US1108779A - Surface-grinding machine. - Google Patents

Description

G. H.;"NRTON. SURFACE GEINDING MACHINE. ALPLIOATION .FILED JUNE 6,1913.

Patented Aug. 25;

6 SHEETS-SHEET 1.

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. G. 4Hi SURFACE GRINDING MAGHN APPLIOATION FILED JUNE 6,1913.

C. H. NORTON. SURFACE GRINDING MACHINE. APPLIUATIQN FILED JUNE 6,1913.

191897795 -Patented Aug. 25, 1914.

6 SHEETS-SHEET 3.

`G.HN0RT0N. SURFACE GRINDNG MACHINE. APPLIGATION FILED JUNE 6,1913.

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(LH. NORTON.

SURFACE GRINDING MACHINE.

APPLICATION MLBD JUNBG, 191s.

Patented Aug. 25,'l i914. v

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. GfH. NORTON. SURFACE GRINDING MACHINE.

APPLICATION FILED JUNE 6,*1913.

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Patented Aug. 25, 1914 6 SHEETS-SHEET 6.

.Il Il En srarns ign CHARLES H. NORTON, OF vWOIRCFSTIER, MASSACHUSETTS, ASSIGNOR TO NORTON GRIND- ING COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHU- SETTS.

ATo all whom t may concern.'

upon work of a great variety which will be capable of entire automatic operation, but yet in which the control by the operator can be regained instantaneously whenever desired; to provide improvements in the belt shifting mechanism, the reversing mechal nisni, the means for traversing the grii'idiiig wheel and for raising and loweringit, whereby the adjustments'fof theY machine can be varied accurately' and A'expeditiously for. the purpose `of changing the character of work, and'improvements in the form yandarlangement of the horizontal slide supports, so as to protect andrigidly carry the slide.

-The invention also involves improvements in` details of construction and combinations of parts as will appear hereinafter.

Reference is to be had to the accompany ing drawings, in which-#- Figure 1 is a `front View of a machine constructed in accordance Iwith this invention; Fig. 2is a.rear View thereof; Figf?) is an end view thereof; Fig. l is a plan View of the driving and belt shifting mechanism;

.F ig. 5 is side View of the belt shifting mechanism; Fig.,6,is a front view of the reversing mechanism; IF ig. 7 is a sectionalview of the same; Figs. 8 and 9 are details of the same; Fig. 10 is a sectional View of the mechanism for raising and lowering the wheel mechanism; Fig. 1.1 is-a front View of the same; Fig. 12-is a'plan showing the arrangement for connecting the motor to raise the' wheel mechanism; Fig. 13 is a'front view of part of the same; Figs. 14 and. 15 are Aviews similar to Figs. 12 and 1 3 respectively, with the parts in another position; Fig. .16 is a front elevation of the wheel traverse mechanism; and Fig.- 17 is a .plan thereof,

Specification of Letters Patent. Patuted tug- 25 191@ Application filed .Tune 6, 1913. Serial No` 772.054.

The machine shown in the first three figures comprises a mam bed 2 carried by rsupports 3, each consisting of a wedge having ears et extending up therefrom and carrying the bed itself upon these wedges. vThe ears are provided with adjusting bolts 5 by which the wedges may be moved to secure perfect adjustment of the bed. The ways 7 formed on the bed carry the sliding table 8. Rising from the bed is a separate casting or standard 9 supporting many parts of the mechanism.

The n'iain parts of the machine are driven from a motor A which transmits power by a belt 10 to a counter shaft 11 arranged transversely in bearings in the bed. y Located on this` shaft is a wide-faced pulley 12 (Fig. a) for operating the sliding table and reversing mechanism, a pulley 13 for operating the grinding wheel mechanism, and a pulley L1 for operating the.. pump, Ias will appear hereinafter.

