US2543164A - Bumper and screen plate combination for rotary hammer mills - Google Patents

Description

Feb. 27, 1951 J. HARRENSTEIN I 2,543,164

BUMPER AND SCREEN PLATE COMBINATION FOR ROTARY HAMMER MILLS Filed June 8, 1948 3 SheetsSheet 1 z 14 33: 7 J6 F I r 3 3 IN VEN TOR.

Feb. 27, 31951 J. HARRENSTEIN 2,543,164

BUMPER AND SCREEN PLATE COMBINATION FOR ROTARY HAMMER MILLS Filed June 8, 1948 5 Sheets-Sheet 2 Feb. 27, 1951 J. HARRENSTEIN 2,543,164

BUMPER AND SCREEN PLATE COMBINATION FOR ROTARY HAMMER MILLS Filed June 8, 1948 3 Sheets-Sheet 3 Patented Feb. 27, 1951 BUMPER AND SCREEN PLATE COMBINATION FOR ROTARY HAMMER MILLS J acob Harrenstein, Forreston, Ill.

Application June 8, 1948, Serial No. 31,707

My invention relates to rotary hammer mills, and more particularly to a combined bumper and screen plate for use therewith, whereby to achieve a more rapid and more efficient grinding of grain or the like.

An object of my invention is to provide a combined bumper and screen plate for rotary hammer mills.

A further object is to provide a combined bumper and screen plate for rotary hammer mills which includes a screen portion intermediate a pair of bumper portions for agitating grain on both sides of the screen portion.

A further object is to provide a combined bumper and screen plate for rotary hammer mills, together with novel means for mounting the same in a mill.

Other objects and advantages reside in the particular structure of the invention, combination and arrangement of the several parts thereof, and will be readily understood by those skilled in the art upon reference to the attached drawing in connection with the following specification, wherein the invention is shown, described and claimed.

In the drawing:

Figure l is a rear elevational View of a rotary hammer mill embodying the invention;

Figure 2 is a transverse vertical sectional view through the mill;

Figure B is a horizontal sectional view taken substantially on the plane of the line 3-3 of Figure 2 Figure 4 is a transverse Vertical sectional view through a combined bumper and screen plate according to the invention;

Figure 5 is a plan view thereof;

Figure 6 is a perspective view of a separate bumper-plate according to the invention.

Figure 7 is a sectional view taken along the line 1! of Figure 2 with the bumper plate removed.

Figure 8 is'a sectional view taken along'the line 8+8 of Figure '2, with parts broken away and with the combined bumper and screenplate removed.

Referring specifically to the drawing, wherein like reference characters have been used throughout the several views to designate like parts, It] designates generally a hollow base section for a hammer mill which mounts a discharge trough H for ground grainor the like which receives such grindings from the superjacent mill. Ground grain is discharged from the trough H by means of a screw conveyor or 3 Claims. (Cl. 241--88) the like l2. An upper or cover section I3 for the base I0 is hinged thereto by any suitable hinges I4, and mounts an inlet spout 15 through which unground grain is fed to the mill. The side walls of the cover and base sections I0 and l 3 have mounted therebetween a shaft I"! mounting a plurality of radially-directed beater arms l8 having hammers is formed on the ends thereof. As so far described, the mill according to the invention is conventional and forms no part of my invention. 7

Any suitable means, such as the motor 20, is utilized to drive the shaft ll, whereby to rotate the beater arms l8 and their associated hammers H3. The motor 2|] may be mounted on any suitable bracket 2| outwardly of one side of the mill.

The base portion ll) of the mill is provided with a floor 24 for the mill which is in the form of a semi-cylinder, the semi-cylinder floor being formed with a discharge opening 25 for the discharge of ground grain or the like into the discharge trough II. The opening 25 extends inwardly of and is spaced from one of the side and both of the end edges of the semi-cylinder 24 and terminates at a point substantially midway of the semi-cylinder. Each of the end edges of the semi-cylinder is provided with embracing means which face each other, such means taking the form of an inwardly directed flange 26 which is spaced from the adjacent portion of the semi-cylinder 24 and forms therewith a groove. A combined bumper and screen plate 21 conformably shaped to fit within the fio'or 24 or in the form of a semi cylinder is insertable between the facing grooves and is pushed inwardly until the plate is completely superposed upon the semicylinder 24. The plate 21 comprises an imperforate quarter segment of a cylinder 28 having a plurality of spaced protuberances or rounded bumpers 3D projecting from a face thereof and a perforated or screen quarter segment of a cylinder 29 arranged in side by side relation with respect to imperforate segment 28 and secured thereto. The plate '21 is positioned with respect to the semi-cylinder 24 so that the imperforate segment 28 with its bumpers 30 facing outwardly overlies and abuts the adjacent portion of the cylinder 24 and the screen or perforated segment 29 overlies the discharge opening 25 and abuts the adjacent bounding side and end portions of the semi-cylinder floor 24. It is to be noted that the plate 21 is applied to the semi-cylinder floor 24, after the cover I3 has been raised, by inserting the free end 34 into the grooves at the right 3 hand side of the mill, Figure 2. The plate 21 is then slid around until the leading edge 34 encounters any suitable stops 33 formed on the flanges 26.

There is no particular need to fasten the plate 21 in place, as will be apparent hereinafter.

