USRE16043E - joseph - Google Patents

Description

April 14, 1925. Re. 16,043

H. F. JOSEPH INTERNAL GRINDING MACHINE Original Filed Aug, 7, 1920 5 Sheets-Sheet 1 BY ,gwmw

ATTORNEYS April 14, 1925.

H. F. JOSEPH INTERNAL GRINDING MACHINE Original Filed Aug. '7. 1920 5 Sheets-Sheet 2 ATTORNEYS Ap 14-, 1925. v H. F. JOSEPH 1 INTERNAL GRINDING MACHINE Original Filed Aug. 7, 1920 5 Sheets-Sheet 4 INVENT R ATTORNEYS April 14, 1925. H. F. JOSEPH INTERNAL GRINDING MACHINE Original Filed Aug. 7, 1920 5 Sheets-Sheet 5 n% m g Q INVENTOR I 2452 BY A ATTORNEYS a but also to wash away the detritus.

Reissued Apr. 14, 1925.

sTATE 1 PATIENT I OFFICE.

HARRY r. :rosnrn, or nAvnNro-nr, IOWA, AssfGNoR, 'BY MEsltE Ass remvmn'r's, 'ro MICRO MACHINE-COMPANY, or ZBETTENDORF, owa, a oonrona'rron or IOWA.

INTERNAL-GRINDING MACHINE.

, I Original No. 1,396,123, dated November 8, 1921 ,'Seria1 No. 401,088, filed'August 7, 1920. Application for 1 reissue filed September 7, 1923. Serial No. 661,534.

To all whom it may concern:

Be it known that I, HARRY citizen of the United States, residin at Davenport, in the county of Scott and State of Iowa,have invented certain new and useful Improvements in Internal-Grinding Macl1ines,.of which the following is a specification, reference being had to the accompanying drawings.

This invention has relation to that type of grinding machines in which the grinding-wheel spindle is not only rotated axially but is given an orbital movement to cause the grinding-wheel while rapidly rotating to follow the contour of a cylindrical surface. During the operation of the machine, the spindle and the wheel are in addition given a feeding motion, i. e., a step-by-step movement either radially inward or radially outward, according to whether the wheel is operating upon an external surface or an internal surface. I haveshown and described mechanism for imparting this feeding action to the spindle and the grinding-wheel, but this mechanism is covered by my copending divisional application, Serial No. 506,300.

The present invention has relation to means for maintaining a continuous supply I of water to the oint of attrition, to thereby not only keep t e wheel and the work cool It has been known for sometime that this wet grinding is advantageous, but no one has ever succeeded in practically applying it to.

the type of grinder hereinbefore described. It is the object of the present invention to provide a simple and efiicient means for maintaining a continuous stream of water at the grinding-point of su'fiicient force and as to always maintain the volume to keep the wheel and the work cool and at the same time wash away'the grit, so

- clean, whereby I am enab ed not only to perform the grinding operation economically but also to obtaln avery high degree of smoothness and recision in the work, as more fully hereina er set forth.

Other objects will-appear in the course of the following description.

- My invention is illustrated in the accompanying drawings, wherein Figure 1 is a side elevation of an internal F. JosnPH, a

inding-surface grinding machine constructed in accordance with my invention;

chine;

Fig. 3 is a fragmentary vertical sectional View through the housing 10 and a portion of the base B taken on the line 33 of Fig. 4; a i

Fig. 4 is a detail rear elevation of the housing and bearings for the spindle;

Fig. 5 is a fragmentary vertical sectional view through the rear end of the spindle and the bearings therefor showing the water ducts in section;

Fig. 6 is a fragmentary longitudinal sectional view through the forward end of the spindle and the grinding wheel mounted thereon Fig. Fig. 6;

' Fig. 8 is a section on the line 88 of Fig. 3 but showing the spindle in its lowermost position;

Fig. 9 is a sectional view on the line 99 of Fig. 8;

Fig. 10 is a top plan view of the construction shown in Fig. 8;

