US772642A - Face-plate for grinding-mills. - Google Patents

Description

. PATENTED OCT. 1 8, 1904. 0. CARB..v

PACE PLATE FOR. GRINDING MILLS.

APPLICATION FILED DBOJ?. 1903.

N0 MODEL.

. UNITED STATES Patented October 18, 1904.

PATENT OFFICE.

' FACE-PLATE- FOR GRlNDlNG-NIILLS.

SPECIFICATION forming part-of Letter: Patent No. 772,642, datedOctober 18, 1904.

i vApplication filed December 1'7, 1903. Serial No. 185,531.. v(No model.) i

To all whom, t may con/cern.:

Be it known that I, OuA CARR. a citizen of the United States, residing at Buenavista,

' county of Rockbridge, State of Virginia, have Vof the assembled machine; Fig. 2, a vertical sectional view of a portion of the grindingdisks;A Fig. 3, a face view of vone grindingdisk; Fig. 4, a similar view of the other grinding-disk; Fig. 5,y a detail vertical sectional view ofa portion 0f one of the grinding-disks, showing a slightly-different form of faceplate.

The ordinary attrition or face-plate grinding-mills of both horizontal and vertical types employ plates or disks upon which are cast various forms of breakers or nubs, the breakers on one disk being so arranged with respect to those on the other that the material placed between the disks is ground and broken up, the extent of grinding being dependent upon the clearance space between the grindingbreakers. `The breakersv or nubs are formed integral with the face-plates, such plates being removable in order that new plates may be inserted when the breakers have become worn to suchan extent as to impair the efficiency of the mill. The speed of these grinding-disks is very high and the wear upon the surfaces is rapid, so that to maintain the eiiiciency of the apparatus frequent renewals of the face-plates are necessary.

It is one of the objects of this invention to `provide a face-plate made up in segments, each segment being independently removable,

and toprovide each of these segmentswith independent removable breakers or grinding devices which are so mounted as to present numerous cutting-surfaces to the material worked upon, said surfaces or cutting-points changing their position during the rotation of the grinding-disks.

A further object of the invention is to provide the face-plates with removable breakers disk travel.

Vingvtlie operation of the apparatus.

Referring to the various parts by numerals, l designates a pair of grinding-disks, each of which is rigidly mounted upon the inner end of a shaft 2. The material to be worked upon is fed through the center of one of these disks by means of a hopper or chute 3. Each disk is provided with a series of segmental faceplates 4, which t closely within the annular outward-extending marginal iange 5 of the disk. Each face-plateis provided with a plurality of annular series or rows of apertures 6, in which snugly t horizontal outward-eX- tending screws 7. -These screwsdare provided at their inner ends with enlarged heads 8, which bear against the inner face of the'disk and lie between the same and the face-plate. These face-plates are secured rigidly to the disks by means-of bolts 9, .whose heads are counter sunk in the face-plate. By this means the bolts 9 serve to not only hold the face-platesin position on the disk, but also to maintain .the breakers 7 in position in the face-plates.

The breakers or grindingvdevices 7 of one disk are complementary to the grinding devices in the opposite disk, the breakers kof one disk forming races or ways in which the breakers or grinding devices of the opposite The projecting part of each breaker or grinding device is Yformed with a screw-thread or a similar annular or spiral groove in order that it'will present numerous sharp cutting edges to the material. While the bolts 9 will secure the segments of the face-plates to the disks, the cutting. devices or breakers 7 will be free to rotate independently inthe face-plates, so that fresh cuttingpoints will be presented to the material dur- In order to secure this freev rotation of the cutting devices, the face-plate segments are provided with lugs 4 to bear against the disk, and thereby prevent the bolts 9 from clamping the heads 8 against the disk tightly enough to prevent the rotation of the screws'7, as shown in 5. i

Itwill of course be understoodthat the grinding devices or breakers may project any desired distance beyond the face-plate and that the clearance-spaces between the breakers or grinding devices of the'two disks IOO may be as large as desired to adapt the apparatus to the work for which it is designed.

It will be readily understood from the foregoing description that when the grindingdisks are rapidly rotated in opposite directions the rows of screws or other many-pointed grinding devices will present numerous cutting contacts or points to such material as may be run between them, and because of the fact that the cutting devices rotate in the face-plates said devices will last a great while and maintain the eficiency of the apparatus. It is also obvious that it will be only necessary to remove the grinding' devices when they become worn or broken, the face-plates lasting indefinitely. It will of course be understood that this apparatus may be employed in a horizontal position as well as in a vertical position.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A grinding device consisting of a disk` a removable face-plate, and removable rotatable breakers or grinding devices removably secured to the face of the disk by the faceplate.

2. A grinding device consisting of a disk, a plurality of annular rows of breakers or grinding devices secured thereto, said devices being formed with a plurality of cuttingpoints and being freely rotatable independently of each other and the disk.

3. A grinding` device consisting of a disk, a face-plate removably secured thereto, and a plurality of rows of grinding devices or breakers rotatably mounted in said face-plate.

4. A grinding device consisting of a disk, a face-plate removably secured to the carrierplate, and a plurality of rows of breakers or grinding devices formed with a plurality of cutting-points and rotatably mounted in the face-plate.

5. A grinding device consisting of a disk, a face-plate formed in segments, a plurality of rows of breakers or grinding devices rotatably mounted in the face-plate and formed with heads on their inner ends, said heads lying between the disk and the face-plate, and means for removably securing the face-plate segments to the disk, whereby the grinding devices are secured in position.

6. A-grinding device consisting of a disk, a face-plate formed in segments, a plurality of rows of breakers or grinding devices rotatably mounted in the face-plate and formed with heads on their inner ends and with a plurality of annular cutting-points at their outerends, said heads lying between the carrier-plate and the face-plate, and means for removably securing the face-plate segments to the carrierplate, whereby the grinding devices are secured in position.

7. A grinding device consisting of a disk, a face-plate secured thereto, and a series of freely and independently rotatable grinding devices carried by said face-plate.

8. A grinding device consisting of a disk, a plurality of annular rows of breakers or grinding devices secured thereto and provided with a series of annular cutting-points, said devices being held rotatably in the disk.

9. A grinding device consisting of a disk, a face-plate formed in sections and removably attached to the disk, a plurality of breakers mounted in the face-plate and formed with heads on their inner ends and annular cutting edges on their projecting ends, said heads lying between the disk and the face-plate, and means for removably securing the face-plate sections to the disk, whereby the breakers are removably secured in position.

l0. A grinding device consisting of a disk, a face-plate and means for removably securing it to the disk, a series of grinding devices rotatably mounted in the face-plate and formed with heads on their inner ends, said heads lying between the disk and the face-plate.

1I. In combination with a grinding-disk, a. face-plate secured thereto and made up of independently-removable sections, and breakers attached to the face of the disk by said face-plate, these breakers being independently removable from the face-plate sections, and each being provided with a series of annular cutting edges.

l2. In a grinding-machine, the combination of a pair of rotatable grinding-disks arranged face to face, a plurality of rows of grinding devices on the face of each disk, the rows carried by one disk working between the rows carried by the other disk and the working faces of each grinding device being screwthreaded to provide a series of annular cutting edges.

In testimony whereof I hereunto aliix my signature, in the presence of two witnesses, this 16th day of December, 1903.

OMA GARR.

fitnessesz G. H. BAILIE, H. T. WiLsoN.

lOO

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