US 1673927 A
Description (OCR text may contain errors)
June 19, 1928. 1,673,927
J. F. TURNER FOUNDRY SAND MIXER Filed Nov. 2, 1927 Patented June 19, 1928.
UNITED STATES PATENT OFFICE.
JAMES F. TURNER, OF BALTIMORE, MARYLAND, ASSIGNOR TO FLYNlil' & EMRICI-I COM- PANY, OF BALTIMORE, MARYLAND, A CORPORATION OF MARYLAND.
FOUNDRY-SAN D MIXER.
Application filed November In the mixing of foundry sand and core sand various adhesives are used to cause the sand to retain the form of the mold, also the sand being used repeatedly in successive molding operations accumulates dbris. The presence of the adhesive and debris creates a tendency to clog the mixingappa ratus. Nhile this mixing operation has been performed to a large extent by hand, it can be done much more quickly and economically by meansof a high speed beater or stirring apparatus, most conveniently operated by an electric motor, but the use of high speed apparatus creates a tendency to scattering of the sand by centrifugal force, projecting it outwardly at high speed, and where power has been employed the difficulty incident to protecting the motor and bearings from the sand and grit used in the machine has been difficult to overcome.
The present invention relates to a foundry sand mixing machine which is motor driven, the motor being above the heating or stirring apparatus, which is mounted directly on the motor shaft dispensing with gearing and eliminating all working parts in the vicinity of the grit with the exception of a single bearing beneath the beater.
The apparatus alsoincludes a funnel for. feeding the sand to the mixer and a hood enclosing the heater and interposed in the path of the discharged material, intercepting all particles projected outwardly and deflecting them down into the receptacle or bin placed beneath the heater for the reception of the mixed material.
The apparatus has the further advantage that the funnel and hood are formed in sections which can be instantaneously separated and swung backwardly one away from the other completely exposing the mixing member which is preferably in the form of a disk mounted on the motor shaft directly beneath the motor and provided with upright pins spacedapart and adapted to en gage and stir the sand and other materials as they are poured downwardly through the funnel onto the disk. I
In the accompanying drawings I have illustrated a foundry sand mixing machine embodying the features of my invention in the preferred form.
In the drawings:
Figure 1 is a. perspective view of the ma 2, 1927. Serial N0. 230,424.
chine with the funnel and hood open to expose the beater for cleaning.
Figure 2 is a fragmentary section showing the disk and bearing.
Referring to the drawingsby numerals, each of which is used to indicatethe same or similar parts in the difierent figures, the machine, as shown, comprises an upright frame 1 having at the top or in a corre sponding position a motor support 2 with clamping means 3 by which an electric motor 4 is held on the support, thesame having its axis vertical and its shaft 5 dependmg.
The machine also includes the sand mixer or beater 6 with a funnel 7 and hood 8, the funnel and hood being shown as an integral structure split on a central vertical plane into two equal opposite registering'sections 9 and 10 which may be swung into and out of registration or closed contact. The section 9 is mounted on a hinge 11 projecting on one side of the frame member 12 at one side of the machine and the section 10 is mounted on a hinge 14: projecting on the opposite side of the other frame member 15.
While the sections 9 and 10 of the funnel 7 and hood 8 are shown in Figure 1 as widely separated exposing the beater for cleaning, repairs or replacements, these sectious can be swung instantaneously into closed position, not shown, and in this position they may be locked or clamped by means of locking levers 16 engaging cooperating lugs 17 on the sections, particularly on the hood portions thereof adjacent. the outer or swinging edges 18.
Aside from the accessibility of the beater,
a feature of the invention which is of interest is the arrangement of the motor relatively to the beater and shaft. As already pointed out, the motor is placed at the top with its shaft 5 depending. The :beater shaft 20 which may be treated as an extension of the motor shaft is also an upright or depending shaft connected to the motor shaft 5 by a coupling 21. The beater shaft 20 extends downwardly to and through the beater which comprises a disk 22 secured to the shaft near its lower end and studded with upright pins 24 arranged along the periphery of the disk and extending upwardly therefrom.
The are preferably shouldered at 25.; l
the reduced portions 26 below the shoulders being passed through the disk and secured at. their lower ends by nuts 27. The heater shaft- :20, as aforesaid, extends downwardly through the disk, the short lower end 28 thereof below the disk being provided with a suitable bearing 29 carried by a transverse member 30 of the frame 1.
