US1394418A - Grinding-machine - Google Patents

Description

G. W. LANT.

GRINDING MACHINE.

APPLICATION man 0:0.3, 191 1.

Patented Oct. 18, 1921.

2 SHEETS-SHEET I.

- fl/INVENTOW 5717 'w G. W. LANT.

. GRINDING MACHINE.

APPLICATION FILED 0503,1917.

1,394,418. Patented 001318, 1921.

2 SHEETSSHEET 2.

& if by UNITED STATES PATENT OFFICE. I

GEORGE W. LAN '1, OF PROVIDENCE, RHODE ISLAND, ASSEGETOR TO ABRASIVE MACHINE TOOL 00., OF EAST PROVIDENOE, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

Specification of Letters Patent.

GRINDING-MACHINE.

Patented Oct. 18, 1921.

Application filed December S, 1917. Serial No. 205,068.

To all whom it may concern:

Be it known that I, Gnonon W.v LANT, a citizen of the United States, residing at Providence, in the county of Providence, State of Rhode Island, have invented certain new and useful Improvements in Grinding Machines, of which the following is a specification.

My invention relates to grinding-machines and particularly to that type of machine in which the work and grinding-wheel are rotated continuously on opposite centers, with one of said elements reciprocated in relation to the other so that the wheel operates progressively along the work. The object or my invention is to provide an improved and simplified drivingnneans for either the workholdingor grindingwheel spindle wherein to permit of relative r ci nocation between these two elements and whereby to allow for angular, axial adjustmentbetween the workand wheel.

The invention comprehends these and certain other improvements in the arrangement and method of operation of the driving-connections of the machine as fully set forth in the following specification, illustrated by the accompanying drawings, in which like reference characters designate like parts. In the drawings Figure l is a front elevation of the coinplcte grinding-machine, showing its base or t 'ame partly in section to illustrate the driv ing-eonnections for the spindle carried by the rcriprocable headstock;

Fig. 2, an end view of theheadstock showin; the reciprocating table on which it is mounted and the ways on which the latter slides; and

Fig. 3, an enlarged, vertical, sectional view of the headstock, illustrating the connections between the horizontal. drive-shatt and the spindle.

Referring first to Fig. 1, the machine in general comprises a standard or bed B; a horizontal table T reciprocable thereon; an angularlyauljustable tahle T" swiveled to the table T; a headstock H carried by the table T and provided with bearings :i'orthe work-spindle and a carriage or slide C having bearings for the grinding-spindle b. The carriage (I is mounted on a standard 7) projecting upwardly from the frame or bed B at on end thereof, and is arranged to slide laterally on suitable ways or guides, not herein shown, to urovide for the feed of the grinding-wheel The gr1nding-spin- .dle S rotates in bearings in a sleeve 8 held in a split bearing 0 at the side or" the slide or carriage C and the grinding-wheel G is attflillGCl thereto at the left-hand end through any convenient means whereby it may be readily removed and other wheels of ditlerent sizes and shapes substituted in its place. At its right-hand end the grindingspindle it carries a pulley P connected by a belt' to a larger pulley P rotatable at the end of a bearing C. The pulley P is driven from the main drive-shaft D or" the machine through a belt or other connections passing up through the bed but as these elements are not essential to the present improvements they are not herein shown or de- ,e ibed, It will he noted that the pulley P has a relatively wide face to provide tor the sliding of tle belt o therealong when the grinding-spindle S is adjusted longitudinally in the carriage C. This latter adjustment is accomplished by loosening the screws or bolts 0 in the split bearing 0 to allow the sleeve 8 to he slid therethrough.

On the top of the bed 13 aretwo longitudinally extending ways lV, W, one of which lV is formed with a f-groove or channel to as shown in Fig. 2. The ILClPlOCftlDlB table T is termed on its under side with runners V, V which slide on the ways W W, one or" them V being of V-shape in cross section to fit the groove in the way W. Referring to Fig. 1, the standard 7) at the end of the bed B is cut away at its center to bridge the table T to allow the latter to slide thereunder. Secured to the bottom of the table 1 is a rack-bar R formed with teeth adapted to mesh with a pinion O at the right-hand end of the machine, see Fig. l. The pinion O is driven -from the main drive shaft D of the machine through suitableconnections, not herein shown and described, and rotated in alternately opposite directions by means o't' an automatically operated clutch-device as usually provided, Through this arrangement the table T is reciprocated hack and forth relatively to the grindingwheel G and the extent of its traverse is regulated by suitable adjusting-means as well known and generally used in machines'of this type.

