US1518422A - Grinder for reducing wood or other fiber to pulp - Google Patents

Description

Dec. 9, w24., 11,5%422 W. GREENE GRINDER FOR REDUCNG WOOD OR OTHER FIBER TO PULP Filed March l5, 1923 OTTO W. QREENE INVENTOR.

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@BEHEER )FR REDUCIENG W@ Cil/R @THEIR FREE. di@ PULP.

.eppicatien tiled march 15, w23. Serial 33o. 325,251.

To all -wwm it mayconcera;

Be it blown that l, 'r'ro W. GREENE, a citizen ot thev United States, residing at Elyria, in the countyof Lorain, State of 0hio, have invented a certain new and useful llmprovement in Grinders for Reducing Wood or Other Fiber to Pulp, of which the following is a specification, .reference` 'being had therein to the accompanying drawings.

This. invention relates to apparatus for making paper pulpand relat more particularly to grinders for cutting the pulp. Y

wood into pulp.

Practically all the pulp grinders used today are made of a natural stone. Many e'orts have been made to use grinders made of emery,`corundum and the like but none have been successful and so far as l amy aware none are' now in use. v

lt is well known that certain natural stones are well adapted and preferable for use in making grinders to'cut the wood into v pulp but hitherto, lso far as l am aware,

the natural stone 'grinders used in successfull grinding wood pulp have alwaysybeen ma e of a vsingle stone. The natural stone isrelatively soft, crumbly and fragile and" if once chipped between the ends, the stone is useless or greatly reduced in efficiency unless it be. turned away by special means' beyond the depth of the chip. Owing lto the-fact that the large stones are best adapted for the purpose of grinding pulp and owing to the fact that fissures or crevices frequently occur in natural stone which would destroy r greatly impair the stones use as a grindgr, large natural stones are relatively hard to find and expensive to produce. Many efforts have been made to build up these indersy from sections of natural stone butgrso far asy I am aware all former eorts have failed for.` one reason orl another. The stones have crumbled or chipped away at the joints orv have slip ed in the tnrninoF so that an uneven sur ace has resulted which has caused uneven grinding so that the stone was useless.

One `of the objects of this invention is to produceiapgrinder, built from sections' of stone, which grinder-Will not-chip, crum- 'ble or wear unevenly but which, on the con-- trary, will wear throughout its lifetime' in substantially'the same. manner as va slngle ,natural stone.

-to form a widths; v

The adjacent or contiguous surfaces of the stones are-parallel and slightly inclinedl from the normal. tothe axle axis. which -Another cbject of this invention is to protaching meansy unduly to the grin ing surface and without shortening the life of the stone. y

This and other objects of my invention will be apparent from the particular ydescription o the embodiment ot 'the invention illustrated in the vdrawing and .described in this' specification,

ln the drawings Fig. l is a longitudinal, medial section of the assembled sectional grinder a portion only et the shaft being shown, and means for securing 'the sections together being shown in elevation. Figure 2 is an end elevation of the sections comprising the grinder; and Figure 3 is a side elevation of the inner 4face of one of the sections. v

In the drawings 10 and l1 represent4 two disks or sections of stone which are securedv together to form thebody of a grinder which is used in grinding logs of wood or similar fibrous material into pulp, for use in paper making andother similar purposes.- lu/[preferably have shown a inder formed o larger number of sections could, be used grinder of the same or did'erent is horizontal in Fig. l, or to ythe aide' of the grinder. In the embodiment shown the ace is at an angle of 8 to a plane normal to the axle axis and this is the preferred inclination.

Theinner portion of the contiguous faces ofthe grinder 4sections may be cut away Aat 14, to provide a wider seam therebetween than is present at the outer grinding p0rtion of' the contiguous faces. The outer grinding portion 153 of the. contiguous faces are preferably parallel, exposing a minimum width of seam as the grinding survfaces wear down.

Aligned openings 16 extend longitudinally through the sectionsfof the grinder and terminate in o ckets l? formed at the outer walls thereo .In 't e embodiment shown pockets 18 are formedl in lthe inner contiguous walls of the sections, and as shown,

two sections, `but ifdeslred, a

the pockets,

harder or softer than the stone.

provide an enlargement of the openings 16 across the seam. lThese lpockets 18 may be formed separately from the openings 16 and the bolts, if desired.I and may be used as the sole longitudinal securing means or can be used in combination with the aligned openings. l

Bolts 19 extend through the. openings and and the ends thereof are threaded toA receive nuts 2() which, when screwed upon the bolts, lie within the pockets 17 and draw the sections together. The openings 16 are of suflicient diameter to receive the bolts and allow them to be entirely embedded in a plastic binder 21, such as cement, when unitedV together. llt is preferable vthat sufiicient cement he inserted to fill vthe inner and outer pockets land the openings around the bolts. A. similar binder 22 is placed between the contiO-uous inner faces of the sections filling the seamr therebetween.

The annular cementfilled seam, between the contiguous faces of the Stone sections, presents a surface which will remain Hush With the stone sections as they Wear down, regardness of Whether or not the cement is The cement Within the openings 16 and the pockets 18 provide rigid retaining members which will prevent the sections from separating When in operation. I

If desired, he cement in the bolt holes i can be. eliminated entirely and the. bolts alone relied upon, in which case a strong serviceable connection is maintained. The pockets in the aligned faces of the'sections, provide a dowel joint for the sections When filled with cement. The angular seam being Wider at the inner portion, also allows the outer surface yto be closely fitted in order to leave as little cement as possible in the portion of the stone lWhich is used for grinding.

' When in operation the assembled grinder is secured upon a rotatable shaft 24, which extends through an axial opening 23 .in the sections, and the peripheral surfaces thereof provide an unbroken grinding face.

Various changes in the details of construction can, be made Without departing from the spirit of the invention and the scope of the appended claims.`

What l claim is:

1. ln a inder for Wood pulp, the combination o a plurality of substantiallycym lindrical. sections made of natural stone, an axle upon which said stones are mounted, contiguous faces of said stones hein parallel to each other and slightly incline 'from a plane perpendicular to the long axis of release the axle, and means for rigidly binding said stones together at their contiguous inclined faces.

2. In a grinder for wood pulp, the combina-tion of a plurality of substantially cylindrical sections made of natural stone, an axle upon which said sections are mounted, the said sections being of the same diameter and having contiguous faces parallel and each slightly inclined from a plane perpendicular to the long axis of the axle, andy means for rigidly binding said sections of natural stone together including bolts or lindrical parts composed of sand stone pierced at the center for an axle, an axle upon which said stones are mounted, adjacent surfaces of said stones being parallel and inclined from the normal to the long axis of said axle, and means to rigidly connect said stones together including bolts 0E- set from said axle, and oementing material between the adjacent inclined surfaces of said stones.

' 5. lIn a rinder for Wood pulp, the combination ot a plurality of substantially cylindrical sections of sand stone, adjacent surfaces of said stones being parallel and being inclined from the normal to the main axis ofthe sections, and means for rigidly connecting said stones together. l

6. ln a grinder for Woodjpulp, the combination of a plurality of substantially cylindrical stones of the same diameter for mounting on an axle, contiguous surfaces of lsaid stones being parallel and slightly inclined from the normal to the axle axisof the stones," and means for connecting said stones rigidly together including a cementnlg material and a plurality of bolts or the 1 e. v

7. ln a grinder for Wood ulp the combination of a plurality of. su antially cylindrical stones having adjacent parallel surfaces inclined about ei ht degrees from the normal to the axleaxis and means for rigidly binding said stones together.

ln testimony whereof, lhereunto afx my signature.

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