Itis of interest to note that the bearing 29 is protected not only by the disk 22 but additionally by a depending cylindrical fin on the disk enclosing the hearing which is further formed in a bearing block 36 projecting upwardly from the frame member 30. It should also be noted that the hood 8 is open at the bottom and spaced outwardly from the disk 22 to provide for the discharge of the mixed material in a downward direction.
In the operation of the machine, the various materials composing the foundry sand are introduced through the funnel 7 and dropped on the beater 6 which is rotated at a. high speed by the motor at. The material thus presented is thoroughly mixed by the rotating heater, the stirring action of the pins having been explained, and being thrown outward radially by the centrifugal action of the heater is projected downwardly by the hood 8 into the bin or other receptacle 37. t
On account of the debris collected by the sand from repeated use it is necessary to clean the beater from time to time and this is easily accomplished by releasing the hood clamps 16 and swinging the hood and funnel sections 9 and 10 apart to open position, as shown in Figure 1.
The arrangement of the machine with the electric motor at the top and the beater on the depending shaft of the motor is also of interest, the motor being thus kept out of range of the sand and grit without necessity for elaborate protection. This arrangement also accomplishes the result that the space around the heater is left free for the centrifugal. discharge of the mixed material and for the mounting and arrangement of the tunnel and hood so that the sections may be swung freely from open to closed position and vice versa, as described.
It is of interest to note that while the frame 1 is adapted to rest on feet or pedestals 31, the machine is also adapted to be suspended by means of a hook 332 engaging the eye 33 at the top of the motor clamp, the mixing machine being thus carried from place to place by a traveling crane or other overhead support, so that the material can be mixed and delivered at any desired point.
I have thus described specifically and in detail a mixing machine embodying the features of my invention in the preferred form in order that the nature and operation of the same may be fully understood however. the specific terms herein are used descriptively rather than in a limiting sense, the scope of the invention being defined in the claims.
hat I claim as new and desire to s-ecure by Letters Patent is:
1. A foundry sand mixing machine com' prising an electric motor having a depend ing shaft. a rotary mixing member secured to the shaft and spaced below the motor, the funnel and hood being formed in two sections, and means supporting said sections to swing laterally into contact enclosing the beater and into open position exposing the same for cleaning.
2. A foundry sand mixing machine having a heater, means for rotating the same about an upright axis, a hood and funnel enclosing the beater, the funnel being arranged above the beatcr to feed the material thereto. the funnel and hood being formed in two sections meeting on an upright plane of intersections, and means for sup 'iorting the respective sections to swing laterally from open to closed position and vice versa, the hood in closed position being open at the bottom and spaced outwardly from the heater to provide for the downward discharge of the same.
3. A foundry sand mixing machine comprising a heater mounted on a vertical axis to rotate in a horizontal plane, a hood enclosing the same and being open at the bot.- tom, the hood being formed in a plurality of sections meeting on an upright plane, and means supporting the sections whereby they may be moved from open to closed position exposing the beater for cleaning, etc, in the open position of the sections.
4. A foundry sand mixing machine having a motor. a depending beater shaft connected to the motor shaft, :1 disk mounted on the shaft, a bearing for the beater shaft beneath the disk. a. combined funnel and hood for the beater disk. the hood being open at the bottom and spaced outwardly from the disk as to its bottom edge, the hood and funnel being in the form of a plurality of registering sections. and pivotal means supporting the sections whereby they are permitted to swing laterally from open to closed position and vice versa, exposing the heater for cleaning, etc.
5. A foundry sand mixing machine, a motor at the top. the motor having its shalt upright, av depending beater shaft connected to the motor shaft. a heater mounted on the shaft, a bearing for the beater shaft beneath the beater. a combined funnel and hood for the beater, the hood being open at the bottom to provide for the discharge of the material from the beater, the hood and funnel being in the form of a plurality of registering sections, and pivotal means on the frame supporting the sections whereby they are permitted to swing laterally from open to closed position and vice versa, exposing the beater for cleaning and replacements, and
means at the bottom of the beater enclos- 5 ing and protecting the bearing.
6. A foundry sand mixing machine having a motor at the top, a depending beater shaft connected to the motor shaft, a beater disk mounted on the shaft, a bearing for 10 the beater shaft beneath the disk, a combined funnel and hood for the beater, the hood being open at the bottom, the hood and funnel being in the form of a plurality of registering sections, and pivotal means on the frame supporting the sections whereby they are permitted to swing horizontally from open to closed position and vice versa, exposing the beater for cleaning and replacements, an upright block supporting the said bearing and a depending fin on the disk encircling the block to rotect the bearing.
Signed by me at altimore, Maryland, this 28th day of October, 1927.
' JAMES F. TURNER.