US1242982A - Screening device. - Google Patents

Description

2 SHEETSSHEET I.

Patented Oct. 16, 1917.

M. P. REYNOLDS.

SCREENING DEVICE.

APPLICATION FILEID OCT. 16. I916 INVENTOR WITNESSES M. PJREYNOLDS. SCREENING DEVICE.

APPLICATION FILED OCT-16.1916.

Patented 0m. 16, 1917.

2 SHEETS-SHEET 2.

WITNESSES nearer runsnoiv anrnonns, orctnvnnenn, onIo, assrenoa ro THE W. s. 'lYJL COANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

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terraces.

Patented wet. i6, 191%.

Application filed October 18, 1916. Serial No. 125,783.

To all whom it may concern Be it known that I, MORLEY PUNSHON REYNOLDS, a citizen of the United States, and resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented a new and useful Improvement in Screening Devices; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention pertains to automatically v1- brated screening devices, and relates especially to screens for. use in screening materials of a finely divided nature. It is the principal object of my invention to provide an automatically vibrated screening device, of such a nature that the vibrations imparted thereto will reach their maximum efficiency in performing the screening operation. It is another object of my inven-. tion to provlde a screening device in whlchv automatic feedin means are employed, and in which the fee ing means willoperate to distribute the material evenly over the screening surface. It is another object of my invention to improve generally upon screening devices of the kind in which the screen is disposed on a slope and the material is fed to the upper part thereof, so as to slide downward thereover during the screening operation. And other and further objects of my invention will appear from the following specification taken in connection with the claims appended thereto.

By way of example, I have shown in the accompanying drawings, and described in the following specification, one form of screening device constructed in accordance with my invention. It is to be understood,

' however, that my invention may be embodied in other forms, and that changes may be made in the form described and shown without exceeding the scopethereof, as do: fined in the appended claims.

In the drawings:

Figure 1 is a sectional side elevation, of a partly diagrammatic nature, showing a screening device constructed in accordance with my invention;

Fig. 2 is a front elevation of the same;

Fig. 3 is a front view of the device for vibrating the feed board;

Fig. 4 is a plan of one of the screens proper, with the device for vibrating the] same;

Fig. 5 is a plan of the screen and vibrating device;

Fig. 6 is an enlarged section taken on the line 6-6 of Fig. 5; V v Fig. 7 is a side'view of the screen shown in Fig. 4'; I

Fig. 8 is an enlarged section, taken on the line 88'of Fig. 4, looking in the direction of the arrows; and

Fig. 9 is an enlarged section taken through the lower cross bar of the screen frame, showing the means of attaching the screen cloth, the section being taken on the line 9 9 of Fig. 4.

Like reference characters refer to like parts throughout the following specification and several figures of the accompanying drawings, I

Referring now to the drawings, my improved screening device includes a casing, in which are mounted one or more automatically vibrated screens. Inthe drawing, two of such screens are shown; but a greater or lesser number may be used if desired. The

screens are alike, except that one is of a coarser mesh than the other; and the description of one of them, therefore, will suffice.

Each screen consists of a frame including a pair of side bars 10, preferably angle irons, and a pair of end bars 11 and 11, the same being connected at their corners by metallic braces 12, so as to form a rigid frame. To

' the upper end bar 11, is secured, by means of screws 13, a metallic strip 14. Between the strip 14 and the end bar 11 there is clamped the top edge of the screen cloth 15. The screen cloth 15 is of substantially the same width as the screen-frame, and extends to the lower end thereof. At such lower.

end, the screen cloth 15 is passed over a metallic bar 16, and is claimed against the latter by means of a strip 1?, bolts 18 being employed for the purpose. In order to provide' for stretching the screen cloth 15 lengthwise over the frame, and for adjusting the tension of such screen cloth, I provide a plurality of cap screws 19, which pass through the bar 16, and engage against Y I the end bar 11 of the'screen frame (Fig. 9).

By operating the cap screws 19, the tension of the screen cloth 15 maybe adjusted to the required degree; and, when properly adjusted, the cap screws may be secured in place by lock nuts 20.

