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Publication numberUS1266894 A
Publication typeGrant
Publication dateMay 21, 1918
Filing dateJun 25, 1917
Priority dateJun 25, 1917
Publication numberUS 1266894 A, US 1266894A, US-A-1266894, US1266894 A, US1266894A
InventorsMilton F Williams
Original AssigneeWilliams Patent Crusher & Pulv
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Hammer for rotary mills.
US 1266894 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)




Patented May 21,1918.


Landsat. y

nILron WILLIAMS, or` Sr. Louis, Ivi'z'isso'nni, AssIGnonro WILLIAMS ramener cnUSIIER Ann ruLvrenIzEn COMPANY. or Sr. Louis, MISSOURI, A ooiaeonarroiv or MISSOURI.`


Specification of Letters Patent. Patmnted 1W ly 2m, ai.

. appiicatiiraied June 25,1917. Seriaino.176,75s.

To ahioiomt concern:

Be it, known that l.' MII/rox F-.VILLIAMS,

a citizenI of the UnitedStates. residing at` .the city of Sti LouisiState ofMissouri, have Invented. a certain new and useful Improvenient in Hammers, for Rotary hflills,` of which thev following is a full. clear. and exact description., such as will enableot-hers skilled in the art to .which it appertains to make and l nsethe same,` reference being had to the ,ac-

. conipaiiying drawings, forming part of this "fvfiousor'pointe'd out hereinafter, reference'- being had to' the' accompanying drawings, in

specification. .l i This invent-ion relates generally to rotar-y mills of ya t- Vpe inconimon use for the crush.

ing. shredding, grinding, or coinminuting Avof a great Variety of materials. In a more specific aspect. the invention relates to cer tain improvements in thefhaminers or beaters for use in such mills. i

The objects of the invention comprehend the. provision of an'improved forni of beater or hammer which is so designed as to give a maximum longevity or seryiceability with a uniform and consistent eiiiciency throughout its life. By the provision ofsuch an instrument, this invention accomplishes a decided increase in theeconomy and e-ii `ciencyof; operating machines of the class specified.` Otherob'je'ctsof 'the invention'will be ob- .Figure 1 represents f a longitudinal; sec! tional lelevation'of a Irotary mill` orl grinder equipped with lmy improved hammers or beaters; 1

Fig." Qreprese'ntsa-side elevation of' my improved hammerorbeater;

Fig. 3 represents'a: frontelevation thereof. Making reference to these illustrationsby means of the numerals applied, let it be niiderstood 'that 1 represents generally a frame" or casingI which forms a` support. and inclosure for the workingparts of a rotary linill; This mill includes a cage .or screen 2 disposed c'oiicentrically with an operating shaft-4f. upon which shaft are mounted disks or hammer n'iounts 5 in. which the hammers Gare pivotally:[mounted on pivot bolts: 7.

lln the illustration. the hammers 'are shown iii the positions whichfthey occup v." tlieoreti ciillv when the machine' isiii'operation. they being held out radially ofthe shatti by the 5,5 .centrifugal force ijeslltl'ting. from their niomentum and inertia accruing upon the ro tation of t-he sha-ft 4. The vcage 2 forms a cylinder in which the rotary menibersjust described are adapted to operate, and in the forni of machine illustratedIthe material to be reduced is fed into the cylinder by the operation of, feeding rollers 8 which are rotated to move the material into the .cylinder across a breaking or cutting plate 9. As the material is thus fed intofthe cylinder while the shaft 4 is rotating to .drive the .lia-miners in the direction indicated by the arrow, the hammers will be brought successively upon the material, and by virtue of the coactioiipieces as are not sutiiciently smallto pass through the interstices of the cage '2 will be subjected to the further action of the beaters or hammers in coaction with the portions of the cage until such pieces are further coniininuted to the requisite size or ineness.. This is the well known operation of mills of this type, and i-t is the utility of in v inven. tion to contribute to the. eii'ectiveness and the economy of this operation.

It will be seen by reference to Figs. 2- and 3 that the hammer or beater which coin-l prises iiiy invention is formed of al Hat .bar of metal which is shaped to provide a shank portion 10 which terminates at one end in a y pair of oppositely extending working points which are designated respectively` 11 and 11. Adjacent its other extremity the shank portion 10 is provided with an aperture l2 which isadapted to accommodate the pivot bolt upon which the hammer is vto be swung. l'The arrangement of this mounting mea-ns is such that the hammer is adapted to swingedgewise with either one or the other of the working points 11 or 11 in advance. Each of the working points hasl an inner margin 1i and an outer margin 15 extending to a front margin 16. Tlfe outer margin 15 is of somewhat greater extent than the inner margin 14. so that at. the

