US 2391501 A
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Description (OCR text may contain errors)
F. JI OBRIEN SCREEN PLATE Dec. 25, 1945.
File d June 22, 1944 flieg.
APatented Dec. 25, 1945 UNITED STATES PATENT OFFICE` SCREEN PLATE y Fred J. OBrien, Mount Vernon, N. Y. Application June 22, 1944, Serial No. 541,556
`1 Claim. (ci. 209-397) This invention relates generally to the art of screening but more particularly to certain new and useful improvements in screen plates.
It has for one of its objects to provide a plate of this character for screening machines which is simple and inexpensive in construction and which is so designed as to withstand maximum wear and provide for a thorough tumbling or turning over action of the material to insure efficient screening results.
Another object of the invention is to provide a screen plate having rows of punched holes therein whose opposite side edges extending lengthwise of the screen are provided with turned-up rims or flanges which project above the surface lof the screen plate and intercept and deflect the material vertically and laterally as it iiows over the plate.
Other features of the invention reside in the construction and arrangement of parts hereinafter describedand particularly pointed out in the appended claim.
In the accompanying drawing:
Figure 1 is a sectional side elevation of a screeny body or frame having my improved screen plate installed thereon. Figure 2 is an enlarged frag'- mentary top plan view thereof. Figure 3 is an enlarged cross section taken on line 3 3, Figure 2. Figure 4 is a fragmentary perspective View of the screen plate.
Similar characters of reference indicate corresponding parts throughout the several views.
Referring now to the drawing, I()I indicates al vibrating screen frame of any ordinary construction and Il indicates my improved screen plate or deck mounted in any suitable manner on such frame, it being understood that the material is delivered to the upper or right hand end of the screen frame and flows downwardly thereover with the minus material delivered below the screen plate and the positive material delivered over the lower or left hand end of the frame.
The screen plate consists of a sheet-like body of metal or other appropriate material having rows of holes or openings I2 formed therein by punching or the like, the rows Vbeing preferablyv vin Figures 2 and 4. These holes are substantially square or rectangular in shape and are uniformly spaced, and at those opposite side edges thereof v extending lengthwise of the screen or parallel to the ow of the material thereover are upright flanges or rim-like projections I3 which extend slightly above the surface of the screen plate. By preference, these flanges are formed integrally with and bent upwardly from the screen plate and are of the same lengthwise dimension as the holes. It will be noted that the opposing flanges of a pair of holes in one row are centrally alined with the holes in adjoining rows, thereby allowing the plus or oversize material to slide quickly over the screen plate and prevent its plugging.
While manifestly simple in construction, this screen plate is eflcient in operation, its rim-like projections guide the material in a straight path in the direction of flow thereof and impart suicient action to the material to keep it turning over and over and effecting complete separation or screening of the minus material from the coarse or plus material. Furthermore, the projections vailord increased wear to the screen plate and do tangular in shape with those edges thereof in staggered relation being provided with flanges rising therefrom above the surface of the body and extending lengthwise thereof in the edgewise path of flow of the material.
FRED J. OBRIEN.