On the pulley 12 are straight and cross belts operating loose pulleys 15 and 1G and a tight pulley 17 on a shaft 18 (see Figs. 4L and 5). This shaft 18 is located below the top of the rear of the bed but beyond the shaft 11. 0n the shaft 18 is a worm 19 meshing with a woringear 2O fast to a longitudinal quill 200 located in bearingsvon a casing 201 in the bed.` Through the quill passesa shaft 202 on the ends lof which are keyed dash pots 21a having air `passages 203 regulated by screws 204. Fixed to one of the dash pots and-therefore to the shaft 202 is a shaft 21 havinga worm 22 meshing with a worm gear 23 on a transverse shaft 24 (Fig. 7). This shaft isprovided with a bul-l. gear 25. .lVith this construction, thev -tacts-with' the end of the cylinder and the 'parts operate asif rigidly connected. lBy

this arrangement the speed of operation iS positely extending arms 28a connected with l it at that point. lThese arms have handles extending along about the-level of theways, by which the operator can manipulate it by hand either in emergency or in cases in which the travel is too small to permit the use of the dogs for controling' it. -Atthe bottom this lever 2 engages with a sleeve 31 mounted on a rod 32 which reciproeates` in bearings in a casing 33 onl the apron, and

which carries a slider 34, as shown in Fig. 6. Arranged between collars 35 engaging the ends of the slider 34 and loose' on saidl rod 32 aresprings 36. .'A projection 37 is provvided on the slider 34 in position tf1-'engage the sleeve 31 to operate lthe springs 36. The

slider is provided at its ends with catches 38, and latches 39'are pivoted to the apron` 29 to cooperate with said catches. The ends of said latches are turned up or formed in cam shape. A ioating or shifting lever 40 isprovided with a slot which receivesV thefpivot' bolt 41 of the lever 28, and another :slot at thebottom which receivesva pin 400 in the lever 28, and it lies over a plate 42 fffixed4co the lever' 28. -This plate has sockets 42a 'for a spring settingpin 43 on the end of the lever 40. Thus the floating lever can be set in an upperand in a lower Position. This lever is provided with outwardlyA 40 'extending arms 44 at the bottom, which are provided with studs or rolls' 45 which engage under the projecting ends of the latches 39. When the lever40 is in its highest position, it prevents the operation of both eration4 of the reversing mechanism. en

in its low yposition vwith theleft hand latch 39 holding its catch 38, thesliding table 8l v can move to the left until the upper end of the lever 28 is engaged bythe right-' hand reversing dog 30. As this actiontakes place, the'lower end of the lever 28 will:v be swung to the right, which will put the' rightfhand spring 36under heavy compression and as this swinging of'the lower end of the lever 28 continues"Ik the lower end thereof will finally engage ithe Acam-shaped end of the right-hand latgh39 and will lift the same free of its `catch 38. The

v right-hand spring 36 will nbw throw the slider 34 to the right, which will cause the left-hand catch 38 to engage under the lefthand latch 39. This movement of the slider 34 to the right will rock the lower 'ed of the shifting lever 40 to the right, which.

ways. ways andslide are-'protected by the nood-`1o5 latches'39 and, therefore, the automatic op' will throw the belt shifter rod 32 to reve-rse the motion of the work tableas will appear hereinafter. Thus the motion will be automatically reversed a't the position 'determined by the right-hand reversing dog 30. The work table will now move to, the left and when the4 upper end of the lever 28 engages the left-hand reversing dog 30, the motion of. the work table 8 will be reversed automatically at its left-hand eXtreme of travel.

A lo-ck for the reversing lever is shown inFigs. 6 and 9 as comprising a plate 46 having a notch 47 at the center for receiving the lever, andv provided with an arm 48180 for turning it on its own pivot. It is pivoted,` in brackets on the bed.

The way in which the'l'rod 32 shifts the belt is very simple. It is connected by a bell crank 49 (Fig. 4) to another rod50 85 whichis connected with avsliding carriage 51. This has groovedwheels 52 (Fig. 5) arranged in pairs thereon and running be-` n tween a pairofstationary parallel rods 53 f constituting traclrstherefor. The carriage 9n is'provided with belt guides 54 for the two 'beltsf The "carriage 51 is supported bj' brackets 56 mountedoneboxes 57 inwhich k.the-shaft 18 is supported.

