US1872178A - Sand blast machine - Google Patents

Description

3 Sheets-Sheet l Aug. 16, 1932.` L.. D. PElK SAND BLAST 'MACHINE Filed May 26, 1930 3 Sheets-Sheet 2 Aug. 16, 1932. D. PEIK SAND BLAST MACHINE Filed may 26, 1930 5 Sheets-Sheet 5 Patented Aug. 16, 1932 UNITED STATES LOUIS D. PEIK, F MISHAWAKA, INDIANA SAND BLAST MACHINE Application med May 26, 1930. serial N. 455,674.

In sand blast machines, sometimes called tumbling mills for sand blasting, polishing and the like, various devices such as rotatable cylinders and endless belt mechanisms have heretofore been devised for tumbling or cataracting castings or other articles to be acted upon by the sand or other abrading or polishing materials.

In the'development of the sand blast machine for polishing and cleaning various articles such as metallic castings, a tumbling barrel capable of being closed, but with a removable door or closure member for loading and unloading has been used. Such machines l5 have required the stoppage of the tumbling and sanding apparatus in loading and unloading, With the result that they have not proven highly efficient from the standpoint of expenditure of time and labor. Greater etliciency is attained in the use of the type of machine disclosed in my prior U. S. Patent No. 1,567,077 of December 29, 1925 in which the cataracting of the materials being sanded or polished by exposing them to the action of sand blast devices is attained by means of an endless belt device capableof being oscillated or shifted from the normal Working position where the materials may be cataracted while exposed to the sand blast and afterwards automatically unloaded by a reversal of endless belt cataracting mechanism to a load receiving position Where a new load of material is delivered to the apparatus. While the device of .my aforesaid patent attains results in efficiency of both time and operating expense and provides complete automatic means for loading and unloading, there is still the inevitable loss of time in the sand blasting operation which results during the loading and unloading periods. Furthermore, in that type of machine during the time that the Work is being turned over and over in order tov operate economically, there must be a consideraole load of materials in the sanding device and although the load will be turned over and over, in order that allv surfaces may be properly exposed to the blast, both the barrel and the endless belt type of tumbling mechanism is open to the objection that the material is not divided in suiiciently small amounts when the device is economically operated.

Furthermore, in a tumbling device Where a maximum amount of materials or load is handled during a single tumbling and sand blasting operation there is greater liability of breakage, especially Where castings or pieces of a frail nature are being blasted or polished than Where the materials being acted upon are tumbled in relatively smaller quantities in passing through the machine.

lt is the primary object of the present invention to generally improve the construction and mode of operation of sand blasting, tumbling or polishing machines in order to make the device practically continuous in operation, thus dispensing With practically all down time in the cycle of operation of the machine by making the operations of loading, sanding and polishing, and unloading '70 continuous.

It is afurther object of the invention to provide improved mechanism in a machine of the described character whereby materials as castings and other metal parts being acted upon by the sand blast in sanding and polishing may pass through the machine in a continuous stream or succession of movements and particularly in relatively small quanti' ties, thus obviating breakage and also securing greater certainty of the various pieces of the materials being acted upon to be turned over and properly submitted to the action of the sand blast or other abrading or polishing material. 95

It is a further object of the invention to provide improved mechanism in a sand blasting or polishing machine in order that the sand blast guns or nozzles may be arranged to act upon the materials to be cleaned and polished throughout any desirable range.

A still further object of the invention is to provide improved mechanism for conveying the materials or objects to be polished and blasted through the range Where they are acted upon by the sand blast guns with a degree of movement that is slightly intermittent so that during some of the periods of blasting the materials being acted upon will loo be substantially at rest, permitting the surfaces thereof to be cleaned, especially thoroughl and while the materials are being mov `or rolled over by intermittent movements, the cores or recesses of the articles or castings which may contain core sand and abrasive will be tumbled.

