US1281764A - Cylinder-grinding mechanism. - Google Patents

Description

E. W. CLARK.

CYLINDER GRINDING MECHANISM.

APPLICATlON FILED DEC 10, HJH

Patented Oct. 15, 1918.

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B Inventor. ZZdw E W CLARK CYLINDER GRINDING MECHANISM. 'APPLICATION FILED DEC. 10, I914. 1,281,764, Patented Oct. 15, 1918.

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CYLINDER GRINDING MECHANISM.

APPLICATION FILED DEC I0, 1914. I 1,281,764.. I Patented 00t.15, 1918.

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Invefiizor. Edward M CZanQ.

N ha Qw66 Waaw UNITED STATES Parana Qi ijitihl- EDWARD W. CLARK, 015 LOS ANGELES, CALIFORNIA, ASSIGNOR OF ONE-HAL TO ALVIN WELLS, 0F L03 ANGELES, CALIFORNIA.

CYLINDER-GRINDING MECHANISM.

Application filed December 10, 1914.

To all whom it may concern:

Be it known that LEnwnnn W. CLARK,

a citizen of the United States, residingat Los Angeles, in the county of Los Angcles and i tate of California, have invented certain new and useful Improvements in Cylinder-Grinding Mechanisms ot which the following is a specification.

This invention relates to improvements in grinding and boring mechanisms and has particular relation to a. mechanism capable of grinding or boring engine or other cylders, or shaping, or surfacing the interior of mechanisms or devices.

It is an object of the invention among other things, to provide a portable grinding or boring device which may be placed upon the'cylinder or cylinders to be ground or bored, and in the case of an engine of the multiple cylinder type, may be quickly transfer-led from one cylinder to another for grinding or boring each of said cylinders.

It is also an object of the invention to provide such a portable grinding mechanism with means for quickly and yet accurately centering the grinding mechanism with respect to the cylinder or other device to be operated upon.

ii .lt is a further object of the invention to provide grinding mechanism of the character mentioned in which a tool carrying mandrel may be adjustably carried by a concentiically moving or outer mandrel, where by the tool carrying mandrel may be set cc:

centricall for accom lishin the desired range of movement inthe tool used for grinding or boring.

It is a still further object of the inven-- tion to provide a grinding mechanism with suitable tool carrying mandrels, the same being mounted in an adjustable sleeve or support whereby the mandrels may be set at any desired angle for operation, or at any desired height in the supporting frame of the device.

With these and other objects in view the invention comprises certain novel construetions, combinations and arrangements of parts as will be hereinafter more fully described and claimed.

Specification of Letters lat'ent.

Patented Got. 15, Serial No. 876,48'i.

In the accompanying drawing:

Figure 1 is a side elevation ofa grinding and boring mechanism constructed in accordance with the present invention and po sitioned upon the engine cylinders of an automobile a portion of one of the cylinders being broken away to show a grinding tool in position therein.

Fig. 2 is a detail sectional view t n through the vertical standard of the frame which carries the grinding tool, and thrown the stem of the tool, the parts below being shown in plan with the grinding tool lo cated in a cylinder,

Fig. 3 is a detail transverse sectional view taken on the line 33 of Fig. 5.

Fig. i is a detail vertical sectional view taken upon the line -lof F Fig. 5 is an end elevation oi? the grinding mechanism mounted upon the cylinders of an engine as shown in Fig. 1.

Fig, 6 is a top plan view of the mechanism, a portion of the top plate being broken away and also portions of the base plate and the carrier bars mounted thereon.

Fig.7 is a transverse sectional view upon an enlarged scale taken upon the line 77 of Fig. 5.

Fig. 8 is a detail sectional view of tho micrometer .device carrying the diamoml employed in properly setting the grinding to: said diamond also being used to true up the edges of the tools.

9 is aside elevation of a portion of a lathe with the grinding device mounted upon the tool carriage thereof. 7

Fig. 10 is an enlarged detail sectional view through the mandrels of the grinding device together with the adjacent support ing parts;

Fig. 11 is a detail view partially in elevation and partially in section showing a boring cutter carrying attachment mounted npon the lower end of the outer mandrel.

The mechanism of the present invcntion is intended to afford a portable means for grinding, boring or shaping devices and more particularly for grinding or boring cngine cylinders or parts. The device is well adapted for gri ding and boring the cylinders of automobile engines, for it can cylin means may be assed through the openings for securing t e holding means used for .beflac'ed upon the cylinders of the engine quickly adjusted so as to be properly centered for accurately finishing the interrior of a cylinder, an c an then be readily moved to an adjacent cylinder for rinding or borin it. The mechanism can owever be place upon a lathe if desired for cooperating with the parts thereof for grinding or shaping devicesof various kinds. The details and features of the invention will {now be more specifically described with ref erence to the accompanying drawings in which the preferred form of mechanism em-.

