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Oct. 4, 1938. c. H. HAMMELL ‘ TUMBLING MILL Filed March 7, 1953 "Mb ' 2,131,732 ' 3 Sheets-Sheet l w _ / lNvENToR ' ATTORNEY Oct. 4, 1938. . ' c. H. HAMMELL TUMBLING @fr MILL Filed March 7, 1953 ' ` 2,131,732 ’ 3 Sheets-Sheet 2 3 Il u a) . BY INVENTOR Ä Hummel! / www ¿ma ATTORNEY ' Oct. 4, 1938. c. H. HAMMELL " ' _ TUMBLING MILL Filed March 7, 1933 2,131,732 l ‘ 3 Sheets-Sheet 3"' Y 64 ATTORNEY Patented Oct. 4, 1938 ' 2,131,732. UNITED STATES PATENT OFFICE TUNIBLING MILL ' Charles H. Hammell, Mishawaka, Ind., assigner to The American Foundry Equipment >Com pany, Mishawaka, Ind., a. corporation of Dela Ware . 'Application -March 7, weasel-_iai No. 194,309 o 16 Claims. and a movable side wall provided by the conveyor. The tumbling barrels thus formed between the discs are positioned equidistant from each other and radially from the horizontal axis of the wheel formed by thevdiscs. Consequently, the 5 This invention relates to tumbling mills for cleaning and smoothing castings, forgings and the like. ` f In cleaning, polishing, hardening or otherwise 5 treating small metal articles such as’castings, barrels may travel in a circular orbit when the forgings and the like, the process may be carried - large conveyor supportingïwheel rotates on its out in a tumbling mill in which the articles are placed and subjected to the action of projected axis. Additionally, the conveyor belt may be caused abrasive particles while the articles are being tumbled. ' to travel when the large wheel carrying it is l0 . When a single tumbling barrel is used it has been common practice to charge the articles to be treated into the barrel when the supply of stopped for the purpose of tumbling articles in the barrels thus formed when they are in the cleaning position and to assist in discharging cleaned articles from the barrels when the barrels are in the discharging position in their orbit of 16 projecting abrasive is shut off. After charging 'the barrel, the abrasive may be projected with suñicient impact to clean the articles such as travel about the common horizontal axis of the . , castings while they are being tumbled. After the >large wheel. The _wheel assembly is arranged for step by ‘articles have been treated the requisite length of step rotation, if desired, thus to stop the barrels time, the discharge of the treated castings re quires shutting off the abrasive supply while the' intermittently >at predetermined positions in their 20 tumbling barrel is being unloaded. It is, there y,orbit of travel. Mounted above the wheel are fore, desirable to avoid these shut downs and abrasive throwing devices positioned to project maintain the abrasive throwing mechanism in abrasive into one or more of the barrels to clean operation continuously whereby to do active work castings or other articles therein while they are being simultaneously tumbled by the travelling 25 25 without the necessity of relatively long shut downs ` conveyor. Provision is made to charge an empty incident to charging and discharging the tum bling barrel operating on the so-called batch barrel at another position or station in the orbit .while the cleaning operation just mentioned is system. proceeding. Further provision is made to dis The present invention accomplishes the fore going desirable end by providing a plurality of charge at the same time treated castings at an- 30 , pockets or tumbling barrels mounted so as to be other station. Moreover, suitable means are provided for re capable of being b-rought successively in and out moving .the abrasive which has been projected of the path of abrasive' projected at blasting ve locities. Provision is made to charge the barrels into the mill and for returning it to the abrasive consecutively at a predetermined position while projecting mechanism whereby the abrasive can 35 the barrels which have been charged are receiv ing abrasive cleaning treatment at another posi tion> or positions in the path of travel of the barrels. Simultaneously a barrel containing treated articles may be discharged at another position. Thus, the cleaning or blasting action may be continuous and the time incident to charg ing and discharging is not spent at the expense of shutting down the abrasive projecting mecha msm. According to one form of the invention, the mill comprises a stationary casing in which is positioned a relatively large conveyor supporting - wheel made up of two discs or frames in parallel spaced relation mounted to rotate on a horizontal axis. A continuous conveyor or belt is trained over sprockets mounted in the discs and over ro tatable barrel heads also mounted on the discs. These are arranged to form, in effect, a plurality 55 ' of tumbling barrels each having rotatable heads be used in a continuous cycle. The invention also consists in certain new and original features of construction and combina tions of parts hereinafter set forth and claimed. Although the novel features which are believed 40 to be characteristic of this invention will be par ticularly _pointed out in the claims appended hereto, the invention itself, as to its objects and advantages, and the manner in which it may be carried out, may be better understood by refer- 45 ring to the following description taken in con nection with the accompanying drawings forming a part thereof, in which: Fig. 1 is a view partly in elevation and partly in section of one form of mill according to the 50 invention; ' y Fig. 2 is a View in cross-section on line 2-2 of Fig. l; ` Fig. 3 is a view in cross-section on line Fig. 2; and . - 3-’3 of 55 2. 2,181,739 Fig. 4 is a view in part in elevation of one disc of the wheel assembly. In the following description and in the claims, various-details will be identified by specific names for convenience, but they are intended to be as generic in their application as the art will per mit. Like reference characters denote like parts in the several figures of the drawing . ' Referring to the drawings, the conveyor sup 10 porting wheel assembly may be mounted on ñxed stationary hollow stub shafts I0 and II which may be supported in heavy pedestals I2 and I3 resting on a suitable foundation or heavy cross beams. 'I‘hese hollow shafts are large 15 enough to accommodate a screw conveyor I4. By connecting the inner ends of the stub shafts I0 and II which have a common axis with a pan I5 a trough is formed to catch abrasive which may be returned to a feed hopper I6 through 20 suitable‘conduit and elevator means. Two side wall members which may be in the form oi' discs I1 and I8 _may be mounted in par allel spaced relation to rotate on suitable bear ings which may be roller bearings I9 and 20 posi The continuous conveyor belt may be. of the link type carrying on each side, link sprocket chains 4I and 42 running over sprockets 23 and 24. A suitable construction for such a belt is disclosed in Letters Patent to Louis D. Peik. No. 1,882,443. - From the foregoing description it will be ap parent that the continuous conveyor belt, to gether with the rotating barrel heads form a plu rality of individual pockets or tumbling barrels 10 mounted in the wheel assembly as shown gener ally in Fig. 2. In order that the wheel assembly 28 may be caused to rotate intermittently or by a step by step movement about its axis of rotation a plu 15 rality of lugs 43 (see Fig. 4) may be mounted on the side wall disc I8 in a circular path. A spring pressed stop pin 44, mounted in the side wall 45 of the housing or casing 46, in which the wheel assembly is mounted, may coact with 20 the lugs 43 to stop the movement of -the wheel assembly. Thus, when the stop pin 44 is allowed to engage the side wall I8 of the wheel a. lug will engage the pin and prevent movement ,of Hence, when the drive 25 chain 25 is driven by the motor 28, sprockets 29 25 tioned at the inner ends- respectively of hollow ‘the wheel assembly. 30 35 40 45 shafts I0 and II. These side wall members may be connected by shafts 2| and 22, each shaft car- Y cause the sprockets 23 and 24 on shafts 2I and rying spaced sprockets 23 and 24 fixed thereto. 22 to rotate with consequent linear movement of The assembly forms a conveyor supporting wheel the conveyor belt 34. 'I'he .lugs 43 are spaced rotatable on a common axis of rotation through to stop the respective tumbling barrels at pre the centers of the shafts I0 and II. Each of the determined stations in the orbitof their revo shafts 2| may be provided with a sprocket 29 lution about the axis of rotation of the wheel mounted on the outer side of the side wall mem assembly. When the stop pin 44 is pulled out ber I1. A chain drive 2_5 (indicated by dot and and disengaged from the stop lugs the wheel dash line) is trained over the sprockets 28 and assembly will rotate because the resistance of the may be driven by a motor 28. An idler 21 may lrelatively heavy conveyor belt 34 will permit the be provided to keep the chain drive 25 taut. drive chain 25 to rotate the wheel assembly on v Between the side wall discs I1 and I8 there the shafts I0 and -I I unless means are provided may be mounted a plurality of pockets or tum to stop its rotation. bling barrels each of which may comprise a pair If desired the stop pin 44 which is manually of spaced barrel head members 30 and 3I rotat operated may be dispensed with and other means ably mounted in `journals 32 and 33 in the wheel provided for the rotation step by step of the side walls I1 and I8 respectively. 