It is a further object of the invention to provide improved means for conveying articles to be sand blasted or polished throughout the range of sand blast guns by intermittent movements of a character that will move the materials being acted upon and tumble them from one position to another without dropping them a suliciently great distance or in a manner that might result in breakage of frail ieces.

It is a further object of the invention to provide a machine of the desired character that shall be simple in construction and economical to manufacture and in which the moving parts have comparatively litt-le relative wearing action against each other, thus insuring long life to the moving parts, which of necessity must be subjected to an extent at least to the wearing or abrading action of the sand blast.

It is a further object of the invention to provide simple and ecient means for submitting articles to be sanded, blasted' or polished to the action of sand blast guns, the operating bearings of which are so arranged that they may be readily tightly sealed to substantially exclude dust or abrasive and may also advantageously permit the use of antifriction bearings of the most modern and approved types by reason of such-construction, thus rendermg the improved machine capable of operation with a minimum expenditure of power.

Other objects of the invention will appear from the following description which is directed to the preferred embodiment as depicted in the drawings forming a part of the specification, thelnovel features of the inventlon being set forth in the appended claims.

In the said drawings:

Figfl is a front elevational view of my improved machine with parts of the cover and frame work removed or broken away and other parts in` section.

Fig. 2 is a vertical sectional view through the machine taken approximately on the line 2 2 of Fig. l, looking in the direction indicated by the arrows.

Fig. 3 is a broken sectional view taken approximately on the line 3-3 of Fig. 2, looking in the direction indicated by the a1?- rows, illustrating details of construction of the sand blast nozzle shifting mechanism.

Fig. 4 is a broken sectional View similar to Fig. 3 taken on the line 4 4 of Fig. 2, looking in the direction indicated by the arrows;

5 is a detail view illustrating the connectlons for controlling the movements of the/sand blast nozzles or guns, being taken line 6-6 of Fig. 1, looking in the direction 4 indicated by the arrows.

One of the chief novel characteristics of the invention resides -in the dispensing of the rotary or oscillating barrel or tumbling container of the prior art or the endless belt mechanisms that have been commonly employed in retaining the castings or materials while being sand blasted orpolished during which time, as well known in this art, they must be submitted to the action of abrading or polishing material coming from the san blast guns and kept in motion for the purpose of presenting -all of the surfaces thereof to the abrading and polishing action of the blast.

In the embodiment of the inventlon as shown in the drawings and particularly with reference to Fig. 2 thereof, I provide a series of oscillating receptacles orbuckets, five in number, and designated by the reference characters 10 to 14 inclusive. These oscillatingreceptacles have a pan-like or trou h form and are arranged as illustrated in ig. 2 in a substantially vertical column so that materials to be sanded and polished or abraded may be fed in a substantially continuous manner into the uppermost receptacle of the series and there oscillated or turned and finally dumped and allowed to fall by gravity into the next succeeding receptacle or bucket of the series, at the same time being acted upon by the sand blast guns during substantially the entire time that the materials are passing through the receptacles or buckets from the top to the bottom of 'the column.

Any desired or eilicient loading means may be employed for conveying castings or other materials to the machine to be blasted and polished. In the present embodiment I show for delivering castings to the receptacle 10 an endless belt type of conveyor supported at its delivery end by a rotary shaft 15 carrying suitable s rocket wheels 16, one of which is shown in ig. 2, for driving anv endless belt or link type of conveyor which will be caused to travel in the direction indicated by the ar- `mounting the series of receptacles or buckets 1Q to 14 inclusive for loscillatory movements, w1ll be supported by suitable frame Work, as

for example, the spaced apart and substantially parallel vertical side frame members 19 and 20, see Fig. 1. It will be understood that the frame members 19l and 20 will be suitablyv supported to retain and support the moving` parts of the machine and theioscillatory receptacles 10 to 14 inclusive will for sanitary and protective reasons be enclosed so that the sand guns will discharge into the enclosure, the general form of which may be as illustrated in the `sectional view shown in Fig. 2.

