US871964A - Buffing-machine and disk-holder therefor. - Google Patents

Description

PATENTED NJOVLZG, 1907.

G. F. STEWART.

BUFFING MACHINE AND DISK HOLDER THEREFOR.

APPLICATION FILED SEPT. 12,1966.

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Y IATENTED NOV. 26, 1907. G. F. STEWART.

BUFFING MACHINE AND DISK HOLDER THEREFOR. v rum-no.1: rnsn 31:21.12, mos. v

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Fig '2- witzasssr I by M (405% No. 871,964. PATENTED NOV. 26, 1907.

. v G. F.- STEWART. BUPFING MACHINE AND DISK HOLDER THEREFOR.

A PPLIOATION FILED SEPT-12,1906.

3 BHEETB-BEEETsS.

UNITED STATES PATENT, OFFICE.

GEORGE F. STEWART, OF LYNN, MASSACHUSETTS, ASSIGNOR TO MANUFACTURERS MACHINE COMPANY, OF MONTOLAIR, NEW JERSEY, A CORPORATION OF NEW JERSEY.

BU' FFING-MACHINE AND. DISK-HOLDER THEREFOR.

Specification of Letters Patent. i Patented Nov, 26, 1507.

Application filed September 12. 1906 Serial No. 835211.

To all whom it may. concern:

Be it known that I, GEORGE F. STEWART, a

v citizen of the United States, and a resident of Lynn, in thecounty of Essex and State of Massachusetts, have invented an Improvement in Buffing-Machines and Disk-Holders Therefor, of which the following description, in connection with the accom anying draw- Naumkeag machines, which are distinguished by the fact that the buffing pad is of approximate disk shape and rotated about a vertical axis at the center of the disk, contradistinguishing these machines from those employing buffing rolls about which the abradant material is secured.

Roll machines are commonly employed to operate upon the bottoms of fore parts of boots and shoes, while the Naumkeag machine is more generally used for what is termed shanking out or finishing the shanks, for which it is better adapted owing to the fact that the disk pad employed permits the buffing to be carried down closer to the breast of the heel and into the concaved breast, whereas with the roll the bufiing.

could be carried no nearer to the heel than the length of the radius of the roll.

My invention contemplates the use of a plurality of spindles upon which the abrasive pads or disks are mounted and'an improved adjustable holding device for one of the disks which will permit the operative to remove a worn disk and apply a fresh one while the machine is in operation, so that the work of the operative is not delayed by his having to stop the machine in order to change the disks.

My invention also contemplates the use of an abradant disk having structural means to permit it to be easily and erfectly centered and secured by the hol ing devicein operative position. The above, however, with other features of my invention will be best understood and appreciated from a description of the same in connection with one embodiment thereof shown in the accompanying drawings.

Referring to. the drawings: Figure 1 is an elevation of the left side of a machine embodyin one'form of my invention and selected or illustrative purposes only; Fig. 2,

a plan thereof; Fig. 3, a-verti cal sectional detall of the novel holding device, showing the annular abradant'diaphragm secured in op erative' position with the means for operating said device; Fig. 4, a vertical sectional detall taken on the roken line 4-4 of Fi 3; and Fig. 5 is a bottom viewof the abradant diaphra m or pin wheel 19 in place upon its spin le and'to show the clamping jaws spread apart in diaphragm securing position.

Referring to the drawings, in theparticular embodiment of my invention selected for illustration herein and shown in said drawings, a column 1 (see Fig. 1), of suitable shape and construction to support the working parts, is provided at its upper end with a head 2 (see Fig. '2) of approximate Y shape, the stem 3 of said Y extending reari wardly and its two horizontal arms, 4, 5, extending forwardly toward the operative. In the present instance, a (plurality of disk or pad s indles is employe here shown as two, in icated b reference numbers 6 and 7 upon the 'rawing and respectively a mounted at the outer ends of sai arms 4 and 5, one ofwhich may be of any desired or usual construction but the other, herein shown as the spindle 6, is preferabl of a different construction presentl to e described. Each of these spind es is driven by a grooved pulley 8, the two pulleys being driven by a common belt.9, passed around an idler 10 between the arms of said Y, about the two pulleys at the ends of said arms, thence rearward between two idlers 12, to go over a pair of vertically arran ed idlers 13 journaled in the forked rear en of the stem 3 of said Y' shaped head 2, and thence downward at the rear of the machine to and about, a drivin ulley 14 fast on a drive shaft 15 j ournafed in bearin s at the base of said column. Said drive s aft 15 may be driven by any suitable means but preferably as herein shown by fast and loose pulleys 16 and 17, adapted to be suitablyconnected with any convenient source of ower.