The standard or housing 9 is providedfe with vertical ways 60 on which operates a vertical slide V 61' having a horizontal hood n 62 cast' there'ox'i.v 'Thisfhood is substantially v.semi-cylindrical on top and h\as a flat bottom providedwit'h"downwardly 'extending 100 projections having 'horizontalways 63 (Fig.

16) at the bottom on their inner faces. Thel horizontal wheel slide `64 is carried by the Thus the wearing surfaces ofV the from the 'lodgment thereon of metal filings, chips` epd the' like.` This adds materially`- to "tllective life'of these parts. Also on account of the shapeof the hood' it furnishes a rigid Support foi-"both sides ofthe-slide. .110

' This'is provided with'downwardly` extendf On vthe bottom of the slide 61 are down-*115.

wardly extending 'brackets 68, at the bottom of-whichis pivoted'l ai support 69 having bearings 70 thereon y'for the horizontal shaft of a wide faced pulley 71. -The other side of this support69 is supported from above 120 shaft .66. An idler 80 is shown supported from one of the brackets G5 for providing sutficient wrap around the pulley 79. This arrangement is provided so as to allow for the\vertical and horizontal motion of the grinding wheel Shaft which'will be described hereinafter. From the pulley 14 a belt 81 (Fig. 2) extends over a pair of idleisgone of which, 82 is adjustable, and a pulley 83 on a vertical shaft 84. The lower end of vthis shaft is connected with va pumpY (not shown) mounted in a tank 85. This tank is mounted oiirollers and can be moved out and in under' a part of the bed of the niachine. 1t is provided with a recess on the rear to clear the end of the shaft 18 and connected parts when the tank is pushed in to its extreme position. The pump delivers a stream of Water from this tank through a flexible hose 80 toa pipe 87 (Fig. 3') and through a nozzle 88 (Fig. 16) under the grinding wheel 67 and in contact with the work D on which it operates.

The work, it is to be understood, is supported on a work table 90 (Fig. 7) which is v fixed to the sliding table 8,.the work table being provided with the `usual T-slots for securing the work. The work table is providedwith upwardly extending side ianges 91 and with an elevated end fiange 92 (Figs.

1 and .2) for preventing the splashing over of the water on the parts below and also for providing a trough 93 (Fig. 7) at each side of` the work LAtable for collecting the-water. This Water then drains down 'through an outlet 94 (Fig. 2) on the rear of the work table into an open trough 95 extending along the side of the bed. This drains :through an outlet 90a into the top of lthe the back of the slide.

vconnected parts thereof.

tank. The ways on which the sliding table moves are protected from the water by plates 96 (Fig. 7) securedthereon andv extending inwardly therefrom. VJhen it is desired to repair the pump or get at the parts of the tank, the latter is drawn out to the rear in Fig.' 27 after the belt 81 .is either diseon nected or loosened by moving the idler 82. This also exposes the-'end of the shaft 18 and screw is a bevel gear 101 (Fig. 10)'in a casing 102. Extending down from this casing is an integral branch casing 103.in which is a shaft 104 geared to the gear-*101 and At the top of this meshing with a gear 106. This gear isy locatedon a shaft 107 supported at one end in la bearing `on an extension of the casing 108 and provided with an end washer 99 and adjusting screw 99a. This gear 106 is loosely mounted on the shaft 107 and is provided with along hub 108 to which is keyed the hub of a gear casing 100. This casing has an external gear 110 on the back thereof and an internal gear 111 on the front. the end of the hub 108 are washers 112, and beyond them is a plate 118 keyed to the shaft 107. Beyond that is a hand wheel 114 loose on the shaft. At the end of the shaft there is a screw 115 provided with a handle 119 adapted to be moved up on the screw against a washer on the ond of the hand wheel 114. Thehand wheel is provided with an operating handle 121.