There will obviously be an opening for the gears 16 of the feed conveyor device in the side wall of the machine closure or casing near the top thereof, as shown in Fig. 2. The walls of the closure, which may be ormed of sheet metal, or other suitable material, are designated generally by the reference character 21 in the sectional v iew in Fig. 2. Parts of the walls of the closure adjacent those portions where the nozzles of the sand guns enter may be closed by flexible curtains in the usual manner and for purposes of inspection, parts of the closure or exible curtains may be made of transparent material if desired. The casing 21 will terminate at the bottom in a substantially V-shaped trough portion as indicated by the reference character 22 forthe purpose of providing a sand collecting trough to be hereinafter more specifically described. i

The oscillatory receptacles or buckets 10 to 14 inclusive which hold and transmit the articles being blasted andI polished while being worked upon during their passage through the machine should preferably be of a very substantial character or construction. I prefer that they be made of integral castings of steel o1' other suitable materials of a character adapted to support and oarr the castings or other materials being blaste and polished and having the quality of resisting the action of the abrasive used. Itis in fact one of the important features of my invention that the oscillator receptacles or buck-v ets may be constructe in the form of substantial hard steel castings, thus insuring that they will have comparatively long life in the operation of the machine. They will preferably be constructed in the form of open top troughs or basins as shown most clearly by the sectional views in Fig. 2, and it is one of the novel features of my invention that these receptacles, regardless of the number' used in the series, may be so designed that each alternate receptacle or'bucket will be a duplicate of the other. For example, receptacles 10, 12 and 14 will be alike in their design and construction, and the same will be true of the second and fourth rece tacles in the series designated by there erence characters 11 and 13. Both types of receptacles are substantially alike in the general form of the construction, being of trough shape, the material being referably somewhat thinned down at the e ges and the ends of the troughs closed, thus making open top receptacles out of them. For example, receptacles 10, 12 and 14 will have at each end closure -members as indicated by reference character 23 and the receptacles 11 and 13 will have their respective ends closed by similar closure members 24. All of the receptacles 10 to 14 inclusive of the series are designed to have oscillatory movements in relation to the supporting side members 19 and 20 of the machine, there being suitable bearings supported by the side members for thisl purpose and trunnions formed on the outer walls of theend members 28 of receptacles 10, 12 and 14. The closure members 23 will be substantially semi-circular in forni', their outer peripherles, of course, extending down to where the material joins the ends of the receptacle bodies 10, 12 and 14 and the aforesaid supporting trunnions designated by the reference character 25 will be formed at substantially the geometrical center of these semi-circular end portions.

The alternate receptacles 11 and 13 will have plain types of en d closure members 24 without the trunnions and the trunnions for these receptacles, as indicated at 26, will be cast integral with the walls of these receptacles at one edge of their trough-like bodies and on opposite ends thereof, as illustrated in Fig. 2, so that when both the series of receptacles or buckets are oscillated in the manner to be presently described, they will have movements obviously of different characteristics on their respective supporting trunnions. While any desired number of receptacles or buckets'may be employed within obvious limits, a series comprising five buckets arranged as shown in Fig. 2 has been found by me to give satisfactory results, and I connect alternate receptacles 10, 12 and 14 together so that they will have synchronous operation and likewise I connect the alternate receptacles 11 and 13 together also to have synchronous operation in a definite relation to the other synchronously operated buckets of the series. This is accomplished by means of suit-able arms or levers secured to the trunnions 25 and 26. Reference characters'27, 28 and 29 designate the operating arms on buckets 10, 12 and 14, respectivel and 30 and 31 indicate the arms on the bue ets 11 and 13, respectively.

The arms 27, 28 and 29 are interconnected by means of links 32, 33 and the arms 30 and 31 are interconnected by the link 34, all of which links have pivotal connections with said arms. Pivotally connected with the arms 29 and 31 of each series of receptacles or buckets are piston rods 35 and 36. The pistbn rods 35 and36 are reciproat 39, and with vthe frame of the machine near the bottom thereof, as illustrated in Fig. 2.

