US1649124A

US1649124A - Suefacihg machine

Info

Publication number: US1649124A
Authority: US
Publication date: 1927-11-15
Anticipated expiration: 1944-11-15

Description

Nov. 15, 1927.

G. A. OLIN SURFACING MACHINE Filed April 25, 1924 7 Sheets-Sheet 2 1522757; d aabaf ,Zi 02m? Nov. 15, 1927.

G. A. OLIN SURFACING MACHINE Filed April 25. 1924 7,Sheets-Sheet 4 ,frzwrzir: Gastaf ii. 223

orngy 7 Sheets-Sheet 5 I\ Nov. 15, 1927.

G. A. OLIN SURFAGING MACHINE Filed April 25, 1924 fzmyzz'r: G astczf E. 03372 .Ill'l I '7 Sheets-Speet 6 G. A. GUN

SURFACING MACHINE Filed April 25, 1924 QNN fir/72252: c asta 10251? warn e5 Nov. 15, 1927.

QNN

Patented Nov. 15, 1927.

GUSTAF A. OLIN, O3? 'WORCE8TER, llEASSACI-IUSETTS.

SURFACING MACHINE,

Application filed April 25, 1924.

This invention relates to improvements in surfacing machines and, has particular rcitcrence to a novel and improved construction of machines especially adapted for use in surfacing various forms of disks, such as grinding and abrasive wheels, clutch plates and similar articles.

One of the objects of tee tion is the provision o a uchine which shall be capable of sate: i only handling large and heavy disks and which may be cmployed to operate upon ei her one or both surfaces of the disk at a time as may be preferred.

A further object of the invention is the provision of a machine of the character specified which when employed in surfacing both sides or" a disk will insure the two tacos of the disk being sufiiciently parallel for all commercial purposes, and which will reduce to a minimum the time neccssry to properly position a disk within Sui; cing machine and which will eliminate all the ditliculties hitherto experienced with uni-lateral machines in which it has been necessary to shift and carefully set up the disk for the proper surfacing oi the second side with re spect to the first.

Another object of the invention is the provision of a machine capable oi satisfactorily handling and automatically positioning various forms and types of disks and which may be employed with equal satisfaction with disks having central arbors or with disks having merely an aperture centrally thereof to subsequently receive a shaft or arbor, and which in either event will insure formation of the surfaces of the disk in proper relationship to said central aperture or arbor.

Another object of the present invention is the provision of a machine oi the character set forth which shall be particularly adapted for handling and treating largo abrasive wheels and which shall be so constructed as to resist to a maximum degree wear of the several parts thereof due to action oi the abrasive particles removed during the surfacing operation, and in which the various vital parts effecting satisfactory and accurate operation of the device shall be protectcd against access of abrasive thereto, and in which parts liable to become stuck or present inven- Serial No. 708,921.

frozen shall be both protected and at the same time rendered readily accessible for release thercoi upon failure of same to properly operate.

Additional objects of the invention include the production of novel and improved means :lor automatically and for manually controlling the operation of the several parts of the machine and of improved mechanical features simplifying and improving the operation of the individual units together c0nstituting the machine as an entire operable combination.

Certain embodiments of the invention are illustrated in the accompanying drawings, but it is to be understood that I may make any modifications in the specific details oi construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of the invention. 1

Figure l is a front elevation of one embodinicnt oil the invention.

F igure 2 is an end view with parts shown in section.

Figure 8 is an enlarged detailed view of the arbor positioning device.

Figure 3 is a view on a corresponding scale of the centering point release lever and associated parts.

Figure is a view of the rear of the machine with the gearing case shown in section and the drive motor for the chuck at the side of the machine.

Figure 5 is a slightly modified sectional view as on the line 5-5 of Figure at.

Figure 6 is an enlarged sectional view oi one of the special bearings for the disc-carrier.

Figure 7 is a detail of the take-up for lateral play when the parts begin to wear.

Figure 8 is a section on the line S8 of Figure 1.

Figure 9 is an enlarged view o l the cutterslide adjusting mechanism.

Figure 10 is a section on the line lU1O of Figure 1.

Figure 11 is a fragmentary section on the line 11-11 of Figure 10.

Figure 12 is a central sectional view of the disk-holding member or clutch.

Figure 13 is a detailed sectional view of the releasable gibs for the cutter feed-slide.

Figure 1a is a fragmentary view illustrating the oil reservoir for lubrication of the slides of the main table.

Figure is a view in elevation of the centering arbor usable with my machine.

Figure 16 is a sectional view thereof.

Figure 17 is a fragmentary sectional view illustrating the lateral guides for the main table.

Figure 18 is a fragmentary elevation illustrating said guides.

Figure 19 is a fragmentary section as on the line 1919 of Figure 12.

