US2193954A - Vibratory screen - Google Patents

Description

March 19, 1940. M. F. WARNER 2,193,954

VIBRATORY SCREEN Filed May l2. 1958 4 Sheets-Sheet 1 @F9 M5 @W6 ImT IWI 7 Il 1-11- Il: :l/

March 19, 1940. M WARNER 2,193,954

V'IBRATORY SCREEN Filed May 12. 1958 4 sheets-sheet 2 4" :r I 4 5 im@ 7 im? 6 111|'l F. 11 12'( l @um +6 Ml@ March I9, 1940.

M. F. WARNER VIBRATORY scm-:EN

Filed nay 12.195e 4 sheets-sheet s @Sw amm, Wm fm March 19, 1940. M. F. WARNER 2,193,954

vIBnmronY SCREEN Filed May 12, 1958 4 Shets-Sheet 4 Patented Mar. 19, 1940 PATENT OFFICE 2,193,954 vIBRAToRYpscRsE, y

Munroe F. Warner,v Columbus, Ohio,Y assigner tor American Zinc, v,Lead t ,Smeltingompany St. Louis, Mo.,l a cprporaton `oirlVlaine Application May 121, 193s, serial-N0. 207,633 warms; mmoefsis) This invention relates to vibrating screens` and 'to the particular means for mounting thesame whereby the vibration of the screen can 'be more efliciently effected and which, when certain classes of material are being screened, can be o p- @ratedv with minimum injury to the structure as a whole.

Existing screens of the vibrating typeare of ytwogeneral designs, in one of which rthescreen cloth is vstretched and attached rigidly lwithin a frame andthe entire frame vibrated.` I n this .case the mass or weight to `be vibrated is l greater than is desirable and imposes heavy loads upon the vibrator and bearings, and results in severe reaction on' the foundations and supports. In the `other type the screen clot-h is stretched .betweensirnple springs for light service, the vibrator being attached .directly to the vscreen cloth so that the screen cloth itself is directly vibrated thereby. `In this case Vibration is intense'in the middle of the screen area, where the vibrating mechanism is attached, and ris toa great degree diminished or even absent at the edges and `ends of theA screensurface.`

lOne of the objects of Athe present invention is to so mount the screen cloth 'that vthe entire screen surface shall be free to lvibrate andgat the Sametime reduce the mass or weight ytombe Viorated. This is accomplished by `providiizig a devicel or devices which shall be free to move within required limits in a direction vlnormal to the screen surface during vibration, `which devices yare carried by -iiXed or non-vibrating -supports. l

The inventive idea is capable of receiving a varietyl oi mechanical embodiments, vsome o f which for thepurpose of illustrating ythe-invenvtion' are shown lin the accompanying drawings,

but it is to be expressly understood -thatsuch drawings are i'or the purpose of illustration only and are not ,designed to define thelimits of theinvention, reference ybeing had to `the.il/.ppended claims for this purpose.

IIn. said drawings- Fig. 1 is a plan view partially broken-.,away, illustrating twov forms of one lembodiment .oi the `invention; ,.J

Fig. 2 is an end elevation of Fig. 1;

50' Fig. 3 is an enlarged sectional `detail-pf the construction shown in Fig. 41;

Fig. 4 is a plan View rpartially y,buiken.faraway showing a modication of the invention;

fFig. .5 `is an end elevation-of Ethe.,Constructlrm shown inFigA; y Y y Fig. 6 is an enlarged section in detail of the construction shown in Fig. 4;

Fig. 7 is a plan view with parts broken away of lstillanother modification;

`Fig.'8 is anelevation'of Fig. 7;

Fig. 9 is an enlarged sectional View of the structure shown in Fig. 7;