The cylinders 37 and 38 will carry suitable.

pistons connected to the aforesaid piston rods so that when suitable fluid pressure as steam, or preferably air, is introduced into the tops and bottoms of these cylinders above and below the pistons, the receptacles Aor buckets 10, 12 and 14 ma be oscillated by the respective oscillations o said pistons. In the drawings I show the air lines 41 to 44 inclusive for introducing and venting air pressure in the respective ends of these cylinders 37, 38. These lines lead to a central point of control which is designated diagrammatically and generally in Fig. 2 by reference character A. The control of the operating iiuid pressures to the cylinders 37 and 38 as well as to the cylinders 60 and 65, which operate the sand blast guns as hereinafter described, will preferably be under the control of a suitable valve mechanism operated by a program electrical timing device with which all of the air supply and exhaust linescommunicate as in the vicinity of the part diagrammatically indicated and designated by reference character A, the details of which are not shown, since the same forms no part of the presentinvention and since such valve mechanism and program electrical timing devices are well known and easily obtainable on the market.

It will be seen that the dumping positions of the first, third and fifth receptacles of the series, designated by reference characters 10,

' 12 and 14, are correctly represented by the dotted line positions in Fig. 2, while the load receiving positions ofthe second and fourth receptacles, designated as 11 and' 13, are correctly represented by the dotted line positions of these parts shown in the same figure.

The mode of operation of the receptacles of the series will be apparent from an inspection of the relative positions of these parts, as

shown in Fig. 2. The body portions ofthe receptacles or buckets- 10 to 14 inclusive are shown of solid construction in the drawings. When this constuetion is used the abrasive discharged from the guns upon the pieces being abraded and polished will accumulate in the various receptacles to an extent, but, of

course, will be dumped and passed downwardly through the series according to the mode of operation of the receptacles. Under some conditions and in the handling of some classes of work it may be found expedient to provide the receptacles or buckets 10 to 14 inclusive with perforations or slots, not shown, that will permit substantially all of the abrasive to sift downwardly and pass through the receptacles, these openings, of course, not be'- ing sufliciently large to permit the escape of any of the articles being sanded or polished. Therefore, with a load of materials inthe receptacles 10, 12 and 14 positioned as shown,

in full lines in Fig; 2, through airlines 41, 42 pressure will be admitted vabove the pistons in both cylinders 37 and 38 and both pistons will travel downwardly, and the receptacles 10, 12 and 14 will alternately be brought to the vertical dotted line positions as shown in Fig. 2, where the materials being treated by.

45, the upper run of which travels horizon-V tally in a direction out of the casing of the machine, this discharge belt being operated by suitable sprockets, as indicated at '46, ona

suitable power operated shaft 47, journalled in the machine frame.

The pipe lines 43, 44 from the timing and control mechanism A will admit air pressure below the pistons in the cylinders 37 and 38, causing them in the proper sequence to be returned to the dotted line position as shown in Fig. 2, which will put the receptacle 10 in condition to receive articles to be treated from the conveyor devices 18, and' the receptacles 11 and 13, respectively, in condition to discharge their loads into the receptacles 12 and 14, respectively.

One of the important'features of the invention resides in the construction and mode of operation of the mechanism controlling the operation of the sand blast gun devices. The oscillatory receptacles or buckets 10 to 14 inclusive provide novel means of presenting the work to be abraded or polished to the action of the abrading material, and in order that the blasting action may be most ters 52 and 53. Both pairs of nozzles are.

