US1026610A - Grinding and like machine. - Google Patents

Description

A. A. SCOTT.

GRINDING AND LIKE MACHINE.

APPLIOATION FILED 530.18, 1911.

Patented May 14, 1912.

8 SHEETS-SHEET 1.

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FIGE.

A. A. SCOTT. GRINDING AND LIKE MACHINE. APPLICATION FILED D20; 18, 1911.v

Patented May 14, 1912.

A. A. SCOTT. GRINDING AND LIKE MACHINE. APPLICATION FILED 1330.18, 1911.

Patented May 14,1912

3 SEEETS-SHEET 3.

ALFRED ANGAS SCOTT, OF BRADFORD, ENGLAND GRINDING AND LIKE MACHINE.

Specification of Letters Patent.

Patented May 14, 1912.

Application filed December 18, 1911. Serial No. 663,380.

7 i; all whom.- ii In (W concern Be it known that l. ALI-nan Axons Sco'r'r. a subject of the King of (n-eat Britain. re siding at Bradford. Yorkshire. llngland, have invented certain new and useful [111- g provenn'nts in Grinding and Like achines; and l 'do hereby declare the following to be a full. 'clear and exact description of the 3 invention. such as will enable'ethers skilled in th* art to which it appertains to make and use the same.

lhis inventionielates to improvements in grinding machines and the like in which a rapidly rotating grinding disk or tool is; worked over the surface of a slowly rotating article such tor instanee as a cylinder of which it is desired to grind or finish the internal bore or other surface.

According to'the present invention the grinding or tool spindle is mounted eccentrically or ott'set in a quill or ri 'id tube, the quill being mounted in hearings in such a way that it can he turned about its own axis 7 to adjust the amount of eccentricity of the grinding spindle relative to the work-piece.

the quill being at the same timecapable of being traveled in a direction parallel to its axis to obtain the necessary traverse ot' the grinding instrument relative to the workpiece.

In the preferred form the grinding spin dle is mounted eccentricall "in the quill at the lower end oi the same while at the upper end there is a driving spindle mounted concentrieally inlthe quill and motion is iniparted from the driving spindle to the I grinding spindle Irv means of an internal connecting shaft with universal joint connections at each ehd.

The preferred form of nmchine is shown in detail in'the am-onipanymg drawings in which 2+ Figure l is a sectional side view of the machine. Fig. 2 is a front elevation. Fig. 3 is an enlarged sectional view of the quill. Fig. 4 is a seetion taken on the line [V-IV of Fig. '1 while Figs. 5 and (t are detail views in sectional elevation and plan view in par tial section respectively showing on an ens larged scale the means adopted for obtains ing the feed and traverse-of the grinding disk or tool.

As shown in the drawings the'quill 1 is ltlOllIltPtl in suitable hearings 2 on the body 3 of the machine. .\t the upper end of the quill 1 there is coln'entrieally mounted the driving spindles. The driving spindle 4 1s provided with a spline 5 so that; it can pass through the driving pulley 6 and be rotated by this pulley. The grinding spindle 7 eccentrically mounted in the quill 1 as shown more clearly in Figs. 2 and 3.

The lower end of the driving spindle 4 is mounted inball hearings 8 which take up i any thrust and is connected to the grinding spindle 7 so as to transmit its motion thereto by means of an internal connecting shaft 9.

This internal connecting shaft 9 is provided at each end with a universal joint lO to the driving spindle and grinding spindle respectivcly. vided into two parts which are connected The grinding spindle 7 is diby a helical spring 11 both parts of the grinding spindle being mounted in suitable ball bearings. The spring 11 forms a flexible connection between the two parts of the grinding spindle and so prevents any vibration being communicated from the connect-- ing shaft 9 tothe lower part of the grinding spindle. Suitably mounted between the two bearings 2 of the quill is a fixed guide rod l2 which is embraced between radially arranged jaws 13 which project from an annulus ll arranged about a boss or .fixcd sleeve 15 on the quill 1. Between the jaws 13 and the guide rod 12 there are arranged suitable bushes 16. it will be seen that the annulus It will be capable of sliding-along the guide rod but at the same time will be held against rotation with the quill owing to its jaw embracing the guide rod 12. Pivotally mouqted about the guide rod 19 and so as to embrace the jaws 13 there is mounted a swinging half nut 17 adapted to be adjusted by means of a suitable handle 18. Running parallel to the guide rod 12 and mounted in a footstep bearing in the lower bearing 2 there is a lead screw 19 which at its upper end bears in bearings 20 connected to the lwarings 9. This lead screw 19 is yonti'nuously rotated as hereinafter dcscribcd. 3

