US1707198A - Polishing machine - Google Patents

Description

March 26,1929. w c. T. M'CGEHEE 1,707,198

I POLISHING MACHINE Filed Aug. 2, 1928 2 Sheets-Sheet 1 Hm Vf'algzw March 26, 1929. c, T; 'McGEHEE 1,707,198

POLlSHING MACHINE Filed Aug. 2, 1928 2 Sheets-Sheet 2 E g L,

Patented Mar. 26, 1929.

PATENT OFFICE.

UNITED STATES CHARLES T. MCGEHEE, OF HOUSTON, TEXAS, ASSIG-NOR OF ONE-HALF TO THE STAIN)- ARD RICE COMPANY, INC., nous'romrnxns, A CORPORATION OF TEXAS.

POLISHING MACHINE.

Application filed August 2,1928. Serial No. 296,880. r

This invention relates to new and useful Supported on and secured tothe supportimprovements in a polishing machine.

ne object of the invention isto provide a polishing machine polishing rice.

Anotherobject of the invention is to provide a rice polishing machine which will effectively polish the grain after it has been passed through the huller and the hulls removed, said polishing machine being effective to remove the dust from the grainand to polish the grain so as to give it a glossy appearance.

A still further feature of the invention is particularly adapted for to provide a rice polishing machine which will polish the grain with a minimum of breakage so as to produce a finished product with a higher percentage of whole grains than can be produced with pohshing machines now in common use. p Withthe above andother objects in view, theinvention has particular relation to cer tain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings wherein V Figure 1 shows a vertical sectional view of a section of the machine showing a section of the screen removed.

Figure 2 shows a" transverse sectional View taken on the line 2.-2 of Figure 1.

Figure 3 shows an enlarged fragmentary transverse sectional viewfand Figure 4 shows a transverse sectional view taken onthe line 4 --.4;.'o'f Figure 1. i 7

Referring now more particularly to the drawings, wherein like numerals of. reference designate similar parts in each of the and lower supporting members. these supporting members there is a vertically disposed cylindrical screen 3 formed of foraminated material. This screen is composed of a plurality of upright sections, each section being composed .of a frame work formed of the marginal upright bars a, 1, and the intermediate bar 5 connected by the upper and lower arcuate ribs 6, 6 and the intermediate rib 7. The foraminated material of the drum 3 is fastened to the inner side of the framesect'lonsof the frame so formed and the marginalbars 4 of each section are spaced from the corresponding bars of theadjacent sections fromtop tobottom.

figures, the numerals 1 and 2 designate upper Between ing 14 supported on the bracket8. There is i a drum 15 provided with the spiders 16 by means of which said drum is fastened onto the shaft 10. This drum islocated. within and isspaced fromthescreen 3 and issubstantially equal in length to said screen.

Fastened to the outside of the drum are the flexible members 15, preferably formed of leather whose upper and lower ends are clamped to the drum by the surrounding bands18, 18. These flexible members 17 consist of long strips and are so secured that their outer margins will befrec. The upper and lower ends of the screen are open. and fastened to the supportingmember 2, beneath the screen there is a hopper 19 into which the polishing grain is delivered. Above the screw and aligned with the upper end there of, there is an annular guide 20 which is se cured tothe upper supporting member 1 and whose lower margin is adjacent the upper end ofthe screen. The lower end of the screen is ered onto this table from the chute 22. An annular ring 23 is fixed to the table 21 by means of the brackets 24 and is spaced above said table so as toprovide a grain outlet 25 all the way around. Fixed on the shaft 10 are oppositely disposed paddle like arms 26 which sweeps around the upper surface of the table 21. These arms-throw the grain outwardly, by centrifugal force, and cause the grain to accumulate against the run 2?; and gradually feed through the space 25 all the way around. 1

Between the respective sections of the screen are the grain baffles which will now be described. UThese baflies are of similar construction, and are illustrated in the Figure 3. A description of one will sufiice for all. Each baflie comprises a channel having the outer wall board 27 and the side boards 28, 28 and from thereis a table 21. The grain is delivwithin the channel thus formed there is an anchor member 29 extending from end to endof the channel and faced with the facing BOcomposed of rubber or other similar material. Externally threaded shafts 31, 31 are connected to the upper and lower ends of the anchor 29 andextend outwardly through the corresponding board 27, and have the nuts 32, 32, threaded thereon. These nuts are retained in place by the flange rings 38, 33,

whichare bolted to, the boardQY. The nuts '32 may be turned, to suitably ust the grain baiiies, by means of the grip members 34, and

.said nuts may be locked against movement by the lock nut threaded onto the outer ends of the shafts 31. The side members 28 'ofthe respective baffle channels are secured between the respective marginal bars 14 of the screen frame Work by the bolts 36.