. bodying the invention is disclosed, and in which 10 indicates a base plate, 11 carrier bars adjustably'mounted thereon and 12 a sliding member or carriage movably mounted upon the said bars. Any desired form of base plate may be employed for supporting the carrier bars, but oneof the type shown in Fig. 6 is preferable since it is rovided with a series of openings 13 usual y closel spaced with respect toeach other, where y the plate may be eiagag'ed by bolts tor clamping it-to a er or cylinders, or bolts or securing ,kee ing the carrier bars 11in place on the sai plate. Thus as shown in Figs. 1 and 5- clamping bolts 14 may be employed for clamping the base plate 10 to the flanges of a block of engine cylindersi15, I

' adjustable holdin which bear 'on the adjacent ends of thelet 20 an through slots 22 whereby the blocks 18 may ju sting the carrier bars 11.

The carrierbars 11 are preferably held in position on the base late 10 by means of evices made up of plates 16 having olts 17 ;1adapted to engage any of the, openings 13 for fastening the late's 16 upon said base. Bar support ing locks 18 having bar receiving sockets 19, rest upon the said plates 16 and are adjustablg secured thereon by means of bolts nuts I 21, the said bolts passing be adjusted longitudinally. The nuts 21 are generally provided with handles 23 for corn venience in operatingthem and quickly ad- The plates 16 are also usually provided with upturned end portions 24 carrying adjusting screws 25 blocks 18 for obtaining a nicer adjustment of the said blocks and the bars 11 carriedsaid standards. generally bein curatcly center the grinding or boring tool with res ect to cylinder. Such adjust ment is acilitated by the adjusting screws 25, the nuts 21 being loosened temporarily, and tightened after the adjustment.

Adjustably mounted upon the bars 11 is the sliding carriage 12 having passages bored therein on each side, to fit upon the bars 11. The ends of the elongated bearings thus formed areusuallysplit for a short distance at their ends as at 28 and bolts 29 are provided for drawing the split portion together after the carriage has been pro erly adjusted for firmly holding the sai carriage in such adjusted position while the boring or grinding operation is progressing. In bringing the'carriage with the grinding tool and the operating mechanism therefor over a cylinder, the carriage is slipped longitudinally of the bars 11 until approximately in the right position. Adjusting collars 30 and 31 mounted upon the bars-11, one being located on each side of the carriage l2, and one on each bar 11, are slipped against the sleeve or hearing portions of the carriage. Each of said collars carries an adjusting ring which may be termed for convenience, a -m1crom- 'eter ring as 32 and 33, the said rings having peripheral scale markings adapted to be r moved with respect to marks or indications 34 and 35 on the ends of the carriage sleeves.

1 Each collar is split and has a clamping bolt as clearl shown in the drawin and when the carriage requires a line ad ustment in either direction, th collar which is to push the carriage in the direction desired is slipped against the carriage sleeve and clamped on the rod 11, after which the micrometer ring is turned until the desired position of the carriage has been attained.

If the carriage "must" be adjusted slightly in the opposite direction, the other collar with its micrometer ring is employed, the first collar having-first been jloosened sufficiently to permit the necessary returned adjustment of the carriage. By the use of the two collars described, a very accurate 4 adjustment of the carriage with its grinding oyhoring tools may be had.

Ai'lslng from the sleeve portions of the carriage 12 ar'e'uprights or standards 36,

cylindrical in shapeand may be formed 0: rods or bars which' are thick enough to ssess the necessary rigidity and stifi'negsflii' properly hold+ ing the tools for ace, plishing accurat I work. The upper ends of said stander s- 36 are connected and braced by a top plate or ring 37. The ring formation of said plate permits access to the upper end of the mandrel supported between ,tlie st'adards for adjusting the tool carryin which operates within it, as wifi inafter more fully described] The said standards 36 carry a vertically. inowng carriage made up '01 sleeves 3S and been vertically adjusted. The said sleeves are provided'with oppositely arranged disk portions 42, the inner faces of which bear fagainst correspondingly shaped portions i'pon the casing 40. Projecting from the central portions of the disks d2 are trunnions 43 which engage corresponding. recesses 4st in the casing 40. The casing l carrying the operating tools -may thus be turned between the disk portions 42 of the sleeves 38 and 39 so as to extend vertically between the standards 36, or horizontally with respect thereto or at any inclined angle with respect to said standards that may be needed for accomplishing work of any kind. The edge of one ofthe disk portions 42 may be provided with scale graduations 45 adapted to be moved with respect to an arrow or other indicating mark -16 on the adjacent portion of the casing 4'0. The parts may be clamped in adjusted position by means of clamping bolts 47, which are threaded in apertures in the said disk portions 42 and have cross heads 48 at their inner ends which engage circular undercut grooves formed in the side faces of the said casing 40, as will be readily understood by reference to Figs. 3 and of the drawing.

