US1396123A

US1396123A - Internal-grinding machine

Info

Publication number: US1396123A
Application number: US401988A
Authority: US
Inventors: Harry F Joseph
Original assignee: B L SCHMIDT Co
Current assignee: B L SCHMIDT Co
Priority date: 1920-08-07
Filing date: 1920-08-07
Publication date: 1921-11-08
Anticipated expiration: 1938-11-08

Description

H. F. JOSEPH. INTERNAL GRINDING MACHINE. APPLICATION FILED AIUGJ, Z920- Patented Nov. 8, 1921.

5 SHEETS SHEET I.

H. F. JOSEPH.

INTERNAL GRINDING MACHINE.

APPLICATION FILED AUGJ, 1920- 5 SHEETS-SHEET 2- Patented Nov. 8, 1921.

H. F. JOSEPH. INTERNAL GRINDING MACHINE.

APPLICATION FILED AUGJ, I920.

5 SHEETS-SHEET 3.

Patented Nov. 8, 1921.

$N Mm MN 7 QQ I Q Q NW1 I NM NM NM. $257 vvn N hm .Qm. F/4251929 714 I." .II IIIIIWVIIMI i vmzrvi 5 Av /44.552912. \h 7.

H. F. JOSEPH. INTERNAL GRINDING MACHINE. APPLICATION FILED AUGJ, I920.

1,396,123. Patented Nov. 8, 1921.

5 SHEETS-SHEET 4. s

H. F. JOSEPH.

INTERNAL GRINDING MACHINEJ APPLICATION FILED AUGJ, 1920.

Patented Nov. 8, 1921.

5 SHEETS-SHEET 5.

UNITED STATES PATIENT OFFICE.

HARRY F. JOSEPH, OF DAVENPORT, IOVA, ASSIG-NOR, BY MESNE ASSIGNMENTS, TO B. .'L. SCHMIDT COMPANY, A CORPORATION OF SOUTH DAKOTA.

IN TERNAL -GRINDING MACHINE.

Application filed August 7 T 0 all whom it may concern Be it known that I, HARRY F. JOSEPH, a citizen of the United States, residing at Davenport, in the county of Scott and State of Iowa, have invented certain new and useful Improvements in Internal-Grinding Machines, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to grinding machines, and particularly to machines for grinding the inner or outerfaces of automobile cylinders,'pistons, pins, valves, and in fact, all parts commonly found on automobiles, though it is obvious the invention not limited to the use for which it is particularly designed, as it might be used for grinding cylinders or other parts for other mechanisms. 7

The general object of the invention is to provide a mechanism of this character ineluding a grinding wheel which is rotatable and at the same time may be moved in a circle around the central longitudinal axis of revolution or may be rotated without moving bodily around the central axis.

Afurther object'in this connection is to provide means whereby the tfeed of 'the grinding wheel may be controlled, this mechanism being such that the grinding wheelmay be fed in either direction while the machine is running.

A further objeot'is to provide 7 means whereby the rapid adjustment of-the grinding wheel may be made by hand when the main bearing supporting the grinding wheel and its parts is idle. A further object is to provide means whereby water maybe supplied to the grinding wheel and whereby this water may be thrown'by the centrifugal action of the wheel outward to the face of the work being acted upon. I

A further object is to provide means whereby the water used which is thrown outward against the work shall keep the grinding wheel spindle cool at all times.

Another object is to provide means which prevents the oil from the bearings of the grinding wheel spindle from getting upon the grinding wheel and prevents dust from the grinding wheel getting into the bearings.

A further object is to provide a guard for use in external grinding to throw the water upon the revolving work.

Specification of Letters Patent.

Patented Nov. 8, 1921.

. 1920. Serial in. 401,988.

A further object is to provide very simple and effective means whereby the grinding wheel may be adjusted while the spindle is rotating and while the spindle and grinding wheel are moving in a circular path, and whereby the grinding wheel and spindle may be fed in one direction or the other as desired.

And a further object is to provide means whereby the engagement of the driving worm with the worm gear may be adjusted to take up wear.