Swiveled on the top of the table. T is the angularly-adjustable table T which carries the headstock H for the work-spindle S The spindle S is driven from a horizontal. shaft K journaled in fixed bearings L, L on the interior of the bed or frame B. At its. right-hand end the shaft K is connected by a train of gearing to the main drive-shaft D, the usual prac ice being to employ change-gears or other speed-adjusting devices to provide for regulating the speed of the work-spindle, but as such mechanisms are familiar to those skilled in the art the arrangement is not herein shown or described.

Referring now to the enlarged view, Fig. 3, the left hand bearing L for the shaft K is preferably made adjustable both vertically and horizontally to provide for its accurate alinenient with the opposite bearing L which is fixed to the bed B. 0n the overhanging, left-hand end of the bed B is a hub or bearing bored vertically to receive a bushing M which is formed with a flange m adapted to abut the under side of the hub. The bushing hit is provided with a bore m arranged eccentric to its axis and adapted to receive a bolt or stud Z which is screwed up into a hub Z on the bearing L. The hub Z is threaded to receive a nut N which abuts the top of the hub Z), and a washer N is interposed between the head of the stud Z and the under side of the bushing M. By releasing the nut N and turning the stud Z the bearing L may be raised or lowered in relation to the bushing M to regulate the vertical position of the end of the shaft K; and by turning the bushing M in its bore in the hub b the bearing L may be adjusted laterally and longitudinally to a slight extent as required. After the bearing L has been properly alined with the bearing L in this manner the nut is set up against the hub b to lock the bearing in place. The end of the shaft K is reducedin diameter where r it extends through the bearing L and a.

thrust-washer interposed between its shoulder and the end of the bearing. At its outer extremity the shaft K is reduced again and screw-threaded to receive a nut n which binds a second washer 3" against its shoulder abutting the other end of the bearing L.

As before indicated the shaft K drives the work-support or spindle S through a train of gearing, one of the elements of which is slid'able along the shaft to provide for the traverse of the spindle in relation to the grinding-wheel. As shown in Figs. 1 and 3 the shaft K is formed with longitudinal splines or keys 7c, 70, preferably four in 1'1L1Il1 ber, extending ubstantially its whole length between the bearings L, L. Slidably mounted on the shaft K and keyed rotatively thereto by the splines 7.0 is a bevel-gear 2 having its hub journaled in a bearing to which depends. from the table T. The bearing u consists of a hub formed integral with a vertical sleeve U which extends upwardly tlnough bores. t, t in the tables T and T. At its lower end the sleeve U is provided with a flange n which abuts the face of a hub or boss 25 on the under side of the table T, and screws 3 reaching up therethrough and into the boss prevent the sleeve from turning in the. bores t. The hub or hearing a is supported 011 a curved arm l which forms an extension of the flange n and is bored at right-angles to the axis of the sleeve U. Fitted to the bore of the hub a is a bushing 16 in which the turned down hub 5 of the gear 2 is journaled, a thrust-washer 6 being interposed between the shoulder on the gear and the end of the bushing, while a nut e is screwed onto the outer end of the hub to hold the gear in place. The nut e is. secured in place on the end of the hub 5 of the gear 2 by a key 7 fitted to a slot in its bore and clamped against the threads on the hub by a set-screw 8.

The gear 2 meshes with a bevel-pinion 9 which is keyed to the shouldered end of a vertical shaft 10 at 11 and held in place thereon by a nut 12. The shaft 10 is rotatable in the atrial bore 13 of the sleeve U, the central portion of the bore being chambered out to provide two spaced-apart bearings as shown. At its upper end the shaft 10 carries a bevel-gear 1% formed integral therewith, or secured thereon if preferred, the bottom of the gear abutting the side of a thrust-washer '15 interposed between it and the end of the sleeve U.