The s indle 7 is provided with the usual type of Klaumkeag ufiing pad (not shown) adapted to buff and finish the shank and also the ball, which latter has been previously grained upon the usual roller buffer.

The spindle 6, referred to, is provided with a pad having an abradant' cover of what is known as the pin wheel t e, that is, a flat annular disk or diaphragm. aving one of its faces' coated with abradant material, sandpaper or emery cloth usually being emsuitable bearings fdrmed at the front end of said arm 4, said spindle receiving interforming a seat concentric with the axis of the support for the agamst its lower face and to justable sliding tubul mediate said bearings and their bushings, the horizontal-drive pulley 8 by which it is rotated and which also prevents vertical dis placement of the spindle in its bearings. This spindle vided at its lower end with a flanged dis 22 spindle to receive an annular frusto conical s terial, which is secured ereto by any suitable means'as by screws 18*- (Fig. 3). By roviding a pad of this shape its tapered or beveled edge beingmore resilient than the body of the pad, permits it to ada t itself to the variable contour of the sha or other portion of. the sole operated upon, so that all portions thereof are abraded or buffed.

In order to make the s indle bearings dust proof, suitable sleeve li e caps23 are. provided which-are mounted on said spindle 6 to inclose the exposed ends of said bushings 21.- Each of these caps, moreover, is provided interiorly with suitable packing material such, for example, as split rings or washers of felt or'the like, these rings 24 filling the s ace between the spindle, the

ends of said ushings, and said caps, and co- 4;) operating with the latter in preventing dust from reaching the bearing surfaces. The annular disk ad 18 forms a yielding ar abradant diaphragm 19, clamped which theshoe bottom is presented to be buffed thereby. As this diaphragm wears out after a reasonable amount of use and as, furthermore, it the quality of abradant material employed, as from coarse to fine or vice versa, said diaphra is removably secured to its spindle,

' and t at no time maybe lost in changing the diaphragm,-means are provlded for clamping or uncla'mping it, so thatit ma be secured to and removed from the spin le 'with out stopping the'maohine. To this end, the spindle is provided with an adjustable hold ing device easily 0 erated by hand for clamp-1 ing andreleasmg t e diaphragm and the latter is also formed to adapt it to cooperate there- .with-infacilitating the operation of ap lying :it to' or removing it from said holding evice.-

In order to mount the holding device, re-

ferred to, within the spindle, the a instance, with an advided, in the present a1 shaft 25, screw 6 is of tubular form and is roaped pad- 18, preferably1 of felt or like maeach of these is also desirable to change- 3) and the lower end of said shaft 25 1s centter is proerases threaded at its upper end to engage correspondin screw threads formed interiorly at t e hea of said spindle 6. For convenience in turning-this shaft'25 to mo ve it vertically in said spindle 6', its head is rovided with a lateral openin a purpose lock it fir 25 projects above the up dle 6 and receives on its threaded end the clampin nut 26 ,-the periphery of which also 1s provi rotating it and clamping or looking the slidable shaft 25 in any desired adjusted position. This shaft 25 receives within its central bore a slidable rod 27, pivotally carrying at its lower end a pair y in adjusted position said shaft jaws 28,-the .upper .ends of which together In the present emembrace said rod 27,.

ed with usual pin hole openings for or pin hole, Fig. 3, to receive a key or points instrument by which it may be adjusted to a desired vertical position, forresently made more clear. To

per end of said spinof vertical clamping i I bodimentof my invention and as herein shown (see Fig. 3), each of these jaws is provided intermediate its with a laterally and inwardly extending ear ends and at one side or hub 29 fitting with a recess of corresponding shape in the edge of theia'djacent jaw, said ears receiving a horizontal pivot stud 30 carried-at the lower end of saidrod 27 and by which said jaws are pivotally connected therewith. These jaws operate as levers adapted to swing back and forth on their 'ivot pin 30, the inner opposing faces being niclined outwardly both above and below the pivot point so that either the upper orlower arms of said lever jaws may be swung toward oneanother until limited byengagement with said rod 27 at their upper ends, or by the opposing brought together vers are provided with curvilinear or senueyhndrical surfaces adapting them to embrace or receive the lower end of said rod 27 between them and to slide freely in the lower end of said s indle 6.

evers is tapered as at 31 (Flg.

