Патент USA US2116153код для вставки
May 3, 1938. w. I_„KEEFER 2,116,153 ABRADING AFPARATUS. Fi_1ed sept. 2,' 1937 /É /7 /4 . y ' s sheets-sheet 1 . l 55,43 SLÄ/WM _ SIMM/1f Ma'y 3, 1938. w. L. KEEFER ' 2,116,153 ABRADING APPARATUS Filed Sept. 2, 1937 ,47 46’ 45 45 41# 5 Sheets-Sheet 2 May 3, 1938. ' > l w. l... KEA-:FER ABRADING APPARATUS Filed sept. e, 1957 A â A 2,115,153 ^ s shéets-sheet s Patentedl May 3, 1938 2,116,153 `I UNITED STATES PATENT _()FFICE 2,116,153 " ABRADING APPARATUS ` Walter L. Keeler, Hagerstown, Md., assigner to Pangborn lCorporation, Hagerstown, Md., a corporation of Maryland Application September 2, 1937, Serial No. 162,214 26 Claims. (Ci. 51.-9) 'I‘he present invention relatesto abrading ap-- ‘ceeds in connection with the annexed drawings paratus, and more particularly to apparatus and from the appended claims. In the drawings: , , ‘known in the trade as blast cleaning machines Figure 1 is a longitudinal sectional view of lan embodying means for projecting a stream of abrasive in thel form of sand or steel abrasive> ‘apparatus embodying the invention. G ‘ ,Figure 2-is a view looking from the right hand against castings or other articles of Work to `- cleaned of surface accumulations. ' side of the machine shown in Figure l and parts Although centrifugal abrading machines have have been 'broken away in order to more clearly been known for years in the abrading art, both’ o with directional control and without directional control, the problem of wear of the blades and other parts has been a serious consideration, re gardlessv'of whether they are of the “slider” type, wherein the abrasive is admitted at low velocity4 15 over the inner ends. of the blades and is continu- » 20 show the structure involved. ’ Figure 3 is a sectional view taken on the line 10 3_3 o_f Figure 2 showing the parts as .they appear when viewed in the direction of the arrows. Figure 4 isa fragmental sectional view of a part of wheel shown in Figure 1 and illustrates one of the abrasive discharge openings. ’ 15 ously accelerated to the blade tips or whether they are wheels. embodying batter blades where Figure l5 is an elevational view of the feed chamber of the machine of Figure 1, and illus the entire abrading velocity is imparted to the trates the abrasive dellector. abrasive by a single instantaneous impact there Figure 6 is a. longitudinal sectional view simi lar to Figure l but illustrates a modiiled form of the invention. Figure 7 is an elevational view looking from with. Y ‘ ‘ - Although the slidervtype machines in commer cial use today represent a great advance in the art over the machines heretofore in use they do not possess all oi' the operating characteristics desired and fall considerably short of the “ideal” 25 machine which would pick the abrasive up with out shock and gradually Vmove it out to the periphery of the rotor without sliding it and then discharge it without wearing influence upon any , part of the machine. . - the right hand‘side o_f Figure 6 and parts have been broken away in order to more clearly show the structure involved. _, „ Figure 8 is a fragmental sectional view of the s machine shown in Figures 6 and 'l and illus trates the rotatable disc employed to deflect lor dislodge the abrasive from the inner surface of the wheel. , ' It is accordingly a primary object of this in Figure 9 is a longitudinal sectional view vention to provide an abrasiveA throwing wheel Vthrough a further modified form oi' wheell also which does not employ any blades whatsoever forming part of the invention. and more nearly approaches the “ideal” abrading Figure 10 is a partial elevational view of the apparatus than anything heretofore proposed. . machine shown in Figure 9 and illustrates it as It is another object to devise a centrifugal it appears when viewed from the right hand side of that ligure. ._ , abrading machine wherein the abrasive is ad Figure 11 is a fragmental partial sectional view mitted near the axis of rotation, moves outwardly with substantially no propelling influence and »of ‘machine shown in Figures 9_ and 10 and shows then is released from the wheel substantially at the deñecting members. the peripheral speed thereof without having» a Figure 12 is a face view of a bladed rotor-em batting or other impacting action applied thereto. bodying the abrasive propelling mechanism of It is a further important object to design a the invention. ' ' wheelfor mechanically vthrowing abrasive which Figure 13 is 'a longitudinal