4junction of the outer margin andthe front size, eii'ectivelvl balance 'thelhammer so .as a5' maybe displaced from the inner margins of the pointy members, and. from the `portion 1S intermediate the Vpoint members, so as to form these point members somewhat thicker than the shank portion, as is apparent inv Fig. 3. e i

It has, been `described abovehow in the Ordinaiy""operation'of a machine, of this type, the beaters coperate with the breaker plate and with the cage. The continuous operation of beaters in a'maeliine of this kind resultsin a" wearing down of their working 'edgesduc to thej'abrasion and attrition 'of the material upon which they operate.'- In lig, Ihave indicated by a dottedflinemarked "1c`;`the formto which the working point ymay be worn down in time. Ai.v lian'imerso `worn, of course, has greatly reducecleiiicienc'y, as it is not so effective to sevei'the, `materialonthe breaker plate or' stood' that `thetwo .working points 11 and'y 11, being'practi'cally identical inform and to make lit hold thetrue'radius when in operati-on, and the reversal of the hammers rin the manner speciiied-,fkeeps the wear equalized on .thetwol point` members. When the second pointmei'nber has been worn down, the hammers maybe removed/from the mill, and"the-front margins of the point members ground rback to the form illustrated by Vthe' dotted line 'marked g. *rl-hue, it will be seen that ei'itirelynew`working 'edges and facesare provided 'onbotlr of' the point members,and the -point 'members are left at substantially uniform size' andfshape, so as to'maintain the balance ofthe "hammer, 'Attention was directed above tothe fact that the outer .margins 15 of the' working points are disposed substantially 'on' the arcyof theI cage. Consequently, the newworking edges formed by the dressingdown of the working points will been the same radius relative to the shaftgor the same arc, as lwere the original edges/In this fashion'the proper spacial relationship of the working- ,edges with the' breaker plate and cage ismaintained. and the efficiency of Ithe mill is kept at its highest point. U on thecontinuous operation'of th'einill an wear of the hammers` this` manipulationor reversal of the hammers 'and grinding l'down otvthe working I lpoints is repeated. the workin-'g points being gradually dressed back'in4 the-formI illustrated bythe successive dotted lines in Fig. 2. It will be observed that in all of these forms the workin-g edge is maintained substantially on-the same arc..

It will be observed that by virtue of this construction, the hammers have avery long life without any decrease in their effectiveness, and that the proper balance of the hammer is maintained"throughout its life so that it will operate upon the proper radius as well as upon the propei` arc. The forming of'the point members inthe manner above described not only increases their densityv and contributes to their durability, but also increases their eifective extent, as will be obvious upon inspection of Fig. 3 wherein the relative disposal of adjacent hammers is shown, and from which it' will be observed that the/effective working edges overhang the greater portion of the space intermediate the hammers occasioned by the interposition of the mounts 5.

I am aware thatthe device is susceptible of certain modifications and changes which "I have not described herein or specifically referred to. Accordinglv, it is my intention'that the appended claims be construed to comprehend such variations.

l, the mills cage` and said working points having'inner margins and front margins ex tendingfrom'said inner margins to the outer margins'and forming working edges at their lines of junction with the outer margins on the eii'ective radius ot the hammer.

2L In a rotary mill. ahaminer formed of fa flat-b arwh'ich is bilaterallv symmetrical and equipped' for suspension on itsy longitudinal axis adjacent one extremity. the other extremity of the bar being formed into oppositely projecting working points having their outer kmargins extending bevond the front and rear margins of the shank and disposed'siibstant-ially on the arc ofthe mills concave. said working points being formed also'with inner margins and front margins extending from the same to the outer margins and terminating at their outermost Ixtremities in working edges extending in he direction of the bars thickness.

In a rotary mill.' a hammer formed ot a flat bar-equipped yadiacent one extremity on its longitudinal' axis tor suspension on an operating shaft. and torinedl at its other extremity linto similar oppositelv directed working poi-nts extending outwardly a substantial distance in 'advance ofthe front and eeeeeee meer margins-.of the ber, the outer mergins at front nmfginswhlei-fform working edges 15Vy of which .Werking points form the termmal at their junctions with ,the outermer i'ns. edge of the hemmeham throughout the por- In testimony whereof I hereunto e 'x my tionshereof which exted beyond the liront signature this 220th day of June, 1917 and reen: merginsof the shank portion. are

disposed substentiay in acom'mon are deu 'MILTON F WHLLM'IISv serxb on e. radius' 'from the exis 'of'the Witnesses:

qpemtingf eheft, both the outer and inner ELLIoTr S. HAUSER,

margins 'of Worldng points terminating M. PLAISTED.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2566798 *Jul 6, 1946Sep 4, 1951Hiller Joseph LSelf-sharpening cutter tip for beater arms of hammer mills
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U.S. Classification241/195
Cooperative ClassificationB02C13/28