US1705619A - Vibrating screen - Google Patents

Description

March 19, 1929. M, A, KENDALL 1,705,619

VIBRATING SCREEN Filed June 19, 1925 Patented Mar; 19, 19290 MYRON A. KENDALL, OF AURORA, ILLINOIS, ASSIGNOR TO STEPHENS-ADA118011 MFG.

PATENT OFFICE.

60., OF AURORA, ILLINOIS, A CORPORATION OF ILLINOIS.

vrsrmrrne soannn.

Application filed June 19, 1925. Serial No. 38,149.

This invention relates to screens, and more particularly to vibrating screens and means for operating the same.

One of the objects of the invention is the provision of new and improved means for resiliently mounting the screen and for angularly adjusting the same.

Another object of the invention is the provision of new and improved means and arrangement of parts for vibrating the screen.

A still further object of the invention is the provision of new and improved means for mounting the screen element in the screen frame together with new and improved means for properly tensioning the same.

Another object of the invention is the provision of a new and improved vibrating screen that is cheap to manufacture, easily assembled, elficient in operation, simple in construction, and one that is not likely to become broken or get out of order.

Other and further objects and advantages of the invention will appear from the following description taken. in connection with the accompanying drawings, in which Fig. 1 is a side elevation of the device with parts in section and parts broken away;

Fig. 2 is a section on the broken line 2-2 of Fig. 1, with parts broken away and parts removed; I

Fig. 3 is a section on line of Fig. 2;

Fig. 4 is a transverse section of a modified form of screen frame;

Fig. 5 is a perspective view of one of the unbalanced discs; and

Fig. 6 is a fragmentary view of a screen showing a still further. modified form of stretching means.

On the drawing the reference character 10 designates a suitable supporting frame which, for convenience of illustration, is shown as comprising the upright posts 11 to which are secured the side bars 12 and.

' end bars 13 for forming a rectangular memher on which the screen l tand operating mechanism 15 are'adapted to be mounted.

Suitable resilient means 'are provided for mounting the screen 14 on the side bars 12. It has been found by experiment that best results are obtained b employing leaf springs and arranging t e same longitudinally of the screen frame. As shown, a semi elliptic spring 16 is mounted on the side bar 12, at each side of the frame, as by-means of the perches 17 and shackles 18. A support 19 is rigidly connected to each spring 16 and extends upwardly therefrom. A base plate or bar 21 isrigidly connected to the upper ends of the supports 19 for supportlng the operating mechanism 15.

Suitable means are provided for adjustably connecting the screen 14' to the supports 19. In the form of the device selected to illustrate one embodiment of the invention the screen 14: is pivotally connected as at 22 to the supports 19. Preferably the pivot is located in the central transverse plane of the same. Curved slots 23 and 24 may be provided in the supports 19 which are adapted to be engaged by clamping bolts 25 carried by the screen for holding the same in angularly adjusted position.

In devices of this nature, it is the common practice to provide unbalanced rotating weights for vibrating the screen and to provide a motor or other mechanism independently of the weights for operating the same.

In the present device the motor is mounted above and vibrates with thescreen. This arrangement is considered an important feature of the invention. It greatly simplifies and cheapens the construction of the device. Since the screen frame may be r1gidly connected to the supports 19 in its adjusted position, the motor which is mounted on the supports ma be considered as being mounted on or rigi ly connected to the screen frame,

The operating mechanism 15 comprises a motor 26 having its armature shaft extended to each side thereof, on which are mounted unbalanced weights as the discs 27. These discs may be rendered unbalanced in the usual or any well-known manner. In the form shown they are concentric with the" shaft and portions of one side thereof are removed as by drilling holes 28 therein. .These ing corresponding plugs for varying their vibratory effect during rotatlon. The motor is rigidly connected'to the base plate 21 and is preferably arranged above the central holes maybe internally threaded for receivportion of the screen. For obtaining the est results the armature shaft is arranged longitudinally of the screen although it is understood it may be otherwise. It may, if desired be provided with a casing 29 for prl'iotecting the same from dust, dirt and the li e.

The screen comprises a rectangular screen frame formed by the side bars 31 and the end bars 32 rigidly connected together. A. side plate 33 is provided at each side of the screen for preventing the material from spilling or-escaping over the side edges of necting bars between the clamping plates 35 are employed.

In vibrating screens it is desirable that means he provided for preventing the sagging of the screen element during the operation of the machine. One form of means for stretching the same is disclosed in Fig. 2 and will now be described.

The side bars 31 of the screen frame are preferably in the form of angle barsfwith the horizontal flanges extended inwardly to form supports for the clamping plates 35. An angle bar 36 is attached to each side plate 33 to form an anchor for the stretching bar 37 The upper end of the stretching bar 37 is adapted to engage the flange of the angle bar 36 and its lower end is adapted to engage the upper clamping plate 35. The bolt 38 extending through the stretching bar and the side plate 33 is adapted to place the necessary tension on the wire mesh to cause it to operate to the best advantage.