The sleeve U, besides providing bearings for the gear 2 and vertical shaft 10, also serves as the axial pivot or center on which the table T swivels to allow for its angular adjustment in a horizontal plane. As shown more particularly in Fig. 1 the table T extends substantially the full length of the table T and rests on raised spots or bosses 16, 17 and 18, spaced at intervals to provide an extended bearing or support. At its left-hand end the main bearing for the table T consists of the annular, raised face 16 fitted to receive the ring-like hearing 19 of the table T on which the circular base It of the headstock H rests. The sleeve U extends upwardly through the bores 27, t in the tables T, T, the bores being concentric with the bearing-rings 16 and 19,. and also reaches into a coaxial bore h in the base, of the headstock. H to provide for the proper alinement of these parts. Referring to Fig. 2, the. headstock H is secured in. position on the table T by means of bolts 20, having their heads. fitted to T slots 21. formed in the top of. the ring 19, with their ends projecting up through bosses 22. Nuts 23 are screwed onto the ends of the bolts, 20 against the washers 24 to clamp the base A of the headstock against the ring 19; and by loosening the nuts the headstock may be turned on its axis to adjust the position of the workspindle S. The main adjustment for the spindle S, however, is provided by the swiveling of the table T on the axis of the sleeve U. As shown in Fig. 1 the table T is secured in place on the table T by means of bolts 25 extending through arcuate slots 26, see Fig. 2, formed in extensions 27, 28 at either end of the table T, and screwed into the bosses 29, 18 on the top of the table T. For convenience in adjusting the work-s )indle S in relation to the grinding-wheel (I a scale or index X is mounted on the right-hand end of the table T and a pointer 00 on the table T cooperates therewith to register and indi cate the degree ofangularity.

Surmounting the circular base it of the headstock H are two uprights or standards 31, 32 formed at the top with cylindrical bearings 33, 3% for the work-spindle S. Fitted to the bearings 33, 34 are tapered sleeves or bushings 35 and 36 held in place by nuts 37, 38 and 39, 4O screwed onto their ends to provide for tightening them in the bores of the bearings. At its right-hand end the spindle S is formed with a flange 41 which abuts the end of the bushing 36, and secured to its outer extremity is a. sleeve or collar 42 to which the chuck or face-plate for carrying the work may be secured. This latter element is not herein shown or described as it may be of any suitable construction as generally employed in the art. Abutting the inner end of the bushing 36 is a collar 44: screwed onto the threaded portion 45 of the spindle S. The collar 44 is adjusted against the end of the bushing 36 to take the end thrust of the spindle S in one direction, while the flange 41 takes the opposite thrust against the outer end of the bushing. To prevent the collar 44; from turning on the spindle S after it has been adjusted in position clamp 46 is employed to bind on the threads 45. The clamp 46 is fitted to a slot in the collar 44 in the manner of a key and is clamped against the threads by means of a set-screw 47. The central portion of the spindle S is reduced in diameter at as and fitted thereto is a clutch-member 50, held rotatively therewith by a key 51, but free to slide axially therealong. The clutchmember 50 is formed at one end with ratchet-teeth 52 adapted to engage opposite teeth 54 on the hub of gear or sprocket 55. The sprocket 55 is free to rotate 011 the spindle S and is fitted with a bushing 56 in its bore to provide againstwear.

Below the spindle S is a smaller, parallel shaft 57 held fixedly in hubs 58, 59 on the standards 31, 32. Rotatable on the shaft 57 is a bevel-gear 60 having its hub formed as a sprocket 61 adapted to be connected to the sprocket 55 by means of a link-belt or drive-chain 62. The gear 60 is fitted with a bushing 63 and is held from end move ment on the shaft 57 by a sleeve 6%, abutting the end of its hub and the hub 59. The teeth of the gear 60 mesh with those of the gear 14: on the upper end of-the vertical shaft 10.

