US583216A

US583216A - Screen

Info

Publication number: US583216A
Authority: US
Publication date: 1897-05-25
Anticipated expiration: 1914-05-25

Description

2 Sheets-Sheet 1.

(No Model.)

D. E. PHILLIPS.

SCREEN.

No. 583,216. Patented May 25,1897.

ls PETERS co. Pnm'aumo.. WASHINGTON, n. c.

(No Model.) 2 Sheets-Sheet 2.

D. E. PHILLIPS. SCREEN.

No. 583,216., Patented May 25, 1897.

UNITED STATES PATENT QEEICE.

DAVID E. PHILLIPS, OF MAHAN OY CITY, PENNSYLVANIA.

SCREEN.

SPECIFICATION forming part of Letters Patent N0. 583,216, dated May 25, 1897.

Application iiled March l, 1897. Serial No. 625,495. (No model.)

To all whom it may con/cern:

Be it known that l, DAVID E. PHILLIPS, of Mahanoy City, in the county of Schuylkill and State of Pennsylvania., have invented an Improvementin Screens, ot which the following' description, in connection with the accompanying drawings, is a specification, like letters and figures on the drawings representing like parts.

This invention relates particularly to revolving screens employed in screening coal, dto., and has for its object the production of strong, simple, and durable means for tumbling the material treated as the screen rotates, the screen-segments being connected and held in place in a novel and eii'ective manner. v

Coal-screens arc subjected to very hard and rough usage and the protector or tumbler 2o plates are put to great strain, so that to be durable and also to prevent opening` of the joints the protectors must be very strong.

I prefer to construct the screen-segments of suitably-punched sheet metal, connecting the z5 longitudinal edges of the segments by lapjoints, the annular spiders or rings supporting the ends of the segments. At or near one of the longitudinal edges the metal of each segment is bent up or inturned, except at the 3o immediate ends, or a series of such inturned portions are provided, such bent portion stiffening the segment and also acting as a tumbler to resist the sliding action of the material being screened. The longitudinal edge 3 5 of the adjacent segment is extended beneath the edge of the first segment having the inturned portion or portions, and means are provided on one segment to engage the edge of the next segment to prevent the sliding 4o movement or tendency between them, thereby obviating the shearing strain on the bolts or rivets which connect the overlapping edges. Figure l isfa longitudinal section of the screen, centrally broken out and taken on the line a: x, Fig. 2. Fig. 2 is a transverse enlarged sectional view on the line .r/ zo', Fig. l. Fig. 3 is an enlarged perspective view of portions of two adjacent segments, showing the overlapping joint and the tumbler. Fig. 4 is 5o a similar view of a modification to be described, and Fig. 5 is a like view showing a plurality of inturned portions at or near the edge of one of the segments forming a noncontinuous tumbler.

The screen is shown as composed of sections, each section in turn being composed of curved screen-segments A, supported at their ends by circular spiders or heads B, secured to a shaft B', rotatably mounted in suitable fixed bearings B2 B3, the screen being inclined to facilitate the passage of the coal or other material along the screen. A feed-chute B4 delivers the material at the upper end of the screen, and it is discharged from the lower end thereof.

The screen-segments A are made of sheetmetal plates, suitably punched to provide the desired perforations a, the ends a/ and the longitudinal edges being imperforate. Each segment is cut away at its ends at one longitudinal edge, as at a2, Figs. l, 3, and 4, to leave an extended portion a3, which latter is bent up or inwardly to form a longitudinal rib c4, substantially at right angles to the main portion of the part a3. The longitudinal edge of the adjacent segmentis extended beneath the extended portion a3, and the longitudinal imperforate portions of the segments are rigidly connected by bolts or rivets Zi, while the imperforate ends of the segments are secured, as by bolts h', to the spiders or heads B. The inner segment is struck up, as shown in Fig. 3, to form stops d5, turned out or projecting from its outer surface to abut against the edge l2 of the adjacent segment, thus preventing one segment from moving over and toward the other segment, thereby obviating to a great degree shearing strain on the connecting-bolts b.

In Fig. Il the segment A3 is upturned at am to form the tumbler, and the outer segment AX is cut and bent inwardly at d to leave projections on the inner side of the segment, said projections engaging the upturned rib @40 of the adjacent segment A3. The extended portion a3 of the inner segment overlaps the longitudinal edge of the adjacent segment in either case, protecting the joint or seam between them.

In Fig. 2 the direction of rotation of the screen is indicated by the arrow 8, the material being carried up by the ribs a* and resting on the adjacent portion c3 of the segment.

In Fig. 5 a plurality of portions fare struck IOO up near one longitudinal edge of the segment A to form an interrupted or non-continuous tumbler, while stop-portions f are struck up to turn out or project from the outer surface of the segment to abut against the edge of the adjacent segment A12.

Preferably the stops are staggered with relation to the portions f of the tumbler, and in this instance the segment is not cut away at its ends, as in the other forms shown.

It will be noted that the spaces below the struck-up or inturned portions f are covered by the edge of the adjacent segment, and, if desired, the series of portions f of one tumbler may be arranged opposite the spaces between the portions forming the next tumbler.

Having fully described my invention, what I claim, and desire to secure by Letters Patent, is-

l. In a rotatable screen, perforated screensegments supported at their ends and having their longitudinal edges overlapped and secured together, the longitudinal edge of the inner segment having one or more inturned portions above the adjacent segment, and stops on one segment to engage the adjacent segment and preventy relative sliding movement of the segments, substantially as described.

2. In a rotatable screen, perforated screensegments supported at their ends and overlapped at their longitudinal edges, the inner segment being provided at or near its overlapping edge with one or more portions bent inward above the adjacent segment to form a tumbler, and meansintegral with one segment to be engaged by and serve as a stop for the adjacent segment, substantially as described.

3. In a rotatable screen, perforated screensegments supported at their ends and overlapped at their longitudinal edges, the overlapping edge of the inner segment being bent inward above the adjacent segment to form a tumbler, and integral stops projecting from the surface of one segment to engage the adjacent segment and prevent relative sliding movement of the segments, substantially as described.

4. A sheet-metal screen-segment having a perforated body and imperforate ends and longitudinal edges, one of the longitudinal edges thereof being bent up at one or more portions to form a tumbler, and integral stops projecting from the surface of the segment, to engage and hold an adjacent segment, substantially as described.

5. A sheet-metal screen-segment having a perforated body and imperforate ends, one of i the longitudinal edges thereof being bent inward at separated portions to form a noncontinuous tumbler, and bent outwardly to form integral stops projecting from the surface of the segment, to engage and hold the edge of an adjacent segment, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DAVID E. PHILLIPS.

Iitnessesz JOHN B. DAvIns, D. C. T. XVATKINS.