Fig. 11 is a sectional View on the line l111 of Fig. 10;

Fig. 11 is a fragmentary elevation, look: ing rom the rear of the feeding mecha nism illustrated inFig. 8;

Fig. 12 is a detail elevation partly in section of the joint between the spindle members 24 and 37;

Fig. 13 is a section on the line 1313 of Fig. 12;

Fig. 14 is an elevation of the guard 102 in applied position, the spindle housing being broken away;

Fig. 2 is a rear end elevation of the ma- 7 is a section on the line 7- 7 of Fig. 15 is a detail side elevation of the 1 shifted longitudinally of the table, transversely of the table, or rotated relative to which is provided intermediate its ends with the gear 11. This cylindrical carrier is provided at its ends with the inwardly directed,

annular flanges 12 and 13 forming bearings for a spindle housing 14. This member may be rotated by any suitable mechansm,

but I have illustrated for this purpose a shaft 15 carryinga pinion or gear wheel engaging the gear wheelll and driven by a belt or sprocket. chain'16, in turn operating over a belt wheel or sprocket wheel 17 carried upon the shaft 18 driven by a 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 inclosed within the housing formed by the column B and the cap) B thereof.

isposed within the cylindrical carrier 10, as previously stated, is; the spindle housing 14, which is annular inflcross section, and this spindle housing 14, as indicated clearly in Fig. 4, is eccentrically-disposed with relation to the carrier 10 so that as this carrier 10 rotates in the "direction of thearrow in Fig. 4, the spindle housing will be carried bodily around the axis a, and it will be seen from Fig. 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, desig nated generally 24, and'which, as illustrated,

is composed of the two sections. This spindle is considerably longer than the spindle housing and projects beyond the spindle housing both'at its forward and rear ends. Extending from the body-14 of the spindle housing is the front spindle housing 25 within which the forward portion of the spindle 24 is disposed and in which it is. rotatably mounted. 24 is mounted in exteriorly conical bearings 26', (see Fig. 6) while that. portion of the spindle coincident with the rear end of the forward spindle housing 25 ismounted in bearings 27 which are likewise conical.

The forward end of the housing 25 is screw-threaded, and engaged ther with is a ccliar 28 having an annular flange 29 ex- The forward end of the spindle tending over the end of the bearing 26 and by rotating this collar it is obvious that the wear on the hearing may be taken up. The

spindle is reduced at this 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 forward portion ofthis collar 28 is .a dust cap 31 which rotates with the spindle 24. Surrounding the body of the dust cap .31 is the grinding Wheel 32 which may be The extremity of the spindle 24 is screw-- threaded, and engagingthis screw-threaded portion is a nut 34 having radially extend-, ing, relatively shallow passages 35, (see Fig. 7)- and riveted to this nut is a plate 36. The s indle has a longitudinally extending bore 3 by which water is supplied to the grinding wheel, and this bore' flares toward its forward end and "discharges water into the radial ducts 35 and by these radial ducts the water is discharged against wheel 32 and. carried outward by centrifugal action against the work. i

The rear end of the spindle 24 projects beyond the cylindrical housing 14. This 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 or otherwise connected to the spindle 24 to rotate therewith. i The ball bearing for the support ofthe rear end of the spindle may be of any suitable construction, and as illustrated in Fig. '5 comprises an inner member 40, the outer annular mem ber 41, and the intermediate anti-friction element, such' as anti-friction balls. This ball bearing is held in place by means of a jam nut 42 exteriorly threaded to engage the inte rior threads on the recess formed in the rear end of the housing 14, as most clearly illustrated in Fig. 5. The rearendof the housing 14 is exteriorlyj screw-threaded for engagement by the nuts 43, whereby the housing is held in proper relation to the rotatable carrier 10, which has an annular. plate 10 attached to'it by screws and against which the nuts 43 bear, the forward end of the housing section 14 having a flange 44 which bears against the split ring 43*. The

nuts 43 pull the spindle housing 14 against' the split ring 43 on the'forward end of the spindle housing and push the rear split ring 43 against end flange .plate 10. This insures perfect hearing at all times. Thus,

the housing section 14 is supported for "relatively" rotary movement within the rotatable carrier 10 and the spindle is supported for rotation around its own axis within the housings 14 and 25. Preferably this spindle is .formed in two sections, as shown."