Mounted on the hand wheel 114 is ashaft 122 having a pinion 123 thereon meshing with the internal gear 111. lVith this shaft is connected a handle 124 .having a spring pin 125`opc'ratiiig over an index plate 12o fixed on the hand wheel 114. lVheii the locking-pin 124 is in o ne of the holes of the index plate, the rot-ation of the hand wheel 114 byits handle 121 will cause theshaft 107 and gear 106 to rotate with it. This also, of course, carries'the gear casing 109 andconnected parts. The handle 124 can be operated to turn the internal gear 111 slowly and "adjust the angularity of the several shafts 107 104 and 100, thus securinga fincadjustment ofthe height of the vertical slide 61.

y For the purposeof operating the vertical slide by power when desired, a motor C is shown iii Fig. 12. The shaft of thisl motor is connected by a friction device controlled -by a lever 181 with a bevel gear 132 which drivesa shaft 183.V On this shaft is slidably having on the other .end thereof a gear 105 l mounted a` pinion 184 adapted in one position to inesh withv the external gear 110.'

to entera hole (Fig. '18) in the stationary casing in which these parts are located. When in 'this hole, as shown in Figs. .1VI f and 13, the 'pinion 184 is held in its position out of -niesh with the gear 110. ln this posi-- tion a tooth 147 rigidly connected with the `frame comes in position against a. pin 141 on a member 142 which swings about pivot 143 on the stationary frame. r1 spring 144 (Fig. 12) normally holds this pivot member inthe positionvshown in these fig.- ures. It is provided with'a head or button i'o with the gear 110. The position of the parts 100 and vraise -or lower the vertical slide, or

-the rack ,640 of the wheel slide. Loose on 14:1 by, which it can be turned on its pivot so as to bring the pin -1,41 up into the position shown in Fig. 14; out of the way of the tooth 147 and also out of the path of a stud 5 lil-6 on the hand wheel 114. Therefore, in ,this position, the hand wheel can be turned in both directions if desired, and also the vhandle 1.36can be moved back and"forth to 'l cause the pinion to. come into or out of mesh ,when in this position is shown most clearly in Figs. 14 and 15. In this position the motor rcan be `used by the manipulation of the handle 131 to positively rotate the screw on the other hand, withthe parte still in this position, the hand wheel 114: can be used when the friction device 130 is olfv to raise and lowerthe slide. But when the parts are in the position shown in Fig. 12 the pinion can not be moved into mesh with the gear and not only tliat,.,but the hand wheel 114 can be moved in only one direction after the pin 146 engages the member 142, that is, the direction to raise the slide.

For the purpose of reciprocatingvtheewheels i slide longitudinally with vrespect to the wheel shaft, the following mechanism is provided: The horizontal hood 62 (Figs. 16 and 17) is provided with a bracket 150 supporting a casino` 1.51. This .casing supports a shaft 152 on which is keyed an operating hand wheel 153. On the opposite end a bevel'gear 154 iesheswith a bevel gear 155 on a shaft 156. On the shaft'l56 is a geari157 meshing with shaft 152 is -a worin gear158 meshing Awith a .worm 159 on'a shaft 160 operated by an- -other hand wheel 161. -O-n each side of the 40 worm gear` 158 are flanged collars 162. Both of these collars are keyed to thejshaft 152,

the right-li'andcollar, as viewed in Fig.` 17,

being fixed to the shaft, and the .left-hand collar being slidable thereon. A tightening nut '163 is provided foi` moving the slidable collar longitudinally to grip the worm wheel 158 so that the shaft 152 can be opei'ated by the hand wheel 161. This'constitutes the wheel traverse mechanism.

Thus, by the mechanism described, the opera-tor canadj ust the grinding wheel slide transversely with regard Vto the work, by

' hand eitherrapidly or slowly; can cause the vertical slide to move vertically by power;

'can set the parts so that the same can be operated by hand 'at two speeds; or can throw in mechanism which will cause the work table to travel forward and backward automaticallywithin the limits determined by the adjustment of the two reversing dogs. It will be seen, also, that by the connections described, it is possible'for the operatorto control the feed movement entirely by hand,

`irrespective of the automatic reversing mechanism.

