US1570652A - Sand-ramming machine - Google Patents

Description

Jan. 26 192s.

J. 5. TOWNSEND SAND nmame momma Filed April 7; 1920 jYdWE', firzSfIhWsend M Patented Jan. 26, 1926.

, UNITED STATES 1,570,652 PATENT OFFICE.

JOHN S. TOWNSEND, OFHARVEY, ILLDTOIS, (ASSIGNOR T WHITING CORPORATION,

' OF HARVEY, ILLINOIS, A CORPORATION OF ILLINOIS.

SAND-RAMMING' MACHINE.

Application filed April 7,1921). Serial No. 371,799.

TOJLZZ. whom it mag concern Be it knownthat I, J oHN. S. Townsnnma citizen. of. the United- States, residing at Harvey, in the county of Cookand Stateof 6 Illinois,..have, invented a .certain new and useful Improvement in- Sand-Ramming Mae chines, of which the followingis ahspecification.r.-

-This invention relates .to mechanical mold- -ing machines, i. e., machines. for throwing sand.into-a mold about a pattern fromwhich a .casting. .is totbe made, and doing. this .so thoroughlyiand efficiently that hand tamping or. other manipulation of the mold is not lo -required. The object of this invention is to provide a..machine;for..taking sand from a stream flowing under. the actionof gravity, form it into wadsof sand suitable for molding 9' purposes .andprojecting said wads into the mold b0x,..or the like at a speed greater than that of gravity without the sand particles touching'any stationary surfaces, ie., anythingtendingto. retard or stop their motion. The invention consists. in a set of rotatable bladesso placed and arranged as to carry out theforegoing objects and to do this in a satisfactory and. eflicient manner, both as to the constructionandflthe operation .of the machine, and thev results produced. The inventionfurther consists in features and details of construction hereafter more fully set forth in the specification and claims.

.Referring to the drawings in which similar numerals represent the same parts thruout the several views, 1

Figure .l is a side view of mechanism illustrating this invention in its preferred form, certain parts being shown in section on line 11 of Figure2. Figure 2 is a plan view of the entire mechanism including the parts of Figure 1.

Figure 3 is a reduced size partially sectional view on the line 33, Figure 2. v In carrying out this invention two parallel shafts 10 and .12 are provided carrying intermeshing gears 14 and 16 so mounted.

within a case 18 that when power is applied to the extending end 20 of one ofthe shafts as 10, the two shafts are driven at equal speed in the opposite direction. The free ends of the shafts 10 and 12 which appear below the gears 14 and 16 in Figure 2 are carriedthru 7 and journaled -.in..the spaced apart parallel side walls'20 and22 offa rectangular casing whose ends are. 24... This casingis open top and bottom .so that sand delivered by. a chute 26 above its center can, except as hereafter noted, passfreely .thru

the-passage30 of the casing to. mold boxes (not shown) located below the passage 30. Onto/the portions of shafts 10 and 12which are inside the case are cylindrical drums or hubs 32 and 34 securedin placeby any suitablemeans, as for instance keys 36. On the 6b drum 32am one or more, in. the particular case here illustrated. two, projectingarms 40, preferably with circumferentially turned points 42 pointing in thefldirection ofrotation ofthedrum. To; each of these arms 40 is secured, if desired, a supplemental work ing. face 44 adapted. to be detachably secured in place by any suitable meansas for instance the bolts 46. The. function of this sup- 1 plemental member 44 is merely toprovide a removable working face for the arm 40 which can be changed as often as wear takes place. Each member 44 is providedwith a curve point 48 turned in the direction of mtation of the adjacent drum 32. .Except for this curved point 48 the sand engaging face ofeach member 44 is radial to the drum to which it is attached. :Because of this construction the fingers act positively on the sand they have to engage and speedup.

These members 40 and 44 have their points 42' and 48 at such distance from the central axis of the shaft 10 that as the shafts rotate these points will just clear the circumference ofthe adjacent drum 34. e

The opposite drum 34 is provided with projecting'arms or fingers 50 equipped with supplemental fingers 52 corresponding in construction .and function to the members 40 and 44 on the first mentioned drum- 32, the 95 only difference between the two devices being that, when parts are assembled, as shown in the drawing, the fingers on the opposite drums interfit with each other as rotation of the shafts 10 and 12 takes place.