with a' central, conical boss'4'7 seating yvithin the end of the other section, and these" two parts-being held from relative rotation by pins '48. The two sections are held together by a flexible couplingmember 49 hav ing a flange-to engage over the head 46 and being interiorly screw-threaded to. engage over the screw-threads 45. This coupling member is held in placeby a jam nut 50.

It will be noted from Fig. 12 that the exterior face of the boss 47 is sli htly curved or struck on a radius andthatt ierea-r face of the shoulder 46 also has a curve corresponding to the radius of the curvature on the outer face of the boss 47 to thereby allow for flexibility in the coupling at this point, the pins 48 being relatively loose-in the sockets formed in the part'24 to permit this.

At its rear end, the spindle carries means whereby it may be connected to a water sup-' ply pipe and to a pipe forcarrying off excess water, and to this end, as illustrated in Fig; 5, the bore 37 at the-rear end of the spindle is flared, as at. 51, and this rear end of the spindle is exteriorily screw-threaded. Surrounding the rear end of the spindle is'a hollow head 52 which is interiorly screwthreaded at its rear end, and disposed within this screw-threaded ortion of the head is a housing nut 53 which is annular and carries a conical nozzle 54. This conical or tapered end is disposed within theflared rear end 51 of the bore 37, this nozzle being provided with ashoulder disposed between the nut 53 and the rear end of the spindle. Surrounding and rotating with the spindle 24 are the internal bearing members 55 and 56 separated by an internal spacing collar 57.

'Balls or other anti-friction elements 58 surrouncb the bearing members 55 and 56 and roll against the outer bearin members 59 and 60 which fit within the outer bearing members 59 and 60. The bearing members 55 and 56'with the collar 57 are forced-against the conical projecting end 39 of'the pulley 39 by means of a nut 62 engaging the screw-threaded rear end of thcspindle 24. The rear extremity of the nozzle 54 projects out beyond the nut 52 and I is exteriorly screw-threaded for engagement .water would be forced into the ball bearings.

and 52. The' central, outer spacing collar 61 separates the The water is preferthe' n1eans. .whereby housingor'head may be carried off, this out,-' p let branch 65-connectingtoa flexible pi e' .67. It will, of course, be obvious. from the above description that the spindle can rotate .freely within the housing 14 and'withinthe head or-housing 52 and with reference-to [the nozzle 54, andthat water may becontinuouslysupplied to the port of the spindle it and that overflow will be carried ofl' from the branch 66. The overflow passes out through the. space between the extremity of the nozzle 54 and the flared end 51 of spindle Should there I be no overflow space" This overflow also allows drainage when. supply of Water is cut off.

In order to:.p rovide means whereby .the

grinding wheel may beadjusted toward-or from the axisa around which the grinding wheel rotates to thereby finelyadjust the depth of cut, I provide means whereby the housing-section 14and the housing section 25 with it may be axially rotated. To this end, I mount upon the forward end of the carrier lOjan approximately annular, plate 68 (see Figs. 3 and 8) having an eccentrically disposed. circular opening 69 which fits over the flange .44 of member 14 and which is provided with a marginal flange 70 fitting'over an, annular rabbet or recess formed in the forward endofthe 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, having radially projecting teeth. The opposite end of this shaft 72 carries a worm 74. This worm meshes with a worm wheel 75 loosely mounted on a shaft 76'carried in bearings 77' on the plate 68. One face of the worm wheel 7 5 carries upon it the clutch teeth 78, and coacting with these clutch teeth is a clutch member 7 9 mounted upon the shaft 76. A coiled com.- pression sprin 80 bears against one of the bearing lugs 7 and against-a collar 81 car-' ried by the shaft 76 so that normally the clutch member 79. is urged into engagement with the clutch teeth 78 and thus the worm wheel 75 is clutched to the shaft .76. This shaft between the bearing members 77-carries a worm 82, and at one extremity carries keyed to shaft 76 by key 82".

