US1610431A

US1610431A - Disk screen

Info

Publication number: US1610431A
Authority: US
Publication date: 1926-12-14
Anticipated expiration: 1943-12-14

Description

Dec. 14 1926.

w. L. DOLIER DISK SCREEN Filed Feb. 14. 1924 Shets-Sheet 1,

\ INVENTOR.

4' ATTORNEYS Dec. 14, 1926.

w. L. DOLIER DISK SCREEN Filed Feb. 14. 1924 2 Sheets-Sheet 2 ATTORNEYS Patented Dec. 14,1926.

UNITED STATES WILLIAM L. DOLIER, or PHILADELPHIA, PENNSYLVANIA PATENT' OFFICE.

DISK SCREEN.

Application filed February 14, 1924. Serial No. 692,640.

annexed drawings, in which Fig. 1 is a.-

partial plan view of a well-known type of screening apparatus, which I have adopted for purposes of illustration ofv my invention, such type of screen being more fully illustrated inthe patent'to Stevens 1,264,990,.

only part of such screening apparatus being shown in the. drawings with my present improvements embodied therein; Fig. 2 is an enlarged view of a portion of Fig. 1, showing particularly the construction of my improved screen plates, one of the plates being shown completely and another plate being shown with the screening Fig. 3 is a section of Fig. 2 on line 3-3, and Fig. 4 is a section on line {1-4 of Fig. 2.

Like reference characters indicate like parts in the different views.

In the type of screening apparatus illustrated, a rotary disk screen is swept by one or more brushes carried on arms rotating about a center outside of the screening surface. These screens are sometimes provided witha cone. In the illustrated embodiment, a portion of such disk screen is shown arranged to be rotated around a shaft 10, the

' cone portion 11 being shown more or less diagrammatically and the disk screen being supported by a plurality of arms 12 extending from a'hub 13 on the shaft 10. The supporting structure for the disk screen may comprise these arms 12 and a supporting a strip 14 and an outer circular member 15 the portion '15 extending having an angle section, the outer edge of somewhat beyond the screen plates. If desired, a binding and Wearing strip maybe supported over and outside of the screen sections on this extended-portion of the member 15. The cleaning brushes 16, in the form illustrated, are each mounted on a shaft 17 carried in arms 18, which arms are supported on and revolved by the shaft 19.. A fixed gear 20 engaged by pinions 21 on the shafts 17 serves to rotate the brushes 16 as they are-.revolved about the shaft 19. In the illustrative embodiment, the disk screen rotates counter clockwise as viewed in Fig. 1, and the brushes 16 are carried around the shaft 19-counter-- clockwise. The portion of the disk being carried toward the brush has just come from strlps removed;

the screening position and is therefore loaded with the'material to be removed from the screen.

The construction so far described is a usual one and further description thereof will be unnecessary.

Because of the curved path which each brush follows in passing across the disk (which curved path is made up of the motion of the disk as well as of the brush),

difiiculty has heretofore been experienced in arranging the screening slots of the disk' so as to insure their being brushes.

crosswise of the slots, thescreened material cleaned by the is liable to be forced into the slots to clog them. Onthe other hand, if the brush travels lengthwise of the screening slots, thebristles will remove the screened 'material from the slots and leave these slots clean and free before being carried into the screening position again by the further rotation of the disk.

By the arrangement shown in the drawings, I have provided a form of screening slot which permits a travel of the brush in relation to the slot, so that this travel will I be substantially parallel to the slot at all times, thus giving greater effectiveness in the cleaning operation. Furthermore, I have provided an arrangement by" which the separate sections of the screen plate may be Obviously if the brush travels conveniently built up so that the slots may be made of any desired'width and with any desired width between them, and, at the same time, a screen plate will be provided which is structurally strong enough to maintain its shape while in operation.

In the arrangement illustrated, I have formed the plates as shown best in Figs. 2 and 3. In this arrangement, a screen "plate frame is first formed by a side member 22 forming one side of the plate and amend member 23 forming the end ofthe plate, these members being conveniently connected by a corner stay 24: riveted to each of the members. Connected to the side member 22 by rivets or any other suitable fastening means, are cross strips 24' each having a foot bent at right-angles, through which the fasteningdevices may pass. Each of the side,

strips 24, as shown best in Fig. 3. If desired, the tops of the strips 25 may be flush with the tops of the strips 24.