'I'hus each wheel assembly. An annular gear 41, which may pair of barrel heads rotate on a common axis. be made of segments, may be fixed to the periph Eight of such pairs of barrel heads are shown ery of the side wall disc I 8. This gear may en although a greater or less number may be de gage a pinion 48 fixed to a shaft 49 driven by a sirable in particular cases. It will> be apparent motor 58 connected with a suitable drive 5I. An from the drawings that the axes of rotation of electrical relay and timer (known in the art) foi` the respective pairs of barrel heads are equi stop, pause and start operation may be connected distant radially from the axis of rotation of the with the motor 50 and suitable contacts corre wheel assembly (designated generally by the ref erence character 28) and they are also equally spaced apart. To form the side walls of the respective tum 55 bling barrels of which the pairs of barrel heads 30 and 3| constitute the end walls, a single con tinuous link belt 34 may be trained over the sprockets 23 and 24, and the rotatable barrel heads 30 and 3I. Each barrel head may have 60 an annular offset flange 35 on its periphery and each barrel head may have a liner plate 36 re movably secured thereto, the liner plate '38 with the offset flange 35 forming a circular groove 31 to accommodate flanges on the link belt 34 to 65 guide the link belt and to provide for rotation of the barrel heads when the conveyor belt is moved linearly; that is, in a direction over the sprockets 23 and 24 and the barrel heads 38 and 3|. Arcuate tracks 99 and 99 may be fixed on 70 the side wall discs I1 and I8 to assist in guiding the conveyor belt 34 and to hold the slack. Seal plates 39 and 40 may be provided on the periph ery of the wheel as a partial protection to the sprockets 23 and 24 and the conveyor belt chain ' 75 drives 4I and 42. sponding to lugs 43. 30 35 40 45 50 Abrasive projecting mechanism such'as one or more centrifugal abrasive throwing wheels 52 and 53 may be mounted in the roof 54 of the housing or casing 48m such manner as to project abra sive at blast cleaning velocities into the casing 55 and in the path of travel of the tumbling mills or pockets of the wheel assembly. It is preferable to project the abrasive in a downward direction into the tumbling barrels (as shown generally in Fig. 2) for cleaning articles which may be more conveniently tumbled when the curvilinear por tions of the segments making up the side walls of the tumbling barrels form the necessary holding pockets. It will be apparent that articles such as castings and forgings in the uppermost barrels 65 will be tumbled when the conveyor belt 34 is caused to move linearly, particularly when the wheel assembly 28 is not in rotating motion. The stationary hollow shafts I0 and II support a suitable pan or trough I5 which catches the 70 major portion of abrasive projected into the uppermost tumbling barrels since the link belt 84 provides ample slots or spaces to permit the used abrasive to fall through into the central trough 75 i mismas n I6. A screw conveyor I4 mounted to rotate In the hollow shafts I0 and II carry used abrasive into >the elevator shaft 66 through which it may - 3 , veyor belt 34. While the cleaned castings are thus being discharged, uncleaned castings may be charged into >a barrel opposite’they charging ‘ be elevated to the’ feed hopper I6 through another , door 68', and simultaneously the castings in the \ conveyor >90 and> again passed to the abrasive _ barrels beneath the throwing'wheels are being cleaned. The operation may be carried on con projecting mechanism. ' „ In addition to the central abrasive trough I5 tinuously step by step without the necessity of another abrasive collecting trough 51 may be stopping the flow of’projected abrasive which is provided in the lower portion o_f the casing 46. returned and recycled through the throwing This trough may likewise be provided with a screw conveyor 58 to carry abrasive, projected wheels. into the casing and not caught by the central trough I5, into the elevator shaft 56. The two screw conveyors I4 and 58 may be driven by a 15 motor 59 suitably connected by drive chains 60 and 6I over sprockets 62, 63 and 64. , ’ Radially disposed baiiies> 65 may be mounted between the side wall discs I1 and I8 to direct abrasive into the trough I5. Additional bañies 66 and 61 may be fixed to the casing walls to avoid undesirable splattering of the abrasive towardV the charging and discharging doors described , hereafter. The-casing 46 may be provided witha lift type charging door 68 positioned in the side wall 69 of the casing. A charging platform 10 may be ñxed to the casing.