At its center, the upper end bar 11 of the screen frame carries a spacin block 21, to which, in turn, is secured a vi rator bar 22. The vibrator bar 22 is of substantially the same length as, and extends parallel with, the top bar 11 of the screen frame; and it carries, near its ends, impact screws 23, the points of which likely engage the bar 11, near the ends thereof; The impact screws 23 are adjustable and are kept in their adjusted position by means of nut locks 24.

Mounted upon the vibrator bar 22, at the center thereof, is the core of an alternating current vibrator magnet. The core is laminated, being formed of a plurality of E- shaped plates 25, and upon its center arm is placed a winding 26, which is connected to a suitable source of alternating current, by means of conductors 27. Connected to the vibrator bar 22, with its ends intermediate the center and the end of said vibrator bar, is a yoke 28, which carries, at its center the magnet and armature 29, the latter being placed in proximity to the poles of the magnet ,core. It will be seen that, when alternating current is supplied to the core. 26 through the conductor 27, a series of alternating impulses, corresponding with the alternations of current, will act upon the armature 29, thereby causing the latter to vibrate rapidly. The vibrations of the armature 29 will be transmitted through the yoke 28, to the vibrator 22, and thus to the impact screws 23. The impact screws will thus perform a very rapid hammerin action upon the ends of the end bar 11 o the screen frame.

It is to be particularly observed that the vibrations, due to the hammering action of the impact screws 23 are imparted to the screen frame in the same plane as that which the screen cloth occupies. I have found that this results in vibrations to the screen cloth which are of an exceedingly efiicient nature,

in so far as the performance of the screening operation is concerned. It is to be noted, further, that the vibrations are imparted to the screen frame along a line which is substantially coincident with the line upon which the screen cloth is stretched. The re- 3, the casing, or housing, within which the screens, or screen, are mounted, includes a bottom 32 disposed at a comparatively steep angle, and a front 33, which is so disposed as to form, with the bottom 32, a funnel which will direct the screened material to a suitable delivery chute 34. Side walls 35, and a hinge cover 36, complete the main bod portion of the housing. Mounted in the housing are a pair of screens constructed as described above. provided with ascreen 010th of comparatively coarse mesh as is referred to, as a whole, as 37. The other screen, 38, is provided with a screen cloth of finer mesh, and is disposed below the screen 37 and parallel therewith. The housing front 33 is provided with a delivery-spout 39 for the tailings, and with a second delivery spout 40 for the intermediate material.

The screens 37 and 38 are both vibrated and the material is poured over thescreen 37 from the top. The coarse part of the screening operation is thus performed by the screen 37 and the finer screening by the screen 38. In this way the strain which would otherwise be imparted to the screen 38 is lessened, and the wear of the fine screen cloth of the latter is decreased.

The material to be screened is fed to the screen 37, by an automatic device. This automaticfeeding device includes a feed box having, at its lower part, an inclined feed board 41 from which the material can pour onto a chute board 42, which directs the material onto the screen 37. Extending across the feed box, within the latter, is a shaft 43, adapted to be continuously rotated by means of a pulley 44 which latter is connected to a suitable source of power. The shaft 43 carries a spiral convey'er 45, which operates to spread the material evenly over the feed board 41, so as to allow such material to.

pour off the board 41 as evenly as possible. In order to provide for the greatest possible uniformit in the pouring of the material from the feed board 41 to the chute board 42, I vibrate the feed board 41 by means of a device which is nearly similar to that employed for vibrating the screens. Such virating device includes a vibrator bar 46 having impact screws 47, which engage against the bottom of' the feed board 41, near the lower edge thereof. The vibrator bar 46 is vibrated by an alternating electromagnet 48. This magnet is similar in construction, and operates in a like way, to the magnet described above in connection with the screens, and further description is, therefore, not necessary.

In order to permit control of theamount of material flowing from the feed board 41 onto the chute 42 and thus to One of these screens is board 41 and can be used to increase or.decrease the amount of material pouring from said feed board, according as the gate is raised or lowered. The housing is provided with a hinged door 52, which permits inspection of the feed box and feed board, and it is also provided with a second hinged door 53, which permits inspection of the screens themselves.

