US2177614A - Sand mixing and sifting machine - Google Patents

Description

w Oct. 24, 1939. E. H. TRICK SAND MIXING AND SIFTING MACHINE Filed Jan. 9, 1939 4 Sheets-Sheet l MN m NN NM i i I 551i. Trick Oct. 24, 1939. E. H. TRICK SAND MIXING AND SIFTING MACHINE Filed Jan. 9, 1939 4 Sheets-Sheet 2 Oct. 24, 1939. E. H. TRICK 2,177,614

SAND MIXING AND SIFTING MACHINE Filed Jan. 9, 1939 4 Sheets-Sheet 3 Oct. 24, 1939. E. H. TRICK SAND MIXING AND SIFTING MACHINE Filed Jan. 9, 1939 4 Sheets-Sheet 4 .5 Trick:

Patented Oct. 24, 1939 UNITED STATES PATENT GFFICE 7 Claims.

in; by the core maker.

Another object of the invention is to provide a machine of this character including a cylindrical screen having therein a mixing trough through which extends a shaft carrying paddles orblades, the trough being so mounted that it may be shifted from an upright position for filling to an inverted positionfor dumping the mixed sand into the screen and the screen being formed in sections in order that it may be opened for 2w filling the trough and for dumping waste material from the screen.

Another object of the invention is to provide a machine of this character wherein the shaft and the mixing paddles may continuously rotate and s the cylindrical screen only have rotary motion imparted to it when the trough is turned to an inverted position for dumping contents of the trough into the screen, rotation of the screen being stopped when the trough is returned to its initial position for filling.

Another object of the invention is to somount the trough and the shaft carrying the mixing blades that a handle may be employed for turning the trough'to its inverted or dumping position,

means being provided for limiting movement of the handle during the turning operation to in sure proper movements being imparted to the trough and this means also constituting means for exerting cam action upon the handle and causing 33 the trough and the shaft to be shifted longitudinally to move a clutch carried by the shaft into or out of engagement with a companion clutch member carried by the cylindrical screen at one end thereof.

It is another object of the invention to provide the mixing and sifting machine with a base constituting a box to receive the mixed and screened material and having a front wall so mounted that it may be swung downwardly to a lowered position fiat upon the workbench and thus allow the workmen to easily remove the mixture when using the same to form a core.

The invention is illustrated in the accompanying drawings, wherein:

' Figure 1 is a View showing the improved mixing and sifting machine in front elevation with the front wall of its base in a lowered position,

Figure 2 is a vertical sectional view taken longitudinally through the improved machine,

Figure 3 is a View taken along the line 3-3 of Figure 2 and showing the machine partially in vertical section and partially in end elevation,

Figure 4 is a top plan view of a bearing forming part of the invention, the view being taken along the line 4-4 of Figure 2,

Figure 5 is a vertical sectional view taken transversely through the machine along the line 55 of Figure 2 with the front wall of the base in its raised position, and

Figure 6 is a view similar to Figure 5 showing the trough in the inverted position and the front wall of the base lowered.

This improved mixing and sifting machine has a box-like base which is to rest upon the workbench of a core maker and has a bottom I, end walls or standards 2 and 3, a rear wall 4 and a front wall 5 which is mounted for swinging movement from the raised position shown in Figure 5 to the lowered position of Figure 6 by hinges 6 and carries eyes i for engagement by the hook 8 to releasably hold the front wall in the raised position. The end walls are reinforced by vertically extending webs 9, and along their upper edges by outstanding marginal webs or flanges Ill to prevent bending of the walls which are subjected to the weight of other mechanism carried thereby. A bar ll extends between rear ends of the bars or flanges iii to reinforce the rear wall 4 which has its upper end secured against the under face of the bar I l by a suitable number of rivets or equivalent fasteners 12.