Broadly speaking, the present invention comprises a heavy bed or support and a table slidablc on the support, the parts being of sufficient weight or inertia to permit of handling of heavy work without vibration or chatter of the parts. The table is centrally slotted to provide clearance for an annular frame carried by the bed. This frame has rotatably supported therein by suitable dustproof antifriction devices a clutch member for engaging and supporting the disk to be operated upon. The annular frame is provided with. means for positioning the disk within the clutch to both center it axially of said frame and with its axis coinciding with the axis of rotation of the clutch so that at the completion of the surfacing op eration both sides of the disk will be parallel and normal to the arbor or arbor-aperture of the disk.

Suitable means is provided for automatically reciprocating the table with respect to the rotatable clutch of the bed, and for automatically controlling said reciprocations. In addition, means are provided whereby said automatic reciprocations may be 1nanually varied both as to speed of movement and extent of stroke.

The table is provided at each side of the slot with a slide for a surfacing tool, and the control mechanism for said slides is particularly protected to prevent access of dust or abrasive particles liable to cut the adjusting screw-threads or to clog them up and interfere with proper operation thereof. Special. releasable gibs are also provided for the slides to prevent trouble from sticking thereof.

In the drawings, the numeral designates the bed of the machine, which has the guideways 26 for the longitudinally extending guide-ribs 27 on the table 28. The table is centrally slotted as at 29 to span the frame 30 which fits and is secured in the hollow or able tightening and loosening of the respective nuts and bolts in the customary manner of such ad ustments.

masses The table is provided at each side of the slot 29 with a transverse guide portion 33 for the slide 3% bearing the tool-holder 35 for tool 36 which may be of the type shown and claimed in my co pending ap ilication Serial Number 70 ,920, filed April 25, 1921:.

An adjusting screw 37, with sp' cial screw protecting devices as hereinafter described, and a hand-wheel 38 serve to adjust the tool toward and from the disk to be surfaced hereby.

As shown in Figure 1, a motor 39 is mounted adjacent the bed and is connectcd through suitable jointing with a shaft which extends longitudinally of the bed. This shaft is jouri'ialed in suitable ball or antifriction-bearings l1 and has a pinion 12- which drives the pinion 13 carried by herring-bone gear letto rotate said gear. As an alternative, this gear i l may be directly driven, as shown in Figure 5.

in either event, gear 1% meshes with the toothed periphery 241% of the two halves 15 and '16 of the rotatably mounted annulus or ring which carried the disk-supporting and retaining clutch member shown in Figure 12 and later described in detail.

The shaft a0 is further provided with a worm 17 which drives shaft L8, and through suitable speed reduction gearing t9 the countenshaft having splined thereon the sliding speedwarying sleeve 51 bearing the several pinions 52 for cooperation with the gears 53 on shaft 5% to drive the latter at varying rates of speed. Loosely mounted upon the shaft are the pair of beveled pinions 55, 56, in mesh with the beveled gear 57 on shaft 58. A clutch member 59 slidably splined on shaft 5% serves as a reverser to connect one or the other of pinious 55, 50 with shaft 5 1 so that gear 57 and its shaft 58 may be driven in either clockwise or counter-clockwise direction desired. This shaft has the pinions 6O meshing with the racks ('31 on the under side of the table 28, whereby rotation of the shaft 58 serves to move the table back and forth or reciprocate it on the bed. This reciprocation, it will be understood is at a quite slow rate of speed. but serves to gradually move the tools 36 over the faces of the disk 62 being operated upon.

Rotation of the shaft 58 may be effected either manually by use of handle (33 or automatically. The automatic control includes the shift lever G l-l having a portion engaging the clutch member 59 and an urnvardly extending portion engaging the slide block 65 on guide-rod 6G and terminating in a socket for the resiliently actuated plunger 67. This plunger is adapted to alternately seat in socket ($8 or GS) of the frame-plate to lock the lever in shifted position. It may be released from said socket by depression of control-plunger 71 which projects upwardly iuu from the franieplate as most clearly shown in Figure 8.

Mounted on the end of the table 28 is a bracket 72 while spaced from it is a second bracket- 73. These serve as supports for the rod 66, while mounted on each end of the rod between the block and the'bracket is a spring T l. its the table reciprocates, one or the other of these springs is compressed against the block and exerts its force against the lever 6%. With a spring under compression, depression of the proper plunger 71 "ill release the lever and allow it to snap over under the impulse of the spring, thus shifting the clutch member and by engagement with the opposite beveled pinion reversing the direction of movement of the table.

This releasing action is effected by the cam members 75 on arms 76. The outer arm is preferably rigidly held in position and serves to reverse the table by riding over and depressing the left-hand plunger shown in Figure l as the table reaches its limit of movement or the center of the annulus, while the supporting bracket 77 for this arm has an adjusting screw 78 for moving the other arm toward and from the first to vary the length of stroke of the table. Bolts 80 serve to lock the adjustable arm, or if desired, both arms in desired position. This rotation of the adjusting screw may be satisfactorily accomplished asby application of a wrench to the squared end 79 of the screw 78.

