutc member 79 is urged into engagement with the clutch teeth 7-8 and thus the worm wheel 75 is clutched to theA shaft 76. This shaft between the bearing members 77 carries a worml 82, and at`one extremity carries a knurled hand wheel or knob 83.

The plate 68 is mountedd'upon the carrier 10, andsurrounding the extremity of the spindle-housing 14 is al worm gear wheel 84.-

This worm gear wheel 84 has its central opening lconcentric to the axis of the worm gear. Thisworm gear wheel is attached to.A

the housing member 14by screws' 85..4 Worm 82 is keyed to shaft 76 by key 82a.

Mounted upon the housing section B and, therefore, held stationary relative to the rotationvof plate 68 andbracket 71 is anupwardly projecting bracket 86 having two passages for the' two longitudinally shiftable pins 87 and 88'(see Figures 9 and 10). The walls of ther pin passages in the bracket86 are slotted, as at 89, and ears 90 project from the pins 87 and 88 and extend into said slots. The rear ends of the pins 87 and 88 are headed, as at',91, and springs 92 lurge these pinsI rearward, that is, retract the pins.

Mounted upon these pins are the triangular cams 108 and 109. The cam 108 has its angular face, that is, the hypotenuse' of the triangle, facing downwardly and toward the left in Figure 7. The other cam 109 has its inclined face or hypotenuse facing upwardly and* extending `dowarwvard and toward lthe left in Figure 7. Eithercf these cams is adapted to be manually rojected into active posltion by pressingon t e a propriatelmob f 91, but is normally retracte by the spring 92 and held thereby out of active position.

Mounted upon the shaft 72 rearward of the ratchet wheel 7 3 is a awl carrying 'lever 1-10. This leveris rocka le with. relation to the shaft 72 andis held in place by the journal screw 111. The ratchet wheel 73 is', of course, fast on shaft 72. This' lever projects form t el relatively long arm f the lever,

4andl the outer end of this arm is provided with a rearwardly projecting pin 112 carrying a roller 113, as shown best in Figure 11, which roller is adapted, as the plate 68 is rotated, to engage with whichever cam v108 or 109 is projected. I

This lever .110 carries upon it the substanf tially triangular pawl A114, which is trian ar in form'to provide the oppositely projecting teeth 115 and 116 engageable with the ratchet wheel 73. The apex of the trian pin 11'? urged toward 'the paw by a spring 118, as shown in Figure 9. The extremity of this pin 117 is rounded and bears against the rounded apex of the pawl and ieldingly 'holds thepa'wl in one or theother]l of its active positions. The opposite end-face of the lever 110V is formed ,wlth a V-notch 119, and di osed on a bracket or lug' jecting rom the bearing member 1 is a pin 121 urged toward the notch 119 of the lever by means of a spring 122.

Extending from the bracket'71 and ar awl is engaged by a s ring pressed 120 -probracket is a lug or extension 123 having a.

rea a stop. The base of this bracket 71 is alsol formed with an outwardly projecting lug 125 constituting a stop. rihe pawl 114 is adapted to age with one or the otherof. the stops. Thus, for instance,

when the pawl carrying lever 110 moves downward beyond a certain' 116of the pawl114 will stri e the stop 125 and this will shift the pawl 114 so as to bring its tooth 116 in en teeth of the ratchet whe 73 and bring the tooth 115' out of engagement with the teeth vof the ratchet wheel 73. On the other hand, if the tooth 116 is engaged with the ratchet wheel 73, then upon an upward movement of the roller carrymg end of the lever 114 beyond a' certain point,'the toothv 115 will with the plate 68 and with the ma@ bearing. The roller 'strikes and glides upon the 1nclined vface of the cam, and thus oscillates pawl-carrying lever 110 and the pawl'114 will carry the ratchet wheel around 1n one direction, thus giving a partial revolution the worm. 74.l l ThisC being engaged with worm gear 75, revolves the worm'gear,wh1ch rvggardly vprojecting lug .124 constituting referring to Figure 11' agement' with the being carried around line of body rotation in turn revolves the worm 82andthe worm gear wheel 84, thus making an ad ustment of the emery wheel cut by moving t e cally gear wheel 84 which is attached eccent iso to the rear spindle housing, said housing sup porting the front spindle housing 25. After the roller 112 has traveled over the cam, as for instance the cam 1 08, and has moved oill this cam, the lever 110 is brought back to its neutral position by spring plunger 121.

