US2640650A

US2640650A - Hammer mill screen construction

Info

Publication number: US2640650A
Application number: US149403A
Authority: US
Inventors: Howard C Jacobson
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-03-13
Filing date: 1950-03-13
Publication date: 1953-06-02
Anticipated expiration: 1970-06-02
Also published as: USRE24147E

Description

June 2, 1953 H. c. JAcoasoN 2,640550 HAMMER MILL SCREEN CONSTRUCTION Filed March 13, 1950 4 Sheets-Sheet 1 W 'I I' 'll' W.

'WH' IH l HEJ HaW/YRD Cfdmasa/v June 2, 1953 H. c. JAcoBsoN 2,64050 HAMMER MILL SCREEN CONSTRUCTION Filed March 13, 1950 4 Sheetls-Sheet 2 June 2, 1953 H. c. JAcoBsoN 2540350 HAMMER MILL SCREEN CONSTRUCTION Filed March 13. 1950 4 Sheets-Sheet 5 How/0m 'ahmBso/r Muay June 2, 1953 H. c. JAcoBsoN 2,640,650

HAINER MILL SCREEN CONSTRUCTION Filed March 13. 1950 4 Sheets-Sheet 4 78 g FIE 5 How/W17 6.' (/kwsay upper fioor.

Patented June 2, 1953 UNI TED AT'ES HeMM-R:MLLSCRENNCQMSIRUQTQN Howarda*Jacobsomgst:Pal;-Minn. Application March 13, 1.9550,=serja1-1rmi testera '5 olaims. (Gazel-:8.9)

'This inventionremtesto a. zerndins 'imillfzand while :the inventzion might rbe'iapplicable .to vari- .ous types ofgrinding -;m-i11, -it is'partiularlytdesigned-forusefinrwhat is known -as a hammer mil'l' :Such hammer'zmills common1y comprise a leasing, :a rotatableisbeater :thereinfa screenzex- `tending `oircumferentially :about ;said'fbeater .at the lower :side vthereof, 'which screen ;is nsually removable and-'through :which-.the oommnuted panies .where the customers, usuallyffarmers,

V-usually located on'one floor ;while the discharge means for the ground -gramis ;located on ;an The customer. oftenwants'parts of the grain ground Ainto different Adegrees'of fine- Withl the `usual Vtype of mill it -was necessary .to go .down to the-millon-the ;lower floor and change the above mentioned Vscreen -sozas 'to use screens of'cliiferent'mesh to produce .the d-ifierent v grnds.

It is an object of thisl'invention'to ,provide a structure of grinding mill which will enablethe .operator to change'the structuretojprovide-products of different ldegrees' of fineness from the :upper :floor so'that it-wllV not .be necessary for him to go down to the'mill.

It is a further objectof the invention to pro- Vide a grindng fimill, preferably ofrthefhammer..

mill type, which comprises ;a casing,-a rotatable means in said vcasingv for comminutng the material, and a plurality of screens of different '-mesh disposed 'about said rotatablemeans, 'together with :means lfor rendering vone orzrnore:v Of :said

V mentoned Vscreens v:prefera'bly -being `fixed in position so as always to be in 1p1ace,::togetherrwith platesfor covering said last V^mentioned i screens for rendering the-same inoperati'vewand means extendi-ng Vto the floorv above the Vfloor ;on 'which the mili is located formovingzeither-of said plates 'to expose either Vof said last-:mentioned screens and 'render 'thezsame opera'tve.

