US2183991A - Vibrator screen support - Google Patents

Description

N A M s A H l VIBRATOH SCREEN SUPPORT Filed Nov. .25, 1938 i lNvENToR JAMES HASMAN ,#f; f W07 ATTORNEYS Patented Dec. 19, 1939 VBRATOR SCREEN SUPPORT Application November 25, 1938, Serial No. 242,225

3 Claims.

This invention relates to improvements in vibrator screen supports and more particularly to means for holding a screen under evenly distributed and steadily maintained tension.

As is well known, vibrator screens do their best work when maintained under spring tension and when all portions of the screen are as near as possible under even tension.

An object of the present invention is to provide l novel means for maintaining an evenly distributed pull on the vibrator screen and resilient means for insuring tension on the screen at all times.

Another object of the present invention is to provide a novel combination of skirt boards or balde plates adapted to guide material onto and retain material on the screen, such boards or plates being ci resilient metal engaging the screen so as to hold it under tension.

Other objects and advantages of the inven- 20 tion including novel formation and arrangement of the parts composing the structure will be apparent from the accompanying drawing and spccication and the essential features thereof will. be set forth in the claims.

25 In the drawing, Fig. l is a plan view partly broken away showing my invention as supplied to one form of vibrator screen; while Fig. 2 is an enlarged detail section taken along the line 2-2 of Fig. l.

30 In the drawing, lil refers generally to a comparatively rigid frame which serves to support the screen i l. The frame lli may be of any suitable forno, the one shown being made up of structural shapes, it only being necessary for the 35 purpose of the present invention that there be side members ida` of the frame lying along opposite side edges of the screen so as to apply a stretching force to the screen. The screen Il is often of a very fine mesh which is difficult to .t0 stretch evenly and tightly and therefore for the purposes of the present invention I have shown metal strips l2 substantially coextensive with oppositie side edges of the screen ll and clampingly secured` thereto in any suitable manner as for 45 instance by rivets or bolts. Both sides of the screen are alike and so only one is shown in Fig. 2, it being understood that the other side has similar parts.

Means is provided for exerting an evenly dis- 50 tributed pull to the strips l2 and in the present instance this comprises a pipe i3 extending along the entire side of the screen and slotted, as at its so that the screen with the clamping strips attached may be inserted and removed length- 65 wise of the pipe la. It win be noted that the 1nterior diameter of the pipe is adapted to accommodate the strips l2 and when pull is exerted on the pipe the edges thereof adjacent the slot give an evenly distributed pull along the entire length of the strips i2. For so pulling on the pipe i3 5 to stretch the screen, at various points along the length of the pipe are rigidly secured thereto the bolts i4 as by welding at point ida.. These bolts extend upwardly and outwardly through suitable apertures in the frame members ida and nuts l5 10 pulling against suitably arranged shoulders I6 apply a stretching eiTect to the screen. The bolts i4 are spaced along the side of the screen at sufcient intervals to exert an evenly distributed pull.

Means is provided to hold the screen under resilient tension when it is stretched by pulling upon the bolts Hl. This means comprises resilient metal strips l rigidly secured along their upper edges to the frame as at lla by welding or otherwise and having their lower edges at the portion lib engaging the screen. Since the strips Il are coextensive with the opposite side edges of the screen they exert their resilient tensioning efect at all points along each side of the screen. For cheapness of construction and to engage the screen with the minimum of wear the portion l'lb may be constructed substantially of a circular section such as a cut-out portion of pipe, if desired. As illustrated in the drawings, the strips or plates il are so constructed and position as to form uninterrupted surfaces extending upwardly and outwardly from the screen engaging portions i'lb` so that the plates ll form skirt boards or baffles directing material onto the screen and holding material from lateral movement ci the screen.

It will be obvious from an inspection of Fig. 2 that the pull on the opposite side edges of the screen where the pipe I3 engages the clamping 40 strips i2 pulls upwardly against the resilient plates ll so that these plates in effect form leaf springs to hold the screen under a resilient tension.

Since all of the parts shown here move together as the screen is vibrated. there is no relative friction between them.

What I claim is:

l. A vibrator screen support comprising a screen within a frame, resilient metal strips supported by said frame, one strip along each of opposite side edges of said screen, each strip engaging said screen from end to end and inwardly from the side edges of said screen, and means for exerting an evenly distributed lateral pull along the side edges of said screen in a direction to pull said screen against said strips.

2. A vibrator screen supportl as in claim 1 wherein said resilient metal strips are uninterrupted baffles sloping upwardly and outwardly from their screen engaging portions so as to form skirt boards.

3. A vibrator screen support comprising a screen, a frame having portions lying outside opposite side edges of said screen, clamping strips extending continuously along opposite side edges of said screen, tubular members longitudinally slotted and coextensive with said strips and embracing said strips with said screen extending

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