sectional view employs no blades whatsoever, retains a prede through the wheel shown in Figure ,12, and in .ermlned quantityof abrasive in the wheel at all this form the defiecting disc has been- only dia times and discharges a predetermined `quantity grammatically illustrated. p at each rotation of-'the wheel and imparts a high Figure 14 is an enlarged sectional view of the abrading velocity to‘the abrasive. ' My invention also aims to provide an abrasive and feeding and propelling assembly that may be used in combination with centrifugal bladed ro tors for imparting directional control thereto. Further objects of the invention will become ._ apparent as the accompanying speciñcation pro 35 ' ‘ 4-0 45 feeding mechanism employed inthe machine of Figures 12 and 13 andl illustrates the manner in 50 _which the abrasive is introduced into the abrasive chamber and discharged therefrom. - ` With continued reference to the .drawinga‘ whereinlike reference characters have been em ployed throughout the several views thereof to 2 2,116,153 designate like parts, and with- particular refer ence to Figures 1 to 5, inclusive, the machine upon whose inner surface the abrasive is cen a pair of bosses 34 on member 22 by means of a pair of screws 35. Deñector 33 is curved as seen in Figure 2, and trifugally built up and the layer of abrasive- is its outer edge lies in close proximity to the in broadly comprises a hollow rotatable member ' instance I have shown it as being supported by automatically discharged from the member at a ner surface of the rotor, with the result that predetermined point in rotation by means of when the wheel is rotated the layer of abrasive a defiector which directly engages the layer of .. lying on surface 3| will be continuously acted upon by the defiector and deflected into open abrasive deposited within said member. f . 10 The hollow member just referred to includes a ings I5. Referring to Figure 3, Áwith the Wheel rotating head I0, which is mounted on a shaft II. The latter is journaled for rotation in any suitable in the direction indicated by the arrow, an abra sive particle is indicated at 38 as just contacting As seen in Figure 1, head I 0 is hol manner. lowed out from one side and is provided with an blade 33. This particle, prior to engagement abrasive accelerating groove I2 at its periphery thereof with the defiector possessed a velocity 15 which merges with a radial face I3 of the rotor. Vr or a velocity equal to the peripheral speed of Head IIJ is also provided with a flanged portion the rotor. Upon engagement of the particle with defiector Il in which a plurality of abrasive discharge openings I5 are provided. 33, it assumes a velocity having an axial com In order to provide for wear >oi’ the parts and make it possible to replace certain parts of the machine Without replacing the entire rotor, a wear bushing I1 is disposed in each opening I5 ponent Vd and the two combined give a resultant 20 velocity Vx. Therefore, there is continuously deposited on the inner surface 3| a layer of abrasive and this layer of abrasive is being con tinuously discharged from the wheel at one point and as seen in Figures 1 and 4, each wear bush ing I1 is provided with a portion extending into opening I5 and is provided with an inclined rear wall I8 for a purpose that will presently appear. A disc 2| is preferably secured to the end of the rotor for preventing inadvertent escape of abrasive,.but it may be omitted if desired. 'I'he abrasive may be admitted to the interior of the rotor in any suitable manner, but I pref erably employ a generally cone shaped member 22 having a funnel portion 23 and which is mounted on a shaft 24. Shaft 24 is journaled in a bearing 25 provided on a bracket 26 and the latter is secured to a stationary base 21. Feed chamber 22 is accordingly mounted for rocking movement about the axis of rotation of 40 the rotor and it is provided with a handle 28 for manipulating it into its adjusted position. A set screw 29 is threaded into bracket 26 for lock ing shaft 24 in its proper adjusted position. Assuming that shaft II is driven by any suit able prime mover at a speed of approximately 2500 revolutions per minute, and abrasive is ad mitted to spout 23, it will travel at relatively low velocity until it strikes the mass of abrasive in the abrasive acceleration groove I2, where it will 50 be picked up and rapidly attain the peripheral speed of the rotor. In view of the fact that when the Wheel is in operation