The machine as illustrated is capable of operation at three different speeds at the will of the operator. To facilitate control of the speeds and at the same time to simplify the structure as far as possible, I have provided an improved progressive gear shift control including the shift lever 81, rock shaft 82 and segment 83. The segment 83 meshes with the teeth of rack 8d which is slidable on the guides 85 of the main gear case cover 86. The rack has a shift yoke ST for engagement with the spool portion or groove 88 of sleeve 51, so that as the rack is slid back and forth by rocking of lever 81 and segment 83 a corresponding sliding movement will be imparted to the sleeve to progressively shift the several gears 59 into and out of engagement with respective portions of the compound gear 53 and thus to vary the relative rates of speed of the two shafts 50 and To facilitate assembly of these several parts in proper relation, the cover 86 is formed with an opening aligned. with the rock shaft 82 and of such size that the segment 83 may be applied to the shaft through said opening. In assembling, the several parts, including the shafts, gears and rack bar are first pla ed in position and the cover secured. The segment is then applied to the rock shaft with the lever in proper relation to its control segment 91 as respects the adjustinent of the rack bar and gears and the segment 83 secured. This insures proper adjustment of the shifting mechanism and gears so that the movement of the lever 81 to definite positions will cause proper meshing of the desired driving gears for the feed.

It will be noted that the table at all times overlies the bed and protects the supportin surface thereof, while the upper surface or the bed is formed with the V-shaped guideways 26 having the grooves 93 at the bottom of the V and 94 at the upper edges thereof. The guideways receive the V-shaped ribs 27 on the under side of the table, while the grooves are closed by said ribs and form oil-receiving passages. Oil reservoirs 96 are secured on the bed at the ends of the guideways and in wiping contact with the end portions of the ribs as they are projected beyond the ends of the bed during the reciprocating movement of the table. These reservoirs serve to back up the film of oil carried along by the ribs, any excess being forced upward from the reservoir into the gri'ioves )-l where it will work down to keep the entire bearing surface properly lubricated. In addition, the bottom of the groove 93 and of the reservoirs 96 serve as t 'aps for any dirt or abradant particles which may get onto the sliding surfaces or into the oil and thus reduce liability of wear of the slide surfaces or sticking thereof.

As the work to be done by the present machine frequently involves considerable friction, and to overcome any lifting tendency on the part of the table when toward the end of the stroke, I may secure on one or both sides of the bed guides 97, as illustrated in detail in Figures 17 and 18. Bracket members 98 are secured to the under side of the table and have recessed inwardly extending portions 99 underlying the guides. Antifriction rollers 100 are mounted in the recesses of the portions and project slightly thereabove to engage the under face of the guide rails and hold the table down onto the bed and against any tilting or lifting when in use.

I have previously referred to the factthat the table has guides 83 for the slides 34: supporting the work engaging tools at both sides of the slot 29. The slide 34-, as best shown in Figures 5 and 9, has the depending portion 101 formed with an annular flange 1012 providing a recess to receive the collar 103 on adjusting screw 37. To coope ate with this screw, the table has a portion 104 having a passage or bore at 105. A tubular member or sleeve 106 has an enlarged portion 107 fitting a portion of the bore and a portion of less diameter extending within the remainder of the bore in spaced relation thereto. This sleeve is secured in position as by the pin or pins 108. The free end of the lIl-U tube has suitably secured therein as by threading the interiorly threaded nut member 109 for cooperation with the adjusting screw 37.

To prevent access of dirt or abrasive material to the threads of the screw and nut, there is mounted on the screw 3'? between the shoulder 110 thereof and the portion 101 of the slide, the bushing 111 to which is secured the thin brass 1" similar material protecting tube 112 which projects along the screw in spaced relation thereto and between the sleeve 106 and the wall of the aperture 105. A collar 113 pinned to the screw 37 rotatably secures the tube and its bushing for sliding movement therewith. A screwplug 114; forms a closure for the inner end of the sleeve. It .will thus be seen, that the sleeve is sealed at one end by the plug, while the other end is at all times closed and both the nut and screw protected by the tube 112 which at all times telescopes with the sleeve interiorly and with the bore of the portion 104: exteriorly to provide an eXt-reniiely clustproof structure.

