US1571812A - Grinding mill - Google Patents

Description

Feb. 2 1926. 1,571,812

. S. SNYDER GRINDING MILL 7 Filed March 28. 1923 2 Sheets-Sheet 1 Feb. -2 1926. 1,571,812

S. SNYDER GRINDING MILL Filed March 28. 1923 2 Sheets-Sheet 2 5440mm Simon Snyder Patented Feb. 2, 1926.

UNITED sra'rssearear seics.

srmon SNYDER, or MUNCY, PENNSYLVANIA, Ass'r'enoa T0 seaoor, watnaona 00., or MUNCY, PannsYLvAnm, A conroaarron or rsnnsznvnnra.

GRINDING MILL.

AppIication filed March 28, 1923. Serial No. 628,368.

To all whom it may concern:

Be it known that I, SIMON Snnnnaa citizen of the United States, residing at Muncy, in the county of Lycoming and State of Pennsylvania, have invented certain new anduseful Improvements in Grinding Mills; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to milling machines and more particularly to grinding mills, in which opposed grinding plates or disks are used to grind wheat or other gram.

The object of my invention is to provide a milling machine which may be quickly disassembled for the purpose of exposing the interior to convenientinspection and permitting ready access to the grinding plates or disks for adjustment or removal and replacement, without requiring a complete disassembly, disarrangement or loosening of fixed parts, and without necessitating the removal or displacement of the drive shaft from its bearings.

A further object is to provide anovel twopart, separable shaft, in connection with milling machines, one part of which may be readily disconnected from the other part without disturbing ordisplacing the latter when the machine is partially disassembled. Thus, one end of the machine, through which when assembled, the united shaft extends, may be left wholly intact, while the other end is unbolted and removed from place.

Simplicity of design and arrangement of parts, economy in time and labor afforded for repair and adjustment, accessibility and maximum strength and durability, are fur ther desi'derata which have been borne in mind in the production of my improved 2'is an end elevation of-the same,

taken on the line 2-2 of Fig. 1;

Fig; 3 is a sectional side elevation of the assembled machine shown in Fig. 1, taken on a vertical plane through its axis, the shaft being shown in elevation;

Fig. tis a fragmentary elevational view, partly in section, of the separable drive shaft and bearings; V

Fig. 5 is an elevation of the shaft taken at right angles to Fig. 4, the bearings being omitted; and

Fig. 6 is a fragmentary eleva-tional view of the shaft illustrating a modification.

Referring to the drawings, in which like reference numerals are used to denote corresponding parts throughout the several views, 7 denotes a cast iron or other metal supporting base, to which the superstructure of the mill is rigidly bolted. A feed outlet or dischargepassage 8 (preferably of inverted frusto-conical shape), is formed or provided in said base so as to extend vertically therethrough at one end. A chute (not shown) may be connected at the lower extremity of said outlet passage to convey the comminuted material to any desired point.

A drum-like metal casing which is closed at the top but open at the bottom and formed by oppositely related, separable sections 9 and 10, is rigidly bolted to the base 7 with the constricted open bottom of the casing in direct communication with the feed outlet pasage S. Marginal flanges are formed'at the lower extremities of the sec tions through which bolt holes, corresponding with similar holes in the base 7, are provided to receive fastening bolts. Corresponding radial apertured lugs 11 and 12, are also formed on the outer peripheral margins of sections 9 and 10, respectively, through which suitable bolts are passed to firmly secure. the two sections together.

A circular feed inlet opening 13 is formed through the Vertical wall of the section 10, and a feed hopper 14 is mounted by suitable clamping means at the top of the section in line with said opening. A revoluble agitator -15, keyed to a driven shaft 16, (to be here inafter more particularly referred to) is located within the lower portion of said hopper between its tapering walls.

An oblong, opensided chute 1'? is suitably clamp-ed or screwed into place against the vertical wall of section 10 of the casing with its open side toward and extended below the inlet opening 18, the open end of said chute registering with the lower opening in the hopper, and the closed end thereof providing an inclined bottom for the vertical feed passage 1% thus termed in comunieation with said inlet ening.

A rezrnlatint. closure plate ll), movable 1nwardly and outwardly between suitable guide-ways; by ineana of an adjusting acrcw bolt fil irprovided at the base of the hopper to control the amount of material released there'lron'i into the feed passage.

