US240282A - Grinding-mill - Google Patents

Description

(No Moden) I J. STEVENS.

Grinding Mill.

NO. 240,282. patenlid April 19,1881..

o 'o e' "mll" Wi il l N'PEI'ERS. PHOTD-UTHOGHFnE-R, WASHINGTON, D (DA UNITED STATES PATENT OFFICE.

JOHN STEVENS, OF NEENAH, WISCONSIN.

GRlNDlNG-IVHLL.

SPECIFICATION forming part of Letters Patent No. 240,282, dated April 19, 1881.

Application tiled December 3, 1880. (No model.)

To all whom it may concern:

Be it known that I, J ORN STEVENS, of Neenah, in the county of Winnebago and State ot' Wisconsin, have invented certain new and useful Improvements in Grinding- Mills, of

which the following is a specification.

1n Letters Patent of theUnited States granted to me on the 3d day ot' August, 1880, and numbered 230,834, l havedescribedand claimed adjusting mechanism applied to the sliding bearings of a yielding concave or roller, so constructed and operating that while the bearings are permitted to yield away from the bearings of the converse grinding-surface against springpressure, the absolute limit of their retreat therefrom or of their advance thereto ward may be varied at will.

My present invention relates to improvements in the adjusting mechanism described in said Letters Patent 5l and it consists in shortening the central screws therein recited, so that they screw into, but do not pass through, the movable blocks, and in providing the spindle of each of said screws with a fixed collar, which comes against the outer end of the corresponding hollow screw and forms a stop to the inward movement ot' the block.

In the drawings, Figure 1 is a plan view of a roller-mill embodying my invention. Fig. 2 is a side elevation, partly in section, to show the operation of the device; Fig. 3, a section transversely through one of the sliding blocks, on the line w :l: of Fig. 2, and Fig. 4 a modification.

Supported upon a strong frame, A, of any approved construction for the purpose, are stationary blocks a, which form bearings for the roller B, and other sliding blocks, c, which receive the gudgeons of the yielding roller C. By means of gearing, such as is usual in this class of machines, the rollers are caused to revolve either toward or away from each other, and at such relative surface-speeds as may be necessary or desirable.

The hollow adjusting-screws E (described in my aforesaid patent) pass through the exterior frame-work, or through lugs d projecting therefrom, so that their inner ends may come into the path of the yielding blocks and posi- 5o tively stop the retreat of the latter at a point determined by the adjustment of said screws.

Encircling these screws are the coiled springs e, bearing at one end against the blocks, andv pressing them and the roll which they carry inward toward the opposite roll, and at the other end seated against adjustable nuts'e upon the screws, whereby their stress may be increased or decreased whenever desirable. Through the hollow screws pass the smooth spindles of long screws F, which, at their outer ends, are provided with a hand piece or wheel, whereby they can be readily turned, and at their inner ends are threaded into sockets in the sliding blocks, the depth of said sockets being sufficient to allow a proper range of adjustment.

Fast to the spindles of the long` screws, in such position as to bear against the head or outer end of the hollow screws as the blocks are pressed in by the spring, are collars or stops f, which limit the inward movement ofthe long screws, but afford no obstacle to their outward movement when the blocks are, from any reason, caused to yield.

With this construction it is evident that the limit to which the yielding roller can approach the other, or the normal distance between the grinding-surfaces, will be determined by the distance between the sliding blocks and the collars f on the long screws, and that adjustments of this limit will be made by taking up or letting out the blocks by mea-ns of said screws, so that the collars may stop the roll farther from or nearer to the other.

As a modification the hollow screws may be omitted and the collar upon the long screw arranged to come directly in contact with the exterior of the lug d, as in Fig. 4. The coiled springs in this case will directly encircle the long screw, and may either extend from the lug to the block, in which event they will be only incidentally adjustable in stress, or may be stopped short of the blocks by a nut, e2, on the screw. The latter arrangement is prefera ble, since it permits the stress of the spring to be adjusted independent of the adjustment of the screw, and to remain constant, notwithstanding the taking up or letting out of the blocks.

To prevent the rolls from being jammed hard against each other by carelessness on the part of the attendant in changing the adjustment,

IOO

I provide guard-screws G, which are threaded through the stationary blocks and can be set to positively stop the approach of the sliding blocks and the roll mounted therein at any desired distance from the other roll. These will limit the range within which adjustments can be made by the attendant by means ofthe devices at the front of the machine, while permitting entire freedom ot' adjustment within that range.

A concave may be mounted in the sliding blocks and controlled, as to its horizontal adjustment, by the devices above described, as will be understood by reference to my former Letters Patent, hereinbefore mentioned and I consider such an application as within the principle of my invention.

I claiml. The combination ofthe sliding blocks, the screws passing through lugs on the frame and threaded into such blocks, the collars or stops fast upon the spindles of said screws exterior to the lugs, and the springs which press the slidin g blocks and the mecha-n ism carried thereby toward the converse mechanism.

2. lhecolnbinaton of the sliding blocks, the screws passing through lugs on the frame and threaded into such blocks, the collars or stops upon the spindles ofthe screws exterior to the lugs, and theadjustable sprin gs encircling said screws and pressing the sliding blocks and the mechanism carried thereby toward the converse mechanism.

3. The combination of theslidingblocks,the hollow screws threaded into lugs on the frame andV serving as stops tolimit the retreat of said blocks, the long screws passing through said hollow screws and threaded into the sliding blocks, the collars or stops upon the spindles of the long screws, arranged to come in contact with the heads of the hollow screws, and springs pressing the sliding blocks and the roll or concave carried thereby toward the converse grinding-surface.

4. The combination of the sliding blocks, the hollow screws threaded into lugs on the frame and servin g as stops to limit the retreat ot' said blocks, the long screws passing through the hollow screws and threaded into the sliding blocks, the collars or stops upon the spindle of 5ov the long screws, arranged to come in contact with the heads of the hollow screws, springs encircling said screws and pressing the sliding blocks and the mechanism carried thereby toward the converse mechanism, and nuts for adjusting the stress of'the springs.

5. The combination, with the spring-pressed sliding blocks, and with thc screws by which the limit ot' their advance is adjustably determined, ot' guard-screws threaded into and passing through the stationary blocks, to limit the range of such adjustment.

6. lhe combination, with the spring-pressed sliding blocks, and with the screws by which the limits of their advance and vretreat are adjustably determined, ol' the guard screws threaded into and passing through the stationary blocks to limit the range within which said adjustments may be made, for the purpose speci tied'.

JOHN STEVENS.

Witnesses:

JOHN R. DAVIS, Jr., JOSEPH G. PARKINsoN.

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