US2000667A

US2000667A - Grinding machine

Info

Publication number: US2000667A
Application number: US580269A
Authority: US
Inventors: William C Osterholm
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-12-11
Filing date: 1931-12-11
Publication date: 1935-05-07
Anticipated expiration: 1952-05-07

Description

May 7, 1935. w. c. OSTERHOLM GRINDING MACHINE Filed Dec. 11. 1931 7 Sheets-Sheet l 7 ZUzIZZiam c. aka-Whom v fMf (21: 5

May 7, 1935. w. c. OSTERHOLM GRINDING MACHINE Filed Dec. 11, 1931 '7 Sheets-Sheet 2 7 1711187115?" CUiZZiam C- USterhoZm May 7, 1935.

w. c. OSTERHOLM GRINDING MACHINE Filed Dec. 11, 1931 7 Sheets-Sheet 3 lrwerilfiv CUiZZiam C Usterholm,

May 7, 1935. w. c. OSTERHOLM GRINDING MACHINE FiledDec. 11, 1931 7 Sheets-Sheet 4 William 0 Osierho'lm.

y 7, 935. w. c. OSTERHOLM 2,000,667

1 1 GRINDING MACHINE Filed Dec. 11, 1951 V 7 Sheets-Sheet 5 InUmfLaT-I": William G Osterholm.

y 7, 1935. w. c. OSTERHOLM 2,000,667

GRINDING MACHINE Filed Dec. 11, 1951 7 Sheets-Sheet 6 JTweTW-r": William C. Osterholm.

May 7, 1935. w. c. OSTERHOLM GRINDING MACHINE Filed Dec. 11, 1931 7 Sheets-Sheet '7 William O Osierholm Patented May 7, 1935 UNITED STATES PATENT OFFICE 13 Claims.

.3 justable vertically with the remaining work supporting surface being stationary. An annular grindingwheel is suitably mounted within the frame with its axis of rotation substantially vertical, the frame being provided with means whereby the mounting and grinding wheel are vertically adjustable to compensate for the wear of the wheel. For efficient operation of grinders it is necessary to supply sufficient cooling fluid to the grinding wheel to wash away the grit and accordingly the invention incorporates novel means including a plate positioned within the annular grinding wheel for discharging a continuous and adequate supply of cooling fluid radially outwardly toward the wheel and a trough for draining and carrying away the waste fluid.

In view of the above, the primary object of the invention is to provide a grinder for surface grinding work which will be of extreme simplicity in construction, which can be cheaply manufactured, and one that will be efficient in operation, permitting a wide range of adjustability for various work.

A further object is to provide a grinding machine which will be compact and wherein means will be embodied permitting ready and convenient adjustment of the grinding wheel to compensate for wear and adjustment of the work' support so that the desired thickness may be ground from the work with the least amount of delay on the part of the operator.

A further object is to provide a horizontal grinder having the face of the grinding wheel disposed horizontally, the grinding wheel having associated therewith a horizontal and stationary table and a vertically adjustable work support.

Another object is to provide a horizontal grinder of the type described, which will be capable of fine adjustment for causing feeding of the grinding wheel independent of the'adjusting mechanism for the work support.

A further object is to provide a grinder having novel means for supplying a continuous stream of cooling fluid such as water to the grinding wheel of sufficient force and volume to keep the work cool and to wash away the grit so as to maintain the grinding face clean, and which will also embody means for draining the water, provision being made for protecting the rotating parts of the machine.

Another object is to provide a horizontal grinder having a horizontal table, work support, and a grinding wheel associated therewith, and one wherein the wheel will be mounted for rotation by means of a vertically mounted spindle, the spindle and power means for driving the same all being adjustable to permit adjustment of the grinding wheel.

A further object is to provide an automatic feed and adjustable work holder specially adapted for association with the type of grinders disclosed, the feeding having a separate drive and incorporating as an additional feature a hand operated feed whereby the work may be quickly brought into contact with the grinding wheel.