spaced apart so that the intervening distance between the respective nozzles in each pair is approximately one-half the distance .between the side frames 19 and 20 of the machine and the length of the oscillatory receptacles or buckets 10 to 14 inclusive. The nozzles of each pair are connected together to have synchronous movement as a pair or group Aand the movements provided are of two characters. They ,should osciltrol mechanism A. 63 (Fig. 4

late horizontally from side to side over the receptacles or buckets 10 to 14 inclusive and they should also have an oscillating movement in the manner depicted in the detail sectional view Fig. 5, from which it will be seen that the jets of abrading material from the nozzles 50 and 51 will be caused to cover substantially the entire length of the receptacles or buckets 10, 11, 12 and 13, oscillating at the same time on a horizontal axis to discharge from a substantially horizontal position to almost a vertical position or through an angle of a little less than ninety degrees, as illustrated in Figsp2 and 5.

In the same manner it will be seen that the oscillation of the air of nozzles 52 and 53 will cause them to Ibe effective in delivering the abrading material to the receptacles 13 and 14 and upon the materials while they are being discharged from receptacle 12 into receptacle 13, this pair of nozzles also being given a horizontal reciprocator movement.

60 is a cylinder having air in et openings, pipe connected with the air sup ly and conlJ1s a piston rod connected to a iston on the interior of the cylinder 60 andp connected to the piston rod 63 is a bracket 64, u on which is mounted an air cylinder 65 ig. 6). The piston rod 63 carries two parallel members 66, 67 spaced apart and terminating in sleeves adapted to surround header pipes 68 and 69, respectively. The header' pi es 68 and 69 have attached near the en s thereof the spaced apart vsand blast nozzles 50, 51 and 52, 53, respectively, in the manner illustrated in Flgs. 1, 2, 3 and 5.

The blast nozzle heads 68, 69 are connected-by the feed lines 70, 71 (Fig. 1) that communicate with the header pipe 72 leading to a mixing device, the control valve of which is shown at 73 in Fig. 1, and in which air is introduced from the tank 74 and sand from the sand reservoir 75 in a manner well known and forming no part of the present invention, but it will be understood that a blast of air carrying the abrasive materials such as sand will pass under pressure through the feed lines 70, 71 into the man1- fold or header pipes 68, 69 and the sand will pass thence under pressure through the discharge nozzles 50, 51 and 52, 53, respectively.V The cylinder 65 is connected at its ends with two flexible tubes 80. 81 with the air pressure lines leading to the control mech-- anism A.

The function of the motor cylinder 65 1s to oscillate the nozzles in a circular path in verticle planes to cause them to spray or direct the discharge of sand or other abrading material over the articles being blasted or sanded in the receptacles 10 to 14 inclusive. This is accomplished by a connection bebetween the nozzles comprising the arms 83,' 84 and the connecting link 85, 86

is a short arm connected with the nozzle header 68 and preferably connected with piston rod 87 in cylinder 65 through a link pivotal connection 88. Therefore, as pressure is admitted and exhausted from the respective ends of the cylinder 65 the two pairs of sand blast nozzles 50, 51 and 52, 53, respectively, will be oscillated in vertical planes through approximately ninety degrees of movement to cover every desired portion of the adjacent receptacles 10 to 14 inslusive. At the same time these sand blast nozzles may be oscillated from side to side of the machine throughout the length of these receptacles by means of suitable control pressure admitted through the pipe lines 61, 62 leading to the valve control mechanism A from the cylinder 60, which is provided with a. piston, not shown, connected to the piston rod 63 and carrying bracket 64 which supports cylinder 65. Thus when the piston in cylinder 60 is operated to reciprocate the rod 63 the cylinder 65 andthe respective headers 68, 69 will be reciprocated horizontally from side to side between the side frame members 19 and 20 so that the sand blast nozzles will be caused lto traverse substantially the entire length of the article carrying receptacles 10 to 14 inclusive. In Fig. 1 the dotted line positions of the sand blast nozzle mechanism indicates the degree of reciprocatory horizontal movement that may be imparted in this manner to the nozzles while the degree of oscillatory movement in vertical planes of the nozzles is best illustrated by the respective full and dotted line positions in Fig. 5 and also in Fig. 2.