For convenience in bringing and holding the casing to a perfectly true vertical adjustment a pin 50 may be inserted in. registering holes bored through one of the disk portions 42 and in the face of the adjacent portions of the casing 40.

The casing 40 is cylindrically bored to re eeive an elongated hearing member 51. As the casing is more frequently used in its vertical position, than in any other, the

, bearing member 51 is generally formed with an annular projection or thickened portion 5% at its upper end which rests upon the upper edge of the casing to. The said bearing member 51 is elongated so as to extend a considerable distance below the casing 40, and is centrally bored longitudinally thereof to form a bearing for an outer mandrel secured to a shaft 56 journaled in bearings The upper end of the said mandrel 53 is enlarged so as to extend over the annular projection 52 and is provided with gear teeth forming a Worm gear 54 adapted to mesh with a worm 55 mounted to one side of the mandrel. The said worm 55 is rigidly 57 and 58 which project upwardly from the upper edge of the casing 40, outside the annular, projection 52 and the Worm gear 54, as will be clearly understoodby referclaimed.

in Fig. 10.

once to Fig. 6 of the drawing. The said shaft 56 is provided with any desired mechanism for driving it, preferably as will be hereinafter more fully described and The lower end of the mandrel 53 is provided with exterior screw threads which are engaged by a ring nut 59 for preventing any longitudinal movement of the mandrel within the boa ring member 51.

- The ends of the mandrel 53 carry blocks 60 and 61, said blocks extending from the end of the mandrel, inwardly a sullicient distance to receive adjusting means for op erating the inner or tool carrying mandrel sleeve 62 which. extends longitudinally through the said outer mandrel. The blocks 60 and 61 are usually fastened in the ends of: the mandrel 53 by set screws 63. The said blocks are each of them provided with elongated openings 64;, the ends of which are generally made sen'ii-cylindricah the inner end of each opening being concentric with the mandrel while the outer ends extend to the peripheral edge of each block so as to have only a thin wall atthat point will he clearly understood by reference to Figs. 3 and 7 of the drawing.

Adjustably mounted in the said openings 4- and extending throughout the length of the outer mandrel and short distances beyond the blocks 60 and (ll is the inner mandrel containing sleeve 62 usually of just said mandrel being held concentrically of the sleeve by means of suitable bushings G6 and 67 which are set in enlarged recesses inthe ends of thc slecvc 62. The bushings are held in place and protected at the ends of the sleeves in any desired manner, ring caps 68 and 69 being usually screwed on the ends of the sleeve 62., as clearly-shown The hollow mandrel is provided with a redpced threaded portion 70 at its upper end which projects through a central opening in the cap 68 and is engaged by locking ring nuts 71 and 72-, said nuts generally having holes in the periphery thereof which may he engaged by spanner tools for adjustment A grooved pulley 73 is also applied upon the said threaded end portion 70, of the mandrel for rotating the same. I

The lower end of the bore in the mandrel 65 is enlarged and tapered as at 74 to receive the tapered end of the shank 75 of the grinding tool. A drawbar 76 fits in the remaining portion of the'mandrel bore and has a reduced threaded end portion 77 adapted to engage a threaded socket in the shank 7 5 for drawing the same tightly into v and is also provided with a man sided or hexagonal portion 79 for the app ication of a wrench or keyin turning the said dravvbar.- The rotation of the mandrel is thus effective ,for rotating the shank of a tool when the mandrel is driven by suitable belting as hereinafter described.

Inasmuch as it is needful to properly 011 or lubricate the outer and inner man rels, and yet it is desirable to prevent oil from running down upon the grinding tools employed, which tools are usually of emery, carborundum or the like means is provided for preventing any oil which may work I downwardly from the bearings of the mandrels, from reaching the shank of the drill and thereby the tool. For this purpose the lower end of the mandrel 65 1s provided with an annular shoulder 80 below which a reduced threaded portion 81 projects as illus trated in Fig. 10. An oil collecting cup 82 is provided with a threaded aperture adapted to engage the reduced threaded portion 81. The outer peripheral portion of said cup is made large enough to extend be v yond and around the lower cap ring 69.