groove I2 is filled with abrasive, theaccelerating action imparted to the abrasive is taken by the abrasive itself that is accumulated in the groove, and accordingly Wear of the acceleration groove walls is minimized. Assuming that the wheel is rotating as just de-I scribed, the abrasive will fill up groove I2 and then spill over onto the internal surface 3| of the rotor. The parts are so designed, and rotor surface 3| is of suilicient Width so that as the abrasive builds up it will assume the form of a cone with its inner surface inclined at an angle equal to the angle of repose of the particular 65 abrasive, and during normal operation will not spill into openings I5 unless it is acted upon by the defiector, which will now be described. by reason of defiector 33 engaging it and caus the discharge openings. Y In view of the fact that the abrasive lying centrifugally on surface 3| is rotating at~ the peripheral speed of the wheel, and as this speed 30 is selected to correspond to the desired abrasive discharge speed, it is unnecessary to impart a blade action upon the abrasive as it is spilled through opening I5 in order to impart an abrad ing velocity thereto. Wall I8 of opening I5 is 35 accordingly inclined as shown in Figure 4 in order to avoid an impelling influence being given to the abrasive as it passes through opening I5. However, if desired, the combination of the rim discharge and blade action may be used, and in a succeeding form of the invention I have shown a machine of just this character. In view of the fact that the point of discharge of the abrasive is dependent upon the angular position of defiector 33, the wheel may be caused 45 to fire in any direction by loosening screw 29 and rocking the feed chamber 22 in the proper direc tion> to cause the machine to discharge in the desired direction. As a matter of fact, if it is desired to have the machine discharge upwardly 50 the feed chamber may be located in the position shown in the drawings, but the defiector may be secured thereto at a point 180 degrees removed from the location shown in order to make the Wheel fire upwardly rather than downwardly. If 55 after the Wheel is in use it is found that the spray angle or the width of the centrifugal blast is too narrow, the defiector may be moved closer to the Wheel so as to deflect'a greater depth of abrasive for each revolution, or the defiector may 60 be longer so as to deflect a greater body of abrasive or a flange may be provided on the de fiector to dislodge a greater quantity of abra sive. To this end member 33 may be adjustably mounted on chamber 22 or any other stationary 65 part of the machine. If desired, however, two deñectors may be One form of defiector means that may be used placed in series at different angular points so as to dislodge abrasive at a predetermined point in < to increase the width of the abrasive spray angle. .Although I have shown a particular feed cham 70 the revolution of the rotor, is shown in Figures 3 and 5, and it consists of acomparatively thin' blade 33 made from -any suitable heat resistant material, such as tungsten alloy steel. y Deflector blade 33 may be stationarily sup 75 ported in any desired manner but in the present 25 ing it to be pushed axially into registry with ber for introducing the abrasive in the rotor, it is to be understood that if desired various other forms of abrasive admitting means may be used. For instance, abrasive may be admitted at the center of a pair of grooved rotating discs and be 75 3 2,116,153 allowed to trickle ~outwardly thereover and grad~ ltace 45 and/or edge 59 may be formed in a ually4 accelerated. separate removable and replaceable wear element'. , It will be understood that a disc deiiector like ' ' Taking up the formrof invention illustrated in Figures 6, 7 and 8, the major differences between this device and the first described form oi’ the invention reside in the use of a wheel having pas sages for gradually accelerating abrasive as it moves outwardly and also, a rotatable 4disc which is employed to deflect the abrasive at a predeter 10 mined point in rotation. In this form of the invention a rotor 4D is mounted on shaft 4I and is provided with a pair of abrasive accelerating that used in the form or the-invention illustrated . l in Figures 6, 7 and 8 may be used instead oi' the '.deñector 33 in the form of the invention illus trated in Figures 1, 2 and 3. = Referring now tu Figures 9 and'lo or the dra'w- ' ings, I have shown a wheel somewhat similar to the wheels previously described and embodying 10 a rotor 60 mounted on a shaft 6l and having a rim portion 82 to which is secured an end plate 83. . flanges“ and 43, an abrasive acceleration groove ' In rim portion 62 there are provided a plurality 44 and an abrasive supporting or deposit sur of inserts 64 aiîording a plurality of discharge face 45. - openings 65. , . 