US1123217A - Grinding-mill. - Google Patents

Description

R. N. BAILEY.

GRINDING MILL.

APPLICATION rnnn 12.12, 1913 Patented Jan. 5, 1915.

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UNITED STATES PATENT OFFICE.

RAYMOND NICELY BAILEY, 0F MUNCY, PENNSYLVANIA.

GRINDING-MILL.

Application filed March 12, 1913.

To all whom it may concern:

Be it known that I, RAYMOND N. BAILEY, a citizen of the United States, residing at Muncy, in the county of Lycoming and State of Pennsylvania, have invented certain new and useful Improvements in Grinding-Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in grinding mills, and is particularly concerned with mills of the attrition type.

The main and primary object of the present invention is to improve the general construction and efficiency of attrition mills by the inclusion therein of simple means to prevent the choking of the material as it feeds from the spout into and through the eye of the open runner head, and, furthermore, to so construct such means that there shall be a positive feed of the material in its transit to the grinding plates.

As a further object of the invention, the latter also contemplates such a combination and correlation of parts, incident to the provision of the feeding means, as to provide a receiving pocket or chamber of comparatively large area, at the base of the spout, thereby enabling the material to feed into the eye of the runner head with ease and facility, and without liability of undue accumulation at the base of the spout.

Having, therefore, these general objects in view, and others which will appear as the nature of the invention is better understood, the improvements reside in the novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the appended claims.

In the drawings, wherein is illustrated a vertical transverse sectional view of an attrition grinding mill embodying the hereindescribed invention, the numeral 10 designates the mill casing within which is arranged a solid runner head 11, which head is carried by a rotatable shaft 12 which may be driven in the usual manner, and also arranged in the casing 10 is an open runner head 13 the hub 14 of which is substantially cylindrical and is carried by a rotatable shaft 15 in alinement with the shaft 12, but adapted to rotate in an opposite direction to that of said shaft 12. The means Specification of Letters Patent.

Patented Jan. 5, 1915.

Serial No. 753,743.

for driving the shaft 15 are those commonly found in mills of this kind.

At one side of the casing 10 is the usual feed spout 16, the lower end of which discharges through an opening in the side of the casing 10, and interposed between the discharge end of said spout 16 and the open runner head 13 are juxtaposed sealing rings 17, whereby the unground material is prevented from passing from the spout into the casing 10 without first passing between the runner heads. These latter are pro vided with the usual grinding plates 18.

To accomplish the recited objects of the present invention, the usual construction of the open runner head 13 is modified, and to this end the body of said head is arranged in relation to the hub 14 thereof so as to be positioned at a point substantially midway the ends of said hub and is thereby removed from the inner end of the latter. Hence, the inner end of the hub 14 is projected into the casing 10 to a greater extent than the plane occupied by the body of the head 13, and said body is connected to said hub by radial arms 19 which are curved in the direction of the length of the hub 14. The curvature of the arms 19 is most pronounced, and is of suflicient degree to cause the arms to span the space between the runner heads 11 and 13, and said arms 19 extend from the inner end of the hub 14 backwardly to the body portion of the head 13, thus positioning the body portions of said arms in the space between the runner heads, as indicated. To permit this positioning of the arms 19, the inner face of the solid head 11 has a recess 20 formed therein, into which recess the inner end of the hub 14 projects, and thus extends to a point beyond the middle of the space between the runner heads. Vhen, therefore, the material passes into the eye of the open runner head 13, it is drawn by centrifugal force into the path of rotation of the arms 19, and these latter beat the material outwardly in a radial direction, throwing the same toward the grinding plates 18, and thus serving to always clear the eye of the open runner head, and preventing this eye becoming choked. The rim of the eye to which the arms or spokes 19, are attached, is provided with a sloping wall as at 19*. It will be noted that when the runner heads 11 and 13 are faced in operative position, the construction is such as to provide a centrally located cavity.

By the curved formation of the arms 19, and the positioning of their inner ends at the inner end of the hub 14, a receiving pocket 21 of comparatively large area is formed between the rear edges of the arms 19 and the base of the spout 16, so that the material which feeds from the spout 16 by gravity passes into the eye of the runner head with ease and facility, and reduces liability of accumulation at the base of the spout to a minimum. In this connection it will be observed that the outer or rear edges of the arms 19 extend in a diagonal line from the outer wall of the open runner head to the hub 14 thereof, and are, therefore, offset with respect to the plane of the outer wall of the open runner head, the pocket 21 thereby extending into the body of said open runner head.

From the foregoing description the operation will be readily seen, and briefly stated is as follows: The material to be ground gravitates through the spout 16, and discharges into the casing 10 through the open contiguous side of the same. The runner heads 11 and 13 being driven in opposite directions, the material is drawn by centrifugal force through the eye of the open runner head, and being caught by the rotating curved arms 19 is thrown outwardly thereby to the grinding plates 18-, where pulverization takes place, or the breaking up of the material is effected to the desired extent. As the material passes from the spout 16 it is received by the pocket 21, and by reason of the dimensions of the latter choking of the material is avoided. Free passage, therefore, of the material through the eye of the open runner head is insured. Thus, choking of the material is avoided, and by the curved formation 01' the arms 19, which remove them to a maximum extent from the base of the spout 16, the material is prevented from being blown back and up through the spout 16 by the windage of said arms.

Having thus described the invention, What is claimed as new, and desired to be secured by Letters Patent, is:

1. As an article of manufacture, a runner head for an attrition mill comprising a body portion having an eye formed in the center thereof, a hub in the middle of said eye,

and spokes extending diagonally from the rim of said eye inwardly to said hub thereby providing av recess between said hub and said spokes. the recess being deepest adjacent said hub.

2. As an article of manufacture, a runner head for an attrition mill comprising a body portion with an eye, a hub in the middle of said eye, spokes having their axes extending at substantially forty-five degrees to the axis of rotation of said runner head, said spokes being undercut adjacent said hub to enable the material surrounding said hub to feed axially substantially to the plane of the grinding face before encountering any obstructions.

3. An attrition mill comprising in combination, a closed runner head adapted to be rotated in one direction, a grinding face carried by said closed runner head, said closed runner head being provided with a depression having sloping walls, an open runner head adapted to rotate in the opposite direction, said open runner head also having sloping walls, said runner heads when in operative relation thereby forming a centrally located cavity, and substantially fiat spokes extending across said cavity and rotating directly in the grinding plane to encounter material and throw the same outwardly into the zone of action of the grinding faces.

4. In an attrition mill in combination, a closed runner head provided With a eentrally located cavity, a grinding member on said head, an open runner head including a hub extending across the cavity of the closed runner head, and spokes extending diagonaliy from the end of said hub to the rim of the eye in the open runner head, said spokes crossing the grinding plane and having a portion of their surfaces acting as driving members to positively rotate ma terial fed into the mill and to throw the material outwardly into the zone of the grinding members.

In testimony whereof I affix my signature, in the presence of two Witnesses,

RAYMOND NICELY BAILEY.

Witnesses THOMAS WVoon, H. R. CLARKE.

topic: of thin patent may be obtained for five cents each. by addressing the Commissioner of Patents, Washington, .D. 0.

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