Between the end walls of the box-like base is disposed a cylindrical screen l3 having solid heads l4 and foraminous walls which consist of companion sections [5 and iii, the section l5 being permanently secured along its end to the head l4 and the section I 6 being hingedly mounted, as shown at IT, in order that it may be swung from the closed position where it is secured by the fasteners 18 to the raised or opened position, indicated by dotted lines in Figure 3. Trunnions or stub shafts l9 and 29 extend from the opposite ends or heads M of the cylindrical screen and are engaged through bearings 2i and 22 to rotatably mount the screen. A mixing trough 23 which is of less length than the cylindrical screen is housed within the screen, and this trough carries stub shafts 24 and 25 which are rotatably received in the stud shafts l9 and 0 Of the screen. It should be noted that the stub shaft 24 extends partially through the stub shaft I3, whereas the shaft 25 extends entirely through the shaft 20 and adjacent its outer end carries a radially extending handle 26 formed of a strong metal bar and projecting outwardly through a slot 2'! which extends circumferentially of the bearing 22 and spirally thereof. This slot guides and limits movement of the handle, and from an inspection of Figure 1, it will be readily seen that by grasping the handle, turning movement for one-half a revolution may be imparted to the shaft 25 and the trough 23 turned from the upright position of Figure 5 to the inverted position of Figure 6 but not beyond the position shown in Figure 6. A stop 28 is provided at the lower end of the slot 21 for engagement by the handle to limit turning movement of the handle when movement of the handle is brought to a stop. In order to normally hold the handle at the upper end of the slot with the trough in the upright position for a filling and mixing operation, there has been provided a latch 29 pivoted to the bearing 22 and having a bill 30 formed with a sloping cam surface 3i so that, when the handle is swung upwardly in the slot 21 and engages the latch, a cam action will take place which will swing the latch about its pivot 3| in opposition to action of the spring 32 which exerts inward pull upon the latch and causes the handle to be engaged in the recess or seat 33 of the latch back of its bill 38 when the handlereaches the upper end of the slot. It will thus be seen that normally the handle will be firmly secured and the trough maintained in its upright position until the latch'is grasped by the fingerpiece and moved to a releasing position which will allow downward movement of the handle. Movement of the handle through the slot 21 not only imparts turning movement to the trough and the shafts 24 and 25 but also causes thrust or pull to be exerted longitudinally of the shaft 25, and when the handle is swung downwardly in the slot, the trough will be shifted longitudinally in the cylindrical screen, as indicated by the dotted lines in Figure 2.

In order to agitate and thoroughly mix or intermingle sand and other ingredients placed in. the trough 23, there have been provided a plurality of paddles 35 having sleeves or hubs 35 which are disposed in end to end engagement with each other about a shaft 31 and extend the full length of the trough with the hubs of the end paddle abutting end walls of the trough. The blades of the paddles extend diagonally of the sleeves with certain of the blades at substantially right angles to the pitch of adjoining blades. Therefore, when the shaft 31 to which the blades are fixed is rotated, a very good agitating and mixing action will take place and the sand and other ingredients placed in the trough will be thoroughly intermingled. The shaft 31 projects from ends of the trough and has one end portion rotatably mounted in an axially extending pocket or bearing 38 formed longitudinally in the stub shaft 25 and its other end portion is rotatably received in aligned bores or openings 39 and 40 formed through the stub shafts 24 and I9 axially thereof. This end portion of the shaft 25 projects from the outer end of the stub shaft H! which is formed with clutch members 4| and at its outer end carries a clutch block 42 which is fixed to the shaft 31 by a pin 43 and at its inner end is formed with clutch members 44 for engaging the companion clutch members 4| when the shaft 3! is shifted longitudinally with the trough towards the right in Figure 2. Theshaft 3? is to rotate continuously during a mixing operation and sifting operation and constitute the main drive shaft for the mixing means and the sifting means. In order to rotate this shaft 3?, there has been provided an electric motor 45 mounted upon a bracket or shelf 43 which is braced, as shown at 41, the shelf being secured against the under surface of the outstanding flange E0 of the walls 2 by a suitable number of bolts 48 and the braces 41 being welded or otherwise secured upon the adjacent end of the bottom I of the box-like base. The shaft 50 of the transmission mechanism 5| which is associated with the electric motor is received in the socket 52 of the clutch block 42 and is provided with a key 53 which causes the clutch block and the shaft 31 to turn with the transmission shaft 50. In View of the depth of the socket 52, the shaft 31 and the clutch block may be shifted longitudinally of the shaft 50 without the clutch block moving out of engagement with the transmission shaft.