These andother objects andzadvantages of 'the yinventon wi1l"be1fu11y:zset'iforthin' the .following description made iin connection V-wItth-:the accomznan-yieezdrewines in 7wieh ;like referencecharac- .t'ers refer tozsimilanparts,thronghout theseveral vview sfanzlin which-,-

`vPig. 1 isaviewinsideeleyation of the millof vthis iinvention g. 2.2isa' yertcal section .taken substantially .ton line. 2-2 of Fig. 1,,,a 'indicated Joy the arrows;

Pig 3- iS ;2L:=vert.0a1.;secti on .taken substantially 4 is-awiewin'front elevaton .of a plate used, -portion being ;broken away;

;Figi .is a view V,as seen from the rightof `I'ie. 4 Fig'. 6 isa.,suhstantially. Mertical section taken online 6-456 ;ofia 2,.as ndicatedby theuarrows;

and

'Lis-a -tllltioalzsecton taken von lline J- 'lcf .as-indicatedhby-the arrows, some parts zbei'hg shown fin different positions ,in ,dotted lines.

lneferrire i .to the -,drawines, a.erinlclinsV mill Of the hammer m'ill type is 'shown comprising a casing m. This leasing issupported ,on a :base

-membei' .li Awhich'also supports ,an electric motor .si-.2. Casing v ll V4has ,bearings [3 .at each ,ejnd V,thereof supported `nponthe toplof a portion [Ba I`of the casing cincewhichhearings is'journaled a drivingshaft Shaft .[5 isconnected by a conpling jtothe driving shaftjlZa of motor '|2.

i eenred Vtoshaft I Bare ra plnrality of plates 1| 8 shownzasrinfg-ronps ofjthree and four which a're ``dispose'zi at right angles to ;each other. 'The .tiletes tt are' :I'epetivalyseeured to a hub 18a which is in tUrnseeAired"toshaft [[5. ;Outer plates .2 gl ,and ,2d aresecured ,to shaft' l'5, the Msan'ie fbfiine' heldzaeainstzthe endshofhub l ahy nuts '23 .fthreaded onrSba-t 1.5. 'Ij'heplates L8, 20 aIldZl support rods .M- extendin'g `transyersely .there- .throng-handtherebetween which ,in turn rhave v swinging'ly mounted v`therfon ,beater arms. mms 2 5 ,are shown es mvinezholes ,2 5a extendine .therethrongh..,.so that .said 'arms can be reversed and have the :rodsg-M extendthrongh ,theQpenings 25a. ,Other similar. rqdsjfl, extend .between perted -thereinfandrods 21 also arryeries o'f the f-Ioeater.` arms :25. Shaft lt is .driven-,by ;motor .12 andfthe rotatablezbeater;comprising members |8 i -tond acts to comminnte themateriai to be -g'l'ou'ncl.

screen 38, ;shown .as ofisemiwylindrcalform, 'is oismsedfeirwmferelltiallt' about the lower ,side ,ofithe rotatablebeater, the upper .ends .of

,said screen-:engaging ,thezdownwardly Jconverging siees of anslef members 34 `.semlrefd .to plates AGD-form' i v 'i -.ioneitudmai1y offisereenr adiacent ;one plate smart .0 heQaSi-ne. ;Med 3:31 extends easy removal.

p bular member 69, i to members B8 and 69 and are spaced slightly 3| and is carried in a sleeve 34 having secured thereto projecting arms 35 which are pivotally connected to arms 38 pivotally secured at their other ends in easing |0. A semicircular rod 38, which is circular in cross section, is connected to sleeve 34 and extends centrally beneath screen 30 and is secured at its other end to a slecve or hub 39 through which passes a rod 40 also passing through sleeves or hubs 4| at each side of sleeve 3| and through sleeves 42 at the outer ends of

sleeves

40 and 4|, which latter sleeves have connected thereto narrow rods or strips 44. The sleeves 4| have secured thereto the lower ends of bent rods 45 which extend upwardly and through a bar 41 to which they are secured by nuts 48 threaded on the ends of said rods and engagin'g opposite sides of bar 41. Bar 41 has reduoed ends which are disposed in the sides of a bail 50 having pins 50a projecting outwardly from the lower portion of its straight sides, which pins are adapted to be received in either one of a plurality of recesses 51a formed in a bracket 5i secured by bolts 52 to a bar 53 extending transversely between the ends lc of casing |0. When the parts are in the position shown in Fig. 2 with the pins 50a in recesses 51a, screen 30 is held tightly in operative position with its inner side engaging spaced semi-circular members 55 secured to plates |0d forming part of the casing. When it is deslred to remove screen 30, bail 50 can be lifted to removeside thereof normally closed by a door 58. Doors B and 50 are held in closed position by swinging buttons 51.