Alined shatl journal bones ll and 22 are securely bolted at opposite sides ot the easino to sections 5) and respectively, by means: ot suitable yoke members 2 and El, which are preferably formed integr: l therewith aa Shown. An end jonrna box is also provided in alineinent with said lirat mentioned boxes, which is rigidly supported by an upright bracket or standard 26 lirinly bolted "to the base 7. leinovahle cover plates or caps are provided for each of these journal boxes.

A, r-eparable drive ehatt formed by cooperable and colnplcnientary parts 2 and 28, is jonrnaled in radial and end-thrust ball bearings 29 provided in each of the journal boxes El. and An ordinary belt pulley 3 is keyed to part 27 of the drive shaft. and is driven by an endless belt extending therelrom to a revolving element on a power unit (not shown). A strap pulley Jll. is rotatable with the part Qll ot the drive shalt. by means of an elongated groove or heyway 2U formed in the ehal't into which the tree end ol a set screw 31" extending radially through said pulley pro joelw' to lvoy the pulley lo the ahal't. whilo pm'niillinn; the pulley to move longitudinally lhereoi'. From the pulley ill, an endstrap 23:. extended over a driven pulley lieycd to one end ol the agitator shaft us. r nilahle hearings are 'l'ornied or plan rided at the top oi sections t") and ill of the casting to r llpporl. (his Shal't.

.l l-nclosod within the caning: are. opposed grinding: disks or platen ll and 15. the plate l being: securely bolted to and revolublc with a huhhed dial; 2H5 keyed to the part :Ztl ol' the drive shatt. while the plate $135 is stationary and rigidly bolted to the inner vertical wall oli section 10 ol the. 'asing, with itaeyelet or central opening correaponding: with the inlet opening l3 in said exertion. .hl eycd lo the part E2 ot the drive shalt and located axially within the inlet. parnag e lit. in a rotatable teed promoting member or conveyor ST having inwardly tapering triangular blades; 38 at one end and l'lateided oblong blades till at the other end ting; radially thcre'l'roin. The ten deney ot the trian -grular blades to urge the t'eed between the grinding); plates; 23 i and 85 as, it 'l': from the ho n'ier into the feed passage 18. It will be observed by reference to Fig. 3 ol? the drawings that the agitator essentially corresponds in structure with the rotatable conveyor 37.

le'lerring particularly to Figs. ll, ll: and 5, it will be obecrved that; the drive shaft which extends entirely through the casing with its axis corresponding with the axis of the inlet opening 13, is formed as mentioned above, in two parts 53" and 28. These two parts are n'elerahly united at a point cult rior to the using and lliUl convenience, may he joined as shown, within journal box 2-2.

One end of the lixed part 27 of the shalt is adapted to threaded engagement with a suitable locking nut within the journal box 25, while its other end is formed with a tongue 27 adapted to lit snugly within an elongated slot or recess 28 formed by the opposing bifurcated end of the part 28 of the shaft, thus ell'ccting a male and female ronneetion between these two parts. The opposing; end of the shaft part 28 is also formed with a chamber or axial bore 28" within which a helical spring 4:0 is housed.

The united ends of parts 27 and 28 of the shaft are enclosed by a threaded and shouldered guide sleeve or collar il, over which one of the bearings is titted to bear against the shoulder tliereon. a suitable nut being screnuul. thereagainst to hold the sleeve in place. Said sleeve is provided with a stout. dian'letri-al pin extended therelhrough. over which the biturcated end of the part 9.8 of the shaft in slipped, (an illustrated in Figs. l and 5), and against which the end oi" the tongue. on the part 52? may bear. "l he spring ll) also bars tennionahly at one and against said pin and at the other end against the end wall ol the chamber or bore 38". lending; to more the part 1353 outwardly from lf()-(,)l)lil'lll.l\'tl connection with the. part 3? ol the. ahal't.

'lhis sprint: permits the rotatable grind inn; plate. ill to yield or move away tron: the opposing stationary plate 35. time aiding their seranation when pressure against. the free end of the part .38 oi the ahai'l in relieved tor the purpose oli withdrawal. and serves also as; a check to prevent the platen ill and 235 from coming into contact when the part 28 is replaced and not to operative position.

The oppoaite cud ol the part ol' lhe bill. which is supported in journal box t.l.iu likewise hi l'uroattul to slidahly lit over a diametrial pin similarly provided in a sleeve ll. (fOlFOFPOIKllHQ; structurally to the sleevev 4-1.. and a bearing 25) fitted thereover in like manner.

