Патент USA US2131768код для вставки
Oct. 4, 1938. D_ TURNBULL 2,131,768' ' AÍ’PARATUS FOR TREATING METAL ARTICLES Filed Aug. 21, 19:56I 5 sheets-sheet 1 ìNVENTOR _Wulf/a’ í.' ihr/Mull BY Oct. 4,’1938. I _ I D. c. TURNBULL APPARATUS .V - 2,131,768 FOR TREATING METAL ARTICLES Filed Aug. 2l, 1936 y v 5 Sheets-Sheet 2 Z5, 1i 15 ATTORNEY Oct. 4, 1938. - D_ Q_ TURNBULL.- 2,131,768 i APPARATUS FOR TREATING METAL ARTICLES Filed Aug. 21, 193e 5 sheets-sheet 5 @ß 31 INVENTOR ' .ATTORÑEY _ Oct. 4, 1938. 2,131,768 n. c. TuRNBùLL' APPARATUS FOR TREATING METAL ARTICLEÈ Filed Aug. 21, 1936 5 Sheets-Sheet 4 INVENTOR i ßazf/fl @7i/mhd! ' BY ATTORNEY Oct. 4, 1938. D. c. TURNBULL 2,131,768 APPARATUS FOR TREATING METAL ARTICLES Filed Aug. 21, 1936 _ 5 Sheets-Sheet 5 'à *ß s QEw «à ` \ n “5 w à â@ ‘Q œ ‘ì - s Ñ w1 \ g; im ë s I l è ' I n I :,- 'I i __l “ \ Ln F, ` § ‘B °” " “3 N w` 1 â I' ‘à ‘ \ ` | ß | | __ -T | N l l l . 16! W l ' ' l A N ` ‘Lì . AT1-ORNE' - Patented Oct. -4, 1938 . “ 2,131,768 UNITED STATES PATENT OFFICE _2,131,768 APPARATUS Foa TREATING METAL ARTICLES David C. Turnbull, Mishawaka, Ind., assignor to ` American Foundry Equipment Company, Mish awaka, Ind., a corporation of Delaware Application August 21, 1936, Serial No. 97,099 9 Claims. This invention relates to apparatus for treat ing metal articles.. In cleaning, polishing, hardening, or otherwise treating the surfaces of metal articles by pro jecting a stream of treating particles there against, it is desirable to manipulate the articles so that the various surfaces of each article are porting surface. The article- supporting and tumbling bars may be provided with suitably shaped cam-like blocks fixed thereto or each bar may include a generally cylindrical shaft formed with suitably positioned grooves or flanges. The 5 articles may be deposited on the conveyor from above the conveyor and may be removed by a chute extending from the discharge end. How fully and eñiciently treated. It is also desirable that‘the processbe carried out continuously, in ' ever, if desired, a rotatable feed drum and a dis order to eliminate the necessity for shutting dowr. charge drum may be provided for supplying the the apparatus when supplying the articles to the articles to the conveyor and removing them there from or both. The drum is disposed adjacent the apparatus and removing them therefrom. According to the present invention, the articles end of the conveyor and is formed with spaced, to be treated are deposited on a conveyor having inclined abutments, comprising lugs, ñanges or 15 an arcuate, trough-like supporting surface. The the like, adapted to advance the articles along 15 the drum when the latter is rotated. ‘ conveyor comprises a series of individually mov The invention provides a method whereby able elements having lugs adapted to‘engage the ' articles and cause them to tumble or turn, the lugs articles to be treated may be positively, effectively also serving to advance the articles along on the and uniformly treated. The articles are tumbled about on the vconveyor and each article is car 20 conveyos and ¿through a stream of treating mate rial. The articles are fed continuously into the ried into the abrasive stream -and subjected to apparatus at one end, passed through the stream thorough uniform treatment. The tumbling ac while undergoing a forward tumbling action and tion also assists in shaking loose from the articles are thereafter discharged from the apparatus at the other end. One or more abrasive streams of fanlike divergent shape each extending in the direction of the general forward movement of the articles through the apparatus operate to uni ' formly and thoroughly clean all exposed surfaces . v of the articles as they are tumbled and progres sively advanced through the conveyor. Thus by reason of the cooperative relationship between the fan-like movement of the abrasive particles-and the uniform tumbling movement of the articles in the conveyor, highly effective cleaning and treating results are attained. The apparatus for carrying out the process ac cording to the invention includes one or more abrasive throwing wheels of the rotary centrif ugal type, each having means for controlling the direction of flight of the abrasive, operating in synchronism with a conveyor having an arcuate trough-like supporting- surface and adapted to rust, scale or other adherent foreign matter. The length of the treating period may be» positively controlled by proper adjustment of the speed of rotation of the conveyor bars. The apparatus is relatively simple, yet strong and rugged in construction, and the various parts which receive substantial wear can be quickly and 30 easily removed for repair or replacement. The apparatus is substantially automatic in operation and requires a minimum of attention. > I An object of the present invention is the prei: vision of an improved, economical and eilicient 35 apparatus for cleaning, polishing, hardening or otherwise treating 'the surfaces of the articles, whereby »the operation may be carried out con tinuously and substantially automatically.