US890527A - Screening apparatus. - Google Patents

Description

PATENTEDHJUNE 9, 1908. E. HVNUTTER.

SCREENING APPARATUS. APPLICATION 11.31) my 11, 1907.

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" No. 890,527. I PATENTED JUNE 9,- 1908..

E NUTTER.

SCREENING APPARATUS.

APPLIUATION FILED MAY 11, 1907.

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WITNESSES INVENTOH W I A THE Nam-us PETERS :mfumsumnmu. D. c

EDWARD HOIT NUTTER, OF TELLURIDE, COLORADO.

SCREEN IN G APPARATUS.

Specification of Letters Patent.

Patented June 9, 1908.

Application filed May 11, 1907. Serial No. 373,024..

To all whom it may concern:

Be it known that I, EDWARD H. NUTTER, a citizen of the United States, and a resident of Telluride, in the county of San Miguel and State of Colorado, have invented a new and Improved Screening Apparatus, of which the following is a full, clear, and exact description.

This invention relates to screening apparatus, and it is particularly useful in connection with devices of this class used for the purpose of screening and separating crushed ores, broken stone, ground cement, and simi lar substances into grades of varying degrees of coarseness.

The object of the invention is to provide a simple, strong and efficient screenmg apparatus for separating crushed material, such as ores, stone and the like, into different grades, and for removing foreign substances from the crushed material.

A further object of the invention is to provide an apparatus of the class described, hav

ing a movable or a rigid screen and provided with means for forcing impulsive air currents or currents of other gases than air against said screen.

The invention consists in the construction and combination of parts to be more articularly described hereinafter and ful y set forth in the claims.

Reference is to be had to the accompanying drawings forming a part of this specification, in which,

Figure 1 is a vertical cross-section through a screening apparatus with my invention applied thereto Fig. 2 is a vertical cross-section of another form of the a paratus; and Fig. 3 is a similar view of still another form of my invention.

Like characters of reference designate cor responding parts in all the views.

Before proceeding to a more detailed explanation of the invention it should be understood that for the purpose of separating crushed ores and the like into varying grades corresponding to the degree of division, screens of wire or other suitable material are employed, which may be agitated to pass material of certain size therethrough, and against which currents of air may be forced for the same purpose. The material passing through the screen is known as under-size, while the material rejected by the screen is known as over-size. The arrangement is such that the over-size is rejected at the edge of the screen and is carried off by a receiving hopper or chute. To effect this purpose, the screen may be inclined to permit the undersize to slide along the same to the receiver, or the screen may be actuated to move the rejected material to the edge of the screen.

the belt when the same passes over the roller arranged above the over-size receiver. I employ means for forcing air against the screen'in my apparatus in an impulsive current, a reciprocating member directing alternate currents of air against the opposite sides ofthe screen in opposite directions. In this way the under-size is rapidly forced through the meshes of the screen, which tends to loosen particles of the material clinging to the screen and tending to choke the same.

Referring more particularly to the drawings, Fig. 1 represents a screening apparatus in which the screen is rotated in order to remove the over-size by means of centrifugal action. bers of the frame of the screen, carrying transverse members 2 and uprights 3 mounted upon the transverse members. Inclined braces 4 connect the transverse members and the uprights 3. A cylindrical casing 5 is mounted vertically upon the frame and has arranged therein a piston 6 provided with a pivoted piston-rod 7. The connecting rod 7 extends upwardly from the casing and has 1 are uprights or supporting memthe end mounted at a crank 8 of a transverse shaft 9 carried by the uprights 3, in suitable bearings 10 at their upper extremities. The shaft 9 has at one end a fly-wheel 11 and at the opposite end a sprocket 12. Underneath the transverse members 2 is a second shaft 13 carried in shaft bearings 14 and provided with a sprocket 15. The shaft 13 is substantially in alinement with the shaft 9 and has a pulley 16 by means of which it can be suitably belted to a prime mover. It will be understood that the screening apparatus can be operated by means of any preferable or common motive device. A chain 17 operatively connects the sprockets 12 and 15 so that when the shaft 13 is actuated, the shaft 19 is similarly actuated, thereby reci rocating the piston 6 within the cylindrical casing 5. A delivery hopper 18 is arranged at one of the uprights 3 adjacent to the cylindrical casing, and has a delivery spout 19 extending shaft 13 is actuated the shaft 20 is rotated within the casing. At its upper end the shaft 20 is provided with a head 23 upon which is mounted a circular screen 24 adapted to rotate within the cylindrical casing. Arranged at the side of the casing is an oversize receiver 24'" having an opening adapted to receive the over-size material thrown to the edge of the rotating screen by centrifugal action. A11 inclined annular flange 25 is mounted on the inner wall of the casing to receive material from the edge of the screen and direct the same to the receiver 24. Arranged underneath the screen and extending through the opening 26 in the wall of the easing is a chute 27 constituting an under-size receiver to receive the material passing through the meshes of the screen.

