US269623A - Roller grinding-mill - Google Patents

Description

(No Model.) H. BVIRKHOLZ. 2 Sheets-Sheet I'.

v ROLLER GRINDING MILL. No. 269,623. Patented Deo. 26, 1882.

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(No Model.) El BIRKHOLZI 2 sheets-sheet 2.

ROLLER @BINDING MILL.

No. 269,623. Patented Dec. 26, 1882.

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i HANS BIRKHOLZ, OF RACINE, WISCONSIN.

ROLLER GRINDING=IV|ILL.. Y

SPECIFICATION forming' part of Letters Patent No. 269,623, dated December 26, 1982. i Y Application filed May 3, 1882. (No model.)

To all whom it muy concern Be it known that I, HANS BIRKHOLZ, formerly a subject ot' the Emperor' of Germany, having tiled a declaration of intention to become a cltizen of the United States, residing at Racine, in the county ot' Racine and State ot' Wisconsin, have invented certain new and useful Improvements in Roller Grinding-Mills; and I do hereby declare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to makeand use the same.

.Lnis invention relates to roller grin-dingmills in general, though some features thereof were designed more especially with a view of improving portable roller grinding-mills in which the grinding-rollers are so mounted that one gravitates, and, in operation, has a tendency to crowd toward the other-a mill, for

instance, such as described in United States Letters Patent No. 255,715.

The object of my improvement is to combfne the spring` which regulates the pressure ofthe movable roller toward the ixed roller with the rod for gaging the space between the rollers in such a manner that the gage-rod may be adjusted without affecting the tension of the spring, and that, on the other hand, the tension ofthe spring may be changed without disturbing the adjustment ofthe gage-rod.

In order that my invention may be clearly understood, I have illustrated in the annexed drawings, and will proceed to describe, the best form thereof when applied to a portable roller grinding-mill ofthe above-stated character at present known to me.

Figure l is a partly-sectionized side elevation of such roller grinding-mill embodying my improvements. Fig. 2 is a partly-sectionized front elevation ofthe same, the gage-rod being omitted, as well as the hand-lever for ad.

on the cheek-plates c c, formed on the upper end of the column or standard (i of the mill. The movable roller l) is journaled in similar journal-boxes fitted in hollow bosses or guides on the divided casing E, which is pivoted or hinged on a bolt, c, between the cheek-plates of the standard C, so that the rollers will be entirely inclosed in such casing. The holesin the sides of the casing through which thejournals of roller A pass must be somewhat elongated in the direction ofthe swing ofthe casing, so that the lat ter may swing to a limited eX- 'tent withoutbeingobstructed by such journals.

The movable roller is prevented from running in immediate contact with the fixed roller, and the normal space between the rollers is determined by the gage-rod F, which engages a circular nut., F', fitted in a circular recess or hole in standard C, and passes through the lower end ofthe casing, being provided with a collar,f, for limiting the approach of the cas ing to the standard. The nut F is capable of turning or swiveling in its seat in the standard, so. as to be able to accommodate itself to changes in the position ofthe gage-rod,due to the movement of the casing and its roller. The holes in the standard and the adjacent rear side of the casing through which the gage-rod passes are vertically elongated to provide for free motion of the movable parts.

At the front side of the casing the gage-rod passes through a box, C2, formed thereon, and is encircled by a. stout spiral spring, Gr, bearing with one end against 'the bottom of said box and with the other end against a cap, Gr", slipped on the gage-rod, and pro vided with lugs g g', which enter longitudinal grooves g g in the shell of the box, so that the cap but cannot turn in the box.

In order that the gage-rod may be turned in its nut F to gage the space between the rollers, it is provided with a crossbar or handlever, H, fitted on'it next to the' cap G', the

may slide i gage-rod being in this instance attenedon one side, to so engage the correspondinglyformed eye ofthe hand-lever that the latter mayl slide on it. Interlocking recesses and projections are formed respectively on the adjoining faces of the cap G and hand-lever H, so that the latter can be turned only on the applica- IOC tion of considerable force to it, or after the cap has been first disconnected from it, according as the interlocking recesses and projections are rounded or square-cornered.

The outer flattened etid of the gage-rod is screw-threaded atid carries a nut, I, constructed with a hand-wheel for turning it with facility. By adjusting this iitit I the tension of spring Fr cati be regulated witliont changing the adjustment of the gage-rod.

The journal-boxes of the rollers are accurately tted at top and bottom in their guides, but have consider-a1 lateral play therein. Each journal-box is provided at the center ot' the side facing the bite of the rollers with a shallow recess, in which is seated an elastic cushion, J, of rubber or wood, made long enough to protrude a little from the recess in the box. A set-screw, K, bears on the opposite side ot' the box, being fitted in a screw-threaded hole in the side ot the supporting-guide otl the box.

\Vhen the box has been properly adj usted the elastic cushion will be somewhat compressed,

bearing with considerable friction against the guide, which, together with the frictioual press uic of the set-screw on the opposite side, will hold the boX so tirnily as to prevent it from moving endwise in its supporting-guide, allowing it, however, to accommodate itselfl t0 slight inaccuracies of alignment. By proper adjustments of the set-screws K the required parallelism ofthe rolls may be easily obtained, and lost mot-ion, due to tlte wear of the boxes and journals, may also be readily taken up.

'Ihe casing E is at the top constructed with a funnel, E, upon which a hopper, L, is to be superimposed. The feed troin the futitiel t0 the rollers is governed by a feed-slide, M, as usual. The feed-slide is arranged to slide in guides on one side ot' the funnel. Toits upper end is pivoted a rod, N, which extends from the slide at an acute angle of about forty-,five

degrees, more or less, across and through the opposite side of the futinel, its outerend beingr screw-threaded and entering a nut, N', which is swivelingly connected tothe tunnel, as clearly shown in Fig. 1. This arrangement ofthe feed-slide and its adjusting rod and nut relatively to one another causes a reciprocal locking of each by the other. so that no jam-nut or other supplementary lockiugdevice is required for preventing the shifting ofthe feed-slide by the vibrations ofthe mill.

Iti inills having a stationary casing the gage rod and its adjuncts would be applied to the frame or yoke carrying the movable roller.

I do not herein claini the feed-slide arrange ment shown and described, but reserve the. right to claim it iu a separate patent.

Havingthusdescrihed my invention, what I claim as new isl. Thel combination, substantially as before set forth, ofthe txed roller-supporting standard, the movable roller-carrying easing pivoted thereto, the adjustable gage-rod, the unt thereof, held by the standard7 and the spring connected with said rod and adjustablein tension independently thereof.

2. The combination, substantially as before set forth, ofthe fixed roller-supporting standard, the tiiov'able roller-carrying casing pivoted thereto, the adjustable gage-rod, the swiveling iiutthereot', held by the standard, the spring, the sliding cap, the hand-lever for rotating the gage-rod, detachably locked to the sliding cap, and the nut for adjusting the tension of the spring.

In testimony whereof I aflix my signature in presence of two witnesses.

HANS BIH'KHOLZ.

Witnesses:

CHARLES H. Liin, Guo. L. EDDY.

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