' Fig. 9a is a detail Asection showing a slight modification of Fig. v9; and

Fig. l0 illustrates a still further modication of Fig. -9. v

y"Referring `to the drawings in which like reference numerals indicate like parts throughout the severa-1 views, `l-I indicatek stationary side bars mounted on any suitable supporting structure, not shown, one of these bars being placed on eachA side of the screen structure, and 2--2 indicate screen anchors preferably right angular in cross section, as shown in'Fig. 3. These screen yanchorsare placed between the respectveside bars, one adjacent to each side vbar'. These screen anchors areeacli yieldingly connected to the rethe screen anchors may have a Vibrating move- -ment up and down vwith relation to the side bars `and yin aA plane approximately normal to the spective side barsof the structure to the end that screen cloth'.v As shown in Fig. 3, the screen ani Ycliors"21h'ave abearng block or a plurality of bearing blocks' 2' rigidly connected thereto and extending upward therefrom so'` that the blocks constitute in effect an upward extension of the screen' anchors'. Theseblocks 2 have formed therein,`on the side adjacent to the side bars I, a `groove 2, and a secondbearing block or strip v-I-K isr` rigidly secured `to the inner face of the side bar. This bearing -b-lock i has formed therein ya groove l" approximately opposite and prei- .erably slightly/below the groove '25 in the bearing block 2f, and abar 3, preferably having rounded edges, vextends* between and takes piv- .,banasshowninthe lleftof Fig. l, `or-the same l.may be ,a y,continuous Ibar 3, r`as shown vin the fright ofgFig. yl andextending the full length of 4 the screen, ibut in either construction the yield- Otalbearingin the'two grooves l and y2, the f ing action is in a plane approximately normal to the screen cloth.

On the exterior of each side bar I is mounted a bearing seat 4 (Fig. 3) for aspring 5, the outer end of the spring taking against afollower 6 through which follower extends a pin 'l hinged to thebearing block 2 at 8 so as to permit the pin I to move in a vertical plane around the pin l. The exterior end of the pin 'I is screw threaded and has anut 9 thereon, whereby the follower is forced inward against the spring to place the same under compression.

A series of these spring devices is placed along each side of the structure, and in operation thenuts 9 are tightened until therods 1 are brought to a horizontal position and centered within the springs, at which point the screen cloth will be properly tightened and its tension counterbalanced by the springs.

The screen cloth I is stretched between thescreen anchors 2, preferably with the edges of the screen cloth turned around and over the horizontal arm of the screen anchors, as shown at le in Fig. 3, but it is to be understood that any ecient means for securing the screen cloth to the screen anchors may be employed.

Now, referring to Figs. 4, 5 and 6, there is therein shown a modification in which thesame spring construction 5 illustrated in connection with Fig. l is also employed, together with the same screen anchors and upwardly extendingelements 2. In this structure the yielding connection of the screen anchor to the side bars takes the form of a hingle. A series of upwardly and inwardly inclined bars II (Fig. 6) are pivoted to the upper end of anchor extension 2' by a pin I2 and to the side bar I by a pin I3 to the end that the screen anchors and with them the screen cloth may be free to move up and down with relation to the side bars. 'I'he pins I2 and I3 may extend the entire length of' the screen as at the right in Fig. 4, or there may be a separate pair of pins I2 and I3 for each hinge bar as at the left of Fig. 4. As in the case of the bar construction heretofore described, there may be a plurality of bars II, one located at each of the spring tension devices (see left of Fig. 4) or if desired, there may be a continuous series of' hinge members along the full length of the screen and hinged to the side bars I and theanchors 2 as at the right of Fig. 4.

Referring now to Figs. 7, 8, 9, 9a and 10, there is shown therein thesame spring device 5 as that described in connection with Figs. 1 to 6, inclusive. In the construction shown in Fig. 9, thescreen anchors 2 are yieldingly connected to the side bars I by means of spring bars I5 extending from points outside of the side bars and through openings therein and to a point above the anchor bar Z where each bar I5 is rigidly secured thereto. The exterior end of the spring bar I5 is mounted in a housing I 'I rigidly secured to the exterior of the side bars, the spring bar being rigidly bolted within the housing as shown. By this construction a yielding connection is aiorded between the anchor bar and the side bar. Such yielding connection is obtained in a modied form by the construction shown in Fig. 9a in which the spring arm I5 is hinged to thescreen anchor 2.

Instead of providing an elastic bar I5, as shown in Fig. 9 and depending upon the resiliency of the bar itself to respond to the vibrations, a rigid bar I5' (Fig. l0) may be employed hinged at its inner end to thescreen anchor 2, with its outer end in the housing I'I, which housing is rigidly secured to the exterior of the side bar I. Resilient material, such as rubber, is mounted in the housing on each side of the rigid bar I5', to the end that the end of the bar I5', where it is hinged to thescreen anchor 2, may be permitted to move similar to that of the spring bar I5, shown in Fig. 9.

It will be observed that whatever be the form of yielding connection employed between the side bars and the screen anchors, the pivotal connection of the spring tension device is connected to the anchor bars at a point intermediate said yielding connection and the point where the screen cloth is attached to the screen anchor.