When a reverse adjustment of the feed is required, the operator forces out the other cam, for instance cam 109, and the roller 113 will move over the upper face of this cam, thus shifting the lever in the opposite direction and thus feeding the ratchet wheel in the opposite direction and feeding the spindle oppositely. The lever 110 which has been shiftedV tothe proper position'to cooperate with the cam 108 will., of course, need to be shifted to a reverse position in order to operate the cam 109, and when the operator puts the cam'109 into position to` engage the roller 113, the tooth 115 of pawl 114 will strike the stop 124, thus throwing the pawl into opposite center of the spring plunger 117 and thus cause the tooth 11G to engage the ratchet teeth. Thus, the pawl is kept in one position or the other until the opposite cam is projected... Of course, as soon as pressure is released from the press buttons 91, either cam will be retracted away from the line of rotation of the roller 113 .and the feed will stop.

For rapid adjustment of the wheel, the

. operator presses upon the knob or wheel 83, which -disengages the clutch member 79, thereby releasing all -the automatic feed 'mechanism and then by rotating the wheel or knob 83, a direct and rapid adjustment may be secured in the manner above indicated through the action of the worm 82 on the wormfwheel 84. Upon the release of the knob or wheel 83, the clutch member 79 is/ automatically reengaged with the worm gear wheel 75. x l f ItY is desirable to provide means whereby the engagement between theI worm gear 84 and the worm 82 may be ad'usted to take up wear. To this end, the ront plate 68 is attached to the carrier or main bearing 10 by means of cap screws ,93 passing through slots 94 in theplate 68. Attached to the plate 68 by means of a screw 95 is an eye-bolt or adjusting -serew96, through theeye of which the screw 95 passes, the shank being threaded. This screw-threaded shank 96 passes through a stud 97 which is screwed in the end of the carrier or main bearing 10. The screw 96, ofcourse, passes loosely through the perforation in the lstud 97 and on each side of thisstud are disposed ,the knurled nuts 98 and 99. By releasing the cap screws 93, the front plate 68 can be drawn around circumferentially by turning the knurlednut 99, which action draws the worm 82 into deeper mesh with the worm gear 84. After the desired adjustment has been made, the parts are locked'in,

their adjusted position by the lock nut-98 and the cap screws 93. It will be noted that the pivotal axis of the bearing plate 68 is equi-distant from the axis of rotation of the housing 10 and the axis of rotation of the spindle 24, thus permitting the axis of the spindle 24 to be located incoincidence with the axis of the housing.

The work carriage C may@V be of any suitable design or character and is provided with means whereby it may be longitudinally yshifted toward or from the grinding wheel and the work raised o r lowered, or

the work turned into any desired angle with the axis of the grinding wheel'. Of course,Y `it will be understood that other work supporting means may be used in connection with the movable feed table D, and that the various kinds of work, as for instance, rods, pins, cylinders, pistons, etc. may be ground,

and that where'rods or vpins are to be y ground, the rod or pin or other work will be rotated and carrier 10 will be idle while spindle .24 will rotate around the axis a, and that the same is true of grinding the exterior of a cylinder or piston, but that when interior work is to be ground, the grindin wheel is disposed within the hollowy article and revolves around the central axis a. v

A lever 106v(see Figure 1) is used for shifting the clutch (not shown) which allows for throwing idle the main bearing 10, o1' for causing power to be transmitted to this main bearing 10 or carrier. The throwing of this main bearing 10'idle does not, of course, stop the revolution of the spindle carrying the emery wheel. y The lever 107 is used for changing the speeds of the movable base D. The clutch mechanism controlled by the lever 106 and the means for securing variable s eeds of the table D have not been illustratetl as it is not believed necessary, as these parts are more or less old and well known.