An end-bearing -13 is provided in the extended cover or cap of journal box Ql to norovieldingrlv bear againstthe free end of the united drive eha ll toihojld the. two parts ti l in association and prevent outward movement of the part 28 beyond a predetermined point. A hand Wheel n having a threaded shank extending through the cap of the journal box 21 to press against the bearing l3, is provided for laterally adjusting the shaft.

By reference to Fig. 3' it will be observed that the driven shaft 16 is also constructed in two parts, a male and female connection being established therebetween in order that one part may be removed without disturbing the other part.

Instead of the open-ended slot-and-pin connection between the outer end of the shaft section 28 and the sleeve ll whereby they are caused to rotate together, the end of the shaft may be square or polygonal in cross-section and inserted in a correspondingly shaped bore or opening through the sleeve; this modification being shown in Fig.

6 of the drawings, and a similar connection may be provided between the inner ends of the two shaft sections 27 and 2S, respectively, within the sleeve 4:1, to cause the sleewe to rotate with the shaft while permitting a limited longitudinal movement of the section 28, and adapting it to be removed with the removable casing member.

The knock-down operation of my improved mill grinder is effected as follows:

The endless strap 32 is disconnected and pulley 33is removed, together with one part of separable shaft 16. The holding bolts through lugs 11 and 12 on sections 9 and 10, respectively, are next removed and also the base fastening bolts for section 9. The entire section may then be withdrawn from section 10, carrying therewith part 28 of the drive shaft with associated elements, leaving section 10 and associated parts undis turbed. The grinding plates will thus be exposed to view and will be readily acces sible for repair. If desired, the various parts of the-machine which are bolted or otherwise secured to section 9, may be severally disconnected and removed. When it is desired to remove and replace the grinding plates, section 9 is unbolted and drawn far enough from section 10 to permit disengagement of parts 27 and 28 of the shaft and the set screw 31 in pulley 31 is removed so that the pulley may move'freely beyond the extremities of the key-way 28 in the shaft. The part 28 of the shaft, with disk 36and grinding plate 3% may then be drawn out without removing the journal box 21 or associated parts. The machine is re -assembled by a reversal of this operation, the part '28 of the shaft being re-united with its 'cooperating part 27 by revolving the former until its bifurcated end slips over the cross-pin in sleeve 41, whereupon the several casingbolts, pulley with removed part of shaft 16 and endless strap 32 are replaced to render the machine again operable.

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

1. The combination, in an attrition mill, of a casing for the grinder composed of two members, one removably secured to the other and to a supporting base, and each having an open-ended bearing box supported on the outer side thereof, an annular anti-friction bearing in each of said boxes including a sleeve on the grinder shaft rotatable therewith and carrying the rotatable member of the bearing, a third bearing mounted on said base in alinement with the first named bearings, a sectional shaft journaled in said bearings, the section carried by the removablecasing member projecting through the fixed casing member into the bearing box carried my the latter member, and the other section having one end journaled in said third bearing and the other end fitted in the sleeve within the bearing box carried by said fixed casing member, and means on the adjacent ends of said shaft sections within the sleeve thereon whereby both shaft sections and the sleeve are caused to rotate together while permitting a limited longitudinal movement said boxes including a sleeve on the grinder shaft rotatable therewith and carrying the rotatable member of the bearing, athird bearing mounted on said base in alinement with the first named bearings, a sectional shaft journaledin said bearings, the section carried by the. removable casing member projecting through the fixed casing member into the bearing box carried by the latter member, and the other section having one end journaled in said third bearing and the other end fitted in the sleeve within the bearing box carried by said fixed casing member, and means on the adjacent ends of said shaft sections within the sleeve there on whereby both shaft sections and the sleeve arecaused to rotate together while permitting a limited longitudinal movement of the shaft section whichextends through the casing and adapting it to be disconnected and removed with the removable casing 1111 11111111 \1 il'l1o1111 11151111111111: 11111 11111 11 c1111- ing 1111 11111111 111111 11111 11111151 111 511111i111'0d 1 11111 1:- (11:111.