Therefore, it will be seen thatl as the articles are being delivered and passed through the oscillating receptacles. 10 to 14 inclusive they will be acted upon by the sand blast nozzles which will oscillate in an angular direction through an angle of a little less than ninety degrees, causing the upper pair of nozzles to blast the abrasive material upon the upper three or four receptacles in the series, while the lower pair of nozzles will traverse the zone of travel of the materials through the three lower receptacles or buckets in the series. At the same time it will be apparent that when the air pressure is alternately caused to enter the branch lines 61, 62 into the respective extremities of the cylinder 60, the piston rod 63 carrying the sand blast nozzle operating devices may be controlled as desired and the piston rod 63 caused to travel back and forth, as desired, and carry the sand blast nozzle operating devices from side to side between the side supports 19 and 20 of the main frame, thus causing the sand blast nozzles 50, 51.and,52, 53 to traverse substantially every part of the receptacles or buckets 10 to 14 inclusive, not only from end to end thereof but from the top to thebottom as the materials are being transported therein from the time that they are delivered to the uppermost receptacle' 10 until they are discharged in an abraded and polished condition upon the endless belt discharging device 45.

It will be apparent that in the above described mechanism with particular reference to the receptacles or buckets 10 to 14 inclusive a'nd their lcontrolling mechanism, and in the co-operating mechanism for controlling the sand blast nozzles I have provided mechanism under the control of an operator that is ca able of submitting castings of the most de icate character to the most eicient action of sand blast mechanism without danger of injury toeven the -most delicate castings, and that the receptacles for presenting the materials to the sand blast devices are of a sturdy and substantial character, enabling the important moving parts thereof to be remote from any injurlous connections with the sand blast devices and being of a nature that permits them to be formed of highly resisting material of a relatively cheap character that may be readily replaced at a low cost, thus not only rendering the machine highly eficient in operation but reducing the cost of upkeep and replacement and by reason of the simplicity, particularly of the work present- .ing apparatus, affording a type of machine v of this character that may be operated with a minimum amount of down time.

It is an important feature of my invention that the co-operating oscillating receptacles 11 to 14 inclusive in connection with the sand blast nozzles are under the control of mechanism that may have its degree of timing varied at the will of an operator so that the blast may be directed upon the articles being treated in the receptacles as long as may be desired and at the same time making it possible for the operator through suitable operation of the control mechanism to quickly restore the blast nozzles and the receptacles 10 to 14 inclusive to operative positions after a discharge of sanded materials from the lowermost receptacle 14 upon the delivery conveyor 45, thus greatly tending to increase the .effectiveness and elciency of the machine,

which, it will be seen is continuous in its operation and avoiding all. loss due to down time in loading and discharging.

100 is a motor connected to operate a sand elevating device 101 in the form of an end-v less belt carrying a plurality of buckets discharging in some suitable manner not shown into the sand reservoir 7 5. The sand from the sand blast nozzles will fall downwardly in the bottom of the machine into a suitable collecting pan or trough where it may be acted upon by a rotary screw conveyor 105 and carried-to the vicinity of the lower end of the elevator belt 101. The means for supl plyin the sand and air under pressure to the sand last nozzles and the means for recov art.

`For protective purposes the casin of the machine may be made substantial dust.

tight and this'eifect may be enhanced y providing a floating drop curtain of cloth or other suitable flexible material as designated by reference character 110, Fig. 2, for cooperating with the upper run of the delivery conveyer 45. I prefer also to provide suitable means for discharging fine particles of sand and dust that may be produced in the operation of the machine and this may be accomplished by alsuitable suction pipe designated by reference character 112 secured to the casing 21 of the machine adjacent a perforation 113 therein.

