US599468A - cross - Google Patents

cross Download PDF

Info

Publication number
US599468A
US599468A US599468DA US599468A US 599468 A US599468 A US 599468A US 599468D A US599468D A US 599468DA US 599468 A US599468 A US 599468A
Authority
US
United States
Prior art keywords
screen
segment
lips
segments
material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Publication date
Application granted granted Critical
Publication of US599468A publication Critical patent/US599468A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPERATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, OR SIFTING OR BY USING GAS CURRENTS; OTHER SEPARATING BY DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/469Perforated sheet-like material

Description

ode

Aeet:

eet

C SGREEEIOSS' 'TUTmG-T D( o' ce 0l ceco n( oe e600 u 90000000 D 000000 000 o 000000000000 o o 00000000000 o 000050 000000000 o OOQODQODOOOQDOQDCQ o eneooooooeeooeooeone 1 e 00000 0000000000000000 1 a e ODQDUUOOOOOOOOGDUGB 0000 e econo wwoooooeeogooes o oneven 0000000000000 o0 9000 o Bao0900004100000000001000000000 o 080000000!!170000021000600000000000 n oooeeeonobbooeeooo 01.900900000000000 D eooeooooaea000000000000000000000000 o( t,e9000000000000000@ 000000000000000090 o 000000000000000 000D 00000 000000005090 o 0000000090 0000 o 0000.900210 0000 00000000060 00004 oboocooono 0000 al o 000000000 0000 5 ooe ooobo 9090 oso el,00600 6000 00000900 0 00000 0000 89000000 :0000 .0000 nobeleo :o e113 .eeen 0080959 0 90 50069 o 005000 50 000 B600 006000009 00 00041` 080090040 00 0000 oseeoeoooooe sono o000000000 e000 Delloe000 0000 000000 no n06 lf o 'CD z L A2 Sheets Sheetl 2.

(No Model.)

SCREEN.

Patented Feb. 22, 1898. /z-f-:7 '(13 ms uonms Pzzns co. 0104 man, wAsmNsTuN, n. c.

` Nrrnn STATES ATnNr rricn@ SCREEN.

SPECIFICATION forming part of Letters Patent No. 599,468, dated February 22, 18198.

Application filed August 3, 1896. Serial No. 601,429. (No model.)

To all who/n it may concern:

Be it known that I, GEORGE YV. CROSS, a citizen of the United States, residing at Pittston, in the county of Luzerne and State of Pennsylvania, have invented a certain new and useful Improvement in Screens, of which the following is a specification.

The present invention concerns the construction of screening-surfaces, and is directed particularly to that type of screens adapted for the separation of coal, ore, stone, &c., known as revoluble screens, in which the screening-surface is cylindrical in form, the material being fed to the interior thereof and passed over the screening-surface or mesh. As is well known, in this type of apparatus were the interior of the cylinder smooth the material would pass therethrough at considerable speed, governed largely by the pitch of the screen, and owing to the velocity of its travel particles of such size as to be capable of passing through certain perforations would travel over the same and become mixed with particles of a larger size designed to pass through larger perforations toward the lower end of the screen. Means are therefore commonly employed for tumbling or agitating the material in its passage through the screen-such for instance, as an angle-iron bolted or otherwise secured to the margins of the segments of which the screen surface or jacket is composed. Another structure designed for this purpose consists of flanges on the margins of segments. I have found that in practice it is highly desirable not only to tumble or agitate the material in its passage through the screen, but also to deflect it, so that while such material is passing over one round of screen-segments it will be deflected from a straight or spiral line of travel and at once agitated and thrown back at an angle to such line of travel, so as to guard against failure to separate particles designed to be screened in that round of segments. Thus if the first round of segments upon a revoluble screen were provided with a three-quarterinch mesh particles of `such size as to pass through such mesh might in the absence of suitable provision therefor ride upon larger particles and thereby be prevented from being separated from the mass. In the construction contemplated by this invention,

however, the mass after passing over the surface of each segmentis agitated and deflected or turned back from its line of travel, so that it passes over a greater area of screening-surface, and the mass being tumbled and more or less distributed the particles designed to be screened upon that round are thrown directly upon the screening-surface. In accomplishing this object I employ a series of screen-segments in combination with deflecting-lips. These lips are separated and turned inwardly toward the longitudinal axis of the screen. In practice the material after passing over the mesh of one segment is caught by these inwardly-proj ecting lips, and by reason of their curvature and relativity to the line of travel of the material the latter is turned backward against the pitch of the screen, thereby permitting it to again pass over a portion of the mesh of similar size of thenextadjacentscreen-segment. Theselips operate not only to deflect and turn back the material, but also to agitate or tumble it, so

as to preclude the sliding motion of the mass of material being separated, which results in the imperfect sizing of the particles.

