US1317769A - Bgtagy pivoted hammeb - Google Patents

Description

0.1. WILLIAMS.

ROARY PIVOTED HAMMER.

APPLICATION msn MAY 23. 1919.

Patented Out. 7, 1919.

OLIYERJ'. WILLIAMS, 0F BURLINGABIE, CALIFORNIA, ASSIGNOR T0 WILLIAMS PTENT CRUSHER t PULVEEIZER CO., OF ST. LOUIS, MISSOURI, A CORPORATION 0F MISSOURI.

ROTARY PIVOTED HAMMER.

Specification of Letters Patent.

Application 'led. May 28, 1919. Serial No. 300,237.

To all whom t may concern.'

Be it known that I, OLIVER J. WILLIAMS, a citizen of the United States, residing at Burlingame, in the county of San Mateo and State offC'alifornia, have invented ycertain new and useful Improvements in Rotaryv Pivoted Hammers, of which the following is a specification.

This invention relates to certain new and useful improvements in rotary .pivoted hammers the'pejculiarities of which will be hereinafter desbribed and claimed.

The main object of my invention isV to provide a rotary pivoted hammer especially adapted for cutting fibrous material and shredding feed such as alfalfa; another object is to provide such a cutting edge upon a worn out hammer of the style named hereafter and renew-the life of said hammer. In the accompanying drawing on which like reference letters indicate corresponding parts Figure l represents a vertical sectional elevation across the shaft of a machine provided with my improved hammers; Figq' an enlarged view of the operative cuttingend of such a hammer; Fig. 3 a view of Athe width or side face of such a hammer; Fig. 4 an edge view of the same as it lies inthe plane of rotation; Fig. 5 a double-ended rectangular bar hammer shown in face view or width, the life of which itis desired to renew; and Fig. 6 an edge viewfcf the latter hammer.

The lettere. designates the shaft of a ma# chineon which are mounted suitable disks B carrying hammers C'by hammer rods D vlpassing through said disks. The disks are cut out as shown, for the reception of the pivoted ends of the hammers which are thus mounted alternately in circular rows in the planes. of rotation. A suitable cage E cooperates with the outer or operative ends of said hammers, and a suitable casing F incloses the cage and rotor above described.

These hammers consist of a dat rectangular bar of steel of considerable width as compared with the thickness, and such width is 2 inches for example, while `the thickness or lesser dimension of the bar varies from gth of an inch to Sth of an inch, according to the material lthat it is desired to operate on. and shred or cut in said machine. This style of hammer has near one end a hole G-for pivotal mounting on the hammer rod D, and at the other end is formed a recess H consisting of a semi-circular base to a triangular slot, the sides lI of which are formed by planes converging from the opposite ends of the base to the outer end or head of the hammer where they intersect at the axis J through the shank and pivot center G.

Acute angles are thus formed which pro' vide oppositely directed cutting edges K K that are substantially in the axial plane and are as long as the shank is thick. Said cutting edges may therefore be reduced to a -llth of an inch when such is the thickness of the rectangular bar, vor may be th of an inch when such is the thickness of said bar. In order to make said cutting edges op; erative in the reverse directions when. the hammer is reversed on its pivot so as to bring thev opposite edge to the front, the divided head or prongs forming said head, are odset in opposite directions laterally as shown in Figs. 2 and 4r. rihe cutting edge K therefore has cl'ear action upon the material when rotating in one direction, while the offset prong with its edge K has similar unobstructed action when the hammer is rotating in the opposite direction,as would be the case when the hammers arereversely .mounted upon the hammer rods to bring the `other' cutting edge into action when the previous action of the first cutting edge has been diminished by wear.

It will be observed that the cutting edge K connects by the straight plane il with the semi-circular base of the recess H which thus serves as a clearance for the material being cut. The same opening acts as a clearance when the opposite cutting edge is in action as when reversely mounted. Theouter corners of the head are preferably rounded at L so that the odset prongs are provided with clearance at the outer ends between the cutting edges and the cage E and constitute what is known in the trade as an .deal point or cutting edge. It will be noted that on account of these cutting edges K-K being substantially in the radial line through the pivot of the hammer and the shaft A,

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- edges thus being formed upon a practically mon form of hammer is used vwhich hammer is shown in'detail in lligs. 5 and 6. This hammer C is made of a plain rectangular straight bar of steel of suitable length and having square ends provided near each end with a hole G-H adapted alternately to form the pivotal point of support when mounted respectively upon the hammer rod D. When this form of hammer has beenl worn oi at the corners as shown by dotted lines in Fig. 5,. and all four corners have been worn down by yreversing the hammer upon the rod D, th1s hammer is practically ,Worn out. It is another object of my invention to renew the life of such a hammer by cutting a triangular portin from onepivot hole, such as H Fig. 5, to the adjacent end, and offsetting the prongs of the divided head thus formed in opposite -directions so vthat it will form a recess and present the appearance of the hammer shown in Figs. 2, 3 and 4 previously described. Two new cutting wornout hammer, will renew its efectivo use and operation at slight expense by providing two cutting edges like those shown and described above. l Y

Another function of the finished hammer as shown in this application, is that therounded corner on the forward side edge of the hammer that was previously a square 'corner but now has beenworn down and in my improved construction has been bent to one sideof the central plane of rotation, .will

-therefore the rounded edge .stillact but with a scrubbing eect upon the material in `the cage, while it will be followed up immediately by the cutting edge on the same hammer in the new form shown; and the cutting edge both on the same her and both on the forward edge for the time being of the said hammer, act in conjunction and supplement one another by their rubbing and cutting effect practically simultaneously operatmg.

lit is understood that my form of hammer as above described may be made from -a blank of proper shape 1n the first instance without waitlng for a hammer of the style shown in Figs..5 and 6 to become worn out or become rounded on its edges before ehanging it to the style of hammer shown in the previous figures and thereby renewing its life and eEect'iveness. Likewise a statement of dimensions is given for the purpose of illustration and l sizes mentioned.

I claim:

l. A rotary pivoted hammer comprising a rectangular bar shank of a greater width than thickness having a hole near one end for pivotal mounting, and having a recess am not confined to the at near the opposite head end in the axis of said shank,-sa.id recess dividing the head i end into two prongs, and said prongsbeing set. out laterally in opposite directionsfrom the plane of the width of the shank.

2. A rotary pivoted hammer comprising a rectangular bar shank of a greater width in the plane of rotation than thickness,

having a hole near one end through the lesser dimension of the bar for pivotal mounting,

and having a recess at the opposite head endv shaped like a semifcircle with its two ends connected by substantially straight planes to the head end of the axis through the shank, formingl two prongs with acute cutting edges,-said prongs being o'set laterally in opposite directions from the wide faces of` said shank and having reversible cutting whereof I have ailixed myv a dat bar shank having a head

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