3. The 0111111111111111111 in 1111 11111111011 mill, 01 11 using 1:111 111111 111-1111 11 13 00111111111011 111? two 1111 11111e1a1 one 11 11111111111 111111111111 to 1111 111111 1 111111 to 11 supporline 1111111 1111111 1 :1111 1111111 1; 1111 1.1110111 11111111 1111111111 51. 111; :1111111111-11 11 1111 111e 1111101. side 1111111 111 1111 111111111111 11111i-11icti1111 hem-i11 i11 1 111 11 111? 511111 1111111 1 including: 11 811111111111 1111 11511111101 1 1111111 11 111111 111 1111 11 111111 111111 121111 111 1; 11111 1'11t11t111 11- 1111 111111 1 111 111111 1 11111111." :1. 11111111 1 1 1.111 11111111 1111 1111511111 1111eei11 1111111 1111 1111 1 31111 1111 111st 11111111 11 111. 111 i11 :1 set-1111111111 1. 111111 1 .11111111 111 11 111v 5 11111 111. :11- i11; 1111e 11'e11io11 1:111111 1 111 11111 1.111111111111111 1111 1115: 1111 111111 1 111-1 3 11111 111111111111 1l1e 11211 11 1111111 1 1111 1111 1 1 111111 11111 1111111 111 1111:; 131 11 111111 111' 11111 1111 11 1 1111 111111 1 111111 11111 111111. 1 sce- 11.111111111111 1 one 1 1111 i11111 111le1l 111 911111 1111111 111 1111111 111111 11 .11 111111 1 1 1 .11 .1i11ed 11.1 111111 sleeve 11'i111i11 1.111 111 111111 1; 1111. 1111111 11 1 811111 [1x011 (11511151 1111 111111 1, 111111 i1111 1-e11 .11 11111 1111111119 (111 11111 11111'11ce111 1 111111 111 811111 1 111111 sectiom \vi1l1i11 1111 $11 011: 1111111 1111 11111 11 113 1111111 511111111 Sections :11111 1111 v 1 11 11111 11111 1 1 111 1111 to rotate to ,1;e1111 1 11111111 111111111111151 11 11111111 11 11111git1111i1111l 11111101110111 111. 11111 $111111 section which. extends 1111;011 111 11111 1111111151. 111111 111l1111t 111;); it to 1111 disco1111ec1ed 111111 101110 71 11 11111 11111 removable casing 1111 111111 1 without disturbing the 11311 1 1 1111111115.: 1111 111111 1 111111 11111 111 1'15 11551111 1111'1111 1:11011 l1; 11:1i1l 1111114111122111- 1115). 1111 111111 ccenpiisingf 1111 o1 1c11c11d1 11 $11 1 :11- 11111 1 1111 ot one 11111111 131 1 1111111 11 cross-111 111 said slot 1 :11111 11 11y the sleeve 111111 171111111111 projecting]; 1111111 11 1111111111111 c1111 11 111oo111e1. 5111:111 111 1:1i1111 111111 811111 slot.

-11. '1111 11111111i11:11i1111,i11 11111111111111111 111111.111 11 supporting 11111 11 112111113 11 11111111111 1 11111 11- 11111 111111ci11Q11 1111111115 11 1' 1111 11'1i111l11 1.'11111 11111 011 (.11? two 1111 1111 1113 11111111151 11 1111 1 1111111 11111 11111515 11111 1'c111111'11 11y secured 111 11111 111111 1 111111 to 511111 31111110111119; 11111 11 111111 11111311 11:11- ing 1111 111111114 11111 11 111 11111151 11 1 1 .111 11111111 11 1111 1111 111111 1 $1111) 11111111111 1111. 111111111111- 1 111i- 1'111'111111 111 11111111; in 1 :11:11 111 1111111 111 11 S, 1 :111 11111111111111 11 sleeve 1111 1111 11111111 1 11111111 11'1- 1 11111111111111 1111111 111111 111111, 1:1111yi11;. 1111 1.1111 111111e11'1e11111er111?111111111111111 11 1 c1111111111ls1111113 jo11111111ed 111. s111i11 111 111111; 11111 secfiion 11:11- iied 11 1111 11 111111'111111 11 :-.11; 1111 111 11 1 111-11- 'j(1ii.lll} 111111111111 1111 11111 11 cosine; 1111-1111101 into 11111 111 11111111 11111; 1 :11111 11 111 1111 111111 1. 1111 11111111; 1111 111111 1. 111 1-111111 111111 111; 11111 1 1111. 11111111 in 11111 1 111111 111' 1111 1 111111111 1111111 11 111 said 11.11111 1111- 111;: 11111111111 1, 111111. 1111. 111111 1 1 1111 jo1111111led in 11 hearing: 11111111111111 1111 1 11111. 11111111 in 1111i11e111e111; with 1111 111111; 11111111 11 1111111- 1111111 111111 1111111111 1111 13111.1 111111111 111 1 1111111111 11111 $111111; sections 1 11111111 11110 1 11 1 1111 1111111 1111 11 111 1301111 1111111 51111111: sections 111111 1111 51mm 111e 1111151 11 to 1111 11111 111511 111111. 11111111 permit [111g 1.1 1'1111i1e11 1.1.111gi11111i1111lv 111111'1 1111 111: 111: 11111 $111111; section .1111111. 1131111 111111 111111111 5111. 11111 11111115: 111111 adapting 111 to be disconnected 111111 1e111o1'ed with 111111 1 111110 11l1le 111si11g 1111111111111 11'i1i11o11tdistui'biiig said fixed 011sing: 111e11111e1 111111 the 1111111511 associated 11l1e1.e- 11 1111.