To prevent any sticking of the slide in its guideway, the ordinary onepiece dovetailed guide portion is replaced by a sectional one as shown in Figure 18. As there indicated, the slide 34.- has an integral guide portion 1.15 and a separate guide-.gib 110 secured in position by screws 117 carried by the slide and extending through the elongated slots or apertures 118 in the gib. These screws thus hold. the gib tightly against the under side of the slide but permit of relative in and out or lateral movement of the parts. To con-- trol the position of the

gib

116, 1 make use of the wedge or key m'unber 119 interposed between the guide members and 110 and having inclined or wedging surfaces engaging one or both of said parts. Secured to said key and projecting outwardly therefrom is a stud 120 having an outer threaded end 121 projecting through an aperture in the depending bracket 122 of the slide. A nut 123 is located between the bracket and the face of the slide 34:, while a second nut 12 i is engaged on the outer end of the stud. 'llightening of these nuts serves to draw the key into proper relation to expand the

parts

115 and 116 into desired relation, when the nuts may be tightened against the opposite faces of the bracket to lock it in position. In the event that the slide sticks or binds, it may be loosened by releasing nut 12% and further tightening nut 123 against the inner face of the bracket, forcing the key inward to release the gib 116. This action may be supplemented if necessary by tapping against the outer end of the stud.

T716 war s-supportiag mechanism.

As previously mentioned, the work supportlng mechanism is located in a trough or central depression in the bed and projects upwardly above the table through the slot 29 therein. It somprises an outer rigid frame, an inner or intermediate rotatable portion, dust-proof anti-friction bearings for rotatable portion, a work holding member or chuck carried by said portion, and means for properly positioning the work within the holding member.

As clearly illustrated in Figure 5 of the drawings, the outer frame comprises a pair of annular or ringlike members individually designated as 125 and 126 respectively. These members have the outer flange 12T12b, joined by the bolts 12$). lhe two frame members together thus provide a centrally open or grooved annulus into which tits and in which revolves the intermediate rotatable portion consisting of a ring formed by he union of the two members and a0. As shown in Figure 5, there is secured to each of the members 15 and 4:0 a race 130, while secured to the interior of the members and 126 are the races 151. interposed between the two sets of ball races are the ball bearings 132 which thus support the intermediate member for free rotation about its axis as well as taking up any lateral pressure thcreagainst.

inwardly of the bearings the frame and the rotatable portion have suitable dust-ciceluding devices of either to t or other pacle ing, or preferably of interlocking babbitt or other bearing metal as indicated at 133 in Figure 5 and shown enlarged at 133 of Figures 6 and 7. As shown in these Figures, there are two annular rows of this packing which serve to render the bearings proper dust-proof.

Figure 6 illustrated a form of adjustable bearing for the intern'iediate member which is capable of employment either in place of or in addition to the annular ball-bearings. it comprises a plurality of rollers disposed around the periphery of the rotatable gear member 15 46 substantially as shown in Figure 1, the member 30 having secured thereto the brackets 13 1- to support said bearings. Journaled in these brackets 184 are the trunnions 135 of the cap plugs 13 One of these plugs screws directly into one end of the bushing 137 while the other plug similarly engages the intermediate removable bushing 138 which is in turn engaged in the main bushing. Immediately interim-1y of the cap plugs in the main and supplemental bushings are the bearing-cages 1&3 for the ends of the trunnions or axles 139 of the rollers 1410 which ride on the herringbone teeth of the member l5al;6. lluts 141 retain the cages on the ends of the axles, while the caps serve to retain the bearings as an entirety in position.

To further aid in exact positioning and retaining of the rollers independent of the llli bearings as respects lateral movement, the main and supplemental bushings are formed with the cooperating inwardly projecting or opposed flanges 1: 2 engaging the opposite ends oi the roller. It will be noted thatthe engagement of the flanges is controlled by inward screwing of the supplemental bushing 13S, and that by removing the brackets and end plugs the balhheari gs may be removed, while it is n cessary to also remove the supplemental b hin g ne'lore the roller itself can be removed from proper position in the bushing.

Attention is invited to the fact that the main bushing is eccentrically bored tor the cap and supplemental bushing. so that the roller is held in eccentric relation thereto. This is to provide for adjustmentoi the bearing 01 the roller on the teeth 211 at the carrier gear, in that turning 01 the device as an entirety as by application of a wrench to the projecting ends of the trunnions 1235 will shift the axis of rotation oi? the roller 140 inward or outward as desired. T o lock the parts in desired position the hubs 1 1-3 on the brackets for the trunnions are provided with set screws 14% which lock the trunnions against accidental movement.

To most thoroughly enclose the parts against access of dust and abrasive particles. I preferably enclose the caps, bushing and contained parts by the sleeve le which fits within the brackets and their flanges 1 16, said sleeve being interiorly cutaway in the portion enclosed by the main frame to permit the roll 1-10 to project into supporting engagement with the *im of the rotatable member LIP-46.