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 grinding machine constructed in accordance with myinvention; I

Fig. 2 is a rear end elevation of the machine; v

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

Fig. tis 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. 7 Fig. 6;

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

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

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

Fig. 11 is a sectional 11-11 of Fig. 10;

Fig. 11 is a fragmentary elevation looking from the rear of the feeding mechanism illustrated in Fig. 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 13-13 of Fig. 12;

Fig. 1a is an elevation of the guard 102 is a section on the line 77 of view on the line an approximately bodily around the axis a, and it in applied position, the spindle housing being broken away; 7

Fig; 15 is a detail side-elevation of the guard with its shank.

Referring to the drawings, and particularly to Fig. 1, it will be seen that my mechanism as a whole includes the base A, a supporting column B wherein the spindle and spindle operating mechanism is supported, as will be later described, and a work support C which is mounted for longitudinal movement upon-the power driven table D and consists of a plurality of relatively ad iustable sections whereby the work may be shifted longitudinally of the table, transversely of the table, or rotated relative to the longitudinal axis of the table, and whereby the work may be held at any de sired elevation. This mechanism, which I have designated. generally A, B, C and D forms no part ofmy invention, my present invention residing in the means whereby the spindle carrying the grinding head is rotated and given a bodily movement around a central axis, and whereby water is sup plied to the grinding wheel.

Referring to Fig. 3, it will be seen that the column B has rotatively mounted therein cylindrical carrier '10 which is provided intermediate its-ends with the gear 11. This cylindrical carrier is provided at its ends withthe inwardly directed, annular flanges 12 and 13 forming bearings for a spindle housing 14. This member 10 may be rotated by any suitable mechanism, but I have illustrated for this purpose a shaft lacarrying a pinion or gear wheel engagingthe gear wheel 11 and driven by a belt or sprocket chain 16, inturn operating over a belt wheel or sprocket wheel 17 car.- ried uponthe shaft 18 driven by a sprocxet chain 1.9 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 Disposed within the cylindrical carrier 10, as previously stated, is the spindle housing 14, whiciiis annularin cross section, and this spindle housing 14, as indicated clearly in Fig. 4, is eccentrically disposed with relation to the earrienlO so that as 10 rotates in the direction of the arrow in Fig. 4, the spindle housing will be carried will be seen from Fig. 3 that this spindle housing 14 has a passage 23 which is eccentric to the leriphery 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 this carrier in which the forward portion of the spindle 24 is disposed and in which it is rotatably mounted. The forward end of the spindle 24 is mounted in exteriorly conical bearings 26, (see Fig. 6) while that portion of the spindle coincident with the forward spindle housing 25 is mounted in bearings 27 which are likewise conical.

The forward end of the housing 25 is screw-threaded, and engaged therewith is a collar 28 having an annular flange 29 extending 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 surroundingthe reduced portion of this spindle and bearing against the forward the forward portion of thiscollar 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 an emery grinding wheel or carborundum grinding wheel, or a grinding wheel of any suitable character, the face-of this grinding wheel being out out at its center, as at 33. The extremity of the'spindle 24is serewthreaded, and engaging this screw-threaded portion is a nut 34 having-radially extending, relatively shallow passages'35, (see Fig. 7 and riveted to this nut is a plate 36. The spindle has a longitudinally extending bore 37 by'which water is supplied to the grinding wheel, and this bore flares forward end and discharges water into the radial ducts 35 and by these radial ducts the water is discharged against wheel 32 rear end of the flange 29- of collar 28 and extending over toward its and'carried outward by centrifugal actio against the work.

. The rear end of the spindle 24 projects beyond the cylindrical housing 14. This housing 14 is cutout 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 nut 42 exteriorly threaded to engage the 1nterior threads on the recess formed in the rear end ofthe housing 14, as most clearly illustrated in Fig. 5. The rear end of the housing 14 is exteriorly screw-threaded for engagement by the nuts 43, whereby the housing'is held in properrelation to the rotatable carrier 10, which has an annular the split ring 43 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 on the forward end of the spindle housing and push the 7 rear split ring 43 against end flange plate 10 This insures perfect bearing at all times. Thus, the housing section 14 is supported for relatively rotary movement within the r0- tatable carrierlO 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 in Fig. 12, one of the sections being so 'ewthreaded, as at 45, the other section having a head 46'of the same diameter as the screwthreaded section, this head being formed with a central, conical boss 47 seating within 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 coupling member 49 having a flange to engage over the head 46 and being interiorly screi'v-threaded to engage over the screw-threads 45. This coupling member is held in place by a nut 50.

