US1845373A - Vibrating screen - Google Patents

Description

Feb. 16, 1932. D. A. WEBER 1,845,373

VIBRATING SCREEN Filed July 7, 1928 3 Sheets-Sheet 1 INVENTQR Fb. 16, 1932. D, WEBER 1,845,373

VIBRAIING SCREEN Filed July 7, 1928 3 Sheets-Sheet 2 INVENTQR D. A. WEBER VIBRATING SCREEN Feb. 16, 1932.

Filed July '7, 1928 3 Sheets-Sheet 5 INVENTOR Patented Feb. 16, 1932 UNITED STATES P A'rE NT ioFHcE Y non A. WEBER, or FORT WAYNE, INDIANA, nssienon TO rnn DEISTER coNcEN'rnA'roB COMPANY, or roar WAYNE, INDIANA, A CORPORATION or INDIANA VIBRATING 'sonnnn Application filed J'i11y 7, 1928. Serial I'd-290,903.

The present invention relates to vibrating screens, particularly, for screening such materialsas sand, g-ravel,'and:the like and has among its objects a motor operated-screen which may be constructed as a portable unit or set up as a-permanent installatiomdepending upon the conditions which it is'desired to meet. V

Another object of the present invention is a" screen which may be so constructed that different kinds of screen fabric .may be used without the necessity ofreadju-stment of the operating parts. 7

A further object is a screen of the type orkind indicated which shall have freemoving parts and theseparts well protected from dirt or other elements tending to interfere with efiiciency in operation. I

lowing description and drawings in'which" i Figure 1 is a perspective view of a portable screen unit embodying the present invention. Figure 2 is a section on an enlarged scale, taken on line 2-2 of Figure? p Figure 3 is a verticallongitudinal section of the screen taken along the mediansline and showing the screen actuating unit. 1

Figure 4 isa more or less-diagrammatic view similar to that ofFigur'e 3 withoutthe actuating unit.

Figure 5.is a viewsimilar to that-of Figure 4 but showing a different character of screen. As indicated in the drawings, the screen unit consists of a frame 10 providedwith spindles for wheels 11, and carrying a second frame 12 which forms the frame in which the meshed fabricl3 is stretched. The

latter may be any suitably meshed fabric of Still other objects w ll readily. occur tothose 20 skilled in the art upon reference to the folthe accompanying At its lowerend, the frame 12 also carries a rectangular extension portion 16, within which may be suspended the tailings box 17-,whi'ch latter may be providedwith suitable, handles 18 to facilitate its insertion The frame l2-may also have provided at its lower end the leg19 which may or. may not be adjustable "and provides with-the wheels 11 a three point base for the unit. Frame 12, as mentioned above, carries stretched therein themeshed' fabric 13, and

this latter is secured at one end of the frame to fixed clamp members 20,-'by means of short bolts 'EZl-vvith plates 22 to prevent tearing the fabric. 'Atthe other end of the frame, the screen fabric. is secured'by means of the U-clamps 25 to which the screen is secured, as by bolts 26, and one or-several plates 27. 1 TheeeU-clainps are drawn toward the end 12a of the frame 12' by means of bolts 28 and means are provided to permit the clamps 25a swinging movement i'na vertical plane by Qthe'knife 'ed'gejbearing-m'embers 29 and 30, the former resting against theframe 112 and'the latter being between the head 31 of bolts 28 and the backcross memberofthe clamp inember25, as'shown clearly inFigures 3,4 and 5. I r

Y Tr'ansversely arranged "beneath the frame 12 is .a channel member 40 carrying on its under side a casing 41 containing the screen actuating meanswhich will be described more in detail later-and this channel member is provided with suitable openings for the passage of the screen actuating rods 42 which are attached atitheir upper ends to a small channel 43 secured to; a second channel 44, which'in turn, is secured to the screen fabric wireorother suitable'materlal, wire-being The two, channels .43 and telescope and are secured together by the thumb nuts 45 located above thescreen. i VVithinJthe casing 41, the screen actuating rods 42 are] secured'together by; means of 2.

their lower ends. These rods extend through the upper part of-the casing to a sufiicient yoke 53 connecting the rods preferably at 1 distance beyond and aredfixed to'the channel member'g'in f any suitable manner and, at

the point where they pass through the 'casing and the supporting channel member 40,

felt washers 54 are provided to prevent passage of oil.