TheA general operation of this mechanism will be obvious from whatvhas gone before. The article to be ground or operated on is supportedon the movable work support and adjusted to the proper position, and the carrier or main bearing 10 is then rotated 'through the gear 11 and at the sameitime the spindle is rotated through the pulleys 38 or 39. By the meansvheretofo're described, the spindle andl grinding-wheel may be bodily shifted radially outward or inward,

vised provides for an extremely fine adjuStment of the feed capable of feeding the cut in fractions of thousandtlis of an inch while the machine is running.

"55 tatable spindle mounted in sai passage and `through said opening,

While I have illustrated a construction which has been found thoroughly'eii'ective for the purpose intended, yet 1t will be obvious that many modiications might be made in the details of construction and arrangement of .parts without departing from the spirit lof the invention.

It will be understood that the outward feed of the grinding wheel is necessary in grinding internal surfaces and that the mechanism for inwardly 'adjusting the grinding -Wheel is especially needed for grinding external cylindrical surfaces.

I claim: Y

1. A .grinding machine including a support, a cylindrical carrier journaled therein and having an eccentric passage extending through it,'a cylindrical bearing vjournaled in said passage, a spindle journaled eccentrically within said bearing and carrying a grinding-wheel, la plate (aixed to one end of said carrier, said alixing means embodying two arcuate slots 1n the plate and also an opening, clamping bolts extending through said slots and anchored in the carrier, a lug aiiixed to the carrier andv extending screw-bolt-means connecting. said lug to said plate .for the v,purpose of rotatively adjusting the same when the clamp bolts are loosened, means for rotatively adjustin the bearing em'- bodying a worm-gear a ed to the bearing,

and ashaft journaled on said plate andcarrying a worm meshing with said worm- V r the carrier, means bein ear. 1 J g2. A grinding machine including a rotatable4 element 4constituting a carrier lhaving a passage extending therethrough eccentric to the axis of rotation of the carrier, a spindle bearin mounted in said passage for rotationwit dle rotatably mounted in said spindle bearing and carrying a grinding wheel, and means for independently rotating the spindle and the carrier, meansbeing also provided for automatically bodily moving the spindle bearing inwardly or outwardly, this last-named means embracing ytwo reversed manually-set elements and a co-acting re-l versible pawl'and ratchet mechanism.

, 3. A grinding machine including a rotatable carrier having a passage extending therethrough eccentric to the axis of rotation of the carrier, an inde endently rocarrying a` grinding wheel, means for rotating the spindle, and means for rotating also provided for bodil vmovin the spin e inwardly or outward y emb ying twoindependent manuuall -setcam elements anda pawl an rate et mechanism co-acting therewith.

4. A grinding machine including arotatable carrier havinga passage extending therethrough eccentric to the axis of rota- `able carrier and having a passage extending relation thereto, a spin-r d centricv to the axis of the bearin acting cam devices mounted on a stationary f support, and devices whereby either one of these cam devices may be brought into coaction with the reversible pawlfand ratchetl means.

5; A grinding machine including a rotattherethrough eccentric to the axis of rotation of the carrier, a tubular bearing mount ed in said passage for rotation with rela.- tion to .the carrier, va spindle rotatably mounted within the bearing and eccentric thereto, means for rotating the carrier, means for rotating the spindlemanually controlledv means for rotating the bearing within the carrier to thereby control the eccentricity of the spindle relative. to the carrier and including means for rotatin the bearing embodying members mounted upon the bearing for rotation therewith, and a pair of relatively fixedv members adapted to enga-ge with the reversely-ar-y ranged members carried on thebearing.