Suflicient space is left between the ring and the cup to collect the slight drippings of oil that may run down from the mechanism above. The central threaded portion of the cup 82 is screwed tightly against the shoulder 80 to prevent leakage at that point.

The cup can be removed from time to time whenever the oil appears to collect therein Emery or other grinding heads or tools do not do well if oil reaches them, as is well known ,and hencemuch of the grinding of cylinders, englne rings and other devices is done with the arbor-s of the tools in horizontal positions to avoid getting oil thereon. By the use of the oil cup just described tools can be operated in vertical positions or inclined positions without the trouble heretofore experienced with the oil. It is es pecially desirable with a portable device like that of the present invention to be able to do the grinding with vertically held tools, for it is easy to set the device upon engine cylinders as above set forth and especially when operating upon automobile engines of any kind.

The manner in which thelinner mandrel is adjusted and positively held forms an important feature of the invention. The

said mandrel 46 is adjustedby moving the sleeve 62 toward and away from the axis of the outer mandrel 53. To accomplish'this adjustment, parallel oppositely threaded screw rods 83 and '84 are arranged in the upper and lower blocks 60 and (51 respectively. The'upper and lower pairs of screw rodsare operated in the same manner and a description of'the upper pair with reference toFigs. 7 and 10 will sufiice tor bothr adapted to -fit tight a screw 98, which shall call for conv a micrometer screw. The rmicrom'eter Eachof the screw rods is provided with a gear 85 which meshes with a worm 86 secured to a longitudinally extending shaft 87 1projects to the upper surface of the upper lock 60 as shown in Fig. 6, so as to be a proximately flush therewith whereby t e key can be readily inserted at any time for turning the shaft 87 and the worms carried thereby. The blocks 60 and 61 are usually provided with removable-blocks 89 which. normally close 0 enings through 1 which the screw shafts an their gears may be inserted, when assembling parts of the device. The smooth portions of the screw rods 83 and 84 enga bearings in the said blocks 60 and 61, w ile the threaded 0rtions pass through cut-away portions 0 the sleeve 62 and engage threaded apertures in ,nuts 90 set in recesses formed in the 0125i) site sides of said sleeve b will be rea understood by reference to Fig. 7. It will i be thus apparent that by turmng the shaft 87, the screw rods 88 and 84 may becaused to move the sleeve 62 away from the axis of the outer mandrel, to secure any desired eccentric action in the inner mandrel carried by said sleeve. This structure facilitates the moving of the rotatin grindin tool around the inner surface 0 the cylim ler to be ground with somewhat of a gyratory movement as will be readily understood by an examination of Figs. 1 and 2 of the dravving. The grinding tool is kept in rapid rotation by drivin' the pulley73 and the periphery of said'grindmg tool is carried entirely around upon the inner surfacepf the cylinder by the rotation of the ;outer and the gear 54.

mandrel through the ageney, of the worm 55 The eccentric adjustmentof the ding Y .car-

or boring tool and the inner man rying the same is of'course accommodated to the size ofthe cylinder The accurate setting of a facilitated also by the use such as is commonly employed for .truing up grindin heads or tools. the sai alsoone of the important features of this invention. The diamond is carried by arod 92 having a suitable handle 93, the said rod e s me gr n 1 too. is. of a dilfnondfil The mounting of? diamond 91 and its adjustment is :1

being tapered as-shown in Fig.8 and thus ly in the tapered bore 9;

memes ter screw is provided with an adj ustin head 95 having scale graduations 96 on t e periphery thereof. which are moved by turning the said head, with respect to a scale bar 97 also having scale indications thereon, said bar 97 promoting from the bridging portions of the carriage 1:2, above and parallel with the micrometer screw 98. The adjustment of thefmicronieter screw permits the diamond to be set with a very fine ad- 'and trued by turning it against the same, to

cause said grinding tool to take off the desired material from the inner surface of the cylinder. It will be observed that an opening of sufficient size is provided in the transverse bridging portion of the carnage 12 to permit the diamond to be readily seen as well as the bore of the cylinder and the grinding tool, to permit of the setting of the tool for the grinding operation.