When this mixer and sifter is in use, the trough is disposed in the upright position, shown in Figure 5 and in Figure 1, and the sand and other ingredients are poured into the trough, it being understood that during this filling operation the hinged sections it of the screen will be swung to the open position indicated by dotted lines in Figure 3.7 The section It of the screen is then closed and secured by the fasteners I8, and as the shaft 37 rotates, the blades 35 will cause the contents of the trough to be thoroughly mixed. The fact that the handle 26 is engaged by the latch 28 will prevent the trough from being turned with the rotating shaft. Only a very short length of time is required for proper mixing of the sand and other ingredients in the trough and, there.-

fore, after closing the section IQ of the screen, it is only necessary to Wait a few minutes and then grasp the handle 23 and after moving the latch to a releasing position exert force to shift the lever through the slot 2] from the upright position shown in Figure 2 to the lower end of the slot where it will extend in the depending position indicated by dotted lines in this figure. During this movement of the'handle, the shaft 31 and the trough will be shifted longitudinally to the position indicated by dotted lines in Figure 2 and the trough turned from the upright position shownin Figure 5 to the inverted or dumping position shown in Figure 6, and the contents of the trough will drop therefrom into the cylindrical screen and also be scraped from the bot tom and walls of the trough by the blades 35. Longitudinal shifting of the shaft 31 will cause the clutch block to be shifted towards the stub shaft 99 and the clutch members 44 will be moved into engagement with the clutch members 4| so that rotary motion will be imparted to the cylindrical screen. The screen will, therefore, turn with the shaft 31 and the mixture will be sifted through the screen and onto the bottom of the box-like base and form a pile in this box-like base under the rotating screen. After the sifting operation is completed, the handle will be swung upwardly to the upper end of the slot 21 where it will be again engaged by the latch to secure the trough in the upright position and the screen will no longer have rotary motion imparted to it as the clutch block will return to the clutching position shown in Figures 1 and 2. The front wall 5 of the box-like base will then be released andswung downwardly to the lowered position shown in Figures 3 and 6 where it will rest upon the workbench and the core maker can have ready access to the mixture and use the same for,

forming sand cores. While it has been stated that the machine is to be used for mixing and sifting a sand mixture for use by a core maker, it will -be understood that it is'not limited to this specific use but may be made use of for mixing and siftingother materials which should be so treated prior to use.

Having thus described the invention, what is claimed as new is: 1.'A mixing and sifting machine comprising a rotatably mounted cylindrical screen, a trough in said screen mounted for turning adjustment from an upright position to an inverted position,

a rotary shaft extending longitudinally through the screen and trough, mixing means carried by said shaft within the trough, means for turning said trough from its upright position to an inverted position for dumping contents of the trough into the screen, and means for transmitting rotary motion from said shaft to the said screen when the trough is in the inverted position.

2. A mixing and sifting machine comprising a box-like base having a front wall movable from a raised position to a lowered position permitting access to material in the base, a cylindrical screen extending longitudinally in said base and rotatably mounted, a trough in said screen mounted for turning adjustment from an upright position to an inverted dumping position, a shaft extending through the trough and screen concentric thereto, mixing means carried by said shaft within the trough and serving as means for scraping material from walls of the trough when the trough is in the dumping position, means for imparting turning adjustment to said trough and shifting the trough and shaft longitudinally during its turning adjustment, and means for transmitting rotary movement from said shaft to said screen rendered operative when the trough is in the inverted position.

3. A mixing and sifting machine comprising base supports, bearings carried by said supports, a cylindrical screen, stub shafts extending from ends of said screen and rotatably mounted in said bearings, a trough in said screen, stub shafts extending from ends of said trough and rotatably engaged in the stub shafts of the screen to mount the trough for turning adjustment from an upright position to an inverted dumping position, a drive shaft extending longitudinally through the trough and screen with its end portion rotatably mounted concentric to the stub shafts of the trough and screen and projecting at one end, means carried by the stub shafts at one end of said trough and cooperating with a cam member for turning the trough to an inverted position and shifting the trough longitudinally during turning adjustment thereof, mixing means carried by said shaft within said trough and engaging ends of the trough to cause longitudinal shifting of the shaft with the trough, and companion clutch members carried by the protruding end of said shaft and the adjacent stub shaft of said screen for imparting rotary motion to the screen while the trough is in its inverted position,