In the drawings, Fig. 2, the reference character 114 designates a plate that extends from side to side on the interior of the casing adjacent the receiving end of the delivery conveyor 45, being designed to prevent any dislodged articles from being carried between the conveyor 45 on sprocket 42 and the wall 22 of the casing. Near the delivery end of the feed conveyor I also prefer to provide a plate 115 designed to prevent any .dislodged articles from. falling downwardly yinto the casing between the sanding receptacles and the wall of the casing.

What I claim as my invention and desire to secure by Letters Patent is:

1. A. sand'blast machine comprising a, plurality of containers tiltably mounted upon spaced apart substantially parallel axes ar and a sand blast gun adapted to discharge polishing material upon articles being passed through said containers. s

2. A sand'blast machinecomprising a plurality of tiltably mounted containers arranged in series, means for operatively connecting alternate containers of the series in two4 separately controllable groups for causing articles to be sand blasted to move successively through said tiltable containers, and a sand blast gun adapted iso-discharge polishing material upon articles being passed through vsaid tiltable containers.

3. A sand blastv machine comprising a plurality of open top tiltable containers arranged in series, means for causing articles to .be sand blasted to move successively through said open top tiltable containers, and a sand blast gun adapted to discharge polishing material upon articles being passed through said open top tiltable containers.

4. A sand blastmachine comprising a plurality of open top tiltable containers arranged in series 1n substantially vertical alignment, means for causing articles to be sand blasted to move successively through said open top tiltable containers, and a sand blast gun adapted to discharge polishing material upon articles being passed through said open top tiltable containers.

5. A sand blast machine comprising a plurality of open top tiltable containers arranged in series in substantially vertical alignment, means for tilting said containers in sequence for causin articles to be sand blasted to move successive y through said containers from the topmost to the lowermost container in said series, and a sand blast gun adapted to discharge polishing material upon articles being passed through said containers.

6. A sand blast machine comprising a plurality of open top tiltable containers arranged in series in substantially vertical alignment, means for tilting said containers in predetermined sequence for causing articles to be sand blasted to move successively through said containers from the to most to the lowermost container in said series, and a sand blast gun adapted to discharge polishing material upon articles being passed through said containers.

7. A sand blast machine comprising a plurality of tiltable containers arranged in substantially vertical series, means for tilting said containers in predetermined sequence for causing articles to be sand blasted to move successively'through said containers, a sand blast gun adapted to discharge polishing material upon articles being passed through said containers, and means for delivering articles to besand blasted to the topmost container of said series.

, 8. A sand blast machine comprising a plurality of tiltable containers arranged in substantially vertical series, means for tilting said containers in predetermined sequence for causing articles to be sand blasted to move successively through said containers, a sand blast gun adapted to discharge polishing material upon articles being passed through said containers, means for delivering articles to be sand blasted to the topmost container of said series, and means for receiving and conveying articles discharged from 'the lowermost container of said series.

9. A sand blast machine com rising a plurality of comparatively sha1 ow open topped tiltable containers arranged in series in substantially vertical alignment, means for connecting each alternate container of said series into two distinct groups, Ameans for alternately tilting each of said groups of containers according to a predetermined sequence of movement for causing articles to be sand blasted to move successively through' each of said containers from the to most to the lowermost container in the said series, and a sand blast gun adapted'to discharge polishing material upon articles being passed through said series of containers.

10. A sand blast machine comprising a plurality of comparatively shallow open topped tiltable containers arranged in series in substantially vertical alignment, means for connecting Aeach alternate container in said series into two distinct groups, means for alternately tilting each of said groups of containers according to a predetermined sequence of movement for causing articles to be sand blasted to move successively through each of said containers from the topmost to the lowermost container in the series, and sand blast mechanism comprising a plurality of pivotally mounted sand guns adapted to discharge polishing materialsheld within and upon articles while bein being assed through said containers.

` 11. sand blast machine comprising a plurality of pivotally mounted open topped containers arranged in series, so that each container upon beingtilted may discharge into the'adjacent container beneath it, means for operatively connecting the alternate con- 'tainers in said series into two distinct and separably o erated groups, and a sand blast gun adapte to discharge polishing materials upon articles being passed through said series of containers.