The rods 42 preferably fit in the openings in the upper part of the casing 11 so as to have a bearing therein and the lower ends of the rods are guided by means of a projec tion 55 on yoke 53 which extends into a suitableh'ollow boss 56 and has bearing therein; the projection 55 being provided with a passage 57 therethrough so as to allow passage of oil into the boss. The effect of this passage is not only to supply oil to lubricate the bearing in the boss 56 but as the yoke 53 vibrates, this passage forms a jet of oil which plays on the roller 60 so as to lubricate it and the cam 61.

On the upper side of yoke 53 is mounted aroller 60 adapted to coact with a cam 61 fixed to the end of a shaft 62 extending from one side of the casing to a suitable motor 63,

carried, preferably, at the upper end of the frame-12. The cam 61 is provided'with one or more teeth or projections 64 whlch act upon the roller 60 to cause the yoke and rods :42 to be pulled down and released with each revolution of the cam.

. Mounted above the casing ll and preferably upon the supporting member 401s a comparatively strong compression'spring 65 :which abuts against the supportingmember 40 at one end and at its upper end bears against a shoulder 66 of an adjusting nut 67 carried .upon a threaded stud 68 fixed in the channel member 43, as indicated clearly in Figure 2.

'This'spring is compressed upon the downward stroke of the rods 42 and, when the cam .has rotated further to release the yoke and -rods,- causes the upward movement of the .drawn tightlylongitudinally by means of the bolts 28' and the nuts thereon and is also drawn'downwardly from a straight line position to a point somewhere below the. latter, this being accomplished by providing the rods 42 of suitable length and drawing down the screen thereon by means of the thumb nuts 45. The amount of deflection below the straight line position need be very small and with the parts arranged as shown, can be a fixed amount for all thicknesses'of screen.

The relation between the lower. side of the screen in clamp 25, the lower sideof the screen in clamp 20,and the upper side of "the'channel member 43 may be fixed and need not be changed, This is possible when placing the actuating mechanism under the screen butis not readily accomplished in those mechanisms in which the actuating means is placed above the screen.

In changing from one thickness of screen to another, the difference in thickness will preferably be compensated for in the clamp 25 by the use of suitable shims 70, less shims, of course, being use-d with the thicker screen than with the thinner one. Figure 4 shows the use of three thin shims for example, while Figure 5 shows a single one. In lieu of shims, set screws may be placed in the upper arm of the clamp 25.

Now having described the invention and the preferred form of embodiment thereof, it is to be understood that the said invention is to be limited not to the specific details hereindescribed and illustrated but only by the scope of the claims which follow.

1. A vibratory screen comprising a frame,

screen fabric therein secured under tension at opposite sides to said frame, means for drawing the central portion of said fabric to a position below theplane of its ends, and

actuating means beneath said screen adapted 90 to draw said central portion further from said plane and release it.

2. A vibratory screen comprising a frame, screen fabric therein secured undertension at opposite sides to said frame, and actuatin means for said fabric adapted to maintain the intermediate portion of. said screen below the plane of its ends and to causeisaid portion to move relatively to and in a path transverse to, said plane said path lying wholly below said frame.

3. In a vibratory screen unit, a frame, a screen fabric supported at its ends therein, means for tensioning said fabric longitudinally of said frame, a substantially rigid member extending transversely across said fabric and secured to its underside, an actuatlng member secured to said first member and maintaining the latter below the plane of the ends of said fabric, a cam follower carried by said .actuatingimember, a cam adapted to cause said follower and thereby said actuating memberto move in a path transverse'to said fabric and entirely below sald plane, and means carried by said unit to actuate said cam.

at its ends in said frame and adapted to be moved by said means in a direction transverse to its own. plane, and means to fix the path of said-movement below the plane of its ends; V

j 5; In a vibratory screen unit, a frame,

screen fabric, means at the ends of said frame for fixing said fabric therein, means secured to the underside of said fabric at anintermediate'portion thereof and off-set from the plane of the ends of said fabric, and means for maintaining the relative positions of said end fixing means and the'other means when said fabric is in rest position adapted to maintain their relative adjustment fixed irrespective of the thickness of the screen fabric.

6. In a vibratory-screen unit, a frame,

screen fabric therein, a channel member secured to the underslde of sald fabrlc, a longitudinally movable rod fixed perpendicularly to said channel, means to maintain said channel and that portion of the fabric to which it is attached displaced below the plane of the ends of the fabric, means to move said rod and channel to cause further displacement and to release the same When said further displacement has been caused, and means to return said channel and rod to the position of initial displacement.

port A. WEBER.

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