Means is also provided for carrying the grinding to )l downwardly as it moves around within the cylinder. which is being ground. This means usually consists in a vertical feed screw 100 which engages a.

threaded aperture formed in the top plate or ring 37 of the device. The lower end of the feed screw 100 has a swivel connection at 101 with one of the sleeves as 38 of the vertically moving too] carriage. The upper end of said screw rod may be provided with a cross handle 102 so that the screw can be fed up and down by hand when desired, as for instance when setting the boring tool. when the grinding operation beg'ins however it is preferable to em 'loy an automatic feed. for steadily feeding t e carriage downwardly as required. The lower end of the screw 100 is extended below the swivel connecti n 101 and is provided with a gear 103. ad: ted to engage a worm 101: which is brought into mesh therewith at, the proper time. The worm 10 i is carried by a shaft 105 which is journaled in a bracket 106 securedio the sleeve The shaft 105 is providedyvith anecccntric in the bearing formed in the bracket 106. the said eccentric as indicated by dotted lines at 107 in Fig. .6 so that bx turning the said shaft the eccentric will cause the shaft to move the worm 10 1 into somewhat slack so that. it can be removed from the pulley 110 and crossed for reversing the feed when desired. The slackness of the belt is taken up by a pulley 111 carried by a lever 112, one end of which is journaled upon the shaft 105 while the other end is drawn toward tho belt by a spring 113. It will be understood of course that said belt 109 may be shifted from one part of each double pulley to the other in accordance with the speed the feed mechanism is to be driven.

The shaft 56 is usually driven by a sprocket chain 114 which passes around a sprocket wheel 115 secured to said shaft 56, and a sprocket secured to a pulley 116. said pulley 116 is carried by the bifurcated ends of a spacing rod 117, the other end of said rod being also bifurcated to accommodate the sprocket wheel 115 and journaled upon the shaft 56. The pulley 116 is driven' by any suitable belt 118, which extends to any suitable source of power not shown. By this mechanism power may be communicated to said shaft 56 for operating the worms 55 and 104, no matter to what position on the carrier bars 11, the carriage 12 may be shifted for reaching and grinding any one of the cylinders of an engine.

A similar yielding feed mechanism must also be employed in driving the pulley of the tool carrying mandrel. Thus a belt 119 may extend from the said .pulley 73 to a pulley 120 carried by a spacing bar or rod 121. the said pulley 120 usual] being a double pulley, so that another bell; extend therefrom to adouble pulley 123. The ulley 123. receives its movement from a be t 124 which extends to any suitable 122 may source of power not shown. The weight of keep the belt 119 taut at all times so that notwithstanding the gyratory eccentric movement of the tool carrying mandrel, .the said pulley 73 will be constantly rotated. The belt connection just described also per: mits the placingof the carriage 12 over any of the cylinders that are to be ground or bored in thesame manner described with respect to the belting and sprocket chain for driving the shaft 56.

The port ble character of the invention is not only 0 advantage in that it can be moved about from one cylinder of an engine to another, but also because the device can be readily placed in any ordinary latheand adjusted for horizontal or inclined use. Thus as shown in Fig. 9 the carriage 12 may be mounted upon bars 125 bolted or otherwise secured upon the tool carriage 126 of a lathe 127. -By turning the casing 40 to a horizontal position as shown in said Fig. 9, a

grinding tool as 128 may be caused to grind the interior of any article as 129 which may be secured to the usual face plate 130 of the lathe. In using the device in the lathe v the? tool mandrel is usually brought to the central concentric position within the outer mandrel and the outer mandrel need not be operated, the inner one only being rotated by belting 131, for turning the grinding tool 128. The article ground will usually be turned by the, rotation of the face plate 130 of the lathe, in the usual way. As indicated in dotted lines also the casing 40 may be tipped upon its trunnions 43 to any desired angle according to the surface or article upon. which the grinding or boring tool is to be operated. The great adaptability of the mechanism of this invention to various kinds of Work willthus be evident.

While the boring tools of any kind can be applied to either mandrel, where it is necessary to take off a greater portion of material, than is generally removed by the ordinary grinding tool. it is preferable to em-- ploy a simple tool holder like that shown in Fig. 11 of the drawing. The said tool holder 132 is made hollow and'provided with a screw threaded opening 133 of a proper diameter to slip over the oil collecti within the bearing member 51.

ing cup 82 and engage the threads upon the lower end of the outer mandrel 53, the device being screwed up tightly against the ring nut 59 which holds the mandrel 53 The tool holder 132 is also provided with a transverse tool socket 134; in which any boring tool 135-1nay be placed. A set screw 136 is provided for clamping the tool in said socket. When it is found that a grinding tool will not take oil sufficient surface to properly finish the interior of a cylinder, it is only necessary to remove the grinding tool and screw the tool holder 132 upon the outer mandrel 53, in order to permit the employment of a boring tool to make any desired out upon the inner surface of the cylinder or other article. Of course in this instance it is not necessary to drive the inner mandrel at all and the belt 119 is not placed upon the pulley at that time.