Whatever vform of yielding connection employed between the side bars and screen anchors may be, any suitable vibration mechanism, such as electromagnetic vibrators I9, may be employed, and such vibrators may be connected to the screen at any desired point as at the center 20 (Figs. 2 and 5) or at the edges or corners of the screen as at 2| (Figs. 2 and 8).

It will be noted that the screen cloth is free to vibrate without vibrating the stationary side bars.

Whatever form of yielding connection between the side bars and screen anchors is employed,cover plates 22, 22 are secured to the interior side of each side bar I and extend down below the top of the screen anchors or extensions thereof.

It will be appreciated that by means of the construction herein described, there is provided means which yieldingly connect each of the screen anchors to its adjacent side bar, such yielding means taking the form of pivoted bars (Figs. 1 to 3), or other yielding hinge constructions (Figs. 4 to 6, inclusive), or the yielding bar construction (Figs. 7 to 10, inclusive), the essential eature being that when the screen is stretched by means of the tension springs 5 and set in vibration by any suitable vibrating mechanism, the screen support, to Wit, the screen anchors, are able to move freely and rapidly in an up and down direction so that the entire body of the screen cloth is subjected to practically uniform vibration. Furthermore, it will be observed thatthe mountings for the screen are not of such mass or weight as to deaden or materially influence the vibrations.

What is claimed is:

l. In a screen device, the combination of a pair o f oppositely disposed stationary side bars, screen anchors between said side bars, one adjacent each of said bars, said screen anchors each hav- A.

ing an extension member rigidly secured thereto, yielding connections between said extension members and said side bars and inclined upwardly .and inwardly from the side bars, ascreen cloth y 2. In a screen device, the combination of a pair 'of oppositely disposed side bars, screen anchors between said side bars, one adjacent each of said bars, said screen anchors each having an upwardly extending member rigidly secured there to, hinge connections between said extension,

members and said side bars and having members inclined vupwardly and inwardly from the side bars, a `screen cloth connected to the screen anchors, spring tension means pivoted to said extension members between said hinge connections and the screen cloth connections, and means vibrating the screen.

3. In a screen device, the combination ofl a pair of oppositely disposed side bars, screen anchors between said side bars, one adjacent each of said bars, said screen anchors each having an extension memberrigidly secured thereto, rocking bar connections between said extension members and said side bars and inclined upwardly and inwardly from theside bars, spring tension means pivoted to said extension members below said rocking bar connections, a screen cloth secured to and extending between the screen i anchors, and means vibrating the screen,

4. In a screen device, the combination of a pair of oppositely disposed stationary side bars, screen anchors between said side bars, one' adjacent each of said bars, said screen anchors each having an extension member rigidly secured thereto, yielding connections between said extension members and said side bars,l a screen cloth connected to the screen anchors, spring tension means pivoted to said extension members between said yielding connections and the screen cloth connections to the screen anchors, and means Vibrating the screen, relative tothe side bars and in a plane substantially normal to its surface.

5. In a screen device, the combination of a pair of oppositely disposed stationary side bars, screen ancho-rs between said side bars, one adjacent each of said bars, said screen anchors each having an. upwardly extending member rigidly secured thereto, hinge connections between said extension members and said side bars, a screen cloth connected to the screen anchors, spring ltension means pivoted to said extension members between said hinge connections and the screen cloth connections, and means vibrating the screen, relative to the side bars and in a plane substantially normal to its surface.

6. In a screen device, the combination ofl a pair of oppositely disposed stationary side bars, screen anchors between said side bars, one adjacent each of said bars, said screen anchors each having an extension member rigidly secured thereto, rocking bar connections between said extension members and said side bars, spring tension means pivoted to said extension members below said rocking bar connections, a screen cloth secured to and extending between the screen anchors, and means vibrating the screen, relative to the side bars and in a plane substantially normal to its surface.

7. In a screen device the combination of oppositely disposed stationary side bars, a screen cloth, screen cloth anchors adjacent each of. said side bars, yielding lconnecting bars extending longitudinally of the side bars along a line substantially parallel to said screen cloth anchors and forming yielding connections between said side bars and screen cloth anchors, yielding tension means pivotally connected tosaid screen cloth anchors between said screen cloth and said connecting bars and reacting against said side bars and putting th-e screen cloth under tension, and means vibrating the screen cloth, relative to the side bars and in a plane substantially normal to its surface.

MUNROE F. WARNER.

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