US1040251A

US1040251A - Ore-screen.

Info

Publication number: US1040251A
Application number: US62857411A
Authority: US
Inventors: Charles O Michaelsen
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-05-20
Filing date: 1911-05-20
Publication date: 1912-10-01
Anticipated expiration: 1929-10-01

Description

G. O. MIOHAELSEN.

ORE SCREEN.

APPLICATION FILED MAY 20,1911. 1,040,253 1 Patented Oct. 1, 1912.

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G. 0. MICHAELSEN.

ORE SCREEN.

APPLICATION rum) MAY 20,1911.

Patented Oct. I 1912.

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CHARLES O. MICHAELSEN, F OMAHA, NEBRASKA.

ORE-SCREEN.

Specification of L tt rs Pa n Patented Oct 1, 1912.

Application filed May 20, 1911. Serial No. 628,574.

Screens, of which the following is a specification.

My. invention relates to screening mechanism, and more particularly to screens for handling crushed ore and the like especiallyl in wet-processes where the crushed ore is mixedwith a sufficient quantity of water to make it flow.

It is the object of my invention to provide ascreen of this kind having means for causing a uniform distribution of the material over the screening surface, means for varying the area of the screening surface, and driving means for causing a rotary movement of the screen together with an interrupted,, oscillatory and jarring action thereon.

In the accompanying drawings, Figure 1 is a. longitudinal sectional view of a screen embodying my invention, Fig. 2 is a side elevation of the same, Fig. 3 is a transverse section thereof on the plane of the line a2--aa of Fig. 1, Fig. 4 is a detail elevation of the driving-gear interrupting devices, and Fig. v5.is a detail elevation of the driving gears showing the resilient gear with the cover-plate removed therefrom.

in carrying out my invention 1. provide cylindrical shells 1 and 2 which are mounted in axial alinement with each other on a tubular shaft 3. The adjacent ends of the shells. are open and the remote ends are closed by heads 4 which engage the shaft 3jt0 support said ends of the shells thereon. Adjoining the open ends of the shells are spiders. 5 which are mounted on the shaft 3 andconnectthe shells therewith. The shell 1 is secured fixedly on the shaft, and the :shell 2 is slidable longitudinally thereon.

Rods 6 are revolubly mounted in lugs secured on the outside of the shell 1, and said rods have threaded end portions 7 which are screwed through lugs secured on the shell 2. By. turning said rods the shell 2 may be movedilongitudinally upon the shaft to vary the space between the open ends of the shells. Acylindrical'screen 8 fits slidably over the outside of the shells at the open ends thereof and the ends of said screen are held upon the shells by means of the clamping-bands 9. The tubular shaft 3 is journalcd in bearings 10, 11 and 12 supported in the

bearing standards

13, 14 and 15, said standards being mounted upon a suitable base 16 placed at a slight incline from a horizontal plane. The bearing standards 14 and are extended above the bearings for the shaft 3 and carry at their upper ends suitable bearings for the driving-shaft 17. The shaft 3 is not extended entirely through the-bearing 12, and the front end portion of said hearing is used to support the feed-hopper 18 from which a pipe 19 is extended into the end of the tubular shaft, as shown in Fig. 1. Just inside the head 4 of the shell 1 a number of ports 20 are made in the shaft, through which the materials passing through the shaft from the feed-hopper may escape into the shell 1. Back of the ports 20 a plug 21 is placed to prevent the material passing through the shaft from going beyond the ports. A circular plate 22 is disposedwithin the shell 1 back of the ports 20 in the shaft so as to form in effect a chamber 23 between said plate and the head 4 into which the material is discharged from the ports. The plate 22 is mounted on the shaft so as to be slidable longitudinally thereon to vary the size of the chamber 23, and is provided with handles 24 by which it may be moved. The diameter of the plate 22 is such that a narrow annular opening is left between the periphery thereof and the shell, through which opening the material passes from the chamber 23 in a thin sheet.

In the shell 2 near the closed end thereof are made a number of ports 25, and plates 26 are adjustnbly secured on the shell adjoining said ports so that the width of the ports may be varied thereby. A suitable trough or chute 27 is disposed below the ports to receive the material discharged therefrom, and a similar trough or receiving device 28 is disposed below the screen 8 to receive the material which passes through the same. A ball tlnust-bearing 29 is arranged adjoining the bearing 1.0 to receive the end-thrust of the shaft due to the placing of the machine in an inclined position.

011 the driving-shaft 17 is a heavy ilywheel 30 which also serves as a pulley which may be connected by belt withn suitable source of power. A gear 31 is carried on the driving shaft and said gear meshes with a gear 32 which is mounted yieldably on the shaft 3. The said gear 32 is made in the form of a ring which fits rotat-ably upon a central body or hub 33 and between the plates 34 and 35 which are secured to said hub. On the inner side of the gear-ring are two or more lugs 36 which extend into pockets or recesses made in the hub-body as shown in Fig. 5, wherein the cover-plate 35 is removed. Each of said lugs 36 is engaged at one side by a coil spring 37 arranged in the recess, and is normally held by said spring in engagement with av block 38 of resilient material such as rubber disposed in the other end of the pocket. The direction of rotation of the gears is such that the lugs tend to move away from the resilient blocks 38 and to compress the springs 37. When the driving s-haft is moved at-a uniform rate of speed the-geared connection tends to move the screen-shaft 3 in a like manner and will do so unless the rotation thereof is sufliciently resisted to compress the springs 37. If, after the application of such resistance, the same be removed the springs will then move the shaft more rapidly than the gear 32 until the resilient blocks 38 strike the lugs 36. When such movement is made with sufficient rapidity the momentum of {the parts will also momentarily compress the resilient blocks so that expansion thereof to their normal thickness will give a second, but shorter, reversing or retarding of the movement of the shaft 3. Automatic means for causing at regular intervals such retardation and acceleration of movement of the screen-shaft are provided as follows: On the side ofthe gear 31 is a plate 39 which is secured to the gear by screws 40 passing through arcuate slots in the plate so that the relative positions of the plate and gear may be-adjusted. The plate 34 is similarly secured to the-hub-body 33. On the plate 39 are revolubly mounted rollers 41, and on the the said rollers 41 and 42 moving in interseating paths. By suitably adjusting the relation of the plate 39 and gear 31, and the relation of the plate 34 and hub-body 33, said rollers 41 and 42 are caused to interfere with each other during the rotation of the driving gears so that the screen-shaft is alternately retarded to compress the springs 37 and then released so as to permit its movement to be accelerated by the expansion of the springs. The rollers in .Fig.