4. A mixing and sifting machine comprising a support, bearings carried by said support, a cylindrical screen, stub shafts extending from ends of said screen and rotatably mounted in said bearings, a trough in said screen, stub shafts extending from ends of said trough and rotatably received in the stub shafts of said screen to mount the trough for turning adjustment from an up-- right mixing position to an inverted dumping position, a rotary drive shaft extending longitudinally through the trough with its end portions rotatably received in the stub shafts thereof and one end portion rotatably passing through the stub shafts at one end of said screen and protruding outwardly therefrom, a clutch carried by the protruding end of said shaft in confronting relation to clutch means at the outer end of the last-mentioned stub shafts of the screen, mixing means carried by said shaft within said trough and engaging end walls thereof to prevent longitudinal movement of the shaft and trough independent of each other, a handle extending radially from the stub shaft at the other end of said trough and extending through a slot formed in the companion bearing, the said slot extending spirally about the bearing for a portion of the circumference thereof whereby its walls constitute cam means for shifting the trough and the shaft longitudinally when the handle is moved through the slot to turn the trough from an upright mixing position to an inverted dumping position, the shaft when so moved shifting the clutch carried thereby into engagement with the confronting clutch means and causing rotary motion to be transmitted to said screen, and means for releasably engaging said handle and normally holding the handle in a set position with the trough in its upright position and the clutch of the shaft out of clutching engagement with the controlling clutch means of the screen.

5. A mixing and sifting machine comprising a box-like base having a front wall mounted for movement from a raised position to a lowered position permitting access to material in the base, a cylindrical screen extending longitudinally of said base and rotatably mounted, a trough in said screen mounted for turning adjustment from an upright mixing position to an inverted dumping position for delivering mixed material to the screen, mixing means in said trough, a rotary drive shaft for said mixing means, and means for transmitting rotary motion from said drive shaft to said screen when the trough is in its inverted dumping position.

6. A mixing and sifting machine comprising a base including spaced standards, bearings carried by said standards, a cylindrical screen, stub shafts extending from ends of said screen and rotatably mounted through said bearings, one stub shaft having clutch members at its outer end and the bearing for the other stub shaft being formed with a slot extending circumferentially thereof along a spiral path, a trough in said screen, stub shafts extending from ends of said trough and rotatably received in the stub shafts of the screen to mount the trough for turning adjustment from an upright mixing position to an inverted dumping position, the stub shaft having the clutch members and the stub shaft of the trough received therein being formed with aligned bores, the stub shafts extending from the other end of the trough being formed with an axially extending pocket, a handle extending radially from the last-mentioned stub shaft of said trough and through the slot of the adjacent bearing and constituting means for turning the trough to an inverted position and shifting the trough longitudinally in the screen, a rotary drive shaft extending longitudinally through the trough with one end portion journaled through the registering bores and protruding outwardly beyond the clutch members carried by the stub shaft of the screen, the other end portion of the drive shaft being rotatably received in the pocket of the stub shaft 'carrying said handle, mixing members carried by said shaft within said trough and having blades extending radiallyof the shaft and sleeves fitted about the shaft in end to end engagement with each other and the end sleeves engaging end walls of the trough to cause longitudinal shifting of the drive shaft with the trough, a clutch block carried by the protruding end of said shaft and having clutch members for engaging the clutch members of the stub shaft of the screen and causing rotation of the screen when the shaft is shifted longitudinally to an adjusted position as the trough is turned to its inverted dumping position, and power means including a shaft fitting into the clutch block, said clutch block being keyed to the power shaft to turn therewith and being slidable longitudinally of the power shaft.

the cam surface for shifting the container longitudinally during turning of the container, said container when shifted engaging the mixing means to shift the mixing means and the shaft longitudinally therewith, and companion clutch members carried by the shaft and the screen and interengaged to transmit rotary motion from the shaft to the screen when the container is in an inverted position.

' EDGAR H. TRICK;

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