At the bottom of the boss or fined sleeve 15 on the quill there is cast a flange '21 having at one side a projection 22 on which .\lso mounted on the boss or sleeve 15 and between the flange 31 and the annulus H there is a-further annulus 27. The annnluses 14 and 2'1" are provided with projections 28 and 29 respectively. The projection 28 carries a swiveling eyelet 30 to which the end of the micrometer screw 31 is fixed. The projection 29 carries a swiveling nut 32 in which the threaded portion of the mieroiiiieter screw 31 engages from which it will be obvious that a very accurate relative adjljlSlTl'llGTill between the aunuluses 14 and 27 The annulus-27 has in it can be obtained. a circumferential groove in which the wedge like piece 26 can be caused to engage by turning the handle so as to lock when desired the annulus 27 to the boss iii and therefore to the quill.

From the foregoing arrangement it will be seen that For a quick adjustment of the eccentricity of the grinding disk or tool it will be possible to slacken the wed go 26 from the groove and then turn the handle 26 bodily about the axis of the quill 1 which action owing to the boss 15 being rigidly secured to the quill will cause the quill itself to be turned. On the desired adjustment beingapproximately obtained the handle can be screwed so as to lock the wedge 26 in the groove 33 so as to rigidly connect the annulus 27 to the boss 15. By then turning the micrometer screw 31 a finer and very accurate relative adjustment between the quill and the annulus 14 can be obtained. This annulus i4: is, as will be obvious, held rigidly against rotation owing to its jaws 13 embracing the guide rod 12. Onthe other hand as the jaws l3 carry the half nut 17 which engages with the lead screw 19 the annulus 'l-it will be raised or lowered according to the direction of rotation of the lead screw 19 when the half nut is engaging therewith and therefore the quill will also be correspondingly raised and lowered in its hearings 2. The half nut 17 is provided with a projecting portion 34 carrying an upstanding" pin 35 which as the half nut 17 is moved in and out of engagement with the-lead screw 19 engages against and slips past a syn-inc pressed nose 36 mounted in the annulus l! as shown in 5 and 6. The swinging portion carrying the half nut 17 also carries a projection 37 which when the half nut 17 is in engagement with the lead screw 1-0 lies between two'stops 38 moinited on a reversing rod 39 connected to a reversing gear hereinafter described. the

action oi. the projection 27 being toward the end of the desired amount of travel of the quill to come inloconlact with one or other of thestops 38 on the rever:-'in g' rod and so propel the same in the direction in which the quill is traveling and so operate the reversing gear and cl'lange the direction of rotation of the lead screw. The amount of travel imparted to the quill by the lead screw in each direction can be limited to the desired amount by the adjustment of the stops 38 on the reversing rod.3 9, this adjustment being rendered possible by means of the thumb screws 40 which are screwed into the steps 38 so as to engage with the rod 39.?

crank lever 45 mounted upon a suitablebracket 46 on the main body of'the machine. This bracket also carries a bearing for the shaft 44. On the bell crank lever 45 there is mounted a pin or roller 47 while normally pressed against this roller 47 there is a depending finger 48 provided with a nose or projection 49. The outer end of the depending finger 4.8 is connected by means of a suitable spring 50 to thebracket 4-6 so that the depending finger'is. normally held up against the roller 47. The bevel wheels 43 i and 42 are mounted on a sleeve 51 which is slidably mounted on the shaft 4.4 so as to be rotated by this latter. At the outer end of the sleeve 51 there are two annulnses' arm of the bell crank lever 45. Also hinged on the bracket 46 there is a small locking a bevel wheel 41 which is driven 52 while between these two annuluses there i 1s located a pin 53 mounted on the second device 54- which is provided with aprojection 55 which'engages with, on either side, one of the annuluses 52. so as to lock the sleeve- 51 in Whichever position It 1s placed to hold one or other of the'bevel wheels 42, 43