- It facilitates charging articles to be cleaned into the tumbling barrel opposite the charging door 68. » l A. discharge opening 1I having a discharge chute 'I2 may be provided in the opposite side Wall 13 of the casing. Itv will be apparent that articles in the tumbling barrel opposite this dis charge opening will be carried out of the barrel 35 into the chute when the conveyor belt 34 is caused tov move linearly in the direction of the arrow 'I4\. 30 Operation 40 45 50 55 10 ~ Thus, a continuously operating tumbling mill» may be provided which will effect great _savings in time incident to cleaning as compared with a cleaning apparatus wherein a single barrel only is used, there being, according to the invention, no 15 necessity for the throwing wheels to remain idle at any time during the operation of the con-y tinuous mill. , While certain novel features of the invention `have been disclosed and are pointed'out in the 20 annexed claims, it will be understood that var'i ous omissions, substitutions _and lchanges may be made by those skilled inthe art Without depart ing from the spirit of the invention. What is claimed is: v , . - 25 , l. In apparatus of the character described, a conveyor `supporting wheel mounted to rotate about an axis, means mounted on said wheel to train a conveyor belt, a conveyor. belt trained by the aforesaid means to form a plurality of tum 30 bling barrelsfdisposed about the axis of rotation of said wheel, means to move said conveyor belt along the path of travel provided by said train ing means, and means to rotate said wheel about its axis of rotation whereby to revolve said bar 35 rels in an orbit about saidv axis of rotation. 2. In apparatus of the character described, a conveyor. supporting wheel comprising spaced The tumbling mill may be operated as follows: The wheel assembly may be adjusted to take apart side frames mounted to rotate about a common axis, means including discs spaced apart 40 the position shown generally in Fig. 2. The mounted on said sidewalls to train a conveyor, abrasiveconveyors I4, 58 and 90 together with a continuous conveyor trained by said means to the necessary elevator in shaft 56 are placed in 'form a plurality of tumbling barrels revoluble in an orbit about vthe axis of rotation of said wheel, operation. The tumbling barrel opposite charg ing door 68 is charged with a suitable quantity of means mounted on said wheel to move said> con -45 veyor along the pathl of. travel provided by said articles, such as smallcastings |00. The con veyor belt 34’ is placed in operation. The wheel training means, and means to rotate said Wheel assembly may then be caused to rotate a step in whereby to revolve said barrels in said orbit about the.v direction of the arrow 29a so as to bring the the axis of rotation of said wheel. 3. In apparatus of the character described, a 50 charged barrel under the centrifugal abrasive throwing wheel 52 which is placed in operation. stationary casing, a. conveyor supporting wheel The next successive barrel is charged through the comprising side walls spaced "apart in parallel charging door while the articles |00 are being relation mounted to rotate within said casing subjected to the projected abrasive. The wheel about a> common axis, means including discs` assembly is then caused to rotate another step spaced apart in parallel relation and rotatable 55 thus to bring the first charged barrel under the about another axis of rotation to train a conveyor, abrasive throwing'wheel 53 which is placed in a continuous link conveyor trained in part by operation. While the castings in the barrels beneath the throwing wheels are being tumbled by reason of ,60 the linear movement of the conveyor belt 34 and simultaneously subjected to the projected abra sive, the next successive barrelis being charged through the charging door 68. After the articles are given the requisite clean 65 _ ing by the abrasive projected by the throwing wheels, the conveyor supporting wheel assembly said rotatable discs to form a plurality of tum bling barrels revoluble about the axis of rotation of said wheel, means mounted on said wheel to 60 move said conveyor linearly along the path of travel provided by said training means, and means to rotate said wheel step by step to revolve said Ábarrels intermittently in an orbit about the axis or"V rotation of said wheel. - ' 4. In apparatus of the character described, a conveyor, means for training said conveyor to is caused to move another step, thus bringing a form.