With these and various other objects in view, the invention may consist of certain novel features of construction and operation as will be more fully described and particularly pointed out in the specification, drawings and claims appended hereto.

In the drawings which illustrate an embodiment of the device and wherein like reference characters are used to designate like parts- Figure 1 is a perspective view of the grinding machine constructed in accordance with the present invention;

Figure 2 is a longitudinal sectional view taken substantially through the center of the machine shown in Figure 1;

Figure 3 is a transverse sectional view taken along the plane indicated by line 3-3 of Figure 2;

Figure 4 is a sectional view taken along the plane indicated by line 4--4 of Figure 2-;

Figure 5 is a fragmentary plan view, parts being shown in section of the frame and grinding wheel and means by which'the wheel is supplied with a cooling fluid;

Figure 6 is a detail sectional view taken along the plane indicated by the line 6-6 of Figure 5;

Figure '7 is a fragmentary elevational view showing the adjusting means for the work sup- Figure 8 is a fragmentary sectional view showing the spindle supporting a'modified form of grinding wheel;

Figure 9 is a plan view illustrating a method of arranging a plurality of grinders for performing work on an article of usual width;

Figure 10 is a front elevational view, parts being shown in section of the horizontal grinder of the present invention showing the sa equipped with an automatic feed and a work olding device;

Figure 11 is a top plan view of the grinder showing the feed and work holder in operative positions; and

Figure 12 is a. side elevation of the grinder with attachments as shown in Figure 10.

Referring to Figure l of the drawings, the invention is disclosed as comprising a supporting base or water pan l0, having marginal flanges II, and provided with a plurality of spaced supports |2 upon which are mounted a box-like frame indicated in its entirety by M. The frame, as shown in Figure 4, comprises a plurality of end walls l5 and side walls I6, a portion of the left end wall being broken away to provide an opening IT for permitting discharge of the waste cooling fluid. In this connection the water pan I8 is provided with a water channel l8 having a drain opening I9 and a supply opening 20, while at the opposite end of the channel means are provided for conducting the cooling fluid to the grinding wheel, all of which will be presently described. The frame |4 houses the operating mechanism of the machine and is provided at its upper end with inwardly directed flanges 2| to which is secured at one end a stationary work support or table 22. The table is provided with a. marginal trough 23 which serves to conduct the waste cooling fluid to openings 24, as shown in Figure 6. The remaining work supporting surface includes a movable work support 25 provided with a marginal trough 2B which communicates with openings 24 for discharging the fluid as described. The work support 25 is formed with sloping bearing surfaces 28 formed, as more clearly shown in Figure 3, V-shaped and which have bearing engagement with "sloping co-operating bearing surfaces 29 provided on the side walls |6, respectively. This mounting of the Work support 25 upon sloping bearing members permits the support to be raised or lowered as desired by adjusting the position of the same on its supporting guides.

Adjusting means for the work support include, as shown in Figure 4, bearing members 30 formed on the right end wall l5 and which serve to journal in the frame a transverse shaft 3 the shaft having a reduced portion 32 at one end, to which is secured by nut 33 an operating arm 34. Positioned centrally of the shaft 3| is a stud 35 having a reduced portion 38 fitting in an opening in the shaft and by means of which and the nut 31 the stud is rigidly held to the shaft. Pivotally secured to the upper end of stud 35 is link 38, the link having its outer end pivotally secured to the rear wall of the work support 25 by means of the lugs 40 and pin 4|. By the above construction it will be seen that to cause movement of the work support 25 on the guides 29 formed on the frame it will only be necessary to rotate the transverse shaft 3|, the movement being transmitted to the work support through the linkage described. A portion 42 of the frame I4 is indented, Figure 4, and has suitably secured therein a plate 43 pro-vided with a hori zontal slot 44. The arm 34 at its end opposite its connection to shaft 3| is provided with a circular opening by means of which the adjusting disc 45 is rotatably fitted to the arm. A stud 46 is eccentrically located in disc 45 and is adapted to ride within the slot 44 so that the disc upon being rotated will function as an eccentric to cause a. raising or lowering, as the case may be, of the adjacent end of arm 34. This movement of the arm is sumcient to cause the necessary movement of transverse shaft 3| in order to impart the desired movement to the work support 25.