5'1. .111 1111 attrition 111111, two casing 1110111- 1111111 111011111011 011 11 supporting 111150 one fixed 111111 11111 other 11 1110'1'1111111, 11111 lixed 1111111113111 131111 111111; 11. 111111111111 1111111 111111 11111 1111); 11 feed 11111 111111 11111171 111 111111 :1 11111 111 1- 11'111111111 11 1.11e1'e- 1111 111-1111111 11 111111 :1 131111111 arranged. to discl1111;.1e 111111 511111. 11111111111111, 11 hearing supported 1111011 tl1e 11111111: 11111.0 111' 11:11:11 casing 1111 111111 1 :1 51 1:11111111]. 11111111 jo11r11111ed in said 1 1. 1111111.111 one section 11 111 11111? being carried 111' 1 -1111 1.1 11111 1111111 119M111 1111111111111. 1111111 exe1111i11 et1111111el1 11111 111111111111111 11111111111 1 in 11 the 111 11111111; 111111po11'e11 1111 1111111, 11111 other 1111111111 111? 511.111 1. 111111 11111 11111 one end jour- 111111 11 111 11111 1111111111.: 111111111 by 511111 fixed 1111111111 1111111111e1' 111111 11111 other end jo11111111ed 111 11 11111131 111111111111 spaced from the 111st 11111111 11 111 1111115;- 11111 11111 jeceiitends ot the two 110311111115 111 1114 111c111'e11 111111111 11 sleeve 01 11111 111111111151 111111011 11 said fixed casing melnbei 1111 1111 1'11 1111111111 them to rotate together 111111 011111-111 the sleeve 111 1-ot111'e therewith while 1161111111111? 11111 section carried 11y 1111c 1fe- 111111 1111111. casing 1111111111111. to be disconnected 11111.1 11 11101 011 11 111111111 disturbing the fixed casing 1111111113111 111111 the parts associated 1111 170111111.

11. '111111 (11.11111311111111111, in 1111 attrition mill, (1 11 casing 101 11111 111111111111. 1111111111 composed of 11 fixed 1111 11111e1. 111111. 11 1e111ov1111le member arranged side by side 111111 1111111111 :1 feed 111111111 1 111111111ted 111111111111, said 11181110018 1 111111 111111111: 11 9111111, 11111111111; supported 011 11111 1111101 H1110 1'111 10111, 11 t11i1d bearing 111- 11111111111 in 11111101111 111; with the 111111111111 c111? i'ied 11y said fixed 1111 111111 1. 11 sectional $111111 i1111111111ed 1.11 511111 11 111'i11ge, one section being 211111011 11 11111 1e111o11111le casing 1111111111111 111111 projecting 111111111111 11111 111-11111 casing; 111611111111 into 11111 1111111111 1 1 1111111111 1.11 the latter 1110111- 11111, the 0111111 section 1111111111 one end jour- 111111111 111. 81111 1111111 bearing: 111111. 11111 111111 1. 111111 jo1111111le11 111 the 11 1111111,; -1111'i1 11 11y said 111-1011 1111111 1 1111111111111. 11111 11111111' bearing i11- c1111li11 1 11 sleeve 11=itl1i11 111111 11 the adjacent 11111111 111 1111111 5111111; 1101111111111 are slidz111ly se- 11111-1111 so 115 1-11 1211111111 11111111 to 1111'11111 together 111111. 1111 sleeve to 11111511111 11111170111111 while 1 011111111111: :1 li111ited longitudinal 11111101110111 111 11111 11111111; H11c1io11 which. is 1111ic1l by 11111 11 11111111'1111 (111111111 11111111111 1 111111 11110. 1'11111o\'111 1111 1111 1 \1'1111 1. 11111 1e1111111111le casing 111111111101. 111111111111 disturbing 1111111 111111111 casing 1111 111- 11111 111111 the 111111.11 11. 111111511111111 therewith.