' Thegr'ain baffles thus restrict the space between the screen-'3 and the drum 15 and maybe adjusted toward and from the drum 15 as described. r

, The grain is delivered ontothe stationary table 21 and the drum 15is rotated at relatively a high rate of speed, the paddle like arms revolving with it. The grain is thrown by'centrifugal force outwardly against the vring 23 and is fed through the grain passageway 25 all the way around and falls between 'the drum 15 and the screen 3. The rotation of the drum will carrythe free margins of "the friction members 17 outwardly and these lected and ,disposedof in the conventional manner.

The friction members will be held in c'losevto the drum while passing under the grain baffles thus providing free spaces 37 into whichthe grain will becarried and in [which said grain will accumulate the grain .7 then dropping between the drum and screen into the hopper for future disposition.

iThe grainwill thus not be subjected to gtoo severefriction by the operation of the friction members 17 and will not be swept entirely around the screen but will be confined between the grain battles but will be held longenough to properly dust and polish the same. 7 Consequently the grain will not be unnecessarily broken by subjecting the same to atoo severe polishing process.

7 While I haveshown whatl now consider theupreferred form of the-invention it is clear that mechanical changes may be made ther'ei-nand equivalents substituted for the parts shown and I reserve the right to make 1 .such mechanical changes andsubstitutions as may be found desirable withm'the principle of the invention as defined by the appended claims.

What I claim is 1. A grain polishing machine including a cylindrical screen, a drum therein, flexible friction members on the outside of the drum, with their outer margins free, means for rotating the drum, means for feeding grain between the drum and screen and bailles disposed between the drum screen.

7 2. A grain polishing machine including a cylindrical screen, a drum therein, flexible friction members on the outside of the drum, with their outer marginsfree, means for rotating the drum means for feeding grain between the drum and screen and lengthwise baiiles disposed between the drum screen, said battles being radially adjustable.

.3, A grain polishing machine including a vertical cylindrical screen, a drum within and spaced from the screen and rotatable on an axis concentric with the screen, external friction members on the drum, means for retating the drum, means for feeding the grain into the space between the screen and drum, and spaced vertical bafiles between the screen and drum.

4. A grain polishing machine including a vertical cylindrical screen, a drum within and spaced from the screen and rotatable on an axis concentric with the screen, external friction members on the drum, means for rotating the drum, means for feeding the grain into the space between the screen and drum, and spaced vertical bafiles between the screen and drum, said bafiles being adjustable toward and from the drum.

5. A grain polishing machine including a cylindrical screen disposed with its longitudinal axis substantially vertical, a drum within and spaced from the screen and approximately concentric therewith external frictionmembers on the drum, means for rotating the drum relative to the screen, means for feeding grain by gravity downwvardly around the drum, longitudinal baffies spaced apart and disposed between the screen and drum, said bafiles having yieldable inside faces.

6. A grain polishing machine including a cylindrical screen disposed with its longitudinal axis substantially vertical, a drum within and spaced from the screen and approximately concentric therewith, external friction members on the drum, means for rotating the drum relative to the screen,

means for feeding grain by gravity downwardly around the drum, longitudinal baffles spaced apart and disposed between the screen and drum, said baffles having yieldable inside faces, and means for adjusting said bafiles toward and from the drum.

7. A grain polishing machine including a vertical cylindrical screen, longitudinal baffies spaced apart and arranged on the inside of the screen, a rotatable drum in the screen and spaced therefrom and substantially concentric therewith, external friction means on the outside of the drum which cooperate 1 with the screen, and means for adjusting the baffles radially.

In testimony whereof I have signed my name to this specification.

CHARLES T. MoGEHEE.

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