- carry articles through the stream and turn them about therein. The arcuate article suppoting sur face is constituted by a plurality of longitudinally Another object of the invention is the pro 40 vision of apparatus for treating metal articles which-is simple, rugged, eilicient and economical and which uniformly and effectively treats all of the surfaces of the articles._ Another object of the invention is the provision 4 5. of a combined rotary centrifugal throwing wheel extending, generally parallel and relatively closely or Wheels having means associated therewith for spaced bars. The bars are `mounted for indi controlling the `direction of flight of treating par-. vidual rotation and are provided with spaced lugs or abutments which serve to advance the articles upwardly along the side wall of the arcuate sur ticles to produce a fan-like stream and a convey face to a point from which they tumble toward the lower portion of the surface. The abutments stream. preferably have inclined wall portions adapted to advance the articles longitudinally along the sup ing mechanism for advancing articles alo'ng said r50 stream and for tumbling them about in said ' Still another object of my inventionis the provision of a novel mechanism for continuously and automatically supplying articles to be treated 55 2 2,131,768 to the conveying mechanism for treatment and for removing the articles from said conveying mechanism after treatment. Various other features and advantages of the invention will be apparent from the following particular description and from aninspection of the accompanying drawings. Although the novel features which are lieved‘to be characteristic of this invention 10 be particularly pointed out in the claims pended hereto, the invention itself, as to its 15 be~ will ap ob Each projector wheel generally comprises a plu rality of spaced and generally radially arranged throwing blades I6 which extend from adjacent the periphery of the wheel to inwardly short of the center to deñne a circular opening 22. Disposed in the circular opening 22 is an impeller 23 having a plurality of radially arranged vanes by referring to the following description taken in connection with the accompanying drawings 24 which may be fixed to rotate with the blades I6. Surrounding the impeller 23 is a control member 25 having a discharge opening 26. The control member is mounted independently of the blades I5 and may be adjusted to shift the clock dial position of the discharge opening 26 where by the abrasive discharged from the wheel may be 20 directed as desired. Suitable supporting means such as side plates I1 and I8 may be provided for the blades I6. The wheel I5 may be mounted part thereof, in which: a side elevational view of one form of suitable for carrying out the present certain of the parts being shown 20 broken away andin section in order to expose to view certain interior details of construction; Fig. 2 is an enlarged transverse cross vsectional view of the apparatus taken along line 2--2 of Fig. 1; for rotation on a hub I9 carried on a shaft 20 Fig. 3 is an enlarged end elevational view of the apparatus shown in Fig. 1; Fig. 4 is an enlarged perspective view of one which may be mounted in bearings 2| on the of the conveyor roll blocks; Fig. 5 is a fragmentary side elevational view 30 showing a modified form of apparatus employing rotatable supply and discharge mechanisms, por tions of the apparatus being shown broken away to expose the interior; , Fig. 6 is a longitudinal cross-sectional view of the apparatus taken along the line 6-6 of Fig. 5; Fig. '7 is a fragmentary transverse cross-sec tional view showing a modified form of apparatus employing a modified type of conveyor rolls; and Fig. 8 is a transverse cross-sectional view of the apparatus of Fig. 7, this view being taken along line 8-8 of Fig. 7. In the following description and in the claims, various details will be identified by speciñc names for convenience, but they are intended to be as generic in their application as the art will permit. Like reference characters denote like parts in the several figures of the drawings. In the drawings accompanying and forming part of this specification, certain specific dis -50 are preferably rotated in opposite directions, whereby to increase the angular range of the components of the abrasive streams. jects and