US1322339A - Harold m - Google Patents

Description

H.YIVI. PLAISTED. Renucm MILL. APPLICATION FILED FEB. 3,1919. 1,322,339. Patented Nov. 18, 1919.

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HAROLIO M. PLAISTED, OF ST. LOUIS, MISSOURI, ASSIGN' OR T'O WILLIAMS PATENT CRUSHER.ANDPULVERIZER CO., ST. LOUIS, MISSOURI, A CORPORATION OF :i/rIssoUitr.-

T0 all whom t may concern:

Be it known-that ll', HAROLD PLAisTED, a citizen of the United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Reducing-Mills, of which the following is aspe'ciication. L.

This invention relates to certain new and usefull improvements in reducing mills for feed and like material.

The main object of my invention is to provide rotary pivoted means for cutting the feed, as distinguished from pounding or beating it, and to throw the feed forward into the pathof the hammers and outward against the cage. Another object is to provide a by-pass for catching metal, gravel,

. .and Vlike.foieign matter, that the hammers throw outward with the feed, and separate ing the foreign matter while allowing the feed to return to thecage.

In the accompanying drawing on l,which like reference letters indicate corresponding parts, .Figure 1 represents a reducing mill illustratingv my invention, the view being a sectional elevation across the shaft; and Fig. 2 a detail perspective view of a preferred form of hammer as mounted in said mill.

The letter A designates the shaft of a mill 'of the character described, onV which are mounted end disks B carrying hammer rods C on which are pivotally mounted stirrup hammers by their legs D-D,-the inner ends of which are provided with holes'E for said hammer rods.

The outer ends of said legs are shaped to a point lying substantially in a radial plane through the pivot and shaft and these points are connected by a cross bar F which is of the shape of a portionof a cylinder with the concave face toward the front', and said portion of the cylinder lying approximately in the radial plane through vthe pivotal points 'of the legs and center of the shaft. The normal position of the outer edge of the cross bar at the front face is slightly in front of said radial plane,v and is chamfered from said outer'edge backward to the rear to give clearance for the cutting edge thus produced. rThe inner side face of said 'bar is practically at right angles to the radial plane through the pivots and the centfer of'gra'vity `of the hammer when rotating,

and meets the front face in an acute angle that facilitates passing throughx` the feed REDUCING-MILL.

Specification of Letters Patent. Patented-NOV. 18, 1919 Appiioaiionmed February e, 191e. serial No. 274,678.

being operated on, after the` curved front face engages the material in front of it and acts upon it in the following manner. The inner edge of said cross bar is preferably a farther distance `in 4front of said radial plane than the outer edge; and on account of the concave shape'of the front face and the normal position of the hammer in operation, the material being operated on is cleared from the cutting edge by the backward and inward slope of the outer portion of the front face, and is their thrown outward again toward the cage by the reversely curved outer portion of said front face.

The rear face of the bar is convex, being preferably curved concentric with the front face, and together with the outer and inner side faces, constituting a bar that is coniparatively thin in the direction of rotation and pressure, and the forwardly projecting outer and innersides of the bar due to 'its curved form, increase its stiffness while they also cut through the'material; and when this '4 jacent to the cage.V In practice, this stirrup hammer has been made in vcast steel and the curved cross bar has been provided Vith a strengthening rib f at the rear and near the center, and the hardened steel face plate has been riveted in the recess as shown on the drawing. If desired,'however, the face plate may be omitted and the hammer be cast in manganese steel, or other suitable material according to requirements. It is preferred however to provide La comparatively softvmetal for the body of the hammer and vfasten to the front face the concave cutting blade, which is reversible so that the cutting .edge when worn may be replaced by reversing the blade in the recess.

The kcage G is of perforated metal but may be otherwisefornied. The housing of the mill is provided with a suitable hopper H, ,and regulating slide l supported 'by a slanting wall J forming one side of the hopof said cage is conveniently fastened. The

Y back wall M of the housing extends upward from the said opening K, and a topwall N extends from the back wall forward, at about an angle of 45 degrees withfthe verv tical, to its connection with the reversely sla/nting wall J. An inner4V partition wall Ofextends upward from said opening K and parallel to the back wall M, but not reaching the top wall N. A vertical guiding-passage is thus formed from the opening K,

and a pocket R is formed by the partition wall O' and the upper portion of the cageV adjacent and between 'the openings K andL, which openings vtogether with the guiding and detiecting walls described, constitute a by-pass with the intermediate pocket. Thel rotation of the liammers'in y'the direction of the arrow tends to drive the feed outward and upward through the vertical passage between the walls M and O, and it is defiected horizontally over the top of the partition O by the slant wall N, and then down- .ward into said pocket bythe slant wall J. rIhe pocket will naturally lill up with the feed and contained matter that is foreign to the feed, such as metal and gravel, but the surplus material will iow inward againthrough the opening L after the natural slope of material is formed in the pocket as indicated in Fig. l. Any metal will f be driven into the feed material and gravitate to the lower angle of the ocket above the cage and toward the wall The perforations in the cage that forms the bottom of said pocket, willy allow a sifting of the feed materiall backward to the cage, but will retain the metal and gravel and like foreign matter in the pocket. e f" The top froin the back wall M is `preferably removable to form a door,-such as by providing hinges P at its lower side edge connecting f it to the back wall, and a suitablefastening such as a button Q, for the top edge. i

I claim: A mill of the character described comprising a cage havingl an outlet opening and an inlet opening for a 'by-pass, and a casing having walls forming a by-pass connecting said cage openings, and having a recess pocket in the lower side of said by-pass for catching metal particles, and a removable door giving access to said pocket.

2. A mill of the character described comprising a casing having guiding and'deiecting and partition wallsforming a by-pass,

wall N that is slanting forward* receive the pivoting means,

- and a 'cage `forming with 'said partition wall plane-fa backrwall and a partition wall'V forming, a verticalpassage communicating with said outlet, a top wall inclined toward said partition, a reversely inclined-wall in, front of said partition, and a pocket'below thereversely inclined wall `.and adjacent ,tol said inlet opening, substantially asrdescribed. 4. In a mill of the character described a hammer carrier and a shaft therefore, a hammer pivot on the carrier withits axis parallel to tlie-fshafts axis; and a cutting hammer pivoted on the pivot and'having its greatest Vradial length from its own pivot in its longitudinal medial planeso that in action its cutting edge moves in its nearest position to the cage of the mill and in rearward movement ofy he hammer on its Ainner pivot causes its edge to recede from'the cage; the cutting edge being in the radial .plane of greatest length, the cutting hammer having a transverse bar which is concaved on its face transversely from end' to end, the inner edge of the concave beingl in advance from the outer or cutting edge.

5. In a mill of the character a hammer adapted to be pivoted on an `axis parallel to the main shaft of the mill and having a pair of spaced side or end arms to receive the pivoting means, and a transverse tie connecting the swinging ends of the arms and being concaved on its front facel ,from end to end, thevouter longitudinal or `toe edge of the bar beingclose to the medial,

axial plane of the arms and the heel or inner,

longitudinal, front edge of the bar being in a' plane in advance of the toe edge.

described,

6. In a mill of the character described, a

hammer adapted to be pivoted on an axis parallel to the main shaft of the mill and having a pair of spaced sidev or end arms to and a transverse tie connecting the swinging ends of the arms and being concaved on its front face from end to Aend, the outer longitudinal or toe edge of the bar being close to the medial axial plane of the arms and the heel or inner, longitudinal, front edge of the bar being in a plane in advance of the toe edge, anda cutting blade mounted on the lface of the bar. .y y

In testimony whereofJ I have aixed my sgnatue.

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