US1403013A - Reducing-mill hammer - Google Patents

Description

F, R. CORNWALL. REDUCING MILL HAMMER.

APPLICATION FIL ED JULY 10,1920.

1,403,013. Patented Jan. 10,1922.

but

FREDERICK R. CORNWALL, OF ST. LOUIS, MISSOURI, ASSIGNOR TD WILLIAIMS PATENT CRUSHER ANS) PULV'JRIZER GOTLEPA'NY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

Specification of Letters Patent.

rammed Jan. 10, 1922.

Application filed July 10, 1920. Serial No. 385,245.

To all whom it may concern.

Be it known that I, FREDERICK R. CORN- WALL, a citizen of the United States, resid ing at St. Louis, State of Missouri, have invent-ed a certain new and useful Improvement in Reducing-Mill Hammers, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in whichi Figure 1 represents a vertical sectional view of the housingof a mill or rotor embodying my improvements.

Figure 2 is a sectional view taken in vertical plane parallel to the longitudinal axis of the shaft.

Figure 3 is a detail view of one form of T-hammer.

Figure 4t is a detail view of another form of T-hammer.

Figure 5 is a diagrammatic view illustrating the relation of T-hammer to the cage in its new or unworn condition.

Figure 6 is a view showing one of the ends of the hammer worn and after the same has been bent outwardly to compensate for its changing radii.

Figure 7 is a similar view showing the worn hammer reversed.

This invention relates to new and useful improvements in reducing mills, and particularly to that type of mills used for grinding, cutting feed, and the like, although, of course, it is obvious that there are many other uses to which the mill may be put in practice.

The object of my present invention is to improve the revolving hammer by making the same preferably of commercially rolled metal in the form of a flat bar which may be bent from a single piece and secured in position without the employment of fastening devices for holding or securing the front and rear sections of the hammer together so that they will move in unison. By making a reversible hammer of the character described in substantially a T form, I provide two active reducing edges at the front and rear and when either of these edges is worn, the blade constituting the head of the hammer, or one portion of the head of the hammer, may be bent outwardly to compensate for wear. When a blade is worn to such an extent after repeated bendings, the hammer may be reversed and the bending operation again resorted to in adjusting the active reducing edge outwardly to take up wear.

Another object of my invention is to make a hammer of the character described more flexible by separating the shank portions thereof. and if desiredthinning the metal of said shank portions. whereby a yielding resilient connection is produced between the hinge eye of the hamme'r'and the head portions thereof which permits the head portions to more readily yield rearwardly in the event that they strike an obstruction such as a piece of metal accidentally fed into the machine.

In the drawings, 1 indicates the casing or housing, and 2 the hopper for feeding material thereinto. 3 is a shaft carrying disks 4 between which are pivotally mountedthe hammers 5 on bolts orrods 6 arranged in the disks. 7 is a so called breaker plate and 8 the cage or screen having openings through which the reduced material passes from the machine.

My improved form 'of. T-shaped hammer is shown in Figure 3, in which 9.indicates an eye portion preferably centrally located with respect to a length of commercially rolled flat bar of iron or steel. 10 designates the shank portions of the hammer which, as shown in Figure 3, are separated or spaced apart throughout their length, an opening or openings 11 being formed therein for the purpose of lightening the hammer and making these shank portions more flexible and yielding. 12 are the head portions bent in opposite directions from the shank portions 10. l/Vhile these head portions may be straight, I prefer that in their original form they shall be slightly curved on a line concentric to the innerface of the cage.

If it is desired to stiffen the shank portions so as to make them less flexible or yielding, the outer ends thereof may be brought together so that they will contact with and reinforce each other as shown in Figure 4. In this Figure 4 the lightening openings in the shank portions have been omitted, the shank portions being shown as being solid.

In Figure 5 I have shown one of the head portions 12 as being concentric to the cage indicated by the dot and dash line 8*, While the other of said head portions 12 has been bent outwardly so as to bring its active re ducing or" cutting edge close to the line 8 indicating the curvature of the cage. As the edge of this hammer portion 12 'is worn away it may be repeatedly bent outwardly, thus increasing its angular relation to its shank as shown in Figure- 6. During these bending operations of the, worn hammer head to compensate for wear, the angular position of the'rear head portion 12 need not be disturbed, as it has space to move toward theline 8 when centrifugal force asserts itself and which unbalancing of the hammer is taken advantage of, as'shown in Figure 7 wherein the hammer has been reversed and its unworn head portion 12 is now presented forwardly while its worn portion 12 is located at the rear. In thisreversed position, the longer head portion l2 will travel in a path relatively close to the line 8 As this head portion 12 becomes worn, it may be bent outwardly as heretofore described. with res ect to the head portion .12". this outward bending increasing the angular relation between the worn head portion and its shank member as indicated by dot ed lines 2 in Figure 7.

\VhatI claim is: V

1. A hammer for mills ofthe character de-' scribed comprising a flat bar bent to form a shank with an eye at the inner end thereof and bent along a line parallel to the eye portion to form a head portion extending in the direction of rotation of the hammer.

2. A hammer for mills of the character described comprising a flat bar bent to form a pivot eve by which the hammer may be mounted in position. the end of said eye being integral with shank portions and the outer ends of said shank portions being bent forwardly and rearwardly respectively to form a reversible head portion 3. A hammer for mills of the character described consisting of 'a bar comprising flexible shanks, an eye atone end of said shanks'forpivotally mounting the hammer, and rigid head portions extending in opposite directions from the other end of'said shanks.

4:. A reversible hammer for machines of the class described including a malleable bar doubled on itself to form a laminated hammer shank, one end of said bar extending diagonally away from the hammer axis to form a hammer head and the other end of said bar extending diagonally inwardly from said head forming endto form a potential hammer head.

5. A-hammer for machines of the character described formed of flexible material and provided witha mounting eye at one end said hammer comprising bars extending to form a reversible and adjustable reducing head near the opposite end of the hammer in opposite directions at right angles to the direction of the axis of said eye.

6. A hammer for mills of the character described comprising shank portions spaced from each other, joined at one end to form a pivot eye, and each provided at its other end with a head portion, said head portions extending in opposite directions, the spacing of said shank portions from each other and the direction of extension of saidhead portions being in a plane normal to the axis of the pivot eye.

7. 'A hammer for a beater mill comprising a single strip of metal bent at or near its central portion and transversely thereof forming a mounting eyev at said bend and also shank portions and head portions extending forwardly and rearwardly of said shank portions.

In testimony whereof I hereunto affix my signature this 30th day of June, l920.

FREDERICK R. CORNWALL.

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