Coacting with the ratchet wheel 73, as

will be later described, and mounted upon thehousing section B and, therefore, held stationary relative to the rotation of plate i the relatively long arm of the'lever, and the- 68 and bracket 71 is an upwardly projecting bracket 86 having two passages for the two longitudinally shiftable pins 87 and' 88 (see Figs. 10 and 11); T] e walls of the pin pasface extending downward and toward the left in Fig. 8. Either of these cams is adapted to be manually projected into active position by pressing on the appropriate knob 91, but is normally retracted by the spring 92 and held thereby out of active position.

Mounted upon the shaft 72 rearward of the ratchet wheel 73 is a pawl carrying lever 110. This. lever is'rotatable with relation to the shaft 72 and isheld in place by the screw 111. The ratchet wheel 7 3 is, of course, fast on shaft-72. This lever projects laterally from its'a-xis in one direction to form outer end of this arm is provided with a rearwardly projecting pin 112 carrying a roller 113,..as shown best in Fig. 11, which roller is adapted, as the plate 68 is rotated, to engage with whichever cam 108 or 109 is projected. This lever 110 carries upon it the substantially. triangular pawl 114, which is triangular in: form to provide the oppositely projectinglteeth 115 and 116 engageable with the ratchet wheel 73. The apex of the triangular pawl'is engaged by a spring pressed pin 117, urged toward the pawl by a spring 118, as shown in Fig. 10. The extremity of this pin 117 is rounded and bears a ainst-the rounded apex of the pawl and yleldingly holds the pawl in one or the other of its active ositions. The opposite extremity of the ever 110 is formed with a re-' entrantly'angled face 119, and disposed on a bracket or lug 120 projecting from the bearing member 71 is a spring projected pin 121 projected toward the angular face 119' of: the lever by means of a spring 122. Ex-

tending from the bracket 71 and specifically from the bearing portion of this bracket is a lug or extension 123 having a forwardly projecting lug 124 constituting a stop. The base of this bracket 71 is also formed with a forwardly projecting lug 125-constituting a stop. The pawl 114: is adapted to engage "with one or the other of these steps. Thus, for instance, referring to Fig. 11, when the pawl carrying lever 110 moves downward beyond a certain point, the tooth 116 of the pawl 114 will strike the stop 125 and this will shiftthe pawl 114 so as to bring its tooth 116 in engagement with the teeth of the ratchet wheel 73 and bring the tooth 1.15 out of engagement with the teeth of the r'atchetwheel 73. On theother hand, if the tooth 116 is engaged with the ratchet wheel 73then upon 'an upward movement of the roller carrying end of the lever 114 beyond a certain point,.fthe tooth 115 will strike the stop 124'and the osition of the pawl will be reversed. It wil be seen that when the operator presses upon one or the other of the pins 87 or 88,the corresponding cam 108 or 109 will be projected into the line of rotation of roller 113, this roller being carried around with the plate'G'S and with the main hearing. The roller strikes and glides upon the correspondingeam, and when it is struck the in one direction, thus giving a partial revo- -lut1on to the ratchet wheel 73 andgiving apartial rotation to the worm 74. This being engagedwith worm gear 75, revolves the wormgear, which in turn revolves the worm 82 and the worm gear wheel 84, thus making an adjustment of the, emery wheel cut by moving the worm gear wheel 8-1 which is attached eccentrica-lly to the rear spindle housing, said housing supporting the front spindle housing 25. After the roller 112 has traveled over the cam, as for instance the cam 108, and has moved off this cam, the lever 110 is brought'back to its neutral position by-spring' plunger 121. Vhen a reverse adjustmentof the feed is required, the operator forces out earn 109, for instance 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 pin which has been shifted to the proper position to operate the cam 108 will, of course, need to be shifted to a reverse position in order to 0p 'erate the cam 109. and when the operator carries the cam ,109 into position to engage the roller,the tooth 115 of pawl 11.4 will strike the stop 124, thus throwing the pawl .into opposite center of the spring plunger 117 and causing the tooth 116 to engage the ratchet teeth. If the pawl strikes the ram 108, a reverse action takes place and the depression of the lever will cause the pawl to strike the stop 125 and the pawl will again be reversed; Thus the pawl is kept in one position or the other until the opposite cam llh ' up wear. To this end, the front plate 68 is attached to the carrier or main bearing 10 by means of cap screws 93 passing throu h slots 9% in the plate 68. Attached to t e plate 68 by means of a screw 95 is an eyebolt or adjusting screw 96, through the eye of which the screw 95 passes, the shank being threaded. This screw-threaded shank 96 passes through a stud 97 which is screwed v in the end of the carrier or main bearing10.

