US 1193273 A
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Description (OCR text may contain errors)
J. L. LEE.
APPLICATION FILED MAR. n, 1916.
3 Patented Aug. 1, 1916.
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J. L. LEE.
APPLICATION FILED MAR. 11. 1916.
Paterited Aug. 1,1916.
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JOSEPH L. LEE, OF CARBONDALE, PENNSYLVANIA.
Specification of Letters Patent.
Patented Aug. 1, 19316.
Application filed March 11, 1916. Serial No. 83,462.
To all whom it may concern:
Be it known that I, JOSEPH L. LEE, a citi' zen of the United States, residing at Garbondale, in the county of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Screens, of which the following is a specification, reference being had to the accompanying drawings.
This invention relates to sectional screens for sifting coal and other substances.
The objects accomplished are the production of enlarged screening surface without increasing the size of the screen, combined with greater stiffness and efficiency of the screen.
The particular features of the invention will be further described hereinafter.
The drawings show my improved sections and screen constructed therefrom.
Figure 1 is a perspective view of a screen plate or section. Fig. 2 is a top view of screen comprising several plates or sections secured together. Fig. 8 is a sectional side view through the line w-m of Fig. 2. Fig. 4c shows a screen made up of sections provided with widening slots instead of circular perforations, and Fig. 5 shows a side view of the screen constructed with spacing washers between the plates.
In the drawings A represents my improved form and construction of screen plates or sections which are each made up separately, and may be secured together to form a screen of the desired dimensions. These plates or sections are made of sheet metal of any desired thickness and may be of various dimensions. The length of the individual plate is usually the width of a screen made up of several plates. Each plate has a main body portion which has perforations or openings a, a distributed over it and plain marginal edges 2), 6 g, g, which are provided with small holes z', i, to facilitate its being bolted or riveted to an adjoining plate or to a frame. The holes 2', in the margins Z) and Z2 are made so they will register one over the other when two plates are superimposed for the purpose of be1ng joined together. Near one of its edges the perforated portion of the plate A is turned under until it forms substantially a semicircle 0, care being taken that the nonperforated portion B forming one margin of the plate, will be flat and even with the perforated face of the main body of the plate above it. By this means the blank margin 6 of the plate is brought underneath its perforated portion and the two margins b and b of the plate will have parallel edges and terminate in the same direction. The diameter of the semi-circle 0, will determine the depth of the lip or height of the upper face of one plate above the adjoining one, upon which it rests, and may be varied to suit the size or style of screen desired.
In making up a screen, of more than one section the plates are laid together so that the straight fiat margin Z2 which is at the termination of the crooked portion, or semicircle, and located under one plate, rests on the straight fiat margin 6 of an adjoining plate. Rivets or bolts it, it, may then be passed through the registering holes 2', z, in the edges of both plates, and they are firmly joined together. The perforations in the section A, extend around the bent portion or lip 0, of the plate, so as to overlap the point of joining the plates and meet up with the perforations of the adjoining plate, thereby obtaining a sectional screen with the same sifting surface as a continuous, or one piece screen would have. By making the plate A, curved near the joining margin, as shown at c, and extending this form across the face of the screen, I obtain a series of corrugations or ribs, when a screen is made up of such plates, which greatly stiffens the struc ture and prevents it from-sagging at the center with the weight of the material passing over it. It will also be observed that the material being screened when it reaches the bent portion, or lip 0, will be turned or tumbled in passing to the face of the next plate or section, which increases the elii- I usually are longer in one direction than the other and then used lengthwise across the screen. The plates are adapted for the construction of screens to be used either as a shaking or stationary screen. In case of use in the form of a shaking screen it may be bolted on a frame which is given a reciprocating motion by cranks or eccentrics. When used as a stationary screen it should be made with the lip part of the sections downward and given sufficient incline to cause the material being screened to readily run over it. In screening coal it is sometimes desirable to provide for the separation of pieces of slate from the coal. The slate comes usually in flat pieces while the coal is generally in roundish lumps. For use in such cases the plates are joined together in the manner shown in Fig. 5. v
In this construction I interpose between the plates spacing washers w, to, so the plates are separated a certain distance, and a transverse opening or slot is formed under the bent portion and a little to the rear of the face of the lip 0. The bolts or rivets h, k, pass through the washers and the plates, securing them both in position. When the screen is shaken or given a sidewise motion a considerable amount of fiat pieces of slate will pass through these openings between the plat'es. The perforations or holes in the plates may be of any desired shape, round, square or oblong.
In Fig. 4, I have shown the use of elongated lateral perforations m which are made to gradually widen as they approach the lip at the discharge end. This form of perforation is designed to prevent the material from clogging the screen. The slotted perforations extend over the face of the lip of the section and are preferably staggered, so the narrow ends of the slots in one plate will extend under the lip of the upper adjoining plate and terminate between the wider ends of its slots."
g It will be understood that although I have shown the plate bent into the form of a semi-circle the material advantage to be secured is in having the meeting edge, or margin 6 of the plate, bent in under the perforated body of the section and alined so it will be in position to rest upon, and readily fastened to the margin of an adjoinlng plate or section. The margin 5 will be located on a plane sufliciently below the perforated body portion to allow of the rivets h, 72 being placed in position. 'I have found the bend or crook of a semi-circle a preferable form, as it houses the lower portion of the lip or step under its upper portion and causes the metal to recede from the projected face of the lip out of the way of the material being sifted which produces a better tumbling action of the material at this point. This form of bend also naturally brings the lower margin of the plate into a reversed position alined and ready to besuperimposed on the edge of an adjacent plate; but other forms of crook or bend may be used without departing from the spirit of my invention.
Having described my invention, what I claim as new and desire to secure by Letters Patent is: i
1. A rectangular screen plate with a perforated body portion, a marginal edge along one of its sides which is on the same plane as the perforated body portion, the opposite side of said section having its perforated portion bent into a semi-circle and terminat ing in a marginal edge adapted to besuperimposed upon and secured to the marginal edge of an adjoining duplicate section substantially as shown and described.
2. A rectangular screen plate having a perforated body portion, a marginal edge along its upper side on the same plane as the body portion, the lower perforated part of said plate being crooked. under the body portion and terminating in a reversed marginal edge extending. under the perforated main portion, which is alined with the upper marginal edge and adapted to be superimposed upon and secured to the upper edge of a duplicate plate, substantially as and for the purposes shown and described.
8. A rectangular screen plate having a fiat perforated body portion, a marginal edge along one side thereof on the same plane as said perforated body portion, a transverse curved portion along its opposite side terminating in a reversed marginal edge on a lower plane than the main body and alined parallel with the said fiat marginal edge, substantially as and for the purposes shown and described.
4. A coal screen of the class described comprising two or more rectangular perforated sheet metal sections, the lower border portion of each section being bent back in a curve under the main perforated body portion thereof and terminating in a marginal edge which rests uponv and is bolted to a marginal edge of a continuing section, said curved border portion of sec-' tion extending across the face of the screen and forming a stiffening corrugation substantially as shown and described.
5. A screencomprising two or more rectangular perforated plates joined together along their edges and having spacing of the plates, substantially as described, and washers and slots between the edges, where spacing washers with openings between the 10 the sections are superimposed, substanplates where their edges are superimposed tially as shown and described. substantially as shown and described. 5 6. A screen comprising two or more rec- JOSEPH L. LEE.
tangular perforated sectional plates joined l/Vitnesses: together at their edges having transverse JOHN MATTHEWS, raised lip formation in front of the junction C. D. BARLOW.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,
. Washington, D. 0.