In accordance with the present invention, a

pair of screens 60 and 0| are provided which are disposed at either side of the rotatable beater at the upper portion thereof, and in the embodiment of the invention illustrated, screens 60 and 6| converge upwardly. Screens 60 and 6| are designed to be always in place in contrast to screen 30 which is arranged for quick and The lower ends of screens 60 and 61 are secured to angle members 62 connected by bolts 63 to the angle members |0g forming part of the casing. Screens 60 and iii at their upper l' ends are secured to the diverging top surfaces of an angle member 65 by the bolts 66. Angle member 65 extends between the ends |0c of cas- Respectively overlying the screens Plates 61 are similar atits upper end is secured to a cylindrical or tu- Plates 61a are also secured from plate 61 and extend parallel thereto. Members 58 have spaced rollers 1| at their lower ends and these at their outer sides engage inwardly inclined bars 13 pivotally connected at their upper ends to the ends of casing and engagedat their lower ends by set screws 14 threaded into small brackets secured to the ends of casing |0. The members 69 at the upper 4 ends of plates 61 and 61a are pivotally connected to rods 18 which extend upwardly through the upper portion 10h of casing l0 which is shown as having a semi-cylindrical top. Rods 18 extend through lugs or bosses 19 secured to the top of portion 10h and said rods are provided with handle portions 18a at their upper ends. The rods 18 will extend to the floor above that on which base member H issupported. Portion |0h is shown as having doors 80 at either side thereof hinged at their lower ends and provided with handles 80a.

Casing l0 has an opening lfli at one end formving a feed opening and through which the material to -be .ground is directed by the bottom of a'chute or hopper 82 which extends at one end of the casing. i A chamber 10:1' is formed in casing 10 at the outer side of the

screens

30, 60 and 6|. An air conduit 83 is provided, which in the embodiment of the invention illustrated is V-shown as disposed at one end of casing |0, and

' said conduit communicates at its lower end With the bottom of chamber |07'. Conduit 83 is adapted to extend to an air separator at its upper end (not shown), which may be of the centrifugal or other type. Another conduit 84 is provided which in the embodiment of the invention illustrated is disposed at the other end of' casing [0 from conduit 83, and the same extends down to the top of hopper 82. Hopper 82 has an outwardly extending bottom portion 82a. at its inner side which extends to one side of chute 84. A plate 85 is pivotally mounted on a rod 86 at its upper end, said plate being freely swingable and being bent at an angle intermediate its ends so that its lower end can swing against the downwai'dly and inwardly inclined portion 82b of hopper 82. Rod 86 extends to one side of hopper 82 and is directed downwardly and outwardly away from casing (0 and provided with a weight 8? which may be disposed at different positions On rod 8G. Conduit 84 will extend from the separator to which reference has above been made.

In operation, motor |2 will be operated and shaft 15 andthe beater comprising members 18 to 25 will be rotated at high speed. The speed of such beaters varies from about 1500 to 3600 revolutions per minute. The material or grain to be ground is placed in the chute or hopper 82 and in the usual arrangement the grain is delivered from the wagons to a chute extending to the outside of the mill which conveys it to hopper 82. The ground material is delivered at the floor above that on which base member H iests and is sacked at this upper fioor. The material is struck by the beater arms 25 and driven lagainst the sides of the casing and screen 30 until it is sufficiently fine to pass through screen 30 or one of the other screens if the latter is operative. Should the customer desire a coarser grind than screen 30 produces, the operator on the floor above will pull up on one handle 18a. and will move upwardly rod 18, say the one at the right as seen in Fig. 2, and plates 61 and 61a will be moved upwardly to the position shown in Fig. 2. Rollers 68 will roll along the outer ends of screen 80. The material will now pass through screen 50 when it is suficiently fine.