4 are shown in the positions assumed at the beginning of the retarding action.

From the foregoing the operation of the machine will be apparent. When in use the screen-cylinder is revolved with an alternately retarded and accelerated movement which causes a jerking pulsating and scouring action upon the material passing through the cylinder. The material from plate 34 are mounted similar rollers 42,,

into the shell near the feed-hopper passing through the tubular shaft and the ports 20 into the chamber 23 is caused by the plate 22 to be distributed tinues to move along the cylinder and is discharged through the ports 25. According to the material operated upon, a greater or less area of screen surface may be de sired and this is obtained by varying the distance between the open ends of the shells 1 and 2, as described.

The interrupted drive gearing, herein shown and described, is specifically claimed 1n my application for patent thereon, Serial N o 642,216, divided herefrom and filed August 3, 1911.

Now, having described my invention, what I claim cut is:

1. In an ore-screen, a pair of cylindrical shells revolubly mounted in axial alinement with each other, a cylindrical screen connecting the adjacent ends of the shells, means for varying the distance between the ends of the shells, and means for feeding materials into one of the shells.

2. In an ore-screen, a pair of cylindrical .shells, a revoluble inclined tubular shaft on which the shells are varying the distance between the adjacent ends of the shells, a cylindrical screen fitting slidably on said adjacent ends of the shells, and means for feeding materials into the tubular shaft, there being ports to admit the materials from the shaft into one of the shells, and openings in the other shell for mounted, means for the discharge of the materials which pass across the screen.

3. In an ore-screen,

a tubular shaft, a pair of cylindrical shells mounted on said shaft 'and having adjacent open ends and remote closed ends, a screen fitting around the adj acent ends of the shells, means for feeding .material into the tubular shaft, said shaft having ports for discharging such material into one. of the shells near the closed end thereof, and a circular distributing-plate disposed between said ports and the open end of said shell.

4. In an ore-screen, a revoluble cylindrical shell having a closed end and an open end, a cylindrical screen arranged upon the open end of the shell, means for feeding materials theclosed end thereof, and a circular plate adjustably disposed within the shell and arranged to form betwee" the same and the shell a narrow annular opening through which the materials must pass in moving toward the screen.

5. In an ore-screen, a pair of cylindrical and desire to secure byLet-ters Pat-' revolubly mounted shells having open adjacent ends, adjusting means for varying the distance between'said open ends of the shells, a cylindricalscreen fitting slidably over the shells and bridging the space between the open ends thereof, means for feedin materials into one of the shells, means I01 distributing said materials before the same pass onto the screen, there being discharge ports in the other shell, and means for varying the area of said ports.

6. In an ore screen, a pair of cylindrical shells, a revoluble inclined tubular shaft on which the shells are mounted, means for varyin the distance between the adjacent ends 0 the shells, a cylindrical screen fitting slidably on said adjacent ends of the shells, means for feeding materials into the tubular shaft, there being orts to admit the materials from the sha t into one of the shells, and openings in the other shell for the discharge of the materials which pass across the screen, and means for imparting to the tubular shaft an alternately retarded and accelerated rotary movement.

7. In an ore screen, a tubular shaft, a air of cylindrical shells mounted on said s aft and having adjacent open ends and remote closed ends, a screen fitting around the adjacent ends of the shells, means for feeding materials into the tubular shaft, said shaft having ports for discharging such materials into one of the shells near the closed end thereof, a circular distributing-plate disposed between said ports and the open end of the shell, and means for actuating the shells with an interrupted-rotary movement.

8. In an ore screen, arevoluble cylindrical shell having a closed end and an open end, a cylindrical screen arranged upon the open end of the shell, means for feeding materials into the shell near the closed end thereof, a circular plate adj ustably disposed within the shell and arranged to form between the same and the shell a narrow annular opening through which the materials must pass in moving toward the screen, and actuating means connected with the shell and adapted to revolve the same interruptedly.

9. In an ore screen, a pair'of cylindrical revolubly mounted shells having open adj acent ends, adjusting means for varying the distance between said open ends of the shells, a cylindrical screen fitting slidably over the shells and bridging the s ace between the open ends thereof, means or feedin mate- 'rials into one of the shells, means for distributing said materials before the same pass onto the screen, there being discharge ports in the other shell, means for varying the area of said ports, and actuating means connected with the shells and adapted to revolve the same interruptedly.

In testimony whereof I have hereunto subscribed my name in the presence of two witnesses. Y

CHARLES O. MICHAELSEN. Witnesses:

D. O. BABNELL, J. E. Trrus.