6. A grinding" machine including a :rotatable carrier, a xed element within which the carrier rotates, said carrier having 'a longitudinally extendin assage eccentric to the axis of rotation o t e carrier, a bear-l Aing rotatably mounted'within the carrier and having a passage' extending therethrougheccentric to the axis of the bearing, 4 a rotatable spindle carried within said bearing, means lfor inde endently rotating the carrier and said spindle, rotatively adjusting the bearin 'to thereby adjust the spindle nearer tol or urther from the axis of rotation of the' carrier. includlng gears, one mounted on the 'bearing and one mounted .on the carrier, and reversible ratchet means`for operating saidgearing.

7. A grinding machine including a rotatable carrier, a xed element within whlch the `carrier rotates, 'said 4'carrier having a longitudinally extendin passage eccentric to the axis of rotation oft e earner, a beari rotatably mounted within the carrier an having a passage extending therethroughtea ro a able spindle carried Within' 4sai means for-inde and said e, m-ffor rotating .the/ bearing -to-steby adjust the' spindleY nwrer and means for bearing, e endentlyfrotatin'g the Icarrier to or further from the axis of rotation of the carrier including ashaft mounted upon and. carried by the carrier and having a Worm, a Worm Wheel mounted upon the bearing and with which said Worm engages, a worm gear wheel lmounted upon the shaft a Worm engaging said worm gear Wheel an mounted upon the carrier, a feed Wheel operatively engaged lv'vith said last named- Worm to rotate it and mounted upon yand rotatable with the carrier, and members mounted upon the fixed elementV and independently projectable into the path of movement of the feed Wheel, one of said members-being disposed on one side of the axis of the feed Wheel and the other member on the opposite side ofthe axis whereby to cause a rotationof the feed Wheel through a predetermined angular distance upon the engagment of the feed Wheel with one or the other of said members, saidv members l rier and said spindle, means for rotating the bearing to thereby adjust the spindle nearer to or further from the axis of rotation of the carrier, a shaft mounted upon the end fact of the carrier and carrying a' Worm, a Worm gear Wheel mounted` upon,

theadjacent end face of the bearing and carrying a Worm gear wheel with Which the Worm engages, a Worm gear wheel loosely mounted upon said shaft, a clutch operative tov engage or disengage the worm Wheel with the shaft, a shaft mounted upon the carirer at right" angles-to the first named shaft and carrying a Worm engaging said last named worm gear wheel, a feed Wheel mounted upon said last named shaft, and a pair of spring retracted i cams mounted upon the fixed element and each independently shiftable into the path of movement of the feed wheel, one of said cams being disposed on `one side of the path of movement of the axis of the feed wheel and the otheron the opposite side thereof wherebythe feed Wheel may be rotated in one direction or the`other one step upon each complete rotation of the carrier. l

9. A grinding mechanism including a rotatable carrier, a fixed element in which the rotatable ycarrier 'is mounted, said car` rier having a passage extending therethrough eccentric to the axis of rotation of the carrier, a bearin mounted within said passage for rotation t erein,a spindle rotatably mounted Within the bearing eccentrically to the axis thereof and carrying a grinding Wheel, a Worm shaft mountedupon one end of the carrier and extending tangentially to the bearing, a Worm gear carried by the bearing and engaged by the worml on said shaft, and means for taking up wear between the Worm and said Worm gear Wheel embodying devices for bodily rotatively adj usting theiworm With respect to said carrier.

l0. A grinding mechanism including .a

the axisoofthe carrier, a Worm shaft mounted upon said plate and carrying a Worm, a

Worm gear Wheel mounted upon the adjacent extremity of the bearingand with which said Worm engages, means for shifting said plate rotatively With relation to the carrier comprising a pin mounted on the plate, an eye-bolt engaged With said pin and having a screw-threaded shank, a lug on the carrier through which the screw-threaded shank passes, and adjusting nuts engaging the shank and said lug. n A y l1. A grinding mechanism including a rotatable carrier, a fixed elementin which the rotatable carrier is mounted, said carrier having a passage 4extending therethrough eccentric to the axis of rotation of the carrier, a bearing mounted Within said passage for rotation therein, a spindle rotatably mounted Within the bearing eccentrically to the axis thereof and carrying a grinding, Wheel, a Worm shaft mounted upon one endl of the carrier for longitudinal movement, a