15 v In this form oi.' the invention no acceleration 46 is similar to that previously described with the exception that it provides a pair of annular grooves 41 and 48 which cooperate with flanges groove is employed as the abrasive is dumped into 20 42 and 43 of rotor 40 to deñne a tortuous passage. Thereforel when the abrasive introduced in cham ber 46 ñrstencounter's -ilange 42 it is partially accelerated, fills up to the angle of repose and 'spills off the edge into groove 41 where it is 25 deilected onto flange 43. Flange 43 being fur ther. from the axis of rotation is rotating at a greater peripheral speed than ñange 42, the abrasive accordingly receives further >acceleratitm when'it strikes this viiange. 'I'he abrasive then 30 spills oi’f flange 43 into the acceleration groove, which, being located still further from the axis of- rotation further accelerates the abrasive.~ The feed chamber is mounted on a shaft i5 as before, which is journaled in a bracket 5l carried 35 by a base 52. ' An operating handle 53 is employed to rock the feed chamber into vthe proper an gular position and the set screw 54 is employed l - In this form of the invention feed chamber to lock it in place. . ` a recess 66 provided in the rotor disc and builds up kon surface 61vwhere it isI deflected _into dis charge opening 65 by either a stationary de?ector member or a rotatable disc as described in con nection with the first form ofthe invention. In this form of the invention a cage is em ployed embodying a cone portion 63 which is se cured to a hub portion 1l by a plurality of cap 25 screws 12. < Portion 1| is provided with a funnel portion ‘I3 and it is secured to a hollow shaft 14 by means of a key 15 and a'set screw 1B. Shaft 14 is journaled in a support 18 and is provided with an operating handle 19. Shaft 14 is ad justably locked in ñxed position by nut and bolt assembly 8i which cooperates with an arcuate slot 82 in support 18', whereby the parts may be locked by tightening the nut and bolt iassembly. Journaled in sleeve 14 is a shaft 53 to which 35 is secured a handle t4 by means of a set screw 85. Handle i carries _a detent 86 which cooperates with serrations il formed on`a downward ex In this form of the invention a disc 55 co operates with the rotor to spill the abrasive over the side edge of the rotor and it is journaled in a bearing 51 carried by an arm 58 which, as shown, is an integral part of the feed chamber, with the tension 58 of handle l5. This device is similar to that described in connection with the drst form 40 of the invention, the abrasive being admitted in chamber 5d and piling up against the inner sur face lil of the rotor and being dislodged orde result that the direction of discharge may be _~ fiected through opening 55 by means oi’ a sta Ai- ._ tionarily supported deflector either oi the sta though wheel 55 may if desired be driven by a tionary plough or shoe type shown in Figure 5 or 45 controlled by rocking the feed chamber. -separate prime mover, it has been found that the - the rotatable disc type shown in» Figure 8. l friction _of the abrasive upon the wheel is s have however, illustrated it as comprising a shoe cient to Acause it to undergo independent rotation. 5d which is adjustably mountedon chamber 58 50 Disc 56 may also, ii’ desired, be adjustably sup- ' by a pair of stud and nut assemblies 85. Shoe im 50 ported so as to dispose its axis at any suitable is inclined in a manner similar to shoe 33 oi inclination tothe axis of the wheel. l Figure 5 and it may be adjusted, either to vary the fBy reason of the fact that the peripheral speed vdischarge oi the machine or to compensate for' of disc 55 is substantially equal to the peripheral t wear by loosening the stud and nut assemblies. In this ioi‘rn of theinvention there is employed 55 55 speed oi' rotor lill, it is apparent that it will un dergo a minimum abrading action during opera a primary deñector blade i5 which acts upon the tion, and at the same time smoothly spills the abrasive before blade iid comes into play and as abrasive over the side or discharge edge 55 of the the initial contact 'is oi greatest magnitude the rotor. 