. justed position by thelock nut 98' and the- The screw 96, of course, passes loosely through the perforation in the stud 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 knurled nut 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 adcap screws 93.

It will be noted that the pivotal axis of the bearing plate 68' is e ui-distant from the axis of rotation of the axis of rotation of the spindle 24, thus permitting theaxis of the spindle 21 to be located in coincidence with the axis of the housing.

It will be seen from Figs. 1 and 2 that the flexible pipes 64 and 67 extend downward through slot 100 which is formed in a yoke 101 which is rotatably mounted in and projects from the housing wall formed by the, supporting column B. This yoke 101 is a freely oscillatable yoke and thus takes care of the independent eccentric action of the head or elbow 52 and permits the free movement of the pipes 64 and 67 rendered necessary by this eccentric action ,of the various parts.

The workcarriage. C may be of any suit able design or character and is provided with means whereb it may be longitudinally shifted towar or from the grlnding wheel and the work raised or lowered, or the work turned into any desired angle with the axis of the grinding Wheel. Of course, it will be understood that other work supporting means may be used in connection with the movable feed table,D, and for various kinds of Work, as for instance, rods,

spindle housin ousing 10 and the pins, cylinder s,pistons, etc., and that where rods or pinsare tobe ground, the rod or p n or other work will be rotated and car'- r1er 10 will be'idlev while spin(lle '2& will rotate around the axis d, and that the same is true of grinding the exterior of a "cylinder or piston, but that .Wheninterior work is to be ground, the grindingwheel is dis posed within the hollow article and revolves,

around the central. axis (1. Where external grinding is being done, a guard, such as Shown in Fig. 14, will be used; This guard 102 is approximately semi-circular in form and embraces the grinding wheel and is pro vided with a shank portion 103 having clamps whereby it may be engagedwith the This guard is preferably in two halves hinged together and is clamped.

upon the main spindle housing 25 in any desired position. Water will strike the guard and be thrown off upon the "revolvir 1 work. The pump which supplies water 50 the spindle is controlled by a knob 104 which, when shifted inward, throws the ptunp out of gear when the water supply is not desired, and which, when pulled outward, throws the pump into gear. A lever 106 (see Fi 1) is used for shifting the clutch (not s own) which allows for throwing idle the main bearin 10,-that is 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 emery wheel. The lever 107 is used for changing the speeds ofthe movable f base I). he

clutch mechanismcontrolled by the lever Y 106 and *the means for' securin variable speeds of the table D havernot trated, as it' is not believed fn'eces'sa'ry,as

glass-parts are more or lessold well i Ifhavenot shown in detail the means for operating-the work support to thereby feed the work nor have I shown any means for controlling the speed of the various shafts or the rotating I speed of the'spindle, or the speed of revolution of the spindle and its grinding wheel around the central axis a, as these may be'of any desired and' obvious contruction.