The screening device described above has I manifold advantages. Among them is that it permits of an accurate and even feeding of the material to the screens, and allows the quantity of material fed to be properly controlled, in accordance with the nature of the material and the capacity of the screens. Another advantage is that the device is simple to construct and easy'to install, while it is very convenient in use, permitting observatlon and study of all the operations. Another, and a very important, advantage lies in the extreme high screening efliciency, due to the construction of the screens, and the manner of imparting the vibrations thereto.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A vibrating screen comprising a screen frame, a screen cloth attached at one end with respect to said frame, means for attaching the other end of said screen cloth with respect to said frame, said secondnamed attaching means being longitudinally adjustable, to permit variation of the tension of the screen cloth, a magnetic device for imparting high-speed vibrations to said frame, said device being arranged so as to impart such vibrations substantially in the plane of said screen cloth and in a line with the line of tension of said screen cloth, and said device and frame being immovably mounted with respect to each other, and auxiliary supporting means extending across said frame, beneath said screen cloth.

2. A vibrating screen comprising a screen frame, a screen cloth, means for attaching one end of said creen cloth with respect to said screen frame, means for attaching the other end of said screen cloth with respect to said screen frame, said second-named attaching means being constructed so as to permit adjustment of the tension of said screen cloth, a device for imparting high-speed vibrations to said screen frame said device being arranged so as toimpart such vibrations substantially in the plane of said screen cloth and in a line with the line of tension thereof, and said device and frame being immovably mounted with respect to each other, and auxiliary reticulate rigidifying means carried by said screen frame.

3. A vibrating screen comprising a rigidly constructed screen frame formed of resilient material, a screen cloth stretched upon said .screen frame, and means carried by said means and said support being immovably mounted with respect to each other.

5. Avibrating screen comprising a screen cloth, a support for said screen cloth, means for attaching one end ofsaid screen cloth to said support, means forattaching the other end of said screen cloth to said support, said second-named means. being adjustable to allow variation of the tension of said screen cloth, and a device for imparting relatively rapid vibrations to said support, said device being arranged so as to impart said vibrations substantially in the plane of said screen cloth, and in a line with the line of,

tension of said screen cloth, and said device and said support being immovable with respect to each other.

6. In a vibrating screen, a screen cloth, a support for said screen cloth, said support including means for adjusting the tension of said screen cloth, and a device carried by said support for impartlng vibrations thereto, said device being arranged so as to.

impart such vibrations substantially in the plane of saidscreen cloth and in a line wlth. the line of tension of said screen cloth.

loo

7. A vibrating screen comprising a sup port, a screen cloth stretched upon said sup-' port, and a device for imparting relatively rapid vibrations to said support substantially in the plane of said screen cloth,.said

. device and said support being immovably mounted with respect to each other.

8. In a vibrating screen, a rigidly constructed frame formed of resilient material, a screen cloth stretched upon said frame, and a device carried by said frame for imparting vibrations thereto substantially in the plane of said screen cloth.

9i In a vibrating screen, a screen frame, means for attaching a screen cloth to said frame, and a device for imparting vibrations to said screen frame substantially in the plane thereof, said device and said frame being immovably mounted with respect to each other.

10. In a vibrated screen, a screen cloth, means for stretching said screen cloth, and a device for imparting vibrations to said screen cloth substantially in the plane thereof, said device and said screen cloth being immovably mounted with respect to each other. I

11. In a vibrating screen, a screen cloth,

a support for said screencloth, and a device 30 for imparting vibrations to said screen cloth substantially in the plane thereof, said device and said screen cloth being immovably mounted with respect to each other.

12. In a vibrating screen, a screen frame, means, at one end of said frame for attaching one end of a screen cloth thereto, means, at the other end of said frame, for attaching the other end of said screen cloth thereto, said last named attaching means being adjustable to vary the tension of the screen cloth, and-a device for imparting vibrations to said frame, said device being arranged so as to impart such vibrations substantially in the plane of said frame, and substantially in the line of operation of said adjustable attaching means.

13. A screening device comprising a frame, a screen carried by said frame, a bar secured to said frame parallel with one end thereof,

thereof, the ends of said bar being free, ad-

justable means carried by the ends of said bar for striking said frame when said bar is vibrated, and electrical means for vibrating said bar.

In testimony whereof, I, the said MORLEY PUNSHON REYNOLDS have hereunto set my hand.

MORLEY PUNSHON REYNOLDS.

Witnesses FRED G. CURTIS, H. G. COATES.

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