460 ' ' Although l have illustrated disc 5t as lying at a predetermined angle with respect to the axis of rotation of rotor du, it is to be understood that vthis angle may be increased or the disc axis in clined so as to dispose the disc in other direc 65 tions for discharging the. abrasive from the wheel, depending upon the particular work being han dled, the> abrasive used, and other inñuential factors. It is accordingly seen that with this forni oi l 70 the `invention vthe abrasive ~continuously spills over the edge 59 of rotor 40 in a smooth unbroken stream of narrow width, whereas in the ilrst form 'of invention described, the abrasive discharge is primary blade takes the most wear. Accordingly in order to `make blade 5d quickly and easily' ad-- 60 justable to compensate for wear it is mounted for guided sliding movement in a recess in chamber 55 and projects outside chamber 55 adjacent the leading edge of blade lili. _e ` Pivotally secured to blade-55 by means of a pin 65 5l is'a connecting link di, which in turn is con nected by means oia crank pin 53 to a disc 5d . rigidly carried by shaft di. f It -is accordingly apparent that when the ma chine is placed in operation blade 95 will initially 70 contact and- apply a primary deiiecting action upon the layer of abrasive accumulated on sur face 5l and blade it will apply a secondary de-' discontinuous in the sense that it is successively ñecting action thereupon. When the outer end discharged through openings l5. If desired sur- ` of bladev 55 has A.become worn through contact 75 .2,116,153 4 of the abrasive therewith lever 84 may be rocked so as to cause link 92 to project blade 98 out ' wardly into a new position. The parts have been illustrated as “new” and hence in Figure l0 le‘ver ch ' 84 may be moved step by step through 180° be fore blade 90 is unfit for further service. Also, from time to time blade 88 may be adjusted out wardly to,c0mpensate for4 wear in the manner previously described. claims are therefore intended to be embraced therein. . What is claim-:d and desired to be secured by United States'Letters Patent is: 4l. In an abrading apparatus, a structure mounted for rotation at‘high speed, said struc ture providing a. generally annular surface fac ing toward 'the'axis of „rotation of said struc ture, means for depositing abrasive upon said ` In Figures 12, 13 and 14, I have shown a com-f surface, and discharge means for dislodging the 10 10 bination ofa rim discharge abrasive throwing deposited abrasive from said surface at a prede termined point in the rotation of said structure wheel used as the feeder for a bladed abrasive " for projecting said abrasive at an abrading ve throwing wheel. locity. With continued reference to these figures, a V 2. The abrading apparatus set forth in claim l, 15 15 rotor H0 mounted on a shaft IH is provided with a plurality of abrasive propelling blades l I2. The blades terminate short of the axis of revolu tion to define a central spaceand mounted in this space is a chamber H3 and it is preferably 20 removable so that it may be taken out and re placed when _it has become tooy worn for fur ther service. A . The abrasive >is fed to the interior of mem 425 ber H3 by meansof a feed conduit H5. Jour naled in conduit l I5 or in any other suitable man ner is a shaft H6, carrying a- spider H1 which in turn supports a disc H8. In this lforml -of the _invention abrasive is introduced through chute H5 and piles up to its angle of repose on the point in the rotation of the parts disc H9 de fiects a layer of abrasive 'over the edge |2| of member H3 onto the inner ends or heels of the throwing blades. In view of the fact that the l35 direction of discharge of the abrasive from mem ber H3 is substantially tangential the abrasive 30 interior of member H3, and at a predetermined is picked up by the inner ends of the blades with negligible impact. - The direction of discharge from this wheel may be controlled in a manner similar to that , effected in the wheels previously described,- name 1y,` byadjusting angularly the point at which` the deñector cooperates with the abrasive lying on the inner surface of member H3. Accord ingly it is only necessary to adjust. spout, H5 and shaft H6 to locate disc H9 in the proper ` position to effect the desired discharge of abra- r sive. ~ wherein said discharge means comprises a sta tionarily supported device for directly engaging the deposited abrasive and imparting an axial movement thereto. 