Through the above described train of gearing the sprocket 55 is rotated continuously from the horizontal shaft K, driven from the main power-shaft D of the machine, and by engaging the clutch-member 50 with the sprocket 55 the spindle S may be rotated at the will of the operator. To

provide for shifting the clutch '50 into and out of engagement with the sprocket 55 a handle or lever Y is pivoted at y to theside of the headstock H, see Fig. 2, and carries a shoe 3 engaging an annular groove 65 formed in the periphery of the clutch in ac cordance with a well-known arrangement of such devices. To restrain the clutch 50 from unwarranted movement, after it has been shifted one way or the other, a yielding detent is provided comprising a springplunger 66 held in a pocket 67 in the spindle S, see Fig. 3. The plunger 66 is formed with a rounded end adapted to engage suit able recesses 68, 69 in the bore of the clutch 50 and is actuated by a coil-spring 70 held in the pocket 67 to press against its end. A cover H is applied over the bearings 33, 34 with its sides fitted to the standards 31, 32 to protect the gearing connected to the spindle S The method of operation of the complete machine is as follows: The piece to be finished or ground is attached to the faceplate or chuck carried at the end of the spindle S and a suitable size and shape of grindingwheel G is then applied to the spindle S in accordance with the character of work to be performed. F or straight work the adjustable table T is set with the spindle S parallel with the axis of the grindingwheel G, and in some cases in operating on relatively heavy pieces an auxiliary support or steady-rest may be employed, provision being made for attaching it to the top of the table T. F or operating on tapered surfaces the table T is adjusted to bring the work-spindle S at the required angle to the axis of the grinding-spindle S, this being accomplished. by loosening the bolts 25 and swinging it on its pivot U. During this adjustment the index X will be slid pastthe pointer 02 to indicate the degree of angularity of the spindle and after the proper setting is secured the bolts 25 are tightened again. For work having a considerable degree of taper, where the range of adjustment of the table T is not sufficient to secure the required angularity, then the headstock H is swung around on the same axis by loosening its bolts 20. Through this arrangement an extended range of angular adjustment capable. of meeting all requirements is provided, rendering the machine universally adaptable to a wide variety of work.

As before stated the whole machine is driven from the main drive-shaft D which carries a pulley D adapted to be belted to any suitable source of power,- such as an electriom-otor, preferably supported on the floor. The shaft D is connected in any suitable manner to rotate the pulley P, and the latter drives the grinding-spindle S" through the belt 79, the grinding-wheel G being rotated continuously thereby while fed against the work by hand or through the employment of suitable instrumentaliries operating on the slide or carriage C. The shaft D also drives the pinion O in alternately opposite directions through the means of the clutch and reversing-mechanism as usually provided, but not herein shown, and the slidingtable T is thereby reciprocated along the bed B to traverse the work-spindle back and forth relatively to the grindingwheel G. Meanwhile, the shaft K is driven continuously from the shaft D and its gear 2 is rotated therewith to drive the shaft 10 through the gear 9. The gear 14 at the upper end of the shaft 10 drives the pinion 60 onthe shaft 57 and its sprocket 61 transmit rotation through the chain 62 to the sprocket 55 on the spindle S. As before explained the sprocket 55 normally rotates free on the spindle S, and to connect the latter to be driven therefrom the clutch 50 is shifted into engagement with the teeth on the sprocket by operating the hand-lever Y. In this manner the spindle S is connected to be driven at the will of the operator, and as the table T is reciprocated back and forth along its ways thebevel-gear 2 slides on the shaft K while being maintained in operative" connection with the gear 9 by its bearing a. The spindle S is thus-caused to be driven to rotate the piece carried at its end while the work is traversed to and fro in relation to the grinding-wheel by the reciprocation of the table T.

It will be observed that my improvement provides a positive, direct drive from the main power-shaft of the machine to the work-support or spindle S, while permitting the longitudinal reciprocation of the work in relation to the grinding-wheel, and also al l'owingfor angular adjustment of the spindle relatively to the axis of the wheel. It isalso to be noted that all of the' several. op erating elements of the machine are driven from a single, main drive-shaft, with the driving-connections entirely inclosed to protest them from dirt and dust and to prevent the liability of injury to the operator from exposed gearing. Furthermore, the main power-shaft D of the machine may be driven from a single prime mover, such as an electric motor mounted. in convenient position on the floor, without the use of overhead shafting and multiple belts. Heretofore it has usually been the practice to drive the separate spindles of the machine individually from overhead countershafts requiring numerous pulleys, relatively long belts, and a complexity of apparatus which cut off the light and otherwise tended to hamper the adjustment and control of the work. With the present, improved construction all of the work-performing parts are left clearly exposed and accessible to the operator while the driving-mechanism itself is compacted and inclosed within the frame, thereby affording protection against accident or injury while improving the appearance and increasing the efficiency of the whole ma chine. In addition, my new arrangement provides for more accurate and expeditious setting of the work in the machine, while allowing a wider range of adjustment thereof, thus rendering it more universally adaptable to different requirements and increasing its efficiency and productiveness.