Located between the stationary table 22 and the movable work support 25 is an annular grind ing wheel 48 mounted for rotation and for movement vertically by means mounted within the frame which will be presently described. Positioned concentrically with the grinding wheel 48 is a circular plate 49 suitably secured to a discharge disc 50, Figure 2, the disc in turn being supported on the standard 5|. The standard 5| at its lower end is formed with a reduced threaded portion 52, by means of which the same is threaded into the hub 53 formed on the base of the water pan. For conducting the cooling fluid from channel I 8 to the grinding wheel 48 the standard 5| is provided with a central bore 54 which communicates with opening 55 in plate 50. As shown in Figure 5, the surface of plate 50 is formed with a plurality of radially extending channels 56, each channel having communication with the opening 55 and thus the bore 54. By the above structure the cooling fluid from the water channel I8 is conducted to a point adjacent the grinding wheel and is radially discharged through channels 56 toward the inner surface of the wheel 48. Suitable means are provided, which will be presently described, for conducting the water from the trough 23 and discharging the same to any suitable receptacle positioned outside of the frame M.

A feature of the invention is the provision of the stationary table 22, the circular table 49, which is likewise stationary, and which is preferably positioned so that its surface is in horizontal alignment with the surface of table 22, Figure 2, and of the movable work support 25, the position of which can be adjusted with relation to the grinding wheel 48 and likewise the stationary supporting means 22 and 49. For guiding the work on'the supporting surfaces one side wall of the frame, as shown in Figure 3, is provided with supporting members 57, in which are pivotally supported arms 58. A longitudinal guide 60 is held to the members 58 by means of tightening screws 6|, the screws being provided with a stud 62, by means of which they can be rotated, permitting the positioning of the guide 60 as desired. Provided on the stationary table 22 on the side opposite the guide 60 are supporting lugs 63 adapted to receive the depending arms 64 for suitably supporting in upright position the uide 65. In similar manner the work support 25 is also provided on the side opposite the guide 5.! with lugs 63 for receiving the arms 66 so as to support a co-operating guide 61.

In order to compensate for the wear of the grinding wheel 48 the same is mounted for movement vertically, the mechanism for accomplishing the same being located within the frame I 4, as shown in Figure 2. The wheel 48 is suitably mounted on plate 68, which in turn is secured by screws 69 to the horizontal flange on the spindle 1|. The spindle is mounted for rotation in a cylindrical spindle housing 72 by means of the ball bearing assemblies 13 positioned at the upper and lower ends of the spindle, respectively. The housing 12 has integrally formed therewith a base 14 adapted to support an electric motor for driving the spindle and the grinding wheel 48. Also integrally formed with the spindle housing 12 are supporting guides 16, Figures 3 and 4, by means of which the housing and spindle rotatably supported thereby are mounted for vertical movement. Also integral with the spindle housing I2 and supporting guides I6 is a sloping or partition wall I8 having marginal upstanding flanges I9, the sloping wall I8 functioning to collect the waste cooling fluid discharged from openings 24 and deliver the same to a trough 88 formed integral with the end and side walls at the left end of the frame.

For mounting the housing I2 and the base and partition integral therewith for vertical movement within the frame I4, the side walls I6 are provided with vertically extending outwardly dished portions 8| receiving guiding members 82, v-shaped in section, as shown in Figure 4. Located between the guide members 82 and the portions 8| is a Babbitt-metal filler 83. Threaded bushings 84 are located at spaced intervals in portions 8|, the bushings being apertured for re- 'ceiving the securing bolts 85, by means of which the V-shaped guide members 82 are secured to the frame.

