US 1322210 A
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Description (OCR text may contain errors)
M. F. WILLIAMS.
APPUCAHON HLEI) SEPT.20, I919- 1,322,210. Patented Nov. 18, 1919.
D v Fay 3 O I 6 F H UNITED STATES PATENT OFFICE.
MILTON F. WILLIAMS, OF ST. LOUIS, MISSOURI, ASSIGNOR TO WILLIAMS PATENT CRUSHER 8c PULVERIZER (30., OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.
Specification of Letters Patent.
Patented Nov. 18, 1919.
To all whom. it may concern:
Be it known that I, Munox l \Vnmrurs,
a citizen of the I'nitcd States, residing at St.
Louis, State of Missouri, have invented certain new and useful Improvements in Cages, of which the following is a specification.
This invention relates to certain new and useful improvements of cages for crushers and pulverizers, the peculiarities of which will be hereinafter described and claimed.
The object of my invention is to provide means to fasten securely the ends of an ar' cuate screen so that the ends cannot get loose, bend over, or come in contact with the hammers traveling closely adjacent thereto.
In the accompanying drawing in-which like reference letters indicate corresponding parts, Figure 1 represents a side View of an arcuate cage partly in section; Fig. 2 a reversed plan view of said cage with part broken away; and Fig. 3 an enlarged perspective view of part of the cage showing the construction.
In grinders and pulverizers, the grinding cage is frequently of perforated metal forming a screen which is supported by an arcuate frame in a suitable casing in which is mounted rotary pivoted hammers, the points of which travel in close proximity to the screen. When the metal of which the screen is composed, especially when it is perforated metal, becomes heated from use, it is expanded and beaten against the cross bars, or is formed into ridges and presents an uneven sur'face as well as tending to become loosened at the ends where it is connected to the cage frame. I propose in my present construction to obviate such difficulties and in the accompanying drawing present one form as the preferred fastening means for the ends.
The letter A designates a rotary pointed hammer, a series of which are mounted in any suitable manner upon a rotary shaft B, so as to travel inclose proximity to a screen C of perforated metal, or otherwise, which is carried in a frame composed of arcuate side pieces D concentric with the shaft B, and provided with a slot F in which the screen C is mounted. The sides are con nectcd by cross bars Eat the respective ends, which bars are notched at G for receiving the ends of intermediate supporting arcuate bars H, likewise concentric with the shaft B and thin or beveled on their upper edges h Fig. 3, to avoid stopping up the holes in the screen (1, directly above it. According to the width of the screen, one or more of the said bars I: is employed, and they are spaced on the. cross rods I that pass through them and are riveted into the sides I). At each side of the supporting arcuate bar H, is a cross pin J passing through the cross rod and close to each side of the bar H to assist in keeping it vertical. The slot G in the end bar E holds the ends of said bars H in proper vertical position. The rods 1 are spaced away from the screen C, to prevent contact of the screen with the rods and allow the discharge of material through the openings in the cage.
The ends of the screen are fastened to the cross piece E by means of an overlapping angle-bar K fastened by rivets in both directions to the end piece E. As the hammers travel close to the screen they would interfere with this angle bar if it were not that the'slot F in the side pieces D is tapered or enlarged as shown at F in Fig. 3 for a short distance, in order to allow the ends of the screen to straighten out or be deflected from the balance of the screen, so as to allow the overlapping piece K to rest in the groove F at its ends as shown in Fig. 3, and yet project no farther inward radially than the major portion of the screen C; in this way no interference with the hammers is possible and both ends of the screen are securely fastened to the frame in a similar manner, allowing of reversing the cage as may be required when a portion of the screen near one end is worn unevenly.
The bar K overlapping the screen, is preferably double flanged as shown in the angle bar, so that the thrust of the screen under action of the material being ground, will be resisted by the flange directly fastened to the end cross bar E. The fastening rivets or other means secure the preferred form of overlapping bar in both directions to the cross bar E, and the inner flange of the angle bar secures the end of the screen to the inner face of the cross bar E, yet by the straightening outward of the ends of the screen and the widened slot at F this inner flange does not project into the path of the hammers any more than the arcuate portion of the screen between its endsi I claim:
1. A device of the character described,
comprising an arcuate screen, arcnate side bars having arcuate slots therein, and cross bars forming a frame for said screen,said slots being widened outward at the ends, a bar overlapping the ends of said screen, and fastening means for the latter bar, securing it and the interposed screen to said cross bar.
2. A device of the character described comprising an arcuate screen, arcnate side bars having arcuate slots therein, and notched cross bars forming a frame for said screen, arcuate supporting bars relatively thin compared with the radial depth and located below the screen and engaging said notched cross bars, and supporting the screen intermediately of the side bars, and cross rods signature.
MILTON F. WILLIAMS.