The invention is illustrated in the accompanying drawings, in which- Figure l is a plan view of a screen-segment employing my invention. Fig. 2 is a similar View of a portion of the screen-segment, illustrating a slightly different construction of the lips. Figs. 3 ande are detail perspectives of a portion of the structures shown, respectively, in Figs. l and 2. Figs. 5 and 6 illustrate modiiications hereinafter to be described. Fig. 7 is a sectional view of a portion of one round of screen-segments, illustrating the relation of two segments to each other when in position upon the screen-frame; and Fig. 8 is an end view of a screen made up of segments employing the inventiont Referring to the drawings, in which similar letters of reference denote corresponding parts, A designates a screen-segment. This is preferably constructed of sheet-steel. It is provided with a perforated screen-surface a and with imperforate side margins a' and end margins a2. The end margins may be provided with holes a for the reception of bolts, by means of which the segment may be secured to the spider-bands of the screen and the IOO side margins with similar holes a4 a5, by means of which each segment may, if desired, be secured to the edges of the two adjoining segments. The perforations a may be of any desired shape, and, if desired, the Webs surrounding them may be curved or crimped.7 In all these structures save those illustrated in Figs. 5 and 6 the deflecting medium is shown as formed integral with the segment. I shall first describe this construction. The segment as a whole is, as before stated, curved to the arc of the circle, so that a certain number of them (depending upon the diameter of the screen) may constitute one round -that is to say, one section-of the cylinder. One edge of the segment instead of terminating in a straight narrow imperforate margin Vis bent inwardly at B on a straight line coinciding with one end of the end margins, so as to form a shoulder b. This permits the level margin of the next adjacent segment to fit snugly against the exterior of the shoulder, and where such margin is perforated a bolt may be passed through the perforation 0.5 of one segment and through the perforation a4 of the next adjacent segment and provided with a nut or other means for holding both segments in their proper relative positions.

B designates a series of deflecting-lips. In the structure now being described these are integral with the segments. In practice it has been found desirable to form the whole segment from a plate of sheet-steel, one side of the segment being provided with an imperforate margin considerably wider than that upon the other side, and from this wider margin the lips may be cut and struck up. In the construction illustrated in Fig. l the lips are separated by recesses b, cut out of the wide margin. Each lip is then struck up at its outer edge, so that its end shall project inwardly, and this struck-up portion presents somewhat the appearance of a shelf pitched in the direction opposite to that of the pitch of the whole screen. Thus in the construction illustrated the right end of the segment is the higher. The material therefore would travel from that end toward the opposite end. When caught, however, bythe inwardly-projecting lips B', it would be deflected from this line of travel and turned in the opposite direction over the surface of the next adjacent screen.

The object in separating the lips B by the recesses b', Figs. l and 3, is to avoid the choking of said lips by large particles of the material being screened.` Where the screen is designed to receive small particles, however, these recesses may be omitted, as in Figs. 2 and 4.

It is not essential that the deflecting-lips be formed integral with the screening-surface, as I may, if desired, make them separate therefrom and capable of attachment thereto by bolts, rivets, or other suitable means. Where such a construction is employed, the

segments may be either butt-jointed, as shown in Fig. 5, or lapped, as shown in Fig. 6.

I regard the feature of deiiecting the material from its line of travel and throwing it back upon the surface of other screen-segments in the same round as of great importance. Thishasnotbeen accomplishedbythe so-called tumblers heretofore employed, the action of which at best has been to tumble or agitate the material along straight lines extending across each round of segments.

In a screen provided by the construction above described the material is of course separated to a considerable extent while passing over the mesh. Vhen, owing to the revolution of the screen, the mass is caught by the inturned lips and deflected or turned back over a portion of the next adjacent segment, this material is again passed over a mesh of the same size, and such particles as escaped separation during the passage of the mass over the first segment are separated during the subsequent passage of the mass over the -next segment or segments.

I do not desire to limit myself to the use of deiiecting media in any particular location upon the segment or screen-jacket, as I may, if desired, place such deliecting media in the body of the mesh.

Having now described the invention, what I desire to secure by Letters Patent isl. As anew article of man ufacture,a screensegment having inturned, inclined separated lips along one edge,substanti ally as described.

2. A screen-segment curved inwardly near one edge to form a shoulder and provided with inturned, separated, inclined lips, substantially as described.

3. An inclined revoluble screen provided with a perforated segment having internal lips pitched in a direction opposed to the general pit-ch or incline of the screen, substantially as described.