The spindle housing I2 and parts integral therewith are supported within the frame I4 above the water pan I8 by means of a shaft 86 rigidly secured by bolts 81 to the base of the water pan. Shaft 86 is threaded at its upper end, the portion having threaded thereto a pinion 88 suitably located between an upper wall 89 and a lower wall 98 formed integral with the spindle housing, respectively. A ball bearing assembly 9| is positioned between the upper surface of the pinion 88 and the upper wall 89 in order to minimize the friction, tending to prevent rotation of the pinion.

In Figure 4 an operating shaft 92 is shown provided with an operating handle 93, the shaft being suitably journalled in

bearings

94 and 95, hearing 94 being integral with the spindle housing, while bearing 95 comprises a bushing threaded to the housing. Suitably keyed to shaft 92 is a worm gear 96 mounted between ball bearing assemblies 81 and adapted to have meshing engagement with pinion 88 threaded to stationary shaft 88.

As the grinding wheel 48 wears, due to the grinding operations performed by the same, it can be readily fed in a vertical direction so as to compensate for the wear by means of the construction above described, wherein the spindle housing I2, by means of guides I6 integral therewith is mounted for vertical movement within the frame and which can be adjustably' positioned vertically in the frame by rotation of the operating handle 93 rotating the worm gear 98 to in turn rotate the pinion 88. It will be clearly seen, Figure 2, that rotation ofthe pinion 88 will, by reason of its threaded engagement with shaft 86, serve to position the pinion vertically on the shaft, and since the housing I2 and parts integral therewith are friotionlessly carried by the pinion, the same will also be positioned ver- I 'tically as desired. The spindle housing I2, however, has rotatably mounted therein spindle 'II carrying the grinding wheel 48 and thus the grinding wheel will have vertical movement in accordance with the vertical adjustment of the housing.

The motor I5 forming the means for driving the spindle 1| has been described as supported on base I4, the base being integral with the housing. The motor shaft I has suitably keyed thereto a sprocket I8I having meshing engagement with a chain drive I82, the chain also having meshing engagement with a sprocket I83 suitably keyed to the lower end of the spindle 'II so that rotation of the motor is imparted to the spindle. A sprocket lock nut I84 is threaded to spindle II below the sprocket I83 and serves to hold the sprocket in place vertically on the spindle. For supporting the chain I82 and to prevent sagging of the same a fiber wear plate I is provided, the same being positioned between base I4 and a bottom closure plate I86, which is suitably secured to the housing by means of screws 'I8'I. A lower spindle nut I88 is threaded to the lower end of the spindle II and completes the spindle assembly, while at the upper end of thehousing secured to flange I8 is a dust ring I83.

In the operation of the machine the grinding wheel 48 is adjusted so'that its face is in horizontal alignment with the stationary table 22 and circular table 49 which function as a support for the ground portion of the work. For supporting the work proper the movable support 25 is provided, the support being vertically adjustable so that the relation of the work with respect to the grinding wheel 48 can be varied as desired to grind therefrom any thickness of metal. Movecause rotation of transverse shaft 3 I, which movement is correspondingly imparted to the support through the

linkage

35 and 38. The construction of the eccentric disc 45 is such that extremely minute adjustment ofthe work support is possible.

The grinding wheel 48, as has been described, is mounted for frictionless rotation by means of the ball bearing assemblies I3 in the spindle housing and the spindle I5 by means of the connecting chain I82. The water channel I8 is adapted to be connected by means of opening 28 to any source of water supply under pressure, which is conducted by means of the bore 54 in the standard 5| to the mounting plate 58. The radial channels 56 discharge the water toward the inside surface of the grinding wheel 48. It will be seen that part of the water only will work its way between the wheel and the circular table 49 and serve as a cooling medium and also as a means for washing the grit from the face of the grinding wheel and the Work. The waste cooling fluid is collected by the

troughs

23 and 28 and is discharged through openings 24 to the sloping partition I8 positioned directly be- -low the openings and which in turn discharges the fluid to the trough 88 where-it is conducted to any suitable container located outside of the frame. The excess cooling fluid will be discharged through the opening between the spindle 1| and the standard 5| to the water pan I8 where Q is driven from the motor the supporting surface of one machine to that. v

of the other, as will be clearly understood.