The cushioning device for relieving the vreversal strain-and the improved structure for supportingV the wheel slide are not claimedl in this application, these features constituting the subject matter of certain divisional applications led by me. y

Although I have illustrated and describe a single form of. theinvention 'and have shown it as applied to a single type of machine, I am aware of the fact that many modifications can be made therein without departing from thescope of the invention as expressed in the claims. Therefore, I do not wish to be limited in these respects, but

1. In a grinding machine, the-combination with a base, o a screw connected there-l with, a slide connected with the screw to be moved thereby and havingmeans for sup.- J porting a grinding wheel, a shaft carried by said base, agear loose on the shaft, means for connecting said gear with said'screw for rotating the screw, a .gear fixed with respect to the first named gear, a shaft providedV with' a pinion thereon meshinp with Said 9o lastnamed gear, and means i; col i. Lnelastnamed shaft and pinion 'for giving the pinion a lplanatory motion and rotating the gears.

2.` In a grinding machine, the combinationwith the base, of a vertical screw, a slide connected with said screw to be moved ver-- tically thereby and having means for sup# porting a grinding wheel, ashaft, 'a gear loose on said. sha t, means for constantly connecting said gear to said screw for ro-. tating the screw, a hand wheel loose on said: shaft, a gear fixed to -the-hub of the first `'named gear, a shaft onsaid hand wheel having a pinion thereon meshingwith the last named gear, and means fixed to the' last named shaft and pinion and mounted on the hand wheel for rotating Ithe pinion and gears. 'Q

3. In a grindingmachine, the combina# tion with the base, of a vertical screw,'a slide connected with said screw to be moved vertically thereby and, having means for supporting a grinding wheel, a' shaft, a gear loose on said shaft, means for constantly .connecting said gear to said screw for rotating the screw, a hand wheel loose on said shaft, a gear fixed to the hub of the rst named gear, a shaft on said hand wheel hav?. ing apinion thereon meshing with the last named gear, an index platexed on the hand wheel, an index armxedtothe shaft and rotatable along the plate, and a springpressed pin on said arm forengaging in the ate. p/l. In a grinding machine, the combination Awiththe bed and a verticallyhmovable slide, means for raising'and lowering the slide, a gear constantly connected with said' ,means for operating it, -a shaft 'on which.' v130 I the gear.

Licentie said gea-ris rotatably mounted, an internal gear fixed to the first named gear, a hand wheel rotatably mounted on said shaft, an index mechanism on the hand wheel having a pinion meshing with the internal gear, a plate keyed to said shaft and adjacent to said hand wheel, and means for clamping the hand wheel to said plate.

` 5. In a. grinding machine, thel combination with the bed, of a slide, means for raising and lowering the slide, a gear constantly connected with said means for 4operating it, a shaft on which said gear `is rotatably mounted, an internal gear'fixed to the first named gear, a hand wheel rotatably mounted on said shaft, an index mechanism on the hand wheel-,having a pinion meshing with the internal gear,l a plate keyed to said shaftl and adjacent to said hand wheel` means for clamping the 'hand wheel tosai'd plate, an

external gear fixed with respect to said internal gear, a motor, a shaft adapted to be connected with the motor, a pinion slidably mounted on said shaft for meshing with said external gear, whereby the slide can be opera ted by the motor, and means for preventing the last named pinion from being moved into engagement with its gear.

6. In a grinding machine, the combina tion with the bed, of a slide,'means for raising and lowering the slide, a `gear constantly connected with said means for operating it, a shaft on which said gear is rotatably mounted, a gear, a-motor, a shaft adapted to be connected with the motor, a pinion slidably mounted on said shaft for meshing.

with said gear, whereby the slide can be operated by the motor, and means for preventing the pinlon from being moved into engagement with its gear.

