US1882908A - Screening apparatus - Google Patents

Description

Oct. 18, 1932'.

M. P. REYNOLDS 1,882,908

SCREENING APPARATUS Filed Sept. 15. 1930 IN VEN TOR.

7770116 fimsolz Fcyno/c/s BY I A TTORNEY Patented Oct. 18, 1932 UNITED STATES PATENT OFFICE MORLEY PUNSHON REYNOLDS, OF CLEVELAND, HEIGHTS, OHIO, ASSIGNOR TO THE W. s TYLER COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO SCREENING APPARATUS Application filed September 13, 1930. Serial No. 481,715.

The present invention, relating as indicated to screening apparatus, is more particularly directed to a new and improved screen unit for use in screening apparatus, the unit consisting of a section of woven wire screen provided with a reinforcing strip of a new and improved type associated therewith along two opposite edges of the screen section. The principal object of the invention is the pro vision of a screen section or unit of the character referred to which may be employed in an inclined screening apparatus in which the screen is supported at its top and bottom edges, to secure a marked increase in uniformity of vibration and an increase in-the stiffness of the screen along the reinforced edges. Other features of the invention will appear hereinafter and include an increased capacity and convenience for nesting for shipment, an increased resistance to distortion or bulging and other features.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims the annexed drawing and the following description setting forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing V Fig. 1. 's a side elevation partially in section of an inclined screening apparatus in which my new screen section is incorporated; Fig. 2 is a plan view of the screen section; Fig. '3 is a section on the line 33, Fig. 2; Fig. 4 is a section similar to Fig. 8, but showing a modification of the reinforcing means for the screen section; and Fig. 5 is a similar view showing still another modification.

Referring now to Fig. 1, I have shown a screening apparatus consisting of a rectangular box-like casing 1 mounted on suitable supports 2 and 3 which may, if desired, be adjustable for varying the angle of the screen. It will also be understood of course that my improved screen section may be employed in other types of apparatus than that here shown, which I have shown merely for consection is mounted within'the box-like casing '1 as at 4: in Fig. 1 and is provided with hookshaped strips 5 clamping over both upper and lower ends for attachmentto angles 6, one or both of which is adj ustably mounted in the casing for tensioning the woven wire screen 7, which is supported between the hook-like strips 5 in the usual manner.

My improved screen unit consists of a woven wire screen 7, (see Fig. 2) provided with hook-shaped engaging strips 5 along two opposite sides, in this case the top and bottom edges, andwith reinforcing or vibration distributin members 10 disposed along the other two e ges 11 and 12. These edges are unsupported in that they are not mounted or fixed to any portion of the casing. These 1 vibration distributing members consist of a strip or sheet of metal 10 bent into the form illustrated in Fig. 3, that is, provided with two approximately parallel flange portions 13 and 14, which engage against the upper and lower edges of the screen, respectively, to which they are secured by bolts 15 and nuts 15a. At their outer edges the flange portions 13 and 14 merge into a channel element 16 extending upwardly at an obtuse angle to the plane of the screen, this resistant but resilient portion of the strip acting to stiflen and support the otherwise unsupported edges of the screen and to very effectively transmit vibration imparted at one or more points of the screen surface to all portions of the screen.

It will of course be understood that various means for imparting vibrations to the screen surface may be employed, such for example as an electro-magnetic vibrator 20 mounted on the top of the casing 1 provided with an armature secured to a bracket 22, which is in turn secured to a strip 23 extending transversely of the screen. The vibrations of the armature 21 are thus imparted to the screen, and, in the ordinary apparatus of the type in use up to the present time, are transmitted through the screen surface in the form' of waves, the amplitude of which is usually the maximum at the point of attachment of the armature and a minimum at either fixed edge of the screen surface. The

result is a lack of uniformity of vibration over the screen surface and a loss of efiiciency in the screen.

The metal strip 10 possesses certain peculiar advantages arising from the angular relationship and relative length of the two legs 16a and 16b (s-ee'Fig. The outer and inner legs 16?) and 16a, respectively, of this strip are of different length and the center of curvature ofthe lower curved portions 30 and 31 are not of the same radial line. By reason of this relationship the two legs cannot bend in unison or about the same axis since their outer ends are integrally connected. The result is an extreme stifi'ness and rigidity in the reinforcing strip and a corresponding strength in the edge portions of the screen which prevent sagging and permit of uniform transmission of vibration throughout the screen surfaces. A further advantage of the present construction is the finished quality of the unsecured edges of the screen. Screens are ordinarily secured at two opposite edges, leaving the other two edges free and these edges ordinarily present a ragged and sometimes dangerous surface for handling. The present construction encloses these surfaces, preventing any possibility of injury to workmen or operators during changing, adjusting or other handling of the screen sections.

My improved screen section has the effect of greatly increasing the uniformity of vibration over the entire screening area, thereby materially increasing the efficiency and accuracy of the machine. Other advantages of my improved construction are the strength of the reinforcing section which allows the sections to retain their original form during the life of the screen and the resistance which these bent sections give to the screen edges, thus preventing the bulging and sagging, and increasing the effective life of the screen itself. The height of the vibration distributing elements increases the capacity of the screen sections, preventing leakage or spillage over the side edges and make it unnecessary to employ any packing strips to prevent leakage. An additional advantage lies in the form of the elements or side boards, as they may be called, which permits screen sections thus reinforced to be nested conveniently and compactly for shipment. When so nested they are protected from any clamage.

In Fig. 4 I have shown a modified type of reinforcing means for the edge of the screen. In this form of my invention the screen 25 is reinforced along two opposite edges by angular members 26. Each of these members comprises two legs 27 and 28, the leg 27 being secured against the edge of the screen by bolts, rivets or the like, which pass through this leg of the angle and through a second plate 29 disposed on the lower edge of the screen. The other leg 28 of the angle extends upwardly at a slight obtuse angle to the plane of the screen and corresponds with the upwardly extending portions 10 and 16 of the construction shown in Fig. 3.

In Fig. 5 I have shown still another modification in which the screen 30 is provided with an upturned edge portion 31 which is reinforced by a rebent U-shaped strip 32 of metal, which lies against and-encloses the angularly bent portion of the screen and the adjacent flat portion. This enclosing strip 32 isapplied by being first secured over the edges of the screen, after which the screen and strip are bent as a unit into the form shown in Fig. 5, the strip being secured to the screen by any suitable means.

It will be understood that for most uses I employ the construction shown in Fig. 3, but that for certain conditions and for certain types of screens either of the reinforcing means of Figs. l or 5 may be used.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed. 1

I therefore particularly point out and distinctly claim as my invention.

1. In a vibratory screening mechanism, a woven wire screen supported along opposite edges, and a vibration distributing element secured to and extending throughout one free edge thereof, said element consisting of a formed metallic plate having its two edges secured above and below the free edge of said screen and having its body portion extending upwardly from said screen at an angle to the plane thereof.

2. In a vibratory screening mechanism, a woven wire screen supported along opposite edges and-vibration distributing means associated with and extending throughout the free edges of said screen comprising angularly related screen edge portions, and rebent U- shaped metal strips engaging over and secured to said edge portions. 7

Signed by me, this 9th day of September, 1930.

MORLEY .PUNSHON REYNOLDS.

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