T. 31 iflltlcli'dm-Yll 11111111111111 111111 comprising 11 1.111111111111113 111111 11 101110 1111111 11511111 .111e11111e1r enclosing the grinding plates, said casing 111e11111e1-s carrying on the outer sides thereol? 1111111111 shaft bearings, 11 sectional 151111111 111111 111 01111 section. jouioaled in 1.11111 bearings and the other section journa-led in one of said bearings and a third bearing in alinement therewith, the adjacent ends of said shaft sections being connected so that they are caused to rotate together while permitting a limited longitudinal n1ovement of one section independently of the other and adapting the movable shaft section to be removed and replaced with the removable casingmember without disconnecting or disarranging the parts associated therewith or the parts associated with the stationary casing member.

8. A knock-down attrition mill comprising a stationary and a removable casing member enclosing the grinding plates, said casing members carrying on the outer sides thereof alined shaft bearings, a third bearing in alinement with one of said bearings, a sectional shaft journaled in said bearings, one section being carried by the removable casing member, in-s terengaging means on the adjacent ends of the sections whereby they are caused to rotate together while permitting a limited longitudinal movement of one section to disconnect it from the other section and permit its removal with said removable casing member, a second sectional shaft journaled in bearings mounted on said casing, one section being removable with said removable casing member, a hopper having a down spout or conduit leading into an opening in the stationary grinding plate, a rotary feeding and stirring device on each sectional shaft, one arranged within the opening through the stationary grinding plate and the other within the feed hopper, and a driving connection between the two shafts.

9. In an attrition mill having a base and grinder-plate housing, a sectional grinder actuating shaft journaled in bearings supported on said base and housing, the inner ends of the two shaft sect-ions being fitted in a sleeve forming a part of one of said bearings, said sleeve having a cross-pin therein and oneend of one shaft section within said sleeve having a tenon thereon in alinement with said pin, the adjacent end of the other shaft section having an oblong open-ended slot therein slidably fitted on said pin and tenon, thereby causing the sleeve and the two shaft sections to rotate together for actuating the grinder while permitting a limited longitudinal movement of the shaft section having the slotted end and adapting it to be adjusted longitudinally and disconnected from the other shaft section and the sleeve without removing a bolt or screw.

10. In a knock-down grinding mill, having grinder-plates and a housing therefor, a revoluble grinder actuating sectional shaft, adjacent ends thereof having a slot and tongue connection, and a coupling sleeve enclosing the united ends of the shaft, having a cross-pin therethrough adapted to fit within the slot of one of the sections, and alined with the connecting tongue on the adja cent section against which the latter may non-yieldingly press.

11. In a knock-down grinding mill, having grinder-plates and a housing therefor, a revoluble grinder actuating sectional shaft, one end of one section thereof being bifurcated and the adjacent end of the other section having a tongue adapted to fit therebetween, a coupling sleeve enclosing the united sectional ends of the shaft having a cross-pin therethrough adapted to fit transversely within the bifurcated end of one section adjacent to and parallel with the free end of the tongue on the other section against which the latter may nonyieldingly press.

12. Ina knock-down grinding mill, having grinder-plates and a housing therefor, a revoluble grinder actuating sectional shaft, one end of one section thereof. having an axial chamber and an elongated bifurcation formed therein, andthe adjacent end of the other section having a tongue adapted to engage with said bifurcated end, a coupling sleeve enclosing the united sectional ends of the shaft having a cross-pin therethrough adapted to fit transversely within the bifurcated end of one section adjacent to and parallel with the free end of the tongue on the other section, and a spring housed within the axial chamber in the first mentioned section adapted to press against the cross-pin in said sleeve and tending to force the two sections apart.

In testimony whereof I affix my signature.

SIMON SNYDER.

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