. In Figure 8 a modified\form of grinding wheel I48 is shown, the same being suitably mounted upon a mounting plate I58. The same structure for mounting the plate and wheel for rotation is employed, including a spindle I'II having a horizontal flange "8, to which the mounting plate is.

secured, the spindle being rotatably mounted in a spindle housing I'I2. This form of grinding wheel has been found useful in grinding stone, marble and similar materials, in those instances where a contour of particular configuration is desirable. In the operation of the machine equipped with a wheel of this shape the work is preferably oscillated transversely on the work supporting surfaces and accordingly it is generally necessary to remove the work guides.

The present type of horizontal grinder permits the association therewith of an automatic feed and Work holding device, the former having a separate drive and serving to feed the work into contact with the grinding wheel at the desired rate of speed while the work holder through resilient means holds the work firmly upon the work sup porting surface. In Figure 10 the frame consisting of end and side walls, respectively, has one side wall provided with supporting members I15 pivotally mounting the supporting arms I16 which overlie the work supporting surface of the grinder and have pivotally secured by means of bolt I11 a carrying plate I18, the same extending sub-' stantially the length of the frame and having secured thereto in spaced relation a base plate I19. As clearly shown in Figure 12 the base plate ter minates at points a slight distance inward from the ends of the top or carrying plate but is of a width substantially equal to that of the top plate. The structure provides aligned grooves for the reception of an endless chain I formed of a plurality of links connected in the usual manner by means of pins I8I, the same projecting into the aligned grooves in the top and base plates, respectively, and serving to retain the chain between the plates.

For purposes of the automatic feed the chain at desired intervals provides work engaging members I82 projecting a substantial distance outwardly of the plate structure and being so associated with the chain as not to interfere with the driving means therefor.

Provided at one end of the carrying plate I18 is a gear housing I83 providing a gear wheel I84 and a driving gear I85 operatively connected therewith, the latter being positioned in the plate structure and having meshing engagement with the chain. A motor I 86 is also suitably supported by the carrying plate and through speed reducing means including a pinion I81, is operatively connected with the driving gear. The above provides a suitable drive for the endless chain I80, causing the members I82 to feed the work to the grinding wheel of the grinder at the desired rate. As the supporting arms are rotatably associated with the frame and pivotally support the carrying plate the automatic feed is adjustable with respect to the grinding wheel and can be positioned as desired, any suitable means being provided for holding the same in adjusted position.

In order to associate the work with the grinding wheel as quickly as possible a hand operated drive is provided including a housing I88 located on the carrying plate at the end opposite the motor drive and having a wheel I89 with handle I90 suitably journalled therein. Rotation of the wheel drives pinion I9I, in turn meshing with the driving gear I92 of the chain. The wheel is rotated by the operator imparting rotation to the driving gear and causing travel of the members I82 in the desired direction, preferably for bringing the work into contact with the grinding wheel. It will be understood that such actuation of the endless chain can only be accomplished by the provision of a suitable overrunning clutch in the motor drive and the present invention contemplates that such a clutch is located in the housing I83. After the work has been brought into contact with the grinding wheel through the hand operated drive the motor I86 can be started, whereupon the endless chain is thereafter driven at the desired rate of speed throughout the grinding operation.

A support I94 suitably secured to one side wall of the frame provides spaced lugs. I95 for journalling the arm I96, the same in turn pivotally secured to a second arm I91. As shown in Figures 10 and 12 this latter arm has mounted therein for movement vertically a rod I98 provided on one face with arack 200 meshing with pinion 20I suitably secured to the transverse shaft 202. The structure provides a work holder and for the purpose the rod I98 is formed tubular for a part of its length and receives the coil spring 203, the spring forcing the stud 204 downward and maintaining the same against a suitable stop. Shaft 282 is rotated through handle 205 and through rotation of the pinion 29I the rod can be located in desired position with respect to the supporting arm and work supporting surface of the grinder. Any form of adapter 296 is associated with the stud 204 for contacting the work on the grinder, the adapter being lowered and resiliently holding the work on the work supporting surface of the grinder through rotation of handle 205. After the desired tension on the work is secured the parts can be locked in position through means of the ratchet 201 providedon shaft 292 and pawl 298 pivotally secured to the support I91.

