US28518A - Babk-mill - Google Patents

Description

W. TANSLEY.

Bark M'ill.

Patented May 29, 1860.

UNITED STATES PATENT OFFICE.

WILLIAM TANSLEY, OF SALISBURY CENTER, NEW YORK.

BARK-MILL.

Specification of Letters Patent No. 28,518, dated May 29, 1860.

To all whom it may concern:

Be it known that I, TVILLIAM TANSLEY, of Salisbury Center, in the county of Her-kimer and State of New York, have invented a new and Improved Machine for Breaking and Grinding Bark Designed Chiefly for Tanning Purposes; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure 1, is a vertical central section of my invention taken in the line 00, m, Fig. 2. Fig. 2 a plan or top view of the same.

Similar letters of reference indicate corre sponding parts in the two figures.

The object of this invention is to obtain a grinding mill by which damp or wet bark may be ground with facility and in a perfect manner. There are many forms of bark mills which will grind expeditiously and well dry bark, but which will when fed with wet or damp bark become choked and clogged causing much trouble and delay besides working very inefiiciently.

I propose to obviate this difliculty by employing rotary burs and stationary graters arranged in a novel way and also in using in connection therewith breakers arranged to operate conjointly with the burs and graters to'effect the desired result.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A, represents a conical cast-metal case of suitable dimensions having arms a, a, within it and crossing each other at right angles, similar arms 6, 6, being attached to the bottom of the case A.

B is a vertical shaft which is placed centrally in the case and has its bearings at the points of intersections of the arms a, a, Z), Z), as shown clearly in Fig. 1.

To the upper end of the shaft B, there are two breakers c, 0, attached. These breakers are simply two arms of slightly curved form provided at their outer end with a pendent toot-h (Z, as shown clearly in Fig. 1.

On the shaft B, below the arms a, a, there is placed a conical head C, and the upper end of this head has four radial arms 0, attached to the outer ends of which is secured a rim D. This rim D, transversely is of inverted V form, as shown clearly in Fig. 1, and it is provided at each side with teeth or burs d, every alternate one 1 of which extends from the bottom to the top of the rim, and the intermediate ones 2, extending upward to a point about half the height of the rim as shown in both figures.

The base of the rim D, is a perfect circle, both of its sides, however, vary from this form. It may be described as having its sides formed of eccentric sections which gradually increase in width from one end to the other, the thick or broad end of one section adjoining the thin end of the one next to it as clearly shown at a in Fig. 2. The rim D, is represented in Fig. 2, as being divided into four eccentric sections but more or less may be used as described.

The conical head C, has a circular base, but its sides are also divided into eccentric sections similar to the rim D, and are provided with inclined teeth or burs 6, arranged precisely the same as the teeth or burs on the rim D, viz., every alternate tooth 3 extending the whole height of the cone and the intermediate ones 1, about one half of its height see Fig. 1.

The upper sides of the arms 0 are provided with teeth 7, of pyramidal form, and the under sides of the arms a, are provided with similar teeth 9, the latter being in line with the spaces between the former as shown clearly in Fig. 1.

To the upper surfaces of the arms Z), 6,

there is attached an annular grater E, the

base of which is a perfect circle but the sides are composed of alternate concave and convex sections b", c, as shown clearly in Fig. 2. The grater E, it will be seen by referring to Fig. 2, occupies a position between the conical head C, and the rim D. The grater is provided with teeth at its sides all of which extend its whole height.

At the lower part of the case A, at its inner side there is a toothed rim F. This rim is also composed of eccentric toothed sections precisely similar to the conical head C, and the rim D, the lower edge of the rim F, forming a perfect circle.

The conical head C, and rims D, and F, have their eccentric sections so formed, that they gradually lose their eccentricity, or gradually approach to a circle from their upper to their lower edges, the greatest eccentricity being at the top. The same also may be said respecting the sections of the grater E.

To the inner side of the case A, there are four projections Gr, placed at equal distances apart and cast with the case A. The

rim F, is also cast with-the-case A; All

the parts of the mill with the exception'of" the'shaft B, may be of casts-iron. i The operation is as follows: The shaft is rotated by any convenient power and the bark is put into the case A, the breakers'c, as they rotate, reducing it to a certain extent so that it may pass down in the case and be still further a'ctedflu'pon by the teeth f, g, of the arms a, a, the latter rotating with the shaft B, The bark is then reduced sufficiently fine to passdown between the conical head G, and grater E, and between the grater and rim D, and between the rims'D,

andFQthe bark bein discharged from between them in a sufficiently ground state. The forming of the grinding parts above named of eccentric sections as herein described, prevents the bark from packing between the grinding surfaces. This eifect is due to an irregular action of the grinding surfaces on the bark produced by their ec-' leaving the upper parts of the spaces between' the grindingv parts more open" than they otherwise would be and at the same time permitting ofa' proper grinding surface at their lower parts.

This invention has been practically tested and it operates well, grinding wet bark in a rapid and perfect manner;

Having thus described my invention what I claim as new, and desire to; secure, by Let-i ters Patent, is e c J l; The formingof the conicalhead C, and

rims D, 'F, of abark mill of-eccentric sec-' tionssubstantially as and for the'purpose set forth. c c f 2. The'grater E, whenformed of a series of alternate concave and convex I)", a, asvdescribed.

3. The crushing teeth 7, 9', formed respectively on the arms a, 0, when used in connection with the head C,'rims D, F, and grater E, and placed in the relation thereto as and for the purpose set forth.

4; The alternate long and'short teeth or burs 1, 2, and 3,4, respectively on the rim D, and conical head C, as and for the purpose specified.

5. The combination of the head C, rims D,'F, and grater E, arranged within a case A, for joint operation substantially as and for the purpose set forth.

WILLIAM TANs L-EY.

Vvitnesses r A. GILBERTS,

G. W. BARNEsg sections it

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