US423704A - Grinding-mill - Google Patents

Description

0. SIMPSON. GRINDING MILL (No Model.)

No. 423,704. Patented Mar. 18, 1890.

mlllllllllllllllllllll llllll Z L Z UNITED STATES PATENT OFFICE.

ORVILLE SIMPSON, OF COLLEGE HILL, OHIO.

GRINDING-MILL.

SPECIFICATION forming part of Letters Iatent No. 423,704, dated March 18, 1890.

Application filed October 21.1889.

To all whom it may concern.-

Be it known that I, ORVILLE SIMPSON, a citizen of the United States, residing at Ool lege Hill, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Grinding-lvlills, of which the following is a specification.

' .My invention relates to the class of grinding-mills in which the operating burrs or stones are mounted one above the other within a suitable frame, the running-burr being mounted on a vertical spindle, which is supported by a-bridge tree and pivotal lighterbar and provided with regulating devices whereby the said stones may be run a greater or less distance apart, as desired; and my invention consists in the construction and arrangement of safety devices, all as hereinafter fully described, and particularly pointed out in the claims.

In the accompanying drawings, Figure l is a central sectional elevation of a grindingmill with my presentimprovements (described and claimed herein) applied thereto, the curb or casing usually around the burrs being omitted; Fig. 2, a vertical section, partly. in elevation ,of my improvements complete, showing the bridge-tree and lighter-bar broken oif Fig. 3, a transverse sectional elevation on line as 00, Fig. 2; and Fig. 4., a broken longitudinal elevation of the lighter-bar, showing its outer or free end, which engages my improved dev1ce.

v A represents the uprights, and A the connectingirders or cross-beams, which together form the usual frame of an ordinary grinding-mill.

B represents the upper or stationary'burr, and O the lower or running burr, of the mill shown in the drawings. Both said burrs may be supported andincasedin any desirable manner, the lower or running one being suit-ably mounted upon and connected with a tapered spindle or upright shaft D, so as to revolve therewith, and said shaft being properly journaled at its upper and lowerends, as custom. ary or desired. 7

a a, are the customary bevel driviug gears, the driven one a being keyed to spindle D, and the driver a to the horizontal shaft b.

E represents the bridge tree, supported at. its ends by the girders A and F the lighter a No. 327,629. (No model.)

ing pivotally connected at one end to the bottom thereof. The said horizontal shaft 1) is journaled in the lighter-bar intermediate the ends of the latter, as clearly shown in Fig. 1 and as usual. I

G represents a hollow post or stand-pipe mounted upon one end of the bridge-tree, andc the usual regulating screw or rod for the adjustment of the running-stone. Saidregulating-screw passes upward through an aperture or slot G in the bridgetree and the hollow of said post to receive a hand-wheel or Y 1 bar located directly under the bridge-tree, be!

nut d on its upper screw-threaded'end, and

also an elasticrubber cushion or spring e,-

which latter fits loosely upon said screw intermediate the central hub of said hand-Wheel and the top of said post.

c is a loop or stirrupformed at thelower end of the regulating-screw o, and a represents the lower cross-baror ligament of said stirrup, upon which the outer or free end of the lighter-bar has heretofore rested for support at all times, both while the burrs were running close together and thrown apart.

f is a notch in the lower edge of the said outer end of the lighter-bar.

H represents a transverse j frangible pin, whose ends fit Within suitable openings made in the enlarged portions h of the vertical sides of stirrup c, slightly above the said crosspiece 0', and provided to support the notched free end of the lighter-bar, in the manner and for the express purpose immediately hereinafter described. The pinH is an auxiliary one in connection with said cross-piece c, and is preferably made of wood of sufficient strength to normally-bear theweight of the parts supported by the lighter-bar and to withstand the resistance or strain incident to the ordinary grinding of the mill on grain, but which immediately yields or breaks on the entrance of any hard foreign matter-such as stones, bolts, nuts, or the like-between the burrs, thereby causing therunningstone to continue to rotate a suitable distance apart from its companion burr to permit the said foreign matter to escape or be removed from between said burrs, thus preventing any further material injury to the grinding surfaces of either of said burrs.

In. the operation of my device the free end of the lighter-bar drops instantly on the rupt-- ure of the auxiliary pin Hand is at once caught by the cross-piece c" of the stirrups 0', its notch f engaging said cr0sspiece in the usual manner. The mill may continue to grind after the breaking of pin H by merely turning the hand-wheel to raise the regulating-screw and the lighter-bar,with the grinding devices, to theirformer positions, and the rubber cushion or spring 6, above described, used to operate singly in connection with the burrs and permit them to part sufficiently for the escape of any foreign matter should an unusual'strain, caused by any such resistless foreign matter, accidentally enter between them.

It is obvious that both the wood en-pin and elastic spring-cushion e can be used together in connection with the grindingdevices, as

pivotal lighter-bar, vertical spindle, burrs f and O, regulating-screw c, hand-wheel 01-} I101- ,low post or cylinderG,:l-oop or stirrup c at 1 lower end of said regulatingescrew, transverse bar a" of said stirrup, break-pin H, mounted in said stirrup slightly above said. transversebar 0", and" cushion or springs, mounted'on' the upper end of saidregu'lating-screwf interj mediate the top of said hollow-post andhandwheel, substantially as and for the purpose herein shown and described, or they may be used orapplied separately, as desired; but the former-combination I deem the better,.forthe reason thatshould the pin break the mill need not necessarily be stopped to renew said pin, but it may go on grinding and the hand-wheel beturned so as to bring the running-burrinto work-ingposition, the said elastic cushion their presenting a sufficiently yielding bearing or support to permit the escape of foreig-nmatter should any enter between the" burrs, aszpreviously stated herein. It isialso" obvious that; instead of using a rubber cushion on the regulating-screw,ias shown, a, spira'l spring could be substituted and the device operate quite aswell;

I claim 1. In ag-rinding-rnill, the combination, with E the pivotal lighter-bar, vertical spindle, burrs B and O, and vertical regulating-screw c, the

latter being passed upward through a cylinder or hollow post G and engaged by an adjusting hand-wheel d on its upper threaded end, of a transverse break-pinH, mounted in the stirrup or loop c'at the lower end of said regulating-screw, and cross bar a", forming in the manner and for the purpose specified. 2. The regulating screw or rod 0, having at its lower end aloop or stirrup c, cross-bar c", a forming the bottom of said stirrup, and transverse break-pin H, mounted in said stirrup bar, substantially as and for the" purpose specified.

3. In a grinding-mill, thev combination of a In testimony'of which invention I' h'av'e here Witnesses:

JOHN E. J ONES, FRANK L. MILLWARD;

45 thebottom of said stirrup, constructed, ar-

ranged, and adapted to operate substantially *parallel with and slightly above said cross-

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