it is to be understood that I do not herein limit myself to the exact construction and arrangement of the parts of the invention as shown and described. If preferred, for instance, the relation of the work-support and grinding spindles might be reversed, the imp-reved driving-connections being applied to the grii'iding-wheel while adapting this element for angular adjustment instead of the headstock. Various other modifications might be made in the manner of applying the improvements to the machine without departing from the spirit or scooeof the in vention; therefore, withoutlimiting myself to the precise embodiment herein disclosed, whatl claim is 1. In a grinding-machine, the combina tion with a reciprocating table, of means to reciprocate said table, a headstock swiveled on said table to: adapt it to be adjusted in angular relation to the table, a rotary-memher mounted on the headstock, a longitudinal drive-shaft and a train of gearing connecting the rotary-member to be driven from the drive-shaft in its different positions of angular adjustment in relation thereto while being reciprocated with the table.

2. In a grinding-machine. the combination with a traveling table, of means totravel the table, a rotary work-driver carried by the table and adjustable in angular relation to its path of travel, a drive-shaft journaled in fixed relation with respect to the table, and a train of gearing slidable with respect to the drive-shaft and connecting the work-- driver to be driven therefrom in its different positions of angular adjustment in relation thereto.

8. In a grinding-machine, the combination with areciprocating table, of means to reciprocate said table, a rotary work-driver journaled in a bearing swiveled on the table, a drive-shaft journaled in hearings in fixed relation with respect to the table, and gearing slidable with respect to the drive-shaft and connecting said shaft to transmit motion to the work-driver during its reciprocation with the table when the work-driver is set in different positions of angular adjustment in relation to the table.

4. In a grinding-machine, the combination with a reciprocating table, of means to reciprocate said table, a headstock swiveled on said table, a work-driver mounted on the headstock to adapt it for angular adjustment in relation to the table, a longitudinal drive-shaft, and gearing connecting the drive-shaft to transmit motion to the work-driver in its different positions of angular adjustment in relation to the table, said gearing and drive-shaft being slidable one with respect to the other to provide for the reciprocation of the work-driver with the table. 7

5. In a grinding-machine, the combination with a grinding wheel of a traveling work-table, means to travel said work-table, a headstock swiveled on the table to adapt it to be adjusted laterally in angular relation to the table, a rotary work-driver on the headstock, a longitudinal driveshaft mounted in fixed position in relation to the table, and a train of gearing for transmitting motion from the drive-shaft to the work-driver in all positions of angular adjustment of the headstock in relation to the table.

6. In a grinding-machine, the combination with a traveling work-table, of means to travel said table, a headstock swiveled on the table to adapt it for angular adjustment in relation to the path of movement of the table, a spindle journaled in hearings on the headstock, a drive-shaft journaled in bearings in fixed position in relation to the table, and gearing connecting the spindle to be driven from the drive-shaft during the travel of the table, said gearing providing for driving the spindle in its different positions of angular adjustment in relation to its path of movement.

7 In a grinding-machine, the combination with the frame thereof, of a table slidable thereon, means to reciprocatethe table, a headstock swiveled on the table to adapt it to be adjusted in angular relation thereto, a spindle journaled in bearings on the headstock, a horizontal drive-shaft iournaled in hearings on the frame, and gearing connectingsaid shaft with the spindle to drive the latter while adapting it to be adjusted with the headstock and to be reciprocated with the table.

8. In a grinding-machine, the combination with the frame thereof, of a table slidable thereon, means to reciprocate the table, a worlesupport rotatably mounted in a swiveled bearing on the table to adapt it to be angularly adjusted on a vertical axis, a vertical shaft extending through bearings in the table and geared to the work-support, a horizontal drive-shaft journaled in bearings on the frame, and a gear keyed to said driveshaft and slidable therealong to drive the vertical shaft during its reciprocation with the table.