7. In a grinding machine, the combination of a bed, of a slide movable up and down, a gear constantly connected with said slide for moving it, a shaft adjacent to said gear, a pinion slidably mounted on said shaft for meshing with said gear, a 'frame in which said pinion is supported. having a handle for moving the pinion along the shaft, and means for locking said frame in.

a position in which the pinion meshes with 8. In a grinding machine, the combination of a bed, of a slide movable up' and down, a gear constantly connected with said slide for moving it, a shaft adjacent to said gear, a pinion slidably mounted on said shaft for Ameshing with saidfgear, a. frame in which said pinion isA supported, having a handle for moving the pinion along the shaft, a projection on said frame, and a pivoted member having a' pin adapted to engage said projection and prevent the movement of the frame along the shaft toward the gear when said member is in one extreme position.

verating the wheel'slide rapidly and the 9. In agrinding machine, the combination of a'bed, of a slide movable up and down, a gear constantly connected with said slide for moving it, a shaft adjacent to said gear, 'a pinion slidably mounted on said shaft for 70 meshing with said gear, a slidable framein which -saidpinion is supported having a projection, aA pivoted member having a pin adapted to engage said projection and pre-y vent the movement of theframe along the shaft toward lthe gear when saidmember is in one' extreme position, said pin being in a position to move beyond theprojec tion when the member is swung into its other extreme position,` a hand wheel for ,operating said slide independently of said pin, and a stop pin on 'they hand wheel in position to engage said member when in its first named'position.

l0.v In a grinding machine, the combination with .the bed, of a slidev mounted to move vertically, a motor, means for con- 'ne'.cting the motor with the slide for operating it, hand wheel, 'an adjusting device on the hand wheel, 'means for connecting at) 4said-hand wheel and adjusting device with the slide for operating it by lhand'either slowly or rapidly, said' slide having hori-l zontalways, two hand wheels, one for opother for adjusting-rit, and means for Iconnecting said hand wheels with the'wheel /slide 11. In a grinding'machine, the combina- 4tion with the bed, of a slide mounted to 100 move vertically, a motor, meansfor con'- necting the motor with the slide for operating it, 'a hand wheel, an adjusting device on the hand wheel, means for connecting ysaid hand wheel'and adjusting device with 105 the slide for operating it by hand either slowly o r rapidly, said slide having horizontal ways thereon, a wheel slide mounted to move in said horizontal ways, said wheel slide having a rack, a pinion meshingwith -said rack for operating it, a shaft supported by said vertical slide for operating the pinion, and twohandY wheels -connected with said shaft, one for rotatin the pinion rap'- ,idly and the other for adjusting it,

12. In a grinding machine, the combination'withl the bed, -of a vertically movable slide having horizontal ways thereon, a wheel slide mounted to move in said ways,

a shaft having a worm thereon suppe-ted by said vertical slide, a worm wheel meshing with the worm, a shaft on whiehsaid worm wheel is mounted, means for fixing said Worm wheel to the shaft, a hand wheel'y on the end vof the shaft Iforoperating said shaft independently of the wormrwheel, and means connected with the shaft fomoving f said slide. l

13. In a grinding machine, the' combination of a recipro'cable` slide, a shaft for op- 130 connected with'said hand Wheel for 'fixing the worm Wheel to the shaft and disconnecting it therefrom at will, whereby the slide c'an bemoved by either of said shafts. lhlna grinding machine, the combination., of ja' shaft, a. Worm wheel loosely mounted thereon, a pair ofA plate's keyed to said shaft .onopposite sides Aof thel hand Wheel, a nuten saidshaft for forcing one of said Tplates toward the other and clamping the Wormwh'eel between them, whereby the Worm Wheel will be fixed with respect to the shaft, a Wormy meshinv with said Worm Wheelfor operating it', a slide for carryingia grinding', Wheel, and means noonpulley. shaft mounted' in bearings on saidl support, a belt for connecting the counter shaft .for keeping the. belt tight, a pulley on said grinding Wheel shaft, and a belt connecting the pulley shaft with the grindingvvheel shaft.

16. In a grinding machine, the combina- .tion With the bed, of a vertically movable slide supported thereby, a horizontally movable slide' carried by the vertical slide, a grinding wheel'shaft movable with the horizontal 'slide and vhaving. a pulleyv thereon, amovablesupport connected with the vertically lmovable slide, adjustable means for holding 'said support up, a pulley shaft carriedby said support, a long-faced pulley on said pulleyl shaft, a belt extending from sai-d long-faced pulley to the pulley on the grinding wheel shaft, and means supported by the bed lfor driving said pulley shaft in all positions of the vertical slide.