With the arrangement just described, it will be obvious that the screening strips 25 may be made of very thin ribbons of metal and that such metal may be of any desired material, such as Monel metal, to give the necessary wear resistance to the brushes. Moreover, it will be obvious that these strips may be as thin as desired and placed as closely together as desired without weakening the structural strength of the plate, as would be the case if the same arrangement of slits were attempted to be placed in a solid cast or rolled plate. Moreover, in the event of accidental injury to a portion-of my novel plate, it may be readily repaired by the replacement of the damaged strips without necessitating discarding the entire late.

p While the'structure just described could be used in forming disk segments in which the slots extend radially or otherwise to the screen, I prefer to arrange them so that the slots will conform as nearly as possible to the curve of travel of the brush over the disk screen, as shown in Figs. 1 and 2. To that end, I first develop the curve of travel of the brush over the screen and select a center of curvature for the slots in each screen plate which will conform substantially to such curve. The slots in the segment frame are then formed with the same center of curvai ture, the side member 22 curved. to correspond to the curve of the opposite side of the next adjacent segment. By this arrangement, when all of the plates are assembled, the surface of the disk will be completely covered with the curved slots, the slots, however, being divided into groups, with each group struck from its own center of curvature. Preferably, I arrange the cross strips 24 so that they extend radially from the center of curvature of the slots, so that these cross strips extend at right-angles to the screening strips 25. WVhile, obvious- 1y, a second side member 22 could'be used to hold the outer ends of the cross strips 24, this is not necessary, since the cross strips are sufficiently rigid when supported as shown, and it is desirable to maintain unobstructed the maximum of an area of the screen.

The screen illustrated has a circular supporting strip 26 between the cone 11 and the outer member 15 and, in the form illustrated, I have anchored the screening plates to the strip 26. In the form illustrated, this anchoring is made up of a member 27 attached to the underside of the side member 22 and having a slot 28 into which projects a tongue orkey 29 of a member 30 attached to the strip 26. The slot 28 and the key 29 are formed in such a manner that a plate may be dropped into position and then moved s idewise to cause the key 29 to enter the slot 28. This may be done with each of the plates on the disk except the last and to fasten the last plate, I may provide a member 31 on the side member 22 and a locking member 32 fastened to the strip 26, the looking member 32 and the member 31 having abutting faces through which may be passed a taper pin 33., WVith the arrangement described, it is obvious that the plates may be removed by first taking out the pin 33 which will enable the plate to be lifted up and thereafter the next adjacent plate may be removed by sliding it sidewise to disengage the key 29 before the plate is removed.

The outer edge of the segments may be held as shown bestin Fig. 4. A circular groove, in the illustrative form, is formed in the edge of end member 23 and the wear and binding strip 23' has one edge in this groove, the strip itself being held to a distance piece 15 which is, in turn, attached to the circular member 15 of the frame of the screen.

By the arrangement described, the screen segments may be held to the screen frame without the use of screws passing through the segments The strip '23 may be made up of segments so that only one part of the strip need be removed in order to remove one of the screen segments.

It will be understood that the embodiment of my invention may be widely varied and that the form which I have shown is merely illustrative. It will also be understood that certain features of my invention may be used independently of other features.

I claim:

1. A flat rotary screen and a brush arranged to move bodily over the screen about a center outside the screen, said screen having screening slots positioned on the screen on an arc coinciding substantially with the path of travel of the brush over the rotating screen when the brush is contacting with a part of the screen moving toward the brush center.

2. A flat rotary screen and a brush arranged to move bodily over the screen about a center outside the screen, said screen having curved screening slots extending from the periphery toward the center of the screen.

3. A flat rotary screen and a brush arranged to move bodily over the screen about a center outside the screen, said screen having curved screening slots extending from the periphery toward the center of the screen, said slots being arranged in groups, with the slots in each group substantially parallel to each other.

4. A flat rotary screen and a brush arranged to move bodily over the screen about a center outside the screen, said screen having curved screening slots extending from the periphery toward the center of the screen, and each slot being continuous over the screening surface of the screen.

5. A fiat rotary screen and a brush arranged to move bodily over the screenabout a center outside the screen, said screen having curved screening slots extending from the periphery toward the center of the screen, said slots being arranged in groups, with the slots in each group substantially parallel to each other, and each slot being continuous over the screening surface of the screen.

6. Aflat rotary screen and a brush arranged. to move bodilyover the screen about a center outside the screen, said screen having curved screening slots, each slot forming an arc with its center outside the periphery of the screen.

7. A flat rotary screen and a brush arranged to move bodily over the screen about a center outside the screen, said screen hav ing curved screening slots, each slot being continuous over the screening surface of the screen. and forming an arc with its center outside the periphery of the screen.