The arrangement of automatic feed and work holder cooperate to hold the work resiliently but firmly upon the work supporting surface of the grinder and to feed the work into contact with the grinding wheel at the desired speed. The work holder is universally supported upon the support I94 and can be located directly over the grinding wheel where it is generally necessary to maintain the work firmly against its supporting surface, or if desired, can be located to either end of the frame. The provision of resilient means for the work holder serves to maintain the work firmly upon the surface and to allow for vertical adjustment of the support 25. Also the provision of pivoted supporting arms for the holder allows the work to be fed automatically toward the grinding wheel by the feeding means disclosed and in addition adjustably sup ports the holder with respect to the work supporting surface. By lifting the pawl 298 the handle can be rotated to lift the adapter from the work, and can be held in raised position out of the way of the work by merely releasing the pawl whereupon its engagement with the ratchet holds the shaft 282 from rotation.

It is to be understood that I do not wish to be limited by the exact embodiment of the device shown, which is merely by way of illustration and not limitation, as various and other forms of the device will of course be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims.

I claim:

1. In a grinding machine, a frame having end and side walls, and a substantially horizontal sur face for supporting objects thereon, a grinding wheel, means mounting said wheel with its axis of rotation substantially vertical, said means including a housing, vertical guides provided on said housing, and means secured to said side walls for receiving said guides, whereby said housing is mounted for vertical movement.

2. In a grinding machine, a frame having end and side walls, and a substantially horizontal surface for supporting objects thereon, a grinding wheel positioned adjacent the supporting surface, a spindle to which said wheel is secured, a housing mounting said spindle for rotation, a motor supported by a base projecting at right angles from and integral with said housing, a chain operatively connecting said spindle and motor, means mounting said housing for vertical movement, including vertical guides provided on said housing, and means secured to said side walls for receiving said guides, and .a supporting shaft supporting said housing for movement vertically thereof whereby said grinding wheel is vertically adjustable.

3. In a grinding machine, a frame having a substantially horizontal surface for supporting objects thereon, a grinding wheel, means mounting said wheel with its axis of rotation substantially vertical including a tubular spindle to which the wheel is secured, a housing mounting said spindle for rotation, a tubular standard extending through the spindle, a circular plate sup ported thereby, said standard serving to conduct a cooling fluid to the wheel, and said circular plate functioning as a work support.

4. In a grinding machine, a frame having end and side walls, and a substantially horizontal surface for supporting work thereon, a grinding wheel, means mounting said wheel with its axis of rotation substantially vertical, including a spindle, a housing mounting said spindle for rotation, guides secured to the side walls, co-operating guides secured to the housing and adapted to engage said first mentioned guides, and means for adjusting the vertical position of said housing, comprising a threaded stationary shaft, a pinion threaded to said shaft and having engagement with thehousing, and means for rotating said pinion.

5. In 'a grinding machine, a frame having end and side walls, and a substantially horizontal surface for supporting work thereon, a grinding wheel, means mounting said wheel with its axis of rotation substantially vertical, including a spindle, a housingv mounting said spindle for rotation, guides secured to the side walls, co-operating guides integral with the housing and adapted to engage said first mentioned guides, and means for adjusting the vertical position of said housing, comprising a threaded vertical shaft, a pinion threaded on the shaft, said housing and spindle being frictionlessly supported by said pinion, and means journaled in said housing for rotating said pinion.