12. A sand blast machine comprising a plurality of pivotally mounted open topped containers arranged in series so that each container upon being tilted may discharge into the adjacent container beneath it, means with the alternate containers of the series.

interconnected into two distinct groups whereby the containers of each group may be synchronously operated to discharge the contents therein toward the open top of the respective containers below in the said series, a sand blast gun adapted to discharge polishing material upon articles being passed through vsaid containers, means for conveying articles to be sand blasted to the 'topmost container of the series, and means for receiving articles discharged from the lowermost-container of the series and for conveying said articles from said sand blast machine.

14. A sand blast machine comprising a plurality of open topped tiltable containers arranged in series in substantially vertical alignment, means for oscillating said o ontainers for causing articles -to be sand blasted to move successively from `the top to the.

bottom of the series, and sand blast mechanism for discharging polishing material upon articles being passed through said containers comprising a pivotally mounted sand blast gun, and means for oscillating the latter to vary the point of the .impact of the polishing material upon the articles being passed through said containers.

15. A sand blast machine comprising a plurality of integral cast metal trough-'like structures each rovided with trunnlons at the ends thereo the said containers being divided into two distinct groups, in one group of which the said end trunnions thereof are arranged substantially centrally of the end portions thereof and the other group having the respective trunnions at the ends thereof arranged adjacent the circumferential end portions of the containers, each of said groups of containers being alternately arranged with respect to the individual containersof the other of said group, the containers of each group being interconnected to havesynchronous oscillation whereupon being operated by groups articles discharged into the uppermost container of the series will pass successively through the containers to the bottom of the series, and sand blast mechanism for discharging polishing material upon articles while passlng through said containers.

16. A sand blast machine comprising a plurality of tiltable containers arranged in series, means for oscillating said tiltable containers for causing articles to be sand blasted to move successively through the series, Asand blast mechanism adapted to discharge polishing material upon articles being passed through said containers, and means for imparting oscillatory movements to said sand blast mechanism in two different directions whereby to discharge polishing material substantially from side to side of said series of containers and over a.plurality of the interiors of said tiltable containers. 4

17. A sand blast machine comprising a plurality of open topped tiltable containers pivotally mounted in series in substantially vertical alignment, interconnectin means arranged between alternate containers of said series whereby said containers are divided into two distinct groups, whereby they may be separately oscillated by groups for discharging articles successively from the topmost to the lowermost container of said series, a sand blast device comprising a plurality of spaced apart sandblast` guns each mounted to haw, vibratory movements on horizontal axes, and independent horizontal oscillatory movements from side to side of the said series of containers whereby to discharge polishing material into substantially everypart ofthe interiors of said containers, means for forcibly discharging polishing material through vspectlve oscillatory and v1 said guns, and means for applying said reratory movements to said sand blast guns.

18. A sand blast machine comprising a plurality of ytiltably movable containers arranged in series adapted to receive articles to be sand blasted and to convey said articles through a part of the machine whereby said articles may be presented to the abrading and polishing action of the sand blast guns, a plurality of spaced apart oscillatory sand blast guns, fluid pressureoperated devices for tiltably operatmg said containers to move articles to be sand blasted through said machine ast the discharge nozzles of the said oscillatin sand blast guns,.and iluid 'pressure operate devices for oscillating said sand blast uns. g 19. A sand blast machine comprising a plurality of open topped tiltable containers arranged in series in a substantially vertical column, means for conveying articles to be sand blasted to the topmost container of said series, means for conveying articles discharged from the lowermost container of said series, and a fluid pressure operated sand blast device comprising a plurality of spaced apart sand blast guns mounted to oscillate in both horizontal and vertical planes and to discharge .polishing material into said tiltable containers.

In testimony whereof I have signed my name to this specification, on this 22 day of LOUIS' D. Pam.

may A. 1930.

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