advantages, and the manner in which it may be carried out, may be better understood forming a Fig. 1 is apparatus invention, 25 streams extend over substantially the entire length of the conveyor 5. Where a plurality of projector wheels are employed, certain of them. closures of the invention is made for purposes of explanation, but it will be understood that the details may be modified in various respects with out departure from the broad aspect of the in vention. Referring now particularly to Figs. 1 and 2 of the drawings, there is shown apparatus including a housing I having an inlet 2 and outlet 3 and a conveyor 5 extending longitudinally through the housing from the inlet 2 to the outlet 3. Pro 60 jecting into the inlet 2 is a charging vestibule- 6, having an inclined floor 1, the vestibule being closed by one or more flexible curtains 8. Ex-_ tending from the outlet 3 is a discharging vesti bule I0 having a downwardly inclined floor II, the vestibule being closed by one or more flexible v65 curtains I2. suitably mounted in position to project a stream of treating material into the housing I is a centrifugal abrasive projector wheel A, here 70 inafter more fully described. A suitable number of additional projector wheels B and C may be top wall of the housing I. 'I'he wheel A may be driven from a suitable source of power, such as a motor 3l, connected through a suitable drive, such as belt drive 32, to the shaft 20. Upon energization of the motor 30 3I, the impeller 23, side plates I1 and I8 and throwing blades I6 are rotated as a unit, the con trol member 25 remaining stationary. Suitable treating material, hereinafter referred to as “abrasive” is supplied to the wheel through a feed pipe 33 extending through an opening I4 in the side plate I'I and terminating adjacent the im peller 23. The abrasive may be stored in a suit able hopper (not shown) preferably located at a higher level than the wheel so that the abrasive 40 can flow from the wheel by gravity through a suitable pipe such as the pipe 34. It is to be understood that the term “abrasive” as herein used is intended to include suitable treating material both that which is inherently abrasive and that which exerts a smoothing and polishing action. The abrasive may include smooth steel shot, cracked steel grits, quartz sand or other granular materials suitable for cleaning, polishing, hardening or otherwise modifying the surface characteristics of the articles treated. When the wheel is rotated as described and abrasive is supplied thereto the abrasive is hurled by impeller 23 through the opening 26 in the con trol member 25 and into the path of the rotating throwing blades I6. The abrasive is urged along the leading faces of the throwing blades I6 and projected therefrom adjacent the periphery of the wheel I5 by combined centrifugal and radial forces. The abrasive spreads out in a fan-like stream having components extending throughout a considerable range of angularity in the plane of rotation of thewheel I5. The stream forms an elongated, generally rectangular impingement pattern on a horizontal plane disposed below the wheel and extending lengthwise of the conveyor. Other factors remaining constant, the direction of flight of the abrasive may be adjusted by suit able adjustment of the clock dial position of the control member 25. Also, the direction of the stream may be altered by mounting the Wheel for provided, if desired, as for example, where it is ' rotation in a reverse direction. desired to provide apparatus of relatively large capacity. Preferably, suflicient projector wheels 75 are provided so that the treating stream or A suitable opening 21 is provided in the top wall o-f the housing I to permit the abrasive stream a to be projected into the housing and 75 2,131,768 3 against the castings or articlesÍsupported upon the conveyor 5. If desired, the wheel'may beso mounted that a portionl of the wheel projects into the housing. -A suitable housing' 28 may be pro "vided for enclosing the upper portion of the. Bearing 6I is preferably mounted in a bearing wheel, and one or more baille plates 36 may de housing I for repair or replacement. C_arried pn one end of each shaft 5I isa sprocket pend _from the top wall of. the housing I to pro-I housing 62, detachably supported in an opening 59 in the end wall 63 of the housing. Preferably, the opening 59. is `of sufficient size to permit the corresponding roll 5!)v to be removed from the tect various adjacent portions of the housing. If , 64. The sprockets 64 may be .driven from a suit- . desired, certain of the portions» of the apparatus able source of power, such as a motor 65,‘which 10 which are subject to wear by _reason of flying or 4may drive a speed reducer 