6. In a grinding machine, a frame having end and side walls, and a substantially horizontal surfacefor supporting work thereon, an annular grinding wheel, means mounting said wheel with its grinding face in horizontal alignment with the supporting surface, including a spindle to which the wheel is secured; a housing adjustably mounted within said frame, said spindle being rotatably mounted in said housing, a circular plate positioned concentric with said wheel, a standard for supporting said plate, a bore in said standard, said bore serving to conduct a cooling fluid to said wheel, and said plate forming a work support.

7. In a grinding machine, a frame having its top horizontal surface formed by a stationary plate and a movable work support, an annular grinding wheel rotatably mounted by the frame and positioned between the plate and work support, a circular plate within the wheel supported by a standard, a plurality of radial passages provided by said circular plate and communicating with a bore extending longitudinally of the standard, whereby a cooling fluid flowing through the standard is discharged from said passages against the grinding wheel.

8. Ina grinding machine, a frame having a horizontal work supporting surface, a movable work support mounted on the frame and providing part of said supporting surface, a housing supported by the frame for vertical adjustment, a spindle journaled in the housing and supporting an annular grinding wheel with its grinding surface in substantial alignment with the work supporting surface of the frame, a circular plate located within the grinding wheel, said plate having spaced openings around its periphery for discharging a cooling fluid to the grinding wheel, and means provided by the housing for collecting the waste fluid and conducting the same to a receptacle.

9. In a grinding machine, a frame having a horizontal work supporting surface, a'movable work support mounted on the frame and providing part of said supporting surface, a housing supported by the frame for vertical adjustment, a spindle journaled in the housing and supportg an annular grinding wheel, said wheel being p itioned between the stationary and movable W01 supporting surfaces of the frame, a circular plat located within the wheel and completing the work supporting surface, discharge openings in the periphery of the plate for supplying a cooling fluid to the grinding wheel, and a trough provided by the housing and located below the wheel for collecting the waste fluid.

10. In a grinding machine, a frame having a horizontal work supporting surface, a movable work support mounted on the frame and providing part of said supporting surface, a housing supported by the frame for vertical adjustment, a spindle journaled in the housing and supporting an annular grinding wheel, said wheel being positioned between the stationary and movable work supporting surfaces of the frame, a circular plate located within the wheel and completing the work supporting surface, and discharge openings in the periphery of the plate for supplying a cooling fluid to the wheel.

11. In a grinding machine, a frame having upstanding walls and a substantially horizontal surface for supporting a work piece thereon, an annular grinding wheel located adjacent the work supporting surface, a circular plate positioned concentric with said grinding wheel, a

standard supporting the plate with its top surface horizontally aligned with said work supporting surface, said standard supplying a fluid to said grinding wheel, an adjustable work support mounted on said upstanding walls and cooperating with said annular grinding wheel, and a trough formed around the sides of said work supporting surface and work support to collect the waste fluid from the wheel and to deliver the same to a receptacle.

12. In a grinding machine, a frame having upstanding walls and a substantially horizontal surface for supporting a work piece thereon, an annular grinding wheel located adjacent the supporting surface, means mounting said grinding wheel with its axis of rotation substantially vertical including a housing, means supporting the justable, a trough formed around the sides of said work supporting surface and work support for collecting the waste fluid from the grinding wheel, and means formed integral with said housing for receiving the waste fluid from openings in the trough and for delivering the same to a receptacle.

13. In a grinding machine, a frame having upstanding walls and a substantially horizontal surface for supporting a work piece thereon, an annular grinding wheel positioned adjacent the supporting surface, means mounting said grinding wheel with its axis of rotation substantially vertical including a housing, means mounting the housing for vertical movement including guides on the housing and upstanding walls respectively, a circular plate positioned within the grinding wheel, a standard supporting said plate with its upper surface horizontally aligned with the work supporting surface, said standard supplying fluid to said grinding wheel, a work support carried by said upstandingwalls and being vertically adjustable, a trough formed around the sides of said supporting surface and work support for collecting the waste fluid, and means formed integral with said housing and located under the trough for receiving the fluid from openings in said trough and for delivering the same to a receptacle.

WILLIAM C. OSTERI-IOLM.