-a plurality of tumbling pockets, projecting barrel containing cleaned castings opposite the mechanism to discharge abrasive atblasting ve locities, means for moving said pockets into and out of the path of abrasive discharged from said projecting mechanism, and means to move said conveyor to tumble articles within said pockets 70 " discharge chute 'I2 and at the same time an empty barrel opposite the charging port 68. It will be observed that the barrel opposite the discharge chute takes a position which is analo gous to tipping the barreland the cleaned articles 75 are carried out by the linearly travelling con .when in the path of abrasive discharged at blast-ling velocity from said projecting mechanism. 75 i. 4 2,181,789 5. In apparatus of the character described, a conveyor belt, means including rotatable barrel heads for training said conveyor to form a plu rality of tumbling barrels, projecting mechanism to discharge abrasive at blasting velocities, means for moving said barrels in an orbit into and out of the path of abrasive discharged from said pro jecting mechanism, and means to move said con veyor belt to tumble articles within said barrels 10. when in the path of abrasive discharged at blast ing velocity from said projecting mechanism. 6. In apparatus of the‘character described, a link belt movable linearly, means including rotat able barrel heads mounted on a. rotatable frame 15 for training said conveyor to form a plurality of tumbling barrels on said rotatable frame, means for moving said barrels in an orbit about the axis of rotation of said frame, and means to move said belt linearly to tumble articles within 20 said barrels when'in the path of abrasive dis charged at blasting velocity on to said articles. 7. In apparatus of the character described, a conveyor, means for training said conveyor to form a plurality of tumbling pockets, projecting 25 mechanism comprising a centrifugal blasting wheel to discharge abrasive at blasting velocities, means for moving said pockets into and out of the path of abrasive discharged from said blast ing-wheel, means to move said conveyor to tumble 30 articles within said pockets when in the path of abrasivedischarged at blasting velocity from said blasting wheel, and means to return used abrasive to said blasting wheel. 8. In a tumbling mill, a’frame rotatable on an axis, -a plurality of receptacles mounted on said frame revoluble in an arc about the axis of rota tion of said frame, each of said receptacles in cluding a belt movable in a curvilinear direction to tumble articles therein, ‘mechanism for pro 40 jecting abrasive at blasting velocity, means for moving said receptacles in said arc into and out of the path of abrasive projected at blasting velocity from said mechanism, and means to move said ‘belt to tumble articles within a re ceptacle when it is in the path of projected abrasive. relation and mounted to rotate on hollow shafts having a common axis of rotation, a plurality fof tumbling barrels mounted between said side wall members, said tumbling barrels being mov able with said side wall members to revolve said barrels in an arc about the axis of rotation of said shafts, an abrasive moving member mounted within said hollow shafts to carry abrasive from said casing,and asecond abrasive moving member positioned in the lower portion of said casing to 10 carry abrasive therefrom. 12. A tumbling mill comprising, a casing, a barrel supporting wheel within said casing having side wall discs spaced apart in parallel spaced relation and mounted to rotate on hollow shafts 15 having a common axis of rotation, a plurality of tumbling barrels having rotatable> end members mounted between said side wall discs, said tum bling barrels being movable with said side wall discs to revolve said barrels in an arc about the 20 axis of rotation of said shafts, and a screw con veyor mounted within said hollow shafts to carry abrasive from said casing. ' 13. A tumbling mill comprising, a casing, a barrel supporting'wheel within said casing having 25 side wall members spaced apart in parallel spaced relation and mounted to rotate on hollow shafts having a common axis of rotation, a plurality of tumbling barrels each having rotatable heads and' a curvilinear sidewall which constitutes a 30 part of a continuous belt mounted vbetween said side wall members, said tumbling barrels being movable with said side wall members to revolve said barrels in an arc about the axis of rotation of said shafts,l a screw conveyor mounted within said hollow shafts to vcarry abrasive from said casing, and a second screw conveyor positioned in the lower portion of said casing to carry abrasive therefrom. ` » ' 14. A tumbling mill which comprises, a casing, 40 means to project abrasive at blasting velocity into said casing, two side wall discs in parallel spaced relation mounted to form a wheel within said casing rotatable on a common axis, a hollow shaft to carry said wheel, a plurality of pairs of barrel 