66 and a suitable drive 10 ' rebounding abrasive particles may be covered 61 connected to a shaft 68 mounted inl bearings 69 ywith protective jackets or the „like formed of on the top wall of the housing I. Carried on the resilient material such as rubber or rubber fabric. forward lend. of the shaft 68 is a sprocket ‘I6 Disposed below Ithe conveyor 5 is a floor which around which is trained a chain 1|,.also trained .15 may be shaped to form a hopper 35 adapted to over all of the sprockets 64. -Upon energization of 15 receive and collect abrasive which has been dis the motor 65, the shaft 68 is rotated and allA of the charged from the wheel. A conveyor, such as the sprockets 64 are driven to rotate their respective screw conveyor 36, may be disposed in the hopper shafts 5I and thus rotate the rolls 56 in the desired for conveying the spent abrasive out of the hous- „ 20 ing I. A transverse trough 38 in which is dis manner. l An end head or wall member .86 may be mounted 20 posed a screw conveyor 39 may be provided for " adjacent the charging end (right-hand end as conveying the spent abrasiveffrom the hopper'35 viewed in Fig. 1) of the conveyor 5 for preventing articles from dropping oiî the conveyor at thisv end. The head 86 may includeda circular facing member 8| carried by a plate 82 connected as by studs 83 to a plate 84. The head4 86 may-be fixed to an elevator 4I, which may be disposed outside ofthe housing I for returning the spent abrasive 25 to the storagehopper (not shown). The screw conveyors 36 and 39 and the elevator 4I may have ' sprockets 31, 46 and 62 respectively attached t hollow hub 85 rotatably mounted on a stub thereto, and suitable driving'means may be pro si. ift 86 by a bearing 81 which may be 'a roller or vided for driving the sprockets whereby to actu ‘ball bearing. The stub shaft 86 is journaled in a » 30. ate the elevating apparatus. The conveyor 5 preferably is formed from a plurality of generally parallel and closely spaced rolls 56 _extending longitudinally within the hous ing I and arranged to form an arcuate trough 35 like'supporting surface disposed under and in the path of the abrasive streams a, b and c. Prefer ably, the conveyor is arranged so that the lower most portion lies directly under the abrasive ing. A suitable take-up device 89 may be provided for maintaining the shaft 86, bearing 81, and hub 85 tight relative to the bearing 88. The head 86 is rotatable and hence when the rolls 56 are driv eney for the articles tqjam or unduly rub against the head, but the latter rotates as much as neces the conveyor may be considerably higher than the other, as will hereinafter appear. a, b and c against articles supported on the con ` Each roll 56 may comprise a shaft' 5I carrying a ` plurality of blocks 52 arranged on the shafts in staggered arrangement. Referring particularly to Fig. 4, each block> may be formed as an oval disc and may .have a central boss 56 projecting from each sideïface. 35 en to tumble the >articles about there is no tend sary to permit free tumbling of the articles. The operation of apparatus is as follows: The projector wheels A, B and C are operated in the manner described to project abrasive streams streams a, b and c and the side walls extend up wardly therefrom on both sides. One side wall of 30 bearing 88 mounted on the end wall 68 of the hous veyor 5, the stream c being directed reversely rel atively to the streams a and b. The articles to be treated are deposited in the charging vestibule 6 45 and slide along the floor .'I and tumble on to the conveyor 5. The motor 65 is energized and drives A rectangular opening 55 ~ the rolls 58 to tumble the articles on the trough- i may extend through the centralportion’of the block 52 for receiving the rectangular portion. 56 50. of the shaft 5I. Oneface of the block 52 may be formed with tapered faces 51 and 58 adjacent like surface provided by the rolls 56. The rolls- 56 are driven in synchronism so that the ends of the 50 blocks 52 successively strike against-each article and impart an impulse thereto in a direction. (to _ the `ends 'for the purpose ofl exerting a sidewise ' the right as shown in Fig. 2) to cause the article pushing action on the articles treated, as herein 55. to travel upwardly along the'side wall of the con veyor. When the article climbs upwardly along 55 A series of blocks 52 are disposed on the rec the side wall of the conveyor to a position where-` tangular portion‘5‘6 of each shaft with the faces . in they exceed their angle of repose, they tumble of the bosses 54 of adjacent blocks substantially down over the ascending articles toward the low after more fully. pointed out. 1 e abutting. lThe blocks 52 on each shaft are ar ranged substantially perpendicularly to the shaft ermost portion of the conveyor. h This action is re 60 on which they are mounted, each block being peated and each article is carried along a sub 60 ` stantially continuous path up along the side of the preferably arranged at .approximately a 90° angle to the adjacent blocks. This arrangement of blocks provides a roll having spaced projections -formed by the ends of the blocks. 