US107353A

US107353A - Improvement in grinding-mills

Info

Publication number: US107353A
Authority: US
Publication date: 1870-09-13
Anticipated expiration: 1887-09-13

Description

J. A. PORSMAN] .Flolir Mill.

No. 107,353. Patent-ed Sept, 13,1870.

MPETERS, PNOTO-LITHOGRIPHER, WASHINGTON, I?!v G.

UNITED STATES PATENT OFFICE.

JOSEPH A. FORSMAN', OF CHICAGO, ILLINOIS.

IMPROVEMENT IN GRINDING-MILLS.

Specification forming part of Letters PatentNo. 107,353, dated September 13, 1870.

To all whom it may concern.- Be it known that I, JOSEPH A. FORSMAN, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Grinding-Mills; and I do declare that the following is a true and accurate description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, and being apart of this specification, of which Figure 1 is a sectional perspective of the runner-stone from the rear side, showing the improved method of securing the back plate and spindle thereto. Fig. 2 is a perspective of the face side of the stationary stone, showing my improved method of securing the same in the case. Fig. 3 is an axial section of the last figure.

Like letters indicatelike parts in each figure. The nature of this invention relates to an improvement in the construction of grindingmills; and it consists, first, in an improved method of securing the back plate, spindle, and driving-pulley to the runner-stone,whereby the same are more effectually secured in place and the bursting of the stone prevented from the causes inherent in such mills as heretofore constructed 5 second, in an improved method of securing the stationary stone in the curb or case by the interposition of screwclamps between the adjusting-screws in the curb and hoop of the stone, the hook-points of said clamps engaging with the hoop or the stone, with their screw ends projecting through the back of the case, where they are provided with proper nuts, by means of which the stone is held in tram, the whole being more particularly designed as an improvement on the grinding-mill for which Letters Patent were issued to me on the 3d day of November, 1863.

In the drawings, A represents the runnerstone of my mill, having the iron hoop B shrunk on its periphery, but overhanging the back edge, as shown. C is a back plate or disk, having on its periphery a series of projections, a. O is the driving-pulley, andD the spindle, all of which may be cast in one piece or in separate parts, the whole being properly secured together in any convenient manner. The disk 0 is laid against the back of the stone within the flange formed by the projecting edge of the hoop B. It will be noticed that theedges of the projections to are depressed from their corners toward the -center on the outer face. The back plate is secured to the stone by riveting or peening the hoop B into the depressions formed in the. projections a.

The above-described method of securingthe parts together obviates all tendency to burst is the rear band or hoop shrunk on its periphery.

G are screw clamps or hooks projecting through the back'face of the case, where they are provided with proper nuts G. The hook ends of the clamps engage with the edge of the hoop b. g

H are the tram-screws passing through the back of the case, and passing against the back of the stone.

I are the adjusting-screws, each of which passes through the periphery of the'case and exerts its pressure on the back of the screwclamps G. I

The object I havein the employment of the hooks G is to hold the stationary stone in place back against the tram-screws, the setscrews I serving to keep the hooks in engagement with the band of the stone, as well as to prevent the stone from being moved out of place in the case.

The spaces between the projections a of the disk or back plate, 0, are designed to be used in balancing the stone by filling such of them with lead or other material as may be neces sary to accomplish that end. I do not intend, however, to confine myself to the use of these spaces for that purpose, as the disk may be made solid and other methods of balancing employed.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The arrangement of the runner-stone A, the hoop B, the back plate, 0, the projections a, the driving-pulley G, and the spindle D, when constructed as described and shown,

and as and for the purposes set forth.

2. The arrangement'of the stationary stone F, the case E, the edge b, the screw-clamps G, the nuts G, the tram-screws H, and the set-screws I, when constructed as described and shown, and as and for the purposes set forth. 7

JOSEPH A. FORSMAN...

Witnesses:

FREDERICK EBERTS, HARRY S. SPRAGUE.