The'operation of the screening apparatus is as follows: The material to be separated or screened is thrown into the delivery hopper and passes down the delivery spout 19 upon the screen, the latter revolving rapidly, and under the influence of the agitation due to the revolution and the impulsive air currents forced by the piston 6 against the screen, the under-size material passes through the meshes of the wire and the over-size material is carried rapidly to the edges of the screen and passes into the over-size receiver and through the latter to suitable bins. Similarly, the under-size material falls upon the under-size receiver and passes from the same to other suitable bins.

In the modified form illustrated in Fig. 2,

' the screen is in the form of an endless belt 28 ed above the belt and has an outwardly flaring end 32 presenting an opening adjacent to the upper run of the belt; and under the upper run of the belt and below the opening of the cylindrical casing 31is an undersize receiver 33. The over-size material is carried away by the belt which moves in the direction indicated by the arrow and falls into an over-size receiver 34 arranged adj acent to the roller 29. A delivery hopper 35 is arranged adjacent to the casing 31 and has a deliveryspout 36 directed towards the belt near the opening of the casing. ithin the casing 31 a reciprocable piston 37 is provided for pulsating the air against the belt screen. The operation of this form of the device is similar to the operation of the form described before the air currents forcing the under-size through the meshes of the screen into the under-size receiver, while at the same time the meshes of the belt are prevented from clogging, owing to the impulsive nature of the air current. The belt itself, carries away the over-size material. The reciprocable piston '37 is operated from the screening mechanism which drives the rollers 29 and 30.

' further modified form is shown in Fig. 3 and comprises a cylindrical casing 38 having a reciprocable piston 39 which is operated in any preferable or common manner. A delivery hopper 40 is arranged adjacent to the casing 38 and has a delivery spout 41 discharging through a suitable opening in the Wall of the casing. An inclined screen 42 is rigidly mounted within the casing. An oversize receiver 43 extends from the casing at an edge of the screen through a suitable opening in the side of the casing. The over-size material falling upon the screen rolls down the same through the action of gravity and passes into the over-size receiver. An inclined under-size receiver 44 is mounted within the casing underneath the screen 42 and has a discharge spout 45 to permit the under-size material to pass from the casing. In this form of my invention the over-size is not removed from the screen mechanically, butsimply passes from the same under the influence of its gravitational action.

If so desired, I may employ a diaphragm in place of the piston for pulsating the air, or any other common or preferred means for this purpose, the principle of the invention remaining the same.

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

1. A device of the class described, comprising a screen, means for delivering material to the screen, and means for directing a series of intermittent air impulses against and through the screen from the upper side thereof.

2. A device of the class described, comprising a screen, means for delivering material to the screen, and means for directing a series of intermittent air impulses against and through the screen from the upper side thereof, said means comprising a cylinder at one end of which the screen is supported, a piston in the cylinder, and means for reciprocating the piston.

3. A device of the class described, comprising a movable screen, means for delivering material to the screen, and means-for directing a series of intermittent air impulses against and through the screen from the upper side thereof, said means comprising a cylinder at one end of which the screen is supported, a piston in the cylinder, and means for reciprocating the piston.

4. A device of the class described, comone end thereof, means for delivering mate- In testimony whereof I have signed my rial to the screen, means for rotating the name to this speclficatlon 1n the presence of screen, and means for directing a series of intwo subscribing W1tnesses.

termittent air impulses against and through EDl/VARD HOIT NUTTER. 5 the screen from the upper side thereof, said Witnesses:

means comprising a piston in the cylinder, WILLIAM F. HURLEY,

and means for reciprocating the piston. W. ROY EGHTERNAOH.

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