It will be noted from Fig. 12 that the exterior face of the boss 47 is slightly curved or struck on a radius and that the rear 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 supply pipe and to a pipe for carrying 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 exteriorly 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 portion 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 the flared rear end 51 of the bore 37,-this nozzle being provided with a shoulder 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 otheranti-friction elements 58 surround the bearing members 55 and 56 and roll against the outer bearing members 59 and 60 which fit within the head 52. Y The central, outer spacing collar 61 separates the outer bearing members 59 and 60. The bearing members 55 and 56 with the collar 57 areforced against the conical projecting shaft between the'bearing end 59 of the pulley 39 by means of a nut 62 engaging the screw-threadedrear end of the spindle The rear extremity of the nozzle 54 projects out beyond the nut 52 and is exteriorly screw-tln'eaded for engagement with the interior screw-threads of an elbow 63 which is connected by a flexible pipe 64 to a source of water. The water is preferably forced through this pipe by a rotary pump (not shown). The housing nut 52-). as will be seen from Fig. 5. is fl'll'lllQnl with a port 65 at one point in its circumference, and this port alines with a passage 66 leading from the head or housing 52, and forms the means whereby the overflow from the housing or head may be carried off, this out let branch 65 connecting to a flexible pipe 67. It will, of course, be obvious from the above description that the spindle can rotate freely within the housing 14 and within the head or housing 52 and with reference to the nozzle 54, and that water may be continuously supplied to the port of'the spindle and that overflow will be carried off 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 24. Should there be no overflow space water would be forced into the ball bearings. This overflow also allows drainage when supply of water is cut off.

In order to provide 'means whereby the grinding wheel may be adjusted toward or from the axis a around which the grinding wheel rotates to thereby finely adjust the depth of cut, I provide means whereby the housing section 14 and the housing section 25 withit may be axially rotated. To this end, I mount upon the forward end of the carrier 10 an 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 endof 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 7 3, having radially projecting teeth. The opposite end of this shaft 72 carries a worm 74. Thisworm 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 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 compression spring 80 bears against one of the bearing lugs 77 and against a collar 81 carried by the shaft 76 so that normally the clutch member 79 is urgedinto engagement with the clutch'tee'th 78 and thus'the worm wheel 75 is clutched to the shaft 7 6. This members 77 carries a worm 82, and at one extremity carries a knurled hand wheel or knob 83. The plate 68 is mounted upon the carrier 10, and surrounding the extremity of the spindle housing 14 is a worm gear wheel 84. This worm gear wheel 84 has its central opening concentric to the axis of the worm gear. This worm gear wheel is attached to the housing members 14 by screws 85. Worm 82 is keyed to shaft 76 by key 82 Coactin'g with the ratchet wheel 73, as will be later described, and'mounted upon the housing section B and, therefore, held stationary relative to the rotation of plate 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). The walls of the pin passages in the bracket 86 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 urge these pins rearward, that is retract the pins. Mounted upon thesepins 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 leftin Fig; 8. The other cam 109 has its inclined face or hypotenuse facing upwardly, this triangular face 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 andheld thereby out of active position. 7

Mounted upon the shaft 72 rearward of the ratchet wheel 7 3 is a pawl carrying lever 110. This lever is rotatable with relation to the shaft 72 and is held in place by the screw 111. The ratchet wheel 73 is, of course, fast on shaft 72. This lever projects laterally from its axis in one direction to form the relatively long arm of the lever, and the outer end of this arm is provided with a rearwardly projecting pin 112 carrying a roller 113, as shown best-in Fig.11, which rolleris 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 projecting teeth 115 and'116 engageable with the ratchet wheel 7 3. 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 against the rounded apex of the pawl and yieldingly holds the pawl in one or the other of its active positions. The opposite extremity of the lever 110 is formed with a re entrantly'angledcface 119, and disposed on a bracket or lug ,120 projecting from the bearing member 71 is aspringprojected pin 121 projected toward the angular face 119 of the lever by means of a spring 122. Extending from the bracket 71v and specifically from the bearingportion of this bracket is a lug or extension 123 having a forwardly tooth 116 in engagement with'the teeth of the ratchet wheel 73 and bring the tooth 115 out of engagement with the teeth of the ratchet wheel 7 3. On the other hand, if the tooth 116 is engaged with the ratchet wheel 7 3. then upon an upward movement of .the roller carrying end of the l'ever114 beyond a certain point, the tooth 115 will strike the stop 124 and the position of the pawlwill be reversed. Itwili be seen that whenithe 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 68 and with thermain bearing. The roller strikes and glides upon the corresponding cam, andwhen it is struck the inclined end face of this cam will force the roller downward in one direction, and the pawl 114 will carry the ratchet wheel around in one direction, thus giving a partial revolution to the ratchet wheel 73 and giving a partial rotation to the worm 74. This being engaged with worm gear7 5, revolves the worm gear, 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 84 which is attached eccentrically to the rear spindle housing, said housing supporting the front spindle housing 25.- After the. roller 112 has traveled overv 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'plunger121; When a reverse adjustment of the feed is required, the operator forces out cam 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 carn 108 will, of course, need to be shifted to a reverse position in order to operate the cam109, and when the operator carries the cam 109 into position to engage the roller, the tooth 115 of pawl 114 will strike the stop 124, thus throwing the pawl slots 94in the plate 68.