`Worm thereon, a Worm gear Wheel mounted upon the bearing with Whichsaid worm engages, a Worm gear Wheelaloosely mounted upon the shaft, a clutch member mounted upon the shaft and engageable with the last named gear Wheel, a spring urging the shaft in a direction to engage the clutch with the worm gear Wheel, means on the shaft for manually rotating it or longitudinally shifting it toy disengage the clutch from the worm gear Wheel, a shaft mounted upon the' carrier and extending at an angle to the first named' shaft and carrying a worm engaging with the last named worm gear Wheel, and means for causing a fractional rotation of the last named shaft upon each complete rotation of the carrier.

12. A grindin machine including a rotatable carrier, a xed element within which the carrier rotates, said carrier having a longitudinally extending passage eccentric to the axis of rotation ofthe carrier, a bearing rotatably mounted Withinthe carrier and having a passage extending therethrough eccentric to the axis of the bearing, a rotatable spindle carried within said bearing, means for independently rotating the carrier and said spindle, means for rotating the bearing to thereby- 'adjust the spindle nearer to or further from the axis of rotation of the carrier including a shaft mounted upon the end face of the carrier and carrying a worm, a worm gear wheel mounted upon the adjacent end face of the bearing with which said Wormengages, a Welrm gear Wheel loosely mounted upon the shaft, a clutch operative to engage or disengage the last named Worm gear Wheel With or from said shaft, a shaft mounted upon the carrier at right angles to the firstl named shaft and carrying a worm engaglng said last 'named worm -gear Wheel, a ratchet Wheel mounted upon the last named shaft, a lever having' a double pawl engageable with the ratchetpwheel, said lever carrying a roller,

' spring actuated means holding the lever in a neutral position with relation to the ratchet Wheel, a pair of spring retracted .members mounted on the fixed element and4 said lever, one of said cams being disposedV on one side of the path of movement of the roller and the other onthe opposite side thereof whereby the ratchet Wheel may be rotated in one direction orthe other one step upon each complete rotation of the carrier.

13. A'grinding machine including a rotatable earrier, a fixed element Within Which the carrier rotates, said carrier having a longitudinally extending passage eccentric to the axis of rotatlon of the carrier, a bearing rotatably mounted Within the carrier tion of the carrier including a shaft l mounted upon the end face of the carrier and carrying a Worm, a Worm gear Wheel mounted upon the adjacentend face of the bearing With Which said Worm engages, a

.worm gear Wheel loosely mounted upon the shaft, a clutch operative to engage or disengage the last named Worm gear Wheel with or from. said shaft', a shaft mounted upon the .carrier at right angles to the first named shaft and carrying a worm engaging,

i el, a ratchet 'Wheel mounted on -the shaft, a lever loosely said last named Worm gear Whe mounted upon the shaft of the ratchet wheel and carrying a roller at one end, the opposite end of the lever being reentrantly angled, a spring actuated pin bearing against the apex of said reentrant angle and resisting oscillation of the lever, a pawl mounted upon the lever and triangular in form to provide two teeth, either of which is engageable4 with the ratchet wheel, re-

silient means yieldingly holdinggone ,or the -v other of said teeth in engagement with the ratchet Wheel, fixed stops mounted above and below the pawl and with which the pawl is engageable to shift the pawl to carry one or the` other of its teeth into engagement With the ratchet Wheel, and cams independently movable into the, path of said roller, said cams having oppositely inclined faces and acting lto shift the roller in one direc tionvor the'other upon each rotation of the carrier to thereby cause the ratchet Wheel to be shifted one step in one direction or the other upon each rotation of the carrier..

` HARRY F.` JOSEPH.

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