45 head members mounted between said side wall 9. Apparatus for blast cleaning metallic ar- ' discs, each pair of barrel head members being >ticles including, a frame rotatable on an axis, a rotatable on a common axis through their cen plurality of tumbling barrels mounted on said ters, a screw conveyor operable within said hol frame revoluble in an arc about the axis of rota low shaft to. remove abrasive from said casing, tion of said frame, each of said barrels including rotatable shafts carrying sprockets connecting 50 rotatable barrel heads and a b'elt movable in a said side wall discs, a conveyor belt trained over curvilinear direction about the periphery’of said said sprockets and rotatable barrel head mem barrelheads to tumble articles'therein, mecha bers to form a plurality of tumbling- barrels nism for projecting abrasive at blasting velocity, equally spaced apart and revoluble in an orbit . means for moving said barrels in said arc into'and about the axis of rotation of said wheel, means out of the path of abrasive projected 'at blasting to rotate said sprockets .thereby to cause said velocity from said mechanism, and means to move conveyor belt to move linearly, and means in said belt linearly when a receptacle is in the path .cluding a segment gear to rotate said wheel step oi projected abrasive. ‘ - 10. A tumbling mill comprising, a casing, a frame within said casing rotatable on an axis, a plurality of tumbling barrels mounted'on said es frame revoluble in an orbit about the axis'of ro tation of said frame, each of said barrels includ ing a pair of rotatable barrel heads and a movable belt trained over said barrel heads,y means for moving said barrels step by step in said orbit to . by step about said hollow shaft to bring each barrel successively into the path of projected abrasive. ' ~ (il) ' 15. A tumbling mill which comprises, means to projectv abrasive at blasting velocity, two side wall discs in parallel spaced relation mounted to 65 form a wheel rotatable on a common axis, a plu rality of pairs of vbarrel head members mounted between said side wall discs, each pair of barrel bring each barrel successively into abrasive clean head members being rotatable on a common axis 70 ing position, and means to move said belt linearly y through their centers, the axis of rotation of each whereby to cause articles in said barrel to be pair of barrel head members being the same dis 70 tumbled when in said blast cleaning position. 1l. A tumbling mill comprising, a casing, a bar rel supporting Wheel within said casing having side wall members spaced apart in parallel spaced tance radiallyv from the axis of rotation of said wheel and equidistant from each other, anv arcuate guide track mounted on said discs ad jacent each of said barrel head members, ro 75 n. . 2,181,732 tatabie shafts carrying sprockets connecting said side wall discs, a continuous conveyor belt trained over said sprockets and rotatable barrel head members and riding on said tracks thereby to form a plurality of tumbling barrels equally spaced apart and revoluble in an orbit about the 'axis oi! rotation of said wheel, means to rotate ' said sprockets thereby to cause said conveyor belt to move linearly, means to rotate said wheel step by step to bring each barrel successively into the path of projected abrasive, and means for returning projected abrasive to said abrasive projecting means. 16. A tumbling mill which comprises, means to 15 project abrasive at blasting velocity, two side wall 5. each pair of barrel head members being the same distance radially from the axis of rotation Aoi? rsaid wheel and equidistant from -each other, an arcuate guide track mounted on said discs ad jacent each of said barrel head members, a screw conveyor operable within said hollow shafts to carry abrasive therefrom, rotatable shafts carry ing sprockets connecting said side wall discs, a conveyor belt trained-over said ysprockets and rotatable barrel head members and riding on said 10 tracks thereby to form a plurality of tumbling barrels equally spaced apart andvrevoluble in an orbitabout the axis of rotation of said wheel, means to rotate said sprockets thereby’to cause said conveyor belt to move linearly, means to 15 a wheel rotatable on hollow shafts, a plurality of rotate said wheel step by step to bring each barrel successively into the path of projected abrasive, pairs of barrel head members mounted between said side wall discs, each pair of barrel head jectcd abrasive to said abrasive projecting means. discs >in parallel spaced relation 'mounted to form and a second screw conveyor for returning pro 20 members being rotatable on a common axis through their centers, the axis of rotation oi’ CHARLES H. HAMMELL.