into opposite center of the spring plunger 117 and causing the tooth 116 to engage the ratchet teeth. If the pawl strikes the cam 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 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.

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 worm wheel 84. Upon the release of the knob or wheel 83, the clutch member 79 is automatically reengaged withthe worm gear wheel 75. r

it is desirable to provide means whereby the engagement between the worm gear 84 and the worm- 82 may be adjusted to take up wear. To this end, the front plate 68 is attached to the carrier or main bearing 10 b means of cap screws 93 passing through Attached to the 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 in the end of the carrieror main bearing 10. The screw 96, of course, passes loosely through the perforation in the stud 97 and on each side of this stud are disposed the, knurled nuts 98 'and '99. By releasingthe cap screws 93", theifront 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. Afterithe' 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 o'f'the housing 10 and the axis ofrotation of the spindle 24, thus permitting the axis ofthe' spindle 24' to be located in coincidence with the axis of the housing. i 1

I will be seen from Figs. 1 and 2that the flexible pipes 64 and-67 extend downward through slot 100 whichis 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 oscillata-ble yoke and thus takes care of the independent eccentric action of the head {or elbow 5 2 and"permitsthe free movement of the pipes 64 and 67 rendered necessary by this eccentric action of the various parts.

The work carriage C may beof any suitable design or character and is provided with means whereby it may be longitudinally shifted toward or from the grinding 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, pins, cylinders, pistons, etc., and that where rods or pins are to be ground, the rod or pin or other work will be rotated and carrier 10 will be idle while spindle 24 will rotate aroundthe 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 grinding wheel is disposed within the hollow article and revolves around the central axis a. WVhere 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 provided with a shank portion 103 having clamps whereby it may be engaged with the spindle housing. This guard is preferably in two halves hinged together and is clamped upon the main spindle housing 25 in any desired position. WVater will strike the guard and-be thrown off upon the revolving work. The pump which supplies water to the spindle is controlled by a knob 104 which, when shifted inward, throws the pump out of gear when the water supply is not desired, and which, when pulled outward, throws the pump into gear. 106"(see Fig. 1) is used for shifting the clutch (not shown) which allows for throwing idle the main bearing 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 thespindle carrying emery wheel. 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 speeds of the table:D have not been illustrated, as itis not believed necessary, as these parts are more or less old and Well own.

I have not-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 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 CQllStructioH I A lever will be obvious from what has as desired, either automaticallyby forcing in one or the other'of the

pins

87 or 88, or disconnecting the clutch 79 the feed may be rapidly controlled by means of the wheel 83. The feeding means which I have devised 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, running. The particular construction of the grinding wheel and the means for supplying water thereto provides for the water being sprayed outward by centrifugal force against the face of the work where the Wheel is in direct contact with the work, thereby producing a maxi mum feed at the. point of engagement between the wheel and thework. At the same time, this water passing through the grinding wheel spindle acts to keep the spindle cool. Obviously other liquids than water might be used if desired.

While I have illustrated a construction which has been found thoroughly effective for the purpose intended, yet it will be obvious that many modifications might be made in the details of construction andarrangement of parts without departing from the spirit of the invention.