The bearing member 51 is normally hold fast in the casing 40 by clamping bolts 137 applied at the split and portions of the said casing -l0 for drawing the ends of the casing tightly upon said member. By unscrewing the said clamping bolts, the bearing member 51 carrying both of the mandrels may be readily removed at any time for the exami-. nation of the parts and for cleaning or repairing and adjusting the same if found needful.

The operation of the various portions of the device will be readily understood in connection with the above description. In using the mechanism on an ordinary automobile engine for example, the device upon the base plate 10 is rested upon the open ends of the,

cylinders of the engine as indicated. in Fig.

1, said plate being bolted thereon in any desired manner. The carriage is slipped along the bars 11 until ap roximately in. position over the cylinder to e ground. A grinding tool is then placed in the mandrehland the feed screw 100 operated to lower thecarriage until the said tool projects into the cylinders; By the application of a squared rod or key to the socket 88 of the shaft or rod 87, the

which is carried by the bridging portion of the carriage is then set so that its cutting point or edge will be the desired radial distance from the center of the cylinder to cause the grinding tool when just touching the same, to quired diameter. The cylinder .is usually increased in diameter by the grinding operation, just enough to true up the cylinder from end to end and when the diamond is ,i

once set, it does not have to be changed for two or more cylinders of the same engine.

When the grinding tool is set eccentricallyso that it will just touch the diamond sufficiently to have its grinding surface renewed by turning against the said diamond,

the said tool will after passing the diamond and being slightly reduced thereby, grind the cylinder to the exact size desired? In shifting the carrier to succeeding cylinders,

the diamond is not changed in its adjustment and when the grinding tool will just pass the diamond, having its grindin edge freshened thereby, each succeeding cylinden will be absolutely the same diameter as the preceding one or ones. sult is not as possible with devices in which the zfylinder to be ground is moved with re- ,spect to the grinding tool, in accordance with the common method heretofore in use for. it is very'difiicult to readjust successive cylinders with respect to a grinding tool so that they will occupy exactly the same relation to the tool as the preceding cylinder.

With the present invention in whi clrthe diamond after once set, needs no read ustment for successive cylinders, a grinding tool which will just pass the diamond, engaging it sufficiently toliave a little of its peri hery removed, will of necessity produce a cy inder of the same diameter in every case.

disturbing the adjustment of'the int'ndrels.

Thuswhen more material must be taken .from some of the cylinders of an engine than can be welLremoved by a grinding tool,

the grinding tool is removed from its mandrel and the tool carrying member 132 is given a complete 75 grind the cylinder to the re- 85 This accurate re- 105 120 It will be observed that in the device emscrewed into place at the lower end of the. mandrel 53. and the cylinder is first bored to give it the desired diameter. it is only necessary then to remove the member 132 and place a grinding tool in the inner mandrel in order to finish oft" any slight unevenness in the cylinder that may be left by the grinding tool.

In connection with the outer mandrel 53 and the adjustable sleeve (32 within it, means is preferably provided after the said sleeve has been adjusted to a proper eccentric position to clamp the sleeve firmly therein. This is'generall y accomplished by placing a nut 138 on the lower threaded portion of the sleeve 62 so as to bearagainst the lower end of the mandrel 53 and another nut 139 is applied to the upper threaded screw portion of the said sleeve .62 so as to bear against the upper end of the said outer mandrel 53. When adjusting the sleeve it is usually only necessary to loosen one of said nuts, say, the upper one 139, and after the sleeve has been moved to its proper eccentric position in the mandrel 53 to tighten the said nut for firmly holding it in place in said mandrel.

It will be understood that when the carriage 12 is to be moved along the bars 11 and centered successively over the different cylinders of a multiple cylinder engine, for

- mounted thereon and adapted to be clamped upon an article to be ground, and a tool operating mechanism traveling upon said guide ways and adapted to be adjusted over one or more articles to be ground.

2. A portable grinding mechanism comprising a Work engaging base, adapted to extend over articles to be ground and ha ving longitudinally extending carrier bars.

. means for rotating a grinding implement.

said means being adjustable on said carrier bars-whereby it will be caused to operate upon one article to be ground after another. and means for imparting a gyratory movement to th implement, whereby it will be brought, in 0 contact with every part of the surface of the article to be ground.