'I'he rolls 50 65 are suitable mounted so that the _high portions of each roll, formed by the ends of the blocks, are positioned opposite the low portions of the adja cent rolls- thereby permitting the blocks of each roll to clear the blocks of the adjacent rolls when " the rolls are rotated. conveyor-and backwardly vover the ascending arti cles a large number of times. When each block engages one of the articles tu drive it upwardly, the inclined face 51 or 58 (as 65 the cas‘e may be) imparts an impulse to the article in a direction longitudinally of the conveyor (to the left as viewed in Fig. 1) to advance the arti cle along the conveyor. Thus the articles are both tumbled about and advanced along the con 70 veyor by the action o'f the rolls. / Each shaft tlv ismounted in ‘a suitable bearing _ As the articles advance along the conveyorithey A 6I)ì in one end of the housing and a second bearingA are struck by particles of abrasive traveling at 6I at the other end of the housing. Either or highl speed which cleans, polishes, hardens or - both of thebearings 6I may be roller-bearings. otherwise treats the surfaces of articles accord 75 4 2,131,768 ance with the nature of the particles used. Since the abrasive streams a, b 'and c have components extending throughout varying angles, and since the particles are tumbled about in the trough, the articles are struck by abrasive from various angles and thus all portions of the surfaces, including cavities and projections, are fully treated. When the articles reach the discharge end of the cori veyors they are forced into the discharge vesti in a manner generally similar to the drum shown in Fig. 5 and described above: 'I'he conveyor |49 may comprise a plurality of rolls |50 of generally cylindrical form, the ends 4of the rolls |50 terminating in shaft portions |53 mounted for rotation in suitable bearings |52 suitablysupported atthe ends of the housing |40. Each roll |50 may be provided with spaced and generally spiral-grooves I 5I extending partially bule I0 and slide along the iioor II and are dis- ' around the roll. charged from the apparatus. If desired, suitable automatic apparatus may be provided for con veying the articles away from the treating appa ratus. 15 «Referring now to Figs. 5 and 6 there is shown apparatus provided with modified charging and discharging mechanisms for supplying the arti cles to the conveyor and removing them there from in an effective manner. The apparatus may 20 be provided with 'one or more abrasive projector wheels and a conveyor_||3 generally similar in construction to those above described. The for ward end of the conveyor is open and the adjacent wall of the housing 99 is formed with an opening 25 |00 through which projects the charging drum |0I. The charging drum |0| is rotatably mount ed on a plurality of rolls |05 freely rotatable on pins |06 carried by spaced arms |01 of a sup 30 porting frame |08.- The rolls |05 may be formed with peripheralgrooves |04 adapted to receive circumferential flanges |03 formed on the out side of the drum |0| and spaced suf?ciently to support the drum |0| in stable position on the rolls |05. 35 tation of the shaft |09 the drum .I 0| is correspond ingly rotated. ` Each roll |50 may be driven from one or both ends thereof by a sprocket |54 fixed to the shaft ' 16 portion |53 of each roll. The sprockets |54 are driven synchronously from a suitable shaft |60 mounted in one or more bearings |6I. 'I'he shaft i60 carries a sprocket |62 and a chain |63 is trained over the sprocket |62 and all of the 20 sprockets |54. Upon rotation of the shaft |60 the sprockets |54 are driven and the rolls |50 'driven in synchronism. The articles to be treated are deposited on the conveyor |49 by the drum |55 or in any other 25 suitable manner. The side Walls of the grooves | 5| provide moving, inclined abutments which engage the articles and advance them upwardly along the side Walls of the conveyor in a manner analogous to that described in connection with 30 the apparatus shown in Fig. 1. 'I'he grooves being inclined, also exertîa force on the articles longitudinally of the conveyor tending to lad The drum |0I may be provided on its inner sur ously with the tumbling action. Abrasive is pro 35 jected against the articles in a manner similar to that above described and the articles may be discharged from the other end of the conveyor in any suitable manner. 