3. The abrading apparatus set forth in claim 1, 20 wherein said discharge means comprises a sta tionarily supported device mounted adjacent said structure _and cooperating with said deposited abrasive, said device being lmovable into a plu rality of angular positions with respect to the 25 axis of» saidl structure, whereby the direction of the discharge of abrasive from said structure may be varied at will. - 4. In an abrading apparatus, a structure -mounted for rotation at high speed, said struc 30 ture providing a generally cylindrical surface fac ing the axis of rotation of said structure, means for depositing abrasive upon said surface while said structure is rotating, and discharge means for moving said deposited abrasive axially so 35 as to discharge it from one edge of said surface when said abrasive attains a predetermined posi tion in the rotation‘ of said structure. 5. The abrading apparatus set forth in claim 4, ' ‘ wherein said discharge means comprises an in 40 clined deflector blade stationarily supported ad jacent said structure and operable to engage and deflect said deposited abrasive axially over said one edge of said surface. . 6. The abrading apparatus set forth in claim 4, 45 wherein said discharge means comprises a rotat able member disposed adjacent said structure and operable to directly engage said _deposited . Although I have shown member H8 as being abrasive. , 1 Y A'7. In an . abrading apparatus, a structure 50 50 driven @synchronously with the rotor and feed- ß mounted for rotation at ¿high speed and com ing the abrasive over the inner ends of the blades, it may be independently driven and feed the abra sive over the side edges of the blades without departing from the spirit of my invention. Also, 55 I have illustrated certain parts of the appara tus as’being integrally formed with the rotor. but it is tobe understood that if desired sepa rate replaceable wear elements may be provided._ prising a hollow member, means for depositing abrasive upon the inner surface of said member while the latter is rotating and abrasive discharge means for engaging and deiiecting said abrasive 55 over one end of said member while the same is rotating for discharging said abrasive at an abrading velocity. - ~ 8. The abrading apparatus set forth in claim '7, In all of the forms of the invention ,the abra- ' wherein said first named means is operable to 60 sive is deposited _on lthe inner surface of the deposit abrasive upon said member at a point suf rotor and lbuilds up to its angle of repose and ficiently remote from said one end of said mem therefore the deñector need apply but> force ber so that said abrasive will build up to its angle of repose adjacent to but short of said enough to cause the abrasive to move to the dis one end `of said member, whereby said abrasive charge point. Therefore, the wear on the de 65 flector is minimized. will be discharged from said member only when ' ' it is engaged bysaid abrasive discharge means. The invention may be embodied in other spe 9. An abrading apparatus comprising a struc ture mounted for. rotation at high speed, said embodiment is therefore to be considered in-all r structure embodying a hollow lmember rotatable 70 70 respects as illustrative and not restrictive, the with said structure with its axes coincident to scope of the invention being indicated by theV theA axis of rotation of said structure, said mem appended claims rather than by the foregoing ber having a plurality of discharge openings pro» description, and all changes which come within vided therein disposed in the same general plane the meaning and range of equivalency of the of revolution, means for depositing abrasive upon ciñe forms without departing from the spirit or essential ,characteristics thereof. The present _ 5 9,116,153 the inner surface -of said member in- a region _ charge means comprising a primary deflecting spaced vfrom _said discharge openings. and means located within said member for engaging the lay element and a secondary denecting element for en'gßßlng the deposited abrasive, said primary de er of abrasive deposited within said member and iiecting element having means for adjusting it moving it axially to said discharge'openings. _ 10. In Van „abrading apparatus, ' a structure toward and away from said generally cylindrical mounted for rotation at high speed, saidstruc ture providing _an annular inwardly facing abra sive supporting surface