The source ofpower applied to the end 20 of shaft 10 is such that the circumferentialspeed of the fingers 4044' and 50-52 is substantially greater than the velocity of sand falling from the hopper 20 under the 105 action of gravity and passing between the drums 32 and 34. The result of this construction is that as a finger on either drum passes the central vertical line between shaftslO and 12 it scoops out of the down 110 wardly flowing body of sand a quantity of moving sand, gathers ittogethe'r, anddri'ves it in a wad or gob downward to the mold box at a greater speed than the gravity flowing renewin it. The fin'gersi'on the opposite drums "are designed "to be "sufficicntly close together so that as they. low one after the other they successively gather up each successive portion of sand which is falling from the hopper 26. In other words there is no sand falling bygravity which gets thru the rotating fingers without being caught by them and having its speed accelerated.

Sand passing between the drums is retained against lateralescape and against retardation by striking against walls 20 and 22 by flanges or washers. 59 the ends of the drums rotating with them.

The result'of the construction shown and described is that any sand which one passing finger tends to direct laterally of the downward path of travel is in fact caught by the next finger on the opposite drum with the result that in practice the sand always travels, as desired, in wads delivered at high speed along the central vertical line between the .axes of the shafts lOand 12. y

The parts described, taken together, constitute a sandthrowing head, and are carried on an arm 60 mounted in any desired manner for movement about the foundry.

Having thus described my invention what I claim as new and desire to secure by Letters' Patent, is v.

1'. In mechanism of thec'lass described, in combination with a suitable passage, open at its top and bottom, and a chute for delivering sand at a iven speed, through said passage ,a; pair 0 rotatable drums in said passage on opposite sides of the path of travel of the sand through the passage intermejshing fingers on thedrums each'having a sand engaging face extending substantially radially from its adjacent drum adapted when the drums are rotated to collect quantitiesof sand from the stream of sand going thru the passage and means for rotating said drums at "a suiliciently high speed so that saidfingers travel faster than the sand moving thru said passage and successively collect portions of said sand, into wads and deliver it from the bottom of said, passage at a speed greater than the entering speed of the sand.

'2. In mechanism of the class described, a pair of rotatable drums placed parallel to each other and spaced apart from each other, intermeshing fingers on said drums each having a sand engaging face extending substantially radially from its adjacent drum, flanges or washers on the drums closing the openings attlie ends of the drums affording a verticalpassage from top tobottom thru and between said drums and said fingers, means supplying sand above said passage between the drains where it tends to fall between the drums, and means for rotating said drums and attachedtingersat a snfiici'entl high fispe'ed "so that the fingers on the drums gather sand falling between them into wads which are delivered at are celerat e d speed from the bottom of said passage,

3. In mechanism of the class described, in combination with asuitable passage, open at its top and bottom, and "chute for delivering sand at azgiven speed through said passage, a pair of rotatable drums infsaid passage on opposite sides of the path of travel ofthe sand through the passage in termeshing fingers extending radially from the circumferences of said drums, curved at their ends to point in 'th'edirection of rotation of the drums adapted when 'the'drums are rotated to collect quantities "of sand from thestream of sand goin'gxthr'u the passage and means for rotating saiddrums I at sufficiently high 'speedfljso that said; fingers travel faster than the sand moving. thru said passage and successivelycollect/portions of said sand into wadsand deliver it from the bottom 'ofsjai'dpass'age at "a speed greater thanthe entering speed of the sand.

a. In. mechanism of the, class described, a'pair of rotatable drumsplaced'parallel to each other and spaced ap'art'from each other, intermeshing fingers extending radially from 5. In mechanism of theclass described, in.

combination with a suitable passage, open at its top and. bottom, and 'a chute fondelivering sanda-t agiVenspeed through said passage, a pair of rotatable drums'insaid passage on opposite sides of the path of;

travel of the sand through the; passage intermeshing. readily detachable fingers extending radially from the circumferences of said drums, curved at their ends to point in the direction of rotation of. the drumsv adapted when the drums are rotated :lZQCOllect quantities of sand from the stream of sand going thru the pas'sagean-d means for rotating said drums at a sufliciently high speed so that said fingers travel faster than;

the sand moving thru said passage and the circumferences of said drums, curvediat.

successively collect portions of"- said sand into wads and deliver it from the bottom of said passage at a speed greater than the entering speed of the sand.

6. In mechanism of the class described, a pair of rotatable drums placed parallel to each other and spaced apart from each other, intermeshing readily detachable fingers extending radially from the circumferences of said drums, curved at their ends to point in the direction of rotation of said drums, flanges or Washers on the drums closing the openings at the ends of the drums afl'ording a vertical passage from top to bottom thru and between said drums and said fingers, means supplying sand above said passage between the drums where it tends to fall between the drums, and means for rotating said drums and attached fingers at a sufliciently high speed so that the fingers on the drums'gather sand falling between them into wads which are delivered at accelerated speed from the bottom of said passage.

In witness whereof, I have hereunto subscribed my name.

JOHN S. TOWNSEND.

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