'I'he present invention provides apparatus 40 whereby articles may be eñectively and continu ously treated by a stream of granular treating material for the purpose of .modifying the sur face characteristics of. the articles in various manners. The articles may be supplied continu face with inwardly projecting, inclined lugs |02 ously to the apparatus, and the latter need notA 45 disposed in staggered or echelon arrangement.v be shut down except for repair or adjustment. Upon rotation of the drum, articles which are de posited therein are given a forward movement by 50 the inclined lugs |02 and advanced along the drum I 0| and finally are deposited on the conveyor H3. If desired, a drum |20, similar to the drum |0| may be provided for discharging the articles from the conveyor H3. 'The drum |20 may be con structed, mounted and driven in a manner similar to the drum |0| except that the lugs |02, thereon are arranged to carry the articles out of the ap paratus. The drum |20 preferably is mounted so that the lowermost portion of the ñoor of the 60 of adjacent rolls. vance the articles along the conveyor simultane ' The drum |0| may extend into the housing 99 and overlie the forward end of the conveyor H3, whereby articles may be advanced by the drum I0| and deposited on the conveyor I I3. The conveyor H3 may `be driven from a shaft |09 carrying a 40 sprocket I I0 and a chain III may be trained over the sprocket I l0 and over a circumferential ring -‘sprocket H2 secured to thel drum IOI. Upon ro 45 The rolls |50 are mounted so 10 that the grooves |5| of adjacent rolls |50 are ofi set or ‘in'echelon arrangement~ with the grooves drum is level with thelowermost portion ofthe floor of the trough provided by the conveyor H3. Since the articles are tumbled about in the stream, all of the articles and all portions of the ì surfaces of each article are fully‘ and completely 50 treated. The articles are positively tumbled and positively advanced and the period of treatment may be closely controlled. . The apparatus provided by the present inven tion is relatively simple and rugged and is posi 55 tive in operation. 'I'he rolls and other portions of the apparatus which are subject yto severe wear'from the treating material can be quickly and easily removed for the purpose of repairing or replacing these parts. The apparatus „is rela 60 tively automatic inl operation and can be oper Thus as the articles reach the end of .the con ated with the minimum of attention on the part veyor H3 they are depositedin the drum |20 and of the operator. The apparatus may be em are carried away from the end of the conveyor ployed with suitable automatic apparatus for I I3. The drum |20 may be arranged to discharge ' conveying the articles to be treated to the treat the articles into a suitable receptacle‘or o'n the ing apparatus and removing them therefrom so floor adjacent to the apparatus or onto asuitable that the treating apparatus may be installed as a component part of. relatively continuous pro; 4Referring now to iFigs. 7 and 8, there is shown duction line. .70 a'modifled form of apparatus having a conveyor While certain novel features of the invention of somewhat modiñ'ed cconstruction adapted to have been disclosed and are pointed out in the 70 han’dle eiiiciently relatively small articles. 'I'he annexed claims, it willrbe understood that vari ap aratus may be generally similar to that de ous omissions, substitutions and changes may sc bed in Fig. 1 and, if desired, may be provided be made by those Askilled in the art without de conveyor. 'u . ' Y with a drum |55 constructed, mounted and driven : parting from the spirit of the invention. 75 5 . 2,131,768 Y What I claim is: 7. Apparatus for treating metal articles in , 1. .Apparatus` for treating metal articles in cluding, means for projecting a stream of abra sive material, a concave supporting surface de 5 fined by a series of longitudinally extending cluding, an abrasive-throwing wheel for pro jecting a fan-shaped stream of abrasive particles, a conveyorl for tumbling articles in and through said'stream of abrasive particles, said conveyor having a generally arcuate supporting surface members, and means for imparting movement greater than 90° but less than 360° in extent " to said members for effecting a tumbling move ment of the articles _treated across said members, defining therebetween- a longitudinal opening and projections on‘said members for advancing , through which the abrasive stream is projected io said articles along said surface and through said. stream. ^ i ' 2. Apparatus for treating metal articles includ against the articles supported upon said arcuate surface, a drum disposed adjacent and extend ing to said conveyor, a plurality of inclined abut-y ing, means for projecting a streamv of abrasive' ments on said drum, and means for rotating said particles, three -or more individually movable 15 supporting elements, means mounting said ele ments out of line to define a concave supporting pocket for the articles to be treated, and means for rotating said elements individually whereby to tumble said articles in said pocket and advance 20 them through said stream. 