faces of said leversfbeing below said pivotal point-g The outer. and inner faces of both of these le M The upper arm of the levers carried thereby are elevated. In

the upward vertical movement of said levers within the tubular shaft 25, the ta ered ends of theirupper arms first engage t e bottom at the 'lower'end of said shaft 25, as an inwardlyinclined wall 34, so

that as said arms slide upward in said'rec'ess 1 said ends will strike against said 'wall 34 -and be moved toward one anotherthus to sepa-' rate the clamping ends of the lower arms for forming an inturned lip? on said diaphra m, to'be described later. orclamping the iaiphragm in position the lower arms of these evers;v 28 are prov ded atthelr outer or lower sum Y ing heads 35 (Figs. 3 and 5), forming the clamping jaws proper, which with said levers constitute a spreadindginhead for the rod 27 for centering and hol g the abradant diaphragm 19 in operative position on its suporting pad 18. These clamping jaws are rought together or separated to expand or \i collapse said head by moving said rod 27 in opposite directions. The annular dia hra m 19, best shown in Fi 5, is provide wit a centralopening 36 0 sufficient diameter to permit said se ental she ed heads 35 to pass through w on they are rought together 1n depressing said' rod .27. For bringing these clamping jaws together, or to express it differently, for collapsing the spreading head, the lower arms of the levers 28.are provided with a circumferential or peripheral groove 37, to receive a coiled spring 38 which normally acts to swing said arms toward one another. This movement, however, is only permitted by depressing the said levers sufliciently, through the depressiouof their car-- rying rod 27, to bring the upper ta ered armsof said levers into the lower and larger end of the tapered recess, which permits said arms to separate. When thus depressed (see dotted linesbottom of Fig. 3), the said heads 35 together form a button of ap roximate elliptical sha e (see dotted lines ig. 5) the minor axis 0 which is substantially ofthe same diameter as the opening in said diaphragm 19, so that the latter can be placed and centered thereon and said clarnpim jaws 35 operated within the'annulus of sai diaphragm. 'The outer lateral edges of said heads 35 are inclined or beveled inwardly as at 39 (Fi 3) and the shouldered flange 22 of said spin le 6 is provided Witha tapered bot tom recess of converse shape to receive said heads and'to constitute a seat for the inner edge of said diaphra m.

The thickness of the annular pad 18 adj acent its central opening is such that the lower end of the spindle does not extend below the surface of the pad, so that the latter forms a yielding support for the inner edge of the active face of the pad. The lower arms of said levers 28 and the clamping jaws proper at their lower ends are adapted to be separated to engage the inner edge 41 of the annular diaphragm 19 and draw and bend it inwardly into contact with the inner lower edge 42 of said pad 18 and clamp it against the inclined face 40 of the spindle recess or seat, said yielding edge 42 eoi'iperating with the clamping action of said heads 35 in preventing rotation of the diaphragm independently of its spindle.

'lo adapt the levers 28 to receive on their lower ends, constituting the collapsed clamping headof said rod 27, a diaphragm having a sompwhat smaller central opening than that shown in Fig. 5 for properly centering the same thereon during theclamping action, their lower ends are notched or cut away at one side. To depress the rod 27 and thereby said levers 28, to move them and the clamping aws proper into the position indicated in dotted lines Fig. 3, in which a diaphragm ma be easilyremoved or applied, the upper earing 20 of said spindle 6.

is provided with a bracket 43. (see Figs. 3

and 4) secured thereto b any suitable means, as by screws 44. t its head this bracket is provided with a rearwardly extending yoke 44, upon whichis pivoted a suitable operating lever 45, the opposite end of which extends forwardly into a convenient position for manipulation by the oper' ative. This lever is provided with a longitudinal recess 45 to receive a block 46 pivotally mounted therein by inwardly projectin pivot screws or studs 47.- At its center thls'block is provided with a vertical recess to\receive and permit the rod 27 to slide freely therein.- To limit the vertical movement of this operating lever and said block 46 so that the latter will elevate or depress the rod 27 with it, the upper end of the. rod is rovided with a collar 48 secured thereto, w 'ch is adapted to be engaged by said block 46 Whensaid block is elevated. Immediately below said block, said rod is similarl provided with a collar 49 to be engagedlby said block when the lever is depressed, thereby to depress the rod 27 and the clamping levers 28 carried at the lower end of said rod, so that their upper ends may he slid downwardly in the tapered recess 32 at the end of the shaft 25 to permit them to separate under the action of their spring 38for bringing said heads 35 together which, as described, permits the diaphragm 19 to be removed or applied. The bracket 43 isalso provided with a forwardly extending arm 50 having a vertical opening 51 therein, to receive the lower end of the collar 49 when it is depressed by the downward movement of said rod and guiding said collar and its shaft vertically to center it relatively to the shaft 25. The flanged head of said collar 49 is adapted to en age the upper face of said arm 50, to limit t e vertical depression of the rod and its jaw levers 28 so that said collar'cannot be brought into contact with the head of the shaft 25, to inter few with its rotation. By this arrangement said rod is always in position to be acted upon by the operating lever when it is desirable to change the diaphragm.