9. In a grinding-machine, the combination with the frame thereof, of a table slidable thereon, means to reciprocate the table, a spindle journaled in a bearing swiveled on the table, a vertical shaft also journaled in hearings on. the table, gearing connecting said shaft to drive the spindle, a horizontal drive-shaft journaled in bearings on the frame, and a gear j ournaled in a bearing on the table to drive the vertical shaft while adapting it to slide longitudinally of the horizontal drive-shaft to be rotatedtherefrom during the reciprocation of the table.

10. In a grinding-machine, the combination with the frame thereof, of a table reciprocably mounted on the frame, a headstock swiveled on the table means to reciprocate the table, a work-support rotatably mounted on the headstock, a vertical shaft geared to the work-support to drive the latter, a bevelgear at the lower end of said shaft, a horizontal drive-shaft journaled in hearings on the frame, and a second bevel-gear keyed to the drive-shaft and slidable therealong to adapt it to drive the vertical shaft during the reciprocation of the latter with the headstock.

11. In a grinding-machine, the combination with the frame thereof, of a table reciprocably mounted on the frame, means to reciprocate the table, a second angularly-adjustable table supported on the first table to reciprocate therewith, a work-support journaled in bearings on the adjustable table, a horizontal drive-shaft journaled in bearings on the frame, a vertical shaft journaled in abearing fastened to the first table to serve as a pivot for the second table, gearing connecting said shaft with the worksupport, and gearing connecting the vertical shaft with the drive-shaft to adapt it to be reciprocated therealong during the traverse of the tables.

12. In a grinding-machine, the combination with the frame thereof, of a table slidablv mounted thereon, means to reciprocate said table, a second angularly-adjustable table swiveled on a vertical axis on the first table, a vertical shaft extending through a bearing common to both tables with its axis coincident with the pivotal axis of the ad just-able table, a spindle journaled in bear.- ings on'the adjustable table, gearing connecting said spindle with the vertical'shaft, a horizontal drive-shaft journaled in bear.- ings on the main frame, and gearing con necting the vertical shaft with the driveshaft while being slidable therealong to pro vide for the reciprocation of the tables.

13. In a grinding-machine, the combination with the frame thereof, of a table slid? ably mounted thereon, means to reciprocate said table, a bearing extending vertically through said table, a second table swive ed on said bearing to adapt it for angular adjustment on the axis thereof, a vertical shaft jonrnaled in said bearing, a work-support rotatably mounted on the adjustable table, gearing connecting said work-support to be driven from the vertical shaft, a horizontal drive-shaft jonrnaled in bearings on the machine-frame, and gearing connecting the vertical shaft to be driven from the driveshaft while slidable therealong.

14. In grinding-machine, the combination with the frame thereof, of a table slidable thereon, means to reciprocate said table, a second table mounted to swivel on a vertical axis on the first table, a headstock pivotally mounted on the second table to swivel on the same axis therewith, a spindle journaled in bearings on the headstock, a vertical shaft extending through both tables with its axis coincident with the pivotal axis of the headstock, gearing connecting said shaft to drive the spindle, a horizontal drive-shaft journaled in hearings on the machine-frame beneath the table, and gearing slidable therealong and connected to drive the vertical shaft.

15. In a gririding-Tmachine,- the combination with the frame thereof, of a table slidable thereon, means to reciprocate said table, a headstockswiveled on a vertical axis on the table, a spindle journaled in hearings on said headstock, a bearingrsleeve concentric with the vertical axis of the headstock, a shaft journaled in said sleeve, gearing connecting said shaft to drive the spindle, a gear at the lower end of said shaft, a horizontal drive-shaft journaled in hearings on the frame, and agear journaled at the lower end of the bearing-sleeve to meshwith the gear on the vertical shaft while adapting it to slide on the drive-shaft during its rota tion therewith. Y

16. In a grinding-machine, the combination with the frame thereof, of a table slidable on ways on the frame, means to reciprocate said table, a bearing-sleeve carried by the table in vertical position thereon, a second table swiveled on said bearing-sleeve to adapt it for angular adjustment in relation to the first table, a splndle journaled in bearings on the adju stablestable, a vertical shaft journaled in the bearingrsleeve, gearing con necting said shaft to drive the spindle, a gear on the lower end of the vertical shaft, a horizontal drive-shaftjournaled in bearings on the frame, and a gear journaled on the earing-sleeve to drive the vertical shaft,

said gear slidable on the drive-shaft to be otated therewith during the reciprocation of the table.