The general operation of this mechanism will be obvious from what has gone, before.

The article to be ground or o erated on is supported on the movable wor support and adjusted to the proper position, and the carrier or main bearing 10. is then rotated through the gear 11 and at the same time the spindle is rotated through the pulleys 38 or 39. When grinding internally,'t he spindle will be rotated, rotating with it the grinding wheel and at the same time the grinding wheel and spindle will move bodily around the axis a. By the'meansheretofore described, the spindle and rinding centrifu a1 force against the face of the may be shifted radially outward or inward, as desired, either automatically by forcing in one or the other of the pins 87 or 88, or by disconnecting the clutch 7 9 the feed may be rapidly controlled by means of the wheel 83. The feeding means which I have de-' vised provides for an extremely fine adjustment of the feed capable of feeding the cut in fractions of thousandths of an inch while the machine is runnin The particular construction of the grin ing wheel and the means for su'pplging water thereto provides cool. Obviously other liquids than water mi ht be used if desired.

" hile I have illustrated a constructionwhich has been found thoroughly efiectivo for the purpose intended, yet It will be obvious that many modifications might be made in the details. of construction and ar-.

rangement of arts without departing from the spirit of t e invention.

I claim:'- r 1. In. a mechanism of the character described, a tubular spindle a grinding wheel mounted thereon and having a rec ess in one end face, anut engaging the'spindle and bearing against th grinding wheel and dis- .osed in said recessed end face, the outer ace of said nut havin radially extendin grooves, and a baflle p ate attached to said nut and extending over said recesses therein.

2. In a mechanism of the character described; a tubular spindle'reduced at one end having an exterior screw-threaded ex-. tremity, the bore of the spindle flaring toward its extremit, a grinding wheel surrounding the' re uced extremity of the spindle and, having a recess in its outer end face, and a nut engaging the screwth-readedextremit of the spindle and disposed within said recess, said nuthaving radial discharge ducts communicating with the bore of the spindle, and a baflle late attached to the face of said .nut and mming the outer wall of the said ducts.

3. In a mechanism of the character described, a tubular, rotatablejspindle, a hollow head into which the end of the spindle extends, bearings mounted in said hollow head supporting the spindle, a nozzle carried in the hollow head and projecting loosely into the bore ofthe spindle, and a supply pipe connected to the nozzle.

4. Inia mechanism of the character describedfga tubular, rotatable spindle, a hollow head into which the end ofthe spindle extends, bearings mounted in said hollow head supporting the spindle, a nozzle car ried in the hollow head and. rojecting loosely into the bore of the spin e, a supply pipe connected to the nozzle, and a discharge pipe connected to the head, the 'head having ducts communicating withv the interior of the spindle to carry-oil the excess liquid.

5. In a. mechanism of the character described, a tubular rotatable spindle, bear.

ings supporting the spindle, a fixed hollow head into which the rear end of the spindle projects and open at its opposite ends, antifriction bearing elements dis sed within the hollow head and supporting the rear 'end of the spindle, a plug detachably closing the rear end of the head, a nozzle carried bysaid plug and discharging into-the bore of the spindle, and a tubular water connection. operatively enga ed with the nozzle.

6. In a mechanism 0 the charatcer described, a tubular rotatable spindle, bear ings in which the spindle is mounted, a hollow head into which the rear extremity of the spindle projects and having an inturned flange at its forward end, an outer ball race disposed against said flange within the head, an inner ball race mounted on the spindle, anti-friction elements. disposed be tween the races, inner and outer spacing sleeves abutted a 'ainsttheraces, an inner and outer race disposed against the rear ends of the, spacing. sleeves, anti-friction members disposed between said races, a nut on aging the rear extremity of the spindle an bearing against the inner rearmost race,- a plu having screw-threaded engagement with t e rear end of the head and having a central aperture, the lug being hollowed out 'to form a circum erentially extending chamber surrounding said nut and having a; discharge duct leadlng from said chamber,

a nozzle rotatably mounted in the openin" of. the lug and confronting the rear en of the spindle and discharging thereinto,