terminating at one end in mounted forV rotation and providing a generally ` 17. In an abrading apparatus, a head structure annular surface facing toward lthe axis of rota 10 an abrasive discharge edge. means for depositing tion of said head structure, means for depositing 10 abrasive upon said surface while said structure is abrasive upon said surface. and control means forv Y rotating and allowing said abrasive to attain the- causing the deposited abrasive to discharge _from'b r . full peripheral speed of said inner surface, said abrasive being deposited upon said inner surface at a point spaced from said discharge edge and adapted to build up thereon to its angle 'of repose said surface at a predetermined point‘in there-‘ff '_ tation of said head at an abrading velocity.; 18. The apparatus set'forth in in said control means comprises a without spilling over said discharge edge, and a - rotatable disc mounted adjacent said structure for‘deilecting said deposited abrasive over said 20 discharge edge and discharging it at an abrad .ing velocity. ' A11. The abrading apparatus set forth in claim 10, wherein saidV structure is- provided with an abrasive acceleration groove adjacent said an 25 nular surface which is adapted to accumulate a _body of abrasive when said structure is rotating. 12. 'I'he abrading apparatus set forth in claimv l0, wherein said structure is provided with means for accelerating the abrasive in stages before it 30 is depositetl upon said annular surface, whereby said abrasive promptly attains the full peripheral speed of said structure upon contact therewith. 13. In an abrading apparatus, a structure mounted for rotation at high speed and having 35 a plurality of abrasive propelling blades provided thereon, and means mounted adjacent the center of rotation of said structure for feeding a stream of abrasive over the edges of said blades for causing the abrasive to be picked _up and-dis 'dil charged by said blades in a predetermined direc ` 17, wherej-' ¿ tating about- an axis inclined to theßaxis‘offsaid head structure and ico-operatingïwithïthe sive deposited _on said annular surface.'u v ' _ 19.v In an abrading apparatus. 'a-fhead structure - mounted for rotation and having’an [annular abrasive accelerating groove facing toward. the axis of rotation of said head, means for deposit- - __ingabrasive 'in said groove, said head structure also providing a generally annular, inwardly fac >ing surface adjacent said groove and adapted to ‘ receive abrasive overflowing from said groove and control means for causing the discharge of abra-4 ‘ sive from said annular surface at a predeter mined point in the rotation of said head struc ture. ~ . 30 _ 2i). In anabrading apparatus, Aa rotor mounted for rotation at high speed and having a plu rality of abrasive propelling Ablades provided » thereon; a generally cylindrical rotating feed 35 chamber mounted adjacent, the axis of rotation « of said rotor; means for-feeding abrasive to said feed chamber for causing vit to centrifugally build up to its angle of repose on the inner surface of said feed chamber; and means for denecting the accumulated abrasive from said feed chamber into‘the path of said abrasive propelling blades at a predetermined point in the rotation of said ro tion, said means comprising 4a rotatable element providing an inwardly facing surface; means for feeding abrasive to said surface; and means for dedecting the abrasive accumulated on said sur’ ' tor', for causing the abrasive to be picked up and face into the path of rotation of said abrasive pro discharged by said blades in a predetermined di 45 pelling blades. . . ` rection. , I _ 1d. lin an abrading‘apparatus, arotor having a plurality of abrasive propelling blades terminat for rotation at high speed and having a plurality ing short of the axis of rotation to define a cen of abrasive propelling vblades provided thereon, tral abrasive admitting space, abrasive feeding dl. lin an abradlng apparatus, a rotor mounted said blades terminating short of the anis of ro _means mounted in said space and rotating syn chronously with said rotor providing an inwardly tation of said rotor to denne a central space; a abrasive upon saidsurface, and abrasive deflect ing means for deñecting the abrasive deposited of said blades, means for feeding abrasive to said . on said surface over said discharge edge into' the lates on the inner wall thereof, and `means for' 50 generally cylindrical feed chamber secured 'to facing abrasive