17. In a grinding-n:1.achine, the combination with the frame thereof, of a horizontal drivershaft journaled in hearings on the terior of the frame, a table slidahlc on the frame above said shaft, a gear slidable on the drive-shaft while being rotated thereby, a bearing for said gear carried by the table, a vertical shaft journaled in hearings on the table, a gear connecting said shaf to be driven from the gear on the drivefshaft, a headstock swiveled on the axis of the vertical shaft, av spindle jcnrnaled in bearings on the headstock, and getting connecting the spindle to be driven from the vertical shaft.

18. In a grinding-machine, the combination with the. frame thereof, of a power-shaft journaled in hearings on the frame, a grinding-spindle journniled in hearings on the top of the frame and connected. to be driven from the power-shaft, a horizontal driveshaft journaled inbearings between the sides of the frame and also connected to be driven from the power shaft, a table slidable on the frame, means operated from the p0wer-shaft to reciprocate the table, a train of gearing carried by the table to be driven from the drivesha ft during its traverse longitudinally thereof, and a rotatable work support journaled on the table and connected to be driven by the gearing carried thereby.

19. In a grinding-machine, the combination with the frame thereof, of a table slidable thereon, means to-reciprocate said table,

second table angularly adjustable on the first table, a spindle journaled in hearings on the second table to provide for its angular adjustment therewith, ahorizcntal drive shaft journaled in hearings on the frame,

a train of gearing carried by the first table to be driven from the drive-shaft whileslidable therealong, and manually-operable means'for connecting the gearing to drive the spindle during the traverse of the latter with the table.

20. In a grinding-machine, the combination with the frame thereof, of a table slidable thereon, a horizontal drive-shaft journaled in hearings on the frame beneath the table, gearcarried by the table to slide on the drive-shaft, a vertical shaft carried by the table to be driven from said gear, a headstock adjnstably mounted on the table, a cross-shaft jonrnaled in said headstock and connected to be driven from the vertical shaft, a spindle journaled in the headstock, sprockets on the cross-shaft and spindle, and

a drive-chain connecting said sprocket-s to drive the spindle.

21. In a grinding-machine, the combina tion with the frame thereof, of a. horizontal drive-shaft journaled in hearings on the frame, a table slidable on the frame above the drive-shaft, aheadstock adjustabl mounted on said table, a spindle journaled in hearings on the headstock, a clutch rotatable with the spindle, a sprocket free to rotate on the spindle, a second sprocket, a chain connecting said sprockets, a vertical shaft carried by the table, gearing connecting said vertical shaft to be driven from the drive-shaft, gearing connecting the vertical shaft to drive the sprockets, and manuallycontrolled means for operating the clutch. to connect the spindle to be driven from the sprockets.

22. In a grinding-machine, the combination with the frame thereof, of a fixed hearing on said frame, a drive-shaft journaled at one end in said bearing, a second adjustable bearing for the opposite end of the shaft, means to support said second hearing on the frame to adapt it to be adjusted vertically and horizontally with respect to the fixed bearing, a table slidable on the top of the frame, a spindle jo rnaled in bearings on the table, and a train of gearing carried by the table and connecting the spindle to be driven from the drive-shaft.

23. In a grinding-machine, the combination With the frame thereof, of a fixed shaftbearing thereon, a hub on the frame, a bushing in said hub having an eccentric bore, an adjustable shaft-bearing having a stud seated in the bore of the bushing, means to secure said bushing in its hub While allowing for its axial adjustment to regulate the lateral position of the bearing supported thereby, means to secure the bearing-stud in the bushing While providing for the vertical adjustment of the bearing, a drive-shaftjournaled at opposite ends in the fixed and adjustable bearings, a table slidable on the frame, a spindle journaled in bearings on the table, and gearing connecting the spindle to be driven from the drive-shaft.

In testimony whereof I my signature.

GEORGE W. LANT.

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