When the annular ball-bearings and the rollers are both employed to support and position the rotating member, the only function of the habbitt or likc material is to exciudc dirt. Even in that. 'nstance, it is desirable to have some in Pans of relatively adjusting the packing or scaling substance and the rotating member to facilitate proper assembling and litting of the parts. Should it he desired to eliminate the ball-bearings, this adjustment then becomes of primary importance. A preferred term of attaining this result is shown in l igure T. The packing or hearing material 133 is carried on one or both sides in a ring or segment of a ring 117 litting in a groove in the inner face of one of the members l25126. Said member is tapped to engage the adjustingplug 148 which has a reduced end 1 1-9 projecting into the groove and lilting a counersink or recess in the outer face of the ring 1 17. This end holds the ring member against rotativc or sliding movement and at the same time tightening of the member 1% serves to force the ring toward the intermediate rotating member to insure a proper lit between the parts and take up any possible loosencss or side play. The plug is centrally drilled and countersunk for the lock-screw 150 which is tapped into the member 1-17 beyond the end 1 19 of the plug. 'lightening oi? this screw serves to lock the parts in inwardly adjusted position.

The work-chuck.

It will be noted by reference to Figure 5 that the member #15 has a flange extending inwardly ot' the member 16 while secured to this flange as by the bolts 151 is the outer ring or shell of the work-holding chuck. This shell has titted thereinto the cam ring 153 having seats for the jaw actuating cams 15-1- and has a rack portion A gear 156 is journaled in the shell in mesh with the rack to impart an oscillatory movement to the ring, while a pinion 157 meshes with the gear and has a squared hub 158 for engagement by a suitable wrench or key to rotate the latter and thus shift the cam ring. A plate 159 forms the closure for the other side of the shell, which is formed with inwardly directed apertures 160 enclosed by guide flanges 161. These flanges serve as guides for the chuck jaws 162. Said jaws are centrally keried to receive the rollers 163 which ride on the cams 154 and force the ja inward into clamping engagement with the work. To prevent disengagement of the jaws and to retract them when the cam pressure is released, I drill in the shell at the side of the jaws the sockets 16 1 into which project laterally the pins 165 carried by the jaws. Resting on the pins 165 are the washers 166 affording a. proper bearing for one end of the springs 167 whose other ends engage the plugs 168 which form the closures for the apertures. Outward actuation of the aws through the pins and wash ers compresses the springs, while the expansion oi the springs on release 01 the cams serves to withdraw the jaws from engagement with the work being surfaced. Also, the springs, when completely compressed by their cnggement with the pins limit the possible outward movementof the jaws unless the retaining plugs 168 are removed.

l'Vorie positioning mechanism.

As the present machine is adapted to operate upon both sides of a disk simultaneously, and to produce pa 'allel surfaces on the disk, it is particularly desirable that the disk shall initially be properly lined up in the machine. That is to say, for most rapid production, and to obtain the best resultant product, the central plane of the disk at right angles to the axis thereof should be placed in the machine to correspond with the similar plane of the rotating carrier and all possibility of twisting of the disk eliminated.

In the accomplishment of this result a plurality of mechanisms are employed, each capable of independent use in some instances, but in others co-operating and coacting together in the positioning of the disk. These include means for centrally engaging a bushed disk and means for laterally engaging one face 01" the disk, the latter cooperating with the center engag means in the case of unbushed disks.

Figures 15 and 16 may be considered as a starting point for consideration of the positioning means, in that they illustrate the construction of an ii'nproved centering arbor. This member COI'DQl'lSQS the arbor proper 165) having the sockets 170 in the ends on its axis for positioning thereo't. 'lhe arbor is fur-- ther formed with the series of circumferentially extending" grooves or markings 11 1 progressively spaced predetern'iined dis tances trom the center-nuuk 172. Longitudinally extending ii'iai.'l'-:ings 1'13 transverse the circumte cntial markings and at the intersections of the two are to med in an advancing spiral the recesses or countersink; 17 1-. These recesses 174: are oi? depth to properly receive the lower pointed end of the set screw 175 carried by the sleeve or collar 176. This collar is slidably mounted on the arbor and adapted to be secured in desired adjusted position thereon by engagement of the set screw in one oi? the sockets 17-1. it is provided with an mitwardly extending pe ripheral flange 1?? adapted to engage the central portion oi? the face ot a disk to be surfaced. lt will. ot course be understood that the mechanism here described is em ployed only when the disk in question has a central hole or a 'ierturo which will receive the arbor, and that in practice a number of diilerent arbors are employed to litthe dil terent sizes of apertures which the disks may have.

lllach ot the longitiuilinally et tcnding marhngs 173 s provided with an e onent,

such as the do? nation if; as shown i i igure 16. This ezizponent denotes the thickness oi? disk which will be properly centered on the arbor when the screw is engaged in the socket 174 intersected by that particular line. As previously mentioned, the arbor has the center line 172 which is intended to coincide with the center oi thickness of the disk. The several lines 171 are then spaced desired distances, as for erzan'i 'ile, every -fi oi an inch, so that shitting the screw "from one socket to the next will entail a movement of the collar longitiulinally of the shaft onesixtcenth or an inch. This will serve to properly center a stone one-eighth of an inch thicker than the previous setting. In either event it will be understood that the stone or disk is brought into tight engagement with the flange 177 as shown in Figures 15 and 16. Cl he distance from the screw to the end of the collar is preferably so calculated that when. the screw is in engagement with the socket at a concealed annular line, the edge of the collar will just coincide with one of t 1e other parallel graduations. Each of the circumferential markings thus serves both as a locus for a socket and as a guide in lining up the collar with the set screw thereof in position to be easily engaged in the de sired socket.