As the outer end of the operating lever 45 would normally fall by its weight until its block 46 is rested upon the collar 49 carried by said rod 27, and, hence, by the rotating spindle 6, means are provided for normally maintaining it in a position between the upper collar 48 and the lower collar 49 so that it normally engages neither and thereby does not operate to interferewith the r'otation of said collars or to produce unnecessary wear thereof. While any suitable means may be emplo ed for this purpose, I prefer- 5 ably provide t 1e left side of said handle with a laterally projecting lug 52 (see Figs. 3 and for clamping a new diaphragm in place, the lug 52 on said arm bending the holding spring 53 outwardly until the engaging lug 52 of said lever isflelevated above the inwardly bent portion of the spring, when the spring immediately springs in to its normal position. The operating lever may then be released and permitted to fall by its own weight until arrested by the engagement of said lug 52 with said spring and is normally supported in the intermediate position re-, ferred to.

When the operating lever is depressed, in applying or removing a diaphragm, the block 46 frictionally bears upon or engages the col.

lar 49 and as the clamping jaws simultaneously release the diaphragm 19 rotation of the rod and of said jaws is ordinarily prevented during this operation.

To provide for slight variations both in the thickness of the pad 18 and said diaphragm 19 and also to provide for varying the clamping action or spread of the clamping jaws, the tubular shaft 25 may be adjusted vertically as described. By raising or lowering this shaft, the action of the tapered recess on the tapered arms of the levers 28 respectively produces less or greater separation of the clamping faces of said heads 35 thus to vary the clampin action on the interposed inner edge of the 'aphragm.

Any suitable means may be employed for conducting away the dust produced by the abrading action of said pin wheel disk 19 and the bufiin disk mounted uponthe opposite spindle 7, mt in the present instance, 1 preferably provide conduits or suction lines. 54, 55, respectively, the inlets or mouths of which stand directly in the rear of the s indle disks and as close thereto as possible without interfering with the presentation of the work thereto. At their inner ends these two conduits join or merge into a single conduit 57,

which (see Fig. 1) extends down within the column and its outlet at the side of the col? umn, being controlled by a damper 58 (see dotted lines Fig. 1), shown as connected by a rod'59 and bell crank 60 to the shipper rod 56 (Fig. 1). As here shown, this shipper is piv- .mits the operating lever to be again elevated otally mounted adjacent the, base of the colum and controls the belt that runs upon the fast and loose pulleys 16 and 17, and by which they are operatively connected with a convenient source of power. The outlet. of this suction flue is adapted to be connected with a central exhaust fan (notshown) adapted to operate a large number of machines so that upon opening the damper in the outlet the suction lines of each machine are operatively connected with. this central fan, thereby to remove the dust produced in the bufiing operation. 'By connecting the damper with the shipper the damper is respectively closed and opened u on starting and stopping the machine. l eferring to. Fig. 1, the machine is shown as also provided with a cleaning brush 61, mounted upon its shaft 62, journaled at its ends in the sides of a protecting hood 66 extending from said 001- umn 1 and connected with the main suction v 57 of the machine. This shaft and. the brush 2 carried thereby are rotatedthrough a ulley 63 secured exteriorly upon said shaft and. connected by a belt' 64 with, a pulley 65 on the shaft of the idlers 13 The machineis operated as follows: The operative will usually'presen't the bottom of ashoe to the action of the pin wheel or abrad' ing diaphragm 19 and clean out and grain the shank and heel of the shoe to preliminarily buff the same, after which the buffing opera tion is completed by presenting the shoe to the rotary pad-on the opposite spindle 7 and subsequently cleanin and dusting it by means of the rotary b sh 61. When a new or different diaphragm is to be applied, the operating lever is depressed, stopping therotation of said rod 27 and depressing it to cause its collapsible head to contract to form 105.