Should a still larger grind be desired, the other into the bottom of chamber |07' and is carried up- Ward to the Separator above mentioned where the material will be separated from the air and discharged. The air and any material not separated will return through conduit 84 and will be directed by plate 85 through hopper 82 and into the feed opening lOi. A continuous circulation of air is thus provided through chamber |07` and to and from the separator. The plate 85 will swing outwardly to the desired position, such as that shown in full lines in Fig. 3, so that the air can pass by said plate. When the air draft. is off, plate 85 will swing to the dotted line position, thus closing chute 84. The air will be forced through the described circuit by a fan (not shown). The rotatable beater produces some fan effect.

From the above description it will be seen that I have provided a simple and easily operated means for securing different grades of the ground material which can be operated by the operator on the fioor above that on which the mill is supported so that the operator does not have to go to the lower floor to change any screen. The operator merely pulls up one or the other of rods 18 to uncover screens 60 or 6| as desired. The device has been amply demonstrated in actual practice, found to be very successful and efiicient and is being commercially made.

It will of course be understood that various changes may be made in the form, details, arrangement and proportions of the parts, without departing from the scope of applicant's invention, which generally stated, consists in a device capable of carrying out the objects above set forth, in the parts and combinations of parts disclosed and defined in the appended claims.

What is claimed is:

1. A hammer will having in combination, a casing, a rotatable beater in said casing, a screen extending circumferentially about said beater at the lower side thereof, screens of different mesh at the upper part of said beater and at each side thereof respectively, said mill being adapted to be located on one floor of a building, plates covering said last mentioned screens respectively for rendering the same inoperative, means extending upwardly from said plates adapted to extend to the floor above said floor, said means being adapted to be engaged by the operator for moving either of said plates upwardly to expose either of said last mentioned screens for rendering the same operative.

2. The structure set forth in claim 1, said last mentioned screens converging upwardly.

3. A hammer mill having in combination, a casing, a rotatable beater in said casing for comminuting material, a screen extending circumferentially about the lower side of said beater, means for holding said screen removably in place, a pair of screens of different mesh disposed about the upper portion of said beater at opposite sides thereof respectively and of different mesh than said first mentioned screens, said last mentioned screens being held continuously in position, and means for rendering either of said last mentioned screens inoperative.

4. A hammer mill having in combination, a casing, a rotatable beater in said casing, a screen extending circumferentially about said beater at the lower side thereof, screens of different mesh at the upper part of said beater and at each side thereof respectively, plates covering said last mentioned screens, means connected to said plates for moving the same upwardly independently to uncover either of said last mentioned screens, and means at the lower ends of said screens for wedging said plates and holding the same in place over said screens.

5. A hammer mill having in combination, a casing, a rotatable beater in said casing, a screen extending circumferentially about said beater at the lower side thereof, screens of different mesh at the upper part of said beater and at each side thereof respectively, plates covering said last mentioned screens, means connected to said plates for moving the same upwardly independently to uncover either of said last mentioned screens, and rollers on said plates supporting the same for easy movement.

. I-IO'WARD C. JACOBSON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 43,248 Wheeler et al Jan. 21, 1864 335,827 Mead Feb. 9, 1886 807,136 Spurgin Dec. 12, 1905 1,125,137 Liggett Jan. 19, 1915 1,374,207 Jacobson Apr. 12, 1921 1,627,766 Bergman May 10, 1927 1,698,758 Knittel Jan. 15, 1929 1,721,594 Hardinge July 23, 1929 2,227,090 Hughes Dec. 31, 1940 2,258,537 Calkins Oct. 7, 1941 2,328,170 Schutte et al. Aug. 31, 1943 2,488,714 Delp Nov. 22, 1949 FOREIGN PATENTS Number Country Date 18,611 Great Britain of 1912 358,200 Italy Apr. 8, 1938 703,825 Germany Mar. 17, 1941 630,671 France Dec. 7, 1927 798,382 France May 15, 1936