The correct circum'lerential positioning of the screw is determined by the line 173 which bears at its outer end the measurement 01 stone which will be centered it the screw is engaged in the socket intersected by that line, this measurement being double that of the actual distance from the center designation on the arbor to the taco ot the flange 1'77.

To support the arbor and workpi ce in the machine prior to the engagement of the chuck jaws with the work, i make use of the siu'iporting and positioning devices particularly illustrated in Figures 2 and 3. Suitably bolted to the frame 30 are the brackets 1T8 supporting the bearing 179 for the rocksha't't- 180. This shaft has secured on its ends the positioning arms 18.2 which depend in yoke-like relation at the sides of the frame 30 and have their lower portions when in vertical position as shown in Figure 1 in alignment with the axis 01 the frame. The arm 182 bears a. stationary center point 183 for engagement in one ot the sockets 170 of arbor 179, while the other arm 181 has means for resiliently engaging the arbor but which may be disengaged to release the arbor as desired.

Said releasable mechanism includes a tubular end 18-1 having slidably mounted therein the bushing 185 formed with trunnions 186 projecting outwardly through the slots 18? in the portion 184-. A. center point 189 similar to the point .183 has a tapered shank fitting within the bushing. while the rear of the bushing is reduced to form a. shoulder 189 and receive the actuating spring 190. The other end o't this spring bears against the plug 191. it screw or pin 192 is slid able through the plug and has its ends secured to the bushing to "term a guide therefor and limit its movement as influenced by the spring, as is clearly illustrated in Figure 3.

To retract the center point .188 for inser t-ion or removal of a work supporting arbor, l mal ce use oi? the lever 193 wh'ch is pivotally engaged on one of the trunnions 186 and has an cccentrically curving slotted head 19s. A pin 195 projecting laterally 'tron'i the portion 18% is engaged in the slot of the head of the lever, so that as the lever is rocked on its pivot trunnion the action of the pin and eccentric slot will draw the trunnion and thus the bushing 185 and point 188 toward the left or into retracted position, so that there is sufficient space for disengagement or reception of an arbor 169. The position of the arbor when held by the points is shown in Figure 2.

In some instances the fit between the disk or stone forming the work-piece and the arbor is suiiiciently satisfactory so that no other positioning means are required. In that event, the arbor being properly support-ed by the

arms

181 and 182, the chuck jaws are forced inward to secure the work in place, it being understood that the disk is firmly pressed against the flange 177 of collar 176 during the clan'iping operation. By retraction of point 188 the arbor is then released and may be slightly shifted to disengage it from the other centering point 183, when the arms may be swung to the position indicated in the dotted lines of Figure 1 and secured in that position by tightening of the clamp screws 196. The arbor can then be withdrawn and the surfacing operation commenced.

In those cases where the arbor does not suti'iciently accurately position the disk, or if it is not possible or desirable to employ the aroor, as when the disk has either no aperture or an irregular one, I may make use of the positioning member shown in Figure 4. This member comprises a skeleton or frame having an outer ring 197 of size to just fit within the frame and hinged thereto as at 198. Extending inwardly from this ring are the radially arranged spoke members 199 which stop a distance from the center and are connected by the segment 200 having an opening at the side toward the tool so that the surfacing operation may be performed without removal of the device.

The arms or spokes 199 are provided with the adjustable contacts 201 which project inwardly from the spokes to 'contact with the face of the disk being mounted and by their engagement therewith at a plurality of points insure proper alignment thereof with respect to the machine.

The ring 19? also carries the latch 202 for engagement with the keeper 203 on the frame 30. This keeper has suitable notches or the like for selective engagement with the latch so that the ring may be locked in tight engagement with the frame for positioning of the disk to be surfaced, or may be engaged with an outer portion of the keeper. For this engagement the ring is swung outward about its hinge a suflicient amount so that none of the contacts bear against the disk, when the surfacing may be performed without; entire remo *al thereof, the surfacing tool, as aforesaid passing into and out of the frame through the gap in the inner segment 200.