17. In a grinding machine, the combination With the bed, of a vertically "movable slide supported thereby, a` horizontally movable slide carried by the verticalj slide, a

grinding wheel shaft movable with the horizontal Islide and having a pulley thereon, a

movable support connected with the vertical-ly movable slide, yielding means Ifor hold- 'ing saidsupport up, a, pulleyfshaft carried by said support, a long-faced pulley on 'said pulley shaft, a belt. extendingA from said long-faced pulley to the pulley on the grind" ing wheel shaft, a counter-shaft carriedy inl nected with said shaft for reciprocating the slide. i

15. In a Igrinding machine, the combinaside the bed, 'a bel't'extendin'g from the coun. ter .shaftf'to the pulley'shaft, and a, movable moat/7e l.

beltitightener for said pulley having idlers for .the two strands of the belt and provided With a Weight and having a link pivoted tov it and to saidigpounter-shaft.

l' y18. In a grinding machine, the combination'of a vertically movable slide, a grinding'l wheel vshaft movable with the slide and having Va pulley thereon, a movable support connected with the vertically movable slide,

yielding means for holding saidsupport up,

arpulley shaft carried by said support, a pulley on said pulley shaft, a belt extending from said pulley to the pulley on the grinding Wheel shaft, a counter-shaft, va belt eX- tending from the counter shaft to the pulley shaft, and a movable belt tightenerfor said pulley having idlers for the two strands of the belt and provided witha Weight.

' '19. Ina `grinding-machine; the combination of a vertically movable slide, a support pivoted to said slide and extending loutwardly. therefrom, a rodadjustably connectedwith said slide at a point abovethe support, a spring for connectingisaid rod yield'- ingly with the outer end of said support, a shaft journaled on said support and having a long-faced pulley thereon, a horizontal slide movable parallel with said shaft upon said vertical slide, a'grinding wheel shaft carried by the horizontal slide and movable therewith 'and 'having a pulley thereonfand a'belt connecting the pulley on the. grinding shaft with the long-faced pul-` ley.

naledy on saidl bed and located within it, a vertically and horizontally movable grinding Wheel shaft, means connected'with the counter-shaft for driving said grinding Wheel shaft in all p'ositionsth'ereof both `horizontally and vertically, a shaft in the bed parallel with the counter-shaft having tight and loose pulleys thereon, belts connecting the counter-shaft with thel latter shaft, a sliding table on 4the bed, vand a bull :20. 'In a grinding machine, the combina-` tion with' the bed, of a counter-shaft jourgear operated by said transverse shaft for reciprocating said table.

,21. In a 'grinding machine, the combination with the bed, of'a 4counter-shaft journaled on 'said bed, a grinding .wheel shaft, means connected withy the counter-shaft for driving said grinding wheel shaft, a shaft in the bed'having" tight andsloosefpulleys thereon, belts' connecting ,the counter-shaft with the tight and'loose pulleys, a shaft' connected' with the latter shaft, "fa sliding table .on the bedpa'bull gearop'erated by the last' named vshaft for reciprocating said table," a reversin' mechanism mounted on the front of the ed',s and a belt shifter operated by said' reversing mechanism for shiftingsaidbelts. Y 22. ln 'agrinding machine, the combina- 'ftion of acounter-shaft, a movablev grinding A 1,108,779 l f7 wheel shaft7 means connected with the counln testimony whereof l have hereunto 'set ter-shaft for driving said -grinding Wheel In7 hand, in the presence of two subscribing shaft, a shaft having tight andloose pul- 'Witnesses leys Jchereon, belts Connecting Jche counter- CHARLES H. NORTON. 5 shaft with the tight and loose pulleys, and Witnesses:

/n belt shifter provided Withgudes for said FREDK C. BUTTERFIELD,

. J. HERBERT JOHNSAY.'

belts.

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