A portable grinding mechanism comcarriage movable over said base. a tool carrymg mandrel journaled upon said carriage whlroby the tool may be directed in any desired manner, means for giving the tool carrying mandrel an eccentric action on the carriage for carrying the grinding tool over every part of the surface to be ground, and means for allowing said tool to move in a direction parallel-with the center line of said mandrel. j

4. A portallegrind-ing mechanism having a double mndrel mechanism, one being within the other, means for imparting movement to each portion of said double mandrel mechanism for carrying a grinding .tool properly over the surface to be ground, and means for holding the said mandrel mechanism at any desired angle with respect to the work.

5. A grinding mechanism having a tool rotatin mandrel-and an inner tool shifting mandre means for rotating the tool mandrel, independent means for operating'the tool shifting mandrel, and carrying means for the mandrel mechanism adapted to hold the tool at any desired angle to the work.

6. A grinding mechanism comprising a carriage, a rotary mandrel having a radial recess therein, a tool mandrel a mechanism for adjusting said tool mandrel in said recess and giving it an eccentric throw. and means for rotating the toolcarrying man dreL- 7. A grinding mechanism comprising a rotating mandrel having a radial guide Way therein, therein and capable of adjustment in said guide way with respect to the axis of the said rotating mandrel and means for adjusting the tool driving mandrel from a concentric position to eccentric positions I in said rotating mandrel.

8. A grinding mechanism having an outermandrel and an inner mandrel, the outer mandrel having radially arranged guide ways therein. means for ad usting the inner a tool drivin mandrel mounted mandrel in said radial guide ways with respect to the outer mandrel and independent means for rotatmg cach mandrel.

' 9. A grindmg mechanism comprising a ?iipport adapted to besecurcd to articles to ,')8 ground, a carriage adjustably mounted thereon and movable transversely tothe axis of the article to be ground, means for setting the said carriage with respect .10 the surface to be ground and a mandrel mechanism mounted upon said carriage for operating a grinding tool. A

10. A cylinder "grinding mechanism having adjustable carrier bars whereby the carriage may be moved over a plurality of cylinders, a carriage adjustable upon said bars and a tool driving mechanism mounted upon said carriage. prising a work engaging base, an adjustable 11. A grinding mechanism comprising a base having guide Ways thereon, a carriage pro ecting upwardly upon sa d gu de ways and having members traveling thereon,

I prising a base, parallel guide bars'adjust- A journals cally raising guiding upright members and means for'adustmglthe position of said upright members upon t c said carriage.

-12.,A cylinder inding mechanism com- "prisin -'e1on ated guides adapted to extend ing the 'mandrel mechanism.

13. A cylinder grinding mechanism having-a base, guide bars thereon adapted to extend over a plurality of cylinders, a carriage having foot portions adapted to slide upon said guide bars for bringing the mechv anism over. any desired cylinder, a mandrel mounted in the said carriage andmeans for actuating the mandrel to drivea grmding tool within any ylinder over which the car- -riage may be disposed.

14. A cylinder grinding mechanism comably mounted on said base, and adapted to extend op osite a number of cylinders to be groun" upright standards adjustably movable on saidbars for positioning the. grinding mechanism over thecylinder de sired, a mandrel mechanism ournaled upon said standards, an inner tool carrying mandrel in said journaled mandrel and means for drivin' the .tool mandrel, the structure of themec anism being such that aplurality of cylinders may be ground to exactly the samediameterlii I i 15. A cylinder grinding machine comprising an elongated guide mechanism ad a ted't'o extend across the ends ofa plurality o cylinders, an upright carriage havingstandards and sleeves at the lower ends thereof ada ed to move-onsaid guide way,

vertically 1 v \v moving slee' ves on said standards, a mandrel-5 mounted thin saidstandards and having ,erposed between the same. and said vertically moving sleeves, whereby the mandrel may be set at any desired'an'gle between the standards, means for automati- Til lowering thesaid sleeves on saidrstanda ds for advancing agrinding toolavithin a cylinder to be groun a tool carrying mandrel revolubly mounted within the outer mandreland adapted to carry a tool below the guide base whereby it may be caused to grind any of the'cylinders over which the mechanism maybe placed.