in operative connection with the bevel heel ll on the lead screw 19. The locking device 54: carries a small roller 56 which lies in the path of the upstanding end'of the bell crank 45. In this case as the reversiiig rod 39 pulls down the bell crank 4-5 to throw the :bevel wheel 42 out of engagement and the bevel wheel 43 into engagement with the bevel wheel 41 the return? rides over the nose 49 on the dcpendingfinger 48 which owing to the action of the spring 40 gives the bell crank lever a sudden impulse to complete its travel. Just as the bell crank is given this sudden impulse its upstanding end comes under the roller 56 and raises the locking device 54 so that the projection 55 is free from the annulus 52 and the further travel of the bell crank 45 causes the pin or roller 53 to strike the annulus 52 and force the sleeve 51 along the shaft 44 to obtain the desired reversed direction of 'rotation of the lead screw 19. As the travel of the bell crank is completed the upstanding end of the same passes under the roller56 on the locking device and allows this latter to be pulled down again under the influence of its spring 57 so as teleck the on the other side of its projection 55.;'"-'

annulus. 52

' The workpiece such as a cylinder issnit- 9 1,02e,e10 a ably mounted on the rotating work table 58. This worktable is mounted on a head-stock spindle 59 carried inv suitable bearings (30;

The head-stock spindle carries a pulley 61 rotated by means of a suitable belt 62 on a pulleyti mounted upon a counter shaft (i l.

The counter shaft ti l; driven from the main driving shaft (35 as shown in Fig. 1. The shaft 44 actuating the lead screw 19 is, as shown in Figs. 1 and 2, driven by a belt (idfrom the counter shaft (3%. This belt 66 preferably runs over guide pulleys 67 as shown. In order to obtain two speeds for the shaft it this shaft carries two pulleys'68 and 69 while there are two corie spending pulleys 70 and 71 on the counter shaft 64. The belt between the pulleys 69 and 71 is omitted for the sake of clearness. Byrnountiug a suitable clutch between the two pulleys 68 and 69 either of these two pulleys can be rigidly connected with the shaft s it. The pulley 6 is driven'as shown in the drawings from pulley 72 mounted on a wall bracket 73, this pulley being mounted on a shaft T-l which is driven from the main shaft (35. A suitable device for counter balancing the weight of the quill is secured thereto as shown at Devices are arranged about the lower bearing of the quill and about the grinding spindle to prevent grit getting into these parts. lVith this object in view the quill at the bottom end is provided with a cylindrical cup 76 which works over the lower end of the lower bearing 2 and inside a cylindrical. portion 77 secured to the bearing 2. At the same time the bottom end of the hearing for the grinding spindle is protected by- .means of a concentric piece 78.

When it is desired to grind any object the handle 18 controlling the half nut is turned to throw this half nut out of engagement with the lead screw 19. This also throws the projection 37 out of possible engagement with the .ops 38. The quill can then be bodily rarscd up through its bearings 2 and will be held in the position to which it is raised by the counter weight. lhe workpiece can then be placed on the work table 58 and the quill then pulled down to the desired amount and the two stops 38 adjusted to give the desired amount of traverse or reciprocation to lhequill. The handle 18 is then turned to throw the half nut 17 into engagement with the lead screw The handle 22) is then turned to release the wedge 26 t': an the annular groove and the whole qui 1 turned around about by means oththe handle 23 till the desired adjustment of the grinding spindle is obtaiiuul after which the handle lsicd so to lock the quill to the It some finer adjustment be annulus desired the micrometer screw 31 is rotated with the effect previously described. The

tive to the center of the ouill.

machine can then be started. On it being desired to measure by means of a limit gage or otherwise the bore of the cylinder or workpiece being treated all that it necessary to do is to disengage the half nut from the lead screw by turning the handle 18 and thenraise the quill by hand. If desired the whole machine can be self-contained and a bracket provided for the pulley 72 shown in Fig. 1 as mounted in a wall bracket. At the same time the counter weight can be arranged to work down the rear of the framework or main body.

