US111397A - Improvement in bark-mills - Google Patents

Description

lanni ditta.

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rnnnnnrok stanti, or EAST Lnnrnrnn, PENNSYLVANIA.

Letters Patent No. 111,897, dated January 31, 1871.

IMPROVEMENT IN HARK-MILLS.

The Schedule referred to in these Letters Patent and making part of the same. I

annular head, forming a bearing for the shaft of the` ruimer and crushers independent-ly of the peculiar and vnovel breaker keyed to Athe shaft, together with the Y central (lished step, with beveled sides, to receive the tapered gud'geon o f therunner, which is adjustable verticallyand laterally. to centralize the runner;

also, th'e construction of the crushing and grinding teeth.

Figure l represents a vertical section ofthe shell, runner, crushing, and grinding-teetl1,'and breaker at Figure 2 shows a perspective view of the shell with its central arms.

Figure4 3 `is a perspective view ofthe conical runner with its tecth.- v

Figure 4 represents the eross-bars constituting the adjustable step.

Figure 5 shows the angles o f -the cutting edges of the lower teeth on the shell and runner.

Toeuable others skilled in the art to make and use my invention, I will proceed to describe it' as follows:

The-object oi' my invention is the perfect adjustnient of themill, so that the breaking, crushing, and grinding operation is regular, preventi'ngthe escape of coarse pieces of bark, or the clogging or gulnming of the mill. v i j The shellv A is provided with lugs B B above, perforated for attaching ahopper, also sim-ilarlngs C O below, to secure the niill to a proper framework at four sides, 'and intermediate with the lugs O are four lugs D ID, with holes to receive the stern `of the adjustingy belts,A E E, that are secured by pairs of jam-nuts to theuprightanged ends G Gr ot the cross-bars H H. In the center ofthe arms H is the dished step N.

The four armsI I, shown, are a part of the shell, and are provided with triangular teeth J J, set iuclined on the lowerl sides ofthe arms, so as to besparallel with the conical side of the runner K, Athe shaft L of which has its bearingin. the union P. p

This runner K is of the usual conical t'orrn above, but is provided with a series of about nine rows of teethM M. These teeth `have a vertical triangular face and a triangular base, so arranged, somewhat spirally, that each succeeding tooth is slightlyin advance of the other, in order to bring them into action in quick'succession.

` The base of the cone is slightly tapered downward from the cone, and is provided with a series of grad- `vuatcd oblique grinding-teeth N N, the shortest starting from the edge of theybasc, and inclined, say, at an angle of thirty degrees, so thatthe front andlongest tooth is in the leadfaud extends -upward onto the cone.

In afull-sized machine the cut-ting edges of these lower teeth N are beveled forabout the distance of an inch vertically, and parallel to and in close connec- 'tion with 'the lower ends ot' the grinding-teeth It, on

the inner surface ofthe shell, as shown at ng. 5.

Above the grinding-teeth of tbe lower series ot' teeth are crushers S S, on the shell.

The breaker T is keyed to and revolves with the shaft Il over the iixed and stationary, arms I, and the cutting-edge sections of the breaker 'l operate shearfashion, andpreparc the bark for the crushing action of the teeth J and M, on thc lower sides of arms I,

and upper side'of runner K, and crushers S of the shell A, successively reducing the' bark for the inal action of ,the grinding-teeth N and R to the quality desired.

The edges of the lower grinding-teeth N and R project out-ward at their tops, and are tapered to with in an inchof their lower ends, where'they are beveled parallel to each other, as shown at fig. 5,' for the purposeof more thoroughlyand easily grinding the bark, while the difference ofthe angles of the cuttingedges of the teeth and the spaces Y Y, between each one ofthe grinding-teeth, allows those portions of the bark, sufficiently reduced, topass through without being retained and unduly pulverized, and effectually.

prevents tho clogging or gumming of the mill, as is i' the case in the ordinary arrangement of teeth closc together, and enables the mill tno be closely adjusted to prevent the escape ofcourse pieces of bark.

The cross-arms H, with their central-closed step N, shown at iigs.,4 and l, have their four ends turned up vertically', then horizontally, at right angles G, with square holes, and side lugs V perforated with a female screw for the lateral adjustment to centr-alize the runner K with 4its gudgeon W, that is slightly tapering at its base, to adjust itself, in wear, with the inclined sides of the step N. i

The square-headed adjusting-screws X X'are held by jam-nuts, and the screws are operatedagainst the outside oi' thc shell A Jto'produce the central adjustment. f

@he step is vertically adjusted by the suspending bolts E E. By this twofold adjust-ment the teeth N, all constructed and arranged as shown and described, for the purpose set forth.

ofthe runner and those of the'shell are completely prevented from scntching or grinding each other.

Other advantages of my invention are the stepboX 1ST in the cross-bar II, and the mode of adj ustingA laterally; also, the crushing-arms I, four, more or less, as connected solid with the shell A, are so strong and centrally united as to be arfirr'n support to pre-y ser've the vertical position of the shaft L. v

`The manner of arranging the .teeth S and R on the shell, as shown at fig. 2,-and lthe graduated and angular teeth M and N on the runner K, and the beveledged and toothed-breaker C operating in conjunction with the inclined and toothed-arms I, producing a regular, unfailing, breaking, crushing, and grinding result.

What I claim as my invention, and desire to secure by Letters Iater '5, is--'4 1. The conical runner K, provided with the triangular teeth M, and graduated tapering grinding-teeth 2. The shell A, providedy with the tangential graduated teeth S, radial tapering teeth It, and arms I, provided with teeth J, all constructed and arranged as'shown, for the purposes described.

Y 3. v The combination and arrangement of thevshell A and'runner K, constructed as described, with the Ybreaker T, provided with shear-teeth t, and the crossbars H, all constructed substantially as'shown and described, forrthe purposes herein set forth.

i. The cross-bars H, with their ends G and lug V, and adjusting screws E and X, for adjusting the runner K vertically and laterally, as herein described;

5. The construction of the breaker T, attached to the shaft L, as herein described, and for the purpose set forth.

-Viitnesses' J. FRANKLIN REIUART, J AMES Onoss.

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