the button like head shown by dotted lines in Fig. 3. In this position the old diaphra 111 .may easily be removed over said head ant a new one placed upon it. The operative next raises the handled end of the o erating lever 1 101 to bring the tapered portions 0 the levers 28 into operative contact with the recess 32 causing them to move toward one another and to separate the clamping jaws at their opposite ends. By this movement the dia- 115 phragm is properly centered and its inner edge bent inwardly to form a central lip clamped by said jaws into the seat at thelower end of the spindle which forms a stationary cooperating clamping member for said jaws to clamp against for securing the dia hragm firmly "in position and so that it wil be rotated positively'with said spindle. As the diaphragm is secured in place it is 1'0- tated by and with said spindle, when the opcrating lever may be released and held out of contact with the rod 27 which is rotated with the diaphragm as the latter is clamped in operative position.

By my invention a machine is produced which provides a plurality of pads arranged remove the worn and applying afresh cover thereto and again to start the machine.

' Furthermore, my invention provides a holding device that so far as I am aware is the first instance in the art of the use of a spreading or expansible head to clamp a disk in lace.

e my invention is perhaps most applicable to the type of machine herein shown, it is, however, applicable to any machine having a pad or'operative support for the abradant covering, in whichmy invention might be found useful. While in the foregoing description I have described a particular embodiment of my invention, my invention obviously is not lim-,

ited to. suchembodiment which was selected for descri tion and illustration only, nor to the speciii employed, the-latter being used in a broad or generalsense and not in their, s ecific nature, and I wish it to be understoo that my invention is not limited to the exact construction herein shown and described but that minor changes may be made without departing from the spirit and scope of'my invention.

Having thus described one embodiment of my invention, Iclaim and desire to secure by Letters Patent 1. In a machine of the type described, a hragm having an a rasive surface at one side, and a laterally expansible and collapsible clamping device carried within said spindle and operable 'within the annulus of said diaphragm, and operating means for collapsing the same to receive said diaphragm and for expanding it to clampthe same to said spindle. V v 2. In a machine of the ty e described, a

' spindle having a longitudi'na recess with an inwardly tapered opening communicating therewith at one end of said spindle, a hold-' ing device movable within said s indle hav-' ing a plurality of laterally movab emembers each provided with clamping faces to fit the tapered opening at the end of said .s ndle, an annular diaphragm having an 8, rasive surface and a central opening to re.- ce ve the clampmg faces of said members,

and means for operating said members for l clam ing or removing said diaphragmz; 3. In a machine of thetype described ,a

c arrangement of parts and terms "and depressi bufling device comprising a spindle having a central lip receiving recess atone end, the

Wall of which constitutes a clamping member; means slidably mounted within said spindle having a spreadable clamping head to cooperate with said recess wall, an annular diaphragm having an abrasive face and receiving the clamping head within its central opening, and means for operating said means to spread said head to form an inturned li at the inner edge of said diaphragm and clamp the same against said clamping mem-.

central opening, and means for operating said means to spread said head to form an inturned lip at the inner edge bf said diaphragm and clamp the same against said clamping member.

5. In a machine of thetype described, a spindle having laterally se arable clamping members at one end thereo an annular diaphragm having its inner ed e portions inturned by and forming a lip c amped by said spindle members, and means for moving said members from or toward one another respectively to form said lip and clamp the same or to release said lip andthereby said diaphragm.

6. In a machine of the type described, a spindle having an axial recess, a rod slidably. mounted therein and rovided with clam ing members at its ower end, aban e adapted to be operatively connected with said rod, and means for normally maintaining it out of contact therewith.

7. In a machine of the type described, a'

s indle having an' axial recess extending t erethrou h, a rod slidably mounted therein havin 0 am ing means at its lower end, a ivoted ever avmg a lo itudinal slot, a hlock'movably connected t erewith having an aperture throu h which said rod extends, means on said rod oth above and below said block'to be engaged by the-latter in elevating move said ro ,and means normallyto old said lever elevated with said block out of sai rod means. r

8. In a machine of the type described, a hollow rotary s indle having a dish shaped recess at its en communicating with the insaid lever correspondingl toterior of said spindle, a holding device 'sli d-.

ably mounted in said spindle having a spreadable head adapted to engage the walls of said pad spindle havin'ga conical recess at one 4 1 said diaphragm and permit its removal.