It will be understood that to take care of diti'erent thicknesses of disks, the contacts 201 may have either an in and out screw adjustment, may be removably fitted in place and interchangeable according to the distance from the positioning frame that the surface to be operated upon is to be located, or the frame as an entirety may be removed and a different; one substituted.

In any event, the disk is pressed from the front of the machine against said contacts and the chuck jaws tightened to retain it in place, the use of three chuck jaws making them substanially self-centering as respects the work held thereby, altho other positioning may be attained either by the employment of adjustable jaws or the use o t interposed shims should it for any reason be desired to eccentric-ally locate the work in the chuck.

From the foregoing description taken in connection with the accompanying drawings the construction and operation of the several parts of my improved surfacing machine for disks, abrasive wheels or the like should be readily understood. It will be seen that I have provided an extremely durable and satisfactory machine in which all the moving and working parts are pro tected from dust and abradent particles which would tend to wear the contacting surfaces or clog them and cause sticking of the parts in use.

It will further be noted that by the use of my machine the work may be readily positioned with extreme accuracy and by positioning means which form a part of the machine in constant predetermined relation thereto and which may be easily shifted into operative position to engage the work or moved out of the way to avoid interfering with the surfacing operation.

Especial attention is invited to the fact that by the use of my improvement at very heavy workpiece such as a large abrasive wheel may be securely held and satisfac torily supported for free rotation upon du rable, adjustable autifri(-lion bearings.

Also that said bearings are fully encased and protected from the action of the abrasive particles removed during said surfacing operation.

In addition, through the employment of my improvements it is possible to employ a positive gear drive for the rotatable work holder, and to protect the gear teeth against clogging or rapid wear and to satisfactorily steady the rotatable work supnort to prevent chattering of the gearing thus employed or jumping of the work under the heavy service conditions and requirements of the surfacing operation.

Also, through the employment of my improved mechanism these advantages can be attained and at the same time the two sides ously to produce parallel finished surfaces in minimum time and through the use of a single feed mechanism for the tool members, said feed mechanism being adapted for automatic control, reversal, etc., through the use of simplified and improved adjustable controlling devices.

I claim:

1. A surfacing machine of the character described, including a bed, an annular frame mounted on and rising from the bed, a workholder rotatably supported by the frame, said worlrholder having a geared portion enclosed by the frame, and. driving means in chiding a pinion n'icshing with the geared portion and enclosed by the fran'ie, whereby said means serve to rotate the workholder and the frame protects the gear and pinion portions fron'i work-particles removed. during the surfacing operation.

A machine for use in surfacing abrasive wheels, including a bed and an annular frame mounted thereon and rising therefrom, an. annular workholder having a geared on edge mounted in the frame, antifriction means interi'i'iediate the fran'ie and workholder to facilitate free rotation of the latter, driving means jomrnalcd in the frame and including a pinion meshing with the gear of the holder, and interlocking means on the frame and holder to exclude access of abrasive particles from the work to the gearing and the antifriction means.

3. In a surfacing machine, the combination with a supporting frame, of an annular workholder having a peripheral herringbone gear formed thereon, and supporting bearings for the workholder in the form of rollers carried by the frame and riding on the surface of said. gear. l. in asurfacing machine, the combina tion with a supporting frame, of an annular workholder having a peripheral gear formed thereon, supporting bearings for the Workholder in. the form of rollers carried by the frame and riding on the teeth of said gear, and means for adjusting the position of said rollers with respect to the frame whereby their pressure against the workholder is varied.

In a surfacing machine. the combina tion with an annular supporting frame, of a workholder rotatably supported thereby, said holder having a peripheral driving gear, antifriction bearings holding the holder within the frame with the gear in spaced relation thereto, said frame having an offset POI'illOU, a drive pinion in the offset meshing with the gear, and means operating the pinion to rotate the gear.

6. In a surfacing machine, the combination with a supporting frame having an innor annular guideway and an offset pinionreceiving recess, of a workholder rotatably mounted within the guideway, ball-bearing supports carried by the frame and having portions engaging the holder, and adjustable packing members carried by the frame and laterally engaging the workholder, substantially as and for the purpose set forth.

7. In a surfacing machine of the character described, the combination with a support, of a frame carried thereby having an annular trackway, a workholder rotatably mounted in the trackway having means for peripherally engaging a workpiece, and means on the frame shiftable into position to laterally engage and position a workpiece when in the workhold-er.

8. In a surfacing machine of the character described, the con'ibination with a. support, of a frame carried thereby, a workholder rotatably mounted within the frame, said workholder including radially slidable jaws for engaging the periphery of the work, and means pivoted to the frame and projectable into and out of position to laterally position the work prior to the engagement of the jaws therewith.

9. In a surfacing machine of the character described, the combination with a support, of a frame carried thereby, a workholder rotatably mounted within the frame, said workholder including radially slidable jaws for engaging the periphery of the work, a ring slidably mounted within the workholder having individual cam portions for the several jaws, and means for shifting the ring with respect to the jaws to force the latter inwardly.