'4a. An inclined revoluble screen provided with a perforated segment having internal, separated lips pitched in a direction opposed to the general pitch or incline of the screen, substantially as described.

5. A screening-surface having imperforate margins, one of said margins being curved inwardly to form a shoulder and provided with inturned separated lips, substantially as described.

6. A screening-surface having imperforate margins, one of said margins being curved inwardly to form a shoulder and provided with inturned separated lips, said lips being pitched in a Idirection opposite to the pitch of the screen upon which such segment is mounted, substantially as set forth.

This specification signed and witnessed this 31st day of July, 1896.

GEORGE W. CROSS.

Witnesses:

L. M. SMITH, p W. T. OoLvILLE.

IIO

US599468D cross Expired - Lifetime US599468A (en)

Publications (1)

Publication Number Publication Date
US599468A true US599468A (en) 1898-02-22

Family

ID=2668109

Family Applications (1)

Application Number Title Priority Date Filing Date
US599468D Expired - Lifetime US599468A (en) cross

Country Status (1)

Country Link
US (1) US599468A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963605A (en) * 1974-03-14 1976-06-15 Phillips Petroleum Company Coated shaker screen apparatus and method
US6283302B1 (en) * 1993-08-12 2001-09-04 Tuboscope I/P, Inc. Unibody screen structure
US6601709B2 (en) 1999-09-03 2003-08-05 Tuboscope I/P, Inc. Screen support and screens for shale shakers
US6662952B2 (en) 2002-01-16 2003-12-16 Varco I/P, Inc. Shale shakers and screens for them
US20050103689A1 (en) * 2001-10-19 2005-05-19 Schulte David L.Jr. Sealing screen assemblies and vibratory separators
US20050224398A1 (en) * 2001-10-19 2005-10-13 Largent David W Vibratory separators and sealing screens
US9079222B2 (en) 2008-10-10 2015-07-14 National Oilwell Varco, L.P. Shale shaker
US9643111B2 (en) 2013-03-08 2017-05-09 National Oilwell Varco, L.P. Vector maximizing screen

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963605A (en) * 1974-03-14 1976-06-15 Phillips Petroleum Company Coated shaker screen apparatus and method
US6530483B2 (en) 1993-04-30 2003-03-11 Varco I/P, Inc. Unibody structure for screen assembly
US6892888B2 (en) 1993-04-30 2005-05-17 Varco I/P, Inc. Screen with unibody structure
US20050236305A1 (en) * 1993-04-30 2005-10-27 Schulte David L Jr Vibratory separators and screens for them
US6283302B1 (en) * 1993-08-12 2001-09-04 Tuboscope I/P, Inc. Unibody screen structure
US6601709B2 (en) 1999-09-03 2003-08-05 Tuboscope I/P, Inc. Screen support and screens for shale shakers
US20050103689A1 (en) * 2001-10-19 2005-05-19 Schulte David L.Jr. Sealing screen assemblies and vibratory separators
US20050224398A1 (en) * 2001-10-19 2005-10-13 Largent David W Vibratory separators and sealing screens
US6662952B2 (en) 2002-01-16 2003-12-16 Varco I/P, Inc. Shale shakers and screens for them
US9079222B2 (en) 2008-10-10 2015-07-14 National Oilwell Varco, L.P. Shale shaker
US9643111B2 (en) 2013-03-08 2017-05-09 National Oilwell Varco, L.P. Vector maximizing screen

Similar Documents

Publication Publication Date Title
US5526988A (en) Comminuting apparatus with tangentially directed discharge
US2835173A (en) Paper machinery
US3561605A (en) Self-cleaning tubular screen
US3245535A (en) Vertical pressure type pulp screen
US1872036A (en) Grinding mill
US5593043A (en) Rotor for mechanical air classifiers
US3040888A (en) Classifier for pulverized substances
US3630379A (en) Step ring centrifuge screen
EP0379185B1 (en) Drum screen for screening waste or the like
EP1055460A1 (en) Triboelectrification device
US2998137A (en) Centrifugal screen
US622035A (en) Revolving eccentric screen
US2215226A (en) Louver plate screen for mills
US335827A (en) Pulverizer
US2155587A (en) Machine for separating solid materials
US630468A (en) Lawn-sprinkler.
US3508650A (en) Cover members for fasteners in screen plate assemblies
US1766340A (en) Roller grizzly
US3145165A (en) Pulp screens
US713787A (en) Pneumatic stacker.
US1420685A (en) Revolving screen or grizzly
US2855099A (en) Apparatus for wet screening
DE10022536A1 (en) mill classifier
US639406A (en) Disintegrator.
US6216875B1 (en) Vibrating screener