In the foregoing description it has been assumed that the longitudinal axis of the quill was vertical. The invention is also applicable to horizontally operated machines as will be scen by placing Fig. 1 on its side and it will be realized that only a' few structural alterations will be necessary to bring about the desired result.

lVhen the machine is desired for grind-' ing the interior bores of cylinders it is of course desirable for the center of the work table to lie: under and somewhat ol'l'set relataole may however be placed definitely to one side in cases where it is desired to grind the outside of the object which is rotated on the work table.

In a somewhat simpler form of machine the driving spindle and the grinding spindle are arranged in one part' and are both mounted eccentrically in the quill. In this case naturally the pulley 6, as the grinding wheel is adjusted, tends to move away from or approach the pulley 72 or its equivalent so that it will be necessary to provide some means for automatically taking up the slack ot' the pulley which can be easily effected.

I declare that what I claim is:-

1. lo a machine of the character described. the combination of a rigid'quill or tube, bcariug for said tube. a tool spindle mounted ccccnlrically in said tube. means for driving said tool spindle. means for adjusting said tube angularly about its own axis; and means for imparting a reciprocating motion to said tubc.

2; in a machiuc-ol the character described. the combination of a rigid tube or quill, bearings 'lor said tube or quill. a tool spiudlc The work m-ccnlrically 'mouulcd in said tube at om cud lhcrcot. a driving spindle luouulcd couccutrically in llll olhcr cud of. said tube. opcralivo couucolious bclwccu said driving spiudlc and said tool spindle and int-ans for adjusting the lube augula|'l about its own axis and l'or rcciprocaliug the same substantially as dcscribcd 7 3- in a macliiiuol the cliarai-lci' dcscribciL. the combination of a tube or quill. bcariugs i'or said tube or quill, a tool spindle mounted ccccutrically in one cud of the -said tubc. a driving spindle mounted concentrically in the other end of said tube, a connecting shaft between said drlvmg spindle and said tool spindle, universal joints connecting'- said connecting shaft to said driving, spindle and said tool spindle, means for adjusting said tubeangularly about its own axis, and means for reciprocating said tube in the direction of its length.

4:. In a machine of the character described. the combination of a rigid tube or quill. bearings for said tube, a tool spindle mounted eccentrically in one end of said tube formedof two parts, a flexible coupling between the two parts of said tool 'spindle. a

driving spindle mountedconcentrically iu' the combination of a quill or rigid tube.

bearings for said tube. a tool spindle mount- -ed eccentrically in said tube, a collar held against longitudinal movement on said tube, a swinging bal't' nut mounted on said collar,

' a lead screw. bearings for said lead screw.

means for rotating said lead screw. means for reversing the direction oi" rotation of said lead screw at predetermined times and means to adjusting said tube or quill angle larly about its axis.

6. In a machine oi the character described the combinatiop of a tool spindle. means for supporting" and driving said tool spindle. rotatable means supporting a workpiece. means for approaching and withdrawing the tool spindle and the workpiece supporting means. the one to and away from the other; and means for adjusting said tool spindle and said workpiece supporting means the one relative to and in a curve eccentric to the axis of rotation of the other while the machine is in motion.

,7. In a machine of the character described, the combination of a rigid tube or quill, a tool spindle rotatably and ecceutrically mounted in said rigid tube, bearings for said tube', -'a'lead screw, means for rotating said lead sere\v,'means for altering the direction of rotation of said lead screw,a, half nut, a

fiuide rod acting as pivotal means for said alf nut, acollar on said tube held against Qlon itudinal movement relative to said tube, d collar also embracing said guide rod, an vamntliis embracing said guide. rod, flanges rigidly secured to the annulus embracing the guide rod; and means for adjusting the sai flanges together with said tube or quill anguflat-1y about the axis ot-said tube or quill.