In Fig. 4 is shown a modified form of mechanism for stretching the screen element. In this form of the device an angle bar 39 is rigidly connected to the side plate 33 adjacent to the side bar 31 and has its flange extending parallel with the horizontal flange of said bar. The stretching bar 41 is in the form of an angle with one flange slidably engaging beneath the flange of the angle bar 39 and the other engaging the upper of the clamping plates 35. The proper tension is placed on the element 34 by means of a bolt and nut' 42 which engage the stretching bar 41 and the side plate 33 as clearly shown in Fig. 4 of the drawings.

In Fig. 6 is shown a still further modified form of stretching means. In this form of the device a J-bolt 45 which-extends through the side plate 33 and engages the upper clamping plate 46, is employed for tensioning the screen 34. The angle bar 39 is moved down from the position shown in Fig. 4 so that it will engage the upper surface of the bolt 45 to prevent its upward movement, whereby the bolt will hold the clamping plates 46 and 47 downward against the flange of the angle bar 39. If desired, the clamping plate 46 may be provided on its inner edge withan undercut surface which is adapted to be engaged by the inner end of the J-bolt. only necessary to adjust the nut 48 on the bolt 45. e

In the operation of the device the screen may be adjusted to the proper angle by loosening the nuts on the bolts 25. The required tension may be 'placed on the screen element by the bolts 38 or 42. If desired one or more plugs may be inserted in the holes 28 for changing the relative vibration of the discs 27. i

It is thought from the foregoing taken in connection with the accompanying drawings that the construction and operation of my device will be apparent to those skilled in the art, and that various changes in size, shape, proportion and details of construction may be made without departing from the spirit and scope offthe appended claims.

I claim as my invention:

1. In combination, a screen frame, a' screen element secured across said frame, a support, means forang ularly adjustably mounting said frame on said support, a motor fixedly mounted on said support, and an unbalanced weight secured to the shaft of said motor for vibrating said frame.

2. In combination, a screen frame, a support for said frame, a screen element secured across the lower portion of said frame, means for angularly adjusting said screen frame on its support, an electric motor having an unbalanced weight on the armature shaft, and means for mounting said motor on said frame with the armature shaft extending parallel with the longitudinal axis 0; the frame and in the o 3. In combination, a screen frame, a supporting member for said frame, resilient means for supporting said member, means for pivotally mounting said frame on said supporting member to permit the same to rotate about its transverse axis independently'of said resilient means, means for securing said frame in adjusted position about said transverse axis, and means-fixedly mounted To tension the screen 34 it is verticalplane there- I on said support for vibrating said frame and support.

4. In a screen device, a support, a screen frame, a supporting frame, means for angular-1y adjusting said screen frame relative to said supporting frame, a leaf spring at each side of said supporting frame for supporting the said screen frame therefrom, said springs being arranged longitudinally of said screen frame, means mounted on said supporting frame for vibratingsaid screen frame, and means for angularly adjusting said screen frame relative to said springs.

5. In combination, a frame, a support, resilient. means for mounting said support on said frame, a motor fixedly mounted on said support, a screen adjustably mounted on said support between said motor and said resilient means, said motor being ro-' port and extending longitudinally thereof,

a support mounted on said springs, a screen frame mounted on said support and angularly adjustable about. its transverse axis, a motor rigidly mounted on said support and having its armature shaft extending longitudinally of said screen frame, an unbalanced weight on said shaft, and a screen element in said screen frame.

7 In a vibrating-screen mechanism, a supporting frame, a screen, a motor, means for angularly adjusting said screen on said frame independent of said motor, means for rigidly connecting said motor to said screen, and an unbalanced weightpn the armature shaft of said motor.

8.' In a vibrating screen} mechanism, a screen frame, a screen in said frame, means for flexibly supporting said screen frame in an inclined position, means for angularly adjusting said screen frame relative to said first-named means, a power shaft associated with said screen frame and extending in the direction of the inclined axis of said screen, and unbalanced weights on said-shaft for vibrating said screen when said shaft is rotated.

9. In a vibrating screen mechanism, a

screen frame comprlsing side and end walls,

a pair of angle bars attached to each side wall and having flanges extending inwardly of said frame, a screen, clamping plates secured to each side edge of said screen, said plates being slidably mounted on the lowermost of said flanges, and means including stretchin bars having their upper ends engaging eneath the uppermost of said flanges and having their lower ends engaging said clamping plates for stretching said screen.

In testimony whereof I aflix my signature;

MYRON KENDALL.

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