I claim I 1. In a mechanism of the character .described, a tubular spindle, a grinding wheel mounted thereon and having a recess'in one end face, a nut engaging the spindle and bearing against the grinding wheel and disposed in said recessed end face, the outer face of said nut having radially extending grooves, and a-baflle plate attached to said nut and extending over said recesses therein. 7 2. In a mechanism of; the character described, a tubular spindle reduced-at one end having an exterior screw-threaded extremity, the'bor'e of the spindle flaring toward its extremity, :a grinding wheelsun rounding the reduced extremity of the spindle .and. having a recess in, its outer end face, and a nut engaging the screwthreaded extremity of-the spindle and dis posed within, said recess, said nut having r'adial discharge-ducts communicating with the bore of the spindle, and a. bafile plate 'rinding wheel and at the same time the attached to the face of said nut and form ing the outer wall ofthe said ducts.

In a mechanism of the character described, a tubular, rotatable spindle, 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 of the spindle, and a supply pipe connected to thenozzleb a. In a mechanism: of the character described, a tubular, rotatable spindle, a hol low 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 boreof the spindle, a supply pipe connected to the nozzle, and a discharge pipe' connected tothe head, the head having ducts communicating .with the interior of the spindle to carry off the excess liquid. V p

5. In a'mechanism of thecharacter described, a tubular rotatable spindle, bearings 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 disposed 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 by said plug and discharging into the bore of the spindle, and: a tubular water connection operatively engaged with the nozzle.

6; In a mechanism of the character described, a tubular rotatable spindle, bearings in which the spindle is supported, a fixed hollow head through which the rear end of the spindle projects and open at its opposite ends, anti-friction elements disposed within the hollowhead andsupporting the rear end ofthe spindle," a plug having screw-threaded engagement with the rear end of thehead and having a central aperture, a nozzle having its body rotatably mounted in said aperture, said Inozzle discharging into the bore of the spindle, and a tubular memberYdet'achably engaging the rear extremity of the nozzle andconnected to a source of liquid supply.

7. Ina mechanism of i'the. character dey scribed, a tubular rotatable spindle, bearings supporting the spindle, a-hollow head into which the rear .end' of'the spindle pro- 'ects'.;-said head having-an outleu-the bore of the spindle at the extremity disposed within the head being outwardly flared, a 7

member closingv the rear end of thehead a nozzlearotatably mounted in said member and having a tapering forward end extending in to the fiared'extremity of the spindle, a water supply member operatively engaging the extremity of thenozzle, and means for holding'thelextremity of the spindle in spaicedlrelation to=the extremity ofthe nozzle whereby to leave tween the confronting faces of the spindle and nozzle, the head being formed with a discharge duct leading therefrom and into which said space opens.

S. in a mechanism of the character described, a tubular rotatable spindle, bearings in which the spindle is mounted, a hot low head into which the rear extremity of the spindle projects and having an inturned flange at its forward end, an outer ball racedisposed against said flange within the head, an inner ball spindle, anti-friction elements disposed between the races, inner and outer spacing sleeves abutted against the races, an inner and outer race disposed against the rear ends of the spacing sleeves, anti-friction members disposed between said races, a nut engaging the rear extremity of the spindle and bearing against the inner rearmost race, a plug having screw-threaded engagement 'ith the rear end of the head and having a central aperture, the plug being hollowed out to form a circumferentially extending chamber surrounding said nut and having a discharge duct leading from said chamber, a nozzle rotatably mounted in the opening of the plug and confronting the rear end of the spindle and discharging thereinto, the nozzle and rear end of the spindle being an outlet space berace mounted on the spaced from each other to permit the discharge of water through said space into said chamber and duct and a hollow water supply member engaged with the rear end of said spindle.

9. A mechanism of the character described including a tubular spindle, a grinding wheel mounted thereon for rotation therewith, means for moving the spindle bodily through a circular path eccentric to the axis of the spindle, means at the rear end of the spindle for forcing water into and through the tubular spindle, and means at the rear end of the spindle for carrying off excess water.

10. A mechanism of the character described including a tubular spindle, a grinding wheel mounted thereon for rotation therewith, means for moving the spindle bodily through a circular path eccentric to the axis of the spindle, means at the rear end of the spindle for forcing water into and through the tubular spindle, and means at the rear end of the spindle for carrying off excess water, said means including flexible pipes and a swivelly mounted yoke through which the pipes pass.

In testimony whereof I hereunto aflix my signature.

i H. F. JOSEPH.