8., In a machine of the character described.

the-combination of a rigid tube or quilL a too] spindle mounted cccentricallyin said rigid tube, means for reclprocatin Sa-Itllubc inthe direction of its ax'1s,a guide rod, an

- a shaft at right angles to and in the same embracing said guide rodand encircling said tube. means for holding said annulus against relative longitudinal movement. on said tube, a second annulus about said tube, a micrometer screw device, conuecting' said annuli, a-peripheral groove in i said second annulus. a tlange'rigidly secured to said tube. a handle, a projectionon said flange carrying said handle, and a wedge operated by said handle lying" in and adapted to engage when desired with the walls of the peripheral groove in the said secondannulus. t). In a machine of the character described, the combination of a quill or rigid tube, a spindle mounted ccccntrically in said tube, means for reciprocating said tube in the di rection of its axis, means for the angular ad-* justment of said tube, a reversing rod, adjnstable stops on said reversing rod, a pro-. iiection connected to said rigid tube normally 8 ying between said stops, and means for simultaneously moving said projection frombetween said stops and for disconnecting said tube "from said means for reciprocating said tube. I

10. In a machine of the character described. the combination -of rotatable supporting means for the workpiece, a tool spindle, meansfor moving the tool spindle toward and away from said workpiece supporting means, means for adjusting said tool spindle in a curve eccentric to the center of said workpiece supporting means, a reversing rod, stops on said reversing rod, a pro je'ction movable With'said tool spindle in the reeiproeations of this latter and normally lying between saidstops, a bracket-bathe machine, a bell crank mounted'ionlsaid bracket and connected to said reversi-n "'rod, a roller on said bell crank, :1 depending nger mounted on-said bracket, afnose onsaid depending fin er, a. spring normally-holding said depending finger against said roller, :1 bevel wheel connected to the means for re versing said tool spindle, a shaft at right angles to the center of rotation of said bevel whee], means for rotating said shaft, a sleeve on said shaft, bevel wheels on said sleeve, collars on said "sleeve, :1 proj'ect-ion'on the free end ofsaid bell-crank, a locking device engaging'on one side of one of the collars ofsaidsleeve, and means on said bell crankdisengagmg said shaft and freeing said locking device to lock saidsleeve in its new posi- Hon M i 11. In a machine of the character described. the combination of'a tool ;f-a lead screw for moving said tool forward and backward; a bevel wheel on said lead screw,

annulus lie plane as the axis of said lead screw, a sleeve on ,said shaft, bevel, wheels on said; sleeve, a lever, means supporting said lever, means, connectedto said tool spindle for moving;

said lover in the direction of-t ravel' e f theli il tool spindle toward the end of its travel, means connected to said lever for bringing the bevel wheels on said shaft alternately into gear with the bevel wheel on said lead screw, and means for locking said sleeve in two positions. f

12.111 a machine of the character described, thecombination of a tool spindle, a

bracket, a lever mounted on said bracket, a

project-ion on said lever arranged {between the collars on said sleeve, a hinged'locking device, means on said lever for raising said locking device to unlock the same, a spring connected to said locking device for. holding said device against the action of said lever, a reversing rod connected to said lever, means connected to said tool spindle foreperating said reversing rod, and spring means for assisting the movement of said lever in each direction toward the end of its travel.

13.1n a machine of the character de- 30 scribed, the combination of arigid tube, a

tool spindle mounted in said rigid tube, means for positively reciprocating said tube in the direction of its axis, means for the angular adjustment of said tube, a driving spindle mounted concentrically in the end of said tube away from said tool spindle, a pulley splined on said driving spindle, and means for throwing the means for positively reciprocating said tube out of operative con nection with said tube and for freeing said tube to permit of its being bodily raised.

14. In a machine of the character described, the combination of a rotatable sup port for the workpiece, a tool spindle, means for positively reciprocating said tool spindle, means for adjusting said tool spindle in a curve eccentric to the center of rotation of the said work supporting means, means for adjusting said tool spindle toward and away from said work supporting means; and means for freeing said tool spindle from its positive reciprocating means to perm t said tool spindle being slid away fro'msaid work,

supporting means.

In testimony whereof, I'fifl'lX my signature, in presence of two' witnesses.

ALFRED ANGAS SCOTT. Witnesses HUBERT PUMPHREY, Lucy RANEY.

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