3. Apparatus for treating metal articles in cluding, means for projecting a stream of Vabra sive particles, a series of individually movable ` elements, means mounting said elements' in a series to form a supporting surface for supporting articles to be treated, spaced projections on said elements,. and means for rotating said elements ' whereby said spaced projections impart a tum bling movement to articles and advance them through said stream. ‘ ’ 4. Apparatus for treating metal articles in cluding, means for projecting a stream of abra sive particles, a series of individually movable rolls each including a' shaft having a plurality of .35 non-circular blocks mounted thereon, means - y mounting said rolls in proximity to ea'ch other . whereby saidblocks form a supporting surface for`the articles to be treated, and means for rotating said rolls individually whereby said blocks engage said articles and'impart impulses thereto whereby to tumble said articles about in said stream. ,5, Apparatus for treating metal articles in '_ cluding, means for projecting a stream of abra sive particles, a vseries of individually movable rolls each having a plurality of spaced projec tions thereon forming abutments, means mount ` ing said rolls in out ‘of line relationship so that ` the peripheries thereof form a concave sup porting pocket for the articles to be treated, and means for rotating said rolls whereby said abut ments engage articles to be treated and tumble the same over the rolls and advance the same lalong said rolls and through said. stream. v6. Apparatus for . treating metal articles, means for projecting a stream of abrasive par ticles including, a series of rolls each having a plurality oi' abutments thereon, means mounting ` said rolls to form -a substantially continuous supporting surface, andv means for rotating said rolls whereby said abutments> effect a tumbling movement of said articles on said supporting sur faceand in said stream. ‘ ' drum, whereby said abutments engage the ar ticles to be treated and advance them along said 15 drum to said conveyor-for treatment, said wheel being so arranged that the particles constituting said fan-shaped stream will strike the^article at different angles- during the tumbling move ment thereof. y 20 ` 8. Apparatus for treating metal articles, in cluding, means for projecting a fan-shaped stream of. abrasive particles, a conveyor for tumbling articles through said stream of treat ing material, said projecting means being so 25 arranged that the particles constitutingA said abrasive stream impinge the article at different angles during the tumbling movement thereof said conveyor having a generally arcuate sup porting surface greater than 90° but less than 30 360° in‘extent- defining therebetween a longitu dinal opening through which the abrasive stream is projected .against the articles supported upon said arcuate surface, a drum disposed adjacent and extending from said conveyor in position to 35 receive articles from said conveyor, a plurality of inclined abutments on said drum, and means for rotating said drum whereby said projections ad vance the articles to be treated along said drum and away from said conveyor. ` 40 9. Apparatus for abrasively treating metal articles including, a conveyor presenting a trough-like supporting surface, means for im parting a combined lateral shifting, raising and downward tumbling movement and a forward 45 advancing movement of the metal articles on said surface, an abrasive throwing wheel mount edïin position to throw a fan shaped stream of treating particles> against the articles ön s'aid. surface, means for rotating said wheel, a second 50 wheel disposed in position to throw a second fan shaped stream of treating particles against said articles, and means for rotating said second wheel oppositely to said ñrst wheel whereby to project a second stream oppositely‘to said first 55 stream, said wheels being arranged to project their vrespective abrasive streams against the articles during tumbling and advancing move ment thereof with 'the particles of each stream striking the articles at diiïerent angles during 60 the advancing vmovement thereof. ' DAVID C. TURNBUIL.