Referring now to Figure 2 and to Figure 6, that portion 42 of the cover l3 between the inlet opening l6 and the free edge 40 of the cover I3 is likewise provided with embracing means facing each other, said means embodying inwardly directed flanges 4!, Figure '7, which are concentric to the portion 42 and provide therebetween a pair of opposed grooves. A bumper plate 35, Figure 6, which is of the same configuration as the portion 42 or in the form of a segment of a cylinder insertable between the opposed grooves formed by the flanges 4!. The bumper plate 35 is preferably of double thickness and comprises a pair of plates 36 and 31 arranged in superposed abutting relation with respect to each other and secured together. As shown in Figure 6 a plate 31 is in the form of a segment of a cylinder and has one of its end edges turned inwardly to form a shoulder 39, the shoulder being spaced from the adjacent portion of the plate to provide a groove. Positioned in superposed abutting relation with respect to the plate 31 and having one end extending into the groove formed by the shoulder 39 and the adjacent portion of the plate 3'! is a plate 36. With the cover [3 raised the plate 35 is inserted therein from the end thereof adjacent the free edge 40. This movement is continued until the shoulder 39 of the inwardly turned end edge 38 abuts the ends of the flanges 4I- and prevents further movement. At this time the opposite ends 43 of the plates 36 and 3'! are substantially flush with the inlet opening Hi. It will be noted that when the cover I3 is closed, the double thickness, or rather triple thickness, of the lower end of the bumper plate 35 overlies the ends of the grooves provided by the lower flanges 26 and prevents sliding movement of the lower plate 2'! in such grooves. Inasmuch as the stops 33 limit movement of the plate 21 in the opposite direction, the plates 21 and 35 are securely positioned in place without the use of bolts or screws. The bumper plate 35 is likewise provided with a plurality of transversely-extending protuberances or bumpers 45 which are substantially similar to the bumpers 30 of the plate 21. It is apparent, thus, that the trailing edge 44 of the plate 21 not only is prevented from escaping from its groove by engagement with the lower end of the bumper plate 35, but the latter is likewise prevented from escaping from its grooves by its engagement with the trailing edge 44 of the plate 21.

Thus, it is apparent that I have provided novel means for securing the plates in place without the use of bolts, screws or the like. At the same time, by providing the particular plates of the invention, the grain fed to the mill through the spout I5 and inlet opening I6 is agitated or held back by the bumpers 30 and 45, so that the hammers l9 have a better chance to hit the grain. That is to say, the grain bounces off of the bumpers and is thrown into the path of the hammers l9 to insure better pulverization of the grain. When the grain is sufficiently pulverized, it escapes into the discharge trough H through the perforations 3| in the screen sec- 4 4 invention, it is to be understood that the same is susceptible of other forms and expressions. Consequently, I do not limit myself to the precise structure shown and described hereinabove except as hereinafter claimed.

I claim:

1. In a rotary hammer mill including a semicylinder floor, said floor being provided with a discharge opening extending inwardly of and spaced from one side and both end edges of and terminating at a point substantially midway of said semi-cylinder floor for the discharge of grain therethrough, embracing means engaging each of the end edges of said semi-cylinder floor and facing each other, and a combined bumper and screen plate conformably shaped to fit within said semi-cylinder floor insertable between the facing embracing means and superposed upon said floor, said plate embodying a pair of segments arranged in side by side relation and secured together, one of said segments being provided with a perforated screen and the other of said segments being imperforate and having one face provided with a plurality of spaced protuberances projecting therefrom, the screen segment overlying said discharge opening with the imperforate segment overlying the adjacent portion of said floor.

2. In a rotary hammer mill including a semi cylinder floor, said floor being provided with a discharge opening extending inwardly of and spaced from one side and both end edges of and terminating at a point substantially midway of said semi-cylinder floor for the discharge of grain therethrough, an inwardly directed flange engaging each of the end edges of said semicylinder floor and spaced from the adjacent portions thereof to thereby form a groove, the grooves facing each other, and a combined bumper and screen plate comformably shaped to fit within said semi-cylinder floor insertable between the facing grooves and superposed upon said floor, said plate embodying a pair of segments arranged in side by side relation and secured together, one of said segments being provided with a perforated screen and the other of said segments being imperforate and having one face provided with a plurality of spaced protuberances projecting therefrom, the screen segment overlying said discharge opening with the imperforate segment overlying the adjacent portion of said floor.

3. In a rotary hammer mill including a semicylinder floor, a semi-cylinder cover superposed upon said floor and connected to the latter along one of its side edges for opening and closing movement with respect thereto, said cover being subdivided into two portions with one portion having embracing means engaging each of the end edges and facing each other, said floor being provided with a discharge opening extending inwardly of and spaced from one side and both end edges of and terminating at a point substantially midway of said semi-cylinder floor for the discharge of grain therethrough, embracing means engaging each of the end edges of said semi-cylinder floor and facing each other, a combined bumper and screen plate conformably shaped to fit within said semi-cylinder floor insertable between the facing embracing means and superposed upon said floor, said plate embodying a pair of segments arranged in side by side relation and secured together, one of said segments being provided with a perforated screen and the other of said segments being REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 978,034 Kinsey Dec. 6, 1910 991,477 Buchanan May 9, 1911 1,354,855 Simpson Oct. 5, 1920 1,420,354 Williams June 20, 1922 1,606,692 Brooks Nov. 9, 1926 2,066,621 Gray Jan. 5, 1937 2,215,226 Meyer Sept. 17, 1940 2,385,767 Wagner Sept. 25, 1945

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