US2405692A - Grinding mill - Google Patents

Description

Aug. 13, J R HALL GRINDING MILL Filed March 27, 19 44- 707.02 fiHa-ZZ,

Patented Aug. 13, 1946 GRINDING MILL John R. Hall, Chicago, 111., assignor to International Harvester Company, a corporation of New Jersey Application March 27, 1944, Serial No. 528,224

' l v V V This invention relates to a new and improved grinding mill and has for one of its principal objects the provision of means for automatically releasing the cylinder concave upon entranc of some hard material which "would normally tend to break parts of the grinding mill unless the operation of the mill was halted in some way.

An important object of this invention is to provide a feed grinding mill capable of having its concave released from its operative position adjacent the cylinder either manually or automatically.

Another and still further important object is to provide a hinged concave yieldably held in position adjacent a cylinder which is automatically releasable and capable of repositioning by a mere manual swinging of the concave.

Other and further important objects willbecome apparent from the disclosures in the following specification and accompanying drawing, in which:

Figure 1 is a longitudinal sectional view of the grinding mill of this invention;

Figure 2 is a sectional view taken on the line 22 of Figure 1; and

Figure 3 is a sectional view similar to Figure 2 with the concave in released position.

As shown in the drawing, the reference numeral l indicates generally a housing for a grinding mill and includes a feed inlet hopper I l which permits grain. or other material to be ground to reach a cylinder l2 which, as shown in Figure 1, has a spiral flighting I3 extending around the periphery and lengthwise of the cylinder. closely adjacent the cylinder I2 50 that material carried by the spiral flighting i3 is compressed and partially ground against the concave I l. In order to more thoroughly grind material, the inner surface of the concave I4 is roughened as at I5 and shown in all thefigures of the drawing.

The concave I4 is hinged above the horizontal center-line of the cylinder 12 at Is to lugs H which form an integral part of a casting l8 bolted or otherwise attached as shown in Fi ure 2. A cutting blade 2| is bolted to the upwardly extending flanges l8 at 22 and extends inwardly to a point very close to the periphery of the cylinder spiral flighting l3. The cylinder I 12 rotates in a counter-clockwise direction as viewed in Figure 2 and indicated by an arrow 23. It will be apparent that as material to be ground is fed longitudinally by the spiral flight- A concave i4 is positioned beneath and 1 Claim. (01. 241---239) 2 ing {3 it Will be positively sheared by the cutting bladeZl.

The lower end of the semicylindrical concave I4 is equipped with an outwardly extending radial flange 24, the surface of which is inclined as'shown at 25. The flange 24 is adapted to abuttingly engage a member 26 which is rigidly afiixed to the hopper walls H. A release lever 21 is hinged at 28 on rearwardly extend-ing hinge lugs 29 of the member 26. The forward portion of the lever 27 has an inverted V-shaped surface including inclined sides 30 and 3| and an apex 32. i

The lever 21 has a relatively large opening 33 through which a long bolt 34 is adapted loosely to pass. The bolt 34 extends through the hopper wall H, through the member 26, and thereupon through the opening 23 in the lever 21. The bolt 34 is retained in its position by means of a head 35 at its upper end and a nut 36 at its lower end. A spring 3'! is interposed between the nut 36 and the lever 21, thereby resiliently maintaining the lever 21 in its uppermost position as shown in Figures 2 and 3. The yieldable latch is below the horizontal centerline of the cylinder and on the opposite side from the hinge Hi.

In Figure 2 the concave I4 is yieldably locked in an operative position adjacent the cylinder l2. The inclined surface 30 of the lever 21 engages the inclined surface 25 of the concave flange 24. It is possible in feeding grain or other material to a grinding mill to accidentally put in some foreign object such as a rock which would be hidden by the grain and which would tend to cause great damage to the machine parts of a feed grinder unless some safety means was provided. At the present time wooden shear pins are employed to a great extent to prevent such accidents, but this method has proved inconvenient in reassembling the grinding mill in order to resume operation.

The action of the'present device is to automatically permit the inclined surfaces 24 and 30 to slide apart relative to each other and thus permit the concave to swing about its hinge I5 and take the position shown in Figure 3. The releasing of the concave is instigated upon overcoming the force of the spring 31. Therefore, when an obstruction enters the cylinder and concave, a downward force is applied to the concave M which acts directly on the spring 31 through the lever 21. It is obvious that no parts will be broken, and that the obstruction, whatever it the concave I4 is manually swung about the hinge l6 so that its flang 24 will ride up on the inclined surface 3! of the lever 21. Inasmuch as the concave M has a fixed arcuate movement, it will be apparent that the release lever 21 must yield downwardly against the action of the spring 31. Immediately upon the flange 2 4 riding over the apex 32 of the lever2l, the spring; 3;! forces: the lever 2T upwardly so that the flange 24' rides down the incline 30 and thereupon locks the con; cave in the position shown in Figure 2.

The spiral flighting l3 of the cylinder [2. 126.1 forms two functionsfirst, that of preliminarily breaking up material to be; ground andl e nsir that of feeding the grain longitudinally of the cylinder I2 to grinding plates 39 and 48. The

plate 31 is permanently fixedtn the; housing 10;

of the grinding mill, and the plate 49 rotates with the cylinder [2. Material to be ground is extruded between the plates 39 and 40 and then carried by thrower blades- 41 to some depositorya The means for driving the cylinder l2 and plat'e 4llma-y-be one'oi several devices sucl'ra's an' electric-motor or frornthepower 'GEKBfOfi Off a tractor; whichever is-a-vailable; A lever 52 is provided on theoutside of the-feed grinder and permits adjustment of the plates $9 and Ml with respect to each other. a

Anopening 43 is provided inone the side walls I i) of the-feed grinder to enable an operater toinserthis arm and pull d'ewn on the lever; 21'

and hence manually release the concave M. A plate M hinged as at 45 or otherwise fastened is adapted to cover the opening 43. Such manual releasing may be necessary in cleaning out the feed grinder Or for any other purpose which is deemed advisable.

It will be apparent that herein is provided a novel; concave, for feed grinders having a resilient locking means which permits automatic releasing T of the concave as well as automatic relocking of the concave upon giving the concave a manual swing,

The intention is to limit the invention only within the; scope of: the appended claim,

What iscl'aimedis: In a material treating machine comprising a housing; arotatable cylinder within said housing,

a concave partially surrounding said cylinder, said concave being hinged at one side of said cylinder and fastened by means of a yieldable latchat" the other side of saidcylinder; said yieldable latch having means for" automatically releasing the concave upon the attainmen-t of a predeterminedpressurebetween said cylinder and concave; and further means for manuallyreleasing said ceneave, said 'la'tch comprising a hinged lever -havinganinclined porticn-slidably engaging abe'veled lugon the-concave, aspringadapted-to normally hold-said lever in: engagement withsaid beveled-lug. V V

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