10. In a surfacing machine of the character described, the combintion with a support, of a frame carried thereby, a workholder rotatably mounted within the frame, said workholder including radially slidable jaws for engaging the periphery of the work, a ring slidably mounted within the workholder having individual cam portions for the several jaws, means for shifting the ring with respect to the jaws to force the latter inwardly, the holder having sockets formed therein adjacent; the jaws, and means in the sockets operatively connected with the jaws for retracting the jaws when the cams are shifted into releasing position.

11. In a surfacing machine of the character described, the combination with a support, of a frame carried thereby, a workholde-r rotatably n'iounted within the frame, said workholder including radially slidable jaws for engaging the periphery of the work, a ring slidably mounted within the workholder having individual cam portions for the several jaws, means for shifting the ring with respect to the jaws to force the latter inwardly and to release them, the holder having sockets 'formed therein adjacent the jaws, the walls of said sockets having slots at the jaw sides thereof, pins on the jaws projecting through the slots into the sockets, and springs, in the sockets having ice one end engaging the workholder and the other the pin for retracting the pin and thus the jaw when the cam ring is shifted into releasing position.

12. In a surfacing machine, the combination with a bed, of a workholder and a toolholder supported thereby, and means for advancing the toolholder in the direction of the workholder including a slidal'ile support for the toolholder, a guide for the support having an interiorly threaded sleeve, an adjusting screw on the support interiorly eugaging the sleeve, and a prolecting tube can ried by the support and enclosing the screw in spaced relation thereto, the sleeve having sliding fit with the interior of the tube, whereby the tube prevents abrasive particles from the workpiece being surfaced entering the threads of the adjusting screw and the sleeve.

13. In an abrasive wheel surfacing ma chine or the like, the combination with a table having a guide, of a tool slide movable over the guide, a sleeve member secured to the table and projecting adjacent the guide. said sleeve having an interiorlv threaded portion, an adjusting screw on the slide engageable with the threaded orl'ion of the sleeve, and a tube carried by the slide and having a sliding fitwith the sleeve, said tube being rotatably mounted on the screw, substantially as and for the purpose described.

14. In a machine of the character described, the combination with a workholder, of means for positioning the work within the holder, said means including an arbor positioning device and an arbor, an abutment member adjustable on the arbor, and means for securing the abutment member in proper position on the arbor to center a given thickness of workpiece.

15. A work positioning device of the character described, comprising an arbor having a work-piece center designation and having longitudinally spaced therefrom a series of transverse markings and intersecting longitudinal markings,there being sockets formed at the intersections of the markings in an advancing convolute curve, and a workpiece abutment member slidable on the arbor, said member having a locking device for selective engagement in the sockets.

16. A work positioning device of the character described, comprising an arbor having a work-piece center designation and having longitudinally spaced therefrom a. series of transverse markings and intersecting longitudinal markings, there being sockets formed at the intersections of the markings in an advancing convolute curve, a work- 'Jl'GCG abutment member slidablc on the aror, and guide and locking members on the abutment so spaced that they will simultaneously aline with spaced transverse markings on the arbor, whereby the guide portion of the abutment facilitates lining up of the locking member with a desired socket.

17. In a machine of the character described. the combination with a supporting bed, of a workholder carried thereby, and positioning means for the work comprising a frame hinged to the workholder and adapted to be swung into position to laterally engage the work, said frame being open at one side to facilitate access of a tool to the workpiece without removal of the frame.

18. In a machine of the character described, the combination with a supporting bed, of a workholder, a supporting frame therefor mounted on the bed, said workholder including jaws for peripherally engaging a workpiece, and means on the frame of the workholder for laterally engaging and positioning the workpiece within the jaws, said means including a frame movable toward and from the workpiece, and contacts on said frame for lateral engagement with the workpiece at spaced points thereon.

19. In a machine of the character described, the combination with a supporting bed and a workholder frame rising therefrom, of an annular chuck member rotatably supported by the frame, and means on the frame for axiallv centering aworkpiece with respect to the chuck, said means including arms pivoted to the frame having center points alignable with the axis of rotation of the chuck when the arms are swung in about their pivot, and means for retracting one of siad points to permit of introduction of a positioning arbor therebetween.

20. In a machine of the character described. the combination with a supporting bed and a workholder frame rising therefrom, of an annular chuck member rotatably supported by the frame, and means on the frame for axially centering a workpiece with respect to the chuck, said means including a rockshaft journaled in the frame parallel with the axis of rotation of the chuck, arms carried by said shaft and movable by rocking of the shaft into and out of the common plane of the axes of the shaft and chuck, and centering devices carried by the arms in position to align with the chuck axis when the arms lie in such common plane.

GUSTAF A. OLIN.