supporting surface, said surface » said rotor, and projecting into said central space, having a discharge edge disposed between the in said feed chamber terminating at one end in a' bb ner ends of said blades, means for depositing discharge edge located adjacent the _inner ends 55 dll path of rotation-of the inner ends of said blades. /dehecting the accumulated abrasive from said l5. The abrading apparatus set forth in claim feed chamber over the discharge edge thereof 14, wherein said abrasive deñecting means com and over the inner ends of said blades at a pre prises a disc .disposed within said abrasive feed determined polnt in the rotation of said rotor, ing means and mounted for rotation about an` for causing `the abrasive to~ be picked up and'dis axis which is inclined with respectto the axis of charged from said blades in a predetermined 65 rotation of said rotor. i6. In an abrading apparatus, a structure ym feed chamber, whereby it centrifugally accumu mounted for rotation at high speed, said struc ture providing a generally cylindrical surface facing the axisA of rotation of said structure, means for depositing abrasive upon said surface while said structure is rotating. and discharge direction. I , ' , 22. The abrading apparatus deñned in claim 2l, wherein said rotor comprises mat least one disc >like structure and said blades are disposed with their side edges contiguoim to, one face thereof,. and said feed chamber is secured to said struc ture with its discharge edge located between said 'means for moving said deposited abrasive axially _ structure and a plane normal to the axis of rota so as to discharge it from one edge of said surface tion of said rotor and disposed midway between when said abrasive attains a predetermined po the side comes of said abrasive propelling blades. 75 sition in the rotation of _said structure, said dis 23. The abrading apparatus dedned in claim 2l., 70 6 2,11%,153 wherein the diameter of said feed chamber is ap proximately equal to the length of said blades. to the path of _rotation of said abrasive propelling blades at a predetermined point in the rotation _of said rotor for causing the abrasive to be picked 24. In an abrading apparatus, a structure _ up and discharged by said blades in a predeter mounted for rotation at high speed and having mined direction, said disc having a central open a plurality of abrasive propelling blades pro ing, said feeding means being operable to dis vided thereon, a rotatable feed chamber mounted charge abrasive into said rotatable element adjacent the axis of rotation of said structure through the central opening- of said disc. ' and having an inwardly facing surface, means 26. In anv abrading apparatus, a rotor having for feeding abrasive to said feed chamber, and a plurality of abrasive propelling blades provid defiecting meansfor deñecting the abrasive ac ed thereon, said blades terminating short of the 10 cumulated on said surface into the path of rota axis of rotation of said rotor to define a central tion of said blades at a predetermined point in space; said rotor having in said central space an the rotation Aof said structure, said deflecting inwardly facing abrasive accumulating annular means being adapted for selective rocking move ledge rotatable synchronously with said rotor and 15 ment about the axis of rotation of said structure 15 having a discharge edge located adjacent the into a plurality of different angular positions, path of rotation of the inner ends of said blades, whereby the point in the rotation of said struc-‘ and between the planes of rotation defined by ture at which the abrasive is deñected into the the side edges of said blades; means for depositi path ofrctation of said blades’ may be selec ing abrasive upon said ledge, and means for de 20 20 tively varied. lfleeting the accumulated abrasive from said ledge 25. In an abrading apparatus. a rotor having over the discharge edge thereof and onto the in a`plurality of` abrasive propelling yblades pro ner ends of said blades at a predetermined point vided thereon; arotatable element mounted ad in the rotation of said rotor, for causing said jacent the axis of rotation of said rotor and pro abrasive to be discharged in a predetermined di 25 25 viding an inwardly facing abrasive accumulating surface; feeding means i'or supplying abrasive to said surface;~ and a rotatable disc for deilect ing the abrasive accumulated on said surface in rection from said rotor. ' ` WALTER L. man.