- spindle having a flanged disk at oneend dle,\an annular pad mounted on said seat, an

spindle having laterally spreading clamping jaws at its lower end, an annular diaphragm folampmg members to clamp t e inner edge with the annulus of said diaphracglm recess, an annular diaphragm adapted to be centered on said head and clamped thereby against the wall-of said recess by spreading said head, and means for operating said holdg device to spread its head to clamp saiddiaphragm. 1

9."In a machine of the type described, a

and, an annular diaphragm provided with an abrasive surface, laterally separable clamping members slidably mounted in said spin dle and operating through the annulus of said diaphragm, and means for se arating said portions of said diaphragm against the wa s of said recess or for moving said clamping members toward one another to unclamp.

10. a machine of the type described, .a spindle, an annular diaphragm having an a asive surface and adapted to be secured thereto, a holding device therefor having a collapsible and expansible head operating a apted when collapsed to permit the 'aphragm to be centered thereon and when expanded to bend the inner edge portions of said diaphragm inwardly and clamp the same against said spindle, and means for collapsing and expanding. saidhead for the purpose described. Y

11. In a machine of the type described, a spindle having a recessed seat at one end,- an annular diaphragm having an abrasive surface, a holding device slidably mounted in said spindle having a split button-shaped head the parts of which are relatively and. laterally movable Within the annulus of said diaphragm for expanding or collapsing said; head, and means forcollapsing or expand-Z ing said head respectively to permit applying said diaphragm thereto or to clam inner circumferential portions of said phragm' against the seat of said spindle. I

' 12; In a machine of'the type described, a

dia- 3 forming a pad seat concentric with said spinannular diaphragm having an abrasive. surface at one side thereof, .means mounted in said spindle comprising a laterally spreadable' head operating Within the annulus of said diaphragm, adapted to be projected below said spindle and collapsed to receive said diaphragmand to be elevated and spread to clamp the inner circumferential edge portions of said pad'against the annulus of said pad, and operating meanstherefor to collapse or spread said head for removal from or .a plication of a diaphragm thereto and for c amping the same to said pad. v

13 In a'mac'hine ofthe type described, a

tubular spindle having an inwardgy opening at its lower end, a to the i having an abrasive surface and a, circular e5 opening-to receive said jaws, and means forspreading said jaws for clamping said diaphragm to said spindle. q

14. A machine of the type described comprising in combination a spindle having a central opening extending therethrough and if carrying an annular pad at one end, s clamping device mounted to slide vertically in said recess and the .opening in said ad and .pro-

'vided withan expansible hea an annular diaphragm having an abrasive surface and receiving said head within its annulus, and means for sliding said clamping device and expanding its head to clamp sai diaphragm. In a machine ofthe typedescribe a ta ered sli' ably mounted in said spindle, and a plurality of vertical leverspivoted at the lower end of said rod and having their upper arms tapered to engage the wall of said recess.

16. In a machine ofthetype described, a

rotary apgndle having an axial recess, a flanged k at one'end of said spindle forming a seat for a pad and having an end recess communicating with that of the spindle, a holding device slidable in said recesses having a spreadable head, an annular pad seated and centered on said flanged disk, an annular diaphragm having an. abrasive surface adapted to be placed on said spreadable head and clamped thereby against the wall of the end recess, and means for operating said holding device to spread its head to clamp, the inner edge ,portions of said diaphragm against the wall of said end recess.

17. In a machine of thetype described, a

holding device for an abrading disk, o0m' prising a rotary spindle provided with 'later ally se arable clamping means for holding the dis in operative position thereon.

'18. In a machine 'of,the type described, a holding device for an abrading=disk,1com' prising a rotary spindle provided with laterally separable clamping means for-holding the disk in; operative position thereon, said means including a plurality of levers, 28 provided -with clamping jaws, 35.

19. In a machine of the.type described, 'a spindle having a tapered recess, 32, adjacent one end, a longitudinally movablemember provided with clamping jaws, 35, and clamp ing levers, 28, slidably mounted in said spindle to cooperate with said recess for separating said jaws.

20. In a machine of the type described, a

holding device provided with a clamping and means for operatin' said jaws. v

21.; In a machine 0 'the character de- I scribed, the combination of a pad. carryingspindle, means .to rotate-said spindle ,a member movable longitudinally with respect to 7 means having segmental clamping jaws -35 said spindle and provided with clamping name to this specification, in the presence of means for a diaphragm, means for moving two subscribing witnesses.

said member longitudinally of the spindle, n H ,H

and means for stopping rotation of said GEORGE 5 member when in position for a change of dia- Witnesses:

phragms. MERTON D. PHELAN,

- In testimony whereof, I have signed my .SIDNEY F. SMITH.

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