US1651934A - Means for supporting vibrating screens - Google Patents

Description

Dec. 6, 1927. 1,651,934 A. J. SAYERS MEANS FOR SUPPORTING VIBRATING SCREENS Filed Feb. 21. 1925 2 Sheets-Sheet l Dec. 6,1927. v 1,651,934

A. J. SAYERS MEANS FOR SUPPORTING VIBRATING SCREENS Filed Feb. 21. 1925 2 $heets+Sheet awvwntpz Patented Dec. 6, 1927.

UNITED STATES ALBERT J. SAYERS,

OF CHICAGO, ILLINOIS, ASSIGNOR TO LINK-BELT COMPANY, OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MEANS FOR'SUPPORTING VIBRATING SCREENS.

Application filed February 21, 1925. Serial No. 10,741.

This invention relates, in a preferred form, to the use of coiled springs for suspending vibrating screens and has for its object the provision of coiled spring members for supporting the greater part of the screen load, to thus replace the heavy spiral sprmgsun part or whole. I further aim to provlde means which will overcome the tendency of the supporting spring leaves to sag and thereby reduce the efliciency of the unbalanced pulley, and whereby the screen v1- brates more easily with a minimum expendi ture of efiort. A further object includes the provision of simple and inexpensive means for supporting screens of large capacity so that the same spiral springs will serve in supporting the varied sizes of vibrating screens.

Other objects will appear hereinafter and I attain these objects by the construction exemplified in the accompanying drawings, in which 4 Fig. 1 is a side elevation of a vibrating screen to which my invention is applied.

Fig. 2 is a sectional view taken on the line 22 of Fig. 1.

Fig. 3 is a View showing the spring support applied from beneath.

Fig. 4 is a View of r'orm of construction wherein the spring is supplemented by counter weights.

Fig. 5 is a invention.

Like numerals refer to similar parts in the views.

It is found that the constant vibrations of the coiled spring leaves under heavy loads tends to sag the leaves so that the springs become sluggish and thereby the efficiency of the overbalanced pulley is destroyed. By the use of auxiliary supporting devices, as coiled springs or counter weights and equalizing means, the greater portion of the weight of a vibrating screen and load is sup- 1 ported thereby, thus permitting the use of larger vibrating screens and the handling of greater quantities of material on a single screen without the necessity of proportionally increasing the size and weight of the iral springs. Screens thus supported have greater freedom and most effectively respond to the overbalancing element. This. provision also permits the use of a. standard spiral spring for varying sizes of screens, thus i economizing in the manufacture as to the view of a modified form of my production of spiral springs for the varying efl'ective loads to be supported.

Referring now to the drawing, 10 denotes a screen box which may assume any variety of forms and is here provided with one or more screening cloths 1 1 and 12. These cloths are held stretched by stretching members 13 which in'this instance are shown in the form of beams held in position by bolts 14 and guides 15. Near each end of the screen box a supporting member or bar 16 is secured in the blocks 17 on the top beams 17 of the screen box 10. Collars 18 are shrunken on bars 16 near the ends and adjacent these collars the usual spiral springs 19 are fastened, in any suitable manner, as by weld-' ing. The outer leaves of the spiral springs are secured to housings 20, which in turn rest on the supporting beams 21. To the ends of bars- 16 are attached supporting links 22, which engage the spring members 23 or cables 36 and counter weights. These members constitute the auxiliary supports and are suspended from suitable beams 24. In place of the vertical springs cables 36 may be used. 80 These are attached to links 22 and pass over pulleys 35, thence to weights 36 or to a common horizontal spring 37, to thus supplement and relieve the spiral springs 19 for the purpose stated above. A turnbuckle 38 is provided to take up slack.

Instead of suspending the screen box and load as shown in Figs. 1 and 2, it may, in some instances, be desirable to support the same from beneath. I have shown one-way of accomplishing this method of support by use of a vertical spring 25 resting on a base 26 and secured to the bar 16 by a plate 27 asillustrated, for example, in Fig. 3. In either case do the auxiliary coiled spring members freely support the screen box, and when used in conjunction with the coiled springs, it will be unnecessary to provide heavy coiled springs for large screen boxes and heavy loads. With the use of myinvention, heavy spiral springs are not required. In fact, under certain conditions I may dispense with the use of the spiral springs entirely and rely solely upon the coiled springs. Screens thus suspended either with the combined coiled and spiral springs or with the coiled springs only, are caused to vibrate by an overbalanced pulley 30 which is secured in a frame 31 and this frame is fastened on to the top beams 17 of the screen 110 box 10. When the pulley is rotated at a high rate, the overbalanced effect is imparted to the screen box for screening materials in the manner known to the art. The greater freedom of movement due to the use of long coiled springs provides means also for operating the screens more efiiciently and with less wear and ear.

While I have shown a specific form of my invention, applied to a particular screening device, I do not thereby desire to be understood as thus limiting myself unduly.

What I claim, therefore, as new and useful, of my own invention and desire to secure by Letters Patent, is

1. In a vibrating screen, a screen box, means for vibrating said box, means for flexibly supporting said box, and auxiliary supporting means for maintaining said first named means supple, said supporting and auxiliary supporting means being positively connected together.

2. In a vibrating screen, a screen box, means for vibrating said box, \sprin members for supporting said box, and adc itional spring members for assisting in carrying the load and the screen box, said spring members being directl connected together.

3. In a vi rating screen, a screen box, means for vibrating said box, means for resilientlysupportin said screen box to freely impart vibrations t iereto, said means including long coiled springs cooperating with splral springs to maintain flexibility of said springs under varyin axes of the coiled an spiral springs being at right angles to each other.

4. In a vibratory screen, a screen box, means for vibrating said box, and coiled load conditions the springs for supporting said screen box to erm1t vibration thereof and resilient means or supporting all of said structure.

-5. In a vibratory screen, a screen box having screening means, an overbalanced pulley for vibrating said screen box and screening means, bar members carried by said box, spring members securedon said bar members near the ends thereof and auxiliary spring members attached to the bar members adjacent the ends thereof whereby the load on said first named spring members is relieved said auxiliary spring members supporting all of said structure.

6. In a vibratory screen, a screen box having screening means, an overbalanced pulley for vibrating said screen box and screening means, bar members carried by said box, spiral springs secured to said bars near the ends thereof encircling them, spring supporting anchors applied to the ends of said bars adjacent said spiral springs and spring members su ported byv said anchors.

7. In a vi ratory screen, a screen box having screening means, an overbalanced pulley for vibrating said screen box and screening means, bar members carried by said box, splral springs secured to said bars near the ends thereof, spring supporting anchors applied to the ends of sald bars adjacent said spiral sprin s, and coiled springs-supported by said anc ors for relieving said spiral springs, said coiled springs being arranged for supporting all of said structure.

In testimony whereof I have hereunto set w my hand on this 30thday of January, A. D., 1925.

ALBERT J. SAYERS.

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