16, A portable 'cylindergrinding mechanism, having an adjustable carrier adapted to bepositioned with respect to a cylinder to. be ground, an outerfmandrel journaled upon said carrier, and having laterally extending guide ways, inner mandrel adjustably "mounted with respect to the axis of the said outer mandrel in said guide ways, means for adjusting the inner mandrelto diflerent degree's oi eccentricit with respectto the axis of said outer'man rel, and means for movzontally ing the mandrels longitudinally of the cylin-' der to bring the grinding toolinto contact I nism for actuating the said tool, a vertically moving carriage carrying said mandrel mechanism, a'horizontally moving carriage supporting said vertically moving carriage adapted to move over a number of. adjacent cylinders and means for adjusting the horimoving carriage with respect to the cylinder to be ground.

i 18. A grinding mechanism comprising an adjustable carriage adapted to be held with respect to a plurality of articles to be ground, mandrels movably mounted on said carriage whereby the mandrels may be set at any desired angle withrespect to the work and means for actuating the said mandrels for causing a grinding tool to act upon a given surface. a

19. A grinding mechanism having an elongated guide'way, an adjustable carriage adapted to be moved longitudinally of said guideway and to be held with respect to a plurality of-articles to be ground, a secondary carriage journaled on the first mentioned carriage and adapted to be adjusted at an angle'with respect thereto, a boring mechanism carried by the secondarv carriage and means for feeding the secondary carriage upon theifirst carriage for causing the boring toobto engage every part of the given surface.

20.. A grinding mechanism having. an

outermandrel adapted to carry the arbor'of' a grinding tool, a sleeve adjustably mounted in said mandrel and adapted to receive the arborof the tool, screws for moving the said .sleeve to different parallel positions with respect to the axis of the mandrel, gearing for operating the said screws. a shaft for actuating the said gearing and a tool old with respect to a cylinder, a hollow mandrel mounted upon said support and having radiatingguide openings in the end portions thereof, a hollow sleeve mounted within the said guide openings, means for adjusting the sleeve to eccentric positions in a the mandrel, a tool carrying'mandrel journaled in saidsleeve, means for rotating said latter mandrel, and means for'rotatin said former hollow mandrel .for'carryin'g t e rotating tool entirely around the inner surface of the cylinder.

22. A cylinder-grindingiridchanism com-j prising an adjustable support; adapted to be astened to a cylinder, an outer mandrel having radiating. guide ways fin' the ends thereof, a sleeve extending throughsaid guide ways, pairs ofadj-usting 'screws ar ranged near each endof said mandrel, gears to turn the same simultaneously for adjust 7 ing the pairs of screws at each end of the mandrel simultaneously for setting the sleeve with respect to the axis of the mandrel and in parallel relation therewith, a

hollow mandrel journaled in said sleeve and having a tapered socket therein for receiving'the shank of a tool, a draw rod for fastening the shank of a tool in said socket, a

pulley adapted to turn the said mandrel,

and means for turning the outer mandrel, the relative actions of the two mandrels operating to move a tool entirely around the inner surface of the cylinder to be ground.

23. A grinding mechanism comprising an adjustable carriage having a pivotally mounted casing, means for clamping the casing in any desired position upon its pivot points, a bearing member fitted in said casing, a hollow mandrel journaled in said bearing member and having a gear secured thereto, a worm meshing the said gear, means for driving said worm for actuating said gear and turning the mandrel, a tool carrying mandrel mounted within the said hollow mandrel, means for rotating the said tool carrying mandrel independently of the other mandrel, and means for advancing the .said casing toward work whereby a gyratory action may be imparted to a tool for afiecting every part of the work.

24. A grinding mechanism having a carriage adjustable toward and away from an article to be operated upon, a tool operating mandrel mechanism having a worm gear,

worm meshing therewith for turning the t mandrel mechanism, a shaft for actuating the said worm, a feed screw adapted to ad Vance the carriage toward the work, a gear for turning the said feed screw, a worm meshing therewith, and means for driving said worm when the first mentioned worm' is driving the mandrel mechanism whereby the grinding tool will be advanced'over the surface of the work as it affects the same.

25. A grinding mechanism having a support, sleeves adjustable upon said support and having oppositely arranged bearings thereon, a casing movable on said bearings whereby it may be set at any angle thereto, means for holding the casing in its adjusted positions, a mandrel mechanism carried by said casing, having an inner tool carrying mandrel and an outer tool gyrating mandrel, means for holdingthe tool carrying mandrel iii-eccentric relation to the other 1 v grinding mechanism over any part of the article operated upon. I r

In testimony whereof, I have hereunto set my hand, in presence of two witnesses.

EDWARD W. CLARK.-

I WitneIseS:

C1 ssnLL SEVERANCE, EARLE R. POLLARD.

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