8. A screen plate comprising a plurality of thin metal strips and a frame to hold said strips in spaced relation to form. screening slots therebetween, said strips being curved on a common center of curvature.

.9. A screen plate for a fiat rotary screen, comprising a plurallty of thln metal strips and a frame to hold said strips in spaced relation to form screening slots t-herebetween,

said frame comprising a main member extending from the periphery of the screen towards its center, and cross memberssubstantially at right-angles to said main member and having slots to receive said strips.

10. A screen plate for a flat rotary screen, comprising a plurality of thin metal strips and a frame to hold said strips in spaced relation to form screening slots therebetween, said frame comprising a main member extending from the periphery of the screen towards its center and curved on a circular arc, and crossmembers substantially at right angles to said main member and having slots to receive said strips, said strips being curved on arcs struck from a common center, the arc of said main member being struck from a center other than the common center of said strips.

11. A screen plate for a fiat rotary screen, comprising a plurality of thin metal strips and a frame to hold said strips in spaced re-.

lation to form screening slots therebetween, said frame comprising a main member extending from the periphery of the screen towards its center and curved on a circular arc, and cross members extending laterally to said main member and having slots to receive said strips, said strips being curved on arcs struck from a common center, the

are of saidmain member being struck from a center other than the common center of said strips, said cross members being free at their outer ends.

12. A screen plate for a flat rotary screen, comprising a plurality of thin metal strips and a frame to hold said strips in spaced relation to formf screening slots therebetween, said frame comprising a main member ex tending from the periphery of the screen towards its center and curved on a'circular are said strips being curved on arcs struck from a common center, the arc ofsaid main member being struck from a center other than the common center of said strips, and cross members connected at one end to said main member and extending beneath said strips and radial thereto and having slots to receive said strips.

13. A screen plate for a fiat rotary screen, comprising a plurality of thin metal strips and a frame to hold said strips in spaced relation to form screening slots therebetween, said frame comprising a main member extending from the periphery of the screen towards its center and curved on a circular arc, and cross members substantially at right-angles to said main member and having slots to receive said strips, said strips being curved on arcs struck from a common center, the arc of said main member being struck from a center other than the common center of said strips and positioned so that the plate is widest at the periphery of the screen.

14. A screen comprising a main supporting frame and a screening plate thereon, said plate having a key and slot connection to the main frame with the key and slot arranged to permit engagement ofthe key in the slot by amotionf of the plate parallel to the screening surface thereof.

15. A screen comprising a main supporting frame and a plurality of screening plates thereon, each plate comprising a frame having a main member extending from the periphery of the screen towards its center and cross members substantially at right-angles to said main member and a plurality of thin metal strips extending across said cross members and held in spaced relation thereon, said main member having a pin and slot connection to the main frame with the axis of the pin substantially parallel to the screening surface of the plate.

16. A disk screen comprising a circular supporting member, a screen plate having itsouter edge supported by said circular pair of plates being curved on arcs struck from the same center.

18. A fiat circular screen comprising a plurality of segmental plates positioned side by side around the screen, each side of each segment being curved on an are having its 1 center located outside the periphery of the screen and the two adjacent sides of each pair of plates being curved on arcs struck from the same center, each plate having a main frame member at one side and cross members substantially at right-angles to said main member and free at their outer ends,

19. A fiat circular screen comprising a plurality of segmental plates positioned side by side around the screen, each side of each segment being curved on an are having its center located outside the periphery of the screen and the two adjacent sides of each pair of plates being curved on arcs struck from the same center, each plate having a main framemember at one side and cross members substantially at right-angles to said main member and free at their outer ends,

and a plurality of thin metal strips extending across said cross members and held in spaced relation thereon. I

20. A flat circular screen comprising a plurality of segmental plates positioned side by side around the screen, each side of each segment being curved on an arc having its center located outside the periphery of the screen and the two adjacent sides of each pair of plates being'curved on arcs struck from the same center, each plate having a main frame member at one side and cross members substantially at right-angles to said main member and free at their outer ends, and a plurality of thin metal strips extending across said cross members and held in spaced relation thereon, each strip being curved on an-arc parallel to the arc of the side of the plate opposite said main member.

21. A screen plate comprising a frame having a plurality of spaced slots in its outer faceand a plurality of thin metal strips, each positioned in and held by said slots in spaced relation to the adjacent strips to form screening openings, the thin edges of the strips forming the outer face of the screen plate.

WILLIAM L. DOLIER.