, the nozzl and rear end of the spindle being need from each other to permit the diss c arge of water through said ace .into said chamber and duct, and a. ho] ow water supply member engaged with the rear end of said spindle. j

7. A .mechanism of the character described including a tubular spindle, a grinding wheel mounted thereon for rotation" therewith, means for movin the spindlev bodily through a circular pat eccentric to the axis of the s indle, means at the rearend of the spind e for forcing water into and through the tubular s indle, and means at the rear ehd of the spindle for carrying oil excess water. 8. A mechanism of the character described including a tubular spindle, a grinding wheel mounted thereon for rotation therewith, means for moving the spindle off excess water,"said means including flexible pipes and a' swivelly mounted yoke through which the pipes pass.

9. In a machine for grinding lnternal 1 cylindrical recesses, a rotatable drum and means for driving it, aspindle journaled in said drum eccentric to the axis thereof whereby the rotation of the drumwill impart a bodily rotation to the spindle, means for axially rotating said spindle at a relatively high speed while bodily rotating, a grinding-wheel carried .by said slpindle, means for continuously forcing liqui along said spindle and delivering it at the grinding-wheel-end thereof, and means for delivering the liquid by centrifugal force at a relatively great velocity against the cylin- (irical i ace of the work.

10. In a mechanism of the character described, a rotatable drum and means for driving it, a tubular spindle journaled eccentrically in said drum so as to rotate bodily therewith, means for giving said spindle an independent axial rotation at a relatively high speed while bodily rotating, a grinding whcel on said spindle, means for continuously forcing li uid through said spindle, an outlet for the liquid being provided at the grindiug-wheel-end of the spindle, and means for deflecting the liquid against one face of said grinding-wheel, whereby said liquid is projected outwardly therefrom by centrifugal force at a relatively great velocity against the internal'face of the work.

11. In a mechanism of the character described, a rotatable drum and means for driving it a tubular spindle journaled eccentric-ally in said drum so as to rotate bodily iherewith, means for giving said spindle an independent axial rotation at a relatively high speed while bodily rotating, a grinding-wheel on said spindle, means for con tinuously forcing liquid through saids indle, an outlet for the liquid being provide at the grinding-wheel-end ofthe spindle, and means for deflecting the liquid against one face of said grinding-wheel, whereby said liquid is projected outwardly therefrom by centrifugal force at a relatively great velocity against the internal face of the work, said deflecting means being located in arecess in one face of the grinding-wheel.

12. In 'a machine for grinding internal cylindrical recesses, a tubular spindle mounted for rotation on its own axis and for bodily rotation on an axis eccentric thereto, a grinding wheel carried by said spindle and having a recess in one end face surrounded by an imperforat'e annular wall, means in said recess having radlal passages to conduct streams of liquid against said annular wall whereby the liquid will flow over the face of said wheel and be projected a ainst the wall of the cylindrical recess, sai passages having their inner ends in communication with the interior of the tubular spindle, and means for supplying liquid to the interior of the spindle.

13. In a mechanism of the character described, a rotatable drum and means for rotating it, a tubular spindle eccentrieally journaled in said drum so as to bodily rotate therewith, means for giving said spindle an independent axial rotation at relatively high speed while bodily -rotating, a grindingwheelon said spindle, and means for continuously delivering liquid to the inlet-end of said tubular spindle during its bodily rotation and axial rotation, said means for continuously delivering the liquid embodying a nozzle having te escopic relation with the inlet-end of the tubular spindleand a housing 'or head enclosing the nozzle and mounted for bodily movement with the spindle.

14. In a mechanism of the character described, ,a rotatable drum and means for rotating it, a tubular spindle eccentrically journaled in said drum so as to bodily rotate therewith, means for giving said spindle anindependent axial rotation at relatively high speed while bodily rotating, a grinding-

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